AddressSanitizer.cpp revision 4684858624d7ffe82379783e9b678227d5e0b515
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" 19b5b86d263a651566cb25c0f406f75ceffb771029Kostya Serebryany#include "BlackList.h" 20800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany#include "llvm/ADT/ArrayRef.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" 28d04a8d4b33ff316ca4cf961e06c9e312eff8e64fChandler Carruth#include "llvm/DataLayout.h" 291afbb517965e29b07cb42e2335d5eadd87de6535Alexey Samsonov#include "llvm/DIBuilder.h" 30d04a8d4b33ff316ca4cf961e06c9e312eff8e64fChandler Carruth#include "llvm/Function.h" 31d04a8d4b33ff316ca4cf961e06c9e312eff8e64fChandler Carruth#include "llvm/IRBuilder.h" 32d04a8d4b33ff316ca4cf961e06c9e312eff8e64fChandler Carruth#include "llvm/InlineAsm.h" 3359cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov#include "llvm/InstVisitor.h" 34d04a8d4b33ff316ca4cf961e06c9e312eff8e64fChandler Carruth#include "llvm/IntrinsicInst.h" 35d04a8d4b33ff316ca4cf961e06c9e312eff8e64fChandler Carruth#include "llvm/LLVMContext.h" 36d04a8d4b33ff316ca4cf961e06c9e312eff8e64fChandler Carruth#include "llvm/Module.h" 37800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany#include "llvm/Support/CommandLine.h" 38800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany#include "llvm/Support/DataTypes.h" 39800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany#include "llvm/Support/Debug.h" 40800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany#include "llvm/Support/raw_ostream.h" 41800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany#include "llvm/Support/system_error.h" 42800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany#include "llvm/Target/TargetMachine.h" 43800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany#include "llvm/Transforms/Utils/BasicBlockUtils.h" 441afbb517965e29b07cb42e2335d5eadd87de6535Alexey Samsonov#include "llvm/Transforms/Utils/Local.h" 45800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany#include "llvm/Transforms/Utils/ModuleUtils.h" 46d04a8d4b33ff316ca4cf961e06c9e312eff8e64fChandler Carruth#include "llvm/Type.h" 47800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany#include <algorithm> 48d04a8d4b33ff316ca4cf961e06c9e312eff8e64fChandler Carruth#include <string> 49800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 50800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanyusing namespace llvm; 51800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 52800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystatic const uint64_t kDefaultShadowScale = 3; 53800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystatic const uint64_t kDefaultShadowOffset32 = 1ULL << 29; 54800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystatic const uint64_t kDefaultShadowOffset64 = 1ULL << 44; 5506fdbaa9145f01a291d4981ca5120b7bdcad44c6Evgeniy Stepanovstatic const uint64_t kDefaultShadowOffsetAndroid = 0; 56800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 57800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystatic const size_t kMaxStackMallocSize = 1 << 16; // 64K 58800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystatic const uintptr_t kCurrentStackFrameMagic = 0x41B58AB3; 59800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystatic const uintptr_t kRetiredStackFrameMagic = 0x45E0360E; 60800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 61800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystatic const char *kAsanModuleCtorName = "asan.module_ctor"; 627bcfc9950bac0f411f9671e8d6ce483bd219727eKostya Serebryanystatic const char *kAsanModuleDtorName = "asan.module_dtor"; 637bcfc9950bac0f411f9671e8d6ce483bd219727eKostya Serebryanystatic const int kAsanCtorAndCtorPriority = 1; 64800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystatic const char *kAsanReportErrorTemplate = "__asan_report_"; 65800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystatic const char *kAsanRegisterGlobalsName = "__asan_register_globals"; 667bcfc9950bac0f411f9671e8d6ce483bd219727eKostya Serebryanystatic const char *kAsanUnregisterGlobalsName = "__asan_unregister_globals"; 679b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryanystatic const char *kAsanPoisonGlobalsName = "__asan_before_dynamic_init"; 689b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryanystatic const char *kAsanUnpoisonGlobalsName = "__asan_after_dynamic_init"; 69800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystatic const char *kAsanInitName = "__asan_init"; 7095e3cf44a9d4672655dee3bd558bfeefa631dd55Kostya Serebryanystatic const char *kAsanHandleNoReturnName = "__asan_handle_no_return"; 71800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystatic const char *kAsanMappingOffsetName = "__asan_mapping_offset"; 72800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystatic const char *kAsanMappingScaleName = "__asan_mapping_scale"; 73800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystatic const char *kAsanStackMallocName = "__asan_stack_malloc"; 74800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystatic const char *kAsanStackFreeName = "__asan_stack_free"; 7551c7c65e32f76ec5a50cdecfe2b4c287c57da127Kostya Serebryanystatic const char *kAsanGenPrefix = "__asan_gen_"; 76f985f44b13681071e585acb7a5703a2c1c23b6ceAlexey Samsonovstatic const char *kAsanPoisonStackMemoryName = "__asan_poison_stack_memory"; 77f985f44b13681071e585acb7a5703a2c1c23b6ceAlexey Samsonovstatic const char *kAsanUnpoisonStackMemoryName = 78f985f44b13681071e585acb7a5703a2c1c23b6ceAlexey Samsonov "__asan_unpoison_stack_memory"; 79800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 80800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystatic const int kAsanStackLeftRedzoneMagic = 0xf1; 81800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystatic const int kAsanStackMidRedzoneMagic = 0xf2; 82800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystatic const int kAsanStackRightRedzoneMagic = 0xf3; 83800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystatic const int kAsanStackPartialRedzoneMagic = 0xf4; 84800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 85c0ed3e548c6f688e22685de04e210c7b59ac3433Kostya Serebryany// Accesses sizes are powers of two: 1, 2, 4, 8, 16. 86c0ed3e548c6f688e22685de04e210c7b59ac3433Kostya Serebryanystatic const size_t kNumberOfAccessSizes = 5; 87c0ed3e548c6f688e22685de04e210c7b59ac3433Kostya Serebryany 88800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// Command-line flags. 89800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 90800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// This flag may need to be replaced with -f[no-]asan-reads. 91800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystatic cl::opt<bool> ClInstrumentReads("asan-instrument-reads", 92800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany cl::desc("instrument read instructions"), cl::Hidden, cl::init(true)); 93800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystatic cl::opt<bool> ClInstrumentWrites("asan-instrument-writes", 94800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany cl::desc("instrument write instructions"), cl::Hidden, cl::init(true)); 95e6cf2e0bd09544eeb69665deb908d264e62a71c2Kostya Serebryanystatic cl::opt<bool> ClInstrumentAtomics("asan-instrument-atomics", 96e6cf2e0bd09544eeb69665deb908d264e62a71c2Kostya Serebryany cl::desc("instrument atomic instructions (rmw, cmpxchg)"), 97e6cf2e0bd09544eeb69665deb908d264e62a71c2Kostya Serebryany cl::Hidden, cl::init(true)); 986e2d506dc962873a0e05092bbb034f9a615d1084Kostya Serebryanystatic cl::opt<bool> ClAlwaysSlowPath("asan-always-slow-path", 996e2d506dc962873a0e05092bbb034f9a615d1084Kostya Serebryany cl::desc("use instrumentation with slow path for all accesses"), 1006e2d506dc962873a0e05092bbb034f9a615d1084Kostya Serebryany cl::Hidden, cl::init(false)); 101c0ed3e548c6f688e22685de04e210c7b59ac3433Kostya Serebryany// This flag limits the number of instructions to be instrumented 102324cbb89f2759fb9ad347bd2af4631e50c39c8f3Kostya Serebryany// in any given BB. Normally, this should be set to unlimited (INT_MAX), 103324cbb89f2759fb9ad347bd2af4631e50c39c8f3Kostya Serebryany// but due to http://llvm.org/bugs/show_bug.cgi?id=12652 we temporary 104324cbb89f2759fb9ad347bd2af4631e50c39c8f3Kostya Serebryany// set it to 10000. 105324cbb89f2759fb9ad347bd2af4631e50c39c8f3Kostya Serebryanystatic cl::opt<int> ClMaxInsnsToInstrumentPerBB("asan-max-ins-per-bb", 106324cbb89f2759fb9ad347bd2af4631e50c39c8f3Kostya Serebryany cl::init(10000), 107324cbb89f2759fb9ad347bd2af4631e50c39c8f3Kostya Serebryany cl::desc("maximal number of instructions to instrument in any given BB"), 108324cbb89f2759fb9ad347bd2af4631e50c39c8f3Kostya Serebryany cl::Hidden); 109800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// This flag may need to be replaced with -f[no]asan-stack. 110800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystatic cl::opt<bool> ClStack("asan-stack", 111800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany cl::desc("Handle stack memory"), cl::Hidden, cl::init(true)); 112800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// This flag may need to be replaced with -f[no]asan-use-after-return. 113800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystatic cl::opt<bool> ClUseAfterReturn("asan-use-after-return", 114800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany cl::desc("Check return-after-free"), cl::Hidden, cl::init(false)); 115800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// This flag may need to be replaced with -f[no]asan-globals. 116800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystatic cl::opt<bool> ClGlobals("asan-globals", 117800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany cl::desc("Handle global objects"), cl::Hidden, cl::init(true)); 1189b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryanystatic cl::opt<bool> ClInitializers("asan-initialization-order", 1199b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany cl::desc("Handle C++ initializer order"), cl::Hidden, cl::init(false)); 120800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystatic cl::opt<bool> ClMemIntrin("asan-memintrin", 121800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany cl::desc("Handle memset/memcpy/memmove"), cl::Hidden, cl::init(true)); 1226c55412ea4b39103a3a5764d49ddfdf50e066d56Kostya Serebryanystatic cl::opt<bool> ClRealignStack("asan-realign-stack", 1236c55412ea4b39103a3a5764d49ddfdf50e066d56Kostya Serebryany cl::desc("Realign stack to 32"), cl::Hidden, cl::init(true)); 124b0dcf61252e58715a3bea79f4c112572df361c30Alexey Samsonovstatic cl::opt<std::string> ClBlacklistFile("asan-blacklist", 125b0dcf61252e58715a3bea79f4c112572df361c30Alexey Samsonov cl::desc("File containing the list of objects to ignore " 126800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany "during instrumentation"), cl::Hidden); 127800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 128800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// These flags allow to change the shadow mapping. 129800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// The shadow mapping looks like 130800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// Shadow = (Mem >> scale) + (1 << offset_log) 131800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystatic cl::opt<int> ClMappingScale("asan-mapping-scale", 132800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany cl::desc("scale of asan shadow mapping"), cl::Hidden, cl::init(0)); 133800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystatic cl::opt<int> ClMappingOffsetLog("asan-mapping-offset-log", 134800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany cl::desc("offset of asan shadow mapping"), cl::Hidden, cl::init(-1)); 135800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 136800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// Optimization flags. Not user visible, used mostly for testing 137800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// and benchmarking the tool. 138800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystatic cl::opt<bool> ClOpt("asan-opt", 139800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany cl::desc("Optimize instrumentation"), cl::Hidden, cl::init(true)); 140800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystatic cl::opt<bool> ClOptSameTemp("asan-opt-same-temp", 141800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany cl::desc("Instrument the same temp just once"), cl::Hidden, 142800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany cl::init(true)); 143800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystatic cl::opt<bool> ClOptGlobals("asan-opt-globals", 144800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany cl::desc("Don't instrument scalar globals"), cl::Hidden, cl::init(true)); 145800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 146ee548275c63a1eeffda9d3edd2bea04e1dadcc67Alexey Samsonovstatic cl::opt<bool> ClCheckLifetime("asan-check-lifetime", 147ee548275c63a1eeffda9d3edd2bea04e1dadcc67Alexey Samsonov cl::desc("Use llvm.lifetime intrinsics to insert extra checks"), 148ee548275c63a1eeffda9d3edd2bea04e1dadcc67Alexey Samsonov cl::Hidden, cl::init(false)); 149ee548275c63a1eeffda9d3edd2bea04e1dadcc67Alexey Samsonov 150800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// Debug flags. 151800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystatic cl::opt<int> ClDebug("asan-debug", cl::desc("debug"), cl::Hidden, 152800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany cl::init(0)); 153800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystatic cl::opt<int> ClDebugStack("asan-debug-stack", cl::desc("debug stack"), 154800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany cl::Hidden, cl::init(0)); 155800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystatic cl::opt<std::string> ClDebugFunc("asan-debug-func", 156800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany cl::Hidden, cl::desc("Debug func")); 157800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystatic cl::opt<int> ClDebugMin("asan-debug-min", cl::desc("Debug min inst"), 158800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany cl::Hidden, cl::init(-1)); 159800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystatic cl::opt<int> ClDebugMax("asan-debug-max", cl::desc("Debug man inst"), 160800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany cl::Hidden, cl::init(-1)); 161800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 162800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanynamespace { 163ca23d43084c45a7d6f4371d62f45be044650ce38Kostya Serebryany/// A set of dynamically initialized globals extracted from metadata. 164ca23d43084c45a7d6f4371d62f45be044650ce38Kostya Serebryanyclass SetOfDynamicallyInitializedGlobals { 165ca23d43084c45a7d6f4371d62f45be044650ce38Kostya Serebryany public: 166ca23d43084c45a7d6f4371d62f45be044650ce38Kostya Serebryany void Init(Module& M) { 167ca23d43084c45a7d6f4371d62f45be044650ce38Kostya Serebryany // Clang generates metadata identifying all dynamically initialized globals. 168ca23d43084c45a7d6f4371d62f45be044650ce38Kostya Serebryany NamedMDNode *DynamicGlobals = 169ca23d43084c45a7d6f4371d62f45be044650ce38Kostya Serebryany M.getNamedMetadata("llvm.asan.dynamically_initialized_globals"); 170ca23d43084c45a7d6f4371d62f45be044650ce38Kostya Serebryany if (!DynamicGlobals) 171ca23d43084c45a7d6f4371d62f45be044650ce38Kostya Serebryany return; 172ca23d43084c45a7d6f4371d62f45be044650ce38Kostya Serebryany for (int i = 0, n = DynamicGlobals->getNumOperands(); i < n; ++i) { 173ca23d43084c45a7d6f4371d62f45be044650ce38Kostya Serebryany MDNode *MDN = DynamicGlobals->getOperand(i); 174ca23d43084c45a7d6f4371d62f45be044650ce38Kostya Serebryany assert(MDN->getNumOperands() == 1); 175ca23d43084c45a7d6f4371d62f45be044650ce38Kostya Serebryany Value *VG = MDN->getOperand(0); 176ca23d43084c45a7d6f4371d62f45be044650ce38Kostya Serebryany // The optimizer may optimize away a global entirely, in which case we 177ca23d43084c45a7d6f4371d62f45be044650ce38Kostya Serebryany // cannot instrument access to it. 178ca23d43084c45a7d6f4371d62f45be044650ce38Kostya Serebryany if (!VG) 179ca23d43084c45a7d6f4371d62f45be044650ce38Kostya Serebryany continue; 180ca23d43084c45a7d6f4371d62f45be044650ce38Kostya Serebryany DynInitGlobals.insert(cast<GlobalVariable>(VG)); 181ca23d43084c45a7d6f4371d62f45be044650ce38Kostya Serebryany } 182ca23d43084c45a7d6f4371d62f45be044650ce38Kostya Serebryany } 183ca23d43084c45a7d6f4371d62f45be044650ce38Kostya Serebryany bool Contains(GlobalVariable *G) { return DynInitGlobals.count(G) != 0; } 184ca23d43084c45a7d6f4371d62f45be044650ce38Kostya Serebryany private: 185ca23d43084c45a7d6f4371d62f45be044650ce38Kostya Serebryany SmallSet<GlobalValue*, 32> DynInitGlobals; 186ca23d43084c45a7d6f4371d62f45be044650ce38Kostya Serebryany}; 187ca23d43084c45a7d6f4371d62f45be044650ce38Kostya Serebryany 188b9a12ea0fd92bfdb4c6eb5af333648a618f68686Kostya Serebryanystatic int MappingScale() { 189b9a12ea0fd92bfdb4c6eb5af333648a618f68686Kostya Serebryany return ClMappingScale ? ClMappingScale : kDefaultShadowScale; 190b9a12ea0fd92bfdb4c6eb5af333648a618f68686Kostya Serebryany} 191b9a12ea0fd92bfdb4c6eb5af333648a618f68686Kostya Serebryany 192b9a12ea0fd92bfdb4c6eb5af333648a618f68686Kostya Serebryanystatic size_t RedzoneSize() { 193b9a12ea0fd92bfdb4c6eb5af333648a618f68686Kostya Serebryany // Redzone used for stack and globals is at least 32 bytes. 194b9a12ea0fd92bfdb4c6eb5af333648a618f68686Kostya Serebryany // For scales 6 and 7, the redzone has to be 64 and 128 bytes respectively. 195b9a12ea0fd92bfdb4c6eb5af333648a618f68686Kostya Serebryany return std::max(32U, 1U << MappingScale()); 196b9a12ea0fd92bfdb4c6eb5af333648a618f68686Kostya Serebryany} 197ca23d43084c45a7d6f4371d62f45be044650ce38Kostya Serebryany 198800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany/// AddressSanitizer: instrument the code in module to find memory bugs. 199ee4edeccabe1854ee895f52d4ac5588bd5f40c80Kostya Serebryanystruct AddressSanitizer : public FunctionPass { 200ee548275c63a1eeffda9d3edd2bea04e1dadcc67Alexey Samsonov AddressSanitizer(bool CheckInitOrder = false, 201ee548275c63a1eeffda9d3edd2bea04e1dadcc67Alexey Samsonov bool CheckUseAfterReturn = false, 202b0dcf61252e58715a3bea79f4c112572df361c30Alexey Samsonov bool CheckLifetime = false, 203b0dcf61252e58715a3bea79f4c112572df361c30Alexey Samsonov StringRef BlacklistFile = StringRef()) 204ee548275c63a1eeffda9d3edd2bea04e1dadcc67Alexey Samsonov : FunctionPass(ID), 205ee548275c63a1eeffda9d3edd2bea04e1dadcc67Alexey Samsonov CheckInitOrder(CheckInitOrder || ClInitializers), 206ee548275c63a1eeffda9d3edd2bea04e1dadcc67Alexey Samsonov CheckUseAfterReturn(CheckUseAfterReturn || ClUseAfterReturn), 207b0dcf61252e58715a3bea79f4c112572df361c30Alexey Samsonov CheckLifetime(CheckLifetime || ClCheckLifetime), 208b0dcf61252e58715a3bea79f4c112572df361c30Alexey Samsonov BlacklistFile(BlacklistFile.empty() ? ClBlacklistFile 209b0dcf61252e58715a3bea79f4c112572df361c30Alexey Samsonov : BlacklistFile) {} 2101416edc30adbd53b2be863f7f3de56de4a4c9d0aKostya Serebryany virtual const char *getPassName() const { 2111416edc30adbd53b2be863f7f3de56de4a4c9d0aKostya Serebryany return "AddressSanitizerFunctionPass"; 2121416edc30adbd53b2be863f7f3de56de4a4c9d0aKostya Serebryany } 213ee4edeccabe1854ee895f52d4ac5588bd5f40c80Kostya Serebryany void instrumentMop(Instruction *I); 214ee4edeccabe1854ee895f52d4ac5588bd5f40c80Kostya Serebryany void instrumentAddress(Instruction *OrigIns, IRBuilder<> &IRB, 215800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *Addr, uint32_t TypeSize, bool IsWrite); 216c0ed3e548c6f688e22685de04e210c7b59ac3433Kostya Serebryany Value *createSlowPathCmp(IRBuilder<> &IRB, Value *AddrLong, 217c0ed3e548c6f688e22685de04e210c7b59ac3433Kostya Serebryany Value *ShadowValue, uint32_t TypeSize); 218ebd6454929f2ba3b92f61c151eccde0b8b0a8dedKostya Serebryany Instruction *generateCrashCode(Instruction *InsertBefore, Value *Addr, 2192735cf4aa52e31b8d2de90f836c3ad991215e04eKostya Serebryany bool IsWrite, size_t AccessSizeIndex); 220ee4edeccabe1854ee895f52d4ac5588bd5f40c80Kostya Serebryany bool instrumentMemIntrinsic(MemIntrinsic *MI); 221ee4edeccabe1854ee895f52d4ac5588bd5f40c80Kostya Serebryany void instrumentMemIntrinsicParam(Instruction *OrigIns, Value *Addr, 222c0ed3e548c6f688e22685de04e210c7b59ac3433Kostya Serebryany Value *Size, 223800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Instruction *InsertBefore, bool IsWrite); 224800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *memToShadow(Value *Shadow, IRBuilder<> &IRB); 225ee4edeccabe1854ee895f52d4ac5588bd5f40c80Kostya Serebryany bool runOnFunction(Function &F); 2269b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany void createInitializerPoisonCalls(Module &M, 2279b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany Value *FirstAddr, Value *LastAddr); 228a1a8a323f43a95620fc4c6b5aad8d5ff5e5eb590Kostya Serebryany bool maybeInsertAsanInitAtFunctionEntry(Function &F); 229ee4edeccabe1854ee895f52d4ac5588bd5f40c80Kostya Serebryany virtual bool doInitialization(Module &M); 230800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany static char ID; // Pass identification, replacement for typeid 231800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 232800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany private: 2338b390ffbfdd52a23a45a21de99aa1c31f3ce623fKostya Serebryany void initializeCallbacks(Module &M); 234800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 2359b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany bool ShouldInstrumentGlobal(GlobalVariable *G); 2365a3a9c937198084498a196dae856ac5a5a005bccKostya Serebryany bool LooksLikeCodeInBug11395(Instruction *I); 2379b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany void FindDynamicInitializers(Module &M); 238800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 239ee548275c63a1eeffda9d3edd2bea04e1dadcc67Alexey Samsonov bool CheckInitOrder; 240ee548275c63a1eeffda9d3edd2bea04e1dadcc67Alexey Samsonov bool CheckUseAfterReturn; 241ee548275c63a1eeffda9d3edd2bea04e1dadcc67Alexey Samsonov bool CheckLifetime; 242800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany LLVMContext *C; 2433574eca1b02600bac4e625297f4ecf745f4c4f32Micah Villmow DataLayout *TD; 244800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany uint64_t MappingOffset; 245800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany int LongSize; 246800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Type *IntptrTy; 247800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Function *AsanCtorFunction; 248800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Function *AsanInitFunction; 249ee4edeccabe1854ee895f52d4ac5588bd5f40c80Kostya Serebryany Function *AsanHandleNoReturnFunc; 250b0dcf61252e58715a3bea79f4c112572df361c30Alexey Samsonov SmallString<64> BlacklistFile; 251b5b86d263a651566cb25c0f406f75ceffb771029Kostya Serebryany OwningPtr<BlackList> BL; 2529db5b5ffa9fccd5c7f1f39a3e9aa66cc4a5eedc1Kostya Serebryany // This array is indexed by AccessIsWrite and log2(AccessSize). 2539db5b5ffa9fccd5c7f1f39a3e9aa66cc4a5eedc1Kostya Serebryany Function *AsanErrorCallback[2][kNumberOfAccessSizes]; 254f7b08226eb44458f6f38cbeaca527028803c725aKostya Serebryany InlineAsm *EmptyAsm; 255ca23d43084c45a7d6f4371d62f45be044650ce38Kostya Serebryany SetOfDynamicallyInitializedGlobals DynamicallyInitializedGlobals; 25659cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov 25759cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov friend struct FunctionStackPoisoner; 258800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany}; 259c0ed3e548c6f688e22685de04e210c7b59ac3433Kostya Serebryany 2601416edc30adbd53b2be863f7f3de56de4a4c9d0aKostya Serebryanyclass AddressSanitizerModule : public ModulePass { 261b9a12ea0fd92bfdb4c6eb5af333648a618f68686Kostya Serebryany public: 262b0dcf61252e58715a3bea79f4c112572df361c30Alexey Samsonov AddressSanitizerModule(bool CheckInitOrder = false, 263b0dcf61252e58715a3bea79f4c112572df361c30Alexey Samsonov StringRef BlacklistFile = StringRef()) 264ee548275c63a1eeffda9d3edd2bea04e1dadcc67Alexey Samsonov : ModulePass(ID), 265b0dcf61252e58715a3bea79f4c112572df361c30Alexey Samsonov CheckInitOrder(CheckInitOrder || ClInitializers), 266b0dcf61252e58715a3bea79f4c112572df361c30Alexey Samsonov BlacklistFile(BlacklistFile.empty() ? ClBlacklistFile 267b0dcf61252e58715a3bea79f4c112572df361c30Alexey Samsonov : BlacklistFile) {} 2681416edc30adbd53b2be863f7f3de56de4a4c9d0aKostya Serebryany bool runOnModule(Module &M); 2691416edc30adbd53b2be863f7f3de56de4a4c9d0aKostya Serebryany static char ID; // Pass identification, replacement for typeid 2701416edc30adbd53b2be863f7f3de56de4a4c9d0aKostya Serebryany virtual const char *getPassName() const { 2711416edc30adbd53b2be863f7f3de56de4a4c9d0aKostya Serebryany return "AddressSanitizerModule"; 2721416edc30adbd53b2be863f7f3de56de4a4c9d0aKostya Serebryany } 273f985f44b13681071e585acb7a5703a2c1c23b6ceAlexey Samsonov 274b9a12ea0fd92bfdb4c6eb5af333648a618f68686Kostya Serebryany private: 2754684858624d7ffe82379783e9b678227d5e0b515Alexey Samsonov void initializeCallbacks(Module &M); 2764684858624d7ffe82379783e9b678227d5e0b515Alexey Samsonov 277b9a12ea0fd92bfdb4c6eb5af333648a618f68686Kostya Serebryany bool ShouldInstrumentGlobal(GlobalVariable *G); 278b9a12ea0fd92bfdb4c6eb5af333648a618f68686Kostya Serebryany void createInitializerPoisonCalls(Module &M, Value *FirstAddr, 279b9a12ea0fd92bfdb4c6eb5af333648a618f68686Kostya Serebryany Value *LastAddr); 280b9a12ea0fd92bfdb4c6eb5af333648a618f68686Kostya Serebryany 281ee548275c63a1eeffda9d3edd2bea04e1dadcc67Alexey Samsonov bool CheckInitOrder; 282b0dcf61252e58715a3bea79f4c112572df361c30Alexey Samsonov SmallString<64> BlacklistFile; 283b9a12ea0fd92bfdb4c6eb5af333648a618f68686Kostya Serebryany OwningPtr<BlackList> BL; 284b9a12ea0fd92bfdb4c6eb5af333648a618f68686Kostya Serebryany SetOfDynamicallyInitializedGlobals DynamicallyInitializedGlobals; 285b9a12ea0fd92bfdb4c6eb5af333648a618f68686Kostya Serebryany Type *IntptrTy; 286b9a12ea0fd92bfdb4c6eb5af333648a618f68686Kostya Serebryany LLVMContext *C; 2871416edc30adbd53b2be863f7f3de56de4a4c9d0aKostya Serebryany DataLayout *TD; 2884684858624d7ffe82379783e9b678227d5e0b515Alexey Samsonov Function *AsanPoisonGlobals; 2894684858624d7ffe82379783e9b678227d5e0b515Alexey Samsonov Function *AsanUnpoisonGlobals; 2904684858624d7ffe82379783e9b678227d5e0b515Alexey Samsonov Function *AsanRegisterGlobals; 2914684858624d7ffe82379783e9b678227d5e0b515Alexey Samsonov Function *AsanUnregisterGlobals; 292b9a12ea0fd92bfdb4c6eb5af333648a618f68686Kostya Serebryany}; 293b9a12ea0fd92bfdb4c6eb5af333648a618f68686Kostya Serebryany 29459cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov// Stack poisoning does not play well with exception handling. 29559cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov// When an exception is thrown, we essentially bypass the code 29659cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov// that unpoisones the stack. This is why the run-time library has 29759cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov// to intercept __cxa_throw (as well as longjmp, etc) and unpoison the entire 29859cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov// stack in the interceptor. This however does not work inside the 29959cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov// actual function which catches the exception. Most likely because the 30059cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov// compiler hoists the load of the shadow value somewhere too high. 30159cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov// This causes asan to report a non-existing bug on 453.povray. 30259cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov// It sounds like an LLVM bug. 30359cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonovstruct FunctionStackPoisoner : public InstVisitor<FunctionStackPoisoner> { 30459cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov Function &F; 30559cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov AddressSanitizer &ASan; 30659cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov DIBuilder DIB; 30759cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov LLVMContext *C; 30859cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov Type *IntptrTy; 30959cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov Type *IntptrPtrTy; 31059cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov 31159cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov SmallVector<AllocaInst*, 16> AllocaVec; 31259cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov SmallVector<Instruction*, 8> RetVec; 31359cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov uint64_t TotalStackSize; 31459cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov unsigned StackAlignment; 31559cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov 31659cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov Function *AsanStackMallocFunc, *AsanStackFreeFunc; 31759cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov Function *AsanPoisonStackMemoryFunc, *AsanUnpoisonStackMemoryFunc; 31859cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov 31959cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov FunctionStackPoisoner(Function &F, AddressSanitizer &ASan) 32059cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov : F(F), ASan(ASan), DIB(*F.getParent()), C(ASan.C), 32159cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov IntptrTy(ASan.IntptrTy), IntptrPtrTy(PointerType::get(IntptrTy, 0)), 32259cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov TotalStackSize(0), StackAlignment(1 << MappingScale()) {} 32359cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov 32459cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov bool runOnFunction() { 32559cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov if (!ClStack) return false; 32659cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov // Collect alloca, ret, lifetime instructions etc. 32759cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov for (df_iterator<BasicBlock*> DI = df_begin(&F.getEntryBlock()), 32859cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov DE = df_end(&F.getEntryBlock()); DI != DE; ++DI) { 32959cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov BasicBlock *BB = *DI; 33059cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov visit(*BB); 33159cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov } 33259cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov if (AllocaVec.empty()) return false; 33359cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov 33459cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov initializeCallbacks(*F.getParent()); 33559cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov 33659cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov poisonStack(); 33759cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov 33859cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov if (ClDebugStack) { 33959cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov DEBUG(dbgs() << F); 34059cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov } 34159cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov return true; 34259cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov } 34359cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov 34459cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov // Finds all static Alloca instructions and puts 34559cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov // poisoned red zones around all of them. 34659cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov // Then unpoison everything back before the function returns. 34759cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov void poisonStack(); 34859cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov 34959cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov // ----------------------- Visitors. 35059cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov /// \brief Collect all Ret instructions. 35159cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov void visitReturnInst(ReturnInst &RI) { 35259cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov RetVec.push_back(&RI); 35359cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov } 35459cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov 35559cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov /// \brief Collect Alloca instructions we want (and can) handle. 35659cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov void visitAllocaInst(AllocaInst &AI) { 35759cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov if (AI.isArrayAllocation()) return; 35859cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov if (!AI.isStaticAlloca()) return; 35959cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov if (!AI.getAllocatedType()->isSized()) return; 36059cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov 36159cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov StackAlignment = std::max(StackAlignment, AI.getAlignment()); 36259cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov AllocaVec.push_back(&AI); 36359cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov uint64_t AlignedSize = getAlignedAllocaSize(&AI); 36459cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov TotalStackSize += AlignedSize; 36559cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov } 36659cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov 36759cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov // ---------------------- Helpers. 36859cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov void initializeCallbacks(Module &M); 36959cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov 37059cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov uint64_t getAllocaSizeInBytes(AllocaInst *AI) { 37159cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov Type *Ty = AI->getAllocatedType(); 37259cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov uint64_t SizeInBytes = ASan.TD->getTypeAllocSize(Ty); 37359cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov return SizeInBytes; 37459cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov } 37559cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov uint64_t getAlignedSize(uint64_t SizeInBytes) { 37659cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov size_t RZ = RedzoneSize(); 37759cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov return ((SizeInBytes + RZ - 1) / RZ) * RZ; 37859cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov } 37959cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov uint64_t getAlignedAllocaSize(AllocaInst *AI) { 38059cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov uint64_t SizeInBytes = getAllocaSizeInBytes(AI); 38159cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov return getAlignedSize(SizeInBytes); 38259cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov } 38359cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov void poisonRedZones(const ArrayRef<AllocaInst*> &AllocaVec, IRBuilder<> IRB, 38459cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov Value *ShadowBase, bool DoPoison); 38559cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov void poisonAlloca(Value *V, uint64_t Size, IRBuilder<> IRB, bool DoPoison); 38659cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov /// Analyze lifetime intrinsics for given alloca. Use Value* instead of 38759cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov /// AllocaInst* here, as we call this method after we merge all allocas into a 38859cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov /// single one. Returns true if ASan added some instrumentation. 38959cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov bool handleAllocaLifetime(Value *Alloca); 39059cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov /// Analyze lifetime intrinsics for a specific value, casted from alloca. 39159cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov /// Returns true if if ASan added some instrumentation. 39259cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov bool handleValueLifetime(Value *V); 39359cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov}; 39459cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov 395800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany} // namespace 396800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 397800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanychar AddressSanitizer::ID = 0; 398800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya SerebryanyINITIALIZE_PASS(AddressSanitizer, "asan", 399800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany "AddressSanitizer: detects use-after-free and out-of-bounds bugs.", 400800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany false, false) 401ee548275c63a1eeffda9d3edd2bea04e1dadcc67Alexey SamsonovFunctionPass *llvm::createAddressSanitizerFunctionPass( 402b0dcf61252e58715a3bea79f4c112572df361c30Alexey Samsonov bool CheckInitOrder, bool CheckUseAfterReturn, bool CheckLifetime, 403b0dcf61252e58715a3bea79f4c112572df361c30Alexey Samsonov StringRef BlacklistFile) { 404ee548275c63a1eeffda9d3edd2bea04e1dadcc67Alexey Samsonov return new AddressSanitizer(CheckInitOrder, CheckUseAfterReturn, 405b0dcf61252e58715a3bea79f4c112572df361c30Alexey Samsonov CheckLifetime, BlacklistFile); 406800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany} 407800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 4081416edc30adbd53b2be863f7f3de56de4a4c9d0aKostya Serebryanychar AddressSanitizerModule::ID = 0; 4091416edc30adbd53b2be863f7f3de56de4a4c9d0aKostya SerebryanyINITIALIZE_PASS(AddressSanitizerModule, "asan-module", 4101416edc30adbd53b2be863f7f3de56de4a4c9d0aKostya Serebryany "AddressSanitizer: detects use-after-free and out-of-bounds bugs." 4111416edc30adbd53b2be863f7f3de56de4a4c9d0aKostya Serebryany "ModulePass", false, false) 412b0dcf61252e58715a3bea79f4c112572df361c30Alexey SamsonovModulePass *llvm::createAddressSanitizerModulePass( 413b0dcf61252e58715a3bea79f4c112572df361c30Alexey Samsonov bool CheckInitOrder, StringRef BlacklistFile) { 414b0dcf61252e58715a3bea79f4c112572df361c30Alexey Samsonov return new AddressSanitizerModule(CheckInitOrder, BlacklistFile); 41525878042030e85c244b41bfcdfad27c32360e2ecAlexander Potapenko} 41625878042030e85c244b41bfcdfad27c32360e2ecAlexander Potapenko 4172735cf4aa52e31b8d2de90f836c3ad991215e04eKostya Serebryanystatic size_t TypeSizeToSizeIndex(uint32_t TypeSize) { 4182735cf4aa52e31b8d2de90f836c3ad991215e04eKostya Serebryany size_t Res = CountTrailingZeros_32(TypeSize / 8); 4192735cf4aa52e31b8d2de90f836c3ad991215e04eKostya Serebryany assert(Res < kNumberOfAccessSizes); 4202735cf4aa52e31b8d2de90f836c3ad991215e04eKostya Serebryany return Res; 4212735cf4aa52e31b8d2de90f836c3ad991215e04eKostya Serebryany} 4222735cf4aa52e31b8d2de90f836c3ad991215e04eKostya Serebryany 423800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// Create a constant for Str so that we can pass it to the run-time lib. 424800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystatic GlobalVariable *createPrivateGlobalForString(Module &M, StringRef Str) { 42518c7f80b3e83ab584bd8572695a3cde8bafd9d3cChris Lattner Constant *StrConst = ConstantDataArray::getString(M.getContext(), Str); 426800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany return new GlobalVariable(M, StrConst->getType(), true, 42751c7c65e32f76ec5a50cdecfe2b4c287c57da127Kostya Serebryany GlobalValue::PrivateLinkage, StrConst, 42851c7c65e32f76ec5a50cdecfe2b4c287c57da127Kostya Serebryany kAsanGenPrefix); 42951c7c65e32f76ec5a50cdecfe2b4c287c57da127Kostya Serebryany} 43051c7c65e32f76ec5a50cdecfe2b4c287c57da127Kostya Serebryany 43151c7c65e32f76ec5a50cdecfe2b4c287c57da127Kostya Serebryanystatic bool GlobalWasGeneratedByAsan(GlobalVariable *G) { 43251c7c65e32f76ec5a50cdecfe2b4c287c57da127Kostya Serebryany return G->getName().find(kAsanGenPrefix) == 0; 433800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany} 434800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 435800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya SerebryanyValue *AddressSanitizer::memToShadow(Value *Shadow, IRBuilder<> &IRB) { 436800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // Shadow >> scale 437b9a12ea0fd92bfdb4c6eb5af333648a618f68686Kostya Serebryany Shadow = IRB.CreateLShr(Shadow, MappingScale()); 438800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (MappingOffset == 0) 439800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany return Shadow; 440800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // (Shadow >> scale) | offset 441800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany return IRB.CreateOr(Shadow, ConstantInt::get(IntptrTy, 442800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany MappingOffset)); 443800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany} 444800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 445c0ed3e548c6f688e22685de04e210c7b59ac3433Kostya Serebryanyvoid AddressSanitizer::instrumentMemIntrinsicParam( 446ee4edeccabe1854ee895f52d4ac5588bd5f40c80Kostya Serebryany Instruction *OrigIns, 447800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *Addr, Value *Size, Instruction *InsertBefore, bool IsWrite) { 448800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // Check the first byte. 449800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany { 450800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany IRBuilder<> IRB(InsertBefore); 451ee4edeccabe1854ee895f52d4ac5588bd5f40c80Kostya Serebryany instrumentAddress(OrigIns, IRB, Addr, 8, IsWrite); 452800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 453800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // Check the last byte. 454800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany { 455800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany IRBuilder<> IRB(InsertBefore); 456800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *SizeMinusOne = IRB.CreateSub( 457800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Size, ConstantInt::get(Size->getType(), 1)); 458800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany SizeMinusOne = IRB.CreateIntCast(SizeMinusOne, IntptrTy, false); 459800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *AddrLong = IRB.CreatePointerCast(Addr, IntptrTy); 460800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *AddrPlusSizeMinisOne = IRB.CreateAdd(AddrLong, SizeMinusOne); 461ee4edeccabe1854ee895f52d4ac5588bd5f40c80Kostya Serebryany instrumentAddress(OrigIns, IRB, AddrPlusSizeMinisOne, 8, IsWrite); 462800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 463800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany} 464800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 465800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// Instrument memset/memmove/memcpy 466ee4edeccabe1854ee895f52d4ac5588bd5f40c80Kostya Serebryanybool AddressSanitizer::instrumentMemIntrinsic(MemIntrinsic *MI) { 467800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *Dst = MI->getDest(); 468800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany MemTransferInst *MemTran = dyn_cast<MemTransferInst>(MI); 4692735cf4aa52e31b8d2de90f836c3ad991215e04eKostya Serebryany Value *Src = MemTran ? MemTran->getSource() : 0; 470800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *Length = MI->getLength(); 471800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 472800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Constant *ConstLength = dyn_cast<Constant>(Length); 473800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Instruction *InsertBefore = MI; 474800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (ConstLength) { 475800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (ConstLength->isNullValue()) return false; 476800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } else { 477800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // The size is not a constant so it could be zero -- check at run-time. 478800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany IRBuilder<> IRB(InsertBefore); 479800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 480800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *Cmp = IRB.CreateICmpNE(Length, 48156139bc493790612ee6281630678e293be6b2eb2Kostya Serebryany Constant::getNullValue(Length->getType())); 4824a2dec05cef5882b745dd248d79e42a42cdbc87bEvgeniy Stepanov InsertBefore = SplitBlockAndInsertIfThen(cast<Instruction>(Cmp), false); 483800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 484800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 485ee4edeccabe1854ee895f52d4ac5588bd5f40c80Kostya Serebryany instrumentMemIntrinsicParam(MI, Dst, Length, InsertBefore, true); 486800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (Src) 487ee4edeccabe1854ee895f52d4ac5588bd5f40c80Kostya Serebryany instrumentMemIntrinsicParam(MI, Src, Length, InsertBefore, false); 488800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany return true; 489800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany} 490800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 491e6cf2e0bd09544eeb69665deb908d264e62a71c2Kostya Serebryany// If I is an interesting memory access, return the PointerOperand 492e6cf2e0bd09544eeb69665deb908d264e62a71c2Kostya Serebryany// and set IsWrite. Otherwise return NULL. 493e6cf2e0bd09544eeb69665deb908d264e62a71c2Kostya Serebryanystatic Value *isInterestingMemoryAccess(Instruction *I, bool *IsWrite) { 494800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (LoadInst *LI = dyn_cast<LoadInst>(I)) { 495e6cf2e0bd09544eeb69665deb908d264e62a71c2Kostya Serebryany if (!ClInstrumentReads) return NULL; 496e6cf2e0bd09544eeb69665deb908d264e62a71c2Kostya Serebryany *IsWrite = false; 497800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany return LI->getPointerOperand(); 498800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 499e6cf2e0bd09544eeb69665deb908d264e62a71c2Kostya Serebryany if (StoreInst *SI = dyn_cast<StoreInst>(I)) { 500e6cf2e0bd09544eeb69665deb908d264e62a71c2Kostya Serebryany if (!ClInstrumentWrites) return NULL; 501e6cf2e0bd09544eeb69665deb908d264e62a71c2Kostya Serebryany *IsWrite = true; 502e6cf2e0bd09544eeb69665deb908d264e62a71c2Kostya Serebryany return SI->getPointerOperand(); 503e6cf2e0bd09544eeb69665deb908d264e62a71c2Kostya Serebryany } 504e6cf2e0bd09544eeb69665deb908d264e62a71c2Kostya Serebryany if (AtomicRMWInst *RMW = dyn_cast<AtomicRMWInst>(I)) { 505e6cf2e0bd09544eeb69665deb908d264e62a71c2Kostya Serebryany if (!ClInstrumentAtomics) return NULL; 506e6cf2e0bd09544eeb69665deb908d264e62a71c2Kostya Serebryany *IsWrite = true; 507e6cf2e0bd09544eeb69665deb908d264e62a71c2Kostya Serebryany return RMW->getPointerOperand(); 508e6cf2e0bd09544eeb69665deb908d264e62a71c2Kostya Serebryany } 509e6cf2e0bd09544eeb69665deb908d264e62a71c2Kostya Serebryany if (AtomicCmpXchgInst *XCHG = dyn_cast<AtomicCmpXchgInst>(I)) { 510e6cf2e0bd09544eeb69665deb908d264e62a71c2Kostya Serebryany if (!ClInstrumentAtomics) return NULL; 511e6cf2e0bd09544eeb69665deb908d264e62a71c2Kostya Serebryany *IsWrite = true; 512e6cf2e0bd09544eeb69665deb908d264e62a71c2Kostya Serebryany return XCHG->getPointerOperand(); 513e6cf2e0bd09544eeb69665deb908d264e62a71c2Kostya Serebryany } 514e6cf2e0bd09544eeb69665deb908d264e62a71c2Kostya Serebryany return NULL; 515800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany} 516800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 517ee4edeccabe1854ee895f52d4ac5588bd5f40c80Kostya Serebryanyvoid AddressSanitizer::instrumentMop(Instruction *I) { 5183780ad8b998d93d7db406919c06137cdb786ef05Axel Naumann bool IsWrite = false; 519e6cf2e0bd09544eeb69665deb908d264e62a71c2Kostya Serebryany Value *Addr = isInterestingMemoryAccess(I, &IsWrite); 520e6cf2e0bd09544eeb69665deb908d264e62a71c2Kostya Serebryany assert(Addr); 5219b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany if (ClOpt && ClOptGlobals) { 5229b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany if (GlobalVariable *G = dyn_cast<GlobalVariable>(Addr)) { 5239b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany // If initialization order checking is disabled, a simple access to a 5249b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany // dynamically initialized global is always valid. 525ee548275c63a1eeffda9d3edd2bea04e1dadcc67Alexey Samsonov if (!CheckInitOrder) 5269b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany return; 5279b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany // If a global variable does not have dynamic initialization we don't 528407790604b8f71f7172bbdfb76c27e1799d241c2Kostya Serebryany // have to instrument it. However, if a global does not have initailizer 529407790604b8f71f7172bbdfb76c27e1799d241c2Kostya Serebryany // at all, we assume it has dynamic initializer (in other TU). 530407790604b8f71f7172bbdfb76c27e1799d241c2Kostya Serebryany if (G->hasInitializer() && !DynamicallyInitializedGlobals.Contains(G)) 5319b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany return; 5329b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany } 533800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 5349b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany 535800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Type *OrigPtrTy = Addr->getType(); 536800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Type *OrigTy = cast<PointerType>(OrigPtrTy)->getElementType(); 537800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 538800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany assert(OrigTy->isSized()); 539800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany uint32_t TypeSize = TD->getTypeStoreSizeInBits(OrigTy); 540800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 541800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (TypeSize != 8 && TypeSize != 16 && 542800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany TypeSize != 32 && TypeSize != 64 && TypeSize != 128) { 543800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // Ignore all unusual sizes. 544800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany return; 545800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 546800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 547800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany IRBuilder<> IRB(I); 548ee4edeccabe1854ee895f52d4ac5588bd5f40c80Kostya Serebryany instrumentAddress(I, IRB, Addr, TypeSize, IsWrite); 549800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany} 550800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 55155cabae685991ac6bc6d96b14e2139f64a0c9967Alexander Potapenko// Validate the result of Module::getOrInsertFunction called for an interface 55255cabae685991ac6bc6d96b14e2139f64a0c9967Alexander Potapenko// function of AddressSanitizer. If the instrumented module defines a function 55355cabae685991ac6bc6d96b14e2139f64a0c9967Alexander Potapenko// with the same name, their prototypes must match, otherwise 55455cabae685991ac6bc6d96b14e2139f64a0c9967Alexander Potapenko// getOrInsertFunction returns a bitcast. 555b9a12ea0fd92bfdb4c6eb5af333648a618f68686Kostya Serebryanystatic Function *checkInterfaceFunction(Constant *FuncOrBitcast) { 55655cabae685991ac6bc6d96b14e2139f64a0c9967Alexander Potapenko if (isa<Function>(FuncOrBitcast)) return cast<Function>(FuncOrBitcast); 55755cabae685991ac6bc6d96b14e2139f64a0c9967Alexander Potapenko FuncOrBitcast->dump(); 55855cabae685991ac6bc6d96b14e2139f64a0c9967Alexander Potapenko report_fatal_error("trying to redefine an AddressSanitizer " 55955cabae685991ac6bc6d96b14e2139f64a0c9967Alexander Potapenko "interface function"); 56055cabae685991ac6bc6d96b14e2139f64a0c9967Alexander Potapenko} 56155cabae685991ac6bc6d96b14e2139f64a0c9967Alexander Potapenko 562800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya SerebryanyInstruction *AddressSanitizer::generateCrashCode( 563ebd6454929f2ba3b92f61c151eccde0b8b0a8dedKostya Serebryany Instruction *InsertBefore, Value *Addr, 5644f0c69623c10a3a49f6926fd53694ee532e06a85Kostya Serebryany bool IsWrite, size_t AccessSizeIndex) { 565ebd6454929f2ba3b92f61c151eccde0b8b0a8dedKostya Serebryany IRBuilder<> IRB(InsertBefore); 566ebd6454929f2ba3b92f61c151eccde0b8b0a8dedKostya Serebryany CallInst *Call = IRB.CreateCall(AsanErrorCallback[IsWrite][AccessSizeIndex], 567ebd6454929f2ba3b92f61c151eccde0b8b0a8dedKostya Serebryany Addr); 568f7b08226eb44458f6f38cbeaca527028803c725aKostya Serebryany // We don't do Call->setDoesNotReturn() because the BB already has 569f7b08226eb44458f6f38cbeaca527028803c725aKostya Serebryany // UnreachableInst at the end. 570f7b08226eb44458f6f38cbeaca527028803c725aKostya Serebryany // This EmptyAsm is required to avoid callback merge. 571f7b08226eb44458f6f38cbeaca527028803c725aKostya Serebryany IRB.CreateCall(EmptyAsm); 5723c7faae346f548c55cad86d82a2e242443001f23Kostya Serebryany return Call; 573800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany} 574800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 5752735cf4aa52e31b8d2de90f836c3ad991215e04eKostya SerebryanyValue *AddressSanitizer::createSlowPathCmp(IRBuilder<> &IRB, Value *AddrLong, 576c0ed3e548c6f688e22685de04e210c7b59ac3433Kostya Serebryany Value *ShadowValue, 577c0ed3e548c6f688e22685de04e210c7b59ac3433Kostya Serebryany uint32_t TypeSize) { 578b9a12ea0fd92bfdb4c6eb5af333648a618f68686Kostya Serebryany size_t Granularity = 1 << MappingScale(); 579c0ed3e548c6f688e22685de04e210c7b59ac3433Kostya Serebryany // Addr & (Granularity - 1) 580c0ed3e548c6f688e22685de04e210c7b59ac3433Kostya Serebryany Value *LastAccessedByte = IRB.CreateAnd( 581c0ed3e548c6f688e22685de04e210c7b59ac3433Kostya Serebryany AddrLong, ConstantInt::get(IntptrTy, Granularity - 1)); 582c0ed3e548c6f688e22685de04e210c7b59ac3433Kostya Serebryany // (Addr & (Granularity - 1)) + size - 1 583c0ed3e548c6f688e22685de04e210c7b59ac3433Kostya Serebryany if (TypeSize / 8 > 1) 584c0ed3e548c6f688e22685de04e210c7b59ac3433Kostya Serebryany LastAccessedByte = IRB.CreateAdd( 585c0ed3e548c6f688e22685de04e210c7b59ac3433Kostya Serebryany LastAccessedByte, ConstantInt::get(IntptrTy, TypeSize / 8 - 1)); 586c0ed3e548c6f688e22685de04e210c7b59ac3433Kostya Serebryany // (uint8_t) ((Addr & (Granularity-1)) + size - 1) 587c0ed3e548c6f688e22685de04e210c7b59ac3433Kostya Serebryany LastAccessedByte = IRB.CreateIntCast( 5886e2d506dc962873a0e05092bbb034f9a615d1084Kostya Serebryany LastAccessedByte, ShadowValue->getType(), false); 589c0ed3e548c6f688e22685de04e210c7b59ac3433Kostya Serebryany // ((uint8_t) ((Addr & (Granularity-1)) + size - 1)) >= ShadowValue 590c0ed3e548c6f688e22685de04e210c7b59ac3433Kostya Serebryany return IRB.CreateICmpSGE(LastAccessedByte, ShadowValue); 591c0ed3e548c6f688e22685de04e210c7b59ac3433Kostya Serebryany} 592c0ed3e548c6f688e22685de04e210c7b59ac3433Kostya Serebryany 593ee4edeccabe1854ee895f52d4ac5588bd5f40c80Kostya Serebryanyvoid AddressSanitizer::instrumentAddress(Instruction *OrigIns, 594800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany IRBuilder<> &IRB, Value *Addr, 595800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany uint32_t TypeSize, bool IsWrite) { 596800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *AddrLong = IRB.CreatePointerCast(Addr, IntptrTy); 597800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 598800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Type *ShadowTy = IntegerType::get( 599b9a12ea0fd92bfdb4c6eb5af333648a618f68686Kostya Serebryany *C, std::max(8U, TypeSize >> MappingScale())); 600800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Type *ShadowPtrTy = PointerType::get(ShadowTy, 0); 601800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *ShadowPtr = memToShadow(AddrLong, IRB); 602800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *CmpVal = Constant::getNullValue(ShadowTy); 603800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *ShadowValue = IRB.CreateLoad( 604800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany IRB.CreateIntToPtr(ShadowPtr, ShadowPtrTy)); 605800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 606800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *Cmp = IRB.CreateICmpNE(ShadowValue, CmpVal); 60711c2a47af825a0f89d75aaa97ad873ed2acef266Kostya Serebryany size_t AccessSizeIndex = TypeSizeToSizeIndex(TypeSize); 608b9a12ea0fd92bfdb4c6eb5af333648a618f68686Kostya Serebryany size_t Granularity = 1 << MappingScale(); 609ebd6454929f2ba3b92f61c151eccde0b8b0a8dedKostya Serebryany TerminatorInst *CrashTerm = 0; 610ebd6454929f2ba3b92f61c151eccde0b8b0a8dedKostya Serebryany 6116e2d506dc962873a0e05092bbb034f9a615d1084Kostya Serebryany if (ClAlwaysSlowPath || (TypeSize < 8 * Granularity)) { 6124a2dec05cef5882b745dd248d79e42a42cdbc87bEvgeniy Stepanov TerminatorInst *CheckTerm = 6134a2dec05cef5882b745dd248d79e42a42cdbc87bEvgeniy Stepanov SplitBlockAndInsertIfThen(cast<Instruction>(Cmp), false); 614ebd6454929f2ba3b92f61c151eccde0b8b0a8dedKostya Serebryany assert(dyn_cast<BranchInst>(CheckTerm)->isUnconditional()); 615f7b08226eb44458f6f38cbeaca527028803c725aKostya Serebryany BasicBlock *NextBB = CheckTerm->getSuccessor(0); 616c0ed3e548c6f688e22685de04e210c7b59ac3433Kostya Serebryany IRB.SetInsertPoint(CheckTerm); 617c0ed3e548c6f688e22685de04e210c7b59ac3433Kostya Serebryany Value *Cmp2 = createSlowPathCmp(IRB, AddrLong, ShadowValue, TypeSize); 618ee4edeccabe1854ee895f52d4ac5588bd5f40c80Kostya Serebryany BasicBlock *CrashBlock = 619ee4edeccabe1854ee895f52d4ac5588bd5f40c80Kostya Serebryany BasicBlock::Create(*C, "", NextBB->getParent(), NextBB); 620ebd6454929f2ba3b92f61c151eccde0b8b0a8dedKostya Serebryany CrashTerm = new UnreachableInst(*C, CrashBlock); 621f7b08226eb44458f6f38cbeaca527028803c725aKostya Serebryany BranchInst *NewTerm = BranchInst::Create(CrashBlock, NextBB, Cmp2); 622f7b08226eb44458f6f38cbeaca527028803c725aKostya Serebryany ReplaceInstWithInst(CheckTerm, NewTerm); 623c0ed3e548c6f688e22685de04e210c7b59ac3433Kostya Serebryany } else { 6244a2dec05cef5882b745dd248d79e42a42cdbc87bEvgeniy Stepanov CrashTerm = SplitBlockAndInsertIfThen(cast<Instruction>(Cmp), true); 625800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 626ebd6454929f2ba3b92f61c151eccde0b8b0a8dedKostya Serebryany 627ebd6454929f2ba3b92f61c151eccde0b8b0a8dedKostya Serebryany Instruction *Crash = 628ebd6454929f2ba3b92f61c151eccde0b8b0a8dedKostya Serebryany generateCrashCode(CrashTerm, AddrLong, IsWrite, AccessSizeIndex); 629ebd6454929f2ba3b92f61c151eccde0b8b0a8dedKostya Serebryany Crash->setDebugLoc(OrigIns->getDebugLoc()); 630800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany} 631800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 6321416edc30adbd53b2be863f7f3de56de4a4c9d0aKostya Serebryanyvoid AddressSanitizerModule::createInitializerPoisonCalls( 633b9a12ea0fd92bfdb4c6eb5af333648a618f68686Kostya Serebryany Module &M, Value *FirstAddr, Value *LastAddr) { 6349b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany // We do all of our poisoning and unpoisoning within _GLOBAL__I_a. 6359b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany Function *GlobalInit = M.getFunction("_GLOBAL__I_a"); 6369b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany // If that function is not present, this TU contains no globals, or they have 6379b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany // all been optimized away 6389b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany if (!GlobalInit) 6399b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany return; 6409b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany 6419b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany // Set up the arguments to our poison/unpoison functions. 6429b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany IRBuilder<> IRB(GlobalInit->begin()->getFirstInsertionPt()); 6439b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany 6449b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany // Add a call to poison all external globals before the given function starts. 6459b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany IRB.CreateCall2(AsanPoisonGlobals, FirstAddr, LastAddr); 6469b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany 6479b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany // Add calls to unpoison all globals before each return instruction. 6489b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany for (Function::iterator I = GlobalInit->begin(), E = GlobalInit->end(); 6499b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany I != E; ++I) { 6509b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany if (ReturnInst *RI = dyn_cast<ReturnInst>(I->getTerminator())) { 6519b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany CallInst::Create(AsanUnpoisonGlobals, "", RI); 6529b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany } 6539b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany } 6549b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany} 6559b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany 6561416edc30adbd53b2be863f7f3de56de4a4c9d0aKostya Serebryanybool AddressSanitizerModule::ShouldInstrumentGlobal(GlobalVariable *G) { 6579b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany Type *Ty = cast<PointerType>(G->getType())->getElementType(); 658324d96b9e265b0fd8bf63a28340910def64e2164Kostya Serebryany DEBUG(dbgs() << "GLOBAL: " << *G << "\n"); 6599b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany 66059a4a47a7bea7cc17877c6a3954ad9f8309ff1cbKostya Serebryany if (BL->isIn(*G)) return false; 6619b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany if (!Ty->isSized()) return false; 6629b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany if (!G->hasInitializer()) return false; 66351c7c65e32f76ec5a50cdecfe2b4c287c57da127Kostya Serebryany if (GlobalWasGeneratedByAsan(G)) return false; // Our own global. 6649b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany // Touch only those globals that will not be defined in other modules. 6659b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany // Don't handle ODR type linkages since other modules may be built w/o asan. 6669b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany if (G->getLinkage() != GlobalVariable::ExternalLinkage && 6679b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany G->getLinkage() != GlobalVariable::PrivateLinkage && 6689b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany G->getLinkage() != GlobalVariable::InternalLinkage) 6699b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany return false; 6709b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany // Two problems with thread-locals: 6719b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany // - The address of the main thread's copy can't be computed at link-time. 6729b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany // - Need to poison all copies, not just the main thread's one. 6739b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany if (G->isThreadLocal()) 6749b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany return false; 6759b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany // For now, just ignore this Alloca if the alignment is large. 676b9a12ea0fd92bfdb4c6eb5af333648a618f68686Kostya Serebryany if (G->getAlignment() > RedzoneSize()) return false; 6779b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany 6789b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany // Ignore all the globals with the names starting with "\01L_OBJC_". 6799b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany // Many of those are put into the .cstring section. The linker compresses 6809b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany // that section by removing the spare \0s after the string terminator, so 6819b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany // our redzones get broken. 6829b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany if ((G->getName().find("\01L_OBJC_") == 0) || 6839b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany (G->getName().find("\01l_OBJC_") == 0)) { 6849b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany DEBUG(dbgs() << "Ignoring \\01L_OBJC_* global: " << *G); 6859b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany return false; 6869b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany } 6879b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany 6889b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany if (G->hasSection()) { 6899b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany StringRef Section(G->getSection()); 6909b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany // Ignore the globals from the __OBJC section. The ObjC runtime assumes 6919b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany // those conform to /usr/lib/objc/runtime.h, so we can't add redzones to 6929b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany // them. 6939b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany if ((Section.find("__OBJC,") == 0) || 6949b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany (Section.find("__DATA, __objc_") == 0)) { 6959b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany DEBUG(dbgs() << "Ignoring ObjC runtime global: " << *G); 6969b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany return false; 6979b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany } 6989b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany // See http://code.google.com/p/address-sanitizer/issues/detail?id=32 6999b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany // Constant CFString instances are compiled in the following way: 7009b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany // -- the string buffer is emitted into 7019b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany // __TEXT,__cstring,cstring_literals 7029b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany // -- the constant NSConstantString structure referencing that buffer 7039b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany // is placed into __DATA,__cfstring 7049b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany // Therefore there's no point in placing redzones into __DATA,__cfstring. 7059b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany // Moreover, it causes the linker to crash on OS X 10.7 7069b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany if (Section.find("__DATA,__cfstring") == 0) { 7079b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany DEBUG(dbgs() << "Ignoring CFString: " << *G); 7089b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany return false; 7099b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany } 7109b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany } 7119b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany 7129b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany return true; 7139b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany} 7149b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany 7154684858624d7ffe82379783e9b678227d5e0b515Alexey Samsonovvoid AddressSanitizerModule::initializeCallbacks(Module &M) { 7164684858624d7ffe82379783e9b678227d5e0b515Alexey Samsonov IRBuilder<> IRB(*C); 7174684858624d7ffe82379783e9b678227d5e0b515Alexey Samsonov // Declare our poisoning and unpoisoning functions. 7184684858624d7ffe82379783e9b678227d5e0b515Alexey Samsonov AsanPoisonGlobals = checkInterfaceFunction(M.getOrInsertFunction( 7194684858624d7ffe82379783e9b678227d5e0b515Alexey Samsonov kAsanPoisonGlobalsName, IRB.getVoidTy(), IntptrTy, IntptrTy, NULL)); 7204684858624d7ffe82379783e9b678227d5e0b515Alexey Samsonov AsanPoisonGlobals->setLinkage(Function::ExternalLinkage); 7214684858624d7ffe82379783e9b678227d5e0b515Alexey Samsonov AsanUnpoisonGlobals = checkInterfaceFunction(M.getOrInsertFunction( 7224684858624d7ffe82379783e9b678227d5e0b515Alexey Samsonov kAsanUnpoisonGlobalsName, IRB.getVoidTy(), NULL)); 7234684858624d7ffe82379783e9b678227d5e0b515Alexey Samsonov AsanUnpoisonGlobals->setLinkage(Function::ExternalLinkage); 7244684858624d7ffe82379783e9b678227d5e0b515Alexey Samsonov // Declare functions that register/unregister globals. 7254684858624d7ffe82379783e9b678227d5e0b515Alexey Samsonov AsanRegisterGlobals = checkInterfaceFunction(M.getOrInsertFunction( 7264684858624d7ffe82379783e9b678227d5e0b515Alexey Samsonov kAsanRegisterGlobalsName, IRB.getVoidTy(), 7274684858624d7ffe82379783e9b678227d5e0b515Alexey Samsonov IntptrTy, IntptrTy, NULL)); 7284684858624d7ffe82379783e9b678227d5e0b515Alexey Samsonov AsanRegisterGlobals->setLinkage(Function::ExternalLinkage); 7294684858624d7ffe82379783e9b678227d5e0b515Alexey Samsonov AsanUnregisterGlobals = checkInterfaceFunction(M.getOrInsertFunction( 7304684858624d7ffe82379783e9b678227d5e0b515Alexey Samsonov kAsanUnregisterGlobalsName, 7314684858624d7ffe82379783e9b678227d5e0b515Alexey Samsonov IRB.getVoidTy(), IntptrTy, IntptrTy, NULL)); 7324684858624d7ffe82379783e9b678227d5e0b515Alexey Samsonov AsanUnregisterGlobals->setLinkage(Function::ExternalLinkage); 7334684858624d7ffe82379783e9b678227d5e0b515Alexey Samsonov} 7344684858624d7ffe82379783e9b678227d5e0b515Alexey Samsonov 735800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// This function replaces all global variables with new variables that have 736800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// trailing redzones. It also creates a function that poisons 737800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// redzones and inserts this function into llvm.global_ctors. 7381416edc30adbd53b2be863f7f3de56de4a4c9d0aKostya Serebryanybool AddressSanitizerModule::runOnModule(Module &M) { 7391416edc30adbd53b2be863f7f3de56de4a4c9d0aKostya Serebryany if (!ClGlobals) return false; 7401416edc30adbd53b2be863f7f3de56de4a4c9d0aKostya Serebryany TD = getAnalysisIfAvailable<DataLayout>(); 7411416edc30adbd53b2be863f7f3de56de4a4c9d0aKostya Serebryany if (!TD) 7421416edc30adbd53b2be863f7f3de56de4a4c9d0aKostya Serebryany return false; 743b0dcf61252e58715a3bea79f4c112572df361c30Alexey Samsonov BL.reset(new BlackList(BlacklistFile)); 744d6f62c8da5aa4f3388cec1542309ffa623cac601Alexey Samsonov if (BL->isIn(M)) return false; 745b9a12ea0fd92bfdb4c6eb5af333648a618f68686Kostya Serebryany C = &(M.getContext()); 746b9a12ea0fd92bfdb4c6eb5af333648a618f68686Kostya Serebryany IntptrTy = Type::getIntNTy(*C, TD->getPointerSizeInBits()); 7474684858624d7ffe82379783e9b678227d5e0b515Alexey Samsonov initializeCallbacks(M); 7484684858624d7ffe82379783e9b678227d5e0b515Alexey Samsonov DynamicallyInitializedGlobals.Init(M); 749b9a12ea0fd92bfdb4c6eb5af333648a618f68686Kostya Serebryany 750800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany SmallVector<GlobalVariable *, 16> GlobalsToChange; 751800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 7529b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany for (Module::GlobalListType::iterator G = M.global_begin(), 7539b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany E = M.global_end(); G != E; ++G) { 7549b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany if (ShouldInstrumentGlobal(G)) 7559b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany GlobalsToChange.push_back(G); 756800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 757800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 758800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany size_t n = GlobalsToChange.size(); 759800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (n == 0) return false; 760800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 761800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // A global is described by a structure 762800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // size_t beg; 763800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // size_t size; 764800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // size_t size_with_redzone; 765800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // const char *name; 7669b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany // size_t has_dynamic_init; 767800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // We initialize an array of such structures and pass it to a run-time call. 768800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany StructType *GlobalStructTy = StructType::get(IntptrTy, IntptrTy, 7699b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany IntptrTy, IntptrTy, 7709b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany IntptrTy, NULL); 7719b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany SmallVector<Constant *, 16> Initializers(n), DynamicInit; 772800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 773b9a12ea0fd92bfdb4c6eb5af333648a618f68686Kostya Serebryany 774b9a12ea0fd92bfdb4c6eb5af333648a618f68686Kostya Serebryany Function *CtorFunc = M.getFunction(kAsanModuleCtorName); 775b9a12ea0fd92bfdb4c6eb5af333648a618f68686Kostya Serebryany assert(CtorFunc); 776b9a12ea0fd92bfdb4c6eb5af333648a618f68686Kostya Serebryany IRBuilder<> IRB(CtorFunc->getEntryBlock().getTerminator()); 777800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 7789b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany // The addresses of the first and last dynamically initialized globals in 7799b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany // this TU. Used in initialization order checking. 7809b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany Value *FirstDynamic = 0, *LastDynamic = 0; 7819b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany 782800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany for (size_t i = 0; i < n; i++) { 783800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany GlobalVariable *G = GlobalsToChange[i]; 784800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany PointerType *PtrTy = cast<PointerType>(G->getType()); 785800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Type *Ty = PtrTy->getElementType(); 786208a4ff2b56f453910bb817540f34b8169f7702aKostya Serebryany uint64_t SizeInBytes = TD->getTypeAllocSize(Ty); 787b9a12ea0fd92bfdb4c6eb5af333648a618f68686Kostya Serebryany size_t RZ = RedzoneSize(); 788b9a12ea0fd92bfdb4c6eb5af333648a618f68686Kostya Serebryany uint64_t RightRedzoneSize = RZ + (RZ - (SizeInBytes % RZ)); 789800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Type *RightRedZoneTy = ArrayType::get(IRB.getInt8Ty(), RightRedzoneSize); 7909b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany // Determine whether this global should be poisoned in initialization. 791ca23d43084c45a7d6f4371d62f45be044650ce38Kostya Serebryany bool GlobalHasDynamicInitializer = 792ca23d43084c45a7d6f4371d62f45be044650ce38Kostya Serebryany DynamicallyInitializedGlobals.Contains(G); 79359a4a47a7bea7cc17877c6a3954ad9f8309ff1cbKostya Serebryany // Don't check initialization order if this global is blacklisted. 7947dadac65d375ff21b7a36bfb7642578d2f467525Kostya Serebryany GlobalHasDynamicInitializer &= !BL->isInInit(*G); 795800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 796800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany StructType *NewTy = StructType::get(Ty, RightRedZoneTy, NULL); 797800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Constant *NewInitializer = ConstantStruct::get( 798800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany NewTy, G->getInitializer(), 799800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Constant::getNullValue(RightRedZoneTy), NULL); 800800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 801a4b2b1d8fbb84b0b6fac5abce21a2a5c5e907282Kostya Serebryany SmallString<2048> DescriptionOfGlobal = G->getName(); 802a4b2b1d8fbb84b0b6fac5abce21a2a5c5e907282Kostya Serebryany DescriptionOfGlobal += " ("; 803a4b2b1d8fbb84b0b6fac5abce21a2a5c5e907282Kostya Serebryany DescriptionOfGlobal += M.getModuleIdentifier(); 804a4b2b1d8fbb84b0b6fac5abce21a2a5c5e907282Kostya Serebryany DescriptionOfGlobal += ")"; 805a4b2b1d8fbb84b0b6fac5abce21a2a5c5e907282Kostya Serebryany GlobalVariable *Name = createPrivateGlobalForString(M, DescriptionOfGlobal); 806800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 807800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // Create a new global variable with enough space for a redzone. 808800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany GlobalVariable *NewGlobal = new GlobalVariable( 809800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany M, NewTy, G->isConstant(), G->getLinkage(), 810ce718ff9f42c7da092eaa01dd0242e8d5ba84713Hans Wennborg NewInitializer, "", G, G->getThreadLocalMode()); 811800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany NewGlobal->copyAttributesFrom(G); 812b9a12ea0fd92bfdb4c6eb5af333648a618f68686Kostya Serebryany NewGlobal->setAlignment(RZ); 813800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 814800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *Indices2[2]; 815800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Indices2[0] = IRB.getInt32(0); 816800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Indices2[1] = IRB.getInt32(0); 817800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 818800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany G->replaceAllUsesWith( 819f1639abf1aaba1448f719f595156cd0f4cd560ccKostya Serebryany ConstantExpr::getGetElementPtr(NewGlobal, Indices2, true)); 820800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany NewGlobal->takeName(G); 821800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany G->eraseFromParent(); 822800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 823800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Initializers[i] = ConstantStruct::get( 824800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany GlobalStructTy, 825800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany ConstantExpr::getPointerCast(NewGlobal, IntptrTy), 826800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany ConstantInt::get(IntptrTy, SizeInBytes), 827800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany ConstantInt::get(IntptrTy, SizeInBytes + RightRedzoneSize), 828800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany ConstantExpr::getPointerCast(Name, IntptrTy), 8299b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany ConstantInt::get(IntptrTy, GlobalHasDynamicInitializer), 830800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany NULL); 8319b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany 8329b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany // Populate the first and last globals declared in this TU. 833ee548275c63a1eeffda9d3edd2bea04e1dadcc67Alexey Samsonov if (CheckInitOrder && GlobalHasDynamicInitializer) { 8349b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany LastDynamic = ConstantExpr::getPointerCast(NewGlobal, IntptrTy); 8359b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany if (FirstDynamic == 0) 8369b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany FirstDynamic = LastDynamic; 8379b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany } 8389b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany 839324d96b9e265b0fd8bf63a28340910def64e2164Kostya Serebryany DEBUG(dbgs() << "NEW GLOBAL: " << *NewGlobal << "\n"); 840800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 841800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 842800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany ArrayType *ArrayOfGlobalStructTy = ArrayType::get(GlobalStructTy, n); 843800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany GlobalVariable *AllGlobals = new GlobalVariable( 844800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany M, ArrayOfGlobalStructTy, false, GlobalVariable::PrivateLinkage, 845800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany ConstantArray::get(ArrayOfGlobalStructTy, Initializers), ""); 846800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 8479b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany // Create calls for poisoning before initializers run and unpoisoning after. 848ee548275c63a1eeffda9d3edd2bea04e1dadcc67Alexey Samsonov if (CheckInitOrder && FirstDynamic && LastDynamic) 8499b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany createInitializerPoisonCalls(M, FirstDynamic, LastDynamic); 850800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany IRB.CreateCall2(AsanRegisterGlobals, 851800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany IRB.CreatePointerCast(AllGlobals, IntptrTy), 852800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany ConstantInt::get(IntptrTy, n)); 853800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 8547bcfc9950bac0f411f9671e8d6ce483bd219727eKostya Serebryany // We also need to unregister globals at the end, e.g. when a shared library 8557bcfc9950bac0f411f9671e8d6ce483bd219727eKostya Serebryany // gets closed. 8567bcfc9950bac0f411f9671e8d6ce483bd219727eKostya Serebryany Function *AsanDtorFunction = Function::Create( 8577bcfc9950bac0f411f9671e8d6ce483bd219727eKostya Serebryany FunctionType::get(Type::getVoidTy(*C), false), 8587bcfc9950bac0f411f9671e8d6ce483bd219727eKostya Serebryany GlobalValue::InternalLinkage, kAsanModuleDtorName, &M); 8597bcfc9950bac0f411f9671e8d6ce483bd219727eKostya Serebryany BasicBlock *AsanDtorBB = BasicBlock::Create(*C, "", AsanDtorFunction); 8607bcfc9950bac0f411f9671e8d6ce483bd219727eKostya Serebryany IRBuilder<> IRB_Dtor(ReturnInst::Create(*C, AsanDtorBB)); 8617bcfc9950bac0f411f9671e8d6ce483bd219727eKostya Serebryany IRB_Dtor.CreateCall2(AsanUnregisterGlobals, 8627bcfc9950bac0f411f9671e8d6ce483bd219727eKostya Serebryany IRB.CreatePointerCast(AllGlobals, IntptrTy), 8637bcfc9950bac0f411f9671e8d6ce483bd219727eKostya Serebryany ConstantInt::get(IntptrTy, n)); 8647bcfc9950bac0f411f9671e8d6ce483bd219727eKostya Serebryany appendToGlobalDtors(M, AsanDtorFunction, kAsanCtorAndCtorPriority); 8657bcfc9950bac0f411f9671e8d6ce483bd219727eKostya Serebryany 866800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany DEBUG(dbgs() << M); 867800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany return true; 868800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany} 869800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 8708b390ffbfdd52a23a45a21de99aa1c31f3ce623fKostya Serebryanyvoid AddressSanitizer::initializeCallbacks(Module &M) { 8718b390ffbfdd52a23a45a21de99aa1c31f3ce623fKostya Serebryany IRBuilder<> IRB(*C); 8729db5b5ffa9fccd5c7f1f39a3e9aa66cc4a5eedc1Kostya Serebryany // Create __asan_report* callbacks. 8739db5b5ffa9fccd5c7f1f39a3e9aa66cc4a5eedc1Kostya Serebryany for (size_t AccessIsWrite = 0; AccessIsWrite <= 1; AccessIsWrite++) { 8749db5b5ffa9fccd5c7f1f39a3e9aa66cc4a5eedc1Kostya Serebryany for (size_t AccessSizeIndex = 0; AccessSizeIndex < kNumberOfAccessSizes; 8759db5b5ffa9fccd5c7f1f39a3e9aa66cc4a5eedc1Kostya Serebryany AccessSizeIndex++) { 8769db5b5ffa9fccd5c7f1f39a3e9aa66cc4a5eedc1Kostya Serebryany // IsWrite and TypeSize are encoded in the function name. 8779db5b5ffa9fccd5c7f1f39a3e9aa66cc4a5eedc1Kostya Serebryany std::string FunctionName = std::string(kAsanReportErrorTemplate) + 8789db5b5ffa9fccd5c7f1f39a3e9aa66cc4a5eedc1Kostya Serebryany (AccessIsWrite ? "store" : "load") + itostr(1 << AccessSizeIndex); 8794f0c69623c10a3a49f6926fd53694ee532e06a85Kostya Serebryany // If we are merging crash callbacks, they have two parameters. 8807846c1c851a53a8280f9d8ed57cd98d82c742551Kostya Serebryany AsanErrorCallback[AccessIsWrite][AccessSizeIndex] = 8817846c1c851a53a8280f9d8ed57cd98d82c742551Kostya Serebryany checkInterfaceFunction(M.getOrInsertFunction( 8827846c1c851a53a8280f9d8ed57cd98d82c742551Kostya Serebryany FunctionName, IRB.getVoidTy(), IntptrTy, NULL)); 8839db5b5ffa9fccd5c7f1f39a3e9aa66cc4a5eedc1Kostya Serebryany } 8849db5b5ffa9fccd5c7f1f39a3e9aa66cc4a5eedc1Kostya Serebryany } 885ee4edeccabe1854ee895f52d4ac5588bd5f40c80Kostya Serebryany 886ee4edeccabe1854ee895f52d4ac5588bd5f40c80Kostya Serebryany AsanHandleNoReturnFunc = checkInterfaceFunction(M.getOrInsertFunction( 887ee4edeccabe1854ee895f52d4ac5588bd5f40c80Kostya Serebryany kAsanHandleNoReturnName, IRB.getVoidTy(), NULL)); 888f7b08226eb44458f6f38cbeaca527028803c725aKostya Serebryany // We insert an empty inline asm after __asan_report* to avoid callback merge. 889f7b08226eb44458f6f38cbeaca527028803c725aKostya Serebryany EmptyAsm = InlineAsm::get(FunctionType::get(IRB.getVoidTy(), false), 890f7b08226eb44458f6f38cbeaca527028803c725aKostya Serebryany StringRef(""), StringRef(""), 891f7b08226eb44458f6f38cbeaca527028803c725aKostya Serebryany /*hasSideEffects=*/true); 8928b390ffbfdd52a23a45a21de99aa1c31f3ce623fKostya Serebryany} 8938b390ffbfdd52a23a45a21de99aa1c31f3ce623fKostya Serebryany 8948b390ffbfdd52a23a45a21de99aa1c31f3ce623fKostya Serebryany// virtual 8958b390ffbfdd52a23a45a21de99aa1c31f3ce623fKostya Serebryanybool AddressSanitizer::doInitialization(Module &M) { 8968b390ffbfdd52a23a45a21de99aa1c31f3ce623fKostya Serebryany // Initialize the private fields. No one has accessed them before. 8978b390ffbfdd52a23a45a21de99aa1c31f3ce623fKostya Serebryany TD = getAnalysisIfAvailable<DataLayout>(); 8988b390ffbfdd52a23a45a21de99aa1c31f3ce623fKostya Serebryany 8998b390ffbfdd52a23a45a21de99aa1c31f3ce623fKostya Serebryany if (!TD) 9008b390ffbfdd52a23a45a21de99aa1c31f3ce623fKostya Serebryany return false; 901b0dcf61252e58715a3bea79f4c112572df361c30Alexey Samsonov BL.reset(new BlackList(BlacklistFile)); 9028b390ffbfdd52a23a45a21de99aa1c31f3ce623fKostya Serebryany DynamicallyInitializedGlobals.Init(M); 9038b390ffbfdd52a23a45a21de99aa1c31f3ce623fKostya Serebryany 9048b390ffbfdd52a23a45a21de99aa1c31f3ce623fKostya Serebryany C = &(M.getContext()); 9058b390ffbfdd52a23a45a21de99aa1c31f3ce623fKostya Serebryany LongSize = TD->getPointerSizeInBits(); 9068b390ffbfdd52a23a45a21de99aa1c31f3ce623fKostya Serebryany IntptrTy = Type::getIntNTy(*C, LongSize); 9078b390ffbfdd52a23a45a21de99aa1c31f3ce623fKostya Serebryany 9088b390ffbfdd52a23a45a21de99aa1c31f3ce623fKostya Serebryany AsanCtorFunction = Function::Create( 9098b390ffbfdd52a23a45a21de99aa1c31f3ce623fKostya Serebryany FunctionType::get(Type::getVoidTy(*C), false), 9108b390ffbfdd52a23a45a21de99aa1c31f3ce623fKostya Serebryany GlobalValue::InternalLinkage, kAsanModuleCtorName, &M); 9118b390ffbfdd52a23a45a21de99aa1c31f3ce623fKostya Serebryany BasicBlock *AsanCtorBB = BasicBlock::Create(*C, "", AsanCtorFunction); 9128b390ffbfdd52a23a45a21de99aa1c31f3ce623fKostya Serebryany // call __asan_init in the module ctor. 9138b390ffbfdd52a23a45a21de99aa1c31f3ce623fKostya Serebryany IRBuilder<> IRB(ReturnInst::Create(*C, AsanCtorBB)); 9148b390ffbfdd52a23a45a21de99aa1c31f3ce623fKostya Serebryany AsanInitFunction = checkInterfaceFunction( 9158b390ffbfdd52a23a45a21de99aa1c31f3ce623fKostya Serebryany M.getOrInsertFunction(kAsanInitName, IRB.getVoidTy(), NULL)); 9168b390ffbfdd52a23a45a21de99aa1c31f3ce623fKostya Serebryany AsanInitFunction->setLinkage(Function::ExternalLinkage); 9178b390ffbfdd52a23a45a21de99aa1c31f3ce623fKostya Serebryany IRB.CreateCall(AsanInitFunction); 9189db5b5ffa9fccd5c7f1f39a3e9aa66cc4a5eedc1Kostya Serebryany 91906fdbaa9145f01a291d4981ca5120b7bdcad44c6Evgeniy Stepanov llvm::Triple targetTriple(M.getTargetTriple()); 92043bf70986bb13c812e87ca959dd8f2dd9edf802cLogan Chien bool isAndroid = targetTriple.getEnvironment() == llvm::Triple::Android; 92106fdbaa9145f01a291d4981ca5120b7bdcad44c6Evgeniy Stepanov 92206fdbaa9145f01a291d4981ca5120b7bdcad44c6Evgeniy Stepanov MappingOffset = isAndroid ? kDefaultShadowOffsetAndroid : 92306fdbaa9145f01a291d4981ca5120b7bdcad44c6Evgeniy Stepanov (LongSize == 32 ? kDefaultShadowOffset32 : kDefaultShadowOffset64); 924800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (ClMappingOffsetLog >= 0) { 925800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (ClMappingOffsetLog == 0) { 926800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // special case 927800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany MappingOffset = 0; 928800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } else { 929800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany MappingOffset = 1ULL << ClMappingOffsetLog; 930800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 931800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 932800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 933800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 9348c0134a77615b66f57250f0662bc899e4574551eKostya Serebryany if (ClMappingOffsetLog >= 0) { 9358c0134a77615b66f57250f0662bc899e4574551eKostya Serebryany // Tell the run-time the current values of mapping offset and scale. 9368c0134a77615b66f57250f0662bc899e4574551eKostya Serebryany GlobalValue *asan_mapping_offset = 9378c0134a77615b66f57250f0662bc899e4574551eKostya Serebryany new GlobalVariable(M, IntptrTy, true, GlobalValue::LinkOnceODRLinkage, 9388c0134a77615b66f57250f0662bc899e4574551eKostya Serebryany ConstantInt::get(IntptrTy, MappingOffset), 9398c0134a77615b66f57250f0662bc899e4574551eKostya Serebryany kAsanMappingOffsetName); 9408c0134a77615b66f57250f0662bc899e4574551eKostya Serebryany // Read the global, otherwise it may be optimized away. 9418c0134a77615b66f57250f0662bc899e4574551eKostya Serebryany IRB.CreateLoad(asan_mapping_offset, true); 9428c0134a77615b66f57250f0662bc899e4574551eKostya Serebryany } 9438c0134a77615b66f57250f0662bc899e4574551eKostya Serebryany if (ClMappingScale) { 9448c0134a77615b66f57250f0662bc899e4574551eKostya Serebryany GlobalValue *asan_mapping_scale = 9458c0134a77615b66f57250f0662bc899e4574551eKostya Serebryany new GlobalVariable(M, IntptrTy, true, GlobalValue::LinkOnceODRLinkage, 946b9a12ea0fd92bfdb4c6eb5af333648a618f68686Kostya Serebryany ConstantInt::get(IntptrTy, MappingScale()), 9478c0134a77615b66f57250f0662bc899e4574551eKostya Serebryany kAsanMappingScaleName); 9488c0134a77615b66f57250f0662bc899e4574551eKostya Serebryany // Read the global, otherwise it may be optimized away. 9498c0134a77615b66f57250f0662bc899e4574551eKostya Serebryany IRB.CreateLoad(asan_mapping_scale, true); 9508c0134a77615b66f57250f0662bc899e4574551eKostya Serebryany } 951800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 9527bcfc9950bac0f411f9671e8d6ce483bd219727eKostya Serebryany appendToGlobalCtors(M, AsanCtorFunction, kAsanCtorAndCtorPriority); 9539b02741d2284d9516a59666c211fe1f57e8803adKostya Serebryany 954ee4edeccabe1854ee895f52d4ac5588bd5f40c80Kostya Serebryany return true; 955ee4edeccabe1854ee895f52d4ac5588bd5f40c80Kostya Serebryany} 956ee4edeccabe1854ee895f52d4ac5588bd5f40c80Kostya Serebryany 957a1a8a323f43a95620fc4c6b5aad8d5ff5e5eb590Kostya Serebryanybool AddressSanitizer::maybeInsertAsanInitAtFunctionEntry(Function &F) { 958a1a8a323f43a95620fc4c6b5aad8d5ff5e5eb590Kostya Serebryany // For each NSObject descendant having a +load method, this method is invoked 959a1a8a323f43a95620fc4c6b5aad8d5ff5e5eb590Kostya Serebryany // by the ObjC runtime before any of the static constructors is called. 960a1a8a323f43a95620fc4c6b5aad8d5ff5e5eb590Kostya Serebryany // Therefore we need to instrument such methods with a call to __asan_init 961a1a8a323f43a95620fc4c6b5aad8d5ff5e5eb590Kostya Serebryany // at the beginning in order to initialize our runtime before any access to 962a1a8a323f43a95620fc4c6b5aad8d5ff5e5eb590Kostya Serebryany // the shadow memory. 963a1a8a323f43a95620fc4c6b5aad8d5ff5e5eb590Kostya Serebryany // We cannot just ignore these methods, because they may call other 964a1a8a323f43a95620fc4c6b5aad8d5ff5e5eb590Kostya Serebryany // instrumented functions. 965a1a8a323f43a95620fc4c6b5aad8d5ff5e5eb590Kostya Serebryany if (F.getName().find(" load]") != std::string::npos) { 966a1a8a323f43a95620fc4c6b5aad8d5ff5e5eb590Kostya Serebryany IRBuilder<> IRB(F.begin()->begin()); 967a1a8a323f43a95620fc4c6b5aad8d5ff5e5eb590Kostya Serebryany IRB.CreateCall(AsanInitFunction); 968a1a8a323f43a95620fc4c6b5aad8d5ff5e5eb590Kostya Serebryany return true; 969a1a8a323f43a95620fc4c6b5aad8d5ff5e5eb590Kostya Serebryany } 970a1a8a323f43a95620fc4c6b5aad8d5ff5e5eb590Kostya Serebryany return false; 971a1a8a323f43a95620fc4c6b5aad8d5ff5e5eb590Kostya Serebryany} 972a1a8a323f43a95620fc4c6b5aad8d5ff5e5eb590Kostya Serebryany 973ee4edeccabe1854ee895f52d4ac5588bd5f40c80Kostya Serebryanybool AddressSanitizer::runOnFunction(Function &F) { 974800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (BL->isIn(F)) return false; 975800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (&F == AsanCtorFunction) return false; 976324d96b9e265b0fd8bf63a28340910def64e2164Kostya Serebryany DEBUG(dbgs() << "ASAN instrumenting:\n" << F << "\n"); 9778b390ffbfdd52a23a45a21de99aa1c31f3ce623fKostya Serebryany initializeCallbacks(*F.getParent()); 978a1a8a323f43a95620fc4c6b5aad8d5ff5e5eb590Kostya Serebryany 979a1a8a323f43a95620fc4c6b5aad8d5ff5e5eb590Kostya Serebryany // If needed, insert __asan_init before checking for AddressSafety attr. 980a1a8a323f43a95620fc4c6b5aad8d5ff5e5eb590Kostya Serebryany maybeInsertAsanInitAtFunctionEntry(F); 981a1a8a323f43a95620fc4c6b5aad8d5ff5e5eb590Kostya Serebryany 982034b94b17006f51722886b0f2283fb6fb19aca1fBill Wendling if (!F.getFnAttributes().hasAttribute(Attribute::AddressSafety)) 9836765834754cbb3cb0f15b4b15e98c5e73fa50066Bill Wendling return false; 984800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 985800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (!ClDebugFunc.empty() && ClDebugFunc != F.getName()) 986800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany return false; 9876765834754cbb3cb0f15b4b15e98c5e73fa50066Bill Wendling 9886765834754cbb3cb0f15b4b15e98c5e73fa50066Bill Wendling // We want to instrument every address only once per basic block (unless there 9896765834754cbb3cb0f15b4b15e98c5e73fa50066Bill Wendling // are calls between uses). 990800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany SmallSet<Value*, 16> TempsToInstrument; 991800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany SmallVector<Instruction*, 16> ToInstrument; 99295e3cf44a9d4672655dee3bd558bfeefa631dd55Kostya Serebryany SmallVector<Instruction*, 8> NoReturnCalls; 993e6cf2e0bd09544eeb69665deb908d264e62a71c2Kostya Serebryany bool IsWrite; 994800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 995800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // Fill the set of memory operations to instrument. 996800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany for (Function::iterator FI = F.begin(), FE = F.end(); 997800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany FI != FE; ++FI) { 998800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany TempsToInstrument.clear(); 999324cbb89f2759fb9ad347bd2af4631e50c39c8f3Kostya Serebryany int NumInsnsPerBB = 0; 1000800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany for (BasicBlock::iterator BI = FI->begin(), BE = FI->end(); 1001800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany BI != BE; ++BI) { 1002bcb55ce3862bbbedac4e09d7099c9e0efc434e4bKostya Serebryany if (LooksLikeCodeInBug11395(BI)) return false; 1003e6cf2e0bd09544eeb69665deb908d264e62a71c2Kostya Serebryany if (Value *Addr = isInterestingMemoryAccess(BI, &IsWrite)) { 1004800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (ClOpt && ClOptSameTemp) { 1005800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (!TempsToInstrument.insert(Addr)) 1006800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany continue; // We've seen this temp in the current BB. 1007800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 1008800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } else if (isa<MemIntrinsic>(BI) && ClMemIntrin) { 1009800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // ok, take it. 1010800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } else { 101195e3cf44a9d4672655dee3bd558bfeefa631dd55Kostya Serebryany if (CallInst *CI = dyn_cast<CallInst>(BI)) { 1012800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // A call inside BB. 1013800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany TempsToInstrument.clear(); 1014a17babb021aa9dc3441ecce1ac8a62d2b27edecbKostya Serebryany if (CI->doesNotReturn()) { 101595e3cf44a9d4672655dee3bd558bfeefa631dd55Kostya Serebryany NoReturnCalls.push_back(CI); 101695e3cf44a9d4672655dee3bd558bfeefa631dd55Kostya Serebryany } 1017800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 1018800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany continue; 1019800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 1020800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany ToInstrument.push_back(BI); 1021324cbb89f2759fb9ad347bd2af4631e50c39c8f3Kostya Serebryany NumInsnsPerBB++; 1022324cbb89f2759fb9ad347bd2af4631e50c39c8f3Kostya Serebryany if (NumInsnsPerBB >= ClMaxInsnsToInstrumentPerBB) 1023324cbb89f2759fb9ad347bd2af4631e50c39c8f3Kostya Serebryany break; 1024800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 1025800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 1026800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 1027800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // Instrument. 1028800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany int NumInstrumented = 0; 1029800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany for (size_t i = 0, n = ToInstrument.size(); i != n; i++) { 1030800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Instruction *Inst = ToInstrument[i]; 1031800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (ClDebugMin < 0 || ClDebugMax < 0 || 1032800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany (NumInstrumented >= ClDebugMin && NumInstrumented <= ClDebugMax)) { 1033e6cf2e0bd09544eeb69665deb908d264e62a71c2Kostya Serebryany if (isInterestingMemoryAccess(Inst, &IsWrite)) 1034ee4edeccabe1854ee895f52d4ac5588bd5f40c80Kostya Serebryany instrumentMop(Inst); 1035800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany else 1036ee4edeccabe1854ee895f52d4ac5588bd5f40c80Kostya Serebryany instrumentMemIntrinsic(cast<MemIntrinsic>(Inst)); 1037800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 1038800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany NumInstrumented++; 1039800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 1040800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 104159cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov FunctionStackPoisoner FSP(F, *this); 104259cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov bool ChangedStack = FSP.runOnFunction(); 104395e3cf44a9d4672655dee3bd558bfeefa631dd55Kostya Serebryany 104495e3cf44a9d4672655dee3bd558bfeefa631dd55Kostya Serebryany // We must unpoison the stack before every NoReturn call (throw, _exit, etc). 104595e3cf44a9d4672655dee3bd558bfeefa631dd55Kostya Serebryany // See e.g. http://code.google.com/p/address-sanitizer/issues/detail?id=37 104695e3cf44a9d4672655dee3bd558bfeefa631dd55Kostya Serebryany for (size_t i = 0, n = NoReturnCalls.size(); i != n; i++) { 104795e3cf44a9d4672655dee3bd558bfeefa631dd55Kostya Serebryany Instruction *CI = NoReturnCalls[i]; 104895e3cf44a9d4672655dee3bd558bfeefa631dd55Kostya Serebryany IRBuilder<> IRB(CI); 1049ee4edeccabe1854ee895f52d4ac5588bd5f40c80Kostya Serebryany IRB.CreateCall(AsanHandleNoReturnFunc); 105095e3cf44a9d4672655dee3bd558bfeefa631dd55Kostya Serebryany } 1051324d96b9e265b0fd8bf63a28340910def64e2164Kostya Serebryany DEBUG(dbgs() << "ASAN done instrumenting:\n" << F << "\n"); 105295e3cf44a9d4672655dee3bd558bfeefa631dd55Kostya Serebryany 105395e3cf44a9d4672655dee3bd558bfeefa631dd55Kostya Serebryany return NumInstrumented > 0 || ChangedStack || !NoReturnCalls.empty(); 1054800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany} 1055800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 1056800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystatic uint64_t ValueForPoison(uint64_t PoisonByte, size_t ShadowRedzoneSize) { 1057800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (ShadowRedzoneSize == 1) return PoisonByte; 1058800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (ShadowRedzoneSize == 2) return (PoisonByte << 8) + PoisonByte; 1059800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (ShadowRedzoneSize == 4) 1060800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany return (PoisonByte << 24) + (PoisonByte << 16) + 1061800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany (PoisonByte << 8) + (PoisonByte); 1062858143816d43e58b17bfd11cb1b57afbd7f0f893Craig Topper llvm_unreachable("ShadowRedzoneSize is either 1, 2 or 4"); 1063800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany} 1064800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 1065800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystatic void PoisonShadowPartialRightRedzone(uint8_t *Shadow, 1066800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany size_t Size, 1067b9a12ea0fd92bfdb4c6eb5af333648a618f68686Kostya Serebryany size_t RZSize, 1068800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany size_t ShadowGranularity, 1069800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany uint8_t Magic) { 1070b9a12ea0fd92bfdb4c6eb5af333648a618f68686Kostya Serebryany for (size_t i = 0; i < RZSize; 1071800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany i+= ShadowGranularity, Shadow++) { 1072800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (i + ShadowGranularity <= Size) { 1073800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany *Shadow = 0; // fully addressable 1074800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } else if (i >= Size) { 1075800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany *Shadow = Magic; // unaddressable 1076800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } else { 1077800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany *Shadow = Size - i; // first Size-i bytes are addressable 1078800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 1079800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 1080800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany} 1081800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 108259cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov// Workaround for bug 11395: we don't want to instrument stack in functions 108359cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov// with large assembly blobs (32-bit only), otherwise reg alloc may crash. 108459cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov// FIXME: remove once the bug 11395 is fixed. 108559cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonovbool AddressSanitizer::LooksLikeCodeInBug11395(Instruction *I) { 108659cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov if (LongSize != 32) return false; 108759cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov CallInst *CI = dyn_cast<CallInst>(I); 108859cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov if (!CI || !CI->isInlineAsm()) return false; 108959cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov if (CI->getNumArgOperands() <= 5) return false; 109059cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov // We have inline assembly with quite a few arguments. 109159cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov return true; 109259cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov} 109359cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov 109459cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonovvoid FunctionStackPoisoner::initializeCallbacks(Module &M) { 109559cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov IRBuilder<> IRB(*C); 109659cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov AsanStackMallocFunc = checkInterfaceFunction(M.getOrInsertFunction( 109759cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov kAsanStackMallocName, IntptrTy, IntptrTy, IntptrTy, NULL)); 109859cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov AsanStackFreeFunc = checkInterfaceFunction(M.getOrInsertFunction( 109959cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov kAsanStackFreeName, IRB.getVoidTy(), 110059cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov IntptrTy, IntptrTy, IntptrTy, NULL)); 110159cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov AsanPoisonStackMemoryFunc = checkInterfaceFunction(M.getOrInsertFunction( 110259cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov kAsanPoisonStackMemoryName, IRB.getVoidTy(), IntptrTy, IntptrTy, NULL)); 110359cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov AsanUnpoisonStackMemoryFunc = checkInterfaceFunction(M.getOrInsertFunction( 110459cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov kAsanUnpoisonStackMemoryName, IRB.getVoidTy(), IntptrTy, IntptrTy, NULL)); 110559cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov} 110659cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov 110759cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonovvoid FunctionStackPoisoner::poisonRedZones( 110859cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov const ArrayRef<AllocaInst*> &AllocaVec, IRBuilder<> IRB, Value *ShadowBase, 110959cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov bool DoPoison) { 1110b9a12ea0fd92bfdb4c6eb5af333648a618f68686Kostya Serebryany size_t ShadowRZSize = RedzoneSize() >> MappingScale(); 1111800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany assert(ShadowRZSize >= 1 && ShadowRZSize <= 4); 1112800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Type *RZTy = Type::getIntNTy(*C, ShadowRZSize * 8); 1113800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Type *RZPtrTy = PointerType::get(RZTy, 0); 1114800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 1115800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *PoisonLeft = ConstantInt::get(RZTy, 1116800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany ValueForPoison(DoPoison ? kAsanStackLeftRedzoneMagic : 0LL, ShadowRZSize)); 1117800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *PoisonMid = ConstantInt::get(RZTy, 1118800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany ValueForPoison(DoPoison ? kAsanStackMidRedzoneMagic : 0LL, ShadowRZSize)); 1119800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *PoisonRight = ConstantInt::get(RZTy, 1120800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany ValueForPoison(DoPoison ? kAsanStackRightRedzoneMagic : 0LL, ShadowRZSize)); 1121800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 1122800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // poison the first red zone. 1123800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany IRB.CreateStore(PoisonLeft, IRB.CreateIntToPtr(ShadowBase, RZPtrTy)); 1124800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 1125800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // poison all other red zones. 1126b9a12ea0fd92bfdb4c6eb5af333648a618f68686Kostya Serebryany uint64_t Pos = RedzoneSize(); 1127800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany for (size_t i = 0, n = AllocaVec.size(); i < n; i++) { 1128800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany AllocaInst *AI = AllocaVec[i]; 1129800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany uint64_t SizeInBytes = getAllocaSizeInBytes(AI); 1130800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany uint64_t AlignedSize = getAlignedAllocaSize(AI); 1131b9a12ea0fd92bfdb4c6eb5af333648a618f68686Kostya Serebryany assert(AlignedSize - SizeInBytes < RedzoneSize()); 1132800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *Ptr = NULL; 1133800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 1134800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Pos += AlignedSize; 1135800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 1136800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany assert(ShadowBase->getType() == IntptrTy); 1137800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (SizeInBytes < AlignedSize) { 1138800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // Poison the partial redzone at right 1139800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Ptr = IRB.CreateAdd( 1140800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany ShadowBase, ConstantInt::get(IntptrTy, 1141b9a12ea0fd92bfdb4c6eb5af333648a618f68686Kostya Serebryany (Pos >> MappingScale()) - ShadowRZSize)); 1142b9a12ea0fd92bfdb4c6eb5af333648a618f68686Kostya Serebryany size_t AddressableBytes = RedzoneSize() - (AlignedSize - SizeInBytes); 1143800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany uint32_t Poison = 0; 1144800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (DoPoison) { 1145800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany PoisonShadowPartialRightRedzone((uint8_t*)&Poison, AddressableBytes, 1146b9a12ea0fd92bfdb4c6eb5af333648a618f68686Kostya Serebryany RedzoneSize(), 1147b9a12ea0fd92bfdb4c6eb5af333648a618f68686Kostya Serebryany 1ULL << MappingScale(), 1148800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany kAsanStackPartialRedzoneMagic); 1149800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 1150800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *PartialPoison = ConstantInt::get(RZTy, Poison); 1151800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany IRB.CreateStore(PartialPoison, IRB.CreateIntToPtr(Ptr, RZPtrTy)); 1152800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 1153800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 1154800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // Poison the full redzone at right. 1155800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Ptr = IRB.CreateAdd(ShadowBase, 1156b9a12ea0fd92bfdb4c6eb5af333648a618f68686Kostya Serebryany ConstantInt::get(IntptrTy, Pos >> MappingScale())); 1157800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *Poison = i == AllocaVec.size() - 1 ? PoisonRight : PoisonMid; 1158800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany IRB.CreateStore(Poison, IRB.CreateIntToPtr(Ptr, RZPtrTy)); 1159800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 1160b9a12ea0fd92bfdb4c6eb5af333648a618f68686Kostya Serebryany Pos += RedzoneSize(); 1161800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 1162800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany} 1163800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 116459cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonovvoid FunctionStackPoisoner::poisonStack() { 1165f985f44b13681071e585acb7a5703a2c1c23b6ceAlexey Samsonov bool HavePoisonedAllocas = false; 116659cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov uint64_t LocalStackSize = TotalStackSize + 116759cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov (AllocaVec.size() + 1) * RedzoneSize(); 1168800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 116959cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov bool DoStackMalloc = ASan.CheckUseAfterReturn 1170800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany && LocalStackSize <= kMaxStackMallocSize; 1171800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 1172800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Instruction *InsBefore = AllocaVec[0]; 1173800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany IRBuilder<> IRB(InsBefore); 1174800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 1175800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 1176800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Type *ByteArrayTy = ArrayType::get(IRB.getInt8Ty(), LocalStackSize); 1177800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany AllocaInst *MyAlloca = 1178800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany new AllocaInst(ByteArrayTy, "MyAlloca", InsBefore); 117959cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov if (ClRealignStack && StackAlignment < RedzoneSize()) 118059cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov StackAlignment = RedzoneSize(); 118159cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov MyAlloca->setAlignment(StackAlignment); 1182800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany assert(MyAlloca->isStaticAlloca()); 1183800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *OrigStackBase = IRB.CreatePointerCast(MyAlloca, IntptrTy); 1184800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *LocalStackBase = OrigStackBase; 1185800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 1186800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (DoStackMalloc) { 1187800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany LocalStackBase = IRB.CreateCall2(AsanStackMallocFunc, 1188800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany ConstantInt::get(IntptrTy, LocalStackSize), OrigStackBase); 1189800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 1190800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 1191800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // This string will be parsed by the run-time (DescribeStackAddress). 1192800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany SmallString<2048> StackDescriptionStorage; 1193800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany raw_svector_ostream StackDescription(StackDescriptionStorage); 1194800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany StackDescription << F.getName() << " " << AllocaVec.size() << " "; 1195800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 1196b9a12ea0fd92bfdb4c6eb5af333648a618f68686Kostya Serebryany uint64_t Pos = RedzoneSize(); 1197800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // Replace Alloca instructions with base+offset. 1198800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany for (size_t i = 0, n = AllocaVec.size(); i < n; i++) { 1199800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany AllocaInst *AI = AllocaVec[i]; 1200800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany uint64_t SizeInBytes = getAllocaSizeInBytes(AI); 1201800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany StringRef Name = AI->getName(); 1202800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany StackDescription << Pos << " " << SizeInBytes << " " 1203800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany << Name.size() << " " << Name << " "; 1204800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany uint64_t AlignedSize = getAlignedAllocaSize(AI); 1205b9a12ea0fd92bfdb4c6eb5af333648a618f68686Kostya Serebryany assert((AlignedSize % RedzoneSize()) == 0); 1206f985f44b13681071e585acb7a5703a2c1c23b6ceAlexey Samsonov Value *NewAllocaPtr = IRB.CreateIntToPtr( 1207800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany IRB.CreateAdd(LocalStackBase, ConstantInt::get(IntptrTy, Pos)), 1208f985f44b13681071e585acb7a5703a2c1c23b6ceAlexey Samsonov AI->getType()); 12091afbb517965e29b07cb42e2335d5eadd87de6535Alexey Samsonov replaceDbgDeclareForAlloca(AI, NewAllocaPtr, DIB); 1210f985f44b13681071e585acb7a5703a2c1c23b6ceAlexey Samsonov AI->replaceAllUsesWith(NewAllocaPtr); 1211f985f44b13681071e585acb7a5703a2c1c23b6ceAlexey Samsonov // Analyze lifetime intrinsics only for static allocas we handle. 121259cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov if (ASan.CheckLifetime) 1213f985f44b13681071e585acb7a5703a2c1c23b6ceAlexey Samsonov HavePoisonedAllocas |= handleAllocaLifetime(NewAllocaPtr); 1214b9a12ea0fd92bfdb4c6eb5af333648a618f68686Kostya Serebryany Pos += AlignedSize + RedzoneSize(); 1215800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 1216800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany assert(Pos == LocalStackSize); 1217800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 1218800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // Write the Magic value and the frame description constant to the redzone. 1219800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *BasePlus0 = IRB.CreateIntToPtr(LocalStackBase, IntptrPtrTy); 1220800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany IRB.CreateStore(ConstantInt::get(IntptrTy, kCurrentStackFrameMagic), 1221800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany BasePlus0); 1222800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *BasePlus1 = IRB.CreateAdd(LocalStackBase, 122359cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov ConstantInt::get(IntptrTy, 122459cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov ASan.LongSize/8)); 1225800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany BasePlus1 = IRB.CreateIntToPtr(BasePlus1, IntptrPtrTy); 12269ce84c1c95c0153a2f33e188ce0db00770425f9eAlexey Samsonov GlobalVariable *StackDescriptionGlobal = 1227a5f54f14435d881b10d8eb65e19fa42af95757e9Kostya Serebryany createPrivateGlobalForString(*F.getParent(), StackDescription.str()); 122859cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov Value *Description = IRB.CreatePointerCast(StackDescriptionGlobal, 122959cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov IntptrTy); 1230800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany IRB.CreateStore(Description, BasePlus1); 1231800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 1232800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // Poison the stack redzones at the entry. 123359cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov Value *ShadowBase = ASan.memToShadow(LocalStackBase, IRB); 123459cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov poisonRedZones(AllocaVec, IRB, ShadowBase, true); 1235800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 1236800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // Unpoison the stack before all ret instructions. 1237800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany for (size_t i = 0, n = RetVec.size(); i < n; i++) { 1238800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Instruction *Ret = RetVec[i]; 1239800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany IRBuilder<> IRBRet(Ret); 1240800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // Mark the current frame as retired. 1241800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany IRBRet.CreateStore(ConstantInt::get(IntptrTy, kRetiredStackFrameMagic), 1242800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany BasePlus0); 1243800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // Unpoison the stack. 124459cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov poisonRedZones(AllocaVec, IRBRet, ShadowBase, false); 1245800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (DoStackMalloc) { 1246f985f44b13681071e585acb7a5703a2c1c23b6ceAlexey Samsonov // In use-after-return mode, mark the whole stack frame unaddressable. 1247800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany IRBRet.CreateCall3(AsanStackFreeFunc, LocalStackBase, 1248800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany ConstantInt::get(IntptrTy, LocalStackSize), 1249800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany OrigStackBase); 1250f985f44b13681071e585acb7a5703a2c1c23b6ceAlexey Samsonov } else if (HavePoisonedAllocas) { 1251f985f44b13681071e585acb7a5703a2c1c23b6ceAlexey Samsonov // If we poisoned some allocas in llvm.lifetime analysis, 1252f985f44b13681071e585acb7a5703a2c1c23b6ceAlexey Samsonov // unpoison whole stack frame now. 1253f985f44b13681071e585acb7a5703a2c1c23b6ceAlexey Samsonov assert(LocalStackBase == OrigStackBase); 1254f985f44b13681071e585acb7a5703a2c1c23b6ceAlexey Samsonov poisonAlloca(LocalStackBase, LocalStackSize, IRBRet, false); 1255800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 1256800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 1257800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 1258bd0052a0f26f04b8fcf59e8f645e5e33751e1f6eKostya Serebryany // We are done. Remove the old unused alloca instructions. 1259bd0052a0f26f04b8fcf59e8f645e5e33751e1f6eKostya Serebryany for (size_t i = 0, n = AllocaVec.size(); i < n; i++) 1260bd0052a0f26f04b8fcf59e8f645e5e33751e1f6eKostya Serebryany AllocaVec[i]->eraseFromParent(); 1261800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany} 1262f985f44b13681071e585acb7a5703a2c1c23b6ceAlexey Samsonov 126359cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonovvoid FunctionStackPoisoner::poisonAlloca(Value *V, uint64_t Size, 126459cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov IRBuilder<> IRB, bool DoPoison) { 1265f985f44b13681071e585acb7a5703a2c1c23b6ceAlexey Samsonov // For now just insert the call to ASan runtime. 1266f985f44b13681071e585acb7a5703a2c1c23b6ceAlexey Samsonov Value *AddrArg = IRB.CreatePointerCast(V, IntptrTy); 1267f985f44b13681071e585acb7a5703a2c1c23b6ceAlexey Samsonov Value *SizeArg = ConstantInt::get(IntptrTy, Size); 1268f985f44b13681071e585acb7a5703a2c1c23b6ceAlexey Samsonov IRB.CreateCall2(DoPoison ? AsanPoisonStackMemoryFunc 1269f985f44b13681071e585acb7a5703a2c1c23b6ceAlexey Samsonov : AsanUnpoisonStackMemoryFunc, 1270f985f44b13681071e585acb7a5703a2c1c23b6ceAlexey Samsonov AddrArg, SizeArg); 1271f985f44b13681071e585acb7a5703a2c1c23b6ceAlexey Samsonov} 127259cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov 127359cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov// Handling llvm.lifetime intrinsics for a given %alloca: 127459cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov// (1) collect all llvm.lifetime.xxx(%size, %value) describing the alloca. 127559cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov// (2) if %size is constant, poison memory for llvm.lifetime.end (to detect 127659cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov// invalid accesses) and unpoison it for llvm.lifetime.start (the memory 127759cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov// could be poisoned by previous llvm.lifetime.end instruction, as the 127859cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov// variable may go in and out of scope several times, e.g. in loops). 127959cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov// (3) if we poisoned at least one %alloca in a function, 128059cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov// unpoison the whole stack frame at function exit. 128159cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonovbool FunctionStackPoisoner::handleAllocaLifetime(Value *Alloca) { 128259cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov assert(ASan.CheckLifetime); 128359cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov Type *AllocaType = Alloca->getType(); 128459cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov Type *Int8PtrTy = Type::getInt8PtrTy(AllocaType->getContext()); 128559cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov 128659cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov bool Res = false; 128759cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov // Typical code looks like this: 128859cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov // %alloca = alloca <type>, <alignment> 128959cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov // ... some code ... 129059cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov // %val1 = bitcast <type>* %alloca to i8* 129159cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov // call void @llvm.lifetime.start(i64 <size>, i8* %val1) 129259cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov // ... more code ... 129359cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov // %val2 = bitcast <type>* %alloca to i8* 129459cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov // call void @llvm.lifetime.start(i64 <size>, i8* %val2) 129559cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov // That is, to handle %alloca we must find all its casts to 129659cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov // i8* values, and find lifetime instructions for these values. 129759cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov if (AllocaType == Int8PtrTy) 129859cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov Res |= handleValueLifetime(Alloca); 129959cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov for (Value::use_iterator UI = Alloca->use_begin(), UE = Alloca->use_end(); 130059cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov UI != UE; ++UI) { 130159cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov if (UI->getType() != Int8PtrTy) continue; 130259cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov if (UI->stripPointerCasts() != Alloca) continue; 130359cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov Res |= handleValueLifetime(*UI); 130459cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov } 130559cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov return Res; 130659cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov} 130759cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov 130859cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonovbool FunctionStackPoisoner::handleValueLifetime(Value *V) { 130959cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov assert(ASan.CheckLifetime); 131059cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov bool Res = false; 131159cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov for (Value::use_iterator UI = V->use_begin(), UE = V->use_end(); UI != UE; 131259cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov ++UI) { 131359cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov IntrinsicInst *II = dyn_cast<IntrinsicInst>(*UI); 131459cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov if (!II) continue; 131559cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov Intrinsic::ID ID = II->getIntrinsicID(); 131659cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov if (ID != Intrinsic::lifetime_start && 131759cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov ID != Intrinsic::lifetime_end) 131859cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov continue; 131959cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov if (V != II->getArgOperand(1)) 132059cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov continue; 132159cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov // Found lifetime intrinsic, add ASan instrumentation if necessary. 132259cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov ConstantInt *Size = dyn_cast<ConstantInt>(II->getArgOperand(0)); 132359cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov // If size argument is undefined, don't do anything. 132459cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov if (Size->isMinusOne()) 132559cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov continue; 132659cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov // Check that size doesn't saturate uint64_t and can 132759cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov // be stored in IntptrTy. 132859cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov const uint64_t SizeValue = Size->getValue().getLimitedValue(); 132959cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov if (SizeValue == ~0ULL || 133059cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov !ConstantInt::isValueValidForType(IntptrTy, SizeValue)) { 133159cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov continue; 133259cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov } 133359cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov IRBuilder<> IRB(II); 133459cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov bool DoPoison = (ID == Intrinsic::lifetime_end); 133559cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov poisonAlloca(V, SizeValue, IRB, DoPoison); 133659cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov Res = true; 133759cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov } 133859cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov return Res; 133959cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov} 1340