asan_internal.h revision eb8c46e419f4c6f01d1b1a0d1b96cc51a61ecbc3
1//===-- asan_internal.h -----------------------------------------*- C++ -*-===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 10// This file is a part of AddressSanitizer, an address sanity checker. 11// 12// ASan-private header which defines various general utilities. 13//===----------------------------------------------------------------------===// 14#ifndef ASAN_INTERNAL_H 15#define ASAN_INTERNAL_H 16 17#include "asan_flags.h" 18#include "sanitizer_common/sanitizer_common.h" 19#include "sanitizer_common/sanitizer_internal_defs.h" 20#include "sanitizer_common/sanitizer_libc.h" 21 22#if !defined(__linux__) && !defined(__APPLE__) && !defined(_WIN32) 23# error "This operating system is not supported by AddressSanitizer" 24#endif 25 26#if defined(_WIN32) 27extern "C" void* _ReturnAddress(void); 28# pragma intrinsic(_ReturnAddress) 29#endif // defined(_WIN32) 30 31#define ASAN_DEFAULT_FAILURE_EXITCODE 1 32 33#if defined(__linux__) 34# define ASAN_LINUX 1 35#else 36# define ASAN_LINUX 0 37#endif 38 39#if defined(__APPLE__) 40# define ASAN_MAC 1 41#else 42# define ASAN_MAC 0 43#endif 44 45#if defined(_WIN32) 46# define ASAN_WINDOWS 1 47#else 48# define ASAN_WINDOWS 0 49#endif 50 51#define ASAN_POSIX (ASAN_LINUX || ASAN_MAC) 52 53#if __has_feature(address_sanitizer) 54# error "The AddressSanitizer run-time should not be" 55 " instrumented by AddressSanitizer" 56#endif 57 58// Build-time configuration options. 59 60// If set, asan will install its own SEGV signal handler. 61#ifndef ASAN_NEEDS_SEGV 62# define ASAN_NEEDS_SEGV 1 63#endif 64 65// If set, asan will intercept C++ exception api call(s). 66#ifndef ASAN_HAS_EXCEPTIONS 67# define ASAN_HAS_EXCEPTIONS 1 68#endif 69 70// If set, asan uses the values of SHADOW_SCALE and SHADOW_OFFSET 71// provided by the instrumented objects. Otherwise constants are used. 72#ifndef ASAN_FLEXIBLE_MAPPING_AND_OFFSET 73# define ASAN_FLEXIBLE_MAPPING_AND_OFFSET 0 74#endif 75 76// If set, values like allocator chunk size, as well as defaults for some flags 77// will be changed towards less memory overhead. 78#ifndef ASAN_LOW_MEMORY 79# define ASAN_LOW_MEMORY 0 80#endif 81 82// All internal functions in asan reside inside the __asan namespace 83// to avoid namespace collisions with the user programs. 84// Seperate namespace also makes it simpler to distinguish the asan run-time 85// functions from the instrumented user code in a profile. 86namespace __asan { 87 88class AsanThread; 89struct AsanStackTrace; 90 91// asan_rtl.cc 92void NORETURN ShowStatsAndAbort(); 93 94void ReplaceOperatorsNewAndDelete(); 95// asan_malloc_linux.cc / asan_malloc_mac.cc 96void ReplaceSystemMalloc(); 97 98// asan_linux.cc / asan_mac.cc / asan_win.cc 99void *AsanDoesNotSupportStaticLinkage(); 100 101void GetPcSpBp(void *context, uptr *pc, uptr *sp, uptr *bp); 102 103void MaybeReexec(); 104bool AsanInterceptsSignal(int signum); 105void SetAlternateSignalStack(); 106void UnsetAlternateSignalStack(); 107void InstallSignalHandlers(); 108void AsanPlatformThreadInit(); 109 110// Wrapper for TLS/TSD. 111void AsanTSDInit(void (*destructor)(void *tsd)); 112void *AsanTSDGet(); 113void AsanTSDSet(void *tsd); 114 115void AppendToErrorMessageBuffer(const char *buffer); 116// asan_printf.cc 117void AsanPrintf(const char *format, ...); 118void AsanReport(const char *format, ...); 119 120// asan_poisoning.cc 121// Poisons the shadow memory for "size" bytes starting from "addr". 122void PoisonShadow(uptr addr, uptr size, u8 value); 123// Poisons the shadow memory for "redzone_size" bytes starting from 124// "addr + size". 125void PoisonShadowPartialRightRedzone(uptr addr, 126 uptr size, 127 uptr redzone_size, 128 u8 value); 129 130// Platfrom-specific options. 131#ifdef __APPLE__ 132bool PlatformHasDifferentMemcpyAndMemmove(); 133# define PLATFORM_HAS_DIFFERENT_MEMCPY_AND_MEMMOVE \ 134 (PlatformHasDifferentMemcpyAndMemmove()) 135#else 136# define PLATFORM_HAS_DIFFERENT_MEMCPY_AND_MEMMOVE true 137#endif // __APPLE__ 138 139extern int asan_inited; 140// Used to avoid infinite recursion in __asan_init(). 141extern bool asan_init_is_running; 142extern void (*death_callback)(void); 143 144enum LinkerInitialized { LINKER_INITIALIZED = 0 }; 145 146#define ASAN_ARRAY_SIZE(a) (sizeof(a)/sizeof((a)[0])) 147 148#if !defined(_WIN32) || defined(__clang__) 149# define GET_CALLER_PC() (uptr)__builtin_return_address(0) 150# define GET_CURRENT_FRAME() (uptr)__builtin_frame_address(0) 151#else 152# define GET_CALLER_PC() (uptr)_ReturnAddress() 153// CaptureStackBackTrace doesn't need to know BP on Windows. 154// FIXME: This macro is still used when printing error reports though it's not 155// clear if the BP value is needed in the ASan reports on Windows. 156# define GET_CURRENT_FRAME() (uptr)0xDEADBEEF 157#endif 158 159#ifdef _WIN32 160bool WinSymbolize(const void *addr, char *out_buffer, int buffer_size); 161#endif // _WIN32 162 163// These magic values are written to shadow for better error reporting. 164const int kAsanHeapLeftRedzoneMagic = 0xfa; 165const int kAsanHeapRightRedzoneMagic = 0xfb; 166const int kAsanHeapFreeMagic = 0xfd; 167const int kAsanStackLeftRedzoneMagic = 0xf1; 168const int kAsanStackMidRedzoneMagic = 0xf2; 169const int kAsanStackRightRedzoneMagic = 0xf3; 170const int kAsanStackPartialRedzoneMagic = 0xf4; 171const int kAsanStackAfterReturnMagic = 0xf5; 172const int kAsanInitializationOrderMagic = 0xf6; 173const int kAsanUserPoisonedMemoryMagic = 0xf7; 174const int kAsanGlobalRedzoneMagic = 0xf9; 175const int kAsanInternalHeapMagic = 0xfe; 176 177static const uptr kCurrentStackFrameMagic = 0x41B58AB3; 178static const uptr kRetiredStackFrameMagic = 0x45E0360E; 179 180// -------------------------- LowLevelAllocator ----- {{{1 181// A simple low-level memory allocator for internal use. 182class LowLevelAllocator { 183 public: 184 explicit LowLevelAllocator(LinkerInitialized) {} 185 // 'size' must be a power of two. 186 // Requires an external lock. 187 void *Allocate(uptr size); 188 private: 189 char *allocated_end_; 190 char *allocated_current_; 191}; 192 193} // namespace __asan 194 195#endif // ASAN_INTERNAL_H 196