asan_internal.h revision f8e6fee734cf5e3d061f576244b2704853148b04
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#if !defined(__linux__) && !defined(__APPLE__) && !defined(_WIN32) 18# error "This operating system is not supported by AddressSanitizer" 19#endif 20 21#include <stddef.h> // for size_t, uintptr_t, etc. 22 23#if defined(_WIN32) 24// There's no <stdint.h> in Visual Studio 9, so we have to define [u]int*_t. 25typedef unsigned __int8 uint8_t; 26typedef unsigned __int16 uint16_t; 27typedef unsigned __int32 uint32_t; 28typedef unsigned __int64 uint64_t; 29typedef __int8 int8_t; 30typedef __int16 int16_t; 31typedef __int32 int32_t; 32typedef __int64 int64_t; 33typedef unsigned long DWORD; // NOLINT 34 35extern "C" void* _ReturnAddress(void); 36# pragma intrinsic(_ReturnAddress) 37 38# define ALIAS(x) // TODO(timurrrr): do we need this on Windows? 39# define ALIGNED(x) __declspec(align(x)) 40# define NOINLINE __declspec(noinline) 41# define NORETURN __declspec(noreturn) 42 43# define ASAN_INTERFACE_ATTRIBUTE // TODO(timurrrr): do we need this on Win? 44#else // defined(_WIN32) 45# include <stdint.h> // for __WORDSIZE 46 47# define ALIAS(x) __attribute__((alias(x))) 48# define ALIGNED(x) __attribute__((aligned(x))) 49# define NOINLINE __attribute__((noinline)) 50# define NORETURN __attribute__((noreturn)) 51 52# define ASAN_INTERFACE_ATTRIBUTE __attribute__((visibility("default"))) 53#endif // defined(_WIN32) 54 55// If __WORDSIZE was undefined by the platform, define it in terms of the 56// compiler built-ins __LP64__ and _WIN64. 57#ifndef __WORDSIZE 58#if __LP64__ || defined(_WIN64) 59#define __WORDSIZE 64 60#else 61#define __WORDSIZE 32 62#endif 63#endif 64 65// Limits for integral types. We have to redefine it in case we don't 66// have stdint.h (like in Visual Studio 9). 67#if __WORDSIZE == 64 68# define __INT64_C(c) c ## L 69# define __UINT64_C(c) c ## UL 70#else 71# define __INT64_C(c) c ## LL 72# define __UINT64_C(c) c ## ULL 73#endif // __WORDSIZE == 64 74#undef INT32_MIN 75#define INT32_MIN (-2147483647-1) 76#undef INT32_MAX 77#define INT32_MAX (2147483647) 78#undef UINT32_MAX 79#define UINT32_MAX (4294967295U) 80#undef INT64_MIN 81#define INT64_MIN (-__INT64_C(9223372036854775807)-1) 82#undef INT64_MAX 83#define INT64_MAX (__INT64_C(9223372036854775807)) 84#undef UINT64_MAX 85#define UINT64_MAX (__UINT64_C(18446744073709551615)) 86 87#define ASAN_DEFAULT_FAILURE_EXITCODE 1 88 89#if defined(__linux__) 90# define ASAN_LINUX 1 91#else 92# define ASAN_LINUX 0 93#endif 94 95#if defined(__APPLE__) 96# define ASAN_MAC 1 97#else 98# define ASAN_MAC 0 99#endif 100 101#if defined(_WIN32) 102# define ASAN_WINDOWS 1 103#else 104# define ASAN_WINDOWS 0 105#endif 106 107#define ASAN_POSIX (ASAN_LINUX || ASAN_MAC) 108 109#if !defined(__has_feature) 110#define __has_feature(x) 0 111#endif 112 113#if defined(__has_feature) && __has_feature(address_sanitizer) 114# error "The AddressSanitizer run-time should not be" 115 " instrumented by AddressSanitizer" 116#endif 117 118// Build-time configuration options. 119 120// If set, asan will install its own SEGV signal handler. 121#ifndef ASAN_NEEDS_SEGV 122# define ASAN_NEEDS_SEGV 1 123#endif 124 125// If set, asan will intercept C++ exception api call(s). 126#ifndef ASAN_HAS_EXCEPTIONS 127# define ASAN_HAS_EXCEPTIONS 1 128#endif 129 130// If set, asan uses the values of SHADOW_SCALE and SHADOW_OFFSET 131// provided by the instrumented objects. Otherwise constants are used. 132#ifndef ASAN_FLEXIBLE_MAPPING_AND_OFFSET 133# define ASAN_FLEXIBLE_MAPPING_AND_OFFSET 0 134#endif 135 136// If set, values like allocator chunk size, as well as defaults for some flags 137// will be changed towards less memory overhead. 138#ifndef ASAN_LOW_MEMORY 139# define ASAN_LOW_MEMORY 0 140#endif 141 142// All internal functions in asan reside inside the __asan namespace 143// to avoid namespace collisions with the user programs. 144// Seperate namespace also makes it simpler to distinguish the asan run-time 145// functions from the instrumented user code in a profile. 146namespace __asan { 147 148class AsanThread; 149struct AsanStackTrace; 150 151// asan_rtl.cc 152void NORETURN CheckFailed(const char *cond, const char *file, int line); 153void NORETURN ShowStatsAndAbort(); 154 155// asan_globals.cc 156bool DescribeAddrIfGlobal(uintptr_t addr); 157 158// asan_malloc_linux.cc / asan_malloc_mac.cc 159void ReplaceSystemMalloc(); 160 161void OutOfMemoryMessageAndDie(const char *mem_type, size_t size); 162 163// asan_linux.cc / asan_mac.cc / asan_win.cc 164void *AsanDoesNotSupportStaticLinkage(); 165bool AsanShadowRangeIsAvailable(); 166int AsanOpenReadonly(const char* filename); 167const char *AsanGetEnv(const char *name); 168void AsanDumpProcessMap(); 169 170void *AsanMmapFixedNoReserve(uintptr_t fixed_addr, size_t size); 171void *AsanMmapFixedReserve(uintptr_t fixed_addr, size_t size); 172void *AsanMprotect(uintptr_t fixed_addr, size_t size); 173void *AsanMmapSomewhereOrDie(size_t size, const char *where); 174void AsanUnmapOrDie(void *ptr, size_t size); 175 176void AsanDisableCoreDumper(); 177void GetPcSpBp(void *context, uintptr_t *pc, uintptr_t *sp, uintptr_t *bp); 178 179size_t AsanRead(int fd, void *buf, size_t count); 180size_t AsanWrite(int fd, const void *buf, size_t count); 181int AsanClose(int fd); 182 183bool AsanInterceptsSignal(int signum); 184void SetAlternateSignalStack(); 185void UnsetAlternateSignalStack(); 186void InstallSignalHandlers(); 187int GetPid(); 188uintptr_t GetThreadSelf(); 189int AtomicInc(int *a); 190uint16_t AtomicExchange(uint16_t *a, uint16_t new_val); 191 192// Wrapper for TLS/TSD. 193void AsanTSDInit(void (*destructor)(void *tsd)); 194void *AsanTSDGet(); 195void AsanTSDSet(void *tsd); 196 197// Opens the file 'file_name" and reads up to 'max_len' bytes. 198// The resulting buffer is mmaped and stored in '*buff'. 199// The size of the mmaped region is stored in '*buff_size', 200// Returns the number of read bytes or 0 if file can not be opened. 201size_t ReadFileToBuffer(const char *file_name, char **buff, 202 size_t *buff_size, size_t max_len); 203 204// asan_printf.cc 205void RawWrite(const char *buffer); 206int SNPrintf(char *buffer, size_t length, const char *format, ...); 207void Printf(const char *format, ...); 208int SScanf(const char *str, const char *format, ...); 209void Report(const char *format, ...); 210 211// Don't use std::min and std::max, to minimize dependency on libstdc++. 212template<class T> T Min(T a, T b) { return a < b ? a : b; } 213template<class T> T Max(T a, T b) { return a > b ? a : b; } 214 215void SortArray(uintptr_t *array, size_t size); 216 217// asan_poisoning.cc 218// Poisons the shadow memory for "size" bytes starting from "addr". 219void PoisonShadow(uintptr_t addr, size_t size, uint8_t value); 220// Poisons the shadow memory for "redzone_size" bytes starting from 221// "addr + size". 222void PoisonShadowPartialRightRedzone(uintptr_t addr, 223 uintptr_t size, 224 uintptr_t redzone_size, 225 uint8_t value); 226 227// Platfrom-specific options. 228#ifdef __APPLE__ 229bool PlatformHasDifferentMemcpyAndMemmove(); 230# define PLATFORM_HAS_DIFFERENT_MEMCPY_AND_MEMMOVE \ 231 (PlatformHasDifferentMemcpyAndMemmove()) 232#else 233# define PLATFORM_HAS_DIFFERENT_MEMCPY_AND_MEMMOVE true 234#endif // __APPLE__ 235 236extern size_t FLAG_quarantine_size; 237extern int FLAG_demangle; 238extern bool FLAG_symbolize; 239extern int FLAG_v; 240extern size_t FLAG_redzone; 241extern int FLAG_debug; 242extern bool FLAG_poison_shadow; 243extern int FLAG_report_globals; 244extern size_t FLAG_malloc_context_size; 245extern bool FLAG_replace_str; 246extern bool FLAG_replace_intrin; 247extern bool FLAG_replace_cfallocator; 248extern bool FLAG_fast_unwind; 249extern bool FLAG_use_fake_stack; 250extern size_t FLAG_max_malloc_fill_size; 251extern int FLAG_exitcode; 252extern bool FLAG_allow_user_poisoning; 253extern int FLAG_sleep_before_dying; 254extern bool FLAG_handle_segv; 255extern bool FLAG_use_sigaltstack; 256 257extern int asan_inited; 258// Used to avoid infinite recursion in __asan_init(). 259extern bool asan_init_is_running; 260 261enum LinkerInitialized { LINKER_INITIALIZED = 0 }; 262 263void NORETURN AsanDie(); 264void SleepForSeconds(int seconds); 265void NORETURN Exit(int exitcode); 266void NORETURN Abort(); 267int Atexit(void (*function)(void)); 268 269#define CHECK(cond) do { if (!(cond)) { \ 270 CheckFailed(#cond, __FILE__, __LINE__); \ 271}}while(0) 272 273#define RAW_CHECK_MSG(expr, msg) do { \ 274 if (!(expr)) { \ 275 RawWrite(msg); \ 276 AsanDie(); \ 277 } \ 278} while (0) 279 280#define RAW_CHECK(expr) RAW_CHECK_MSG(expr, #expr) 281 282#define UNIMPLEMENTED() CHECK("unimplemented" && 0) 283 284#define ASAN_ARRAY_SIZE(a) (sizeof(a)/sizeof((a)[0])) 285 286const size_t kWordSize = __WORDSIZE / 8; 287const size_t kWordSizeInBits = 8 * kWordSize; 288const size_t kPageSizeBits = 12; 289const size_t kPageSize = 1UL << kPageSizeBits; 290 291#ifndef _WIN32 292const size_t kMmapGranularity = kPageSize; 293# define GET_CALLER_PC() (uintptr_t)__builtin_return_address(0) 294# define GET_CURRENT_FRAME() (uintptr_t)__builtin_frame_address(0) 295# define THREAD_CALLING_CONV 296typedef void* thread_return_t; 297#else 298const size_t kMmapGranularity = 1UL << 16; 299# define GET_CALLER_PC() (uintptr_t)_ReturnAddress() 300// CaptureStackBackTrace doesn't need to know BP on Windows. 301// FIXME: This macro is still used when printing error reports though it's not 302// clear if the BP value is needed in the ASan reports on Windows. 303# define GET_CURRENT_FRAME() (uintptr_t)0xDEADBEEF 304# define THREAD_CALLING_CONV __stdcall 305typedef DWORD thread_return_t; 306 307# ifndef ASAN_USE_EXTERNAL_SYMBOLIZER 308# define ASAN_USE_EXTERNAL_SYMBOLIZER __asan::WinSymbolize 309bool WinSymbolize(const void *addr, char *out_buffer, int buffer_size); 310# endif 311#endif 312 313typedef thread_return_t (THREAD_CALLING_CONV *thread_callback_t)(void* arg); 314 315// These magic values are written to shadow for better error reporting. 316const int kAsanHeapLeftRedzoneMagic = 0xfa; 317const int kAsanHeapRightRedzoneMagic = 0xfb; 318const int kAsanHeapFreeMagic = 0xfd; 319const int kAsanStackLeftRedzoneMagic = 0xf1; 320const int kAsanStackMidRedzoneMagic = 0xf2; 321const int kAsanStackRightRedzoneMagic = 0xf3; 322const int kAsanStackPartialRedzoneMagic = 0xf4; 323const int kAsanStackAfterReturnMagic = 0xf5; 324const int kAsanUserPoisonedMemoryMagic = 0xf7; 325const int kAsanGlobalRedzoneMagic = 0xf9; 326const int kAsanInternalHeapMagic = 0xfe; 327 328static const uintptr_t kCurrentStackFrameMagic = 0x41B58AB3; 329static const uintptr_t kRetiredStackFrameMagic = 0x45E0360E; 330 331// --------------------------- Bit twiddling ------- {{{1 332inline bool IsPowerOfTwo(size_t x) { 333 return (x & (x - 1)) == 0; 334} 335 336inline size_t RoundUpTo(size_t size, size_t boundary) { 337 CHECK(IsPowerOfTwo(boundary)); 338 return (size + boundary - 1) & ~(boundary - 1); 339} 340 341// -------------------------- LowLevelAllocator ----- {{{1 342// A simple low-level memory allocator for internal use. 343class LowLevelAllocator { 344 public: 345 explicit LowLevelAllocator(LinkerInitialized) {} 346 // 'size' must be a power of two. 347 // Requires an external lock. 348 void *Allocate(size_t size); 349 private: 350 char *allocated_end_; 351 char *allocated_current_; 352}; 353 354} // namespace __asan 355 356#endif // ASAN_INTERNAL_H 357