libsanitizer/asan/asan_internal.h

   1 //===-- asan_internal.h -----------------------------------------*- C++ -*-===//
   2 //
   3 // This file is distributed under the University of Illinois Open Source
   4 // License. See LICENSE.TXT for details.
   5 //
   6 //===----------------------------------------------------------------------===//
   7 //
   8 // This file is a part of AddressSanitizer, an address sanity checker.
   9 //
  10 // ASan-private header which defines various general utilities.
  11 //===----------------------------------------------------------------------===//
  12 #ifndef ASAN_INTERNAL_H
  13 #define ASAN_INTERNAL_H
  14
  15 #include "asan_flags.h"
  16 #include "asan_interface_internal.h"
  17 #include "sanitizer_common/sanitizer_common.h"
  18 #include "sanitizer_common/sanitizer_internal_defs.h"
  19 #include "sanitizer_common/sanitizer_stacktrace.h"
  20 #include "sanitizer_common/sanitizer_libc.h"
  21
  22 #define ASAN_DEFAULT_FAILURE_EXITCODE 1
  23
  24 #if __has_feature(address_sanitizer) || defined(__SANITIZE_ADDRESS__)
  25 # error "The AddressSanitizer run-time should not be"
  26         " instrumented by AddressSanitizer"
  27 #endif
  28
  29 // Build-time configuration options.
  30
  31 // If set, asan will intercept C++ exception api call(s).
  32 #ifndef ASAN_HAS_EXCEPTIONS
  33 # define ASAN_HAS_EXCEPTIONS 1
  34 #endif
  35
  36 // If set, values like allocator chunk size, as well as defaults for some flags
  37 // will be changed towards less memory overhead.
  38 #ifndef ASAN_LOW_MEMORY
  39 #if SANITIZER_WORDSIZE == 32
  40 #  define ASAN_LOW_MEMORY 1
  41 #else
  42 #  define ASAN_LOW_MEMORY 0
  43 # endif
  44 #endif
  45
  46 #ifndef ASAN_DYNAMIC
  47 # ifdef PIC
  48 #  define ASAN_DYNAMIC 1
  49 # else
  50 #  define ASAN_DYNAMIC 0
  51 # endif
  52 #endif
  53
  54 // All internal functions in asan reside inside the __asan namespace
  55 // to avoid namespace collisions with the user programs.
  56 // Separate namespace also makes it simpler to distinguish the asan run-time
  57 // functions from the instrumented user code in a profile.
  58 namespace __asan {
  59
  60 class AsanThread;
  61 using __sanitizer::StackTrace;
  62
  63 void AsanInitFromRtl();
  64
  65 // asan_rtl.cc
  66 void NORETURN ShowStatsAndAbort();
  67
  68 // asan_malloc_linux.cc / asan_malloc_mac.cc
  69 void ReplaceSystemMalloc();
  70
  71 // asan_linux.cc / asan_mac.cc / asan_win.cc
  72 void *AsanDoesNotSupportStaticLinkage();
  73 void AsanCheckDynamicRTPrereqs();
  74 void AsanCheckIncompatibleRT();
  75
  76 void GetPcSpBp(void *context, uptr *pc, uptr *sp, uptr *bp);
  77 void AsanOnSIGSEGV(int, void *siginfo, void *context);
  78
  79 void MaybeReexec();
  80 bool AsanInterceptsSignal(int signum);
  81 void ReadContextStack(void *context, uptr *stack, uptr *ssize);
  82 void AsanPlatformThreadInit();
  83 void StopInitOrderChecking();
  84
  85 // Wrapper for TLS/TSD.
  86 void AsanTSDInit(void (*destructor)(void *tsd));
  87 void *AsanTSDGet();
  88 void AsanTSDSet(void *tsd);
  89 void PlatformTSDDtor(void *tsd);
  90
  91 void AppendToErrorMessageBuffer(const char *buffer);
  92
  93 void ParseExtraActivationFlags();
  94
  95 void *AsanDlSymNext(const char *sym);
  96
  97 // Platform-specific options.
  98 #if SANITIZER_MAC
  99 bool PlatformHasDifferentMemcpyAndMemmove();
 100 # define PLATFORM_HAS_DIFFERENT_MEMCPY_AND_MEMMOVE \
 101     (PlatformHasDifferentMemcpyAndMemmove())
 102 #else
 103 # define PLATFORM_HAS_DIFFERENT_MEMCPY_AND_MEMMOVE true
 104 #endif  // SANITIZER_MAC
 105
 106 // Add convenient macro for interface functions that may be represented as
 107 // weak hooks.
 108 #define ASAN_MALLOC_HOOK(ptr, size) \
 109   if (&__sanitizer_malloc_hook) __sanitizer_malloc_hook(ptr, size)
 110 #define ASAN_FREE_HOOK(ptr) \
 111   if (&__sanitizer_free_hook) __sanitizer_free_hook(ptr)
 112 #define ASAN_ON_ERROR() \
 113   if (&__asan_on_error) __asan_on_error()
 114
 115 extern int asan_inited;
 116 // Used to avoid infinite recursion in __asan_init().
 117 extern bool asan_init_is_running;
 118 extern void (*death_callback)(void);
 119
 120 // These magic values are written to shadow for better error reporting.
 121 const int kAsanHeapLeftRedzoneMagic = 0xfa;
 122 const int kAsanHeapRightRedzoneMagic = 0xfb;
 123 const int kAsanHeapFreeMagic = 0xfd;
 124 const int kAsanStackLeftRedzoneMagic = 0xf1;
 125 const int kAsanStackMidRedzoneMagic = 0xf2;
 126 const int kAsanStackRightRedzoneMagic = 0xf3;
 127 const int kAsanStackPartialRedzoneMagic = 0xf4;
 128 const int kAsanStackAfterReturnMagic = 0xf5;
 129 const int kAsanInitializationOrderMagic = 0xf6;
 130 const int kAsanUserPoisonedMemoryMagic = 0xf7;
 131 const int kAsanContiguousContainerOOBMagic = 0xfc;
 132 const int kAsanStackUseAfterScopeMagic = 0xf8;
 133 const int kAsanGlobalRedzoneMagic = 0xf9;
 134 const int kAsanInternalHeapMagic = 0xfe;
 135 const int kAsanArrayCookieMagic = 0xac;
 136 const int kAsanIntraObjectRedzone = 0xbb;
 137
 138 static const uptr kCurrentStackFrameMagic = 0x41B58AB3;
 139 static const uptr kRetiredStackFrameMagic = 0x45E0360E;
 140
 141 }  // namespace __asan
 142
 143 #endif  // ASAN_INTERNAL_H