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 "asan_interface_internal.h"
19 #include "sanitizer_common/sanitizer_common.h"
20 #include "sanitizer_common/sanitizer_internal_defs.h"
21 #include "sanitizer_common/sanitizer_stacktrace.h"
22 #include "sanitizer_common/sanitizer_libc.h"
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 AsanOnDeadlySignal(int, void *siginfo, void *context);
77 
78 void ReadContextStack(void *context, uptr *stack, uptr *ssize);
79 void StopInitOrderChecking();
80 
81 // Wrapper for TLS/TSD.
82 void AsanTSDInit(void (*destructor)(void *tsd));
83 void *AsanTSDGet();
84 void AsanTSDSet(void *tsd);
85 void PlatformTSDDtor(void *tsd);
86 
87 void AppendToErrorMessageBuffer(const char *buffer);
88 
89 void *AsanDlSymNext(const char *sym);
90 
91 void ReserveShadowMemoryRange(uptr beg, uptr end, const char *name);
92 
93 // Platform-specific options.
94 #if SANITIZER_MAC
95 bool PlatformHasDifferentMemcpyAndMemmove();
96 # define PLATFORM_HAS_DIFFERENT_MEMCPY_AND_MEMMOVE \
97     (PlatformHasDifferentMemcpyAndMemmove())
98 #else
99 # define PLATFORM_HAS_DIFFERENT_MEMCPY_AND_MEMMOVE true
100 #endif  // SANITIZER_MAC
101 
102 // Add convenient macro for interface functions that may be represented as
103 // weak hooks.
104 #define ASAN_MALLOC_HOOK(ptr, size) \
105   if (&__sanitizer_malloc_hook) __sanitizer_malloc_hook(ptr, size)
106 #define ASAN_FREE_HOOK(ptr) \
107   if (&__sanitizer_free_hook) __sanitizer_free_hook(ptr)
108 #define ASAN_ON_ERROR() \
109   if (&__asan_on_error) __asan_on_error()
110 
111 extern int asan_inited;
112 // Used to avoid infinite recursion in __asan_init().
113 extern bool asan_init_is_running;
114 extern void (*death_callback)(void);
115 
116 // These magic values are written to shadow for better error reporting.
117 const int kAsanHeapLeftRedzoneMagic = 0xfa;
118 const int kAsanHeapRightRedzoneMagic = 0xfb;
119 const int kAsanHeapFreeMagic = 0xfd;
120 const int kAsanStackLeftRedzoneMagic = 0xf1;
121 const int kAsanStackMidRedzoneMagic = 0xf2;
122 const int kAsanStackRightRedzoneMagic = 0xf3;
123 const int kAsanStackPartialRedzoneMagic = 0xf4;
124 const int kAsanStackAfterReturnMagic = 0xf5;
125 const int kAsanInitializationOrderMagic = 0xf6;
126 const int kAsanUserPoisonedMemoryMagic = 0xf7;
127 const int kAsanContiguousContainerOOBMagic = 0xfc;
128 const int kAsanStackUseAfterScopeMagic = 0xf8;
129 const int kAsanGlobalRedzoneMagic = 0xf9;
130 const int kAsanInternalHeapMagic = 0xfe;
131 const int kAsanArrayCookieMagic = 0xac;
132 const int kAsanIntraObjectRedzone = 0xbb;
133 const int kAsanAllocaLeftMagic = 0xca;
134 const int kAsanAllocaRightMagic = 0xcb;
135 
136 static const uptr kCurrentStackFrameMagic = 0x41B58AB3;
137 static const uptr kRetiredStackFrameMagic = 0x45E0360E;
138 
139 }  // namespace __asan
140 
141 #endif  // ASAN_INTERNAL_H
142