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1 //===-- asan_win_dynamic_runtime_thunk.cc ---------------------------------===//
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2 //
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3 // This file is distributed under the University of Illinois Open Source
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4 // License. See LICENSE.TXT for details.
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5 //
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6 //===----------------------------------------------------------------------===//
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7 //
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8 // This file is a part of AddressSanitizer, an address sanity checker.
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9 //
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10 // This file defines things that need to be present in the application modules
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11 // to interact with the ASan DLL runtime correctly and can't be implemented
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12 // using the default "import library" generated when linking the DLL RTL.
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13 //
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14 // This includes:
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15 // - creating weak aliases to default implementation imported from asan dll.
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16 // - forwarding the detect_stack_use_after_return runtime option
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17 // - working around deficiencies of the MD runtime
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18 // - installing a custom SEH handler
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19 //
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20 //===----------------------------------------------------------------------===//
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21
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22 #ifdef SANITIZER_DYNAMIC_RUNTIME_THUNK
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23 #define SANITIZER_IMPORT_INTERFACE 1
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24 #include "sanitizer_common/sanitizer_win_defs.h"
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25 #define WIN32_LEAN_AND_MEAN
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26 #include <windows.h>
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27
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28 // Define weak alias for all weak functions imported from asan dll.
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29 #define INTERFACE_FUNCTION(Name)
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30 #define INTERFACE_WEAK_FUNCTION(Name) WIN_WEAK_IMPORT_DEF(Name)
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31 #include "asan_interface.inc"
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32
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33 // First, declare CRT sections we'll be using in this file
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34 #pragma section(".CRT$XIB", long, read) // NOLINT
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35 #pragma section(".CRT$XID", long, read) // NOLINT
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36 #pragma section(".CRT$XCAB", long, read) // NOLINT
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37 #pragma section(".CRT$XTW", long, read) // NOLINT
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38 #pragma section(".CRT$XTY", long, read) // NOLINT
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39 #pragma section(".CRT$XLAB", long, read) // NOLINT
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40
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41 ////////////////////////////////////////////////////////////////////////////////
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42 // Define a copy of __asan_option_detect_stack_use_after_return that should be
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43 // used when linking an MD runtime with a set of object files on Windows.
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44 //
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45 // The ASan MD runtime dllexports '__asan_option_detect_stack_use_after_return',
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46 // so normally we would just dllimport it. Unfortunately, the dllimport
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47 // attribute adds __imp_ prefix to the symbol name of a variable.
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48 // Since in general we don't know if a given TU is going to be used
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49 // with a MT or MD runtime and we don't want to use ugly __imp_ names on Windows
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50 // just to work around this issue, let's clone the variable that is constant
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51 // after initialization anyways.
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52 extern "C" {
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53 __declspec(dllimport) int __asan_should_detect_stack_use_after_return();
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54 int __asan_option_detect_stack_use_after_return;
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55
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56 __declspec(dllimport) void* __asan_get_shadow_memory_dynamic_address();
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57 void* __asan_shadow_memory_dynamic_address;
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58 }
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59
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60 static int InitializeClonedVariables() {
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61 __asan_option_detect_stack_use_after_return =
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62 __asan_should_detect_stack_use_after_return();
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63 __asan_shadow_memory_dynamic_address =
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64 __asan_get_shadow_memory_dynamic_address();
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65 return 0;
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66 }
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67
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68 static void NTAPI asan_thread_init(void *mod, unsigned long reason,
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69 void *reserved) {
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70 if (reason == DLL_PROCESS_ATTACH) InitializeClonedVariables();
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71 }
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72
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73 // Our cloned variables must be initialized before C/C++ constructors. If TLS
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74 // is used, our .CRT$XLAB initializer will run first. If not, our .CRT$XIB
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75 // initializer is needed as a backup.
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76 __declspec(allocate(".CRT$XIB")) int (*__asan_initialize_cloned_variables)() =
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77 InitializeClonedVariables;
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78 __declspec(allocate(".CRT$XLAB")) void (NTAPI *__asan_tls_init)(void *,
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79 unsigned long, void *) = asan_thread_init;
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80
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81 ////////////////////////////////////////////////////////////////////////////////
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82 // For some reason, the MD CRT doesn't call the C/C++ terminators during on DLL
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83 // unload or on exit. ASan relies on LLVM global_dtors to call
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84 // __asan_unregister_globals on these events, which unfortunately doesn't work
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85 // with the MD runtime, see PR22545 for the details.
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86 // To work around this, for each DLL we schedule a call to UnregisterGlobals
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87 // using atexit() that calls a small subset of C terminators
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88 // where LLVM global_dtors is placed. Fingers crossed, no other C terminators
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89 // are there.
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90 extern "C" int __cdecl atexit(void (__cdecl *f)(void));
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91 extern "C" void __cdecl _initterm(void *a, void *b);
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92
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93 namespace {
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94 __declspec(allocate(".CRT$XTW")) void* before_global_dtors = 0;
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95 __declspec(allocate(".CRT$XTY")) void* after_global_dtors = 0;
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96
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97 void UnregisterGlobals() {
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98 _initterm(&before_global_dtors, &after_global_dtors);
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99 }
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100
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101 int ScheduleUnregisterGlobals() {
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102 return atexit(UnregisterGlobals);
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103 }
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104 } // namespace
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105
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106 // We need to call 'atexit(UnregisterGlobals);' as early as possible, but after
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107 // atexit() is initialized (.CRT$XIC). As this is executed before C++
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108 // initializers (think ctors for globals), UnregisterGlobals gets executed after
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109 // dtors for C++ globals.
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110 __declspec(allocate(".CRT$XID"))
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111 int (*__asan_schedule_unregister_globals)() = ScheduleUnregisterGlobals;
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112
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113 ////////////////////////////////////////////////////////////////////////////////
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114 // ASan SEH handling.
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115 // We need to set the ASan-specific SEH handler at the end of CRT initialization
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116 // of each module (see also asan_win.cc).
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117 extern "C" {
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118 __declspec(dllimport) int __asan_set_seh_filter();
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119 static int SetSEHFilter() { return __asan_set_seh_filter(); }
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120
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121 // Unfortunately, putting a pointer to __asan_set_seh_filter into
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122 // __asan_intercept_seh gets optimized out, so we have to use an extra function.
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123 __declspec(allocate(".CRT$XCAB")) int (*__asan_seh_interceptor)() =
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124 SetSEHFilter;
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125 }
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126
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127 WIN_FORCE_LINK(__asan_dso_reg_hook)
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128
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129 #endif // SANITIZER_DYNAMIC_RUNTIME_THUNK
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