1 //===-- asan_malloc_win.cc ------------------------------------------------===// 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 // Windows-specific malloc interception. 13 //===----------------------------------------------------------------------===// 14 15 #include "sanitizer_common/sanitizer_platform.h" 16 #if SANITIZER_WINDOWS 17 18 #include "asan_allocator.h" 19 #include "asan_interceptors.h" 20 #include "asan_internal.h" 21 #include "asan_stack.h" 22 #include "interception/interception.h" 23 24 #include <stddef.h> 25 26 // ---------------------- Replacement functions ---------------- {{{1 27 using namespace __asan; // NOLINT 28 29 // FIXME: Simply defining functions with the same signature in *.obj 30 // files overrides the standard functions in *.lib 31 // This works well for simple helloworld-like tests but might need to be 32 // revisited in the future. 33 34 extern "C" { 35 void free(void *ptr) { 36 GET_STACK_TRACE_FREE; 37 return asan_free(ptr, &stack, FROM_MALLOC); 38 } 39 40 void _free_dbg(void* ptr, int) { 41 free(ptr); 42 } 43 44 void cfree(void *ptr) { 45 CHECK(!"cfree() should not be used on Windows?"); 46 } 47 48 void *malloc(size_t size) { 49 GET_STACK_TRACE_MALLOC; 50 return asan_malloc(size, &stack); 51 } 52 53 void* _malloc_dbg(size_t size, int , const char*, int) { 54 return malloc(size); 55 } 56 57 void *calloc(size_t nmemb, size_t size) { 58 GET_STACK_TRACE_MALLOC; 59 return asan_calloc(nmemb, size, &stack); 60 } 61 62 void* _calloc_dbg(size_t n, size_t size, int, const char*, int) { 63 return calloc(n, size); 64 } 65 66 void *_calloc_impl(size_t nmemb, size_t size, int *errno_tmp) { 67 return calloc(nmemb, size); 68 } 69 70 void *realloc(void *ptr, size_t size) { 71 GET_STACK_TRACE_MALLOC; 72 return asan_realloc(ptr, size, &stack); 73 } 74 75 void *_realloc_dbg(void *ptr, size_t size, int) { 76 CHECK(!"_realloc_dbg should not exist!"); 77 return 0; 78 } 79 80 void* _recalloc(void* p, size_t n, size_t elem_size) { 81 if (!p) 82 return calloc(n, elem_size); 83 const size_t size = n * elem_size; 84 if (elem_size != 0 && size / elem_size != n) 85 return 0; 86 return realloc(p, size); 87 } 88 89 size_t _msize(void *ptr) { 90 GET_STACK_TRACE_MALLOC; 91 return asan_malloc_usable_size(ptr, &stack); 92 } 93 94 int _CrtDbgReport(int, const char*, int, 95 const char*, const char*, ...) { 96 ShowStatsAndAbort(); 97 } 98 99 int _CrtDbgReportW(int reportType, const wchar_t*, int, 100 const wchar_t*, const wchar_t*, ...) { 101 ShowStatsAndAbort(); 102 } 103 104 int _CrtSetReportMode(int, int) { 105 return 0; 106 } 107 } // extern "C" 108 109 using __interception::GetRealFunctionAddress; 110 111 // We don't want to include "windows.h" in this file to avoid extra attributes 112 // set on malloc/free etc (e.g. dllimport), so declare a few things manually: 113 extern "C" int __stdcall VirtualProtect(void* addr, size_t size, 114 DWORD prot, DWORD *old_prot); 115 const int PAGE_EXECUTE_READWRITE = 0x40; 116 117 namespace __asan { 118 void ReplaceSystemMalloc() { 119 #if defined(_DLL) 120 # ifdef _WIN64 121 # error ReplaceSystemMalloc was not tested on x64 122 # endif 123 char *crt_malloc; 124 if (GetRealFunctionAddress("malloc", (void**)&crt_malloc)) { 125 // Replace malloc in the CRT dll with a jump to our malloc. 126 DWORD old_prot, unused; 127 CHECK(VirtualProtect(crt_malloc, 16, PAGE_EXECUTE_READWRITE, &old_prot)); 128 REAL(memset)(crt_malloc, 0xCC /* int 3 */, 16); // just in case. 129 130 ptrdiff_t jmp_offset = (char*)malloc - (char*)crt_malloc - 5; 131 crt_malloc[0] = 0xE9; // jmp, should be followed by an offset. 132 REAL(memcpy)(crt_malloc + 1, &jmp_offset, sizeof(jmp_offset)); 133 134 CHECK(VirtualProtect(crt_malloc, 16, old_prot, &unused)); 135 136 // FYI: FlushInstructionCache is needed on Itanium etc but not on x86/x64. 137 } 138 139 // FIXME: investigate whether anything else is needed. 140 #endif 141 } 142 } // namespace __asan 143 144 #endif // _WIN32 145
