1 //===-- sanitizer_symbolizer_win.cc ---------------------------------------===// 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 shared between AddressSanitizer and ThreadSanitizer 9 // run-time libraries. 10 // Windows-specific implementation of symbolizer parts. 11 //===----------------------------------------------------------------------===// 12 13 #include "sanitizer_platform.h" 14 #if SANITIZER_WINDOWS 15 16 #include "sanitizer_dbghelp.h" 17 #include "sanitizer_symbolizer_internal.h" 18 19 namespace __sanitizer { 20 21 decltype(::StackWalk64) *StackWalk64; 22 decltype(::SymCleanup) *SymCleanup; 23 decltype(::SymFromAddr) *SymFromAddr; 24 decltype(::SymFunctionTableAccess64) *SymFunctionTableAccess64; 25 decltype(::SymGetLineFromAddr64) *SymGetLineFromAddr64; 26 decltype(::SymGetModuleBase64) *SymGetModuleBase64; 27 decltype(::SymGetSearchPathW) *SymGetSearchPathW; 28 decltype(::SymInitialize) *SymInitialize; 29 decltype(::SymSetOptions) *SymSetOptions; 30 decltype(::SymSetSearchPathW) *SymSetSearchPathW; 31 decltype(::UnDecorateSymbolName) *UnDecorateSymbolName; 32 33 namespace { 34 35 class WinSymbolizerTool : public SymbolizerTool { 36 public: 37 bool SymbolizePC(uptr addr, SymbolizedStack *stack) override; 38 bool SymbolizeData(uptr addr, DataInfo *info) override { 39 return false; 40 } 41 const char *Demangle(const char *name) override; 42 }; 43 44 bool is_dbghelp_initialized = false; 45 46 bool TrySymInitialize() { 47 SymSetOptions(SYMOPT_DEFERRED_LOADS | SYMOPT_UNDNAME | SYMOPT_LOAD_LINES); 48 return SymInitialize(GetCurrentProcess(), 0, TRUE); 49 // FIXME: We don't call SymCleanup() on exit yet - should we? 50 } 51 52 } // namespace 53 54 // Initializes DbgHelp library, if it's not yet initialized. Calls to this 55 // function should be synchronized with respect to other calls to DbgHelp API 56 // (e.g. from WinSymbolizerTool). 57 void InitializeDbgHelpIfNeeded() { 58 if (is_dbghelp_initialized) 59 return; 60 61 HMODULE dbghelp = LoadLibraryA("dbghelp.dll"); 62 CHECK(dbghelp && "failed to load dbghelp.dll"); 63 64 #define DBGHELP_IMPORT(name) \ 65 do { \ 66 name = \ 67 reinterpret_cast<decltype(::name) *>(GetProcAddress(dbghelp, #name)); \ 68 CHECK(name != nullptr); \ 69 } while (0) 70 DBGHELP_IMPORT(StackWalk64); 71 DBGHELP_IMPORT(SymCleanup); 72 DBGHELP_IMPORT(SymFromAddr); 73 DBGHELP_IMPORT(SymFunctionTableAccess64); 74 DBGHELP_IMPORT(SymGetLineFromAddr64); 75 DBGHELP_IMPORT(SymGetModuleBase64); 76 DBGHELP_IMPORT(SymGetSearchPathW); 77 DBGHELP_IMPORT(SymInitialize); 78 DBGHELP_IMPORT(SymSetOptions); 79 DBGHELP_IMPORT(SymSetSearchPathW); 80 DBGHELP_IMPORT(UnDecorateSymbolName); 81 #undef DBGHELP_IMPORT 82 83 if (!TrySymInitialize()) { 84 // OK, maybe the client app has called SymInitialize already. 85 // That's a bit unfortunate for us as all the DbgHelp functions are 86 // single-threaded and we can't coordinate with the app. 87 // FIXME: Can we stop the other threads at this point? 88 // Anyways, we have to reconfigure stuff to make sure that SymInitialize 89 // has all the appropriate options set. 90 // Cross our fingers and reinitialize DbgHelp. 91 Report("*** WARNING: Failed to initialize DbgHelp! ***\n"); 92 Report("*** Most likely this means that the app is already ***\n"); 93 Report("*** using DbgHelp, possibly with incompatible flags. ***\n"); 94 Report("*** Due to technical reasons, symbolization might crash ***\n"); 95 Report("*** or produce wrong results. ***\n"); 96 SymCleanup(GetCurrentProcess()); 97 TrySymInitialize(); 98 } 99 is_dbghelp_initialized = true; 100 101 // When an executable is run from a location different from the one where it 102 // was originally built, we may not see the nearby PDB files. 103 // To work around this, let's append the directory of the main module 104 // to the symbol search path. All the failures below are not fatal. 105 const size_t kSymPathSize = 2048; 106 static wchar_t path_buffer[kSymPathSize + 1 + MAX_PATH]; 107 if (!SymGetSearchPathW(GetCurrentProcess(), path_buffer, kSymPathSize)) { 108 Report("*** WARNING: Failed to SymGetSearchPathW ***\n"); 109 return; 110 } 111 size_t sz = wcslen(path_buffer); 112 if (sz) { 113 CHECK_EQ(0, wcscat_s(path_buffer, L";")); 114 sz++; 115 } 116 DWORD res = GetModuleFileNameW(NULL, path_buffer + sz, MAX_PATH); 117 if (res == 0 || res == MAX_PATH) { 118 Report("*** WARNING: Failed to getting the EXE directory ***\n"); 119 return; 120 } 121 // Write the zero character in place of the last backslash to get the 122 // directory of the main module at the end of path_buffer. 123 wchar_t *last_bslash = wcsrchr(path_buffer + sz, L'\\'); 124 CHECK_NE(last_bslash, 0); 125 *last_bslash = L'\0'; 126 if (!SymSetSearchPathW(GetCurrentProcess(), path_buffer)) { 127 Report("*** WARNING: Failed to SymSetSearchPathW\n"); 128 return; 129 } 130 } 131 132 bool WinSymbolizerTool::SymbolizePC(uptr addr, SymbolizedStack *frame) { 133 InitializeDbgHelpIfNeeded(); 134 135 // See http://msdn.microsoft.com/en-us/library/ms680578(VS.85).aspx 136 char buffer[sizeof(SYMBOL_INFO) + MAX_SYM_NAME * sizeof(CHAR)]; 137 PSYMBOL_INFO symbol = (PSYMBOL_INFO)buffer; 138 symbol->SizeOfStruct = sizeof(SYMBOL_INFO); 139 symbol->MaxNameLen = MAX_SYM_NAME; 140 DWORD64 offset = 0; 141 BOOL got_objname = SymFromAddr(GetCurrentProcess(), 142 (DWORD64)addr, &offset, symbol); 143 if (!got_objname) 144 return false; 145 146 DWORD unused; 147 IMAGEHLP_LINE64 line_info; 148 line_info.SizeOfStruct = sizeof(IMAGEHLP_LINE64); 149 BOOL got_fileline = SymGetLineFromAddr64(GetCurrentProcess(), (DWORD64)addr, 150 &unused, &line_info); 151 frame->info.function = internal_strdup(symbol->Name); 152 frame->info.function_offset = (uptr)offset; 153 if (got_fileline) { 154 frame->info.file = internal_strdup(line_info.FileName); 155 frame->info.line = line_info.LineNumber; 156 } 157 // Only consider this a successful symbolization attempt if we got file info. 158 // Otherwise, try llvm-symbolizer. 159 return got_fileline; 160 } 161 162 const char *WinSymbolizerTool::Demangle(const char *name) { 163 CHECK(is_dbghelp_initialized); 164 static char demangle_buffer[1000]; 165 if (name[0] == '\01' && 166 UnDecorateSymbolName(name + 1, demangle_buffer, sizeof(demangle_buffer), 167 UNDNAME_NAME_ONLY)) 168 return demangle_buffer; 169 else 170 return name; 171 } 172 173 const char *Symbolizer::PlatformDemangle(const char *name) { 174 return name; 175 } 176 177 void Symbolizer::PlatformPrepareForSandboxing() { 178 // Do nothing. 179 } 180 181 namespace { 182 struct ScopedHandle { 183 ScopedHandle() : h_(nullptr) {} 184 explicit ScopedHandle(HANDLE h) : h_(h) {} 185 ~ScopedHandle() { 186 if (h_) 187 ::CloseHandle(h_); 188 } 189 HANDLE get() { return h_; } 190 HANDLE *receive() { return &h_; } 191 HANDLE release() { 192 HANDLE h = h_; 193 h_ = nullptr; 194 return h; 195 } 196 HANDLE h_; 197 }; 198 } // namespace 199 200 bool SymbolizerProcess::StartSymbolizerSubprocess() { 201 // Create inherited pipes for stdin and stdout. 202 ScopedHandle stdin_read, stdin_write; 203 ScopedHandle stdout_read, stdout_write; 204 SECURITY_ATTRIBUTES attrs; 205 attrs.nLength = sizeof(SECURITY_ATTRIBUTES); 206 attrs.bInheritHandle = TRUE; 207 attrs.lpSecurityDescriptor = nullptr; 208 if (!::CreatePipe(stdin_read.receive(), stdin_write.receive(), &attrs, 0) || 209 !::CreatePipe(stdout_read.receive(), stdout_write.receive(), &attrs, 0)) { 210 VReport(2, "WARNING: %s CreatePipe failed (error code: %d)\n", 211 SanitizerToolName, path_, GetLastError()); 212 return false; 213 } 214 215 // Don't inherit the writing end of stdin or the reading end of stdout. 216 if (!SetHandleInformation(stdin_write.get(), HANDLE_FLAG_INHERIT, 0) || 217 !SetHandleInformation(stdout_read.get(), HANDLE_FLAG_INHERIT, 0)) { 218 VReport(2, "WARNING: %s SetHandleInformation failed (error code: %d)\n", 219 SanitizerToolName, path_, GetLastError()); 220 return false; 221 } 222 223 // Compute the command line. Wrap double quotes around everything. 224 const char *argv[kArgVMax]; 225 GetArgV(path_, argv); 226 InternalScopedString command_line(kMaxPathLength * 3); 227 for (int i = 0; argv[i]; i++) { 228 const char *arg = argv[i]; 229 int arglen = internal_strlen(arg); 230 // Check that tool command lines are simple and that complete escaping is 231 // unnecessary. 232 CHECK(!internal_strchr(arg, '"') && "quotes in args unsupported"); 233 CHECK(!internal_strstr(arg, "\\\\") && 234 "double backslashes in args unsupported"); 235 CHECK(arglen > 0 && arg[arglen - 1] != '\\' && 236 "args ending in backslash and empty args unsupported"); 237 command_line.append("\"%s\" ", arg); 238 } 239 VReport(3, "Launching symbolizer command: %s\n", command_line.data()); 240 241 // Launch llvm-symbolizer with stdin and stdout redirected. 242 STARTUPINFOA si; 243 memset(&si, 0, sizeof(si)); 244 si.cb = sizeof(si); 245 si.dwFlags |= STARTF_USESTDHANDLES; 246 si.hStdInput = stdin_read.get(); 247 si.hStdOutput = stdout_write.get(); 248 PROCESS_INFORMATION pi; 249 memset(&pi, 0, sizeof(pi)); 250 if (!CreateProcessA(path_, // Executable 251 command_line.data(), // Command line 252 nullptr, // Process handle not inheritable 253 nullptr, // Thread handle not inheritable 254 TRUE, // Set handle inheritance to TRUE 255 0, // Creation flags 256 nullptr, // Use parent's environment block 257 nullptr, // Use parent's starting directory 258 &si, &pi)) { 259 VReport(2, "WARNING: %s failed to create process for %s (error code: %d)\n", 260 SanitizerToolName, path_, GetLastError()); 261 return false; 262 } 263 264 // Process creation succeeded, so transfer handle ownership into the fields. 265 input_fd_ = stdout_read.release(); 266 output_fd_ = stdin_write.release(); 267 268 // The llvm-symbolizer process is responsible for quitting itself when the 269 // stdin pipe is closed, so we don't need these handles. Close them to prevent 270 // leaks. If we ever want to try to kill the symbolizer process from the 271 // parent, we'll want to hang on to these handles. 272 CloseHandle(pi.hProcess); 273 CloseHandle(pi.hThread); 274 return true; 275 } 276 277 static void ChooseSymbolizerTools(IntrusiveList<SymbolizerTool> *list, 278 LowLevelAllocator *allocator) { 279 if (!common_flags()->symbolize) { 280 VReport(2, "Symbolizer is disabled.\n"); 281 return; 282 } 283 284 // Add llvm-symbolizer in case the binary has dwarf. 285 const char *user_path = common_flags()->external_symbolizer_path; 286 const char *path = 287 user_path ? user_path : FindPathToBinary("llvm-symbolizer.exe"); 288 if (path) { 289 VReport(2, "Using llvm-symbolizer at %spath: %s\n", 290 user_path ? "user-specified " : "", path); 291 list->push_back(new(*allocator) LLVMSymbolizer(path, allocator)); 292 } else { 293 if (user_path && user_path[0] == '\0') { 294 VReport(2, "External symbolizer is explicitly disabled.\n"); 295 } else { 296 VReport(2, "External symbolizer is not present.\n"); 297 } 298 } 299 300 // Add the dbghelp based symbolizer. 301 list->push_back(new(*allocator) WinSymbolizerTool()); 302 } 303 304 Symbolizer *Symbolizer::PlatformInit() { 305 IntrusiveList<SymbolizerTool> list; 306 list.clear(); 307 ChooseSymbolizerTools(&list, &symbolizer_allocator_); 308 309 return new(symbolizer_allocator_) Symbolizer(list); 310 } 311 312 void Symbolizer::LateInitialize() { 313 Symbolizer::GetOrInit(); 314 } 315 316 } // namespace __sanitizer 317 318 #endif // _WIN32 319