libsanitizer/sanitizer_common/sanitizer_symbolizer_win.cc

   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