libsanitizer/ubsan/ubsan_signals_standalone.cc

   1 //=-- ubsan_signals_standalone.cc
   2 //------------------------------------------------===//
   3 //
   4 // This file is distributed under the University of Illinois Open Source
   5 // License. See LICENSE.TXT for details.
   6 //
   7 //===----------------------------------------------------------------------===//
   8 //
   9 // Installs signal handlers and related interceptors for UBSan standalone.
  10 //
  11 //===----------------------------------------------------------------------===//
  12
  13 #include "ubsan_platform.h"
  14 #if CAN_SANITIZE_UB
  15 #include "interception/interception.h"
  16 #include "sanitizer_common/sanitizer_stacktrace.h"
  17 #include "ubsan_diag.h"
  18 #include "ubsan_init.h"
  19
  20 #define COMMON_INTERCEPT_FUNCTION(name) INTERCEPT_FUNCTION(name)
  21 #include "sanitizer_common/sanitizer_signal_interceptors.inc"
  22
  23 namespace __ubsan {
  24
  25 #if SANITIZER_FUCHSIA
  26 void InitializeDeadlySignals() {}
  27 #else
  28 static void OnStackUnwind(const SignalContext &sig, const void *,
  29                           BufferedStackTrace *stack) {
  30   GetStackTraceWithPcBpAndContext(stack, kStackTraceMax, sig.pc, sig.bp,
  31                                   sig.context,
  32                                   common_flags()->fast_unwind_on_fatal);
  33 }
  34
  35 static void UBsanOnDeadlySignal(int signo, void *siginfo, void *context) {
  36   HandleDeadlySignal(siginfo, context, GetTid(), &OnStackUnwind, nullptr);
  37 }
  38
  39 static bool is_initialized = false;
  40
  41 void InitializeDeadlySignals() {
  42   if (is_initialized)
  43     return;
  44   is_initialized = true;
  45   InitializeSignalInterceptors();
  46   InstallDeadlySignalHandlers(&UBsanOnDeadlySignal);
  47 }
  48 #endif
  49
  50 } // namespace __ubsan
  51
  52 #endif // CAN_SANITIZE_UB