[sanitizer] Move signal interceptors from asan to sanitizer_common

Summary: Part of google/sanitizers#637

Reviewers: eugenis, alekseyshl

Subscribers: srhines, kubamracek, llvm-commits

Differential Revision: https://reviews.llvm.org/D37889

llvm-svn: 313449

compiler-rt/lib/asan/asan_interceptors.cc

@@ -161,6 +161,7 @@ DECLARE_REAL_AND_INTERCEPTOR(void, free, void *)
   } while (false)
 
 #include "sanitizer_common/sanitizer_common_interceptors.inc"
+#include "sanitizer_common/sanitizer_signal_interceptors.inc"
 
 // Syscall interceptors don't have contexts, we don't support suppressions
 // for them.
@@ -242,42 +243,6 @@ INTERCEPTOR(int, pthread_join, void *t, void **arg) {
 DEFINE_REAL_PTHREAD_FUNCTIONS
 #endif  // ASAN_INTERCEPT_PTHREAD_CREATE
 
-#if ASAN_INTERCEPT_SIGNAL_AND_SIGACTION
-
-#if SANITIZER_ANDROID
-INTERCEPTOR(void*, bsd_signal, int signum, void *handler) {
-  if (GetHandleSignalMode(signum) != kHandleSignalExclusive)
-    return REAL(bsd_signal)(signum, handler);
-  return 0;
-}
-#endif
-
-INTERCEPTOR(void*, signal, int signum, void *handler) {
-  if (GetHandleSignalMode(signum) != kHandleSignalExclusive)
-    return REAL(signal)(signum, handler);
-  return nullptr;
-}
-
-INTERCEPTOR(int, sigaction, int signum, const struct sigaction *act,
-                            struct sigaction *oldact) {
-  if (GetHandleSignalMode(signum) != kHandleSignalExclusive)
-    return REAL(sigaction)(signum, act, oldact);
-  return 0;
-}
-
-namespace __sanitizer {
-int real_sigaction(int signum, const void *act, void *oldact) {
-  return REAL(sigaction)(signum, (const struct sigaction *)act,
-                         (struct sigaction *)oldact);
-}
-} // namespace __sanitizer
-
-#elif SANITIZER_POSIX
-// We need to have defined REAL(sigaction) on posix systems.
-DEFINE_REAL(int, sigaction, int signum, const struct sigaction *act,
-    struct sigaction *oldact)
-#endif  // ASAN_INTERCEPT_SIGNAL_AND_SIGACTION
-
 #if ASAN_INTERCEPT_SWAPCONTEXT
 static void ClearShadowMemoryForContextStack(uptr stack, uptr ssize) {
   // Align to page size.
@@ -590,6 +555,7 @@ void InitializeAsanInterceptors() {
   CHECK(!was_called_once);
   was_called_once = true;
   InitializeCommonInterceptors();
+  InitializeSignalInterceptors();
 
   // Intercept str* functions.
   ASAN_INTERCEPT_FUNC(strcat);  // NOLINT
@@ -612,15 +578,9 @@ void InitializeAsanInterceptors() {
   ASAN_INTERCEPT_FUNC(strtoll);
 #endif
 
-  // Intecept signal- and jump-related functions.
+  // Intecept jump-related functions.
   ASAN_INTERCEPT_FUNC(longjmp);
-#if ASAN_INTERCEPT_SIGNAL_AND_SIGACTION
-  ASAN_INTERCEPT_FUNC(sigaction);
-#if SANITIZER_ANDROID
-  ASAN_INTERCEPT_FUNC(bsd_signal);
-#endif
-  ASAN_INTERCEPT_FUNC(signal);
-#endif
+
 #if ASAN_INTERCEPT_SWAPCONTEXT
   ASAN_INTERCEPT_FUNC(swapcontext);
 #endif

compiler-rt/lib/asan/asan_interceptors.h

@@ -67,12 +67,6 @@ void InitializePlatformInterceptors();
 # define ASAN_INTERCEPT_SWAPCONTEXT 0
 #endif
 
-#if !SANITIZER_WINDOWS
-# define ASAN_INTERCEPT_SIGNAL_AND_SIGACTION 1
-#else
-# define ASAN_INTERCEPT_SIGNAL_AND_SIGACTION 0
-#endif
-
 #if !SANITIZER_WINDOWS
 # define ASAN_INTERCEPT_SIGLONGJMP 1
 #else

compiler-rt/lib/sanitizer_common/sanitizer_platform_interceptors.h

@@ -389,5 +389,7 @@
 #define SANITIZER_INTERCEPT_MALLOC_USABLE_SIZE (!SI_MAC)
 #define SANITIZER_INTERCEPT_MCHECK_MPROBE SI_LINUX_NOT_ANDROID
 #define SANITIZER_INTERCEPT_WCSCAT SI_POSIX
+#define SANITIZER_INTERCEPT_SIGNAL_AND_SIGACTION (!SANITIZER_WINDOWS)
+#define SANITIZER_INTERCEPT_BSD_SIGNAL SANITIZER_ANDROID
 
 #endif  // #ifndef SANITIZER_PLATFORM_INTERCEPTORS_H

compiler-rt/lib/sanitizer_common/sanitizer_signal_interceptors.inc

@@ -0,0 +1,67 @@
+//===-- sanitizer_signal_interceptors.inc -----------------------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// Signal interceptors for sanitizers.
+//
+//===----------------------------------------------------------------------===//
+
+#include "interception/interception.h"
+#include "sanitizer_common.h"
+#include "sanitizer_internal_defs.h"
+#include "sanitizer_platform_interceptors.h"
+
+using namespace __sanitizer;
+
+#if SANITIZER_INTERCEPT_BSD_SIGNAL
+INTERCEPTOR(void *, bsd_signal, int signum, void *handler) {
+  if (GetHandleSignalMode(signum) == kHandleSignalExclusive) return 0;
+  return REAL(bsd_signal)(signum, handler);
+}
+#define INIT_BSD_SIGNAL COMMON_INTERCEPT_FUNCTION(bsd_signal)
+#else  // SANITIZER_INTERCEPT_BSD_SIGNAL
+#define INIT_BSD_SIGNAL
+#endif  // SANITIZER_INTERCEPT_BSD_SIGNAL
+
+#if SANITIZER_INTERCEPT_SIGNAL_AND_SIGACTION
+INTERCEPTOR(void *, signal, int signum, void *handler) {
+  if (GetHandleSignalMode(signum) == kHandleSignalExclusive) return nullptr;
+  return REAL(signal)(signum, handler);
+}
+#define INIT_SIGNAL COMMON_INTERCEPT_FUNCTION(signal)
+
+INTERCEPTOR(int, sigaction, int signum, const struct sigaction *act,
+            struct sigaction *oldact) {
+  if (GetHandleSignalMode(signum) == kHandleSignalExclusive) return 0;
+  return REAL(sigaction)(signum, act, oldact);
+}
+#define INIT_SIGACTION COMMON_INTERCEPT_FUNCTION(sigaction)
+
+namespace __sanitizer {
+int real_sigaction(int signum, const void *act, void *oldact) {
+  return REAL(sigaction)(signum, (const struct sigaction *)act,
+                         (struct sigaction *)oldact);
+}
+}  // namespace __sanitizer
+#else  // SANITIZER_INTERCEPT_SIGNAL_AND_SIGACTION
+#define INIT_SIGNAL
+#define INIT_SIGACTION
+// We need to have defined REAL(sigaction) on other systems.
+DEFINE_REAL(int, sigaction, int signum, const struct sigaction *act,
+            struct sigaction *oldact)
+#endif  // SANITIZER_INTERCEPT_SIGNAL_AND_SIGACTION
+
+static void InitializeSignalInterceptors() {
+  static bool was_called_once;
+  CHECK(!was_called_once);
+  was_called_once = true;
+
+  INIT_BSD_SIGNAL;
+  INIT_SIGNAL;
+  INIT_SIGACTION;
+}