Add guard pages in front of platform allocations

src/platform-posix.cc

 // Copyright 2011 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 15 matching lines @@
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 // Platform specific code for POSIX goes here. This is not a platform on its
 // own but contains the parts which are the same across POSIX platforms Linux,
 // Mac OS, FreeBSD and OpenBSD.
 
 #include <unistd.h>
 #include <errno.h>
 #include <time.h>
 
+#include <sys/mman.h>
 #include <sys/socket.h>
 #include <sys/resource.h>
 #include <sys/time.h>
 #include <sys/types.h>
 #include <sys/stat.h>
 
 #include <arpa/inet.h>
 #include <netinet/in.h>
 #include <netdb.h>
 
+#undef MAP_TYPE
+
 #if defined(ANDROID)
 #define LOG_TAG "v8"
 #include <utils/Log.h>  // LOG_PRI_VA
 #endif
 
 #include "v8.h"
 
 #include "platform.h"
 
 namespace v8 {
 namespace internal {
 
 
 // Maximum size of the virtual memory.  0 means there is no artificial
 // limit.
 
 intptr_t OS::MaxVirtualMemory() {
   struct rlimit limit;
   int result = getrlimit(RLIMIT_DATA, &limit);
   if (result != 0) return 0;
   return limit.rlim_cur;
 }
 
 
+// Create guard pages.
+void OS::Guard(void* address, const size_t size) {
+  mprotect(address, size, PROT_NONE);
+}
+
+
 // ----------------------------------------------------------------------------
 // Math functions
 
 double modulo(double x, double y) {
   return fmod(x, y);
 }
 
 
 double OS::nan_value() {
   // NAN from math.h is defined in C99 and not in POSIX.
@@ skipping 360 matching lines @@
   return ntohl(value);
 }
 
 
 Socket* OS::CreateSocket() {
   return new POSIXSocket();
 }
 
 
 } }  // namespace v8::internal