| Index: src/platform-linux.cc | 
| diff --git a/src/platform-linux.cc b/src/platform-linux.cc | 
| index 14297483c3ad401a48ae6d8417f70c8941f889b1..0da1c08fdd5cb0f63246e69e6b034acdb10348ea 100644 | 
| --- a/src/platform-linux.cc | 
| +++ b/src/platform-linux.cc | 
| @@ -666,6 +666,12 @@ bool VirtualMemory::Uncommit(void* address, size_t size) { | 
| } | 
|  | 
|  | 
| +bool VirtualMemory::Guard(void* address) { | 
| +  OS::Guard(address, OS::CommitPageSize()); | 
| +  return true; | 
| +} | 
| + | 
| + | 
| void* VirtualMemory::ReserveRegion(size_t size) { | 
| void* result = mmap(OS::GetRandomMmapAddr(), | 
| size, | 
|  |