Lower RLIMIT_AS to 4GB after discussion with jschuh.

content/common/sandbox_linux.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include <fcntl.h>
 #include <sys/resource.h>
 #include <sys/stat.h>
 #include <sys/time.h>
 #include <sys/types.h>
 
@@ skipping 234 matching lines @@
   return seccomp_bpf_supported_;
 }
 
 bool LinuxSandbox::LimitAddressSpace(const std::string& process_type) {
   (void) process_type;
 #if defined(__x86_64__) && !defined(ADDRESS_SANITIZER)
   CommandLine* command_line = CommandLine::ForCurrentProcess();
   if (command_line->HasSwitch(switches::kNoSandbox)) {
     return false;
   }
-  // Limit the address space to 8GB.
-  const rlim_t kNewAddressSpaceMaxSize = 0x200000000L;
+  // Limit the address space to 4GB.
+  const rlim_t kNewAddressSpaceMaxSize = 0x100000000L;
   struct rlimit old_address_space_limit;
   if (getrlimit(RLIMIT_AS, &old_address_space_limit))
     return false;
   // Make sure we don't raise the existing limit.
   const struct rlimit new_address_space_limit = {
       std::min(old_address_space_limit.rlim_cur, kNewAddressSpaceMaxSize),
       std::min(old_address_space_limit.rlim_max, kNewAddressSpaceMaxSize)
       };
   int rc = setrlimit(RLIMIT_AS, &new_address_space_limit);
   return (rc == 0);
 #else
   return false;
 #endif  // __x86_64__ && !defined(ADDRESS_SANITIZER)
 }
 
 }  // namespace content