Linux Sandbox: always discover Zygote PID properly

content/browser/zygote_host/zygote_host_impl_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 "content/browser/zygote_host/zygote_host_impl_linux.h"
 
 #include <string.h>
 #include <sys/socket.h>
 #include <sys/stat.h>
 #include <sys/types.h>
@@ skipping 164 matching lines @@
 
   options.fds_to_remap = &fds_to_map;
   base::Process process =
       using_namespace_sandbox
           ? sandbox::NamespaceSandbox::LaunchProcess(cmd_line, options)
           : base::LaunchProcess(cmd_line, options);
   CHECK(process.IsValid()) << "Failed to launch zygote process";
 
   dummy_fd.reset();
 
-  if (using_suid_sandbox) {
+  if (using_suid_sandbox || using_namespace_sandbox) {
     // The SUID sandbox will execute the zygote in a new PID namespace, and
     // the main zygote process will then fork from there.  Watch now our
     // elaborate dance to find and validate the zygote's PID.
 
     // First we receive a message from the zygote boot process.
     base::ProcessId boot_pid;
     CHECK(ReceiveFixedMessage(
         fds[0], kZygoteBootMessage, sizeof(kZygoteBootMessage), &boot_pid));
 
     // Within the PID namespace, the zygote boot process thinks it's PID 1,
@@ skipping 394 matching lines @@
   }
 
   if (!sandbox::Credentials::CanCreateProcessInNewUserNS()) {
     return false;
   }
 
   return true;
 }
 
 }  // namespace content