Alter the design of the bootstrap sandbox to only take over the bootstrap port of children when nec…

sandbox/mac/launchd_interception_server.h

 // Copyright 2014 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.
 
 #ifndef SANDBOX_MAC_LAUNCHD_INTERCEPTION_SERVER_H_
 #define SANDBOX_MAC_LAUNCHD_INTERCEPTION_SERVER_H_
 
 #include <dispatch/dispatch.h>
 #include <mach/mach.h>
 
@@ skipping 10 matching lines @@
 // This class is used to run a Mach IPC message server. This server can
 // hold the receive right for a bootstrap_port of a process, and it filters
 // a subset of the launchd/bootstrap IPC call set for sandboxing. It permits
 // or rejects requests based on the per-process policy specified in the
 // BootstrapSandbox.
 class LaunchdInterceptionServer : public MessageDemuxer {
  public:
   explicit LaunchdInterceptionServer(const BootstrapSandbox* sandbox);
   virtual ~LaunchdInterceptionServer();
 
-  // Initializes the class and starts running the message server.
-  bool Initialize();
+  // Initializes the class and starts running the message server. If the
+  // |server_receive_right| is non-NULL, this class will take ownership of
+  // the receive right and intercept messages sent to that port.
+  bool Initialize(mach_port_t server_receive_right);
 
   // MessageDemuxer:
   virtual void DemuxMessage(mach_msg_header_t* request,
                             mach_msg_header_t* reply) OVERRIDE;
 
   mach_port_t server_port() const { return message_server_->server_port(); }
 
  private:
   // Given a look_up2 request message, this looks up the appropriate sandbox
   // policy for the service name then formulates and sends the reply message.
@@ skipping 24 matching lines @@
   base::mac::ScopedMachSendRight sandbox_send_port_;
 
   // The compatibility shim that handles differences in message header IDs and
   // request/reply structures between different OS X versions.
   const LaunchdCompatibilityShim compat_shim_;
 };
 
 }  // namespace sandbox
 
 #endif  // SANDBOX_MAC_LAUNCHD_INTERCEPTION_SERVER_H_