linux: Crash browser on too-big messages to zygote.

content/browser/zygote_host/zygote_host_impl_linux.h

 // 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.
 
 #ifndef CONTENT_BROWSER_ZYGOTE_HOST_ZYGOTE_HOST_IMPL_LINUX_H_
 #define CONTENT_BROWSER_ZYGOTE_HOST_ZYGOTE_HOST_IMPL_LINUX_H_
 
 #include <string>
 #include <vector>
 
+#include "base/pickle.h"
 #include "base/process_util.h"
 #include "base/synchronization/lock.h"
 #include "content/public/browser/file_descriptor_info.h"
 #include "content/public/browser/zygote_host_linux.h"
 
 template<typename Type>
 struct DefaultSingletonTraits;
 
 class CONTENT_EXPORT ZygoteHostImpl : public content::ZygoteHost {
  public:
@@ skipping 19 matching lines @@
   // ZygoteHost implementation:
   virtual pid_t GetPid() const OVERRIDE;
   virtual pid_t GetSandboxHelperPid() const OVERRIDE;
   virtual int GetSandboxStatus() const OVERRIDE;
   virtual void AdjustRendererOOMScore(base::ProcessHandle process_handle,
                                       int score) OVERRIDE;
   virtual void AdjustLowMemoryMargin(int64 margin_mb) OVERRIDE;
 
  private:
   friend struct DefaultSingletonTraits<ZygoteHostImpl>;
+
   ZygoteHostImpl();
   virtual ~ZygoteHostImpl();
 
+  // Sends |data| to the zygote via |control_fd_|.  If |fds| is non-NULL, the
+  // included file descriptors will also be passed.  The caller is responsible
+  // for acquiring |control_lock_|.
+  bool SendMessage(const Pickle& data, const std::vector<int>* fds);
+
   ssize_t ReadReply(void* buf, size_t buflen);
 
   int control_fd_;  // the socket to the zygote
   // A lock protecting all communication with the zygote. This lock must be
   // acquired before sending a command and released after the result has been
   // received.
   base::Lock control_lock_;
   pid_t pid_;
   bool init_;
   bool using_suid_sandbox_;
   std::string sandbox_binary_;
   bool have_read_sandbox_status_word_;
   int sandbox_status_;
 };
 
 #endif  // CONTENT_BROWSER_ZYGOTE_HOST_ZYGOTE_HOST_IMPL_LINUX_H_