IPC fuzzer child process component

chrome/browser/ipc_fuzzer_host.cc

+// Copyright 2013 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 "chrome/browser/ipc_fuzzer_host.h"
+
+#include "base/command_line.h"
+#include "base/files/file_path.h"
+#include "base/logging.h"
+#include "base/platform_file.h"
+#include "chrome/common/chrome_switches.h"
+#include "chrome/common/ipc_fuzzer_messages.h"
+#include "content/public/browser/render_process_host.h"
+#include "ipc/ipc_platform_file.h"
+
+namespace chrome {
+
+void SendTestcaseToIpcFuzzer(content::RenderProcessHost* host) {
+  const CommandLine& browser_command_line = *CommandLine::ForCurrentProcess();
+
+  if (!browser_command_line.HasSwitch(switches::kIpcFuzzerTestcase))
+    return;
+
+  base::FilePath testcase_path =
+      browser_command_line.GetSwitchValuePath(switches::kIpcFuzzerTestcase);
+
+  base::PlatformFileError error_code;
+  base::PlatformFile testcase_file;
+  testcase_file = base::CreatePlatformFile(
+      testcase_path,
+      base::PLATFORM_FILE_OPEN |
+      base::PLATFORM_FILE_READ,
+      NULL,
+      &error_code);
+
+  if (error_code != base::PLATFORM_FILE_OK) {
+    LOG(ERROR) << "Failed to open IPC fuzzer testcase: "
+               << testcase_path.value();
+    return;
+  }
+
+  IPC::PlatformFileForTransit file = IPC::GetFileHandleForProcess(
+    testcase_file,
+    host->GetHandle(),

[jochen (gone - plz use gerrit), 2013/07/16 09:07:58]

if I'm not mistaken, this won't work on Linux. You invoke this method when the
RPH is created. This is, however, before the process actually exists, and so
host->GetHandle() is not the actual handle which in turn is required on Windows
to create a FileForTransit

[aedla, 2013/07/16 20:42:47]

Did you mean this won't work on Windows. That could be true, I haven't tested it
on Windows. I won't fix it though, because most likely I'll rewrite the CL so
that the child process opens the testcase itself.

+    true);
+
+  host->Send(new IpcFuzzerMsg_RunTestcase(file));
+}
+
+}  // namespace chrome