Give plug-in processes an executable heap and disable PIE/ASLR for Native

chrome/app/chrome_main.cc

 // Copyright (c) 2011 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/app/chrome_main.h"
 
 #include "base/at_exit.h"
 #include "base/command_line.h"
 #include "base/debug/debugger.h"
 #include "base/i18n/icu_util.h"
@@ skipping 746 matching lines @@
   // The main app bundle should only be used for the browser process, so it
   // should never see a --type switch (switches::kProcessType).  Likewise,
   // the helper should always have a --type switch.
   //
   // This check is done this late so there is already a call to
   // base::mac::IsBackgroundOnlyProcess(), so there is no change in
   // startup/initialization order.
 
   // The helper's Info.plist marks it as a background only app.
   if (base::mac::IsBackgroundOnlyProcess()) {
-    CHECK(command_line.HasSwitch(switches::kProcessType))
+    CHECK(command_line.HasSwitch(switches::kProcessType) &&
+          !process_type.empty())
         << "Helper application requires --type.";
+
+    // In addition, some helper flavors only work with certain process types.
+    FilePath executable;
+    if (PathService::Get(base::FILE_EXE, &executable) &&
+        executable.value().size() >= 3) {
+      std::string last_three =
+          executable.value().substr(executable.value().size() - 3);
+
+      if (last_three == " EH") {
+        CHECK_EQ(switches::kPluginProcess, process_type)
+            << "Executable-heap process requires --type="
+            << switches::kPluginProcess << ", saw " << process_type;
+      } else if (last_three == " NP") {
+        CHECK_EQ(switches::kNaClLoaderProcess, process_type)
+            << "Non-PIE process requires --type="
+            << switches::kNaClLoaderProcess << ", saw " << process_type;
+      } else {
+        CHECK(process_type != switches::kPluginProcess &&
+              process_type != switches::kNaClLoaderProcess)
+            << "Non-executable-heap PIE process is intolerant of --type="
+            << switches::kPluginProcess << " and "
+            << switches::kNaClLoaderProcess << ", saw " << process_type;
+      }
+    }
   } else {
-    CHECK(!command_line.HasSwitch(switches::kProcessType))
-        << "Main application forbids --type, saw \"" << process_type << "\".";
+    CHECK(!command_line.HasSwitch(switches::kProcessType) &&
+          process_type.empty())
+        << "Main application forbids --type, saw " << process_type;
   }
 
   if (IsCrashReporterEnabled())
     InitCrashProcessInfo();
 #endif  // defined(OS_MACOSX)
 
   InitializeStatsTable(browser_pid, command_line);
 
   base::StatsScope<base::StatsCounterTimer>
       startup_timer(content::Counters::chrome_main());
@@ skipping 127 matching lines @@
 
   if (SubprocessNeedsResourceBundle(process_type))
     ResourceBundle::CleanupSharedInstance();
 
   logging::CleanupChromeLogging();
 
   chrome_main::LowLevelShutdown();
 
   return exit_code;
 }