Enable check for DEP / NX page protection

src/trusted/service_runtime/sel_main.c

 /*
  * Copyright 2008 The Native Client Authors.  All rights reserved.
  * Use of this source code is governed by a BSD-style license that can
  * be found in the LICENSE file.
  */
 
 /*
  * NaCl Simple/secure ELF loader (NaCl SEL).
  */
 #include "native_client/src/include/portability.h"
@@ skipping 10 matching lines @@
 #include <malloc.h>
 #endif
 
 #include "native_client/src/shared/gio/gio.h"
 #include "native_client/src/shared/imc/nacl_imc_c.h"
 #include "native_client/src/shared/platform/nacl_log.h"
 #include "native_client/src/shared/platform/nacl_sync.h"
 #include "native_client/src/shared/platform/nacl_sync_checked.h"
 #include "native_client/src/shared/srpc/nacl_srpc.h"
 
+#include "native_client/src/trusted/platform_qualify/nacl_dep_qualify.h"
 #include "native_client/src/trusted/platform_qualify/nacl_os_qualify.h"
 
 #ifdef NACL_BREAKPAD
 #include "native_client/src/trusted/nacl_breakpad/nacl_breakpad.h"
 #endif
 #include "native_client/src/trusted/service_runtime/env_cleanser.h"
 #include "native_client/src/trusted/service_runtime/nacl_app.h"
 #include "native_client/src/trusted/service_runtime/nacl_all_modules.h"
 #include "native_client/src/trusted/service_runtime/nacl_config_dangerous.h"
 #include "native_client/src/trusted/service_runtime/nacl_debug.h"
@@ skipping 402 matching lines @@
    * Ensure this operating system platform is supported.
    */
   if (!skip_qualification && !NaClOsIsSupported()) {
     errcode = LOAD_UNSUPPORTED_OS_PLATFORM;
     nap->module_load_status = errcode;
     fprintf(stderr, "Error while loading \"%s\": %s\n",
             nacl_file,
             NaClErrorString(errcode));
   }
 
+  /*
+   * Ensure this platform has Data Execution Prevention enabled.
+   */
+  if (!skip_qualification && !NaClCheckDEP()) {
+    errcode = LOAD_DEP_UNSUPPORTED;
+    nap->module_load_status = errcode;
+    fprintf(stderr, "Error while loading \"%s\": %s\n",
+            nacl_file,
+            NaClErrorString(errcode));
+  }
+
   if (LOAD_OK == errcode) {
     errcode = NaClAppLoadFile((struct Gio *) &gf, nap, check_abi);
     if (LOAD_OK != errcode) {
       nap->module_load_status = errcode;
       fprintf(stderr, "Error while loading \"%s\": %s\n",
               nacl_file,
               NaClErrorString(errcode));
       fprintf(stderr,
               ("Using the wrong type of nexe (nacl-x86-32"
                " on an x86-64 or vice versa)\n"
@@ skipping 254 matching lines @@
     printf("Done.\n");
   }
   fflush(stdout);
 
   NaClAllModulesFini();
 
   WINDOWS_EXCEPTION_CATCH;
 
   _exit(ret_code);
 }