src/content/shell/android/linker_test_apk/src/org/chromium/chromium_linker_test_apk/LinkerTests.java

   1 // Copyright 2014 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 package org.chromium.chromium_linker_test_apk;
   6
   7 import android.util.Log;
   8
   9 import org.chromium.base.JNINamespace;
  10 import org.chromium.base.library_loader.Linker;
  11
  12 /**
  13  *  A class that is only used in linker test APK to perform runtime checks
  14  * in the current process.
  15  */
  16 @JNINamespace("content")
  17 public class LinkerTests implements Linker.TestRunner {
  18     private static final String TAG = "LinkerTests";
  19
  20     public LinkerTests() {}
  21
  22     @Override
  23     public boolean runChecks(int memoryDeviceConfig,
  24                              boolean isBrowserProcess) {
  25         boolean checkSharedRelro;
  26         if (isBrowserProcess) {
  27             switch (Linker.BROWSER_SHARED_RELRO_CONFIG) {
  28                 case Linker.BROWSER_SHARED_RELRO_CONFIG_NEVER:
  29                     checkSharedRelro = false;
  30                     break;
  31                 case Linker.BROWSER_SHARED_RELRO_CONFIG_LOW_RAM_ONLY:
  32                     // A shared RELRO should only be used on low-end devices.
  33                     checkSharedRelro =
  34                             (memoryDeviceConfig == Linker.MEMORY_DEVICE_CONFIG_LOW);
  35                     break;
  36                 case Linker.BROWSER_SHARED_RELRO_CONFIG_ALWAYS:
  37                     // Always check for a shared RELRO.
  38                     checkSharedRelro = true;
  39                     break;
  40                 default:
  41                     Log.e(TAG, "Invalid shared RELRO linker configuration: " +
  42                             Linker.BROWSER_SHARED_RELRO_CONFIG);
  43                     return false;
  44             }
  45         } else {
  46             // Service processes should always use a shared RELRO section.
  47             checkSharedRelro = true;
  48         }
  49
  50         if (checkSharedRelro)
  51             return nativeCheckForSharedRelros(isBrowserProcess);
  52         else
  53             return nativeCheckForNoSharedRelros(isBrowserProcess);
  54     }
  55
  56     // Check that there are shared RELRO sections in the current process,
  57     // and that they are properly mapped read-only. Returns true on success.
  58     private static native boolean nativeCheckForSharedRelros(boolean isBrowserProcess);
  59
  60     // Check that there are no shared RELRO sections in the current process,
  61     // return true on success.
  62     private static native boolean nativeCheckForNoSharedRelros(boolean isBrowserProcess);
  63
  64 }