Add sandbox support for associating peer processes

sandbox/src/handle_policy_test.cc

Index: sandbox/src/handle_policy_test.cc
===================================================================
--- sandbox/src/handle_policy_test.cc	(revision 132034)
+++ sandbox/src/handle_policy_test.cc	(working copy)
@@ -65,5 +65,27 @@
   EXPECT_EQ(SBOX_TEST_SUCCEEDED, runner.RunTest(cmd_line.c_str()));
 }
 
+// Tests that duplicating an object works only when the policy allows it.
+TEST(HandlePolicyTest, DuplicatePeerHandle) {
+  TestRunner target;
+  TestRunner runner;
+
+  // Kick off an asynchronous target process for testing.
+  target.SetAsynchronous(true);
+  target.SetUnsandboxed(true);
+  EXPECT_EQ(SBOX_TEST_SUCCEEDED, target.RunTest(L"Handle_WaitProcess 30000"));
+
+  // First test that we fail to open the event.
+  std::wstring cmd_line = base::StringPrintf(L"Handle_DuplicateEvent %d",
+                                             target.process_id());
+  EXPECT_EQ(SBOX_TEST_DENIED, runner.RunTest(cmd_line.c_str()));
+
+  // Now successfully open the event after adding a duplicate handle rule.
+  EXPECT_TRUE(runner.AddRule(TargetPolicy::SUBSYS_HANDLES,
+                             TargetPolicy::HANDLES_DUP_ANY,
+                             L"Event"));
+  EXPECT_EQ(SBOX_TEST_SUCCEEDED, runner.RunTest(cmd_line.c_str()));
+}
+
 }  // namespace sandbox