SECCOMP-BPF: Added supported for inspection system call arguments from BPF filters.

sandbox/linux/tests/unit_tests.h

 // Copyright (c) 2012 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.
 
 #ifndef SANDBOX_LINUX_TESTS_UNIT_TESTS_H__
 #define SANDBOX_LINUX_TESTS_UNIT_TESTS_H__
 
 #include "base/basictypes.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace sandbox {
 
-// Define a new test case that runs inside of a death test. This is necessary,
-// as most of our tests by definition make global and irreversible changes to
-// the system (i.e. they install a sandbox). GTest provides death tests as a
-// tool to isolate global changes from the rest of the tests.
-#define SANDBOX_TEST(test_case_name, test_name)                               \
+// While it is perfectly OK for a complex test to provide its own DeathCheck
+// function. Most death tests have very simple requirements. These tests should
+// use one of the predefined DEATH_XXX macros as an argument to
+// SANDBOX_DEATH_TEST(). You can check for a (sub-)string in the output of the
+// test, for a particular exit code, or for a particular death signal.
+// NOTE: If you do decide to write your own DeathCheck, make sure to use
+//       gtests's ASSERT_XXX() macros instead of SANDBOX_ASSERT(). See
+//       unit_tests.cc for examples.
+#define DEATH_SUCCESS()     sandbox::UnitTests::DeathSuccess, NULL
+#define DEATH_MESSAGE(msg)  sandbox::UnitTests::DeathMessage,                 \
+                            static_cast<const void *>(                        \
+                                static_cast<const char *>(msg))
+#define DEATH_EXIT_CODE(rc) sandbox::UnitTests::DeathExitCode,                \
+                            reinterpret_cast<void *>(static_cast<intptr_t>(rc))
+#define DEATH_BY_SIGNAL(s)  sandbox::UnitTests::DeathExitCode,                \
+                            reinterpret_cast<void *>(static_cast<intptr_t>(s))
+
+// A SANDBOX_DEATH_TEST is just like a SANDBOX_TEST (see below), but it assumes
+// that the test actually dies. The death test only passes if the death occurs
+// in the expected fashion, as specified by "death" and "death_aux". These two
+// parameters are typically set to one of the DEATH_XXX() macros.
+#define SANDBOX_DEATH_TEST(test_case_name, test_name, death)                  \
   void TEST_##test_name(void *);                                              \
   TEST(test_case_name, test_name) {                                           \
-    sandbox::UnitTests::RunTestInProcess(TEST_##test_name, NULL);             \
+    sandbox::UnitTests::RunTestInProcess(TEST_##test_name, NULL, death);      \
   }                                                                           \
   void TEST_##test_name(void *)
 
+// Define a new test case that runs inside of a GTest death test. This is
+// necessary, as most of our tests by definition make global and irreversible
+// changes to the system (i.e. they install a sandbox). GTest provides death
+// tests as a tool to isolate global changes from the rest of the tests.
+#define SANDBOX_TEST(test_case_name, test_name)                               \
+  SANDBOX_DEATH_TEST(test_case_name, test_name, DEATH_SUCCESS())
+
 // Simple assertion macro that is compatible with running inside of a death
 // test. We unfortunately cannot use any of the GTest macros.
 #define SANDBOX_STR(x) #x
 #define SANDBOX_ASSERT(expr)                                                  \
   ((expr)                                                                     \
    ? static_cast<void>(0)                                                     \
    : sandbox::UnitTests::AssertionFailure(SANDBOX_STR(expr),                  \
                                           __FILE__, __LINE__))
 
 class UnitTests {
  public:
   typedef void (*Test)(void *);
+  typedef void (*DeathCheck)(int status, const std::string& msg,
+                             const void *aux);
 
   // Runs a test inside a short-lived process. Do not call this function
   // directly. It is automatically invoked by SANDBOX_TEST(). Most sandboxing
   // functions make global irreversible changes to the execution environment
   // and must therefore execute in their own isolated process.
-  static void RunTestInProcess(Test test, void *arg);
+  static void RunTestInProcess(Test test, void *arg, DeathCheck death,
+                               const void *death_aux);
 
   // Report a useful error message and terminate the current SANDBOX_TEST().
   // Calling this function from outside a SANDBOX_TEST() is unlikely to do
   // anything useful.
   static void AssertionFailure(const char *expr, const char *file, int line);
 
+  // Sometimes we determine at run-time that a test should be disabled.
+  // Call this method if we want to return from a test and completely
+  // ignore its results.
+  // You should not call this method, if the test already ran any test-relevant
+  // code. Most notably, you should not call it, you already wrote any messages
+  // to stderr.
+  static void IgnoreThisTest();
+
+  // A DeathCheck method that verifies that the test completed succcessfully.
+  // This is the default test mode for SANDBOX_TEST(). The "aux" parameter
+  // of this DeathCheck is unused (and thus unnamed)
+  static void DeathSuccess(int status, const std::string& msg, const void *);
+
+  // A DeathCheck method that verifies that the test completed with error
+  // code "1" and printed a message containing a particular substring. The
+  // "aux" pointer should point to a C-string containing the expected error
+  // message. This method is useful for checking assertion failures such as
+  // in SANDBOX_ASSERT() and/or SANDBOX_DIE().
+  static void DeathMessage(int status, const std::string& msg,
+                           const void *aux);
+
+  // A DeathCheck method that verifies that the test completed with a
+  // particular exit code. If the test output any messages to stderr, they are
+  // silently ignored. The expected exit code should be passed in by
+  // casting the its "int" value to a "void *", which is then used for "aux".
+  static void DeathExitCode(int status, const std::string& msg,
+                            const void *aux);
+
+  // A DeathCheck method that verifies that the test was terminated by a
+  // particular signal. If the test output any messages to stderr, they are
+  // silently ignore. The expected signal number should be passed in by
+  // casting the its "int" value to a "void *", which is then used for "aux".
+  static void DeathBySignal(int status, const std::string& msg,
+                            const void *aux);
+
  private:
   DISALLOW_IMPLICIT_CONSTRUCTORS(UnitTests);
 };
 
 }  // namespace
 
 #endif  // SANDBOX_LINUX_TESTS_UNIT_TESTS_H__