1 // Copyright (c) 2012 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.
5 #ifndef SANDBOX_LINUX_SECCOMP_BPF_BPF_TESTS_H__
6 #define SANDBOX_LINUX_SECCOMP_BPF_BPF_TESTS_H__
10 #include <sys/types.h>
12 #include "build/build_config.h"
13 #include "sandbox/linux/tests/unit_tests.h"
14 #include "sandbox/linux/seccomp-bpf/sandbox_bpf.h"
18 // A BPF_DEATH_TEST is just the same as a BPF_TEST, but it assumes that the
19 // test will fail with a particular known error condition. Use the DEATH_XXX()
20 // macros from unit_tests.h to specify the expected error condition.
21 // A BPF_DEATH_TEST is always disabled under ThreadSanitizer, see
23 #define BPF_DEATH_TEST(test_case_name, test_name, death, policy, aux...) \
24 void BPF_TEST_##test_name(sandbox::BpfTests<aux>::AuxType& BPF_AUX); \
25 TEST(test_case_name, DISABLE_ON_TSAN(test_name)) { \
26 sandbox::BpfTests<aux>::TestArgs arg(BPF_TEST_##test_name, policy); \
27 sandbox::BpfTests<aux>::RunTestInProcess( \
28 sandbox::BpfTests<aux>::TestWrapper, &arg, \
31 void BPF_TEST_##test_name(sandbox::BpfTests<aux>::AuxType& BPF_AUX)
33 // BPF_TEST() is a special version of SANDBOX_TEST(). It turns into a no-op,
34 // if the host does not have kernel support for running BPF filters.
35 // Also, it takes advantage of the Die class to avoid calling LOG(FATAL), from
36 // inside our tests, as we don't need or even want all the error handling that
37 // LOG(FATAL) would do.
38 // BPF_TEST() takes a C++ data type as an optional fourth parameter. If
39 // present, this sets up a variable that can be accessed as "BPF_AUX". This
40 // variable will be passed as an argument to the "policy" function. Policies
41 // would typically use it as an argument to Sandbox::Trap(), if they want to
42 // communicate data between the BPF_TEST() and a Trap() function.
43 #define BPF_TEST(test_case_name, test_name, policy, aux...) \
44 BPF_DEATH_TEST(test_case_name, test_name, DEATH_SUCCESS(), policy, aux)
47 // Assertions are handled exactly the same as with a normal SANDBOX_TEST()
48 #define BPF_ASSERT SANDBOX_ASSERT
51 // The "Aux" type is optional. We use an "empty" type by default, so that if
52 // the caller doesn't provide any type, all the BPF_AUX related data compiles
54 template<class Aux = int[0]>
55 class BpfTests : public UnitTests {
61 TestArgs(void (*t)(AuxType&), playground2::Sandbox::EvaluateSyscall p)
67 void (*test() const)(AuxType&) { return test_; }
68 playground2::Sandbox::EvaluateSyscall policy() const { return policy_; }
71 friend class BpfTests;
73 void (*test_)(AuxType&);
74 playground2::Sandbox::EvaluateSyscall policy_;
78 static void TestWrapper(void *void_arg) {
79 TestArgs *arg = reinterpret_cast<TestArgs *>(void_arg);
80 playground2::Die::EnableSimpleExit();
81 if (playground2::Sandbox::SupportsSeccompSandbox(-1) ==
82 playground2::Sandbox::STATUS_AVAILABLE) {
83 // Ensure the the sandbox is actually available at this time
85 BPF_ASSERT((proc_fd = open("/proc", O_RDONLY|O_DIRECTORY)) >= 0);
86 BPF_ASSERT(playground2::Sandbox::SupportsSeccompSandbox(proc_fd) ==
87 playground2::Sandbox::STATUS_AVAILABLE);
89 // Initialize and then start the sandbox with our custom policy
90 playground2::Sandbox sandbox;
91 sandbox.set_proc_fd(proc_fd);
92 sandbox.SetSandboxPolicy(arg->policy(), &arg->aux_);
93 sandbox.Sandbox::StartSandbox();
95 arg->test()(arg->aux_);
97 printf("This BPF test is not fully running in this configuration!\n");
98 // Android, ARM and Valgrind are the three only configurations where we
99 // accept not having kernel BPF support.
100 // TODO(jln): remote ARM from this list when possible (crbug.com/243478).
101 if (!IsAndroid() && !IsRunningOnValgrind() && !IsArchitectureArm()) {
102 const bool seccomp_bpf_is_supported = false;
103 BPF_ASSERT(seccomp_bpf_is_supported);
105 // Call the compiler and verify the policy. That's the least we can do,
106 // if we don't have kernel support.
107 playground2::Sandbox sandbox;
108 sandbox.SetSandboxPolicy(arg->policy(), &arg->aux_);
109 playground2::Sandbox::Program *program =
110 sandbox.AssembleFilter(true /* force_verification */);
112 sandbox::UnitTests::IgnoreThisTest();
117 DISALLOW_IMPLICIT_CONSTRUCTORS(BpfTests);
122 #endif // SANDBOX_LINUX_SECCOMP_BPF_BPF_TESTS_H__