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.
5 #include "sandbox/linux/seccomp-bpf/bpf_tests.h"
8 #include <sys/ptrace.h>
9 #include <sys/syscall.h>
10 #include <sys/types.h>
13 #include "base/logging.h"
14 #include "base/memory/scoped_ptr.h"
15 #include "build/build_config.h"
16 #include "sandbox/linux/bpf_dsl/bpf_dsl.h"
17 #include "sandbox/linux/bpf_dsl/policy.h"
18 #include "sandbox/linux/seccomp-bpf/sandbox_bpf.h"
19 #include "sandbox/linux/services/linux_syscalls.h"
20 #include "sandbox/linux/tests/unit_tests.h"
21 #include "testing/gtest/include/gtest/gtest.h"
23 using sandbox::bpf_dsl::Allow;
24 using sandbox::bpf_dsl::Error;
25 using sandbox::bpf_dsl::ResultExpr;
33 static const int kMagicValue = 42;
34 FourtyTwo() : value_(kMagicValue) {}
35 int value() { return value_; }
39 DISALLOW_COPY_AND_ASSIGN(FourtyTwo);
42 class EmptyClassTakingPolicy : public bpf_dsl::Policy {
44 explicit EmptyClassTakingPolicy(FourtyTwo* fourty_two) {
45 BPF_ASSERT(fourty_two);
46 BPF_ASSERT(FourtyTwo::kMagicValue == fourty_two->value());
48 virtual ~EmptyClassTakingPolicy() {}
50 virtual ResultExpr EvaluateSyscall(int sysno) const override {
51 DCHECK(SandboxBPF::IsValidSyscallNumber(sysno));
58 EmptyClassTakingPolicy,
59 FourtyTwo /* *BPF_AUX */) {
60 // BPF_AUX should point to an instance of FourtyTwo.
62 BPF_ASSERT(FourtyTwo::kMagicValue == BPF_AUX->value());
65 void DummyTestFunction(FourtyTwo *fourty_two) {
68 TEST(BPFTest, BPFTesterCompatibilityDelegateLeakTest) {
69 // Don't do anything, simply gives dynamic tools an opportunity to detect
72 BPFTesterCompatibilityDelegate<EmptyClassTakingPolicy, FourtyTwo>
73 simple_delegate(DummyTestFunction);
77 scoped_ptr<BPFTesterDelegate> simple_delegate(
78 new BPFTesterCompatibilityDelegate<EmptyClassTakingPolicy, FourtyTwo>(
83 class EnosysPtracePolicy : public bpf_dsl::Policy {
85 EnosysPtracePolicy() {
86 my_pid_ = syscall(__NR_getpid);
88 virtual ~EnosysPtracePolicy() {
89 // Policies should be able to bind with the process on which they are
90 // created. They should never be created in a parent process.
91 BPF_ASSERT_EQ(my_pid_, syscall(__NR_getpid));
94 virtual ResultExpr EvaluateSyscall(int system_call_number) const override {
95 CHECK(SandboxBPF::IsValidSyscallNumber(system_call_number));
96 if (system_call_number == __NR_ptrace) {
97 // The EvaluateSyscall function should run in the process that created
98 // the current object.
99 BPF_ASSERT_EQ(my_pid_, syscall(__NR_getpid));
100 return Error(ENOSYS);
108 DISALLOW_COPY_AND_ASSIGN(EnosysPtracePolicy);
111 class BasicBPFTesterDelegate : public BPFTesterDelegate {
113 BasicBPFTesterDelegate() {}
114 virtual ~BasicBPFTesterDelegate() {}
116 virtual scoped_ptr<bpf_dsl::Policy> GetSandboxBPFPolicy() override {
117 return scoped_ptr<bpf_dsl::Policy>(new EnosysPtracePolicy());
119 virtual void RunTestFunction() override {
121 int ret = ptrace(PTRACE_TRACEME, -1, NULL, NULL);
122 BPF_ASSERT(-1 == ret);
123 BPF_ASSERT(ENOSYS == errno);
127 DISALLOW_COPY_AND_ASSIGN(BasicBPFTesterDelegate);
130 // This is the most powerful and complex way to create a BPF test, but it
131 // requires a full class definition (BasicBPFTesterDelegate).
132 BPF_TEST_D(BPFTest, BPFTestWithDelegateClass, BasicBPFTesterDelegate);
134 // This is the simplest form of BPF tests.
135 BPF_TEST_C(BPFTest, BPFTestWithInlineTest, EnosysPtracePolicy) {
137 int ret = ptrace(PTRACE_TRACEME, -1, NULL, NULL);
138 BPF_ASSERT(-1 == ret);
139 BPF_ASSERT(ENOSYS == errno);
142 const char kHelloMessage[] = "Hello";
144 BPF_DEATH_TEST_C(BPFTest,
145 BPFDeathTestWithInlineTest,
146 DEATH_MESSAGE(kHelloMessage),
147 EnosysPtracePolicy) {
148 LOG(ERROR) << kHelloMessage;
154 } // namespace sandbox