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// 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_SECCOMP_BPF_BPF_TESTS_H__
#define SANDBOX_LINUX_SECCOMP_BPF_BPF_TESTS_H__
#include <fcntl.h>
#include <sys/stat.h>
#include <sys/types.h>
#include "build/build_config.h"
#include "sandbox/linux/tests/unit_tests.h"
#include "sandbox/linux/seccomp-bpf/sandbox_bpf.h"
namespace sandbox {
// A BPF_DEATH_TEST is just the same as a BPF_TEST, but it assumes that the
// test will fail with a particular known error condition. Use the DEATH_XXX()
// macros from unit_tests.h to specify the expected error condition.
// A BPF_DEATH_TEST is always disabled under ThreadSanitizer, see
// crbug.com/243968.
#define BPF_DEATH_TEST(test_case_name, test_name, death, policy, aux...) \
void BPF_TEST_##test_name(sandbox::BPFTests<aux>::AuxType& BPF_AUX); \
TEST(test_case_name, DISABLE_ON_TSAN(test_name)) { \
sandbox::BPFTests<aux>::TestArgs arg(BPF_TEST_##test_name, policy); \
sandbox::BPFTests<aux>::RunTestInProcess( \
sandbox::BPFTests<aux>::TestWrapper, &arg, death); \
} \
void BPF_TEST_##test_name(sandbox::BPFTests<aux>::AuxType& BPF_AUX)
// BPF_TEST() is a special version of SANDBOX_TEST(). It turns into a no-op,
// if the host does not have kernel support for running BPF filters.
// Also, it takes advantage of the Die class to avoid calling LOG(FATAL), from
// inside our tests, as we don't need or even want all the error handling that
// LOG(FATAL) would do.
// BPF_TEST() takes a C++ data type as an optional fourth parameter. If
// present, this sets up a variable that can be accessed as "BPF_AUX". This
// variable will be passed as an argument to the "policy" function. Policies
// would typically use it as an argument to SandboxBPF::Trap(), if they want to
// communicate data between the BPF_TEST() and a Trap() function.
#define BPF_TEST(test_case_name, test_name, policy, aux...) \
BPF_DEATH_TEST(test_case_name, test_name, DEATH_SUCCESS(), policy, aux)
// Assertions are handled exactly the same as with a normal SANDBOX_TEST()
#define BPF_ASSERT SANDBOX_ASSERT
// The "Aux" type is optional. We use an "empty" type by default, so that if
// the caller doesn't provide any type, all the BPF_AUX related data compiles
// to nothing.
template <class Aux = int[0]>
class BPFTests : public UnitTests {
public:
typedef Aux AuxType;
class TestArgs {
public:
TestArgs(void (*t)(AuxType&), sandbox::SandboxBPF::EvaluateSyscall p)
: test_(t), policy_(p), aux_() {}
void (*test() const)(AuxType&) { return test_; }
sandbox::SandboxBPF::EvaluateSyscall policy() const { return policy_; }
private:
friend class BPFTests;
void (*test_)(AuxType&);
sandbox::SandboxBPF::EvaluateSyscall policy_;
AuxType aux_;
};
static void TestWrapper(void* void_arg) {
TestArgs* arg = reinterpret_cast<TestArgs*>(void_arg);
sandbox::Die::EnableSimpleExit();
if (sandbox::SandboxBPF::SupportsSeccompSandbox(-1) ==
sandbox::SandboxBPF::STATUS_AVAILABLE) {
// Ensure the the sandbox is actually available at this time
int proc_fd;
BPF_ASSERT((proc_fd = open("/proc", O_RDONLY | O_DIRECTORY)) >= 0);
BPF_ASSERT(sandbox::SandboxBPF::SupportsSeccompSandbox(proc_fd) ==
sandbox::SandboxBPF::STATUS_AVAILABLE);
// Initialize and then start the sandbox with our custom policy
sandbox::SandboxBPF sandbox;
sandbox.set_proc_fd(proc_fd);
sandbox.SetSandboxPolicyDeprecated(arg->policy(), &arg->aux_);
sandbox.SandboxBPF::StartSandbox();
arg->test()(arg->aux_);
} else {
printf("This BPF test is not fully running in this configuration!\n");
// Android, ARM and Valgrind are the three only configurations where we
// accept not having kernel BPF support.
// TODO(jln): remote ARM from this list when possible (crbug.com/243478).
if (!IsAndroid() && !IsRunningOnValgrind() && !IsArchitectureArm()) {
const bool seccomp_bpf_is_supported = false;
BPF_ASSERT(seccomp_bpf_is_supported);
}
// Call the compiler and verify the policy. That's the least we can do,
// if we don't have kernel support.
sandbox::SandboxBPF sandbox;
sandbox.SetSandboxPolicyDeprecated(arg->policy(), &arg->aux_);
sandbox::SandboxBPF::Program* program =
sandbox.AssembleFilter(true /* force_verification */);
delete program;
sandbox::UnitTests::IgnoreThisTest();
}
}
private:
DISALLOW_IMPLICIT_CONSTRUCTORS(BPFTests);
};
} // namespace sandbox
#endif // SANDBOX_LINUX_SECCOMP_BPF_BPF_TESTS_H__
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