mirror of
https://github.com/google/sandboxed-api.git
synced 2024-03-22 13:11:30 +08:00
348 lines
12 KiB
C++
348 lines
12 KiB
C++
// Copyright 2019 Google LLC
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// https://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#include "sandboxed_api/sandbox2/stack_trace.h"
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#include <sys/types.h>
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#include <cstdio>
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#include <functional>
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#include <memory>
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#include <string>
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#include <utility>
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#include <vector>
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#include "gmock/gmock.h"
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#include "gtest/gtest.h"
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#include "absl/base/log_severity.h"
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#include "absl/flags/declare.h"
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#include "absl/flags/flag.h"
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#include "absl/flags/reflection.h"
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#include "absl/log/check.h"
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#include "absl/log/scoped_mock_log.h"
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#include "absl/strings/str_cat.h"
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#include "absl/time/time.h"
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#include "sandboxed_api/sandbox2/executor.h"
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#include "sandboxed_api/sandbox2/global_forkclient.h"
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#include "sandboxed_api/sandbox2/policy.h"
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#include "sandboxed_api/sandbox2/policybuilder.h"
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#include "sandboxed_api/sandbox2/result.h"
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#include "sandboxed_api/sandbox2/sandbox2.h"
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#include "sandboxed_api/testing.h"
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#include "sandboxed_api/util/fileops.h"
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#include "sandboxed_api/util/status_matchers.h"
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ABSL_DECLARE_FLAG(bool, sandbox_libunwind_crash_handler);
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namespace sandbox2 {
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class StackTraceTestPeer {
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public:
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static StackTraceTestPeer& GetInstance() {
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static auto* peer = new StackTraceTestPeer();
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return *peer;
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}
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std::unique_ptr<internal::SandboxPeer> SpawnFn(
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std::unique_ptr<Executor> executor, std::unique_ptr<Policy> policy) {
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if (crash_unwind_) {
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policy = PolicyBuilder().BuildOrDie();
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crash_unwind_ = false;
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}
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return old_spawn_fn_(std::move(executor), std::move(policy));
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}
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void ReplaceSpawnFn() {
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old_spawn_fn_ = internal::SandboxPeer::spawn_fn_;
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internal::SandboxPeer::spawn_fn_ = +[](std::unique_ptr<Executor> executor,
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std::unique_ptr<Policy> policy) {
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return GetInstance().SpawnFn(std::move(executor), std::move(policy));
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};
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}
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void RestoreSpawnFn() { internal::SandboxPeer::spawn_fn_ = old_spawn_fn_; }
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void CrashNextUnwind() { crash_unwind_ = true; }
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private:
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internal::SandboxPeer::SpawnFn old_spawn_fn_;
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bool crash_unwind_ = false;
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};
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struct ScopedSpawnOverride {
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ScopedSpawnOverride() { StackTraceTestPeer::GetInstance().ReplaceSpawnFn(); }
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~ScopedSpawnOverride() { StackTraceTestPeer::GetInstance().RestoreSpawnFn(); }
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ScopedSpawnOverride(ScopedSpawnOverride&&) = delete;
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ScopedSpawnOverride& operator=(ScopedSpawnOverride&&) = delete;
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ScopedSpawnOverride(const ScopedSpawnOverride&) = delete;
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ScopedSpawnOverride& operator=(const ScopedSpawnOverride&) = delete;
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void CrashNextUnwind() {
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StackTraceTestPeer::GetInstance().CrashNextUnwind();
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}
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};
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namespace {
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namespace file_util = ::sapi::file_util;
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using ::sapi::CreateDefaultPermissiveTestPolicy;
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using ::sapi::GetTestSourcePath;
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using ::testing::_;
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using ::testing::Contains;
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using ::testing::ContainsRegex;
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using ::testing::ElementsAre;
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using ::testing::Eq;
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using ::testing::IsEmpty;
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using ::testing::StartsWith;
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struct TestCase {
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std::string testname = "CrashMe";
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int testno = 1;
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int testmode = 1;
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int final_status = Result::SIGNALED;
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std::string function_name = testname;
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std::string full_function_description = "CrashMe(char)";
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std::function<void(PolicyBuilder*)> modify_policy;
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absl::Duration wall_time_limit = absl::ZeroDuration();
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};
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class StackTraceTest : public ::testing::TestWithParam<TestCase> {};
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// Test that symbolization of stack traces works.
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void SymbolizationWorksCommon(TestCase param) {
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const std::string path = GetTestSourcePath("sandbox2/testcases/symbolize");
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std::vector<std::string> args = {path, absl::StrCat(param.testno),
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absl::StrCat(param.testmode)};
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PolicyBuilder builder = CreateDefaultPermissiveTestPolicy(path);
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if (param.modify_policy) {
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param.modify_policy(&builder);
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}
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SAPI_ASSERT_OK_AND_ASSIGN(auto policy, builder.TryBuild());
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Sandbox2 s2(std::make_unique<Executor>(path, args), std::move(policy));
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ASSERT_TRUE(s2.RunAsync());
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s2.set_walltime_limit(param.wall_time_limit);
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auto result = s2.AwaitResult();
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EXPECT_THAT(result.final_status(), Eq(param.final_status));
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EXPECT_THAT(result.stack_trace(), Contains(StartsWith(param.function_name)));
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// Check that demangling works as well.
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EXPECT_THAT(result.stack_trace(),
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Contains(StartsWith(param.full_function_description)));
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EXPECT_THAT(result.stack_trace(), Contains(StartsWith("RunTest")));
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EXPECT_THAT(result.stack_trace(), Contains(StartsWith("main")));
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if (param.testmode == 2) {
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EXPECT_THAT(result.stack_trace(),
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Contains(StartsWith("RecurseA")).Times(5));
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EXPECT_THAT(result.stack_trace(),
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Contains(StartsWith("RecurseB")).Times(5));
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} else if (param.testmode == 3) {
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EXPECT_THAT(result.stack_trace(), Contains(StartsWith("LibCallCallback")));
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EXPECT_THAT(result.stack_trace(), Contains(StartsWith("LibRecurse")));
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EXPECT_THAT(result.stack_trace(),
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Contains(StartsWith("LibRecurseA")).Times(5));
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EXPECT_THAT(result.stack_trace(),
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Contains(StartsWith("LibRecurseB")).Times(5));
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}
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}
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void SymbolizationWorksWithModifiedPolicy(
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std::function<void(PolicyBuilder*)> modify_policy) {
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TestCase test_case;
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test_case.modify_policy = std::move(modify_policy);
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SymbolizationWorksCommon(test_case);
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}
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TEST_P(StackTraceTest, SymbolizationWorksNonSandboxedLibunwind) {
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absl::FlagSaver fs;
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absl::SetFlag(&FLAGS_sandbox_libunwind_crash_handler, false);
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SymbolizationWorksCommon(GetParam());
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}
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TEST_P(StackTraceTest, SymbolizationWorksSandboxedLibunwind) {
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absl::FlagSaver fs;
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absl::SetFlag(&FLAGS_sandbox_libunwind_crash_handler, true);
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SymbolizationWorksCommon(GetParam());
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}
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TEST(StackTraceTest, SymbolizationWorksSandboxedLibunwindProcDirMounted) {
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absl::FlagSaver fs;
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absl::SetFlag(&FLAGS_sandbox_libunwind_crash_handler, true);
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SymbolizationWorksWithModifiedPolicy(
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[](PolicyBuilder* builder) { builder->AddDirectory("/proc"); });
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}
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TEST(StackTraceTest, SymbolizationWorksSandboxedLibunwindProcFileMounted) {
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absl::FlagSaver fs;
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absl::SetFlag(&FLAGS_sandbox_libunwind_crash_handler, true);
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SymbolizationWorksWithModifiedPolicy([](PolicyBuilder* builder) {
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builder->AddFile("/proc/sys/vm/overcommit_memory");
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});
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}
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TEST(StackTraceTest, SymbolizationWorksSandboxedLibunwindSysDirMounted) {
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absl::FlagSaver fs;
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absl::SetFlag(&FLAGS_sandbox_libunwind_crash_handler, true);
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SymbolizationWorksWithModifiedPolicy(
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[](PolicyBuilder* builder) { builder->AddDirectory("/sys"); });
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}
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TEST(StackTraceTest, SymbolizationWorksSandboxedLibunwindSysFileMounted) {
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absl::FlagSaver fs;
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absl::SetFlag(&FLAGS_sandbox_libunwind_crash_handler, true);
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SymbolizationWorksWithModifiedPolicy([](PolicyBuilder* builder) {
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builder->AddFile("/sys/devices/system/cpu/online");
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});
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}
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size_t FileCountInDirectory(const std::string& path) {
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std::vector<std::string> fds;
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std::string error;
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CHECK(file_util::fileops::ListDirectoryEntries(path, &fds, &error));
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return fds.size();
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}
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TEST(StackTraceTest, ForkEnterNsLibunwindDoesNotLeakFDs) {
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absl::FlagSaver fs;
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absl::SetFlag(&FLAGS_sandbox_libunwind_crash_handler, true);
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// Very first sanitization might create some fds (e.g. for initial
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// namespaces).
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SymbolizationWorksCommon({});
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// Get list of open FDs in the global forkserver.
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pid_t forkserver_pid = GlobalForkClient::GetPid();
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std::string forkserver_fd_path =
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absl::StrCat("/proc/", forkserver_pid, "/fd");
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size_t filecount_before = FileCountInDirectory(forkserver_fd_path);
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SymbolizationWorksCommon({});
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EXPECT_THAT(filecount_before, Eq(FileCountInDirectory(forkserver_fd_path)));
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}
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TEST(StackTraceTest, CompactStackTrace) {
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EXPECT_THAT(CompactStackTrace({}), IsEmpty());
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EXPECT_THAT(CompactStackTrace({"_start"}), ElementsAre("_start"));
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EXPECT_THAT(CompactStackTrace({
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"_start",
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"main",
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"recursive_call",
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"recursive_call",
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"recursive_call",
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"tail_call",
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}),
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ElementsAre("_start", "main", "recursive_call",
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"(previous frame repeated 2 times)", "tail_call"));
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EXPECT_THAT(CompactStackTrace({
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"_start",
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"main",
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"recursive_call",
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"recursive_call",
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"recursive_call",
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"recursive_call",
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}),
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ElementsAre("_start", "main", "recursive_call",
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"(previous frame repeated 3 times)"));
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}
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TEST(StackTraceTest, RecursiveStackTrace) {
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// Very first sandbox run will initialize spawn_fn_
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SKIP_SANITIZERS;
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ScopedSpawnOverride spawn_override;
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SymbolizationWorksCommon({});
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absl::ScopedMockLog log;
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EXPECT_CALL(
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log,
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Log(absl::LogSeverity::kInfo, _,
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ContainsRegex(
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"Libunwind execution status: SYSCALL VIOLATION.*Stack: \\w+")));
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spawn_override.CrashNextUnwind();
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const std::string path = GetTestSourcePath("sandbox2/testcases/symbolize");
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std::vector<std::string> args = {path, absl::StrCat(1), absl::StrCat(1)};
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PolicyBuilder builder = CreateDefaultPermissiveTestPolicy(path);
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SAPI_ASSERT_OK_AND_ASSIGN(auto policy, builder.TryBuild());
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Sandbox2 s2(std::make_unique<Executor>(path, args), std::move(policy));
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log.StartCapturingLogs();
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ASSERT_TRUE(s2.RunAsync());
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auto result = s2.AwaitResult();
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EXPECT_THAT(result.final_status(), Eq(Result::SIGNALED));
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}
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INSTANTIATE_TEST_SUITE_P(
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Instantiation, StackTraceTest,
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::testing::Values(
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TestCase{
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.testname = "CrashMe",
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.testno = 1,
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.final_status = Result::SIGNALED,
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.full_function_description = "CrashMe(char)",
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},
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TestCase{
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.testname = "ViolatePolicy",
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.testno = 2,
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.final_status = Result::VIOLATION,
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.full_function_description = "ViolatePolicy(int)",
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},
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TestCase{
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.testname = "ExitNormally",
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.testno = 3,
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.final_status = Result::OK,
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.full_function_description = "ExitNormally(int)",
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.modify_policy =
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[](PolicyBuilder* builder) {
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builder->CollectStacktracesOnExit(true);
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},
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},
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TestCase{
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.testname = "SleepForXSeconds",
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.testno = 4,
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.final_status = Result::TIMEOUT,
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.full_function_description = "SleepForXSeconds(int)",
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.wall_time_limit = absl::Seconds(1),
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},
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TestCase{
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.testname = "ViolatePolicyRecursive",
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.testno = 2,
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.testmode = 2,
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.final_status = Result::VIOLATION,
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.function_name = "ViolatePolicy",
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.full_function_description = "ViolatePolicy(int)",
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},
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TestCase{
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.testname = "ViolatePolicyRecursiveLib",
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.testno = 2,
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.testmode = 3,
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.final_status = Result::VIOLATION,
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.function_name = "ViolatePolicy",
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.full_function_description = "ViolatePolicy(int)",
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},
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TestCase{
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.testname = "ViolatePolicyForked",
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.testno = 5,
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.final_status = Result::VIOLATION,
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.function_name = "ViolatePolicy",
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.full_function_description = "ViolatePolicy(int)",
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}),
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[](const ::testing::TestParamInfo<TestCase>& info) {
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return info.param.testname;
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});
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} // namespace
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} // namespace sandbox2
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