sandboxed-api/sandboxed_api/sandbox2/sandbox2.cc

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// Copyright 2019 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// Implementation file for the sandbox2::Sandbox class.
#include "sandboxed_api/sandbox2/sandbox2.h"
#include <csignal>
#include <memory>
#include <string>
#include "absl/memory/memory.h"
#include "absl/status/statusor.h"
#include "absl/time/time.h"
#include "sandboxed_api/sandbox2/monitor.h"
#include "sandboxed_api/sandbox2/result.h"
namespace sandbox2 {
Sandbox2::~Sandbox2() {
if (monitor_thread_ && monitor_thread_->joinable()) {
monitor_thread_->join();
}
}
absl::StatusOr<Result> Sandbox2::AwaitResultWithTimeout(
absl::Duration timeout) {
CHECK(monitor_ != nullptr) << "Sandbox was not launched yet";
CHECK(monitor_thread_ != nullptr) << "Sandbox was already waited on";
auto done =
monitor_->done_notification_.WaitForNotificationWithTimeout(timeout);
if (!done) {
return absl::DeadlineExceededError("Sandbox did not finish within timeout");
}
monitor_thread_->join();
CHECK(IsTerminated()) << "Monitor did not terminate";
// Reset the Monitor Thread object to its initial state, as to mark that this
// object cannot be used anymore to control behavior of the sandboxee (e.g.
// via signals).
monitor_thread_.reset(nullptr);
VLOG(1) << "Final execution status: " << monitor_->result_.ToString();
CHECK(monitor_->result_.final_status() != Result::UNSET);
return std::move(monitor_->result_);
}
Result Sandbox2::AwaitResult() {
return AwaitResultWithTimeout(absl::InfiniteDuration()).value();
}
bool Sandbox2::RunAsync() {
Launch();
// If the sandboxee setup failed we return 'false' here.
if (monitor_->IsDone() &&
monitor_->result_.final_status() == Result::SETUP_ERROR) {
return false;
}
return true;
}
void Sandbox2::NotifyMonitor() {
if (monitor_thread_ != nullptr) {
pthread_kill(monitor_thread_->native_handle(), SIGCHLD);
}
}
void Sandbox2::Kill() {
CHECK(monitor_ != nullptr) << "Sandbox was not launched yet";
monitor_->external_kill_request_flag_.clear(std::memory_order_relaxed);
NotifyMonitor();
}
void Sandbox2::DumpStackTrace() {
CHECK(monitor_ != nullptr) << "Sandbox was not launched yet";
monitor_->dump_stack_request_flag_.clear(std::memory_order_relaxed);
NotifyMonitor();
}
bool Sandbox2::IsTerminated() const {
CHECK(monitor_ != nullptr) << "Sandbox was not launched yet";
return monitor_->IsDone();
}
void Sandbox2::set_walltime_limit(absl::Duration limit) const {
if (limit == absl::ZeroDuration()) {
VLOG(1) << "Disarming walltime timer to ";
monitor_->deadline_millis_.store(0, std::memory_order_relaxed);
} else {
VLOG(1) << "Will set the walltime timer to " << limit;
absl::Time deadline = absl::Now() + limit;
monitor_->deadline_millis_.store(absl::ToUnixMillis(deadline),
std::memory_order_relaxed);
}
}
void Sandbox2::Launch() {
monitor_ =
absl::make_unique<Monitor>(executor_.get(), policy_.get(), notify_.get());
monitor_thread_ =
absl::make_unique<std::thread>(&Monitor::Run, monitor_.get());
// Wait for the Monitor to set-up the sandboxee correctly (or fail while
// doing that). From here on, it is safe to use the IPC object for
// non-sandbox-related data exchange.
monitor_->setup_notification_.WaitForNotification();
}
} // namespace sandbox2