mirror of
https://github.com/google/sandboxed-api.git
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74 lines
2.5 KiB
C++
74 lines
2.5 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 <sys/prctl.h>
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#include <sys/socket.h>
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#include <unistd.h>
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#include <csignal>
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#include <cstdlib>
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#include "absl/base/attributes.h"
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#include "absl/strings/str_cat.h"
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#include "sandboxed_api/sandbox2/comms.h"
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#include "sandboxed_api/sandbox2/forkserver.h"
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#include "sandboxed_api/sandbox2/sanitizer.h"
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#include "sandboxed_api/util/raw_logging.h"
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#include "sandboxed_api/util/strerror.h"
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int main() {
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// Make sure the logs go stderr.
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google::LogToStderr();
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// Close all non-essential FDs to keep newly opened FD numbers consistent.
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absl::Status status = sandbox2::sanitizer::CloseAllFDsExcept(
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{0, 1, 2, sandbox2::Comms::kSandbox2ClientCommsFD});
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if (!status.ok()) {
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SAPI_RAW_LOG(WARNING, "Closing non-essential FDs failed");
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}
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// Make the process' name easily recognizable with ps/pstree.
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if (prctl(PR_SET_NAME, "S2-FORK-SERV", 0, 0, 0) != 0) {
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SAPI_RAW_PLOG(WARNING, "prctl(PR_SET_NAME, 'S2-FORK-SERV')");
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}
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// Don't react (with stack-tracing) to SIGTERM's sent from other processes
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// (e.g. from the borglet or SubProcess). This ForkServer should go down if
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// the parent goes down (or if the GlobalForkServerComms is closed), which is
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// assured by prctl(PR_SET_PDEATHSIG, SIGKILL) being called in the
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// ForkServer::Initialize(). We don't want to change behavior of non-global
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// ForkServers, hence it's called here and not in the
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// ForkServer::Initialize().
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struct sigaction sa;
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sa.sa_handler = SIG_IGN;
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sa.sa_flags = 0;
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sigemptyset(&sa.sa_mask);
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if (sigaction(SIGTERM, &sa, nullptr) == -1) {
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SAPI_RAW_PLOG(WARNING, "sigaction(SIGTERM, sa_handler=SIG_IGN)");
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}
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sandbox2::Comms comms(sandbox2::Comms::kSandbox2ClientCommsFD);
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sandbox2::ForkServer fork_server(&comms);
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while (true) {
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pid_t child_pid = fork_server.ServeRequest();
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if (!child_pid) {
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// FORKSERVER_FORK sent to the global forkserver. This case does not make
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// sense, we thus kill the process here.
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exit(0);
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}
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}
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}
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