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https://github.com/google/sandboxed-api.git
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b258535161
This removes dependency on unwind from forkserver, which should reduce binary size for all the custom forkservers (also the SAPI generated ones). Unwind was only ever used by the global forkserver anyhow PiperOrigin-RevId: 557921074 Change-Id: Iea4904da0506fee5a00f970538f512cba7b02326
76 lines
2.7 KiB
C++
76 lines
2.7 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/log/globals.h"
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#include "sandboxed_api/sandbox2/client.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/sandbox2/unwind/unwind.h"
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#include "sandboxed_api/util/raw_logging.h"
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int main() {
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// Make sure the logs go stderr.
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absl::SetStderrThreshold(absl::LogSeverityAtLeast::kInfo);
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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::kDefaultConnection);
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sandbox2::ForkServer fork_server(&comms);
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sandbox2::sanitizer::WaitForSanitizer();
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while (!fork_server.IsTerminated()) {
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pid_t child_pid = fork_server.ServeRequest();
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if (child_pid == 0) {
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sandbox2::Client client(&comms);
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client.SandboxMeHere();
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exit(sandbox2::RunLibUnwindAndSymbolizer(&comms));
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}
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}
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SAPI_RAW_VLOG(1, "ForkServer Comms closed. Exiting");
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}
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