sandboxed-api/sandboxed_api/sandbox2/stack-trace.h

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// Copyright 2019 Google LLC. All Rights Reserved.
//
// 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.
// The sandbox2::StackTrace class provides static methods useful when analyzing
// call-stack of the process. It uses libunwind-ptrace, so the process must be
// in a stopped state to call those methods.
#ifndef SANDBOXED_API_SANDBOX2_STACK_TRACE_H__
#define SANDBOXED_API_SANDBOX2_STACK_TRACE_H__
#include <sys/types.h>
#include <cstddef>
#include <memory>
#include <string>
#include "absl/flags/flag.h"
#include "sandboxed_api/sandbox2/mounts.h"
#include "sandboxed_api/sandbox2/policy.h"
#include "sandboxed_api/sandbox2/regs.h"
#include "sandboxed_api/sandbox2/unwind/unwind.pb.h"
// Exposed for testing only
ABSL_DECLARE_FLAG(bool, sandbox_libunwind_crash_handler);
namespace sandbox2 {
// Maximum depth of analyzed call stack.
constexpr size_t kDefaultMaxFrames = 200;
// Returns the stack-trace of the PID=pid, delimited by the delim argument.
std::string GetStackTrace(const Regs* regs, const Mounts& mounts,
const std::string& delim = " ");
// Similar to GetStackTrace() but without using the sandbox to isolate
// libunwind.
std::string UnsafeGetStackTrace(pid_t pid, const std::string& delim = " ");
} // namespace sandbox2
#endif // SANDBOXED_API_SANDBOX2_STACK_TRACE_H__