mirror of
https://github.com/google/sandboxed-api.git
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91 lines
2.9 KiB
C++
91 lines
2.9 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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// The sandbox2::StackTrace class provides static methods useful when analyzing
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// call-stack of the process. It uses libunwind-ptrace, so the process must be
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// in a stopped state to call those methods.
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#ifndef SANDBOXED_API_SANDBOX2_STACK_TRACE_H_
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#define SANDBOXED_API_SANDBOX2_STACK_TRACE_H_
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#include <cstddef>
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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 "absl/log/check.h"
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#include "absl/status/statusor.h"
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#include "sandboxed_api/sandbox2/comms.h"
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#include "sandboxed_api/sandbox2/executor.h"
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#include "sandboxed_api/sandbox2/namespace.h"
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#include "sandboxed_api/sandbox2/policy.h"
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#include "sandboxed_api/sandbox2/regs.h"
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#include "sandboxed_api/sandbox2/result.h"
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namespace sandbox2 {
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class Sandbox2;
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class StackTraceTestPeer;
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namespace internal {
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class SandboxPeer {
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public:
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static std::unique_ptr<SandboxPeer> Spawn(std::unique_ptr<Executor> executor,
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std::unique_ptr<Policy> policy) {
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CHECK_NE(spawn_fn_, nullptr);
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return spawn_fn_(std::move(executor), std::move(policy));
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}
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virtual ~SandboxPeer() = default;
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virtual Comms* comms() = 0;
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virtual void Kill() = 0;
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virtual Result AwaitResult() = 0;
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private:
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friend class ::sandbox2::Sandbox2;
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friend class ::sandbox2::StackTraceTestPeer;
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using SpawnFn = std::unique_ptr<SandboxPeer> (*)(std::unique_ptr<Executor>,
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std::unique_ptr<Policy>);
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static SpawnFn spawn_fn_;
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};
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} // namespace internal
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// Maximum depth of analyzed call stack.
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constexpr size_t kDefaultMaxFrames = 200;
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// Returns the stack-trace of the PID=pid, one line per frame.
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absl::StatusOr<std::vector<std::string>> GetStackTrace(
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const Regs* regs, const Namespace* ns, bool uses_custom_forkserver,
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int recursion_depth);
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// Returns a stack trace that collapses duplicate stack frames and annotates
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// them with a repetition count.
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// Example:
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// _start _start
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// main main
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// recursive_call recursive_call
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// recursive_call (previous frame repeated 2 times)
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// recursive_call tail_call
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// tail_call
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std::vector<std::string> CompactStackTrace(
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const std::vector<std::string>& stack_trace);
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} // namespace sandbox2
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#endif // SANDBOXED_API_SANDBOX2_STACK_TRACE_H_
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