sandboxed-api/sandboxed_api/sandbox2/util/minielf.h

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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.
#ifndef SANDBOXED_API_SANDBOX2_UTIL_MINIELF_H_
#define SANDBOXED_API_SANDBOX2_UTIL_MINIELF_H_
#include <cstdio>
#include <memory>
#include <string>
#include <vector>
#include "absl/status/statusor.h"
namespace sandbox2 {
// Minimal implementation of an ELF file parser to read the program interpreter.
// Only understands 64-bit ELFs.
class ElfFile {
public:
struct Symbol {
uint64_t address;
std::string name;
};
static absl::StatusOr<ElfFile> ParseFromFile(const std::string& filename,
uint32_t features);
int64_t file_size() const { return file_size_; }
const std::string& interpreter() const { return interpreter_; }
const std::vector<Symbol> symbols() const { return symbols_; }
const std::vector<std::string> imported_libraries() const {
return imported_libraries_;
}
bool position_independent() const { return position_independent_; }
static constexpr uint32_t kGetInterpreter = 1 << 0;
static constexpr uint32_t kLoadSymbols = 1 << 1;
static constexpr uint32_t kLoadImportedLibraries = 1 << 2;
static constexpr uint32_t kAll =
kGetInterpreter | kLoadSymbols | kLoadImportedLibraries;
private:
friend class ElfParser;
bool position_independent_;
int64_t file_size_ = 0;
std::string interpreter_;
std::vector<Symbol> symbols_;
std::vector<std::string> imported_libraries_;
};
} // namespace sandbox2
#endif // SANDBOXED_API_SANDBOX2_UTIL_MINIELF_H_