1*ec63e07aSXin Li // Copyright 2019 Google LLC 2*ec63e07aSXin Li // 3*ec63e07aSXin Li // Licensed under the Apache License, Version 2.0 (the "License"); 4*ec63e07aSXin Li // you may not use this file except in compliance with the License. 5*ec63e07aSXin Li // You may obtain a copy of the License at 6*ec63e07aSXin Li // 7*ec63e07aSXin Li // https://www.apache.org/licenses/LICENSE-2.0 8*ec63e07aSXin Li // 9*ec63e07aSXin Li // Unless required by applicable law or agreed to in writing, software 10*ec63e07aSXin Li // distributed under the License is distributed on an "AS IS" BASIS, 11*ec63e07aSXin Li // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12*ec63e07aSXin Li // See the License for the specific language governing permissions and 13*ec63e07aSXin Li // limitations under the License. 14*ec63e07aSXin Li 15*ec63e07aSXin Li #ifndef SANDBOXED_API_SANDBOX2_UTIL_MINIELF_H_ 16*ec63e07aSXin Li #define SANDBOXED_API_SANDBOX2_UTIL_MINIELF_H_ 17*ec63e07aSXin Li 18*ec63e07aSXin Li #include <cstdint> 19*ec63e07aSXin Li #include <string> 20*ec63e07aSXin Li #include <vector> 21*ec63e07aSXin Li 22*ec63e07aSXin Li #include "absl/status/statusor.h" 23*ec63e07aSXin Li 24*ec63e07aSXin Li namespace sandbox2 { 25*ec63e07aSXin Li 26*ec63e07aSXin Li // Minimal implementation of an ELF file parser to read the program interpreter. 27*ec63e07aSXin Li class ElfFile { 28*ec63e07aSXin Li public: 29*ec63e07aSXin Li struct Symbol { 30*ec63e07aSXin Li uintptr_t address; 31*ec63e07aSXin Li std::string name; 32*ec63e07aSXin Li }; 33*ec63e07aSXin Li 34*ec63e07aSXin Li static constexpr uint32_t kGetInterpreter = 1 << 0; 35*ec63e07aSXin Li static constexpr uint32_t kLoadSymbols = 1 << 1; 36*ec63e07aSXin Li static constexpr uint32_t kLoadImportedLibraries = 1 << 2; 37*ec63e07aSXin Li static constexpr uint32_t kAll = 38*ec63e07aSXin Li kGetInterpreter | kLoadSymbols | kLoadImportedLibraries; 39*ec63e07aSXin Li 40*ec63e07aSXin Li static absl::StatusOr<ElfFile> ParseFromFile(const std::string& filename, 41*ec63e07aSXin Li uint32_t features); 42*ec63e07aSXin Li file_size()43*ec63e07aSXin Li int64_t file_size() const { return file_size_; } interpreter()44*ec63e07aSXin Li const std::string& interpreter() const { return interpreter_; } symbols()45*ec63e07aSXin Li const std::vector<Symbol>& symbols() const { return symbols_; } imported_libraries()46*ec63e07aSXin Li const std::vector<std::string>& imported_libraries() const { 47*ec63e07aSXin Li return imported_libraries_; 48*ec63e07aSXin Li } position_independent()49*ec63e07aSXin Li bool position_independent() const { return position_independent_; } 50*ec63e07aSXin Li 51*ec63e07aSXin Li private: 52*ec63e07aSXin Li friend class ElfParser; 53*ec63e07aSXin Li 54*ec63e07aSXin Li bool position_independent_; 55*ec63e07aSXin Li int64_t file_size_ = 0; 56*ec63e07aSXin Li std::string interpreter_; 57*ec63e07aSXin Li std::vector<Symbol> symbols_; 58*ec63e07aSXin Li std::vector<std::string> imported_libraries_; 59*ec63e07aSXin Li }; 60*ec63e07aSXin Li 61*ec63e07aSXin Li } // namespace sandbox2 62*ec63e07aSXin Li 63*ec63e07aSXin Li #endif // SANDBOXED_API_SANDBOX2_UTIL_MINIELF_H_ 64