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/*
* Copyright (c) 2020 Samsung Electronics Co., Ltd. All rights reserved.
*
* This file is licensed under the terms of MIT License or the Apache License
* Version 2.0 of your choice. See the LICENSE.MIT file for MIT license details.
* See the LICENSE file or the notice below for Apache License Version 2.0
* details.
*
* 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.
*/
/*
* @brief Definition of proper privilege dropping check utilities
*/
#pragma once
#include <utils.h>
#include <vector>
namespace SecurityManager {
namespace CheckProperDrop {
// SERVICE & CLIENT
// "pid" and "user" imply consistency among threads so are not checked,
// see man unshare(2): CLONE_NEW{IPC,USER} implies CLONE_THREAD
constexpr inline const char *NS_NAMES[] = {"mnt", "ipc", "net", "uts"};
constexpr inline auto N_FLAG_BITS = sizeof NS_NAMES / sizeof NS_NAMES[0];
static_assert(N_FLAG_BITS <= 7, "flags too large for int8_t");
// SERVICE ONLY
// Negative on unrecoverable error.
// Otherwise bit i set iff NS_NAMES[i] checked.
int8_t computeFlags();
// CLIENT ONLY
void checkThreads(const std::vector<int> &synced_tids);
} // namespace CheckProperDrop
} // namespace SecurityManager
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