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126 lines
3.7 KiB
126 lines
3.7 KiB
/*
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* Copyright (C) 2020 The Android Open Source Project
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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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* http://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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*/
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#include <dirent.h>
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#include <sys/mount.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <sys/utsname.h>
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#include <sys/wait.h>
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#include <unistd.h>
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#include <cstdlib>
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#include <filesystem>
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#include <fstream>
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#include <iostream>
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#include <memory>
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#include <string>
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#include <vector>
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#include <modprobe/modprobe.h>
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#include "android-base/logging.h"
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#include "android-base/strings.h"
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using namespace android::base;
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static constexpr const char MODULE_BASE_DIR[] = "/lib/modules";
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bool LoadKernelModules() {
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struct utsname uts;
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if (uname(&uts)) {
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LOG(ERROR) << "Failed to get kernel version.";
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return false;
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}
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int major, minor;
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if (sscanf(uts.release, "%d.%d", &major, &minor) != 2) {
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LOG(ERROR) << "Failed to parse kernel version " << uts.release;
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return false;
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}
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std::unique_ptr<DIR, decltype(&closedir)> base_dir(opendir(MODULE_BASE_DIR), closedir);
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if (!base_dir) {
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LOG(ERROR) << "Unable to open /lib/modules, skipping module loading.";
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return false;
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}
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dirent* entry;
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std::vector<std::string> module_dirs;
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while ((entry = readdir(base_dir.get()))) {
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if (entry->d_type != DT_DIR) {
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continue;
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}
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int dir_major, dir_minor;
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if (sscanf(entry->d_name, "%d.%d", &dir_major, &dir_minor) != 2 || dir_major != major ||
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dir_minor != minor) {
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continue;
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}
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module_dirs.emplace_back(entry->d_name);
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}
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// Sort the directories so they are iterated over during module loading
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// in a consistent order. Alphabetical sorting is fine here because the
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// kernel version at the beginning of the directory name must match the
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// current kernel version, so the sort only applies to a label that
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// follows the kernel version, for example /lib/modules/5.4 vs.
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// /lib/modules/5.4-gki.
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std::sort(module_dirs.begin(), module_dirs.end());
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for (const auto& module_dir : module_dirs) {
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std::string dir_path(MODULE_BASE_DIR);
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dir_path.append("/");
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dir_path.append(module_dir);
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Modprobe m({dir_path});
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bool retval = m.LoadListedModules();
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int modules_loaded = m.GetModuleCount();
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if (modules_loaded > 0) {
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return retval;
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}
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}
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Modprobe m({MODULE_BASE_DIR});
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bool retval = m.LoadListedModules();
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int modules_loaded = m.GetModuleCount();
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if (modules_loaded > 0) {
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return retval;
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}
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return true;
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}
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int main(int argc, const char* argv[]) {
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SetLogger(StderrLogger);
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LOG(INFO) << "Guest VM init process";
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LOG(INFO) << "Command line: " << Join(std::vector(argv, argv + argc), " ");
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if (clearenv() != EXIT_SUCCESS) {
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PLOG(ERROR) << "clearenv";
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return EXIT_FAILURE;
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}
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LOG(INFO) << "Loading kernel modules...";
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if (!LoadKernelModules()) {
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LOG(ERROR) << "LoadKernelModules failed";
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return EXIT_FAILURE;
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}
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LOG(INFO) << "Executing test binary " << argv[1] << "...";
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execv(argv[1], (char**)(argv + 1));
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PLOG(ERROR) << "execv";
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return EXIT_FAILURE;
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}
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