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96 lines
3.2 KiB
96 lines
3.2 KiB
4 months ago
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/*
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* Copyright (C) 2019 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 "view_compiler.h"
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#include <string>
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#include <fcntl.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <sys/wait.h>
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#include <unistd.h>
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#include "utils.h"
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#include "android-base/logging.h"
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#include "android-base/stringprintf.h"
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#include "android-base/unique_fd.h"
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namespace android {
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namespace installd {
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using base::unique_fd;
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bool view_compiler(const char* apk_path, const char* package_name, const char* out_dex_file,
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int uid) {
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CHECK(apk_path != nullptr);
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CHECK(package_name != nullptr);
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CHECK(out_dex_file != nullptr);
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// viewcompiler won't have permission to open anything, so we have to open the files first
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// and pass file descriptors.
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// Open input file
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unique_fd infd{open(apk_path, O_RDONLY)}; // NOLINT(android-cloexec-open)
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if (infd.get() < 0) {
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PLOG(ERROR) << "Could not open input file: " << apk_path;
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return false;
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}
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// Set up output file. viewcompiler can't open outputs by fd, but it can write to stdout, so
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// we close stdout and open it towards the right output.
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unique_fd outfd{open(out_dex_file, O_CREAT | O_TRUNC | O_WRONLY | O_CLOEXEC, 0644)};
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if (outfd.get() < 0) {
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PLOG(ERROR) << "Could not open output file: " << out_dex_file;
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return false;
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}
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if (fchmod(outfd, S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH) != 0) {
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PLOG(ERROR) << "Could not change output file permissions";
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return false;
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}
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if (dup2(outfd, STDOUT_FILENO) < 0) {
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PLOG(ERROR) << "Could not duplicate output file descriptor";
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return false;
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}
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// Prepare command line arguments for viewcompiler
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std::string args[] = {"/system/bin/viewcompiler",
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"--apk",
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"--infd",
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android::base::StringPrintf("%d", infd.get()),
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"--dex",
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"--package",
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package_name};
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char* const argv[] = {const_cast<char*>(args[0].c_str()), const_cast<char*>(args[1].c_str()),
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const_cast<char*>(args[2].c_str()), const_cast<char*>(args[3].c_str()),
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const_cast<char*>(args[4].c_str()), const_cast<char*>(args[5].c_str()),
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const_cast<char*>(args[6].c_str()), nullptr};
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pid_t pid = fork();
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if (pid == 0) {
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// Now that we've opened the files we need, drop privileges.
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drop_capabilities(uid);
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execv("/system/bin/viewcompiler", argv);
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_exit(1);
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}
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return wait_child(pid) == 0;
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}
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} // namespace installd
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} // namespace android
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