1252 lines
39 KiB
C++
1252 lines
39 KiB
C++
/*
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* Copyright (C) 2008 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 "util.h"
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#include <ctype.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <pwd.h>
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#include <signal.h>
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#include <stdarg.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/socket.h>
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#include <sys/un.h>
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#include <time.h>
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#include <unistd.h>
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#include <thread>
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#include <android-base/file.h>
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#include <android-base/logging.h>
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#include <android-base/properties.h>
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#include <android-base/scopeguard.h>
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#include <android-base/strings.h>
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#include <android-base/unique_fd.h>
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#include <cutils/sockets.h>
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#include <selinux/android.h>
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#ifdef INIT_FULL_SOURCES
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#include <android/api-level.h>
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#include <sys/system_properties.h>
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#include "reboot_utils.h"
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#include "selabel.h"
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#include "selinux.h"
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#else
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#include "host_init_stubs.h"
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#endif
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#ifdef MTK_LOG
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#if defined(__linux__)
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#include <sys/uio.h>
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#endif
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#include <mutex>
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#include <queue>
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#include <android-base/stringprintf.h>
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#include <android-base/chrono_utils.h>
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#include <android-base/parseint.h>
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using android::base::StringPrintf;
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#endif
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using android::base::boot_clock;
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using android::base::StartsWith;
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using namespace std::literals::string_literals;
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namespace android {
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namespace init {
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const std::string kDefaultAndroidDtDir("/proc/device-tree/firmware/android/");
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void (*trigger_shutdown)(const std::string& command) = nullptr;
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// DecodeUid() - decodes and returns the given string, which can be either the
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// numeric or name representation, into the integer uid or gid.
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Result<uid_t> DecodeUid(const std::string& name) {
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if (isalpha(name[0])) {
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passwd* pwd = getpwnam(name.c_str());
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if (!pwd) return ErrnoError() << "getpwnam failed";
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return pwd->pw_uid;
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}
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errno = 0;
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uid_t result = static_cast<uid_t>(strtoul(name.c_str(), 0, 0));
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if (errno) return ErrnoError() << "strtoul failed";
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return result;
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}
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/*
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* CreateSocket - creates a Unix domain socket in ANDROID_SOCKET_DIR
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* ("/dev/socket") as dictated in init.rc. This socket is inherited by the
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* daemon. We communicate the file descriptor's value via the environment
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* variable ANDROID_SOCKET_ENV_PREFIX<name> ("ANDROID_SOCKET_foo").
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*/
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Result<int> CreateSocket(const std::string& name, int type, bool passcred, mode_t perm, uid_t uid,
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gid_t gid, const std::string& socketcon) {
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if (!socketcon.empty()) {
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if (setsockcreatecon(socketcon.c_str()) == -1) {
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return ErrnoError() << "setsockcreatecon(\"" << socketcon << "\") failed";
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}
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}
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android::base::unique_fd fd(socket(PF_UNIX, type, 0));
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if (fd < 0) {
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return ErrnoError() << "Failed to open socket '" << name << "'";
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}
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if (!socketcon.empty()) setsockcreatecon(nullptr);
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struct sockaddr_un addr;
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memset(&addr, 0 , sizeof(addr));
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addr.sun_family = AF_UNIX;
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snprintf(addr.sun_path, sizeof(addr.sun_path), ANDROID_SOCKET_DIR "/%s", name.c_str());
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if ((unlink(addr.sun_path) != 0) && (errno != ENOENT)) {
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return ErrnoError() << "Failed to unlink old socket '" << name << "'";
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}
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std::string secontext;
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if (SelabelLookupFileContext(addr.sun_path, S_IFSOCK, &secontext) && !secontext.empty()) {
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setfscreatecon(secontext.c_str());
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}
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if (passcred) {
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int on = 1;
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if (setsockopt(fd, SOL_SOCKET, SO_PASSCRED, &on, sizeof(on))) {
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return ErrnoError() << "Failed to set SO_PASSCRED '" << name << "'";
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}
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}
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int ret = bind(fd, (struct sockaddr *) &addr, sizeof (addr));
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int savederrno = errno;
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if (!secontext.empty()) {
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setfscreatecon(nullptr);
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}
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auto guard = android::base::make_scope_guard([&addr] { unlink(addr.sun_path); });
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if (ret) {
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errno = savederrno;
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return ErrnoError() << "Failed to bind socket '" << name << "'";
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}
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if (lchown(addr.sun_path, uid, gid)) {
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return ErrnoError() << "Failed to lchown socket '" << addr.sun_path << "'";
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}
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if (fchmodat(AT_FDCWD, addr.sun_path, perm, AT_SYMLINK_NOFOLLOW)) {
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return ErrnoError() << "Failed to fchmodat socket '" << addr.sun_path << "'";
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}
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LOG(INFO) << "Created socket '" << addr.sun_path << "'"
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<< ", mode " << std::oct << perm << std::dec
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<< ", user " << uid
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<< ", group " << gid;
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guard.Disable();
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return fd.release();
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}
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Result<std::string> ReadFile(const std::string& path) {
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android::base::unique_fd fd(
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TEMP_FAILURE_RETRY(open(path.c_str(), O_RDONLY | O_NOFOLLOW | O_CLOEXEC)));
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if (fd == -1) {
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return ErrnoError() << "open() failed";
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}
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// For security reasons, disallow world-writable
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// or group-writable files.
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struct stat sb;
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if (fstat(fd, &sb) == -1) {
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return ErrnoError() << "fstat failed()";
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}
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if ((sb.st_mode & (S_IWGRP | S_IWOTH)) != 0) {
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return Error() << "Skipping insecure file";
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}
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std::string content;
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if (!android::base::ReadFdToString(fd, &content)) {
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return ErrnoError() << "Unable to read file contents";
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}
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return content;
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}
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static int OpenFile(const std::string& path, int flags, mode_t mode) {
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std::string secontext;
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if (SelabelLookupFileContext(path, mode, &secontext) && !secontext.empty()) {
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setfscreatecon(secontext.c_str());
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}
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int rc = open(path.c_str(), flags, mode);
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if (!secontext.empty()) {
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int save_errno = errno;
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setfscreatecon(nullptr);
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errno = save_errno;
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}
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return rc;
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}
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Result<void> WriteFile(const std::string& path, const std::string& content) {
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android::base::unique_fd fd(TEMP_FAILURE_RETRY(
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OpenFile(path, O_WRONLY | O_CREAT | O_NOFOLLOW | O_TRUNC | O_CLOEXEC, 0600)));
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if (fd == -1) {
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return ErrnoError() << "open() failed";
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}
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if (!android::base::WriteStringToFd(content, fd)) {
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return ErrnoError() << "Unable to write file contents";
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}
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return {};
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}
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bool mkdir_recursive(const std::string& path, mode_t mode) {
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std::string::size_type slash = 0;
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while ((slash = path.find('/', slash + 1)) != std::string::npos) {
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auto directory = path.substr(0, slash);
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struct stat info;
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if (stat(directory.c_str(), &info) != 0) {
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auto ret = make_dir(directory, mode);
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if (!ret && errno != EEXIST) return false;
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}
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}
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auto ret = make_dir(path, mode);
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if (!ret && errno != EEXIST) return false;
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return true;
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}
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int wait_for_file(const char* filename, std::chrono::nanoseconds timeout) {
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android::base::Timer t;
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while (t.duration() < timeout) {
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struct stat sb;
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if (stat(filename, &sb) != -1) {
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LOG(INFO) << "wait for '" << filename << "' took " << t;
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return 0;
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}
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std::this_thread::sleep_for(10ms);
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}
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LOG(WARNING) << "wait for '" << filename << "' timed out and took " << t;
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return -1;
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}
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void ImportKernelCmdline(const std::function<void(const std::string&, const std::string&)>& fn) {
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std::string cmdline;
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android::base::ReadFileToString("/proc/cmdline", &cmdline);
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for (const auto& entry : android::base::Split(android::base::Trim(cmdline), " ")) {
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std::vector<std::string> pieces = android::base::Split(entry, "=");
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if (pieces.size() == 2) {
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fn(pieces[0], pieces[1]);
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}
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}
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}
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void ImportBootconfig(const std::function<void(const std::string&, const std::string&)>& fn) {
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std::string bootconfig;
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android::base::ReadFileToString("/proc/bootconfig", &bootconfig);
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for (const auto& entry : android::base::Split(bootconfig, "\n")) {
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std::vector<std::string> pieces = android::base::Split(entry, "=");
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if (pieces.size() == 2) {
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// get rid of the extra space between a list of values and remove the quotes.
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std::string value = android::base::StringReplace(pieces[1], "\", \"", ",", true);
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value.erase(std::remove(value.begin(), value.end(), '"'), value.end());
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fn(android::base::Trim(pieces[0]), android::base::Trim(value));
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}
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}
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}
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bool make_dir(const std::string& path, mode_t mode) {
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std::string secontext;
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if (SelabelLookupFileContext(path, mode, &secontext) && !secontext.empty()) {
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setfscreatecon(secontext.c_str());
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}
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int rc = mkdir(path.c_str(), mode);
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if (!secontext.empty()) {
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int save_errno = errno;
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setfscreatecon(nullptr);
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errno = save_errno;
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}
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return rc == 0;
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}
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/*
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* Returns true is pathname is a directory
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*/
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bool is_dir(const char* pathname) {
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struct stat info;
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if (stat(pathname, &info) == -1) {
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return false;
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}
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return S_ISDIR(info.st_mode);
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}
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Result<std::string> ExpandProps(const std::string& src) {
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const char* src_ptr = src.c_str();
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std::string dst;
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/* - variables can either be $x.y or ${x.y}, in case they are only part
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* of the string.
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* - will accept $$ as a literal $.
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* - no nested property expansion, i.e. ${foo.${bar}} is not supported,
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* bad things will happen
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* - ${x.y:-default} will return default value if property empty.
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*/
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while (*src_ptr) {
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const char* c;
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c = strchr(src_ptr, '$');
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if (!c) {
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dst.append(src_ptr);
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return dst;
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}
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dst.append(src_ptr, c);
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c++;
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if (*c == '$') {
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dst.push_back(*(c++));
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src_ptr = c;
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continue;
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} else if (*c == '\0') {
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return dst;
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}
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std::string prop_name;
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std::string def_val;
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if (*c == '{') {
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c++;
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const char* end = strchr(c, '}');
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if (!end) {
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// failed to find closing brace, abort.
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return Error() << "unexpected end of string in '" << src << "', looking for }";
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}
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prop_name = std::string(c, end);
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c = end + 1;
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size_t def = prop_name.find(":-");
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if (def < prop_name.size()) {
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def_val = prop_name.substr(def + 2);
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prop_name = prop_name.substr(0, def);
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}
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} else {
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prop_name = c;
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if (SelinuxGetVendorAndroidVersion() >= __ANDROID_API_R__) {
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return Error() << "using deprecated syntax for specifying property '" << c
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<< "', use ${name} instead";
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} else {
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LOG(ERROR) << "using deprecated syntax for specifying property '" << c
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<< "', use ${name} instead";
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}
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c += prop_name.size();
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}
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if (prop_name.empty()) {
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return Error() << "invalid zero-length property name in '" << src << "'";
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}
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std::string prop_val = android::base::GetProperty(prop_name, "");
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if (prop_val.empty()) {
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if (def_val.empty()) {
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return Error() << "property '" << prop_name << "' doesn't exist while expanding '"
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<< src << "'";
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}
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prop_val = def_val;
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}
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dst.append(prop_val);
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src_ptr = c;
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}
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return dst;
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}
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static std::string init_android_dt_dir() {
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// Use the standard procfs-based path by default
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std::string android_dt_dir = kDefaultAndroidDtDir;
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// The platform may specify a custom Android DT path in kernel cmdline
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ImportKernelCmdline([&](const std::string& key, const std::string& value) {
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if (key == "androidboot.android_dt_dir") {
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android_dt_dir = value;
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}
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});
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// ..Or bootconfig
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if (android_dt_dir == kDefaultAndroidDtDir) {
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ImportBootconfig([&](const std::string& key, const std::string& value) {
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if (key == "androidboot.android_dt_dir") {
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android_dt_dir = value;
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}
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});
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}
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LOG(INFO) << "Using Android DT directory " << android_dt_dir;
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return android_dt_dir;
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}
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// FIXME: The same logic is duplicated in system/core/fs_mgr/
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const std::string& get_android_dt_dir() {
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// Set once and saves time for subsequent calls to this function
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static const std::string kAndroidDtDir = init_android_dt_dir();
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return kAndroidDtDir;
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}
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// Reads the content of device tree file under the platform's Android DT directory.
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// Returns true if the read is success, false otherwise.
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bool read_android_dt_file(const std::string& sub_path, std::string* dt_content) {
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const std::string file_name = get_android_dt_dir() + sub_path;
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if (android::base::ReadFileToString(file_name, dt_content)) {
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if (!dt_content->empty()) {
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dt_content->pop_back(); // Trims the trailing '\0' out.
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return true;
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}
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}
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return false;
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}
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bool is_android_dt_value_expected(const std::string& sub_path, const std::string& expected_content) {
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std::string dt_content;
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if (read_android_dt_file(sub_path, &dt_content)) {
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if (dt_content == expected_content) {
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return true;
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}
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}
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return false;
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}
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bool IsLegalPropertyName(const std::string& name) {
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size_t namelen = name.size();
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if (namelen < 1) return false;
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if (name[0] == '.') return false;
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if (name[namelen - 1] == '.') return false;
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/* Only allow alphanumeric, plus '.', '-', '@', ':', or '_' */
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/* Don't allow ".." to appear in a property name */
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for (size_t i = 0; i < namelen; i++) {
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if (name[i] == '.') {
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// i=0 is guaranteed to never have a dot. See above.
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if (name[i - 1] == '.') return false;
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continue;
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}
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if (name[i] == '_' || name[i] == '-' || name[i] == '@' || name[i] == ':') continue;
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if (name[i] >= 'a' && name[i] <= 'z') continue;
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if (name[i] >= 'A' && name[i] <= 'Z') continue;
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if (name[i] >= '0' && name[i] <= '9') continue;
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return false;
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}
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return true;
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}
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Result<void> IsLegalPropertyValue(const std::string& name, const std::string& value) {
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if (value.size() >= PROP_VALUE_MAX && !StartsWith(name, "ro.")) {
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return Error() << "Property value too long";
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}
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if (mbstowcs(nullptr, value.data(), 0) == static_cast<std::size_t>(-1)) {
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return Error() << "Value is not a UTF8 encoded string";
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}
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return {};
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}
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static FscryptAction FscryptInferAction(const std::string& dir) {
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const std::string prefix = "/data/";
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if (!android::base::StartsWith(dir, prefix)) {
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return FscryptAction::kNone;
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}
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// Special-case /data/media/obb per b/64566063
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if (dir == "/data/media/obb") {
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// Try to set policy on this directory, but if it is non-empty this may fail.
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return FscryptAction::kAttempt;
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}
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// Only set policy on first level /data directories
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// To make this less restrictive, consider using a policy file.
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// However this is overkill for as long as the policy is simply
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// to apply a global policy to all /data folders created via makedir
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if (dir.find_first_of('/', prefix.size()) != std::string::npos) {
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return FscryptAction::kNone;
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}
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// Special case various directories that must not be encrypted,
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// often because their subdirectories must be encrypted.
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// This isn't a nice way to do this, see b/26641735
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std::vector<std::string> directories_to_exclude = {
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"lost+found", "system_ce", "system_de", "misc_ce", "misc_de",
|
|
"vendor_ce", "vendor_de", "media", "data", "user",
|
|
"user_de", "apex", "preloads", "app-staging", "gsi",
|
|
};
|
|
for (const auto& d : directories_to_exclude) {
|
|
if ((prefix + d) == dir) {
|
|
return FscryptAction::kNone;
|
|
}
|
|
}
|
|
// Empty these directories if policy setting fails.
|
|
std::vector<std::string> wipe_on_failure = {
|
|
"rollback", "rollback-observer", // b/139193659
|
|
"connsyslog", "debuglogger", "ramdump",
|
|
"mdlog", "log_temp", "aee_exp", "mdl",
|
|
};
|
|
for (const auto& d : wipe_on_failure) {
|
|
if ((prefix + d) == dir) {
|
|
return FscryptAction::kDeleteIfNecessary;
|
|
}
|
|
}
|
|
return FscryptAction::kRequire;
|
|
}
|
|
|
|
Result<MkdirOptions> ParseMkdir(const std::vector<std::string>& args) {
|
|
mode_t mode = 0755;
|
|
Result<uid_t> uid = -1;
|
|
Result<gid_t> gid = -1;
|
|
FscryptAction fscrypt_inferred_action = FscryptInferAction(args[1]);
|
|
FscryptAction fscrypt_action = fscrypt_inferred_action;
|
|
std::string ref_option = "ref";
|
|
bool set_option_encryption = false;
|
|
bool set_option_key = false;
|
|
|
|
for (size_t i = 2; i < args.size(); i++) {
|
|
switch (i) {
|
|
case 2:
|
|
mode = std::strtoul(args[2].c_str(), 0, 8);
|
|
break;
|
|
case 3:
|
|
uid = DecodeUid(args[3]);
|
|
if (!uid.ok()) {
|
|
return Error()
|
|
<< "Unable to decode UID for '" << args[3] << "': " << uid.error();
|
|
}
|
|
break;
|
|
case 4:
|
|
gid = DecodeUid(args[4]);
|
|
if (!gid.ok()) {
|
|
return Error()
|
|
<< "Unable to decode GID for '" << args[4] << "': " << gid.error();
|
|
}
|
|
break;
|
|
default:
|
|
auto parts = android::base::Split(args[i], "=");
|
|
if (parts.size() != 2) {
|
|
return Error() << "Can't parse option: '" << args[i] << "'";
|
|
}
|
|
auto optname = parts[0];
|
|
auto optval = parts[1];
|
|
if (optname == "encryption") {
|
|
if (set_option_encryption) {
|
|
return Error() << "Duplicated option: '" << optname << "'";
|
|
}
|
|
if (optval == "Require") {
|
|
fscrypt_action = FscryptAction::kRequire;
|
|
} else if (optval == "None") {
|
|
fscrypt_action = FscryptAction::kNone;
|
|
} else if (optval == "Attempt") {
|
|
fscrypt_action = FscryptAction::kAttempt;
|
|
} else if (optval == "DeleteIfNecessary") {
|
|
fscrypt_action = FscryptAction::kDeleteIfNecessary;
|
|
} else {
|
|
return Error() << "Unknown encryption option: '" << optval << "'";
|
|
}
|
|
set_option_encryption = true;
|
|
} else if (optname == "key") {
|
|
if (set_option_key) {
|
|
return Error() << "Duplicated option: '" << optname << "'";
|
|
}
|
|
if (optval == "ref" || optval == "per_boot_ref") {
|
|
ref_option = optval;
|
|
} else {
|
|
return Error() << "Unknown key option: '" << optval << "'";
|
|
}
|
|
set_option_key = true;
|
|
} else {
|
|
return Error() << "Unknown option: '" << args[i] << "'";
|
|
}
|
|
}
|
|
}
|
|
if (set_option_key && fscrypt_action == FscryptAction::kNone) {
|
|
return Error() << "Key option set but encryption action is none";
|
|
}
|
|
const std::string prefix = "/data/";
|
|
if (StartsWith(args[1], prefix) &&
|
|
args[1].find_first_of('/', prefix.size()) == std::string::npos) {
|
|
if (!set_option_encryption) {
|
|
LOG(WARNING) << "Top-level directory needs encryption action, eg mkdir " << args[1]
|
|
<< " <mode> <uid> <gid> encryption=Require";
|
|
}
|
|
if (fscrypt_action == FscryptAction::kNone) {
|
|
LOG(INFO) << "Not setting encryption policy on: " << args[1];
|
|
}
|
|
}
|
|
if (fscrypt_action != fscrypt_inferred_action) {
|
|
LOG(WARNING) << "Inferred action different from explicit one, expected "
|
|
<< static_cast<int>(fscrypt_inferred_action) << " but got "
|
|
<< static_cast<int>(fscrypt_action);
|
|
}
|
|
|
|
return MkdirOptions{args[1], mode, *uid, *gid, fscrypt_action, ref_option};
|
|
}
|
|
|
|
Result<MountAllOptions> ParseMountAll(const std::vector<std::string>& args) {
|
|
bool compat_mode = false;
|
|
bool import_rc = false;
|
|
if (SelinuxGetVendorAndroidVersion() <= __ANDROID_API_Q__) {
|
|
if (args.size() <= 1) {
|
|
return Error() << "mount_all requires at least 1 argument";
|
|
}
|
|
compat_mode = true;
|
|
import_rc = true;
|
|
}
|
|
|
|
std::size_t first_option_arg = args.size();
|
|
enum mount_mode mode = MOUNT_MODE_DEFAULT;
|
|
|
|
// If we are <= Q, then stop looking for non-fstab arguments at slot 2.
|
|
// Otherwise, stop looking at slot 1 (as the fstab path argument is optional >= R).
|
|
for (std::size_t na = args.size() - 1; na > (compat_mode ? 1 : 0); --na) {
|
|
if (args[na] == "--early") {
|
|
first_option_arg = na;
|
|
mode = MOUNT_MODE_EARLY;
|
|
} else if (args[na] == "--late") {
|
|
first_option_arg = na;
|
|
mode = MOUNT_MODE_LATE;
|
|
import_rc = false;
|
|
}
|
|
}
|
|
|
|
std::string fstab_path;
|
|
if (first_option_arg > 1) {
|
|
fstab_path = args[1];
|
|
} else if (compat_mode) {
|
|
return Error() << "mount_all argument 1 must be the fstab path";
|
|
}
|
|
|
|
std::vector<std::string> rc_paths;
|
|
for (std::size_t na = 2; na < first_option_arg; ++na) {
|
|
rc_paths.push_back(args[na]);
|
|
}
|
|
|
|
return MountAllOptions{rc_paths, fstab_path, mode, import_rc};
|
|
}
|
|
|
|
Result<std::pair<int, std::vector<std::string>>> ParseRestorecon(
|
|
const std::vector<std::string>& args) {
|
|
struct flag_type {
|
|
const char* name;
|
|
int value;
|
|
};
|
|
static const flag_type flags[] = {
|
|
{"--recursive", SELINUX_ANDROID_RESTORECON_RECURSE},
|
|
{"--skip-ce", SELINUX_ANDROID_RESTORECON_SKIPCE},
|
|
{"--cross-filesystems", SELINUX_ANDROID_RESTORECON_CROSS_FILESYSTEMS},
|
|
{0, 0}};
|
|
|
|
int flag = 0;
|
|
std::vector<std::string> paths;
|
|
|
|
bool in_flags = true;
|
|
for (size_t i = 1; i < args.size(); ++i) {
|
|
if (android::base::StartsWith(args[i], "--")) {
|
|
if (!in_flags) {
|
|
return Error() << "flags must precede paths";
|
|
}
|
|
bool found = false;
|
|
for (size_t j = 0; flags[j].name; ++j) {
|
|
if (args[i] == flags[j].name) {
|
|
flag |= flags[j].value;
|
|
found = true;
|
|
break;
|
|
}
|
|
}
|
|
if (!found) {
|
|
return Error() << "bad flag " << args[i];
|
|
}
|
|
} else {
|
|
in_flags = false;
|
|
paths.emplace_back(args[i]);
|
|
}
|
|
}
|
|
return std::pair(flag, paths);
|
|
}
|
|
|
|
Result<std::string> ParseSwaponAll(const std::vector<std::string>& args) {
|
|
if (args.size() <= 1) {
|
|
if (SelinuxGetVendorAndroidVersion() <= __ANDROID_API_Q__) {
|
|
return Error() << "swapon_all requires at least 1 argument";
|
|
}
|
|
return {};
|
|
}
|
|
return args[1];
|
|
}
|
|
|
|
Result<std::string> ParseUmountAll(const std::vector<std::string>& args) {
|
|
if (args.size() <= 1) {
|
|
if (SelinuxGetVendorAndroidVersion() <= __ANDROID_API_Q__) {
|
|
return Error() << "umount_all requires at least 1 argument";
|
|
}
|
|
return {};
|
|
}
|
|
return args[1];
|
|
}
|
|
|
|
static void InitAborter(const char* abort_message) {
|
|
// When init forks, it continues to use this aborter for LOG(FATAL), but we want children to
|
|
// simply abort instead of trying to reboot the system.
|
|
if (getpid() != 1) {
|
|
android::base::DefaultAborter(abort_message);
|
|
return;
|
|
}
|
|
|
|
InitFatalReboot(SIGABRT);
|
|
}
|
|
|
|
// The kernel opens /dev/console and uses that fd for stdin/stdout/stderr if there is a serial
|
|
// console enabled and no initramfs, otherwise it does not provide any fds for stdin/stdout/stderr.
|
|
// SetStdioToDevNull() is used to close these existing fds if they exist and replace them with
|
|
// /dev/null regardless.
|
|
//
|
|
// In the case that these fds are provided by the kernel, the exec of second stage init causes an
|
|
// SELinux denial as it does not have access to /dev/console. In the case that they are not
|
|
// provided, exec of any further process is potentially dangerous as the first fd's opened by that
|
|
// process will take the stdin/stdout/stderr fileno's, which can cause issues if printf(), etc is
|
|
// then used by that process.
|
|
//
|
|
// Lastly, simply calling SetStdioToDevNull() in first stage init is not enough, since first
|
|
// stage init still runs in kernel context, future child processes will not have permissions to
|
|
// access any fds that it opens, including the one opened below for /dev/null. Therefore,
|
|
// SetStdioToDevNull() must be called again in second stage init.
|
|
void SetStdioToDevNull(char** argv) {
|
|
// Make stdin/stdout/stderr all point to /dev/null.
|
|
int fd = open("/dev/null", O_RDWR); // NOLINT(android-cloexec-open)
|
|
if (fd == -1) {
|
|
int saved_errno = errno;
|
|
android::base::InitLogging(argv, &android::base::KernelLogger, InitAborter);
|
|
errno = saved_errno;
|
|
PLOG(FATAL) << "Couldn't open /dev/null";
|
|
}
|
|
dup2(fd, STDIN_FILENO);
|
|
dup2(fd, STDOUT_FILENO);
|
|
dup2(fd, STDERR_FILENO);
|
|
if (fd > STDERR_FILENO) close(fd);
|
|
}
|
|
|
|
void InitKernelLogging(char** argv) {
|
|
SetFatalRebootTarget();
|
|
android::base::InitLogging(argv, &android::base::KernelLogger, InitAborter);
|
|
}
|
|
|
|
bool IsRecoveryMode() {
|
|
return access("/system/bin/recovery", F_OK) == 0;
|
|
}
|
|
|
|
// Check if default mount namespace is ready to be used with APEX modules
|
|
static bool is_default_mount_namespace_ready = false;
|
|
|
|
bool IsDefaultMountNamespaceReady() {
|
|
return is_default_mount_namespace_ready;
|
|
}
|
|
|
|
void SetDefaultMountNamespaceReady() {
|
|
is_default_mount_namespace_ready = true;
|
|
}
|
|
|
|
#ifdef MTK_LOG
|
|
#if defined(__linux__)
|
|
#define DEFAULT_RATELIMIT_INTERVALMS 5000
|
|
#define DEFAULT_RATELIMIT_BURST 9
|
|
|
|
#define __MAXLOGFD__ 2
|
|
static int klogfd[__MAXLOGFD__] = {-1};
|
|
static uint64_t log_time[__MAXLOGFD__];
|
|
static int log_printed[__MAXLOGFD__] = {0};
|
|
static int inited[__MAXLOGFD__] = {0};
|
|
static uint64_t *plog_time[__MAXLOGFD__] = {NULL};
|
|
|
|
static bool while_flag[__MAXLOGFD__] = {false};
|
|
static uint64_t while_nowms[__MAXLOGFD__] = {0};
|
|
static uint64_t while_ep_duration[__MAXLOGFD__] = {0};
|
|
static bool while_log_piggybacked[__MAXLOGFD__] = {false};
|
|
|
|
#define _SPLIT_PROPSET_ 0
|
|
#define _SPLIT_OTHER_ 1
|
|
|
|
#define MTK_LOG_LINE_MAXCLEN 700
|
|
#define MTK_LOG_LINE_MAXTIME 200
|
|
|
|
struct PropSetLogInfo {
|
|
boot_clock::time_point log_time;
|
|
std::string log;
|
|
};
|
|
|
|
static std::queue<PropSetLogInfo> propsetlog_children;
|
|
static size_t propsetlog_len = 0;
|
|
|
|
static std::mutex _log_lock;
|
|
|
|
static void _KernelLoggerLine_split_final(int fd, int level,
|
|
const char* tag, const char* msg, int length);
|
|
static int _GetSplitFD(int idx);
|
|
|
|
int PropSetLogReap(int force) {
|
|
if (propsetlog_children.empty()) {
|
|
return -1;
|
|
}
|
|
|
|
auto& log = propsetlog_children.front();
|
|
auto duration = boot_clock::now() - log.log_time;
|
|
auto duration_ms =
|
|
std::chrono::duration_cast<std::chrono::milliseconds>(duration).count();
|
|
|
|
if (force ||
|
|
propsetlog_len >= MTK_LOG_LINE_MAXCLEN ||
|
|
duration_ms >= MTK_LOG_LINE_MAXTIME) {
|
|
std::string reap_log("ReapLog");
|
|
|
|
if (propsetlog_len >= MTK_LOG_LINE_MAXCLEN)
|
|
reap_log.append("C");
|
|
else if (force)
|
|
reap_log.append("F");
|
|
else
|
|
reap_log.append("T");
|
|
|
|
reap_log.append(" PropSet");
|
|
|
|
while (!propsetlog_children.empty()) {
|
|
auto& tmplog = propsetlog_children.front();
|
|
|
|
reap_log.append(" ");
|
|
reap_log.append(tmplog.log);
|
|
|
|
propsetlog_children.pop();
|
|
}
|
|
|
|
reap_log.append(" Done");
|
|
propsetlog_len = 0;
|
|
|
|
int fklog_fd = _GetSplitFD(_SPLIT_PROPSET_);
|
|
if (fklog_fd == -1) return -1;
|
|
|
|
_KernelLoggerLine_split_final(fklog_fd, 6, "init", reap_log.c_str(), reap_log.length());
|
|
}
|
|
else {
|
|
return (MTK_LOG_LINE_MAXTIME - duration_ms);
|
|
}
|
|
|
|
return -1;
|
|
}
|
|
|
|
int PropSetHook(const char* msg) {
|
|
int force = 0;
|
|
int vRet = 0;
|
|
|
|
if (android::base::StartsWith(msg, "PropSet ")) {
|
|
|
|
struct PropSetLogInfo LogInfo;
|
|
LogInfo.log_time = boot_clock::now();
|
|
|
|
LogInfo.log.append(StringPrintf("%s%llu",
|
|
msg + 8,
|
|
std::chrono::duration_cast<std::chrono::milliseconds>(LogInfo.log_time.time_since_epoch()).count()));
|
|
|
|
propsetlog_len += LogInfo.log.length();
|
|
propsetlog_children.push(LogInfo);
|
|
|
|
vRet = 1;
|
|
} else if (!propsetlog_children.empty()) {
|
|
force = 1;
|
|
}
|
|
|
|
PropSetLogReap(force);
|
|
|
|
return vRet;
|
|
}
|
|
|
|
#if defined(__linux__)
|
|
static int OpenKmsg() {
|
|
#if defined(__ANDROID__)
|
|
// pick up 'file w /dev/kmsg' environment from daemon's init rc file
|
|
const auto val = getenv("ANDROID_FILE__dev_kmsg");
|
|
if (val != nullptr) {
|
|
int fd;
|
|
if (android::base::ParseInt(val, &fd, 0)) {
|
|
auto flags = fcntl(fd, F_GETFL);
|
|
if ((flags != -1) && ((flags & O_ACCMODE) == O_WRONLY)) return fd;
|
|
}
|
|
}
|
|
#endif
|
|
return -1;
|
|
}
|
|
#endif
|
|
|
|
static int _GetSplitFD(int idx)
|
|
{
|
|
if (idx < 0 || idx >= __MAXLOGFD__)
|
|
return -1;
|
|
|
|
if (!inited[idx]) {
|
|
klogfd[idx] = TEMP_FAILURE_RETRY(open("/dev/kmsg", O_WRONLY | O_CLOEXEC));
|
|
inited[idx] = 1;
|
|
}
|
|
|
|
uint64_t nowms = std::chrono::duration_cast<std::chrono::milliseconds>(boot_clock::now().time_since_epoch()).count();
|
|
|
|
if (plog_time[idx] == NULL) {
|
|
log_time[idx] = nowms;
|
|
plog_time[idx] = &log_time[idx];
|
|
}
|
|
|
|
if (log_printed[idx] >= DEFAULT_RATELIMIT_BURST) {
|
|
int newfd;
|
|
newfd = TEMP_FAILURE_RETRY(open("/dev/kmsg", O_WRONLY | O_CLOEXEC));
|
|
|
|
if (newfd >= 0) {
|
|
close(klogfd[idx]);
|
|
klogfd[idx] = newfd;
|
|
*plog_time[idx] = nowms;
|
|
log_printed[idx] = 0;
|
|
}
|
|
}
|
|
if (nowms >= *plog_time[idx] + DEFAULT_RATELIMIT_INTERVALMS) {
|
|
*plog_time[idx] = nowms;
|
|
log_printed[idx] = 0;
|
|
}
|
|
|
|
log_printed[idx]++;
|
|
|
|
return klogfd[idx];
|
|
}
|
|
|
|
void PropSetLogReset()
|
|
{
|
|
log_printed[_SPLIT_OTHER_] = DEFAULT_RATELIMIT_BURST;
|
|
}
|
|
|
|
#define _TOO_LONG_FIX_ 300
|
|
|
|
static void _KernelLoggerLine_split_final(int fd, int level,
|
|
const char* tag, const char* msg, int length) {
|
|
|
|
// The kernel's printk buffer is only 1024 bytes.
|
|
// TODO: should we automatically break up long lines into multiple lines?
|
|
// Or we could log but with something like "..." at the end?
|
|
char buf[1024] __attribute__((__uninitialized__));
|
|
size_t size;
|
|
|
|
if (gettid() == 1 && while_flag[_SPLIT_OTHER_]) {
|
|
size = snprintf(buf, sizeof(buf), "<%d>%s %d: [%llu][%llu]%.*s\n", level, tag, fd,
|
|
(unsigned long long) while_nowms[_SPLIT_OTHER_],
|
|
(unsigned long long) while_ep_duration[_SPLIT_OTHER_], length, msg);
|
|
while_log_piggybacked[_SPLIT_OTHER_] = true;
|
|
} else if (PropServThrGetTid() == gettid() && while_flag[_SPLIT_PROPSET_]) {
|
|
size = snprintf(buf, sizeof(buf), "<%d>%s %d: [%llu][%llu]%.*s\n", level, tag, fd,
|
|
(unsigned long long) while_nowms[_SPLIT_PROPSET_],
|
|
(unsigned long long) while_ep_duration[_SPLIT_PROPSET_], length, msg);
|
|
while_log_piggybacked[_SPLIT_PROPSET_] = true;
|
|
} else {
|
|
size = snprintf(buf, sizeof(buf), "<%d>%s %d: %.*s\n", level, tag, fd, length, msg);
|
|
}
|
|
|
|
if (size > sizeof(buf) && length == -1) {
|
|
size = snprintf(buf + _TOO_LONG_FIX_, sizeof(buf) - _TOO_LONG_FIX_, "../~/..%.*s\n",
|
|
_TOO_LONG_FIX_, msg + (strlen(msg) - _TOO_LONG_FIX_)) + _TOO_LONG_FIX_;
|
|
}
|
|
|
|
if (size > sizeof(buf)) {
|
|
size = snprintf(buf, sizeof(buf), "<%d>%s: %zu-byte message too long for printk\n",
|
|
level, tag, size);
|
|
}
|
|
|
|
if (size <= 0)
|
|
return;
|
|
|
|
iovec iov[1];
|
|
iov[0].iov_base = buf;
|
|
iov[0].iov_len = size;
|
|
TEMP_FAILURE_RETRY(writev(fd, iov, 1));
|
|
}
|
|
|
|
static void _KernelLoggerLine_split_lock(int level,
|
|
const char* tag, const char* msg, int length) {
|
|
_log_lock.lock();
|
|
|
|
int fklog_fd = _GetSplitFD(_SPLIT_OTHER_);
|
|
if (fklog_fd == -1) {
|
|
_log_lock.unlock();
|
|
return;
|
|
}
|
|
|
|
_KernelLoggerLine_split_final(fklog_fd, level, tag, msg, length);
|
|
_log_lock.unlock();
|
|
}
|
|
|
|
// This splits the message up line by line, by calling log_function with a pointer to the start of
|
|
// each line and the size up to the newline character. It sends size = -1 for the final line.
|
|
template <typename F, typename... Args>
|
|
static void SplitByLines(const char* msg, const F& log_function, Args&&... args) {
|
|
const char* newline = strchr(msg, '\n');
|
|
while (newline != nullptr) {
|
|
log_function(msg, newline - msg, args...);
|
|
msg = newline + 1;
|
|
newline = strchr(msg, '\n');
|
|
}
|
|
|
|
log_function(msg, -1, args...);
|
|
}
|
|
|
|
static void KernelLoggerLine_split(const char* msg, int length, android::base::LogSeverity severity,
|
|
const char* tag) {
|
|
// clang-format off
|
|
static constexpr int kLogSeverityToKernelLogLevel[] = {
|
|
[android::base::VERBOSE] = 7, // KERN_DEBUG (there is no verbose kernel log
|
|
// level)
|
|
[android::base::DEBUG] = 7, // KERN_DEBUG
|
|
[android::base::INFO] = 6, // KERN_INFO
|
|
[android::base::WARNING] = 4, // KERN_WARNING
|
|
[android::base::ERROR] = 3, // KERN_ERROR
|
|
[android::base::FATAL_WITHOUT_ABORT] = 2, // KERN_CRIT
|
|
[android::base::FATAL] = 2, // KERN_CRIT
|
|
};
|
|
// clang-format on
|
|
static_assert(arraysize(kLogSeverityToKernelLogLevel) == android::base::FATAL + 1,
|
|
"Mismatch in size of kLogSeverityToKernelLogLevel and values in LogSeverity");
|
|
|
|
int fklog_fd;
|
|
|
|
if (isPropServThrStart() == 0 || PropServThrGetTid() == gettid()) {
|
|
if (PropSetHook(msg))
|
|
return;
|
|
}
|
|
|
|
if (getpid() != 1) {
|
|
int klog_fd = _GetSplitFD(_SPLIT_OTHER_);
|
|
if (klog_fd == -1) return;
|
|
int level = kLogSeverityToKernelLogLevel[severity];
|
|
_KernelLoggerLine_split_final(klog_fd, level, tag, msg, length);
|
|
} else if (PropServThrGetTid() == gettid()) {
|
|
fklog_fd = _GetSplitFD(_SPLIT_PROPSET_);
|
|
|
|
if (fklog_fd == -1) return;
|
|
|
|
int level = kLogSeverityToKernelLogLevel[severity];
|
|
|
|
_KernelLoggerLine_split_final(fklog_fd, level, tag, msg, length);
|
|
} else {
|
|
int level = kLogSeverityToKernelLogLevel[severity];
|
|
|
|
_KernelLoggerLine_split_lock(level, tag, msg, length);
|
|
}
|
|
}
|
|
|
|
void KernelLogger_split(android::base::LogId, android::base::LogSeverity severity, const char* tag,
|
|
const char*, unsigned int, const char* full_message) {
|
|
SplitByLines(full_message, KernelLoggerLine_split, severity, tag);
|
|
}
|
|
#endif // #if defined(__linux__)
|
|
|
|
void InitKernelLogging_split(char** argv) {
|
|
if (OpenKmsg() != -1)
|
|
return InitKernelLogging(argv);
|
|
|
|
SetFatalRebootTarget();
|
|
android::base::InitLogging(argv, KernelLogger_split, InitAborter);
|
|
}
|
|
|
|
#if 0
|
|
int selinux_klog_split_callback(int type, const char *fmt, ...) {
|
|
android::base::LogSeverity severity = android::base::ERROR;
|
|
if (type == SELINUX_WARNING) {
|
|
severity = android::base::WARNING;
|
|
} else if (type == SELINUX_INFO) {
|
|
severity = android::base::INFO;
|
|
}
|
|
char buf[1024];
|
|
va_list ap;
|
|
va_start(ap, fmt);
|
|
vsnprintf(buf, sizeof(buf), fmt, ap);
|
|
va_end(ap);
|
|
_KernelLogger_split(android::base::MAIN, severity, "selinux", nullptr, 0, buf);
|
|
return 0;
|
|
}
|
|
#endif // #if 0
|
|
|
|
// This function sets up SELinux logging to be written to kmsg, to match init's logging.
|
|
int SelinuxSetupKernelLogging_split_check() {
|
|
return OpenKmsg();
|
|
}
|
|
|
|
static int PropServThrStart = 0;
|
|
static pid_t PropServThrTid = 0;
|
|
|
|
void SetPropServThrStart(int flag) {
|
|
PropServThrStart = flag;
|
|
}
|
|
|
|
int isPropServThrStart(void) {
|
|
return PropServThrStart;
|
|
}
|
|
|
|
void PropServThrSetTid(pid_t newtid) {
|
|
PropServThrTid = newtid;
|
|
}
|
|
|
|
pid_t PropServThrGetTid(void) {
|
|
return PropServThrTid;
|
|
}
|
|
|
|
void Setwhiletime(int target, uint64_t duration, uint64_t nowms) {
|
|
|
|
if (target != _SPLIT_OTHER_ && target != _SPLIT_PROPSET_)
|
|
return;
|
|
|
|
while_nowms[target] = nowms;
|
|
while_ep_duration[target] = duration;
|
|
|
|
if (!while_flag[target])
|
|
while_flag[target] = true;
|
|
|
|
while_log_piggybacked[target] = false;
|
|
}
|
|
|
|
bool Getwhilepiggybacketed(int target) {
|
|
if (target != _SPLIT_OTHER_ && target != _SPLIT_PROPSET_)
|
|
return true;
|
|
|
|
return while_log_piggybacked[target];
|
|
}
|
|
|
|
uint64_t Getwhileepduration(int target) {
|
|
if (target != _SPLIT_OTHER_ && target != _SPLIT_PROPSET_)
|
|
return 0;
|
|
|
|
return while_ep_duration[target];
|
|
}
|
|
|
|
static android::base::Timer _PropertyFlowTraceTimer;
|
|
static std::queue<std::string> _PropertyFlowTraceQueue;
|
|
static bool _isInPropertyFlowTrace = false;
|
|
|
|
void StartPropertyFlowTraceLog(void) {
|
|
android::base::Timer t;
|
|
_PropertyFlowTraceTimer = t;
|
|
|
|
while (!_PropertyFlowTraceQueue.empty())
|
|
_PropertyFlowTraceQueue.pop();
|
|
|
|
_isInPropertyFlowTrace = true;
|
|
|
|
SnapshotPropertyFlowTraceLog("SPFTL");
|
|
}
|
|
|
|
void SnapshotPropertyFlowTraceLog(const std::string& log) {
|
|
std::string s;
|
|
|
|
if (!_isInPropertyFlowTrace)
|
|
return;
|
|
|
|
uint64_t nowms = std::chrono::duration_cast<std::chrono::milliseconds>(boot_clock::now().time_since_epoch()).count();
|
|
|
|
s.append(log);
|
|
s.append("[");
|
|
s.append(StringPrintf("%llu", (unsigned long long) nowms));
|
|
s.append("] ");
|
|
|
|
_PropertyFlowTraceQueue.push(s);
|
|
}
|
|
|
|
void EndPropertyFlowTraceLog(void) {
|
|
std::string s;
|
|
auto duration = _PropertyFlowTraceTimer.duration();
|
|
|
|
SnapshotPropertyFlowTraceLog("EPFTL");
|
|
|
|
if (_isInPropertyFlowTrace && duration >= 2000ms) {
|
|
s.append(StringPrintf("PropertyFlow took %llu ms, ", (unsigned long long) duration.count()));
|
|
while (!_PropertyFlowTraceQueue.empty()) {
|
|
s.append(_PropertyFlowTraceQueue.front());
|
|
_PropertyFlowTraceQueue.pop();
|
|
}
|
|
|
|
LOG(INFO) << s;
|
|
}
|
|
|
|
while (!_PropertyFlowTraceQueue.empty())
|
|
_PropertyFlowTraceQueue.pop();
|
|
|
|
_isInPropertyFlowTrace = false;
|
|
}
|
|
|
|
static int _mtklogdisableratelimit = 0;
|
|
|
|
void SetMTKLOGDISABLERATELIMIT(void) {
|
|
_mtklogdisableratelimit = 1;
|
|
}
|
|
|
|
int GetMTKLOGDISABLERATELIMIT(void) {
|
|
return _mtklogdisableratelimit;
|
|
}
|
|
#endif
|
|
|
|
#ifdef MTK_TRACE
|
|
static int marker_fd = -1;
|
|
|
|
static int OpenTrace(int force) {
|
|
if (marker_fd != -1 || !force)
|
|
return marker_fd;
|
|
|
|
marker_fd = open("/sys/kernel/debug/tracing/trace_marker", O_WRONLY | O_CLOEXEC);
|
|
if (marker_fd == -1)
|
|
marker_fd = open("/sys/kernel/tracing/trace_marker", O_WRONLY | O_CLOEXEC);
|
|
|
|
return marker_fd;
|
|
}
|
|
|
|
void StartWriteTrace(const char* tracemsg, int pid) {
|
|
int fd = OpenTrace(1);
|
|
int _pid = pid ? pid : getpid();
|
|
char msg[256];
|
|
int ret;
|
|
|
|
if (fd != -1) {
|
|
snprintf(msg, 256, "B|%d|%s", _pid, tracemsg);
|
|
ret = write(fd, msg, strlen(msg));
|
|
}
|
|
}
|
|
|
|
void EndWriteTrace(int pid) {
|
|
int fd = OpenTrace(0);
|
|
int _pid = pid ? pid : getpid();
|
|
char msg[256];
|
|
int ret;
|
|
|
|
if (fd != -1) {
|
|
snprintf(msg, 256, "E|%d", _pid);
|
|
ret = write(fd, msg, strlen(msg));
|
|
}
|
|
}
|
|
#endif
|
|
|
|
} // namespace init
|
|
} // namespace android
|