mirror of
https://github.com/RGBCube/serenity
synced 2025-10-31 09:52:44 +00:00
0bbd9040ef
These 2 are an actual separate types of syscalls, so let's stop using special flags for bind mounting or re-mounting and instead let userspace calling directly for this kind of actions.
568 lines
20 KiB
C++
568 lines
20 KiB
C++
/*
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* Copyright (c) 2018-2021, Andreas Kling <kling@serenityos.org>
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* Copyright (c) 2021, Peter Elliott <pelliott@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include "Service.h"
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#include <AK/Assertions.h>
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#include <AK/ByteBuffer.h>
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#include <AK/Debug.h>
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#include <AK/String.h>
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#include <Kernel/API/DeviceEvent.h>
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#include <LibCore/ArgsParser.h>
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#include <LibCore/ConfigFile.h>
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#include <LibCore/DirIterator.h>
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#include <LibCore/Event.h>
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#include <LibCore/EventLoop.h>
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#include <LibCore/File.h>
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#include <LibCore/System.h>
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#include <LibMain/Main.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <grp.h>
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#include <signal.h>
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#include <stdio.h>
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#include <sys/stat.h>
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#include <sys/sysmacros.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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DeprecatedString g_system_mode = "graphical";
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Vector<NonnullRefPtr<Service>> g_services;
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// NOTE: This handler ensures that the destructor of g_services is called.
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static void sigterm_handler(int)
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{
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exit(0);
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}
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static void sigchld_handler(int)
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{
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for (;;) {
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int status = 0;
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pid_t pid = waitpid(-1, &status, WNOHANG);
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if (pid < 0) {
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perror("waitpid");
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break;
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}
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if (pid == 0)
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break;
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dbgln_if(SYSTEMSERVER_DEBUG, "Reaped child with pid {}, exit status {}", pid, status);
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Service* service = Service::find_by_pid(pid);
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if (service == nullptr) {
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// This can happen for multi-instance services.
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continue;
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}
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if (auto result = service->did_exit(status); result.is_error())
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dbgln("{}: {}", service->name(), result.release_error());
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}
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}
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static ErrorOr<void> determine_system_mode()
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{
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ArmedScopeGuard declare_text_mode_on_failure([&] {
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// Note: Only if the mode is not set to self-test, degrade it to text mode.
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if (g_system_mode != "self-test")
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g_system_mode = "text";
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});
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auto file_or_error = Core::File::open("/sys/kernel/constants/system_mode"sv, Core::File::OpenMode::Read);
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if (file_or_error.is_error()) {
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dbgln("Failed to read system_mode: {}", file_or_error.error());
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// Continue and assume "text" mode.
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return {};
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}
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auto const system_mode_buf_or_error = file_or_error.value()->read_until_eof();
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if (system_mode_buf_or_error.is_error()) {
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dbgln("Failed to read system_mode: {}", system_mode_buf_or_error.error());
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// Continue and assume "text" mode.
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return {};
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}
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DeprecatedString const system_mode = DeprecatedString::copy(system_mode_buf_or_error.value(), Chomp);
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g_system_mode = system_mode;
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declare_text_mode_on_failure.disarm();
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dbgln("Read system_mode: {}", g_system_mode);
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struct stat file_state;
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int rc = lstat("/dev/gpu/connector0", &file_state);
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if (rc != 0 && g_system_mode == "graphical") {
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dbgln("WARNING: No device nodes at /dev/gpu/ directory. This is probably a sign of disabled graphics functionality.");
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dbgln("To cope with this, I'll turn off graphical mode.");
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g_system_mode = "text";
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}
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return {};
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}
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static ErrorOr<void> chown_all_matching_device_nodes_under_specific_directory(StringView directory, group const& group)
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{
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struct stat cur_file_stat;
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Core::DirIterator di(directory, Core::DirIterator::SkipParentAndBaseDir);
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if (di.has_error())
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VERIFY_NOT_REACHED();
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while (di.has_next()) {
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auto entry_name = di.next_full_path();
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auto rc = stat(entry_name.characters(), &cur_file_stat);
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if (rc < 0)
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continue;
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TRY(Core::System::chown(entry_name, 0, group.gr_gid));
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}
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return {};
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}
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static ErrorOr<void> chown_all_matching_device_nodes(group const& group, unsigned major_number)
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{
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struct stat cur_file_stat;
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Core::DirIterator di("/dev/", Core::DirIterator::SkipParentAndBaseDir);
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if (di.has_error())
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VERIFY_NOT_REACHED();
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while (di.has_next()) {
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auto entry_name = di.next_full_path();
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auto rc = stat(entry_name.characters(), &cur_file_stat);
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if (rc < 0)
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continue;
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if (major(cur_file_stat.st_rdev) != major_number)
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continue;
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TRY(Core::System::chown(entry_name, 0, group.gr_gid));
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}
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return {};
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}
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inline char offset_character_with_number(char base_char, u8 offset)
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{
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char offsetted_char = base_char;
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VERIFY(static_cast<size_t>(offsetted_char) + static_cast<size_t>(offset) < 256);
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offsetted_char += offset;
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return offsetted_char;
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}
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static ErrorOr<void> create_devtmpfs_block_device(StringView name, mode_t mode, unsigned major, unsigned minor)
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{
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return Core::System::mknod(name, mode | S_IFBLK, makedev(major, minor));
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}
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static ErrorOr<void> create_devtmpfs_char_device(StringView name, mode_t mode, unsigned major, unsigned minor)
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{
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return Core::System::mknod(name, mode | S_IFCHR, makedev(major, minor));
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}
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static ErrorOr<void> populate_devtmpfs_char_devices_based_on_sysfs()
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{
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Core::DirIterator di("/sys/dev/char/", Core::DirIterator::SkipParentAndBaseDir);
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if (di.has_error()) {
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auto error = di.error();
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warnln("Failed to open /sys/dev/char - {}", error);
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return error;
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}
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while (di.has_next()) {
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auto entry_name = di.next_path().split(':');
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VERIFY(entry_name.size() == 2);
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auto major_number = entry_name[0].to_uint<unsigned>().value();
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auto minor_number = entry_name[1].to_uint<unsigned>().value();
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switch (major_number) {
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case 2: {
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switch (minor_number) {
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case 10: {
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TRY(create_devtmpfs_char_device("/dev/devctl"sv, 0660, 2, 10));
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break;
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}
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default:
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warnln("Unknown character device {}:{}", major_number, minor_number);
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}
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break;
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}
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default:
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break;
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}
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}
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return {};
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}
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static ErrorOr<bool> read_one_or_eof(NonnullOwnPtr<Core::File>& file, DeviceEvent& event)
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{
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auto const read_buf = TRY(file->read_some({ (u8*)&event, sizeof(DeviceEvent) }));
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if (read_buf.size() == sizeof(DeviceEvent)) {
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// Good! We could read another DeviceEvent.
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return true;
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}
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if (file->is_eof()) {
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// Good! We have reached the "natural" end of the file.
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return false;
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}
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// Bad! Kernel and SystemServer apparently disagree on the record size,
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// which means that previous data is likely to be invalid.
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return Error::from_string_view("File ended after incomplete record? /dev/devctl seems broken!"sv);
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}
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static ErrorOr<void> populate_devtmpfs_devices_based_on_devctl()
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{
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auto file_or_error = Core::File::open("/dev/devctl"sv, Core::File::OpenMode::Read);
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if (file_or_error.is_error()) {
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warnln("Failed to open /dev/devctl - {}", file_or_error.error());
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VERIFY_NOT_REACHED();
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}
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auto file = file_or_error.release_value();
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DeviceEvent event;
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while (TRY(read_one_or_eof(file, event))) {
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if (event.state != DeviceEvent::Inserted)
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continue;
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auto major_number = event.major_number;
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auto minor_number = event.minor_number;
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bool is_block_device = (event.is_block_device == 1);
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switch (major_number) {
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case 116: {
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if (!is_block_device) {
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auto name = TRY(String::formatted("/dev/audio/{}", minor_number));
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TRY(create_devtmpfs_char_device(name.bytes_as_string_view(), 0220, 116, minor_number));
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break;
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}
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break;
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}
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case 28: {
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auto name = TRY(String::formatted("/dev/gpu/render{}", minor_number));
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TRY(create_devtmpfs_block_device(name.bytes_as_string_view(), 0666, 28, minor_number));
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break;
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}
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case 226: {
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auto name = TRY(String::formatted("/dev/gpu/connector{}", minor_number));
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TRY(create_devtmpfs_char_device(name.bytes_as_string_view(), 0666, 226, minor_number));
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break;
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}
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case 229: {
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if (!is_block_device) {
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auto name = TRY(String::formatted("/dev/hvc0p{}", minor_number));
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TRY(create_devtmpfs_char_device(name.bytes_as_string_view(), 0666, 229, minor_number));
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}
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break;
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}
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case 10: {
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if (!is_block_device) {
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switch (minor_number) {
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case 0: {
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TRY(create_devtmpfs_char_device("/dev/input/mouse/0"sv, 0666, 10, 0));
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break;
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}
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default:
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warnln("Unknown character device {}:{}", major_number, minor_number);
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}
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}
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break;
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}
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case 85: {
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if (!is_block_device) {
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switch (minor_number) {
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case 0: {
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TRY(create_devtmpfs_char_device("/dev/input/keyboard/0"sv, 0666, 85, 0));
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break;
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}
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default:
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warnln("Unknown character device {}:{}", major_number, minor_number);
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}
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}
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break;
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}
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case 1: {
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if (!is_block_device) {
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switch (minor_number) {
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case 5: {
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TRY(create_devtmpfs_char_device("/dev/zero"sv, 0666, 1, 5));
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break;
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}
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case 1: {
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TRY(create_devtmpfs_char_device("/dev/mem"sv, 0666, 1, 1));
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break;
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}
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case 3: {
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TRY(create_devtmpfs_char_device("/dev/null"sv, 0666, 1, 3));
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break;
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}
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case 7: {
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TRY(create_devtmpfs_char_device("/dev/full"sv, 0666, 1, 7));
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break;
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}
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case 8: {
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TRY(create_devtmpfs_char_device("/dev/random"sv, 0666, 1, 8));
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break;
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}
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default:
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warnln("Unknown character device {}:{}", major_number, minor_number);
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break;
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}
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}
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break;
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}
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case 30: {
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if (!is_block_device) {
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auto name = TRY(String::formatted("/dev/kcov{}", minor_number));
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TRY(create_devtmpfs_char_device(name.bytes_as_string_view(), 0666, 30, minor_number));
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}
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break;
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}
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case 3: {
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if (is_block_device) {
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auto name = TRY(String::formatted("/dev/hd{}", offset_character_with_number('a', minor_number)));
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TRY(create_devtmpfs_block_device(name.bytes_as_string_view(), 0600, 3, minor_number));
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}
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break;
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}
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case 5: {
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if (!is_block_device) {
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switch (minor_number) {
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case 1: {
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TRY(create_devtmpfs_char_device("/dev/console"sv, 0666, 5, 1));
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break;
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}
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case 2: {
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TRY(create_devtmpfs_char_device("/dev/ptmx"sv, 0666, 5, 2));
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break;
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}
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case 0: {
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TRY(create_devtmpfs_char_device("/dev/tty"sv, 0666, 5, 0));
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break;
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}
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default:
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warnln("Unknown character device {}:{}", major_number, minor_number);
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}
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}
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break;
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}
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case 4: {
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if (!is_block_device) {
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switch (minor_number) {
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case 0: {
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TRY(create_devtmpfs_char_device("/dev/tty0"sv, 0620, 4, 0));
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break;
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}
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case 1: {
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TRY(create_devtmpfs_char_device("/dev/tty1"sv, 0620, 4, 1));
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break;
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}
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case 2: {
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TRY(create_devtmpfs_char_device("/dev/tty2"sv, 0620, 4, 2));
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break;
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}
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case 3: {
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TRY(create_devtmpfs_char_device("/dev/tty3"sv, 0620, 4, 3));
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break;
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}
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case 64: {
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TRY(create_devtmpfs_char_device("/dev/ttyS0"sv, 0620, 4, 64));
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break;
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}
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case 65: {
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TRY(create_devtmpfs_char_device("/dev/ttyS1"sv, 0620, 4, 65));
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break;
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}
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case 66: {
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TRY(create_devtmpfs_char_device("/dev/ttyS2"sv, 0620, 4, 66));
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break;
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}
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case 67: {
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TRY(create_devtmpfs_char_device("/dev/ttyS3"sv, 0666, 4, 67));
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break;
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}
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default:
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warnln("Unknown character device {}:{}", major_number, minor_number);
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}
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}
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break;
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}
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default:
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if (!is_block_device)
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warnln("Unknown character device {}:{}", major_number, minor_number);
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else
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warnln("Unknown block device {}:{}", major_number, minor_number);
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break;
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}
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}
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return {};
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}
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static ErrorOr<void> populate_devtmpfs()
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{
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mode_t old_mask = umask(0);
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printf("Changing umask %#o\n", old_mask);
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TRY(populate_devtmpfs_char_devices_based_on_sysfs());
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TRY(populate_devtmpfs_devices_based_on_devctl());
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umask(old_mask);
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return {};
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}
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static ErrorOr<void> prepare_synthetic_filesystems()
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{
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TRY(Core::System::remount("/"sv, MS_NODEV | MS_NOSUID | MS_RDONLY));
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// FIXME: Find a better way to all of this stuff, without hardcoding all of this!
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TRY(Core::System::mount(-1, "/proc"sv, "proc"sv, MS_NOSUID));
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TRY(Core::System::mount(-1, "/sys"sv, "sys"sv, 0));
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TRY(Core::System::mount(-1, "/dev"sv, "ram"sv, MS_NOSUID | MS_NOEXEC | MS_NOREGULAR));
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TRY(Core::System::mount(-1, "/tmp"sv, "ram"sv, MS_NOSUID | MS_NODEV));
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// NOTE: Set /tmp to have a sticky bit with 0777 permissions.
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TRY(Core::System::chmod("/tmp"sv, 01777));
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TRY(Core::System::mkdir("/dev/audio"sv, 0755));
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TRY(Core::System::mkdir("/dev/input"sv, 0755));
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TRY(Core::System::mkdir("/dev/input/keyboard"sv, 0755));
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TRY(Core::System::mkdir("/dev/input/mouse"sv, 0755));
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TRY(Core::System::symlink("/proc/self/fd/0"sv, "/dev/stdin"sv));
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TRY(Core::System::symlink("/proc/self/fd/1"sv, "/dev/stdout"sv));
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TRY(Core::System::symlink("/proc/self/fd/2"sv, "/dev/stderr"sv));
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TRY(Core::System::mkdir("/dev/gpu"sv, 0755));
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TRY(populate_devtmpfs());
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TRY(Core::System::mkdir("/dev/pts"sv, 0755));
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TRY(Core::System::mount(-1, "/dev/pts"sv, "devpts"sv, 0));
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TRY(Core::System::symlink("/dev/random"sv, "/dev/urandom"sv));
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TRY(Core::System::chmod("/dev/urandom"sv, 0666));
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auto phys_group = TRY(Core::System::getgrnam("phys"sv));
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VERIFY(phys_group.has_value());
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// FIXME: Try to find a way to not hardcode the major number of display connector device nodes.
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TRY(chown_all_matching_device_nodes(phys_group.value(), 29));
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auto const filter_chown_ENOENT = [](ErrorOr<void> result) -> ErrorOr<void> {
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auto const chown_enoent = Error::from_syscall("chown"sv, -ENOENT);
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if (result.is_error() && result.error() == chown_enoent) {
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dbgln("{}", result.release_error());
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return {};
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}
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return result;
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};
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TRY(filter_chown_ENOENT(Core::System::chown("/dev/input/keyboard/0"sv, 0, phys_group.value().gr_gid)));
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TRY(filter_chown_ENOENT(Core::System::chown("/dev/input/mouse/0"sv, 0, phys_group.value().gr_gid)));
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auto tty_group = TRY(Core::System::getgrnam("tty"sv));
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VERIFY(tty_group.has_value());
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// FIXME: Try to find a way to not hardcode the major number of tty nodes.
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TRY(chown_all_matching_device_nodes(tty_group.release_value(), 4));
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auto audio_group = TRY(Core::System::getgrnam("audio"sv));
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VERIFY(audio_group.has_value());
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TRY(Core::System::chown("/dev/audio"sv, 0, audio_group->gr_gid));
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TRY(chown_all_matching_device_nodes_under_specific_directory("/dev/audio"sv, audio_group.release_value()));
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// Note: We open the /dev/null device and set file descriptors 0, 1, 2 to it
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// because otherwise these file descriptors won't have a custody, making
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// the ProcFS file descriptor links (at /proc/PID/fd/{0,1,2}) to have an
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// absolute path of "device:1,3" instead of something like "/dev/null".
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// This affects also every other process that inherits the file descriptors
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// from SystemServer, so it is important for other things (also for ProcFS
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// tests that are running in CI mode).
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int stdin_new_fd = TRY(Core::System::open("/dev/null"sv, O_NONBLOCK));
|
|
|
|
TRY(Core::System::dup2(stdin_new_fd, 0));
|
|
TRY(Core::System::dup2(stdin_new_fd, 1));
|
|
TRY(Core::System::dup2(stdin_new_fd, 2));
|
|
|
|
TRY(Core::System::endgrent());
|
|
return {};
|
|
}
|
|
|
|
static ErrorOr<void> mount_all_filesystems()
|
|
{
|
|
dbgln("Spawning mount -a to mount all filesystems.");
|
|
pid_t pid = TRY(Core::System::fork());
|
|
|
|
if (pid == 0)
|
|
TRY(Core::System::exec("/bin/mount"sv, Vector { "mount"sv, "-a"sv }, Core::System::SearchInPath::No));
|
|
|
|
wait(nullptr);
|
|
return {};
|
|
}
|
|
|
|
static ErrorOr<void> create_tmp_coredump_directory()
|
|
{
|
|
dbgln("Creating /tmp/coredump directory");
|
|
auto old_umask = umask(0);
|
|
// FIXME: the coredump directory should be made read-only once CrashDaemon is no longer responsible for compressing coredumps
|
|
TRY(Core::System::mkdir("/tmp/coredump"sv, 0777));
|
|
umask(old_umask);
|
|
return {};
|
|
}
|
|
|
|
static ErrorOr<void> set_default_coredump_directory()
|
|
{
|
|
dbgln("Setting /tmp/coredump as the coredump directory");
|
|
auto sysfs_coredump_directory_variable_fd = TRY(Core::System::open("/sys/kernel/variables/coredump_directory"sv, O_RDWR));
|
|
ScopeGuard close_on_exit([&] {
|
|
close(sysfs_coredump_directory_variable_fd);
|
|
});
|
|
auto tmp_coredump_directory_path = "/tmp/coredump"sv;
|
|
auto nwritten = TRY(Core::System::write(sysfs_coredump_directory_variable_fd, tmp_coredump_directory_path.bytes()));
|
|
VERIFY(static_cast<size_t>(nwritten) == tmp_coredump_directory_path.length());
|
|
return {};
|
|
}
|
|
|
|
static ErrorOr<void> create_tmp_semaphore_directory()
|
|
{
|
|
dbgln("Creating /tmp/semaphore directory");
|
|
auto old_umask = umask(0);
|
|
TRY(Core::System::mkdir("/tmp/semaphore"sv, 0777));
|
|
umask(old_umask);
|
|
return {};
|
|
}
|
|
|
|
ErrorOr<int> serenity_main(Main::Arguments arguments)
|
|
{
|
|
bool user = false;
|
|
Core::ArgsParser args_parser;
|
|
args_parser.add_option(user, "Run in user-mode", "user", 'u');
|
|
args_parser.parse(arguments);
|
|
|
|
if (!user) {
|
|
TRY(mount_all_filesystems());
|
|
TRY(prepare_synthetic_filesystems());
|
|
}
|
|
|
|
TRY(Core::System::pledge("stdio proc exec tty accept unix rpath wpath cpath chown fattr id sigaction"));
|
|
|
|
if (!user) {
|
|
TRY(create_tmp_coredump_directory());
|
|
TRY(set_default_coredump_directory());
|
|
TRY(create_tmp_semaphore_directory());
|
|
TRY(determine_system_mode());
|
|
}
|
|
|
|
Core::EventLoop event_loop;
|
|
|
|
event_loop.register_signal(SIGCHLD, sigchld_handler);
|
|
event_loop.register_signal(SIGTERM, sigterm_handler);
|
|
|
|
// Read our config and instantiate services.
|
|
// This takes care of setting up sockets.
|
|
auto config = (user)
|
|
? TRY(Core::ConfigFile::open_for_app("SystemServer"))
|
|
: TRY(Core::ConfigFile::open_for_system("SystemServer"));
|
|
for (auto const& name : config->groups()) {
|
|
auto service = TRY(Service::try_create(*config, name));
|
|
if (service->is_enabled())
|
|
g_services.append(move(service));
|
|
}
|
|
|
|
// After we've set them all up, activate them!
|
|
dbgln("Activating {} services...", g_services.size());
|
|
for (auto& service : g_services) {
|
|
if (auto result = service->activate(); result.is_error())
|
|
dbgln("{}: {}", service->name(), result.release_error());
|
|
}
|
|
|
|
return event_loop.exec();
|
|
}
|