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SystemServer: Use more LibCore syscall wrappers :^)

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This commit is contained in:
Andreas Kling 2021-12-16 21:02:26 +01:00
parent 2637a64130
commit 87b1ad2356
1 changed files with 32 additions and 81 deletions
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113
Userland/Services/SystemServer/main.cpp
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@ -53,19 +53,19 @@ static void sigchld_handler(int)
}
}
static void determine_system_mode()
static ErrorOr<void> determine_system_mode()
{
auto f = Core::File::construct("/proc/system_mode");
if (!f->open(Core::OpenMode::ReadOnly)) {
dbgln("Failed to read system_mode: {}", f->error_string());
// Continue to assume "graphical".
return;
return {};
}
const String system_mode = String::copy(f->read_all(), Chomp);
if (f->error()) {
dbgln("Failed to read system_mode: {}", f->error_string());
// Continue to assume "graphical".
return;
return {};
}
g_system_mode = system_mode;
@ -80,6 +80,7 @@ static void determine_system_mode()
dbgln("WARNING: Text mode with framebuffers won't work as expected! Consider using 'fbdev=off'.");
}
dbgln("System in {} mode", g_system_mode);
return {};
}
static void chown_wrapper(const char* path, uid_t uid, gid_t gid)
@ -332,60 +333,26 @@ static void populate_devfs()
umask(old_mask);
}
static void prepare_synthetic_filesystems()
static ErrorOr<void> prepare_synthetic_filesystems()
{
// FIXME: Find a better way to all of this stuff, without hardcoding all of this!
int rc = mount(-1, "/proc", "proc", MS_NOSUID);
if (rc != 0) {
VERIFY_NOT_REACHED();
}
TRY(Core::System::mount(-1, "/proc", "proc", MS_NOSUID));
TRY(Core::System::mount(-1, "/sys", "sys", 0));
TRY(Core::System::mount(-1, "/dev", "dev", 0));
rc = mount(-1, "/sys", "sys", 0);
if (rc != 0) {
VERIFY_NOT_REACHED();
}
rc = mount(-1, "/dev", "dev", 0);
if (rc != 0) {
VERIFY_NOT_REACHED();
}
rc = symlink("/proc/self/fd/0", "/dev/stdin");
if (rc < 0) {
VERIFY_NOT_REACHED();
}
rc = symlink("/proc/self/fd/1", "/dev/stdout");
if (rc < 0) {
VERIFY_NOT_REACHED();
}
rc = symlink("/proc/self/fd/2", "/dev/stderr");
if (rc < 0) {
VERIFY_NOT_REACHED();
}
rc = symlink("/proc/self/tty", "/dev/tty");
if (rc < 0) {
VERIFY_NOT_REACHED();
}
TRY(Core::System::symlink("/proc/self/fd/0", "/dev/stdin"));
TRY(Core::System::symlink("/proc/self/fd/1", "/dev/stdout"));
TRY(Core::System::symlink("/proc/self/fd/2", "/dev/stderr"));
TRY(Core::System::symlink("/proc/self/tty", "/dev/tty"));
populate_devfs();
rc = mkdir("/dev/pts", 0755);
if (rc != 0) {
VERIFY_NOT_REACHED();
}
TRY(Core::System::mkdir("/dev/pts", 0755));
rc = mount(-1, "/dev/pts", "devpts", 0);
if (rc != 0) {
VERIFY_NOT_REACHED();
}
TRY(Core::System::mount(-1, "/dev/pts", "devpts", 0));
TRY(Core::System::symlink("/dev/random", "/dev/urandom"));
rc = symlink("/dev/random", "/dev/urandom");
if (rc < 0) {
VERIFY_NOT_REACHED();
}
chmod_wrapper("/dev/urandom", 0666);
auto phys_group = getgrnam("phys");
@ -413,55 +380,39 @@ static void prepare_synthetic_filesystems()
// This affects also every other process that inherits the file descriptors
// from SystemServer, so it is important for other things (also for ProcFS
// tests that are running in CI mode).
int stdin_new_fd = open("/dev/null", O_NONBLOCK);
if (stdin_new_fd < 0) {
VERIFY_NOT_REACHED();
}
rc = dup2(stdin_new_fd, 0);
if (rc < 0) {
VERIFY_NOT_REACHED();
}
int stdin_new_fd = TRY(Core::System::open("/dev/null", O_NONBLOCK));
rc = dup2(stdin_new_fd, 1);
if (rc < 0) {
VERIFY_NOT_REACHED();
}
rc = dup2(stdin_new_fd, 2);
if (rc < 0) {
VERIFY_NOT_REACHED();
}
TRY(Core::System::dup2(stdin_new_fd, 0));
TRY(Core::System::dup2(stdin_new_fd, 1));
TRY(Core::System::dup2(stdin_new_fd, 2));
endgrent();
return {};
}
static void mount_all_filesystems()
static ErrorOr<void> mount_all_filesystems()
{
dbgln("Spawning mount -a to mount all filesystems.");
pid_t pid = fork();
pid_t pid = TRY(Core::System::fork());
if (pid < 0) {
perror("fork");
VERIFY_NOT_REACHED();
} else if (pid == 0) {
if (pid == 0) {
execl("/bin/mount", "mount", "-a", nullptr);
perror("exec");
VERIFY_NOT_REACHED();
} else {
wait(nullptr);
}
return {};
}
static void create_tmp_coredump_directory()
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
auto rc = mkdir("/tmp/coredump", 0777);
if (rc < 0) {
perror("mkdir(/tmp/coredump)");
VERIFY_NOT_REACHED();
}
TRY(Core::System::mkdir("/tmp/coredump", 0777));
umask(old_umask);
return {};
}
ErrorOr<int> serenity_main(Main::Arguments arguments)
@ -472,15 +423,15 @@ ErrorOr<int> serenity_main(Main::Arguments arguments)
args_parser.parse(arguments);
if (!user) {
mount_all_filesystems();
prepare_synthetic_filesystems();
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) {
create_tmp_coredump_directory();
determine_system_mode();
TRY(create_tmp_coredump_directory());
TRY(determine_system_mode());
}
Core::EventLoop event_loop;