Kernel: Guard Process "protected data" with a spinlock
This ensures that both mutable and immutable access to the protected data of a process is serialized. Note that there may still be multiple TOCTOU issues around this, as we have a bunch of convenience accessors that make it easy to introduce them. We'll need to audit those as well.
This commit is contained in:
Andreas Kling
parent
728c3fbd14
commit
8ed06ad814
Notes:
sideshowbarker
2024-07-18 00:54:03 +09:00
Author: https://github.com/awesomekling Commit: https://github.com/SerenityOS/serenity/commit/8ed06ad814
11 changed files with 348 additions and 300 deletions
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@ -211,14 +211,14 @@ LockRefPtr<Process> Process::create_kernel_process(LockRefPtr<Thread>& first_thr
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void Process::protect_data()
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{
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m_protected_data_refs.unref([&]() {
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MM.set_page_writable_direct(VirtualAddress { &this->m_protected_values }, false);
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MM.set_page_writable_direct(VirtualAddress { &this->m_protected_values_do_not_access_directly }, false);
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});
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}
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void Process::unprotect_data()
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{
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m_protected_data_refs.ref([&]() {
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MM.set_page_writable_direct(VirtualAddress { &this->m_protected_values }, true);
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MM.set_page_writable_direct(VirtualAddress { &this->m_protected_values_do_not_access_directly }, true);
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});
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}
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@ -234,6 +234,7 @@ ErrorOr<NonnullLockRefPtr<Process>> Process::try_create(LockRefPtr<Thread>& firs
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Process::Process(NonnullOwnPtr<KString> name, NonnullRefPtr<Credentials> credentials, ProcessID ppid, bool is_kernel_process, RefPtr<Custody> current_directory, RefPtr<Custody> executable, TTY* tty, UnveilNode unveil_tree)
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: m_name(move(name))
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, m_protected_data_lock(LockRank::None)
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, m_is_kernel_process(is_kernel_process)
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, m_executable(LockRank::None, move(executable))
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, m_current_directory(LockRank::None, move(current_directory))
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@ -242,11 +243,11 @@ Process::Process(NonnullOwnPtr<KString> name, NonnullRefPtr<Credentials> credent
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, m_wait_blocker_set(*this)
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{
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// Ensure that we protect the process data when exiting the constructor.
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ProtectedDataMutationScope scope { *this };
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m_protected_values.pid = allocate_pid();
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m_protected_values.ppid = ppid;
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m_protected_values.credentials = move(credentials);
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with_mutable_protected_data([&](auto& protected_data) {
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protected_data.pid = allocate_pid();
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protected_data.ppid = ppid;
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protected_data.credentials = move(credentials);
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});
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dbgln_if(PROCESS_DEBUG, "Created new process {}({})", m_name, this->pid().value());
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}
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@ -402,10 +403,9 @@ void Process::crash(int signal, FlatPtr ip, bool out_of_memory)
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}
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dump_backtrace();
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}
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{
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ProtectedDataMutationScope scope { *this };
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m_protected_values.termination_signal = signal;
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}
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with_mutable_protected_data([&](auto& protected_data) {
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protected_data.termination_signal = signal;
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});
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set_should_generate_coredump(!out_of_memory);
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address_space().dump_regions();
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VERIFY(is_user_process());
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@ -527,13 +527,15 @@ siginfo_t Process::wait_info() const
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siginfo.si_pid = pid().value();
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siginfo.si_uid = uid().value();
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if (m_protected_values.termination_signal != 0) {
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siginfo.si_status = m_protected_values.termination_signal;
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siginfo.si_code = CLD_KILLED;
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} else {
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siginfo.si_status = m_protected_values.termination_status;
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siginfo.si_code = CLD_EXITED;
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}
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with_protected_data([&](auto& protected_data) {
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if (protected_data.termination_signal != 0) {
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siginfo.si_status = protected_data.termination_signal;
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siginfo.si_code = CLD_KILLED;
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} else {
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siginfo.si_status = protected_data.termination_status;
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siginfo.si_code = CLD_EXITED;
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}
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});
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return siginfo;
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}
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@ -619,7 +621,7 @@ void Process::finalize()
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dbgln("\x1b[01;31mProcess '{}' exited with the veil left open\x1b[0m", name());
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if (g_init_pid != 0 && pid() == g_init_pid)
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PANIC("Init process quit unexpectedly. Exit code: {}", m_protected_values.termination_status);
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PANIC("Init process quit unexpectedly. Exit code: {}", termination_status());
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if (is_dumpable()) {
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if (m_should_generate_coredump) {
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@ -741,11 +743,10 @@ void Process::terminate_due_to_signal(u8 signal)
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VERIFY(signal < NSIG);
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VERIFY(&Process::current() == this);
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dbgln("Terminating {} due to signal {}", *this, signal);
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{
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ProtectedDataMutationScope scope { *this };
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m_protected_values.termination_status = 0;
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m_protected_values.termination_signal = signal;
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}
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with_mutable_protected_data([&](auto& protected_data) {
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protected_data.termination_status = 0;
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protected_data.termination_signal = signal;
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});
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die();
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}
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@ -851,31 +852,34 @@ void Process::delete_perf_events_buffer()
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bool Process::remove_thread(Thread& thread)
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{
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ProtectedDataMutationScope scope { *this };
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auto thread_cnt_before = m_protected_values.thread_count.fetch_sub(1, AK::MemoryOrder::memory_order_acq_rel);
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VERIFY(thread_cnt_before != 0);
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u32 thread_count_before = 0;
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thread_list().with([&](auto& thread_list) {
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thread_list.remove(thread);
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with_mutable_protected_data([&](auto& protected_data) {
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thread_count_before = protected_data.thread_count.fetch_sub(1, AK::MemoryOrder::memory_order_acq_rel);
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VERIFY(thread_count_before != 0);
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});
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});
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return thread_cnt_before == 1;
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return thread_count_before == 1;
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}
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bool Process::add_thread(Thread& thread)
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{
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ProtectedDataMutationScope scope { *this };
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bool is_first = m_protected_values.thread_count.fetch_add(1, AK::MemoryOrder::memory_order_relaxed) == 0;
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bool is_first = false;
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thread_list().with([&](auto& thread_list) {
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thread_list.append(thread);
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with_mutable_protected_data([&](auto& protected_data) {
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is_first = protected_data.thread_count.fetch_add(1, AK::MemoryOrder::memory_order_relaxed) == 0;
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});
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});
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return is_first;
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}
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void Process::set_dumpable(bool dumpable)
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{
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if (dumpable == m_protected_values.dumpable)
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return;
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ProtectedDataMutationScope scope { *this };
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m_protected_values.dumpable = dumpable;
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with_mutable_protected_data([&](auto& protected_data) {
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protected_data.dumpable = dumpable;
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});
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}
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ErrorOr<void> Process::set_coredump_property(NonnullOwnPtr<KString> key, NonnullOwnPtr<KString> value)
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@ -968,7 +972,9 @@ GroupID Process::sgid() const
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NonnullRefPtr<Credentials> Process::credentials() const
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{
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return *m_protected_values.credentials;
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return with_protected_data([&](auto& protected_data) -> NonnullRefPtr<Credentials> {
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return *protected_data.credentials;
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});
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}
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RefPtr<Custody> Process::executable()
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@ -135,20 +135,19 @@ public:
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friend class Thread;
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friend class Coredump;
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// Helper class to temporarily unprotect a process's protected data so you can write to it.
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class ProtectedDataMutationScope {
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public:
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explicit ProtectedDataMutationScope(Process& process)
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: m_process(process)
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{
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m_process.unprotect_data();
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}
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auto with_protected_data(auto&& callback) const
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{
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SpinlockLocker locker(m_protected_data_lock);
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return callback(m_protected_values_do_not_access_directly);
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}
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~ProtectedDataMutationScope() { m_process.protect_data(); }
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private:
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Process& m_process;
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};
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auto with_mutable_protected_data(auto&& callback)
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{
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SpinlockLocker locker(m_protected_data_lock);
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unprotect_data();
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auto guard = ScopeGuard([&] { protect_data(); });
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return callback(m_protected_values_do_not_access_directly);
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}
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enum class State : u8 {
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Running = 0,
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@ -218,12 +217,21 @@ public:
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static SessionID get_sid_from_pgid(ProcessGroupID pgid);
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StringView name() const { return m_name->view(); }
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ProcessID pid() const { return m_protected_values.pid; }
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SessionID sid() const { return m_protected_values.sid; }
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ProcessID pid() const
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{
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return with_protected_data([](auto& protected_data) { return protected_data.pid; });
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}
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SessionID sid() const
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{
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return with_protected_data([](auto& protected_data) { return protected_data.sid; });
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}
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bool is_session_leader() const { return sid().value() == pid().value(); }
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ProcessGroupID pgid() const { return m_pg ? m_pg->pgid() : 0; }
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bool is_group_leader() const { return pgid().value() == pid().value(); }
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ProcessID ppid() const { return m_protected_values.ppid; }
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ProcessID ppid() const
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{
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return with_protected_data([](auto& protected_data) { return protected_data.ppid; });
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}
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NonnullRefPtr<Credentials> credentials() const;
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@ -234,10 +242,16 @@ public:
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UserID suid() const;
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GroupID sgid() const;
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bool is_dumpable() const { return m_protected_values.dumpable; }
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bool is_dumpable() const
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{
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return with_protected_data([](auto& protected_data) { return protected_data.dumpable; });
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}
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void set_dumpable(bool);
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mode_t umask() const { return m_protected_values.umask; }
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mode_t umask() const
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{
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return with_protected_data([](auto& protected_data) { return protected_data.umask; });
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}
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bool in_group(GroupID) const;
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@ -467,19 +481,37 @@ public:
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void terminate_due_to_signal(u8 signal);
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ErrorOr<void> send_signal(u8 signal, Process* sender);
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u8 termination_signal() const { return m_protected_values.termination_signal; }
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u8 termination_status() const { return m_protected_values.termination_status; }
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u8 termination_signal() const
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{
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return with_protected_data([](auto& protected_data) -> u8 {
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return protected_data.termination_signal;
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});
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}
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u8 termination_status() const
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{
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return with_protected_data([](auto& protected_data) { return protected_data.termination_status; });
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}
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u16 thread_count() const
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{
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return m_protected_values.thread_count.load(AK::MemoryOrder::memory_order_relaxed);
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return with_protected_data([](auto& protected_data) {
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return protected_data.thread_count.load(AK::MemoryOrder::memory_order_relaxed);
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});
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}
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Mutex& big_lock() { return m_big_lock; }
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Mutex& ptrace_lock() { return m_ptrace_lock; }
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bool has_promises() const { return m_protected_values.has_promises; }
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bool has_promised(Pledge pledge) const { return (m_protected_values.promises & (1U << (u32)pledge)) != 0; }
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bool has_promises() const
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{
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return with_protected_data([](auto& protected_data) { return protected_data.has_promises.load(); });
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}
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bool has_promised(Pledge pledge) const
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{
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return with_protected_data([&](auto& protected_data) {
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return (protected_data.promises & (1U << (u32)pledge)) != 0;
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});
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}
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VeilState veil_state() const
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{
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@ -539,7 +571,10 @@ public:
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Memory::AddressSpace& address_space() { return *m_space; }
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Memory::AddressSpace const& address_space() const { return *m_space; }
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VirtualAddress signal_trampoline() const { return m_protected_values.signal_trampoline; }
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VirtualAddress signal_trampoline() const
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{
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return with_protected_data([](auto& protected_data) { return protected_data.signal_trampoline; });
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}
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ErrorOr<void> require_promise(Pledge);
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ErrorOr<void> require_no_promises() const;
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@ -635,6 +670,7 @@ private:
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LockRefPtr<ProcessGroup> m_pg;
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RecursiveSpinlock mutable m_protected_data_lock;
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AtomicEdgeAction<u32> m_protected_data_refs;
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void protect_data();
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void unprotect_data();
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@ -870,7 +906,7 @@ private:
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Array<SignalActionData, NSIG> m_signal_action_data;
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static_assert(sizeof(ProtectedValues) < (PAGE_SIZE));
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alignas(4096) ProtectedValues m_protected_values;
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alignas(4096) ProtectedValues m_protected_values_do_not_access_directly;
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u8 m_protected_values_padding[PAGE_SIZE - sizeof(ProtectedValues)];
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public:
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@ -17,8 +17,9 @@ ErrorOr<FlatPtr> Process::sys$disown(ProcessID pid)
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return ESRCH;
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if (process->ppid() != this->pid())
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return ECHILD;
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ProtectedDataMutationScope scope(*process);
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process->m_protected_values.ppid = 0;
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process->with_mutable_protected_data([](auto& protected_data) {
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protected_data.ppid = 0;
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});
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process->disowned_by_waiter(*this);
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return 0;
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}
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@ -542,11 +542,10 @@ ErrorOr<void> Process::do_exec(NonnullLockRefPtr<OpenFileDescription> main_progr
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kill_threads_except_self();
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{
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ProtectedDataMutationScope scope { *this };
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m_protected_values.credentials = move(new_credentials);
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}
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set_dumpable(!executable_is_setid);
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with_mutable_protected_data([&](auto& protected_data) {
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protected_data.credentials = move(new_credentials);
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protected_data.dumpable = !executable_is_setid;
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});
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// We make sure to enter the new address space before destroying the old one.
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// This ensures that the process always has a valid page directory.
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@ -627,19 +626,18 @@ ErrorOr<void> Process::do_exec(NonnullLockRefPtr<OpenFileDescription> main_progr
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// NOTE: Be careful to not trigger any page faults below!
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{
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ProtectedDataMutationScope scope { *this };
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m_protected_values.promises = m_protected_values.execpromises.load();
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m_protected_values.has_promises = m_protected_values.has_execpromises.load();
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with_mutable_protected_data([&](auto& protected_data) {
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protected_data.promises = protected_data.execpromises.load();
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protected_data.has_promises = protected_data.has_execpromises.load();
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m_protected_values.execpromises = 0;
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m_protected_values.has_execpromises = false;
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protected_data.execpromises = 0;
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protected_data.has_execpromises = false;
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m_protected_values.signal_trampoline = signal_trampoline_region->vaddr();
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protected_data.signal_trampoline = signal_trampoline_region->vaddr();
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// FIXME: PID/TID ISSUE
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m_protected_values.pid = new_main_thread->tid().value();
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}
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protected_data.pid = new_main_thread->tid().value();
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});
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auto tsr_result = new_main_thread->make_thread_specific_region({});
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if (tsr_result.is_error()) {
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@ -18,11 +18,10 @@ void Process::sys$exit(int status)
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VERIFY_PROCESS_BIG_LOCK_ACQUIRED(this);
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}
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{
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ProtectedDataMutationScope scope { *this };
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m_protected_values.termination_status = status;
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m_protected_values.termination_signal = 0;
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}
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with_mutable_protected_data([status](auto& protected_data) {
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protected_data.termination_status = status;
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protected_data.termination_signal = 0;
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});
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auto* current_thread = Thread::current();
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current_thread->set_profiling_suppressed();
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@ -49,18 +49,19 @@ ErrorOr<FlatPtr> Process::sys$fork(RegisterState& regs)
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child->m_pg = m_pg;
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{
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ProtectedDataMutationScope scope { *child };
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child->m_protected_values.promises = m_protected_values.promises.load();
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child->m_protected_values.execpromises = m_protected_values.execpromises.load();
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child->m_protected_values.has_promises = m_protected_values.has_promises.load();
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child->m_protected_values.has_execpromises = m_protected_values.has_execpromises.load();
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child->m_protected_values.sid = m_protected_values.sid;
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child->m_protected_values.credentials = m_protected_values.credentials;
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child->m_protected_values.umask = m_protected_values.umask;
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child->m_protected_values.signal_trampoline = m_protected_values.signal_trampoline;
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child->m_protected_values.dumpable = m_protected_values.dumpable;
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}
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with_protected_data([&](auto& my_protected_data) {
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child->with_mutable_protected_data([&](auto& child_protected_data) {
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child_protected_data.promises = my_protected_data.promises.load();
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child_protected_data.execpromises = my_protected_data.execpromises.load();
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child_protected_data.has_promises = my_protected_data.has_promises.load();
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child_protected_data.has_execpromises = my_protected_data.has_execpromises.load();
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child_protected_data.sid = my_protected_data.sid;
|
||||
child_protected_data.credentials = my_protected_data.credentials;
|
||||
child_protected_data.umask = my_protected_data.umask;
|
||||
child_protected_data.signal_trampoline = my_protected_data.signal_trampoline;
|
||||
child_protected_data.dumpable = my_protected_data.dumpable;
|
||||
});
|
||||
});
|
||||
|
||||
dbgln_if(FORK_DEBUG, "fork: child={}", child);
|
||||
child->address_space().set_enforces_syscall_regions(address_space().enforces_syscall_regions());
|
||||
|
|
|
|||
|
|
@ -46,43 +46,48 @@ ErrorOr<FlatPtr> Process::sys$pledge(Userspace<Syscall::SC_pledge_params const*>
|
|||
if (promises) {
|
||||
if (!parse_pledge(promises->view(), new_promises))
|
||||
return EINVAL;
|
||||
|
||||
if (m_protected_values.has_promises && (new_promises & ~m_protected_values.promises)) {
|
||||
if (!(m_protected_values.promises & (1u << (u32)Pledge::no_error)))
|
||||
return EPERM;
|
||||
new_promises &= m_protected_values.promises;
|
||||
}
|
||||
}
|
||||
|
||||
u32 new_execpromises = 0;
|
||||
if (execpromises) {
|
||||
if (!parse_pledge(execpromises->view(), new_execpromises))
|
||||
return EINVAL;
|
||||
if (m_protected_values.has_execpromises && (new_execpromises & ~m_protected_values.execpromises)) {
|
||||
if (!(m_protected_values.promises & (1u << (u32)Pledge::no_error)))
|
||||
return EPERM;
|
||||
new_execpromises &= m_protected_values.execpromises;
|
||||
}
|
||||
|
||||
return with_mutable_protected_data([&](auto& protected_data) -> ErrorOr<FlatPtr> {
|
||||
if (promises) {
|
||||
if (protected_data.has_promises && (new_promises & ~protected_data.promises)) {
|
||||
if (!(protected_data.promises & (1u << (u32)Pledge::no_error)))
|
||||
return EPERM;
|
||||
new_promises &= protected_data.promises;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
// Only apply promises after all validation has occurred, this ensures
|
||||
// we don't introduce logic bugs like applying the promises, and then
|
||||
// erroring out when parsing the exec promises later. Such bugs silently
|
||||
// leave the caller in an unexpected state.
|
||||
if (execpromises) {
|
||||
if (protected_data.has_execpromises && (new_execpromises & ~protected_data.execpromises)) {
|
||||
if (!(protected_data.promises & (1u << (u32)Pledge::no_error)))
|
||||
return EPERM;
|
||||
new_execpromises &= protected_data.execpromises;
|
||||
}
|
||||
}
|
||||
|
||||
ProtectedDataMutationScope scope { *this };
|
||||
// Only apply promises after all validation has occurred, this ensures
|
||||
// we don't introduce logic bugs like applying the promises, and then
|
||||
// erroring out when parsing the exec promises later. Such bugs silently
|
||||
// leave the caller in an unexpected state.
|
||||
|
||||
if (promises) {
|
||||
m_protected_values.has_promises = true;
|
||||
m_protected_values.promises = new_promises;
|
||||
}
|
||||
if (promises) {
|
||||
protected_data.has_promises = true;
|
||||
protected_data.promises = new_promises;
|
||||
}
|
||||
|
||||
if (execpromises) {
|
||||
m_protected_values.has_execpromises = true;
|
||||
m_protected_values.execpromises = new_execpromises;
|
||||
}
|
||||
if (execpromises) {
|
||||
protected_data.has_execpromises = true;
|
||||
protected_data.execpromises = new_execpromises;
|
||||
}
|
||||
|
||||
return 0;
|
||||
return 0;
|
||||
});
|
||||
}
|
||||
|
||||
}
|
||||
|
|
|
|||
|
|
@ -20,7 +20,7 @@ ErrorOr<FlatPtr> Process::sys$getppid()
|
|||
{
|
||||
VERIFY_PROCESS_BIG_LOCK_ACQUIRED(this);
|
||||
TRY(require_promise(Pledge::stdio));
|
||||
return m_protected_values.ppid.value();
|
||||
return with_protected_data([](auto& protected_data) { return protected_data.ppid.value(); });
|
||||
}
|
||||
|
||||
ErrorOr<FlatPtr> Process::sys$get_process_name(Userspace<char*> buffer, size_t buffer_size)
|
||||
|
|
|
|||
|
|
@ -40,9 +40,10 @@ ErrorOr<FlatPtr> Process::sys$setsid()
|
|||
|
||||
m_pg = TRY(ProcessGroup::try_create(ProcessGroupID(pid().value())));
|
||||
m_tty = nullptr;
|
||||
ProtectedDataMutationScope scope { *this };
|
||||
m_protected_values.sid = pid().value();
|
||||
return sid().value();
|
||||
return with_mutable_protected_data([&](auto& protected_data) -> ErrorOr<FlatPtr> {
|
||||
protected_data.sid = pid().value();
|
||||
return protected_data.sid.value();
|
||||
});
|
||||
}
|
||||
|
||||
ErrorOr<FlatPtr> Process::sys$getpgid(pid_t pid)
|
||||
|
|
|
|||
|
|
@ -17,27 +17,27 @@ ErrorOr<FlatPtr> Process::sys$seteuid(UserID new_euid)
|
|||
if (new_euid == (uid_t)-1)
|
||||
return EINVAL;
|
||||
|
||||
auto credentials = this->credentials();
|
||||
return with_mutable_protected_data([&](auto& protected_data) -> ErrorOr<FlatPtr> {
|
||||
auto credentials = this->credentials();
|
||||
|
||||
if (new_euid != credentials->uid() && new_euid != credentials->suid() && !credentials->is_superuser())
|
||||
return EPERM;
|
||||
if (new_euid != credentials->uid() && new_euid != credentials->suid() && !credentials->is_superuser())
|
||||
return EPERM;
|
||||
|
||||
auto new_credentials = TRY(Credentials::create(
|
||||
credentials->uid(),
|
||||
credentials->gid(),
|
||||
new_euid,
|
||||
credentials->egid(),
|
||||
credentials->suid(),
|
||||
credentials->sgid(),
|
||||
credentials->extra_gids()));
|
||||
auto new_credentials = TRY(Credentials::create(
|
||||
credentials->uid(),
|
||||
credentials->gid(),
|
||||
new_euid,
|
||||
credentials->egid(),
|
||||
credentials->suid(),
|
||||
credentials->sgid(),
|
||||
credentials->extra_gids()));
|
||||
|
||||
ProtectedDataMutationScope scope { *this };
|
||||
if (credentials->euid() != new_euid)
|
||||
protected_data.dumpable = false;
|
||||
|
||||
if (credentials->euid() != new_euid)
|
||||
set_dumpable(false);
|
||||
|
||||
m_protected_values.credentials = move(new_credentials);
|
||||
return 0;
|
||||
protected_data.credentials = move(new_credentials);
|
||||
return 0;
|
||||
});
|
||||
}
|
||||
|
||||
ErrorOr<FlatPtr> Process::sys$setegid(GroupID new_egid)
|
||||
|
|
@ -48,27 +48,27 @@ ErrorOr<FlatPtr> Process::sys$setegid(GroupID new_egid)
|
|||
if (new_egid == (uid_t)-1)
|
||||
return EINVAL;
|
||||
|
||||
auto credentials = this->credentials();
|
||||
return with_mutable_protected_data([&](auto& protected_data) -> ErrorOr<FlatPtr> {
|
||||
auto credentials = this->credentials();
|
||||
|
||||
if (new_egid != credentials->gid() && new_egid != credentials->sgid() && !credentials->is_superuser())
|
||||
return EPERM;
|
||||
if (new_egid != credentials->gid() && new_egid != credentials->sgid() && !credentials->is_superuser())
|
||||
return EPERM;
|
||||
|
||||
auto new_credentials = TRY(Credentials::create(
|
||||
credentials->uid(),
|
||||
credentials->gid(),
|
||||
credentials->euid(),
|
||||
new_egid,
|
||||
credentials->suid(),
|
||||
credentials->sgid(),
|
||||
credentials->extra_gids()));
|
||||
auto new_credentials = TRY(Credentials::create(
|
||||
credentials->uid(),
|
||||
credentials->gid(),
|
||||
credentials->euid(),
|
||||
new_egid,
|
||||
credentials->suid(),
|
||||
credentials->sgid(),
|
||||
credentials->extra_gids()));
|
||||
|
||||
ProtectedDataMutationScope scope { *this };
|
||||
if (credentials->egid() != new_egid)
|
||||
protected_data.dumpable = false;
|
||||
|
||||
if (credentials->egid() != new_egid)
|
||||
set_dumpable(false);
|
||||
|
||||
m_protected_values.credentials = move(new_credentials);
|
||||
return 0;
|
||||
protected_data.credentials = move(new_credentials);
|
||||
return 0;
|
||||
});
|
||||
}
|
||||
|
||||
ErrorOr<FlatPtr> Process::sys$setuid(UserID new_uid)
|
||||
|
|
@ -79,27 +79,27 @@ ErrorOr<FlatPtr> Process::sys$setuid(UserID new_uid)
|
|||
if (new_uid == (uid_t)-1)
|
||||
return EINVAL;
|
||||
|
||||
auto credentials = this->credentials();
|
||||
return with_mutable_protected_data([&](auto& protected_data) -> ErrorOr<FlatPtr> {
|
||||
auto credentials = this->credentials();
|
||||
|
||||
if (new_uid != credentials->uid() && new_uid != credentials->euid() && !credentials->is_superuser())
|
||||
return EPERM;
|
||||
if (new_uid != credentials->uid() && new_uid != credentials->euid() && !credentials->is_superuser())
|
||||
return EPERM;
|
||||
|
||||
auto new_credentials = TRY(Credentials::create(
|
||||
new_uid,
|
||||
credentials->gid(),
|
||||
new_uid,
|
||||
credentials->egid(),
|
||||
new_uid,
|
||||
credentials->sgid(),
|
||||
credentials->extra_gids()));
|
||||
auto new_credentials = TRY(Credentials::create(
|
||||
new_uid,
|
||||
credentials->gid(),
|
||||
new_uid,
|
||||
credentials->egid(),
|
||||
new_uid,
|
||||
credentials->sgid(),
|
||||
credentials->extra_gids()));
|
||||
|
||||
ProtectedDataMutationScope scope { *this };
|
||||
if (credentials->euid() != new_uid)
|
||||
protected_data.dumpable = false;
|
||||
|
||||
if (credentials->euid() != new_uid)
|
||||
set_dumpable(false);
|
||||
|
||||
m_protected_values.credentials = move(new_credentials);
|
||||
return 0;
|
||||
protected_data.credentials = move(new_credentials);
|
||||
return 0;
|
||||
});
|
||||
}
|
||||
|
||||
ErrorOr<FlatPtr> Process::sys$setgid(GroupID new_gid)
|
||||
|
|
@ -110,27 +110,27 @@ ErrorOr<FlatPtr> Process::sys$setgid(GroupID new_gid)
|
|||
if (new_gid == (uid_t)-1)
|
||||
return EINVAL;
|
||||
|
||||
auto credentials = this->credentials();
|
||||
return with_mutable_protected_data([&](auto& protected_data) -> ErrorOr<FlatPtr> {
|
||||
auto credentials = this->credentials();
|
||||
|
||||
if (new_gid != credentials->gid() && new_gid != credentials->egid() && !credentials->is_superuser())
|
||||
return EPERM;
|
||||
if (new_gid != credentials->gid() && new_gid != credentials->egid() && !credentials->is_superuser())
|
||||
return EPERM;
|
||||
|
||||
auto new_credentials = TRY(Credentials::create(
|
||||
credentials->uid(),
|
||||
new_gid,
|
||||
credentials->euid(),
|
||||
new_gid,
|
||||
credentials->suid(),
|
||||
new_gid,
|
||||
credentials->extra_gids()));
|
||||
auto new_credentials = TRY(Credentials::create(
|
||||
credentials->uid(),
|
||||
new_gid,
|
||||
credentials->euid(),
|
||||
new_gid,
|
||||
credentials->suid(),
|
||||
new_gid,
|
||||
credentials->extra_gids()));
|
||||
|
||||
ProtectedDataMutationScope scope { *this };
|
||||
if (credentials->egid() != new_gid)
|
||||
protected_data.dumpable = false;
|
||||
|
||||
if (credentials->egid() != new_gid)
|
||||
set_dumpable(false);
|
||||
|
||||
m_protected_values.credentials = move(new_credentials);
|
||||
return 0;
|
||||
protected_data.credentials = move(new_credentials);
|
||||
return 0;
|
||||
});
|
||||
}
|
||||
|
||||
ErrorOr<FlatPtr> Process::sys$setreuid(UserID new_ruid, UserID new_euid)
|
||||
|
|
@ -138,36 +138,36 @@ ErrorOr<FlatPtr> Process::sys$setreuid(UserID new_ruid, UserID new_euid)
|
|||
VERIFY_NO_PROCESS_BIG_LOCK(this);
|
||||
TRY(require_promise(Pledge::id));
|
||||
|
||||
auto credentials = this->credentials();
|
||||
return with_mutable_protected_data([&](auto& protected_data) -> ErrorOr<FlatPtr> {
|
||||
auto credentials = this->credentials();
|
||||
|
||||
if (new_ruid == (uid_t)-1)
|
||||
new_ruid = credentials->uid();
|
||||
if (new_euid == (uid_t)-1)
|
||||
new_euid = credentials->euid();
|
||||
if (new_ruid == (uid_t)-1)
|
||||
new_ruid = credentials->uid();
|
||||
if (new_euid == (uid_t)-1)
|
||||
new_euid = credentials->euid();
|
||||
|
||||
auto ok = [&credentials](UserID id) { return id == credentials->uid() || id == credentials->euid() || id == credentials->suid(); };
|
||||
if (!ok(new_ruid) || !ok(new_euid))
|
||||
return EPERM;
|
||||
auto ok = [&credentials](UserID id) { return id == credentials->uid() || id == credentials->euid() || id == credentials->suid(); };
|
||||
if (!ok(new_ruid) || !ok(new_euid))
|
||||
return EPERM;
|
||||
|
||||
if (new_ruid < (uid_t)-1 || new_euid < (uid_t)-1)
|
||||
return EINVAL;
|
||||
if (new_ruid < (uid_t)-1 || new_euid < (uid_t)-1)
|
||||
return EINVAL;
|
||||
|
||||
auto new_credentials = TRY(Credentials::create(
|
||||
new_ruid,
|
||||
credentials->gid(),
|
||||
new_euid,
|
||||
credentials->egid(),
|
||||
credentials->suid(),
|
||||
credentials->sgid(),
|
||||
credentials->extra_gids()));
|
||||
auto new_credentials = TRY(Credentials::create(
|
||||
new_ruid,
|
||||
credentials->gid(),
|
||||
new_euid,
|
||||
credentials->egid(),
|
||||
credentials->suid(),
|
||||
credentials->sgid(),
|
||||
credentials->extra_gids()));
|
||||
|
||||
ProtectedDataMutationScope scope { *this };
|
||||
if (credentials->euid() != new_euid)
|
||||
protected_data.dumpable = false;
|
||||
|
||||
if (credentials->euid() != new_euid)
|
||||
set_dumpable(false);
|
||||
|
||||
m_protected_values.credentials = move(new_credentials);
|
||||
return 0;
|
||||
protected_data.credentials = move(new_credentials);
|
||||
return 0;
|
||||
});
|
||||
}
|
||||
|
||||
ErrorOr<FlatPtr> Process::sys$setresuid(UserID new_ruid, UserID new_euid, UserID new_suid)
|
||||
|
|
@ -175,35 +175,35 @@ ErrorOr<FlatPtr> Process::sys$setresuid(UserID new_ruid, UserID new_euid, UserID
|
|||
VERIFY_NO_PROCESS_BIG_LOCK(this);
|
||||
TRY(require_promise(Pledge::id));
|
||||
|
||||
auto credentials = this->credentials();
|
||||
return with_mutable_protected_data([&](auto& protected_data) -> ErrorOr<FlatPtr> {
|
||||
auto credentials = this->credentials();
|
||||
|
||||
if (new_ruid == (uid_t)-1)
|
||||
new_ruid = credentials->uid();
|
||||
if (new_euid == (uid_t)-1)
|
||||
new_euid = credentials->euid();
|
||||
if (new_suid == (uid_t)-1)
|
||||
new_suid = credentials->suid();
|
||||
if (new_ruid == (uid_t)-1)
|
||||
new_ruid = credentials->uid();
|
||||
if (new_euid == (uid_t)-1)
|
||||
new_euid = credentials->euid();
|
||||
if (new_suid == (uid_t)-1)
|
||||
new_suid = credentials->suid();
|
||||
|
||||
auto ok = [&credentials](UserID id) { return id == credentials->uid() || id == credentials->euid() || id == credentials->suid(); };
|
||||
if ((!ok(new_ruid) || !ok(new_euid) || !ok(new_suid)) && !credentials->is_superuser())
|
||||
return EPERM;
|
||||
auto ok = [&credentials](UserID id) { return id == credentials->uid() || id == credentials->euid() || id == credentials->suid(); };
|
||||
if ((!ok(new_ruid) || !ok(new_euid) || !ok(new_suid)) && !credentials->is_superuser())
|
||||
return EPERM;
|
||||
|
||||
auto new_credentials = TRY(Credentials::create(
|
||||
new_ruid,
|
||||
credentials->gid(),
|
||||
new_euid,
|
||||
credentials->egid(),
|
||||
new_suid,
|
||||
credentials->sgid(),
|
||||
credentials->extra_gids()));
|
||||
auto new_credentials = TRY(Credentials::create(
|
||||
new_ruid,
|
||||
credentials->gid(),
|
||||
new_euid,
|
||||
credentials->egid(),
|
||||
new_suid,
|
||||
credentials->sgid(),
|
||||
credentials->extra_gids()));
|
||||
|
||||
ProtectedDataMutationScope scope { *this };
|
||||
if (credentials->euid() != new_euid)
|
||||
protected_data.dumpable = false;
|
||||
|
||||
if (credentials->euid() != new_euid)
|
||||
set_dumpable(false);
|
||||
|
||||
m_protected_values.credentials = move(new_credentials);
|
||||
return 0;
|
||||
protected_data.credentials = move(new_credentials);
|
||||
return 0;
|
||||
});
|
||||
}
|
||||
|
||||
ErrorOr<FlatPtr> Process::sys$setresgid(GroupID new_rgid, GroupID new_egid, GroupID new_sgid)
|
||||
|
|
@ -211,35 +211,35 @@ ErrorOr<FlatPtr> Process::sys$setresgid(GroupID new_rgid, GroupID new_egid, Grou
|
|||
VERIFY_NO_PROCESS_BIG_LOCK(this);
|
||||
TRY(require_promise(Pledge::id));
|
||||
|
||||
auto credentials = this->credentials();
|
||||
return with_mutable_protected_data([&](auto& protected_data) -> ErrorOr<FlatPtr> {
|
||||
auto credentials = this->credentials();
|
||||
|
||||
if (new_rgid == (gid_t)-1)
|
||||
new_rgid = credentials->gid();
|
||||
if (new_egid == (gid_t)-1)
|
||||
new_egid = credentials->egid();
|
||||
if (new_sgid == (gid_t)-1)
|
||||
new_sgid = credentials->sgid();
|
||||
if (new_rgid == (gid_t)-1)
|
||||
new_rgid = credentials->gid();
|
||||
if (new_egid == (gid_t)-1)
|
||||
new_egid = credentials->egid();
|
||||
if (new_sgid == (gid_t)-1)
|
||||
new_sgid = credentials->sgid();
|
||||
|
||||
auto ok = [&credentials](GroupID id) { return id == credentials->gid() || id == credentials->egid() || id == credentials->sgid(); };
|
||||
if ((!ok(new_rgid) || !ok(new_egid) || !ok(new_sgid)) && !credentials->is_superuser())
|
||||
return EPERM;
|
||||
auto ok = [&credentials](GroupID id) { return id == credentials->gid() || id == credentials->egid() || id == credentials->sgid(); };
|
||||
if ((!ok(new_rgid) || !ok(new_egid) || !ok(new_sgid)) && !credentials->is_superuser())
|
||||
return EPERM;
|
||||
|
||||
auto new_credentials = TRY(Credentials::create(
|
||||
credentials->uid(),
|
||||
new_rgid,
|
||||
credentials->euid(),
|
||||
new_egid,
|
||||
credentials->suid(),
|
||||
new_sgid,
|
||||
credentials->extra_gids()));
|
||||
auto new_credentials = TRY(Credentials::create(
|
||||
credentials->uid(),
|
||||
new_rgid,
|
||||
credentials->euid(),
|
||||
new_egid,
|
||||
credentials->suid(),
|
||||
new_sgid,
|
||||
credentials->extra_gids()));
|
||||
|
||||
ProtectedDataMutationScope scope { *this };
|
||||
if (credentials->egid() != new_egid)
|
||||
protected_data.dumpable = false;
|
||||
|
||||
if (credentials->egid() != new_egid)
|
||||
set_dumpable(false);
|
||||
|
||||
m_protected_values.credentials = move(new_credentials);
|
||||
return 0;
|
||||
protected_data.credentials = move(new_credentials);
|
||||
return 0;
|
||||
});
|
||||
}
|
||||
|
||||
ErrorOr<FlatPtr> Process::sys$setgroups(size_t count, Userspace<GroupID const*> user_gids)
|
||||
|
|
@ -250,49 +250,49 @@ ErrorOr<FlatPtr> Process::sys$setgroups(size_t count, Userspace<GroupID const*>
|
|||
if (count > NGROUPS_MAX)
|
||||
return EINVAL;
|
||||
|
||||
auto credentials = this->credentials();
|
||||
return with_mutable_protected_data([&](auto& protected_data) -> ErrorOr<FlatPtr> {
|
||||
auto credentials = this->credentials();
|
||||
|
||||
if (!credentials->is_superuser())
|
||||
return EPERM;
|
||||
if (!credentials->is_superuser())
|
||||
return EPERM;
|
||||
|
||||
if (!count) {
|
||||
ProtectedDataMutationScope scope { *this };
|
||||
m_protected_values.credentials = TRY(Credentials::create(
|
||||
if (!count) {
|
||||
protected_data.credentials = TRY(Credentials::create(
|
||||
credentials->uid(),
|
||||
credentials->gid(),
|
||||
credentials->euid(),
|
||||
credentials->egid(),
|
||||
credentials->suid(),
|
||||
credentials->sgid(),
|
||||
{}));
|
||||
return 0;
|
||||
}
|
||||
|
||||
Vector<GroupID> new_extra_gids;
|
||||
TRY(new_extra_gids.try_resize(count));
|
||||
TRY(copy_n_from_user(new_extra_gids.data(), user_gids, count));
|
||||
|
||||
HashTable<GroupID> unique_extra_gids;
|
||||
for (auto& extra_gid : new_extra_gids) {
|
||||
if (extra_gid != credentials->gid())
|
||||
TRY(unique_extra_gids.try_set(extra_gid));
|
||||
}
|
||||
|
||||
new_extra_gids.clear_with_capacity();
|
||||
for (auto extra_gid : unique_extra_gids) {
|
||||
TRY(new_extra_gids.try_append(extra_gid));
|
||||
}
|
||||
|
||||
protected_data.credentials = TRY(Credentials::create(
|
||||
credentials->uid(),
|
||||
credentials->gid(),
|
||||
credentials->euid(),
|
||||
credentials->egid(),
|
||||
credentials->suid(),
|
||||
credentials->sgid(),
|
||||
{}));
|
||||
new_extra_gids.span()));
|
||||
return 0;
|
||||
}
|
||||
|
||||
Vector<GroupID> new_extra_gids;
|
||||
TRY(new_extra_gids.try_resize(count));
|
||||
TRY(copy_n_from_user(new_extra_gids.data(), user_gids, count));
|
||||
|
||||
HashTable<GroupID> unique_extra_gids;
|
||||
for (auto& extra_gid : new_extra_gids) {
|
||||
if (extra_gid != credentials->gid())
|
||||
TRY(unique_extra_gids.try_set(extra_gid));
|
||||
}
|
||||
|
||||
new_extra_gids.clear_with_capacity();
|
||||
for (auto extra_gid : unique_extra_gids) {
|
||||
TRY(new_extra_gids.try_append(extra_gid));
|
||||
}
|
||||
|
||||
ProtectedDataMutationScope scope { *this };
|
||||
m_protected_values.credentials = TRY(Credentials::create(
|
||||
credentials->uid(),
|
||||
credentials->gid(),
|
||||
credentials->euid(),
|
||||
credentials->egid(),
|
||||
credentials->suid(),
|
||||
credentials->sgid(),
|
||||
new_extra_gids.span()));
|
||||
return 0;
|
||||
});
|
||||
}
|
||||
|
||||
}
|
||||
|
|
|
|||
|
|
@ -12,10 +12,11 @@ ErrorOr<FlatPtr> Process::sys$umask(mode_t mask)
|
|||
{
|
||||
VERIFY_PROCESS_BIG_LOCK_ACQUIRED(this);
|
||||
TRY(require_promise(Pledge::stdio));
|
||||
auto old_mask = m_protected_values.umask;
|
||||
ProtectedDataMutationScope scope { *this };
|
||||
m_protected_values.umask = mask & 0777;
|
||||
return old_mask;
|
||||
return with_mutable_protected_data([&](auto& protected_data) -> ErrorOr<FlatPtr> {
|
||||
auto old_mask = protected_data.umask;
|
||||
protected_data.umask = mask & 0777;
|
||||
return old_mask;
|
||||
});
|
||||
}
|
||||
|
||||
}
|
||||
|
|
|
|||
Loading…
Add table
Reference in a new issue