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Kernel: Make sure we can allocate kernel stack before creating thread
Wrap thread creation in a Thread::try_create() helper that first allocates a kernel stack region. If that allocation fails, we propagate an ENOMEM error to the caller. This avoids the situation where a thread is half-constructed, without a valid kernel stack, and avoids having to do messy cleanup in that case.
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parent
5c45b0d32d
commit
b466ede1ea
Notes:
sideshowbarker
2024-07-18 22:32:06 +09:00
Author: https://github.com/awesomekling Commit: https://github.com/SerenityOS/serenity/commit/b466ede1eab
@ -346,14 +346,11 @@ Process::Process(RefPtr<Thread>& first_thread, const String& name, uid_t uid, gi
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first_thread = Thread::current()->clone(*this);
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} else {
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// NOTE: This non-forked code path is only taken when the kernel creates a process "manually" (at boot.)
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first_thread = adopt(*new Thread(*this));
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auto thread_or_error = Thread::try_create(*this);
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ASSERT(!thread_or_error.is_error());
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first_thread = thread_or_error.release_value();
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first_thread->detach();
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}
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if (first_thread && !first_thread->was_created()) {
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// We couldn't entirely create or clone this thread, abort
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first_thread = nullptr;
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}
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}
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Process::~Process()
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@ -810,12 +807,11 @@ RefPtr<Thread> Process::create_kernel_thread(void (*entry)(void*), void* entry_d
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// FIXME: Do something with guard pages?
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auto thread = adopt(*new Thread(*this));
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if (!thread->was_created()) {
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// Could not fully create this thread
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auto thread_or_error = Thread::try_create(*this);
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if (thread_or_error.is_error())
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return {};
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}
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auto& thread = thread_or_error.value();
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thread->set_name(name);
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thread->set_affinity(affinity);
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thread->set_priority(priority);
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@ -60,11 +60,11 @@ int Process::sys$create_thread(void* (*entry)(void*), Userspace<const Syscall::S
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// FIXME: Do something with guard pages?
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auto thread = adopt(*new Thread(*this));
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if (!thread->was_created()) {
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// Could not fully create a thread
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return -ENOMEM;
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}
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auto thread_or_error = Thread::try_create(*this);
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if (thread_or_error.is_error())
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return thread_or_error.error();
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auto& thread = thread_or_error.value();
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// We know this thread is not the main_thread,
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// So give it a unique name until the user calls $set_thread_name on it
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@ -53,20 +53,29 @@ void Thread::initialize()
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g_tid_map = new HashMap<ThreadID, Thread*>();
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}
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Thread::Thread(NonnullRefPtr<Process> process)
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KResultOr<NonnullRefPtr<Thread>> Thread::try_create(NonnullRefPtr<Process> process)
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{
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auto kernel_stack_region = MM.allocate_kernel_region(default_kernel_stack_size, {}, Region::Access::Read | Region::Access::Write, false, AllocationStrategy::AllocateNow);
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if (!kernel_stack_region)
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return ENOMEM;
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return adopt(*new Thread(move(process), kernel_stack_region.release_nonnull()));
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}
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Thread::Thread(NonnullRefPtr<Process> process, NonnullOwnPtr<Region> kernel_stack_region)
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: m_process(move(process))
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, m_kernel_stack_region(move(kernel_stack_region))
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, m_name(m_process->name())
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{
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bool is_first_thread = m_process->add_thread(*this);
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ArmedScopeGuard guard([&]() {
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drop_thread_count(is_first_thread);
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});
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if (is_first_thread) {
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// First thread gets TID == PID
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m_tid = m_process->pid().value();
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} else {
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m_tid = Process::allocate_pid().value();
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}
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m_kernel_stack_region->set_name(String::formatted("Kernel stack (thread {})", m_tid.value()));
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{
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ScopedSpinLock lock(g_tid_map_lock);
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auto result = g_tid_map->set(m_tid, this);
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@ -126,7 +135,6 @@ Thread::Thread(NonnullRefPtr<Process> process)
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// The finalizer is responsible for dropping this reference once this
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// thread is ready to be cleaned up.
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ref();
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guard.disarm();
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}
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Thread::~Thread()
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@ -881,11 +889,10 @@ RegisterState& Thread::get_register_dump_from_stack()
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RefPtr<Thread> Thread::clone(Process& process)
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{
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auto clone = adopt(*new Thread(process));
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if (!clone->was_created()) {
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// We failed to clone this thread
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auto thread_or_error = Thread::try_create(process);
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if (thread_or_error.is_error())
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return {};
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}
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auto& clone = thread_or_error.value();
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memcpy(clone->m_signal_action_data, m_signal_action_data, sizeof(m_signal_action_data));
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clone->m_signal_mask = m_signal_mask;
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memcpy(clone->m_fpu_state, m_fpu_state, sizeof(FPUState));
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@ -99,7 +99,7 @@ public:
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static void initialize();
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explicit Thread(NonnullRefPtr<Process>);
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static KResultOr<NonnullRefPtr<Thread>> try_create(NonnullRefPtr<Process>);
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~Thread();
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static RefPtr<Thread> from_tid(ThreadID);
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@ -1157,15 +1157,15 @@ public:
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}
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#endif
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bool was_created() const
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bool is_handling_page_fault() const
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{
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return m_kernel_stack_region;
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return m_handling_page_fault;
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}
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bool is_handling_page_fault() const { return m_handling_page_fault; }
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void set_handling_page_fault(bool b) { m_handling_page_fault = b; }
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private:
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Thread(NonnullRefPtr<Process>, NonnullOwnPtr<Region> kernel_stack_region);
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IntrusiveListNode m_process_thread_list_node;
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int m_runnable_priority { -1 };
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