From 1a801e5737fa8851a367040d67267c53ba01c82c Mon Sep 17 00:00:00 2001
From: Andreas Kling <awesomekling@gmail.com>
Date: Thu, 18 Oct 2018 00:12:52 +0200
Subject: [PATCH] Hang if we GPF in ring 0.

---
 Kernel/Task.h   | 2 ++
 Kernel/i386.cpp | 5 +++++
 2 files changed, 7 insertions(+)

diff --git a/Kernel/Task.h b/Kernel/Task.h
index 21fad1857f7..7b39f85f8d6 100644
--- a/Kernel/Task.h
+++ b/Kernel/Task.h
@@ -37,6 +37,8 @@ public:
         Ring3 = 3,
     };
 
+    bool isRing0() const { return m_ring == Ring0; }
+
     static Task* fromPID(pid_t);
     static Task* fromIPCHandle(IPC::Handle);
     static Task* kernelTask();
diff --git a/Kernel/i386.cpp b/Kernel/i386.cpp
index 47f156772a6..6e7368fab08 100644
--- a/Kernel/i386.cpp
+++ b/Kernel/i386.cpp
@@ -79,6 +79,11 @@ void exception_13_handler()
     kprintf("eax=%x ebx=%x ecx=%x edx=%x\n", regs.eax, regs.ebx, regs.ecx, regs.edx);
     kprintf("ebp=%x esp=%x esi=%x edi=%x\n", regs.ebp, regs.esp, regs.esi, regs.edi);
 
+    if (current->isRing0()) {
+        kprintf("Oh shit, we've crashed in ring 0 :(\n");
+        HANG;
+    }
+
     current->setState(Task::Crashing);
     if (!scheduleNewTask()) {
         kprintf("Failed to schedule a new task :(\n");