From e349f0ad3d361b44c202df69a56dc842e69f1efc Mon Sep 17 00:00:00 2001
From: pjht <terppa05@gmail.com>
Date: Wed, 28 Aug 2019 20:24:53 -0500
Subject: [PATCH] Add protection againt sending to mailbox 0

---
 kernel/cpu/i386/mailboxes.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/kernel/cpu/i386/mailboxes.c b/kernel/cpu/i386/mailboxes.c
index 8d74af3..a3fe551 100644
--- a/kernel/cpu/i386/mailboxes.c
+++ b/kernel/cpu/i386/mailboxes.c
@@ -28,6 +28,10 @@ void kernel_mailbox_free(uint32_t box) {
 }
 
 void kernel_mailbox_send_msg(Message* user_msg) {
+  if (user_msg->to==0) {
+    serial_printf("Box %d attempted to send to box 0!\n",user_msg->from);
+    return;
+  }
   Mailbox mailbox=mailboxes[user_msg->to];
   char* msg_data=kmalloc(user_msg->size);
   memcpy(msg_data,user_msg->msg,user_msg->size);