From 3e25ab6ae4574dbae25b080fe66dd7b1d5b95acb Mon Sep 17 00:00:00 2001
From: Josh Holtrop <jholtrop@gmail.com>
Date: Fri, 18 Mar 2022 21:21:00 -0400
Subject: [PATCH] HELLO: Zero out page tables after allocating, before using

---
 src/hello/hello.d | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/src/hello/hello.d b/src/hello/hello.d
index e8d68f3..cd389ac 100644
--- a/src/hello/hello.d
+++ b/src/hello/hello.d
@@ -4,6 +4,7 @@ import scratch;
 import hulk.bootinfo;
 import hos.page_table;
 import hos.cpu;
+import hos.memory;
 
 __gshared EFI_SYSTEM_TABLE * st;
 __gshared BootInfo bootinfo;
@@ -124,7 +125,9 @@ private bool get_memory_map()
 
 private PageTableEntry * new_page_table()
 {
-    return cast(PageTableEntry *)scratch_alloc(1u);
+    PageTableEntry * pt = cast(PageTableEntry *)scratch_alloc(1u);
+    memset64(pt, 0u, 512);
+    return pt;
 }
 
 private void map(ulong source_page, ulong dest_page, PageTableEntry * pt_base)