From 3ac80a2e3d513c2ea9c1cf35a3e16b6f29a19817 Mon Sep 17 00:00:00 2001
From: Erin <erin@erindesu.cz>
Date: Wed, 9 Aug 2023 02:57:25 +0200
Subject: [PATCH] Forbid store

---
 hbvm/src/softpaging/mod.rs | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/hbvm/src/softpaging/mod.rs b/hbvm/src/softpaging/mod.rs
index 3db6248..bf35ff1 100644
--- a/hbvm/src/softpaging/mod.rs
+++ b/hbvm/src/softpaging/mod.rs
@@ -98,6 +98,10 @@ impl<'p, PfH: HandlePageFault> SoftPagedMem<'p, PfH> {
         action: fn(*mut u8, *mut u8, usize),
     ) -> Result<(), u64> {
         let (src, len) = if src < self.program.len() as _ {
+            if reason != MemoryAccessReason::Load {
+                return Err(src);
+            }
+
             let to_copy = len.clamp(0, self.program.len().saturating_sub(src as _));
             action(
                 unsafe { self.program.as_ptr().add(src as _).cast_mut() },