From fd950132ceb6103f06d3bcf7b0339b95cfaf3bb0 Mon Sep 17 00:00:00 2001
From: "Hui, Chunyang" <sanqian.hcy@antfin.com>
Date: Tue, 10 May 2022 11:02:24 +0000
Subject: [PATCH] Fix chunk manager munmap range

When the munmap range is bigger than the Multi-VMA chunk's range, the
bound was wrong and the munmap will misbehave.
---
 src/libos/src/vm/vm_chunk_manager.rs | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/libos/src/vm/vm_chunk_manager.rs b/src/libos/src/vm/vm_chunk_manager.rs
index eb082538..7a89db76 100644
--- a/src/libos/src/vm/vm_chunk_manager.rs
+++ b/src/libos/src/vm/vm_chunk_manager.rs
@@ -141,7 +141,9 @@ impl ChunkManager {
     }
 
     pub fn munmap_range(&mut self, range: VMRange) -> Result<()> {
-        let bound = range.start();
+        // The bound should be no smaller than the chunk range's start address.
+        let bound = range.start().max(self.range.start());
+
         let current_pid = current!().process().pid();
 
         // The cursor to iterate vmas that might intersect with munmap_range.