diff --git a/lab5/antiasan.c b/lab5/antiasan.c
index 8a8936d..24694c0 100644
--- a/lab5/antiasan.c
+++ b/lab5/antiasan.c
@@ -1,6 +1,14 @@
 #include <string.h>
+#include <stdint.h>
 
 void antiasan(unsigned long addr)
 {
+    uintptr_t shadow_addr = 0x7fff8000 + (addr / 8);
+    volatile uint8_t *shadow = (volatile uint8_t *)shadow_addr;
 
-}
+    for (uintptr_t i = 0; i < 0x1000; i++) {
+        shadow[i] = 0;
+    }
+
+    return;
+}
\ No newline at end of file