Check memory page flag

Author: mohanson

fuzz/fuzz_targets/snapshot2.rs

@@ -4,8 +4,8 @@ use ckb_vm::{
     machine::VERSION2,
     memory::{round_page_down, round_page_up, FLAG_EXECUTABLE, FLAG_FREEZED},
     snapshot2::{DataSource, Snapshot2Context},
-    Bytes, CoreMachine, DefaultMachine, DefaultMachineBuilder, Error, Memory, DEFAULT_MEMORY_SIZE,
-    ISA_A, ISA_B, ISA_IMC, ISA_MOP, RISCV_PAGESIZE,
+    Bytes, CoreMachine, DefaultMachine, DefaultMachineBuilder, Error, Memory, SupportMachine,
+    DEFAULT_MEMORY_SIZE, ISA_A, ISA_B, ISA_IMC, ISA_MOP, RISCV_PAGESIZE,
 };
 use ckb_vm_definitions::asm::AsmCoreMachine;
 use libfuzzer_sys::fuzz_target;
@@ -183,6 +183,7 @@ fuzz_target!(|data: [u8; 96]| {
             .memory_mut()
             .load_bytes((i * RISCV_PAGESIZE) as u64, RISCV_PAGESIZE as u64)
             .unwrap();
+
         if mem1 != mem2 {
             eprintln!("mem1[0..32] = {:?}", &mem1[0..32]);
             eprintln!("mem2[0..32] = {:?}", &mem2[0..32]);
@@ -196,5 +197,12 @@ fuzz_target!(|data: [u8; 96]| {
             }
             panic!("The memory restored by operation resume is not same as snapshot operation at page {}", i);
         }
+
+        let flag1 = machine1.memory_mut().fetch_flag(i as u64);
+        let flag2 = machine2.memory_mut().fetch_flag(i as u64);
+
+        if flag1 != flag2 {
+            panic!("Flag at page {}", i);
+        }
     }
 });