better fuzz.sh

afl-fuzz/Cargo.toml

@@ -13,4 +13,8 @@ features = ["single_instruction_test"]
 
 [[bin]]
 name = "show_testcase"
-path = "src/show_testcase.rs"
+path = "src/show_testcase.rs"
+
+[[bin]]
+name = "check_input_size"
+path = "src/check_input_size.rs"

afl-fuzz/fuzz.sh

@@ -1 +1,2 @@
-cargo afl build --release && cargo afl fuzz -i in -o out ../target/release/afl-fuzz -g 10k
+export AFL_AUTORESUME=1
+cargo afl build --release && cargo afl fuzz -i in -o out -g $(cargo run --bin check_input_size) ../target/release/afl-fuzz

afl-fuzz/src/check_input_size.rs

@@ -0,0 +1,17 @@
+//! Finds out how many bytes of data have to be provided to build the mock state.
+
+use arbitrary::Arbitrary;
+use vm2::{MockWorld, VirtualMachine};
+
+fn main() {
+    let data = [2; 10000];
+    let mut u = arbitrary::Unstructured::new(&data);
+    let _: VmAndWorld = u.arbitrary().unwrap();
+    println!("{:?}", u.len());
+}
+
+#[derive(Arbitrary, Debug)]
+struct VmAndWorld {
+    _vm: VirtualMachine,
+    _world: MockWorld,
+}