Fix libafl_qemu python bindings and example (#2030)

fuzzers/python_qemu/README.md

@@ -0,0 +1,17 @@
+# Python LibAFL QEMU
+
+## Build
+
+First, install python bindings (check `LibAFL/bindings/pylibafl`) and use the virtual environment.
+
+Then, create the `in` folder and put some input inside
+```bash
+$ mkdir in
+$ echo aaaaa > in/input
+```
+
+## Run
+
+```bash
+$ python fuzzer.py
+```

fuzzers/python_qemu/fuzzer.py

@@ -6,7 +6,7 @@ import lief
 MAX_SIZE = 0x100
 BINARY_PATH = './a.out'
 
-emu = qemu.Emulator(['qemu-x86_64', BINARY_PATH], [])
+emu = qemu.Qemu(['qemu-x86_64', BINARY_PATH], [])
 
 elf = lief.parse(BINARY_PATH)
 test_one_input = elf.get_function_address("LLVMFuzzerTestOneInput")

libafl_qemu/src/emu.rs

@@ -1813,6 +1813,12 @@ pub mod pybind {
             Ok(Qemu { qemu })
         }
 
+        fn run(&self) {
+            unsafe {
+                self.qemu.run().unwrap();
+            }
+        }
+
         fn write_mem(&self, addr: GuestAddr, buf: &[u8]) {
             unsafe {
                 self.qemu.write_mem(addr, buf);

libafl_sugar/src/qemu.rs

@@ -209,7 +209,7 @@ where
             let mut harness = |input: &BytesInput| {
                 let target = input.target_bytes();
                 let buf = target.as_slice();
-                (harness_bytes)(buf);
+                harness_bytes(buf);
                 ExitKind::Ok
             };