findExportByName is cleaning up injected module

[Xoffio]

Hi!

I am loading a js script and then injecting a lib into a program.

...
        // Load the script into the target process.
        session.create_script(script_source, &mut script_option);
        script.load();

        println!("[*] Script loaded.");
...
        let injected_id = match frida_cmds_handle_error(
            local_device_for_inj.inject_library_file_sync(
                pid,
                &inj_lib_path,
                "injected",
                Vec::new(),
            ),
            &cmd_res_tx,
            false,
        ) {
            Some(id) => id,
            None => continue,
        };
        println!("[*] Injected library: {}", injected_id);
...

I want to leave the injected lib loaded at all times to send commands to it.

I want to send commands to it by having a function in my Js script, so I can call the function in the injected lib. Like this:

function callFn(modPath, fnName) {
	// Get the address of the function
	var fn_addr = Module.findExportByName(modPath, fnName);

	// Create the function
	var fn = new NativeFunction(ptr(fn_addr), 'void', []);

	// Call the function
	fn();
}

I noticed that every time I do Module.findExportByName or Module.getExportByName the injected lib gets unloaded or cleaned up... Even when I do it with the frida cli

The way I am testing this is the next:

• Execute the target program.
• Execute the rust program that injects a lib (libinjected.so)
• Once the lib is injected I check that it is still loaded by typing lsof -p (ps -ax | grep TARGET_PROGRAM | grep -v "grep" | awk '{print $1}') | grep inject
• Then I connect with frida cli or call the js function with rust Module.findExportByName
• Check with lsof you will see that the lib stop showing up.

Is there anything I am doing wrong? or a better way to do this? I think this is a bug but let me know!

[s1341]

Is it possible that this is a lifetime issue?