Can't hook into constructor about frida-gum HOT 4 CLOSED

With Frida 10.0.10, Android 6.0.0, I can hook constructor with code below:

function print_args() {
    var str = "";
    for (var i = 0; i < arguments.length; i++) {
        str += arguments[i] + ", "
    }
    return str;
}

Java.perform(function () {
    var AudioRecord = Java.use("android.media.AudioRecord");

    AudioRecord.$init.overload("int", "int", "int", "int", "int").implementation = function (audioSource, sampleRateInHz, channelConfig, audioFormat, bufferSizeInBytes) {
        send("android.media.AudioRecord(" + this + ").<init>: " + print_args(audioSource, sampleRateInHz, channelConfig, audioFormat, bufferSizeInBytes));
        return this.$init(audioSource, sampleRateInHz, channelConfig, audioFormat, bufferSizeInBytes);
    };
});

If I use $new, it will give such error message: Error: Reimplementing $new is not possible. Please replace implementation of $init instead., so I use $init, and it works.

from frida-gum.

Ran into this same issue. Interestingly enough, depending on the way I hook it the results vary.

$new.overloads[i] will crash the app.

$new.overload() with apply(this, arguments) as the last line will freeze it with a black screen.

$new.overload() with anything else will crash the app.

from frida-gum.

I encountered the same problem on Android 6.0.1, with Frida 8.1.13. When I try to attach to a constructor of a Java class, the application crashes.

from frida-gum.

Thanks for pointing this out, @Piasy!

from frida-gum.