[原创]JNIOnLoad 获取未导出函数的绝对地址-软件逆向-看雪-安全社区|安全招聘|kanxue.com

[原创]JNIOnLoad 获取未导出函数的绝对地址

发表于: 2021-9-24 17:42 6067

[原创]JNIOnLoad 获取未导出函数的绝对地址

80962572

2021-9-24 17:42

6067

哎,论坛搜了一圈没找到怎么获取获取未导出函数的绝对地址,自己当初学习时也是走了不少弯路啊,自己写一个吧,希望能帮助到你.

js脚本hook.js:

修改你的so

执行命令:frida -U -f com.gdufs.xman -l hook.js --no-pause

找到我要的函数名称和地址:

下面找so的地址:

计算函数的导出地址:ptr(0xdd6fb1f9).sub("0xdd6fa000")

搞定!!!

function hook_libart() {

    var module_libart = Process.findModuleByName("libart.so");

    var symbols = module_libart.enumerateSymbols();     //枚举模块的符号

    var addr_Register = null;

    for(var i = 0; i < symbols.length; i++) {

        var name = symbols[i].name;

        if(name.indexOf("CheckJNI") == -1 && name.indexOf("JNI") > 0) {

            if(name.indexOf("RegisterNatives") > 0) {

                console.log("name: ", name);

                addr_Register = symbols[i].address;

                console.log("addr_Register: ", addr_Register);

            }

        }

    }
 
    var base_myjni = Module.findBaseAddress("libmyjni.so");

    console.log('Module.findBaseAddress("libmyjni.so"): ', base_myjni);

    if(addr_Register) {

        Interceptor.attach(addr_Register, {

            onEnter: function(args) {

                var java_class = Java.vm.tryGetEnv().getClassName(args[1]);

                console.log("java_class: ", java_class);

                var methods = args[2];

                console.log("methods: ", methods);

                var methods_count = parseInt(args[3]);

                console.log("methods_count: ", methods_count);

                for(var i = 0; i < methods_count; i ++) {

                    console.log("----------");

                    console.log(methods.add(i * Process.pointerSize * 3).readPointer().readCString());

                    console.log(methods.add(i * Process.pointerSize * 3 + Process.pointerSize).readPointer().readCString());

                    console.log(methods.add(i * Process.pointerSize * 3 + Process.pointerSize * 2).readPointer());

                    console.log("----------");

                }

            },onLeave: function(retval) {
 
            }

        })

    }
}
function main() {

    hook_libart();
}
 
setImmediate(main);