{"id":958,"date":"2024-07-27T13:35:33","date_gmt":"2024-07-27T05:35:33","guid":{"rendered":"https:\/\/shangwendada.top\/?p=958"},"modified":"2024-07-27T16:24:55","modified_gmt":"2024-07-27T08:24:55","slug":"android%e5%af%b9init_array%e6%ae%b5%e8%b0%83%e7%94%a8%e7%9a%84%e6%96%b9%e6%b3%95%e8%bf%9b%e8%a1%8chook","status":"publish","type":"post","link":"https:\/\/blog.shangwendada.top\/index.php\/2024\/07\/27\/android%e5%af%b9init_array%e6%ae%b5%e8%b0%83%e7%94%a8%e7%9a%84%e6%96%b9%e6%b3%95%e8%bf%9b%e8%a1%8chook\/","title":{"rendered":"[Android]\u5bf9init_array\u6bb5\u8c03\u7528\u7684\u65b9\u6cd5\u8fdb\u884cHook"},"content":{"rendered":"<h1>\u5bf9init_array\u6bb5\u8c03\u7528\u7684\u65b9\u6cd5\u8fdb\u884cHook<\/h1>\n<h2>\u524d\u8a00<\/h2>\n<p>\u5728\u67d0\u4e2a\u98ce\u548c\u65e5\u4e3d\u3001\u9633\u5149\u707f\u70c2\u3001\u4e07\u91cc\u65e0\u4e91\u3001\u7a7a\u6c14\u6e05\u65b0\u3001\u7eff\u6811\u6210\u836b\u3001\u8749\u9e23\u5982\u96f7\u3001\u708e\u70ed\u96be\u8010\u3001\u70c8\u65e5\u5f53\u7a7a\u3001\u70ed\u6d6a\u6eda\u6eda\u3001\u708e\u590f\u7099\u70e4\u3001\u708e\u708e\u590f\u65e5\u3001\u70c8\u65e5\u708e\u708e\u3001\u8273\u9633\u9ad8\u7167\u3001\u6674\u7a7a\u4e07\u91cc\u3001\u6691\u6c14\u903c\u4eba\u3001\u7099\u70ed\u7684\u9633\u5149\u3001\u70c8\u65e5\u708e\u708e\u3001\u6c57\u5982\u96e8\u4e0b\u3001\u706b\u8fa3\u8fa3\u7684\u5929\u6c14\u3001\u70c8\u65e5\u5f53\u7a7a\u3001\u9177\u70ed\u96be\u8010\u7684\u4e0b\u5348\uff0cDev1l\u5e08\u5085\u53d1\u6765\u4e86\u4e00\u4e2aFrida\u68c0\u6d4b\u7684\u5c0fDemo\uff0c\u53cd\u7f16\u8bd1\u540e\u53d1\u73b0\u4e3b\u8981\u903b\u8f91\u90fd\u5728init_array\u6bb5\uff0c\u6545\u5199\u4e0b\u672c\u7bc7\u6587\u7ae0\uff0c\u8bb0\u5f55\u4e0b\u63a2\u7d22\u4e2d\u5b66\u5230\u7684\u77e5\u8bc6\u3002<\/p>\n<h2>\u60c5\u666f\u590d\u73b0<\/h2>\n<p>\u7531\u4e8eDev\u7ed9\u7684Demo\u7528\u9014\u8fd8\u9700\u8981\u4fdd\u5bc6\uff0c\u56e0\u6b64\u8fd9\u91cc\u6211\u5199\u4e00\u4e2ainit_array\u6267\u884c\u903b\u8f91\u76f8\u540c\u7684Demo\uff0c\u6765\u6f14\u793a\u5982\u4f55\u901a\u8fc7Fridahook .init_array\u6bb5\u4e2d\u7684\u5185\u5bb9\u3002<\/p>\n<h3>Demo Java\u5c42\u5b9e\u73b0<\/h3>\n<pre><code class=\"language-java\">package com.swdd.testapp;\n\nimport androidx.appcompat.app.AppCompatActivity;\n\nimport android.os.Bundle;\nimport android.widget.TextView;\n\nimport com.swdd.testapp.databinding.ActivityMainBinding;\n\npublic class MainActivity extends AppCompatActivity {\n    static {\n        System.loadLibrary(&quot;testapp&quot;);\n    }\n    private ActivityMainBinding binding;\n    @Override\n    protected void onCreate(Bundle savedInstanceState) {\n        super.onCreate(savedInstanceState);\n\n        binding = ActivityMainBinding.inflate(getLayoutInflater());\n        setContentView(binding.getRoot());\n        TextView tv = binding.sampleText;\n        tv.setText(stringFromJNI());\n    }\n    public native String stringFromJNI();\n}<\/code><\/pre>\n<p>\u6ca1\u9519\u5c31\u662f\u7b80\u5355\u7684Android studio\u751f\u6210\u7684\u4e00\u4e2a\u6a21\u677f\uff0c\u52a0\u8f7d\u4e86Native\u65b9\u6cd5\u4e4b\u540e\u5c31\u4f1a\u66f4\u6539MainActivity\u6e32\u67d3\u7684\u4e00\u4e2aTextView\u3002<\/p>\n<h3>Native\u5c42\u5b9e\u73b0<\/h3>\n<pre><code class=\"language-cpp\">#include &lt;jni.h&gt;\n#include &lt;string&gt;\n\nextern &quot;C&quot; JNIEXPORT jstring JNICALL\nJava_com_swdd_testapp_MainActivity_stringFromJNI(\n        JNIEnv* env,\n        jobject \/* this *\/) {\n    std::string hello = &quot;Hello from C++&quot;;\n    return env-&gt;NewStringUTF(hello.c_str());\n}<\/code><\/pre>\n<p>\u672c\u8eabNative\u5c42\u662f\u8fd4\u56de\u4e00\u4e2aHello from C++\uff0c\u90a3\u6211\u4eec\u8981\u5982\u4f55\u5728.init_array\u4e2d\u8fd0\u884c\u5b83\u5462\u8bf7\u770b\u63a5\u4e0b\u6765\u7684\u4ee3\u7801\u3002<\/p>\n<pre><code class=\"language-cpp\">#include &lt;jni.h&gt;\n#include &lt;string&gt;\n#include &lt;android\/log.h&gt;\n\n#define LOG_TAG &quot;GenFunction&quot;\n#define LOGI(...) __android_log_print(ANDROID_LOG_INFO, LOG_TAG, __VA_ARGS__)\n\nchar Text[512] = &quot;Hello from C++&quot;;\n\nstatic void genText(const char * newText){\n    strcat(Text,newText);\n}\n\nstatic void Gen() __attribute__((constructor()));\nstatic void Gen(){\n    genText(&quot;\\nHello .init_array&quot;);\n}\n\nextern &quot;C&quot; JNIEXPORT jstring JNICALL\nJava_com_swdd_testapp_MainActivity_stringFromJNI(\n        JNIEnv* env,\n        jobject \/* this *\/) {\n    genText(&quot;\\nhello stringFromJNI&quot;);\n    return env-&gt;NewStringUTF(Text);\n}\n<\/code><\/pre>\n<p>\u6211\u4eec\u53ea\u9700\u8981\u5728\u9700\u8981\u653e\u5230.init_array\u4e2d\u8fd0\u884c\u7684\u65b9\u6cd5\u751f\u547d\u7684\u65f6\u5019\u52a0\u4e00\u6bb5\u63cf\u8ff0\u5c31\u597d<code>__attribute__((constructor()))<\/code>\u6b64\u5904\u5176\u5b9e\u4e5f\u53ef\u4ee5\u4f7f\u7528section\u53bb\u63cf\u8ff0\u6bb5\u540d\uff0c\u6211\u4eec\u8fd9\u91cc\u4f7f\u7528constructor\u5c31\u662f\u4ee3\u8868\u7684.init_arry\u6bb5\u3002\u63a5\u4e0b\u6765\u770b\u770bapp\u8fd0\u884c\u6548\u679c\u5427\uff1a<\/p>\n<p><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/shangwendada.top\/wp-content\/uploads\/2024\/07\/image-1722061832738.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  decoding=\"async\" data-original=\"https:\/\/shangwendada.top\/wp-content\/uploads\/2024\/07\/image-1722061832738.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"file\" \/><\/div><\/p>\n<p>\u8fd9\u91cc\u4e3a\u4e86\u65b9\u4fbf\u540e\u7eed\u6f14\u793a\uff0c\u6211\u5206\u522b\u5728.init_array\u4e2d\u548cstrFromJni\u4e2d\u5404\u8c03\u7528\u4e86\u4e00\u6b21\u3002<\/p>\n<h2>\u5c1d\u8bd5\u5f00\u59cbHOOK<\/h2>\n<p>\u9996\u5148\u6211\u4eec\u5bf9Native\u5c42\u8fdb\u884c\u5206\u6790\u3002<\/p>\n<p><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/shangwendada.top\/wp-content\/uploads\/2024\/07\/image-1722062529216.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  decoding=\"async\" data-original=\"https:\/\/shangwendada.top\/wp-content\/uploads\/2024\/07\/image-1722062529216.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"file\" \/><\/div><\/p>\n<p>\u6307\u7684\u6ce8\u610f\u7684\u662f\u6211\u4eec\u8fd9\u91cc\u7684genText\u662f\u975e\u5bfc\u51fa\u7684\u60c5\u51b5\uff0c\u6240\u4ee5\u6211\u4eec\u8ba8\u8bba\u7684\u4e5f\u662f\u975e\u5bfc\u51fa\u60c5\u51b5\u4e0b\u7684Hook\u3002<\/p>\n<p>\u9996\u5148\u6211\u4eec\u5728segments\u7a97\u53e3\u4e2d\u770b\u5230\u5404\u4e2a\u6bb5\u7684\u504f\u79fb<\/p>\n<p><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/shangwendada.top\/wp-content\/uploads\/2024\/07\/image-1722062609341.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  decoding=\"async\" data-original=\"https:\/\/shangwendada.top\/wp-content\/uploads\/2024\/07\/image-1722062609341.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"file\" \/><\/div><br \/>\n\u53cc\u51fb.init_array\u5373\u53ef\u8fdb\u5165\u3002<\/p>\n<p><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/shangwendada.top\/wp-content\/uploads\/2024\/07\/image-1722062638791.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  decoding=\"async\" data-original=\"https:\/\/shangwendada.top\/wp-content\/uploads\/2024\/07\/image-1722062638791.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"file\" \/><\/div><\/p>\n<p>\u8fd9\u91cc\u6211\u4eec\u53ef\u4ee5\u8bb0\u5f55\u4e0bgenText\u65b9\u6cd5\u7684\u504f\u79fb\u662f0x808<\/p>\n<p><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/shangwendada.top\/wp-content\/uploads\/2024\/07\/image-1722063067504.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  decoding=\"async\" data-original=\"https:\/\/shangwendada.top\/wp-content\/uploads\/2024\/07\/image-1722063067504.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"file\" \/><\/div><\/p>\n<p>\u8fd9\u6837\u6211\u4eec\u7b2c\u4e00\u6b21\u5c1d\u8bd5Hook:<\/p>\n<pre><code class=\"language-javascript\">function main() {\n    Java.perform(function () {\n        var baseAddress = Module.getBaseAddress(&quot;libtestapp.so&quot;);\n        console.log(baseAddress);\n        Interceptor.attach(baseAddress.add(0x808), {\n            onEnter: function (args) {\n                var input = args[0].readUtf8String();\n                console.log(&quot;Hook Success -&gt; &quot;, input);\n            }, onLeave: function (retval) { }\n        });\n    });\n}\n\/\/setImmediate(main);\nsetTimeout(main, 200);<\/code><\/pre>\n<p><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/shangwendada.top\/wp-content\/uploads\/2024\/07\/image-1722064629422.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  decoding=\"async\" data-original=\"https:\/\/shangwendada.top\/wp-content\/uploads\/2024\/07\/image-1722064629422.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"file\" \/><\/div><br \/>\n\u6b64\u65f6\u53d1\u73b0\u95ee\u9898\uff0c\u6211\u4eec\u5982\u679c\u4f7f\u7528<code>setTimeout(main,200)<\/code>\u7684\u8bdd\u5c31\u53ea\u80fdHook\u5230fromJni\u4e86\uff0c.init_array\u7531\u4e8e\u65f6\u95f4\u95ee\u9898\u5bfc\u81f4\u65e0\u6cd5HOOK\uff0c\u90a3\u4e48\u6211\u4eec\u5982\u679c\u6539\u6210setImmediate\u4f1a\u5982\u4f55\u5462\uff1a<\/p>\n<p><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/shangwendada.top\/wp-content\/uploads\/2024\/07\/image-1722065079693.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  decoding=\"async\" data-original=\"https:\/\/shangwendada.top\/wp-content\/uploads\/2024\/07\/image-1722065079693.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"file\" \/><\/div><br \/>\n\u7531\u4e8e\u65f6\u95f4\u8fc7\u65e9\uff0c\u8fd8\u6ca1\u6709\u52a0\u8f7d\u5230libtestapp.so\u6211\u4eec\u5c31\u5f00\u59cbhook\u4e86\u5bfc\u81f4\u8fdb\u7a0b\u62a5\u9519\u3002<\/p>\n<h2>\u89e3\u51b3\u601d\u8def<\/h2>\n<p>\u9996\u5148\u6839\u636eso\u7684\u52a0\u8f7d\u673a\u5236\uff1a<\/p>\n<pre><code class=\"language-cpp\">  +---------------------+         +------------------------+\n  |                     |         |                        |\n  |    Java Runtime     |         |    Native Runtime      |\n  |  (Dalvik\/ART VM)    |         |   (Native Executable)  |\n  |                     |         |                        |\n  +---------------------+         +------------------------+\n             |                               |\n             |                               |\n             |       System.loadLibrary()    |\n             |------------------------------&gt;|\n             |                               |\n             |                               |\n             |          Runtime Linker       |\n             |       (e.g., ld.so on Linux)  |\n             |                               |\n             |  +-------------------------+  |\n             |  |                         |  |\n             |  |     Load .so File       |  |\n             |  |     (dlopen)            |  |\n             |  |                         |  |\n             |  +-------------------------+  |\n             |               |               |\n             |               |               |\n             |  +-------------------------+  |\n             |  |                         |  |\n             |  |  Resolve Symbols        |  |\n             |  |  (dlsym)                |  |\n             |  |                         |  |\n             |  +-------------------------+  |\n             |               |               |\n             |               |               |\n             |  +-------------------------+  |\n             |  |                         |  |\n             |  |  Initialize .so         |  |\n             |  |                         |  |\n             |  +-------------------------+  |\n             |               |               |\n             |               |               |\n             |  +-------------------------+  |\n             |  |                         |  |\n             |  |  Execution              |  |\n             |  |  (Invoke Native Code)   |  |\n             |  |                         |  |\n             |  +-------------------------+  |\n             |                               |\n             |                               |\n<\/code><\/pre>\n<p>\u90a3\u4e48\u6700\u5f00\u59cb\u8981\u542f\u52a8\u7684\u80af\u5b9a\u662fdlopen\u4e86\uff0c\uff08\u5728 android 7.0 \u4e4b\u540e\u4f7f\u7528\u7684\u662f android_dlopen_ext\uff09\uff0c\u8be5\u65b9\u6cd5\u50a8\u5b58\u5728libdl.so \u4e2d\uff0c\u56e0\u6b64\u6211\u4eec\u9996\u5148\u53ef\u4ee5\u901a\u8fc7\u52a0\u8f7dlibdl.so\uff0c\u5bf9android_dlopen_ext\u8fdb\u884cHook\uff0c\u6765\u83b7\u53d6\u66f4\u65e9\u7684\u65f6\u673a\u3002<\/p>\n<h3>Hook android_dlopen_ext:<\/h3>\n<pre><code class=\"language-javascript\">function main() {\n    var dlopenAdd = Module.findExportByName(&quot;libdl.so&quot;, &quot;android_dlopen_ext&quot;);\n    Interceptor.attach(dlopenAdd, {\n        onEnter: function (args) {\n            console.log(&quot;Loaded dlopen with -&gt; &quot; + args[0].readCString());\n        }, onLeave(retVal) {\n\n        }\n    })\n}\nsetImmediate(main);\n<\/code><\/pre>\n<p><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/shangwendada.top\/wp-content\/uploads\/2024\/07\/image-1722066558968.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  decoding=\"async\" data-original=\"https:\/\/shangwendada.top\/wp-content\/uploads\/2024\/07\/image-1722066558968.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"file\" \/><\/div><\/p>\n<p>\u53ef\u4ee5\u53d1\u73b0\u52a0\u8f7dlibtestapp.so\u7684\u65f6\u673a\u8fd8\u633a\u65e9\u7684\uff0c\u63a5\u4e0b\u6765\u6211\u4eec\u5c31\u8981\u5bf9libtestapp.so\u8fd9\u4e2a\u5b57\u6bb5\u505a\u8fc7\u6ee4\u4e86\uff0c\u627e\u5230libtestapp.so\u624d\u505a\u5904\u7406<\/p>\n<pre><code class=\"language-javascript\">function main() {\n    var dlopenAdd = Module.findExportByName(&quot;libdl.so&quot;, &quot;android_dlopen_ext&quot;);\n    Interceptor.attach(dlopenAdd, {\n        onEnter: function (args) {\n            if (args[0].readCString().indexOf(&quot;libtestapp.so&quot;) != -1) {\n                console.log(&quot;Loaded dlopen with -&gt; &quot; + args[0].readCString());\n\n            }\n        }, onLeave(retVal) {\n\n        }\n    })\n}\nsetImmediate(main);<\/code><\/pre>\n<p>\u5982\u679c\u6b64\u65f6\u76f4\u63a5Hook\u4f9d\u65e7\u4f1a\u4ea7\u751f\u62a5\u9519\uff1a<\/p>\n<p><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/shangwendada.top\/wp-content\/uploads\/2024\/07\/image-1722066991753.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  decoding=\"async\" data-original=\"https:\/\/shangwendada.top\/wp-content\/uploads\/2024\/07\/image-1722066991753.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"file\" \/><\/div><\/p>\n<p>\u8bf4\u660e\u65f6\u673a\u4f9d\u65e7\u8fd8\u662f\u592a\u65e9\u4e86\uff0c\u90a3\u4e48\u5982\u4f55\u64cd\u4f5c\u5462\uff0c\u6211\u4eec\u770b\u5230\u5982\u4e0b\u6d41\u7a0b\uff1a<\/p>\n<pre><code class=\"language-cpp\"> +------------------------+             +-------------------------+\n |                        |             |                         |\n |   Android Framework    |             |     Native Executable   |\n |                        |             |                         |\n +------------------------+             +-------------------------+\n             |                                   |\n             |         loadLibrary(&quot;mylib&quot;)      |\n             |----------------------------------&gt;|\n             |                                   |\n             |         Runtime Linker (ld.so)    |\n             |----------------------------------&gt;|\n             |                                   |\n             |       Find and Load mylib.so      |\n             |----------------------------------&gt;|\n             |                                   |\n             |          Call Constructors        |\n             |        (callConstructorAdd)       |\n             |----------------------------------&gt;|\n             |                                   |\n             |                                   |\n             |            Initialize             |\n             |              (init_array)         |\n             |----------------------------------&gt;|\n             |                                   |\n             |              Execute              |\n             |            (main function)        |\n             |----------------------------------&gt;|\n             |                                   |\n<\/code><\/pre>\n<p>\u53ef\u4ee5\u53d1\u73b0Init_array\u4e4b\u524d\u8fd8\u6709\u4e00\u4e2a Call Constructors , \u8fd9\u4e2a\u65f6\u5019\u5df2\u7ecf\u52a0\u8f7d\u4e86libtestapp.so\u4e86\uff0c\u6211\u4eec\u5373\u53ef\u8fdb\u884c\u64cd\u4f5c\u3002<\/p>\n<h3>Hook callConstructorAdd<\/h3>\n<p>callConstructorAdd\u51fd\u6570\u5728\u7f16\u8bd1\u540e\u5bfc\u51fa\u540d\u5b57\u4e3a:<code>__dl__ZN6soinfo17call_constructorsEv <\/code><br \/>\nSymbols =  Process.getModuleByName(&quot;linker64&quot;).enumerateSymbols(); \u53bb\u83b7\u53d6\u4ed6\u7684\u76f8\u5bf9\u504f\u79fb\u5c31\u597d\u4e86\u3002<\/p>\n<pre><code class=\"language-javascript\">\nfunction startHook() {\n    Java.perform(function () {\n\n        var baseAddress = Module.getBaseAddress(&quot;libtestapp.so&quot;);\n        console.log(baseAddress);\n        Interceptor.attach(baseAddress.add(0x808), {\n            onEnter: function (args) {\n                var input = args[0].readUtf8String();\n                console.log(&quot;Hook Success -&gt; &quot;, input);\n            }, onLeave: function (retval) { }\n        });\n\n    });\n}\n\nfunction main() {\n    var dlopenAdd = Module.findExportByName(&quot;libdl.so&quot;, &quot;android_dlopen_ext&quot;);\n    Interceptor.attach(dlopenAdd, {\n        onEnter: function (args) {\n            if (args[0].readCString().indexOf(&quot;libtestapp.so&quot;) != -1) {\n                console.log(&quot;Loaded dlopen with -&gt; &quot; + args[0].readCString());\n                var Symbols = Process.getModuleByName(&quot;linker64&quot;).enumerateSymbols();\n                for (var index = 0; index &lt; Symbols.length; index++) {\n                    if (Symbols[index].name.indexOf(&quot;__dl__ZN6soinfo17call_constructorsEv&quot;) != -1) {\n                        console.log(&quot;callConstructorAdd -&gt; &quot; , Symbols[index].address);\n                    }\n                }\n            }\n        }, onLeave(retVal) {\n\n        }\n    })\n}\nsetImmediate(main);\n\/\/setTimeout(main, 200);<\/code><\/pre>\n<p>\u8fd9\u6837\u6211\u4eec\u5c31\u62ff\u5230\u4e86callConstructorAdd\u5185\u5b58\u4e2d\u7684\u5730\u5740\uff1a<br \/>\n<div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/shangwendada.top\/wp-content\/uploads\/2024\/07\/image-1722068194814.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  decoding=\"async\" data-original=\"https:\/\/shangwendada.top\/wp-content\/uploads\/2024\/07\/image-1722068194814.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"file\" \/><\/div><br \/>\n\u63a5\u4e0b\u6765\u5c31\u53ef\u4ee5Hook\u5b83\u4e86\uff1a<\/p>\n<pre><code class=\"language-javascript\">function main() {\n    var dlopenAdd = Module.findExportByName(&quot;libdl.so&quot;, &quot;android_dlopen_ext&quot;);\n    Interceptor.attach(dlopenAdd, {\n        onEnter: function (args) {\n            if (args[0].readCString().indexOf(&quot;libtestapp.so&quot;) != -1) {\n                console.log(&quot;Loaded dlopen with -&gt; &quot; + args[0].readCString());\n                var Symbols = Process.getModuleByName(&quot;linker64&quot;).enumerateSymbols();\n                for (var index = 0; index &lt; Symbols.length; index++) {\n                    if (Symbols[index].name.indexOf(&quot;__dl__ZN6soinfo17call_constructorsEv&quot;) != -1) {\n                        console.log(&quot;callConstructorAdd -&gt; &quot;, Symbols[index].address);\n                        Interceptor.attach(Symbols[index].address, {\n                            onEnter: function (args) {\n                                console.log(&quot;callConstructorAdd Called!&quot;);\n                            }, onLeave: function (retval) { }\n                        });\n                    }\n                }\n            }\n        }, onLeave(retVal) {\n\n        }\n    })\n}\nsetImmediate(main);<\/code><\/pre>\n<p><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/shangwendada.top\/wp-content\/uploads\/2024\/07\/image-1722068322362.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  decoding=\"async\" data-original=\"https:\/\/shangwendada.top\/wp-content\/uploads\/2024\/07\/image-1722068322362.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"file\" \/><\/div><\/p>\n<p>\u8fd9\u4e2a\u65f6\u5019\u6211\u4eec\u53d1\u73b0\u8c03\u7528\u4e86\u975e\u5e38\u591a\u6b21\uff0c\u6240\u4ee5\u6211\u4eec\u9700\u8981\u505a\u4e00\u4e2aHook\u8fc7\u7684\u6807\u8bb0\uff0cHook\u8fc7\u4e4b\u540e\u5c31\u4e0d\u518dhook\u4e86\uff0c\u63a5\u4e0b\u6765\u6211\u4eec\u518d\u8c03\u7528hook .init_array\u4e2d\u8c03\u7528\u7684\u65b9\u6cd5\u7684\u4ee3\u7801\uff1a<br \/>\n<div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/shangwendada.top\/wp-content\/uploads\/2024\/07\/image-1722068525644.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  decoding=\"async\" data-original=\"https:\/\/shangwendada.top\/wp-content\/uploads\/2024\/07\/image-1722068525644.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"file\" \/><\/div><\/p>\n<h3>EXP:<\/h3>\n<p>\u6ce8\u610fStartHook\u5728onLeave\u548conEnter\u4e2d\u6548\u679c\u662f\u4e00\u6837\u7684\u3002<\/p>\n<pre><code class=\"language-javascript\">\nfunction startHook() {\n    Java.perform(function () {\n\n        var baseAddress = Module.getBaseAddress(&quot;libtestapp.so&quot;);\n        console.log(baseAddress);\n        Interceptor.attach(baseAddress.add(0x808), {\n            onEnter: function (args) {\n                var input = args[0].readUtf8String();\n                console.log(&quot;Hook Success -&gt; &quot;, input);\n            }, onLeave: function (retval) { }\n        });\n\n    });\n}\n\nfunction main() {\n    var dlopenAdd = Module.findExportByName(&quot;libdl.so&quot;, &quot;android_dlopen_ext&quot;);\n    var isHooked = false;\n    Interceptor.attach(dlopenAdd, {\n        onEnter: function (args) {\n            if (args[0].readCString().indexOf(&quot;libtestapp.so&quot;) != -1) {\n                console.log(&quot;Loaded dlopen with -&gt; &quot; + args[0].readCString());\n                var Symbols = Process.getModuleByName(&quot;linker64&quot;).enumerateSymbols();\n                for (var index = 0; index &lt; Symbols.length; index++) {\n                    if (Symbols[index].name.indexOf(&quot;__dl__ZN6soinfo17call_constructorsEv&quot;) != -1) {\n                        console.log(&quot;callConstructorAdd -&gt; &quot;, Symbols[index].address);\n                        Interceptor.attach(Symbols[index].address, {\n                            onEnter: function (args) {\n                                if (!isHooked) {\n                                    console.log(&quot;callConstructorAdd Called!&quot;);\n                                    isHooked = true;\n                                    startHook();\n                                }\n                            }, onLeave: function (retval) { }\n                        });\n                    }\n                }\n            }\n        }, onLeave(retVal) {\n\n        }\n    })\n}\nsetImmediate(main);\n\/\/setTimeout(main, 200);\n<\/code><\/pre>\n<h2>\u7ed3\u5c3e:<\/h2>\n<p>\u672c\u6587\u53c2\u8003\uff1a<a href=\"https:\/\/www.jianshu.com\/p\/59d1d3054abe\">https:\/\/www.jianshu.com\/p\/59d1d3054abe<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5bf9init_array\u6bb5\u8c03\u7528\u7684\u65b9\u6cd5\u8fdb\u884cHook \u524d\u8a00 \u5728\u67d0\u4e2a\u98ce\u548c\u65e5\u4e3d\u3001\u9633\u5149\u707f\u70c2\u3001\u4e07\u91cc\u65e0\u4e91\u3001\u7a7a\u6c14\u6e05\u65b0\u3001\u7eff\u6811\u6210\u836b\u3001 [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[13,1],"tags":[],"class_list":["post-958","post","type-post","status-publish","format-standard","hentry","category-android","category-uncategorized"],"_links":{"self":[{"href":"https:\/\/blog.shangwendada.top\/index.php\/wp-json\/wp\/v2\/posts\/958","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/blog.shangwendada.top\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/blog.shangwendada.top\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/blog.shangwendada.top\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/blog.shangwendada.top\/index.php\/wp-json\/wp\/v2\/comments?post=958"}],"version-history":[{"count":20,"href":"https:\/\/blog.shangwendada.top\/index.php\/wp-json\/wp\/v2\/posts\/958\/revisions"}],"predecessor-version":[{"id":994,"href":"https:\/\/blog.shangwendada.top\/index.php\/wp-json\/wp\/v2\/posts\/958\/revisions\/994"}],"wp:attachment":[{"href":"https:\/\/blog.shangwendada.top\/index.php\/wp-json\/wp\/v2\/media?parent=958"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blog.shangwendada.top\/index.php\/wp-json\/wp\/v2\/categories?post=958"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blog.shangwendada.top\/index.php\/wp-json\/wp\/v2\/tags?post=958"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}