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Android动态调试so之dump内存数据
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<h3 id="配置环境"><a href="#配置环境" class="headerlink" title="配置环境"></a>配置环境</h3><p>一台已root手机</p>
<ul>
<li>IDA pro6.6</li>
<li>Android SDK</li>
</ul>
<p>准备工作： </p>
<ol>
<li>把Android SDK添加到环境变量中</li>
<li>把已root手机的系统中关键so拖到本地，必要时可以静态读取，获取系统函数的偏移地址。 例如把手机系统的<code>system/lib</code>的文件拖到本地<code>debugging</code>文件夹中。<br><code>adb pull /system/lib .\debugging\lib</code></li>
<li>在IDA pro6.6中找出<code>android_server</code>，并把<code>android_server</code>放到手机<code>system/bin</code>中。push的时候没有root权限，可以如下操作：<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br></pre></td><td class="code"><pre><span class="line">adb push android_server /data/local/tmp</span><br><span class="line">adb shell</span><br><span class="line">su</span><br><span class="line">cp /data/local/tmp/android_server /system/lib</span><br></pre></td></tr></table></figure>
<a id="more"></a>
</li>
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<h3 id="环境启动"><a href="#环境启动" class="headerlink" title="环境启动"></a>环境启动</h3><p>由于需要调试程序启动加载的so，所以步骤比较多。</p>
<ol>
<li>进入<code>adb shell</code>，在手机中执行<code>android_server</code>。<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line">adb shell</span><br><span class="line">su</span><br><span class="line">android_server</span><br></pre></td></tr></table></figure></li>
<li>进行端口转发<br><code>adb forward tcp:23946 tcp:23946</code></li>
<li>使用调试模式启动程序，<code>adb shell am start -D -n 包名/类名</code>，以上一篇博文的<code>dexunshellram</code>为例，<code>dexunshellram</code>动态加载了<code>crackme0201</code>，启动命令如下：<br><code>adb shell am start -D -n com.droider.dexunshellram/com.droider.crackme0201.MainActivity</code></li>
<li>打开IDA6.6，打开需要调试的so，然后选择<code>Debugger->Select debugger</code>，选择<code>Remote ARM Linux/Android debugger</code>。<br>然后选择<code>Debugger->Debugger options</code>，勾选所有<code>logging</code>和<code>Events</code>里的<code>Suspend on thread start/exit</code>和<code>Suspend on library load/unload</code>。<br>然后选择<code>Debugger->process options</code>，在<code>Hostname</code>中填写<code>127.0.0.1</code>，端口默认为<code>23946</code>。<br>然后选择<code>Debugger->attach a process</code>，选择<code>com.droider.dexunshellram</code>。<br>然后可能出现如下图所示，需要<code>add map</code>，由于之前把手机系统的<code>system/lib</code>复制到电脑中，这样可以指定到电脑的相应文件夹中，这样就可以静态调试系统so。如果你觉得你用不着调试系统函数，可以不用指定。<br><a href="https://www.mak-blog.com/album/2015/06/android-dynamic-debug-so1.png"><img src="https://www.mak-blog.com/album/2015/06/android-dynamic-debug-so1.png" alt="image0"></a></li>
<li>在Android SDK中找出<code>ddms.bat</code>，双击打开，为了后面执行jdb。</li>
<li>在IDA中点击运行或者按F9，然后在cmd中运行一下命令启动jdb<br><code>jdb -connect com.sun.jdi.SocketAttach:hostname=127.0.0.1,port=8700</code></li>
<li>IDA在linker中停下了，然后在path中找到相应调试的<code>libunshellram.so</code>，选择函数<code>Java_com_droider_dexunshellram_unshellram_loadDex</code>，这里是内存动态加载dex的地方。在else语句之前进行断点，就是<code>loc_</code>前一行插入断点，按F2，然后再运行程序，按F9。</li>
</ol>
<h3 id="dump内存"><a href="#dump内存" class="headerlink" title="dump内存"></a>dump内存</h3><p>如下图所示，R0寄存器<code>BE8F9144-48</code>保存着dex文件的地址。<br><a href="https://www.mak-blog.com/album/2015/06/android-dynamic-debug-so2.png"><img src="https://www.mak-blog.com/album/2015/06/android-dynamic-debug-so2.png" alt="image1"></a><br>可以看出寄存器保存的地址为<code>0x7653E008</code><br><a href="https://www.mak-blog.com/album/2015/06/android-dynamic-debug-so3.png"><img src="https://www.mak-blog.com/album/2015/06/android-dynamic-debug-so3.png" alt="image2"></a><br>查看<code>0x7653E018</code>地址可以看出存储的就是dex文件，dex文件是<code>dex.035</code>开头的。而<code>0x7653E038-3B</code>存储着是dex文件的长度<code>25C5BC</code><br><a href="https://www.mak-blog.com/album/2015/06/android-dynamic-debug-so4.png"><img src="https://www.mak-blog.com/album/2015/06/android-dynamic-debug-so4.png" alt="image3"></a><br>把以下脚本保存成<code>dump.py</code>，通过在<code>file->Script File</code>，选择<code>dump.py</code>。然后输入<code>0x7653E018</code>，输入长度<code>0x25C5BC</code>，最后输入保存的文件<code>C:\\classes.dex</code>。</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br></pre></td><td class="code"><pre><span class="line">import struct</span><br><span class="line">def dumpdex(start, len, target):</span><br><span class="line"> rawdex = idaapi.dbg_read_memory(start, len)</span><br><span class="line"> fd = open(target, 'wb')</span><br><span class="line"> fd.write(rawdex)</span><br><span class="line"> fd.close()</span><br><span class="line"></span><br><span class="line">def getdexlen(start):</span><br><span class="line"> pos = start + 0x20</span><br><span class="line"> mem = idaapi.dbg_read_memory(pos, 4)</span><br><span class="line"> len = struct.unpack(' 0 and start > 0x0 and target and AskYN(1, 'start is 0x%0x, len is %d, dump to %s' % (start, len, target)) == 1:</span><br><span class="line"> dumpdex(start, len, target)</span><br><span class="line"> print('Dump Finish')</span><br></pre></td></tr></table></figure>
<p>把dex文件dump到C盘中，由于是<code>crackme0201</code>的<code>classes.dex</code>，如果把dex放回之前博文的<code>crackme0201</code>的apk中，可以正常启动应用。</p>
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