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<!DOCTYPE html>
<html lang="zh-CN">
<head>
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<meta name="description" content="个人技术博客">
<meta property="og:type" content="website">
<meta property="og:title" content="WuTao's Blog">
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<a href="/" class="brand" rel="start">
<span class="logo-line-before"><i></i></span>
<h1 class="site-title">WuTao's Blog</h1>
<span class="logo-line-after"><i></i></span>
</a>
<p class="site-subtitle" itemprop="description">while(!(succeed = try()));</p>
</div>
<div class="site-nav-right">
<div class="toggle popup-trigger">
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<input autocomplete="off" autocapitalize="off"
placeholder="搜索..." spellcheck="false"
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<div class="back-to-top">
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<span>0%</span>
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<main class="main">
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<article itemscope itemtype="http://schema.org/Article" class="post-block" lang="zh-CN">
<link itemprop="mainEntityOfPage" href="http://wutao18.github.io/2020/11/01/Lilac-Pwn-stack4-stack-pivoting-Writeup/">
<span hidden itemprop="author" itemscope itemtype="http://schema.org/Person">
<meta itemprop="image" content="/images/avatar.png">
<meta itemprop="name" content="吴涛">
<meta itemprop="description" content="个人技术博客">
</span>
<span hidden itemprop="publisher" itemscope itemtype="http://schema.org/Organization">
<meta itemprop="name" content="WuTao's Blog">
</span>
<header class="post-header">
<h2 class="post-title" itemprop="name headline">
<a href="/2020/11/01/Lilac-Pwn-stack4-stack-pivoting-Writeup/" class="post-title-link" itemprop="url">Lilac Pwn stack4-stack_pivoting Writeup</a>
</h2>
<div class="post-meta">
<span class="post-meta-item">
<span class="post-meta-item-icon">
<i class="far fa-calendar"></i>
</span>
<span class="post-meta-item-text">发表于</span>
<time title="创建时间：2020-11-01 14:16:03 / 修改时间：14:19:21" itemprop="dateCreated datePublished" datetime="2020-11-01T14:16:03+08:00">2020-11-01</time>
</span>
<span class="post-meta-item">
<span class="post-meta-item-icon">
<i class="far fa-folder"></i>
</span>
<span class="post-meta-item-text">分类于</span>
<span itemprop="about" itemscope itemtype="http://schema.org/Thing">
<a href="/categories/%E7%AB%9E%E8%B5%9B/" itemprop="url" rel="index"><span itemprop="name">竞赛</span></a>
</span>
</span>
<span id="/2020/11/01/Lilac-Pwn-stack4-stack-pivoting-Writeup/" class="post-meta-item leancloud_visitors" data-flag-title="Lilac Pwn stack4-stack_pivoting Writeup" title="阅读次数">
<span class="post-meta-item-icon">
<i class="fa fa-eye"></i>
</span>
<span class="post-meta-item-text">阅读次数：</span>
<span class="leancloud-visitors-count"></span>
</span>
<span class="post-meta-item">
<span class="post-meta-item-icon">
<i class="far fa-comment"></i>
</span>
<span class="post-meta-item-text">Valine：</span>
<a title="valine" href="/2020/11/01/Lilac-Pwn-stack4-stack-pivoting-Writeup/#valine-comments" itemprop="discussionUrl">
<span class="post-comments-count valine-comment-count" data-xid="/2020/11/01/Lilac-Pwn-stack4-stack-pivoting-Writeup/" itemprop="commentCount"></span>
</a>
</span>
<br>
<span class="post-meta-item" title="本文字数">
<span class="post-meta-item-icon">
<i class="far fa-file-word"></i>
</span>
<span class="post-meta-item-text">本文字数：</span>
<span>1.9k</span>
</span>
<span class="post-meta-item" title="阅读时长">
<span class="post-meta-item-icon">
<i class="far fa-clock"></i>
</span>
<span class="post-meta-item-text">阅读时长 ≈</span>
<span>2 分钟</span>
</span>
</div>
</header>
<div class="post-body" itemprop="articleBody">
<p><a href="http://pwn.hitctf.cn:8000/challenges" target="_blank" rel="noopener">题目链接</a></p>
<!--noindex-->
<div class="post-button">
<a class="btn" href="/2020/11/01/Lilac-Pwn-stack4-stack-pivoting-Writeup/#more" rel="contents">
阅读全文 »
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<footer class="post-footer">
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<article itemscope itemtype="http://schema.org/Article" class="post-block" lang="zh-CN">
<link itemprop="mainEntityOfPage" href="http://wutao18.github.io/2020/11/01/CTFHUB-Pwn-ret2shellcode-Writeup/">
<span hidden itemprop="author" itemscope itemtype="http://schema.org/Person">
<meta itemprop="image" content="/images/avatar.png">
<meta itemprop="name" content="吴涛">
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</span>
<header class="post-header">
<h2 class="post-title" itemprop="name headline">
<a href="/2020/11/01/CTFHUB-Pwn-ret2shellcode-Writeup/" class="post-title-link" itemprop="url">CTFHUB Pwn ret2shellcode Writeup</a>
</h2>
<div class="post-meta">
<span class="post-meta-item">
<span class="post-meta-item-icon">
<i class="far fa-calendar"></i>
</span>
<span class="post-meta-item-text">发表于</span>
<time title="创建时间：2020-11-01 14:13:19 / 修改时间：14:20:29" itemprop="dateCreated datePublished" datetime="2020-11-01T14:13:19+08:00">2020-11-01</time>
</span>
<span class="post-meta-item">
<span class="post-meta-item-icon">
<i class="far fa-folder"></i>
</span>
<span class="post-meta-item-text">分类于</span>
<span itemprop="about" itemscope itemtype="http://schema.org/Thing">
<a href="/categories/%E7%AB%9E%E8%B5%9B/" itemprop="url" rel="index"><span itemprop="name">竞赛</span></a>
</span>
</span>
<span id="/2020/11/01/CTFHUB-Pwn-ret2shellcode-Writeup/" class="post-meta-item leancloud_visitors" data-flag-title="CTFHUB Pwn ret2shellcode Writeup" title="阅读次数">
<span class="post-meta-item-icon">
<i class="fa fa-eye"></i>
</span>
<span class="post-meta-item-text">阅读次数：</span>
<span class="leancloud-visitors-count"></span>
</span>
<span class="post-meta-item">
<span class="post-meta-item-icon">
<i class="far fa-comment"></i>
</span>
<span class="post-meta-item-text">Valine：</span>
<a title="valine" href="/2020/11/01/CTFHUB-Pwn-ret2shellcode-Writeup/#valine-comments" itemprop="discussionUrl">
<span class="post-comments-count valine-comment-count" data-xid="/2020/11/01/CTFHUB-Pwn-ret2shellcode-Writeup/" itemprop="commentCount"></span>
</a>
</span>
<br>
<span class="post-meta-item" title="本文字数">
<span class="post-meta-item-icon">
<i class="far fa-file-word"></i>
</span>
<span class="post-meta-item-text">本文字数：</span>
<span>478</span>
</span>
<span class="post-meta-item" title="阅读时长">
<span class="post-meta-item-icon">
<i class="far fa-clock"></i>
</span>
<span class="post-meta-item-text">阅读时长 ≈</span>
<span>1 分钟</span>
</span>
</div>
</header>
<div class="post-body" itemprop="articleBody">
<p><a href="https://www.ctfhub.com/#/skilltree" target="_blank" rel="noopener">题目链接</a></p>
<!--noindex-->
<div class="post-button">
<a class="btn" href="/2020/11/01/CTFHUB-Pwn-ret2shellcode-Writeup/#more" rel="contents">
阅读全文 »
</a>
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<span>1 分钟</span>
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<p><a href="http://pwn.hitctf.cn:8000/challenges" target="_blank" rel="noopener">题目链接</a></p>
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<span>9 分钟</span>
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<h2 id="进程内存布局"><a href="#进程内存布局" class="headerlink" title="进程内存布局"></a>进程内存布局</h2><p>32 位保护模式下 Linux 中进程的内存布局如下：</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><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br></pre></td><td class="code"><pre><span class="line"></span><br><span class="line">0xFFFFFFFF ------> +----------------------+ <--+ </span><br><span class="line"> | | | </span><br><span class="line"> | OS Kernel | | 1GB</span><br><span class="line"> | | |</span><br><span class="line">0xC0000000 ------> +----------------------+ <--+ </span><br><span class="line"> | | | |</span><br><span class="line"> | | stack | |</span><br><span class="line"> v | | |</span><br><span class="line"> +----------------------+ |</span><br><span class="line"> | | |</span><br><span class="line"> +----------------------+ |</span><br><span class="line"> | Memory Mapping Region| |</span><br><span class="line">0x40000000 ------> +----------------------+ |</span><br><span class="line"> | | |</span><br><span class="line"> +----------------------+ |</span><br><span class="line"> ^ | | |</span><br><span class="line"> | | heap | | 3GB</span><br><span class="line"> | | | |</span><br><span class="line"> +----------------------+ |</span><br><span class="line"> | Read/Write Segments | |</span><br><span class="line"> | .bss | |</span><br><span class="line"> | .data | |</span><br><span class="line"> +----------------------+ |</span><br><span class="line"> | Read-only Segments | |</span><br><span class="line"> | .init .text .rodata | |</span><br><span class="line"> | | |</span><br><span class="line">0x08048000 ------> +----------------------+ |</span><br><span class="line"> | reserved | |</span><br><span class="line">0x00000000 ------> +----------------------+ <--+</span><br></pre></td></tr></table></figure>
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<h2 id="线性回归"><a href="#线性回归" class="headerlink" title="线性回归"></a>线性回归</h2><p><strong>线性模型</strong>：</p>
<script type="math/tex; mode=display">y = \boldsymbol{w}^T \boldsymbol{x} + b \tag{1}</script><p>数据集：$D = \{(\boldsymbol{x}_1, y_1), (\boldsymbol{x}_2, y_2), … , (\boldsymbol{x}_m, y_m)\}$，$\boldsymbol{x}_i = (x_{i1}; x_{i2};…; x_{id})$</p>
<p><strong>损失函数</strong> (Loss function) 采用平方损失：</p>
<script type="math/tex; mode=display">
L(\boldsymbol{w}, b) = \sum_{i=1}^m (y_i - \hat{y_i})^2</script><script type="math/tex; mode=display">
= \sum_{i=1}^m (y_i - (\boldsymbol{w}^T \boldsymbol{x}_i + b))^2
\tag{2}</script><p>目标是找到一组解 $(\boldsymbol{w}^{\star}, b^{\star})$ 使得损失函数的值最小，即：</p>
<script type="math/tex; mode=display">
(\boldsymbol{w}^*, b^*) = \mathop{arg\ min}\limits_{(\boldsymbol{w}, b)}L(\boldsymbol{w}, b)</script><script type="math/tex; mode=display">
= \mathop{arg\ min}\limits_{(\boldsymbol{w}, b)} \sum_{i=1}^m (y_i - (\boldsymbol{w}^T \boldsymbol{x}_i + b))^2
\tag{3}</script>
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<p>比赛链接：<a href="https://codingcompetitions.withgoogle.com/kickstart/round/000000000019ffc7" target="_blank" rel="noopener">kick start Round A 2020</a></p>
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<p>bitset 一般代替 bool 数组使用，常用于优化空间，因为 bitset 中一个元素只占 1 bit。</p>
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