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<article class="single summary" itemscope itemtype="http://schema.org/Article"><h1 class="single-title" itemprop="name headline">
<a href="/2023/09/re-host/">Contiki Re-hosting 小记</a>
</h1><div class="post-meta"><span class="post-author"><a href="/" title="Author" rel=" author" class="author"><i class="fas fa-user-circle fa-fw"></i>x1do0</a></span> <span class="post-publish">published on <time datetime="2023-09-27">2023-09-27</time></span> <span class="post-category">included in <a href="/categories/general/"><i class="far fa-folder fa-fw"></i>General</a></span></div><div class="content"><p>本文记录如何用 Unicorn 模拟执行操作系统 Contiki-NG，并在上面复现并利用 CVE-2023-23609 的故事。</p></div><div class="post-footer">
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<a href="/2023/05/rev_main/">逆向方法论</a>
</h1><div class="post-meta"><span class="post-author"><a href="/" title="Author" rel=" author" class="author"><i class="fas fa-user-circle fa-fw"></i>x1do0</a></span> <span class="post-publish">published on <time datetime="2023-05-04">2023-05-04</time></span> <span class="post-category">included in <a href="/categories/general/"><i class="far fa-folder fa-fw"></i>General</a></span></div><div class="content"><p>年初 SECCON CTF 22 final 上第二天出了一道 KoH 题：给定 binary 要求写出源码，判定标准为编译后与目标 binary 的 diff，越小则分数越高。每一小时更换一门语言，从 c,c++ 到 d, go, web assembly 等等。我读完题目就放弃了因为我知道我的逆向水平就是依托答辩，而队友也不负众望基本一整天都在爆杀全场。我在崇拜之余不由得思考起一个问题，逆向应该怎么学？</p></div><div class="post-footer">
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<a href="/2022/07/actf2022-kkk/">ACTF2022 kkk 赛后复现</a>
</h1><div class="post-meta"><span class="post-author"><a href="/" title="Author" rel=" author" class="author"><i class="fas fa-user-circle fa-fw"></i>x1do0</a></span> <span class="post-publish">published on <time datetime="2022-07-17">2022-07-17</time></span> <span class="post-category">included in <a href="/categories/pwn/"><i class="far fa-folder fa-fw"></i>PWN</a></span></div><div class="content"><div class="details admonition info open">
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<i class="icon fas fa-info-circle fa-fw"></i>Info<i class="details-icon fas fa-angle-right fa-fw"></i>
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<div class="admonition-content">Yet another signin (kernel) pwn challenge. <strong>4 Solved</strong></div>
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<p>感谢 Nu1L 和 AAA 的几位师傅分享思路。</p></div><div class="post-footer">
<a href="/2022/07/actf2022-kkk/">Read More</a></div>
</article><article class="single summary" itemscope itemtype="http://schema.org/Article"><h1 class="single-title" itemprop="name headline">
<a href="/2022/01/afl-rsc4/">AFL 源码分析（完）变异详解</a>
</h1><div class="post-meta"><span class="post-author"><a href="/" title="Author" rel=" author" class="author"><i class="fas fa-user-circle fa-fw"></i>x1do0</a></span> <span class="post-publish">published on <time datetime="2022-01-28">2022-01-28</time></span> <span class="post-category">included in <a href="/categories/general/"><i class="far fa-folder fa-fw"></i>General</a></span></div><div class="content"><p>本文将细致阐述 AFL 变异方式，包括各阶段的变异算子与次数等细节。变异模式是固定的，所以变异细节看上去繁琐又无趣。但正如白皮书中提到，“它被认为是一个被实践证实有效的 hack 行为集合，把这些行为以最简单、最健壮的形式实现便得到了 AFL”，经验主义的产物是不可小觑的。</p></div><div class="post-footer">
<a href="/2022/01/afl-rsc4/">Read More</a></div>
</article><article class="single summary" itemscope itemtype="http://schema.org/Article"><h1 class="single-title" itemprop="name headline">
<a href="/2022/01/afl-rsc3/">AFL 源码分析（三）forkserver 详解</a>
</h1><div class="post-meta"><span class="post-author"><a href="/" title="Author" rel=" author" class="author"><i class="fas fa-user-circle fa-fw"></i>x1do0</a></span> <span class="post-publish">published on <time datetime="2022-01-26">2022-01-26</time></span> <span class="post-category">included in <a href="/categories/general/"><i class="far fa-folder fa-fw"></i>General</a></span></div><div class="content"><p>AFL 源源不断地将变异得到的测试用例喂给待测试程序，这个过程中少不了 fork 与 execve. 为提高效率、减少开销，它实现了一套 forkserver 机制来反复运行并测试程序。</p></div><div class="post-footer">
<a href="/2022/01/afl-rsc3/">Read More</a></div>
</article><article class="single summary" itemscope itemtype="http://schema.org/Article"><h1 class="single-title" itemprop="name headline">
<a href="/2022/01/afl-rsc2/">AFL 源码分析（二）路径覆盖信息 & 队列优胜者</a>
</h1><div class="post-meta"><span class="post-author"><a href="/" title="Author" rel=" author" class="author"><i class="fas fa-user-circle fa-fw"></i>x1do0</a></span> <span class="post-publish">published on <time datetime="2022-01-23">2022-01-23</time></span> <span class="post-category">included in <a href="/categories/general/"><i class="far fa-folder fa-fw"></i>General</a></span></div><div class="content"><p>紧接上一部分，本文将更进一步探讨 AFL 如何在运行时保存和分析路径覆盖信息，以及队列优胜者的选取思路。前者为启发式变异提供导向，后者为 <a href="https://xidoo.top/2022/01/afl-white-book/#4-%E8%AF%AD%E6%96%99%E5%BA%93%E7%B2%BE%E7%AE%80-culling-the-corpus" target="_blank" rel="noopener noreffer">culling the corpus</a> 的基础。</p></div><div class="post-footer">
<a href="/2022/01/afl-rsc2/">Read More</a></div>
</article><article class="single summary" itemscope itemtype="http://schema.org/Article"><h1 class="single-title" itemprop="name headline">
<a href="/2022/01/afl-rsc/">AFL 源码分析（一）从 0 到 1 再到 n</a>
</h1><div class="post-meta"><span class="post-author"><a href="/" title="Author" rel=" author" class="author"><i class="fas fa-user-circle fa-fw"></i>x1do0</a></span> <span class="post-publish">published on <time datetime="2022-01-09">2022-01-09</time></span> <span class="post-category">included in <a href="/categories/general/"><i class="far fa-folder fa-fw"></i>General</a></span></div><div class="content"><p><a href="https://github.com/google/AFL/blob/master/afl-fuzz.c" target="_blank" rel="noopener noreffer">afl-fuzz.c</a> 概览，后续重点将放在 forkserver 和启发式变异细节上。</p></div><div class="post-footer">
<a href="/2022/01/afl-rsc/">Read More</a></div>
</article><article class="single summary" itemscope itemtype="http://schema.org/Article"><h1 class="single-title" itemprop="name headline">
<a href="/2022/01/afl-white-book/">AFL 白皮书翻译与读书笔记</a>
</h1><div class="post-meta"><span class="post-author"><a href="/" title="Author" rel=" author" class="author"><i class="fas fa-user-circle fa-fw"></i>x1do0</a></span> <span class="post-publish">published on <time datetime="2022-01-01">2022-01-01</time></span> <span class="post-category">included in <a href="/categories/general/"><i class="far fa-folder fa-fw"></i>General</a></span></div><div class="content"><p>原文地址 <a href="https://lcamtuf.coredump.cx/afl/technical_details.txt" target="_blank" rel="noopener noreffer">https://lcamtuf.coredump.cx/afl/technical_details.txt</a></p></div><div class="post-footer">
<a href="/2022/01/afl-white-book/">Read More</a></div>
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