{"id":1777,"date":"2023-01-25T14:16:36","date_gmt":"2023-01-25T06:16:36","guid":{"rendered":"http:\/\/eotstxtab.top\/?p=1777"},"modified":"2023-01-25T14:16:55","modified_gmt":"2023-01-25T06:16:55","slug":"%e8%ae%ba%e6%96%87%e9%98%85%e8%af%bb%ef%bc%9aeuro-sp-2022-ddfuzz-fuzzing-with-data-dependency-information","status":"publish","type":"post","link":"http:\/\/43.142.23.155\/?p=1777","title":{"rendered":"\u8bba\u6587\u9605\u8bfb\uff1a[Euro S&amp;P 2022] DDFuzz: Fuzzing with Data Dependency Information"},"content":{"rendered":"\n<p>The LLVM framework applies some optimizations to construct its internal Dependence Graph [5], such as considering strongly connected components as a single node (the so-called P-Node).<\/p>\n\n\n\n<p>Code\uff1a<\/p>\n\n\n\n<p><a href=\"https:\/\/github.com\/elManto\/DDFuzz\">https:\/\/github.com\/elManto\/DDFuzz<\/a><\/p>\n\n\n\n<p>\u5728AFL\u57fa\u7840\u4e0a\u5f15\u5165 data dependency graphs\uff08DDGs\uff09<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"512\" height=\"88\" src=\"http:\/\/43.142.23.155\/wp-content\/uploads\/2023\/01\/image-1.png\" alt=\"\" class=\"wp-image-1780\" srcset=\"http:\/\/43.142.23.155\/wp-content\/uploads\/2023\/01\/image-1.png 512w, http:\/\/43.142.23.155\/wp-content\/uploads\/2023\/01\/image-1-300x52.png 300w\" sizes=\"auto, (max-width: 512px) 100vw, 512px\" \/><\/figure>\n<\/div>\n\n\n<h2 class=\"wp-block-heading\">1. \u80cc\u666f\/\u51fa\u53d1\u70b9<\/h2>\n\n\n\n<p>\u4f5c\u8005\u8ba4\u4e3aDDGs\u4e2d\u7684\u4fe1\u606f\u53ef\u4ee5\u4e3afuzzer\u63d0\u4f9b\u4e00\u4e2aCFG\u65e0\u6cd5\u6355\u6349\u5230\u7684\u989d\u5916\u7684feedback<\/p>\n\n\n\n<p>\u4f5c\u8005\u57fa\u4e8eAFL++\u548cLLVM\uff0c\u5728Fuzzer\u901a\u8fc7CFG\u5956\u52b1\u7684\u540c\u65f6\uff0c\u5728\u63a2\u7d22\u65b0\u7684DDG edge\u7684\u65f6\u5019\u4e5f\u4f1a\u5f97\u5230\u5956\u52b1\u2014\u2014DDFuzz<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">1.1 \u6570\u636e\u4f9d\u8d56\u56fe Data Dependency Graphs<\/h3>\n\n\n\n<p>\u4ecb\u7ecdlink\u2192<a href=\"https:\/\/www.notion.so\/d6bd14345b764211bf9c774f9ff8f12e\">\u4f20\u9001\u95e8<\/a><\/p>\n\n\n\n<h2 class=\"wp-block-heading\">2. \u5b9e\u73b0 Methodology and Implementation<\/h2>\n\n\n\n<p>\u501f\u52a9LLVM pass\u5b9e\u73b0\uff0c\u7248\u672cLLVM13<\/p>\n\n\n\n<p>\u9009\u62e9LLVM\u7684\u539f\u56e0\uff1a\u9996\u5148\uff0c\u4e2d\u95f4\u8868\u793aIR\u662f <a href=\"https:\/\/www.notion.so\/d6bd14345b764211bf9c774f9ff8f12e\"><\/a><a href=\"https:\/\/www.notion.so\/d6bd14345b764211bf9c774f9ff8f12e\">\u9759\u6001\u5355\u8d4b\u503c\uff08Single Static Assignment\uff0cSSA\uff09<\/a>\u5f62\u5f0f\uff0c\u8fd9\u610f\u5473\u7740\u6bcf\u4e2a\u53d8\u91cf\u53ea\u5206\u914d\u4e00\u6b21\uff0c\u6240\u6709\u53d8\u91cf\u5fc5\u987b\u5728\u7b2c\u4e00\u6b21\u4f7f\u7528\u4e4b\u524d\u5b9a\u4e49\uff0c \u8fd9\u7b80\u5316\u4e86\u4e0e\u5141\u8bb8\u4f7f\u7528\u591a\u4e2a\u5b9a\u4e49\u7684\u5176\u4ed6\u4ee3\u7801\u8868\u793a\u76f8\u5173\u7684LLVM IR\u53d8\u91cf\u4e4b\u95f4\u7684\u4f9d\u8d56\u5173\u7cfb\u7684\u6062\u590d\uff1b\u5176\u6b21\uff0cLLVM\u5de5\u5177\u94fe\u5df2\u7ecf\u5f88\u597d\u5730\u96c6\u6210\u5230\u6d41\u884c\u7684Fuzz\u9879\u76ee\u4e2d\uff0c\u56e0\u6b64\u65b0\u89e3\u51b3\u65b9\u6848\u53ef\u4ee5\u5f88\u5bb9\u6613\u5730\u5728\u73b0\u6709\u7684Fuzz\u6280\u672f\u4e2d\u5b9e\u73b0\u3002<\/p>\n\n\n\n<p>DDFuzz\u5b9e\u73b0\u8fc7\u7a0b\u5c06\u5206\u4e3a\u4e09\u4e2a\u4e3b\u8981\u90e8\u5206\uff1a DDG\u6784\u5efa\u3001\u4f9d\u8d56\u8fc7\u6ee4\u548c\u76ee\u6807\u68c0\u6d4b\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">2.1 DDG\u6784\u5efa<\/h3>\n\n\n\n<p>\u5b9e\u73b0\u9759\u6001\u5206\u6790\u90e8\u5206\u65f6\uff0c\u9996\u5148\u8981\u9009\u62e9\u5408\u9002\u7684LLVM IR\u53d8\u91cf\u6765\u6784\u5efa\u6570\u636e\u4f9d\u8d56\u56fe\u3002\u6700\u76f4\u89c2\u7684\u65b9\u6cd5\u662f\u901a\u8fc7\u4f9d\u8d56 <a href=\"https:\/\/www.notion.so\/d6bd14345b764211bf9c774f9ff8f12e\">def-use edge<\/a> \u6765\u8868\u793a\u4f9d\u8d56\u5173\u7cfb\uff0c\u6765\u6062\u590dLLVM IR\u4e2d\u51fa\u73b0\u7684\u6bcf\u4e2a\u53d8\u91cf\u7684\u4f9d\u8d56\u5173\u7cfb\u3002\u7136\u800c\uff0c\u4f5c\u8005\u6ce8\u610f\u5230\uff0c\u8fd9\u79cd\u6280\u672f\u5e76\u4e0d\u9002\u5408\u8be5\u6280\u672f\u7684\u5e94\u7528\u73af\u5883\u3002\u8fd9\u662f\u56e0\u4e3aIR\u7684SSA\u5f62\u5f0f\u4f1a\u4ea7\u751f\u592a\u591a\u7684\u4f9d\u8d56\u5173\u7cfb\uff0c\u53cd\u8fc7\u6765\u5c06\u5bfc\u81f4fuzzer\u7684\u53cd\u9988\u4e0d\u4f73\uff0c\u6267\u884c\u76ee\u6807\u4e8c\u8fdb\u5236\u6587\u4ef6\u65f6\u5c06\u4ea7\u751f\u5de8\u5927\u7684\u5f00\u9500\u3002<\/p>\n\n\n\n<p>LLVM \u6846\u67b6\u672c\u8eab\u53ef\u4ee5\u6784\u9020 internal Dependence Graph, \u4f8b\u5982\u5c06\u5f3a\u94fe\u63a5\u7684\u7ec4\u4ef6\u4f5c\u4e3a\u5355\u4e2a\u8282\u70b9 \uff08strongly connected components as a single node (P-Node)\uff09\u3002\u672c\u6587\u5c06\u8fd9\u4e2a\u79f0\u4e3a$DDG_{raw}$\u3002<\/p>\n\n\n\n<p>\u4f5c\u8005\u8ba4\u4e3a\u5e94\u8be5\u53ea\u8003\u8651only a subset of LLVM variables\uff0c\u4e5f\u5c31\u662fLLVM\u53d8\u91cf\u4e2d\u7684\u4e00\u4e2a\u5b50\u96c6\u800c\u5e76\u975e\u5168\u90e8\uff0c\u5173\u6ce8\u8fd9\u4e9b\u53d8\u91cf\u7684\u5b9a\u4e49\u548c\u4f7f\u7528\uff08\u5f15\u7528\uff09\uff0c\u5e76\u4e14\u8fd9\u6837\u5c31\u53ea\u9700\u8981\u6062\u590d\u548c\u8fd9\u4e2a\u5b50\u96c6\u76f8\u5173\u7684\u6570\u636e\u4f9d\u8d56\u5173\u7cfb\u3002\u9996\u5148\u5bf9\u4e8e\u4e8c\u8fdb\u5236\u5f62\u6001\u7684\u6587\u4ef6\u800c\u8a00\uff0c\u6570\u636e\u6d41\u5b9e\u9645\u4e0a\u53ea\u5728\u5185\u5b58\u8bfb\u5199\u7684\u65f6\u5019\u7684\u53d1\u751f\u3002\u5728IR\u5c42\u9762\u4e0a\u6765\u8bf4\uff0c\u4f7f\u5f97\u4f5c\u8005\u5c06\u6307\u4ee4\u7684Load\u548cStore\u4f5c\u4e3a\u6570\u636e\u6d41\u7684Source\u548cSink\u3002\u672c\u6587\u5728\u6b64\u57fa\u7840\u4e0a\u8fd8\u589e\u52a0\u4e86Call\u6307\u4ee4\uff0c\u7528\u4e8e\u8ddf\u8e2a\u53d8\u91cf\u7684\u4f7f\u7528\uff0c\u6bd4\u5982\uff0c\u6211\u4eec\u53ef\u4ee5\u8ddf\u8e2a\u51fd\u6570\u8c03\u7528\u53c2\u6570\u7684\u4f9d\u8d56\u5173\u7cfb\u3002\u6700\u540e\u6211\u4eec\u4f7f\u7528<a href=\"https:\/\/www.notion.so\/a2f00f5ac70a467d9c008c35f4c74bd0\">Alloca\u6307\u4ee4<\/a>\u4f5c\u4e3adef-use edge\u7684\u6f5c\u5728\u7684source\u3002\u5c3d\u7ba1\u7f16\u8bd1\u5668\u5728\u4f18\u5316\u8fc7\u7a0b\u4e2d\u4f1a\u5c06\u5f88\u591aAlloca\u6307\u4ee4\u4f18\u5316\u6389\uff0c\u4f46\u662f\u4ed6\u4ecd\u662f\u6709\u6548\u7684\u3002<\/p>\n\n\n\n<p>\u5982\u4e0bAlgorithm 1\u5c31\u662f\u672c\u6587\u7684\u89e3\u51b3\u65b9\u6848\uff0c\u5176\u4e2d\u6700\u4e3b\u8981\u7684\u4e24\u4e2a\u6570\u636e\u7ed3\u6784\u5206\u522b\u662f\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>DDG\u672c\u8eab(a map of sets)<\/li>\n\n\n\n<li>\u4e00\u4e2a\u88ab\u79f0\u4e3aData Flow Tracker (DFT)\u7684\u6570\u636e\u7ed3\u6784\uff0c\u5728\u7b97\u6cd5\u5f00\u59cb\u65f6\u4e5f\u521d\u59cb\u5316\u4e3a\u96c6\u5408\u6620\u5c04\u3002<\/li>\n<\/ul>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/43.142.23.155\/wp-content\/uploads\/2023\/01\/image.png\" alt=\"\" class=\"wp-image-1779\" width=\"507\" height=\"433\" srcset=\"http:\/\/43.142.23.155\/wp-content\/uploads\/2023\/01\/image.png 950w, http:\/\/43.142.23.155\/wp-content\/uploads\/2023\/01\/image-300x257.png 300w, http:\/\/43.142.23.155\/wp-content\/uploads\/2023\/01\/image-768x657.png 768w, http:\/\/43.142.23.155\/wp-content\/uploads\/2023\/01\/image-670x573.png 670w\" sizes=\"auto, (max-width: 507px) 100vw, 507px\" \/><\/figure>\n<\/div>\n\n\n<p>\u5c31\u4e0a\u56fe\u4f2a\u4ee3\u7801\uff0cblocks\u662f\u6240\u6709bb\u7684\u96c6\u5408\uff0c\u901a\u8fc7GetBasicBlocks()\u5f97\u5230\uff1b\u540c\u7406instructions\u662f\u5355\u72ecbb\u4e0b\u7684\u6240\u6709\u6307\u4ee4\u7684\u96c6\u5408\uff1b<\/p>\n\n\n\n<p>8\u884c\u7684IsDefinition()\u51fd\u6570\u5224\u522b\u8be5\u6307\u4ee4\u662f\u5426\u4e3adef\u6307\u4ee4\u5373 Load \u548c Alloca\uff0c\u82e5\u8fd4\u56de\u4e3atrue\u5219\u5c06\u6307\u4ee4 i \u5bf9\u5e94\u7684value\u6dfb\u52a0\u5230DFT\u4e2d\u7684\u4e00\u4e2a\u65b0\u7684\u6761\u76ee\uff1b<\/p>\n\n\n\n<p>\u5bf9\u4e8e\u4e00\u822c\u7684\u6307\u4ee4\uff0811\u884cIsGeneric()\uff09\uff0c\u4e5f\u5c31\u662f\u90a3\u4e9b\u65e2\u4e0d\u662fSourse\u4e5f\u4e0d\u662fSink\u7684\u6307\u4ee4\uff0c\u4e00\u822c\u63d0\u53d6value\u548c<a href=\"https:\/\/www.notion.so\/To-do-List-Kisna-aba246c62faa45c8af2dcba6fb067ac3\">\u64cd\u4f5c\u6570ops<\/a>\u5373\u53ef\uff0c\u7136\u540e\u4ecb\u7ecd\u4e86InsertDataFlow()\u8fd9\u4e2a\u539f\u8bed\uff0c\u4f46\u662f\u6ca1\u61c2\u4ec0\u4e48\u610f\u601d\uff1aThe primitive InsertDataFlow is then responsible to track the fact that the return value is actually depending on the operands variables\uff0c\u5927\u6982\u597d\u50cf\u662f\u8bf4value\u4e0eops\u76f8\u5173\u3002<\/p>\n\n\n\n<p>\u63a5\u7740\u6211\u4eec\u5c06Getuse()\u5f97\u5230\u7684\u6307\u4ee4\uff08\u5176\u5b9e\u5c31\u662f\u90a3\u4e9buse instructions\uff09\u904d\u5386\uff0c\u7528QueryDataFlow()\u4e5f\u662f\u4e00\u4e2a\u539f\u8bed\uff0c\u7528\u4e8e\u8fed\u4ee3DFT\u4e2d\u7684key\u5bfb\u627eu(use instructions)\u6240\u5bf9\u5e94\u7684\u96c6\u5408\u4e2d\u7684\u5143\u7d20\uff0c\u4ece\u800c\u627e\u5230u\u6240\u4f9d\u8d56\u7684\u5168\u90e8\u5b9a\u4e49\u3002\u6700\u7ec8\u8f93\u51fa\u4e00\u4e2a\u6570\u636e\u4f9d\u8d56\u56fe\uff0c\u5176\u4e2d\u7684\u8fb9edge\u8fde\u63a5\u53d8\u91cfD\u7684\u5b9a\u4e49def\u548c\u4f9d\u8d56\u4e8eD\u7684\u53d8\u91cf\u7684\u4f7f\u7528use\uff0c\u672c\u6587\u79f0\u8be5\u7c7b\u578b\u7684DDG\u4e3aDDG_{Full}\u3002<\/p>\n\n\n\n<p>\u6309\u7167\u6211\u5bf9DDG_{Full}\u7684\u7406\u89e3\uff0c\u4e3e\u4f8b\u5982\u4e0b:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>int a = 1; \/\/A<br>int b = 2; \/\/B<br>int c, d; \/\/C1 C2<br>c = a + b; \/\/D<br>d = c + a; \/\/E<\/code><\/pre>\n\n\n\n<p>\u8bed\u53e5E\u4e2d\u6d89\u53ca\u5230c\u7684\u4f7f\u7528\uff0c\u6240\u4ee5\u5728DDG\u4e2d\u4f1a\u8fde\u63a5\u5230c\u7684\u5b9a\u4e49\uff0c\u4ee5\u53cac\u6240\u4f9d\u8d56\u7684\u6240\u6709\u6bd4\u5982a\u548cb\u7684\u5b9a\u4e49\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">2.2 Filtering \u8fc7\u6ee4\u5668<\/h3>\n\n\n\n<p>\u672c\u6587\u8003\u8651\u7684\u76ee\u6807\u662f\u8f7b\u91cf\u5730\u5bf9\u7f16\u8bd1\u540e\u7684\u4e8c\u8fdb\u5236\u6587\u4ef6\u8fdb\u884c\u5206\u6790\uff0c\u56e0\u6b64\u5f15\u5165\u4f18\u5316Optimizations\u548c\u8fc7\u6ee4\u5668Filter\u51cf\u5c11\u63d2\u6869\u6570\u91cf\u3002Filters\u4f1a\u8fc7\u6ee4\u6389\u4e0d\u4f1a\u7ed9Fuzzer\u53cd\u9988\u7684edge\u3002\u90a3\u4e48\u9996\u5148\u7531\u4e8e\u672c\u6587\u7684\u57fa\u672c\u7c92\u5ea6\u662fbb\uff0c\u90a3\u4e48bb\u5185\u90e8\u7684\u4f9d\u8d56\u5173\u7cfb\u90fd\u53ef\u4ee5\u88ab\u8fc7\u6ee4\u6389\u3002\u7c7b\u4f3c\u7684\uff0c\u8fde\u63a5\u540c\u4e00\u5bf9bb\u7684\u591a\u4e2a\u4f9d\u8d56\u5173\u7cfb\u5e94\u8be5\u88ab\u5408\u5e76\u4e3a\u4e00\u4e2a\u3002<\/p>\n\n\n\n<p>DDG\u8986\u76d6\u63d2\u6869\u7684\u76ee\u7684\u4e0d\u5728\u4e8e\u5e2e\u52a9fuzzer\u5230\u8fbe\u591a\u5c42\u5d4c\u5957\u7684\u4ee3\u7801\u4f4d\u7f6e\uff0c\u800c\u662f\u5728\u8fd9\u6761\u8def\u5f84\u6d89\u53ca\u5230\u7684\u4f9d\u8d56\u4e2d\u5c1d\u8bd5\u627e\u5230\u65b0\u7684\u7a0b\u5e8f\u4f4d\u7f6e\uff08\u8986\u76d6\u4f4d\u7f6e\uff09\uff0c\u6216\u8005\u8bf4\u60f3\u5728\u5df2\u6709\u7684\u5206\u652f\u4e2d\u89e6\u53d1\u5230\u65b0\u7684\u8def\u5f84\u65b0\u7684\u5206\u652f\uff0c\u901a\u8fc7\u63a2\u7d22\u8fd9\u4e9b\u65b0\u7684\u6765\u53d1\u73b0\u7a0b\u5e8f\u65b0\u7684flaws\u3002\u6240\u4ee5\u63d2\u6869<\/p>\n\n\n\n<p>\u5b9e\u9645\u4e0a\u672c\u6587\u5b9e\u73b0\u4e86\u4e24\u4e2a\u4e3b\u8981\u7684\u8fc7\u6ee4\u89c4\u5219\u6765\u8fc7\u6ee4\u6389\u5197\u4f59\u7684\u6570\u636e\u4f9d\u8d56\u5173\u7cfb\u3002<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u89c4\u5219\u4e00\uff1a\u68c0\u67e5\u4e00\u4e2a\u4f9d\u8d56\u9879\u662f\u5426\u5728\u4e24\u4e2a\u76f8\u8fde\u7684\u57fa\u672c\u5757\u4e4b\u95f4\uff0c\u4e5f\u5c31\u662f\u8bf4\u5176\u4e2d\u4e00\u4e2abb\u662f\u5728CFG\u4e2d\u53e6\u4e00\u4e2a\u7684\u540e\u7ee7bb\u3002\u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b\uff0c\u4f9d\u8d56\u9879\u4e0d\u4f1a\u6dfb\u52a0\u4efb\u4f55\u5c1a\u672a\u88ab\u8fb9\u7f18\u8986\u76d6\u6355\u83b7\u7684\u9644\u52a0\u4fe1\u606f\uff0c\u4e0d\u7136\u53ea\u4f1a\u589e\u52a0\u5f00\u9500\u8fd8\u4e0d\u4f1a\u5411\u6a21\u7cca\u5668\u63d0\u4f9b\u4efb\u4f55\u6709\u7528\u7684\u53cd\u9988\u3002\u56e0\u6b64\u8fd9\u79cd\u60c5\u51b5\u4e0b\uff0c\u672c\u6587\u4e22\u5f03\u8fd9\u4e9b\u6570\u636e\u6d41\u3002<\/li>\n\n\n\n<li>\u89c4\u5219\u4e8c\uff1a\u6269\u5c55\u4e86\u89c4\u5219\u4e00\uff0c\u6db5\u76d6\u4e86\u4e00\u4e9b\u5176\u4ed6\u7684\u60c5\u51b5\uff0c\u6bd4\u5982\u5176\u4e2d\u6570\u636e\u4f9d\u8d56\u5173\u7cfb\u5df2\u7ecf\u88ab\u8fb9\u7f18\u8986\u76d6\u6293\u53d6\u5230\u3002 \u8fd9\u91cc\u53c8\u5b9a\u4e49\u8bf4\u660e\u4e86\u4e24\u4e2a\u989d\u5916\u7684\u6570\u636e\u6d41\uff1a\n<ol class=\"wp-block-list\">\n<li>\u4e00\u4e2a\u53d8\u91cf\u7684\u4f7f\u7528U\u53d6\u51b3\u4e8e\u552f\u4e00\u7684\uff08<strong>Single<\/strong>\uff09\u5b9a\u4e49D\uff0c\u8fd9\u4e2a\u5b9a\u4e49\u53ef\u4ee5\u5728U\u7684\u8bb8\u591a\u4e2a\u57fa\u672c\u5757\u4e4b\u524d\u88ab\u627e\u5230\u3002\u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b\uff0c\u672c\u6587\u6ce8\u610f\u5230\u6ca1\u5fc5\u8981\u5728\u6570\u636e\u7ed3\u6784\u4e2d\u4fdd\u7559\u4e24\u4e2abb\u4e4b\u95f4\u8fde\u63a5\u7684bb\uff0c\u56e0\u4e3a\u6839\u636edef\u6765\u8bf4\uff0c\u5982\u679c\u7a0b\u5e8f\u5230\u8fbe\u4e86\uff08\u591f\u5230\u4e86reach\uff09U\u6240\u5728\u7684\u4ee3\u7801\u5757\uff0c\u5c31\u610f\u5473\u7740\u4e00\u5b9a\u5df2\u7ecf\u7ecf\u8fc7\u4e86D\uff08\u56e0\u4e3a\u8fd9\u662f\u552f\u4e00\u5b9a\u4e49\uff09\u3002\u8fd9\u65f6\u5019\u4f20\u7edf\u7684edge coverage insrumentation\u5728\u901a\u8fc7\u8fd9\u6761\u8def\u5f84\u7684\u65f6\u5019\u5df2\u7ecf\u5956\u52b1\u4e86fuzzer\uff0c\u6240\u4ee5\u5bf9\u4e8e\u8fd9\u79cd\u7684\u6570\u636e\u6d41\u672c\u6587\u9009\u62e9\u4e0d\u8ddf\u8e2a\u4e14\u4eceDDG\u4e2d\u4e22\u6389\u3002<\/li>\n\n\n\n<li>\u53e6\u4e00\u79cd\u5219\u662f\u4e00\u4e2a\u53d8\u91cf\u7684\u4f7f\u7528U\u53d6\u51b3\u4e8e\u591a\u4e2a\u5b9a\u4e49\uff08More than\uff09\uff0c\u6bd4\u5982 <a href=\"https:\/\/www.notion.so\/22-9-Notes-80528824dcee4661953b040c9dddc48d\">\u03c6-node variable<\/a>\u3002\u7528\u4e0b\u56fe\u4e3e\u4f8b\uff0c\u9ed1\u7ebf\u8868\u793aCFG\u4e2d\u7684edge\uff0c\u84dd\u7ebf\u4e3aDDG\u7684edge\u3002\u8fd9\u65f6fuzzer\u8fbe\u5230100%\u7684edge coverage\u4f46\u662f\u4e24\u4e2adef-use\u5bf9\u4e2d\u53ea\u6709\u4e00\u4e2a\u4f1a\u88ab\u89e6\u53d1\u3002\u8fd9\u91cc\u7684\u539f\u56e0\u662f\u8bb0\u5f55edge coverage\u7684\u673a\u5236\uff0c\u6bd4\u5982\u5c06\u73b0\u5728\u7684\u548c\u4e4b\u524d\u7684BB\u7684\u5f02\u6216\uff08XOR\uff09\uff0c\u6240\u4ee5\u6267\u884cexecution\u603b\u662f\u7528\u540c\u4e00\u6761\u8def\u5f84\u5230\u8fbeuse\uff0cfuzzer\u4e5f\u4e0d\u4f1a\u5c06\u8fd9\u4e24\u6761\u8def\u5f53\u505a\u4e24\u4e2a\u5355\u72ec\u7684\u53d1\u73b0\u3002\u6240\u4ee5\u672c\u6587\u51b3\u5b9a\u552f\u4e00\u4fdd\u7559\u8fd9\u79cd\u7c7b\u578b\u7684\u6570\u636e\u6d41\u3002<\/li>\n<\/ol>\n<\/li>\n<\/ol>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/43.142.23.155\/wp-content\/uploads\/2023\/01\/image-2.png\" alt=\"\" class=\"wp-image-1782\" width=\"402\" height=\"245\" srcset=\"http:\/\/43.142.23.155\/wp-content\/uploads\/2023\/01\/image-2.png 525w, http:\/\/43.142.23.155\/wp-content\/uploads\/2023\/01\/image-2-300x183.png 300w\" sizes=\"auto, (max-width: 402px) 100vw, 402px\" \/><\/figure>\n<\/div>\n\n\n<p>\u8fc7\u6ee4\u540e\u7684DDG\u79f0\u4e3a$DDG_{filter}$\uff0c\u5728\u8fd9\u4e2a\u56fe\u4e2d\uff0c\u53ea\u5305\u542bdef-use\u5173\u7cfb\u7684flows\uff0c\u4e14\u5bf9\u4e8e\u540c\u4e00\u4e2a\u53d8\u91cf\u7684use\u5e94\u8be5\u81f3\u5c11\u6709\u4e24\u4e2adef\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">2.3 DDFuzz\u7684\u63d2\u6869 Instrumentation<\/h3>\n\n\n\n<p>\u5982\u4e0a\u8282\u6240\u8bf4\uff0c\u57fa\u4e8eAFL\u7684Fuzzer\u5f80\u5f80\u901a\u8fc7\u8ba1\u7b97\u5f53\u524d\u548c\u4e4b\u524d\u4f4d\u7f6e\u7684IDs\u7684\u5f02\u6216\u503cXOR\u8bb0\u5f55\u4e00\u4e2aedge visit\uff0c\u8be5\u5f02\u6216\u503c\u8fd8\u88ab\u7528\u4f5c\u4e00\u4e2aindex\u7d22\u5f15\u4ee5\u8bbf\u95ee\u4e00\u4e2a\u5b58\u50a8\u7740\u67d0\u4e00\u4e2aedge\u88abhit\u7684\u6b21\u6570\u7684bitmap\uff0c\u8fd9\u79cd\u65b9\u5f0f\u88ab\u4fdd\u7559\u4e0b\u6765\u7ee7\u7eed\u4f7f\u7528\u3002<\/p>\n\n\n\n<p>\u4f46\u662f\u5728DDG\u4e2d\u8fd9\u4e2a\u65b9\u5f0f\u5e76\u4e0d\u9002\u7528\uff0c\u56e0\u4e3aXOR\u4e2d\u7684\u4e24\u4e2a\u8f93\u5165\u7684\u4f4d\u7f6e\u5e76\u4e0d\u8fde\u7eed\uff0c\u4e14\u6267\u884c\u5728\u5230\u8fbe\u6570\u636e\u4f9d\u8d56\u7684use\u65f6\u4f1a\u7ecf\u8fc7\u591a\u4e2abb\u3002\u672c\u6587\u4e3a\u89e3\u51b3\u8fd9\u4e2a\u95ee\u9898\uff0c\u7ed9\u6bcf\u4e2a\u5305\u542b\u53ef\u80fd\u88abtrack\u7684def\u7684bb\u90fd\u8bbe\u7f6e\u4e86\u4e00\u4e2a\u989d\u5916\u7684\u53d8\u91cf\uff0c\u5f00\u59cb\u4e3a0\u3002\u5f53reach\u5230\u8fd9\u4e2abb\uff0cinstrumentation\u4f1a\u5c06\u8fd9\u4e2amarker value\u6539\u4e3abb\u7684ID\u3002\u6700\u540e\uff0c\u901a\u8fc7\u751f\u6210\u4e00\u4e2a\u65b0\u7684\u4f4d\u56fe\u7d22\u5f15\uff0c\u7528\u76ee\u6807\u5757\u7684ID\u8868\u793a\u76f8\u5e94\u7684marker value\u3002\u7531\u4e8e$N\u22950 = N$\uff0c\u7ed3\u679c\u5c06\u53ea\u8003\u8651\u5b9e\u9645\u6267\u884c\u7684\u5b9a\u4e49\uff0c\u56e0\u6b64\u5f53\u901a\u8fc7\u4e0d\u540c\u7684\u6570\u636e\u6d41\u8def\u5f84\u5230\u8fbe\u76f8\u540c\u7684\u57fa\u672c\u5757\u65f6\uff0c\u4f1a\u4ea7\u751f\u4e0d\u540c\u7684\u503c\u3002<\/p>\n\n\n\n<p>\u4e3e\u4e2a\u4f8b\u5b50\u5427\uff0c\u592a\u62bd\u8c61\u4e86\u8fd9\u4e2a\u4e1c\u897f\uff1a\u9ad8\u4eae\u4e3aIR\u7ea7\u522b\u63d2\u6869\u4ee3\u7801\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"810\" height=\"859\" src=\"http:\/\/43.142.23.155\/wp-content\/uploads\/2023\/01\/image-3.png\" alt=\"\" class=\"wp-image-1783\" srcset=\"http:\/\/43.142.23.155\/wp-content\/uploads\/2023\/01\/image-3.png 810w, http:\/\/43.142.23.155\/wp-content\/uploads\/2023\/01\/image-3-283x300.png 283w, http:\/\/43.142.23.155\/wp-content\/uploads\/2023\/01\/image-3-768x814.png 768w, http:\/\/43.142.23.155\/wp-content\/uploads\/2023\/01\/image-3-670x711.png 670w\" sizes=\"auto, (max-width: 810px) 100vw, 810px\" \/><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">3. \u8bc4\u4f30 Evaluation<\/h2>\n\n\n\n<p>\u8be5\u90e8\u5206\u4e5f\u5e94\u8be5\u4f5c\u4e3a\u9605\u8bfb\u7684\u91cd\u70b9\uff0c\u751a\u81f3\u8bf4\u597d\u7684\u8bba\u6587\u6ca1\u6709\u5e9f\u8bdd\uff0c\u5c24\u5176\u5bf9\u6211\u8fd9\u79cd\u521a\u5165\u95e8fuzz\u7684\u6765\u8bf4\u3002\u6211\u9700\u8981\u5c3d\u53ef\u80fd\u7684\u4e86\u89e3\u4e1a\u5185\u5e38\u7528\u7684\u8bc4\u4f30\u6807\u51c6\u3001\u5de5\u5177\u3001\u6570\u636e\u96c6\u8fd8\u6709\u4e00\u4e9b\u57fa\u7840\u7684\u5e38\u8bc6\u77e5\u8bc6\u3002<\/p>\n\n\n\n<p>\u4f7f\u7528\u4e863\u4e2adataset\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>dataset1 \u662f10\u4e2a\u5305\u542b\u6f0f\u6d1e\u7684\u771f\u5b9e\u7684\u5f00\u6e90\u9879\u76ee\u7684\u65e7\u7248\u672c\uff0c\u800c\u4e14\u5c06\u5206\u4e3a\u4e24\u7ec4\uff1a\u6839\u636e\u7ecf\u9a8c\u5206\u4e3a\u5f3a\u6570\u636e\u4f9d\u8d56\u578b\u548c\u5f31\u6570\u636e\u4f9d\u8d56\u578b\uff0c\u4e3a\u4e0d\u540c\u7c7b\u578b\u4e0d\u540c\u503e\u5411\u7684\u4ee3\u7801\u96c6\u5408\u3002<\/li>\n\n\n\n<li>dataset2 \u91c7\u7528\u4e86Fuzzbench\uff0c\u56e0\u4e3a\u6709\u5f88\u591abug\u4e14\u5e94\u7528\u5f88\u591a\uff0c\u7a0b\u5e8f\u91cf\u4e5f\u5f88\u5927\u3002\u4e00\u5171\u670922\u4e2a\u4e0d\u540c\u7684\u7a0b\u5e8f\u3002 \u7ade\u54c1\uff1aLAVA-M\uff1bMAGMA\uff1b<\/li>\n\n\n\n<li>dataset3 \u6e90\u81ea\u4e00\u4e2a\u8f83\u65b0\u7684\u8bba\u6587\uff0c\u67096\u4e2a\u5e94\u7528\u7a0b\u5e8f\u3002\u4f20\u9001\u95e8\uff1aTim Blazytko, Cornelius Aschermann, Moritz Schl\u00a8ogel, Ali Abbasi, Sergej Schumilo, Simon W\u00a8orner, and Thorsten Holz. GRIMOIRE: Synthesizing structure while fuzzing. In 28th USENIX Security Symposium (USENIX Security 19), pages 1985\u20132002. USENIX Association, August 2019.<\/li>\n<\/ol>\n\n\n\n<h3 class=\"wp-block-heading\">3.1 \u5b9e\u9a8c\u7ed3\u679c dataset1<\/h3>\n\n\n\n<p><em><strong>\u6548\u679c\u5bf9\u6bd4\uff08\u5f3a\u5f31\u6570\u636e\u7c7b\u578b\uff09\uff1a<\/strong><\/em><\/p>\n\n\n\n<p>\u9996\u5148\u662f\u9488\u5bf9\u6027\u5730\u9009\u53d6\u4e86\u768410 \u4e2a\u9879\u76ee\uff0c\u901a\u8fc7\u7f16\u7a0b\u7ecf\u9a8c\u5c06\u5b83\u4eec\u5206\u4e3a\u5f3a\u6570\u636e\u4f9d\u8d56\u578b\uff08\u4e0a\uff09\u548c\u5f31\u6570\u636e\u4f9d\u8d56\u578b\uff08\u4e0b\uff09\u4e24\u7c7b\uff0c\u5982 Table1\u6240\u793a<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"334\" src=\"http:\/\/43.142.23.155\/wp-content\/uploads\/2023\/01\/image-4-1024x334.png\" alt=\"\" class=\"wp-image-1784\" srcset=\"http:\/\/43.142.23.155\/wp-content\/uploads\/2023\/01\/image-4-1024x334.png 1024w, http:\/\/43.142.23.155\/wp-content\/uploads\/2023\/01\/image-4-300x98.png 300w, http:\/\/43.142.23.155\/wp-content\/uploads\/2023\/01\/image-4-768x251.png 768w, http:\/\/43.142.23.155\/wp-content\/uploads\/2023\/01\/image-4-1536x502.png 1536w, http:\/\/43.142.23.155\/wp-content\/uploads\/2023\/01\/image-4-670x219.png 670w, http:\/\/43.142.23.155\/wp-content\/uploads\/2023\/01\/image-4.png 1540w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p>\u4f5c\u8005\u4f7f\u7528\u4e86 AFL++ \u8fdb\u884c\u4e86\u5bf9\u6bd4\u5b9e\u9a8c\u3002\u9996\u5148\uff0c\u4f5c\u8005\u8ba1\u7b97\u4e86\u88ab\u63d2\u6869\u7684\u57fa\u672c\u5757\u5360\u6240\u6709\u57fa\u672c\u5757\u7684\u6bd4\u4f8b\uff08\u5373<strong>DD ratio<\/strong>\uff09\u8fd9\u4e00\u53c2\u6570\uff0c\u7528\u6570\u636e\u8bc1\u660e\u4e86\u4ed6\u4eec\u533a\u5206\u4e24\u7c7b\u9879\u76ee\u7684\u5408\u7406\u6027\u3002<\/p>\n\n\n\n<p>\u4ece TABLE 2 \u4e2d\u53ef\u4ee5\u770b\u51fa\uff0c\u5728\u5f3a\u6570\u636e\u4f9d\u8d56\u578b\u9879\u76ee\u7684\u6f0f\u6d1e\u68c0\u6d4b\u4e0a\uff0cDDFuzz \u6bd4\u4f20\u7edf\u7684\u8986\u76d6\u7387\u5bfc\u5411\u7684 Fuzzer \uff08<strong>Edge<\/strong>\uff09\u8868\u73b0\u66f4\u597d\u3002\u8fdb\u4e00\u6b65\uff0c\u5bf9\u4e24\u79cd Fuzzer \u68c0\u6d4b\u51fa\u7684\u6f0f\u6d1e\u8fdb\u884c\u53bb\u91cd\u548c\u5bf9\u6bd4\uff0c\u4f5c\u8005\u53d1\u73b0 DDFuzz \u8fd8\u80fd\u68c0\u6d4b\u51fa\u5f88\u591a\u4e4b\u524d\u53d1\u73b0\u4e0d\u4e86\u7684\u6f0f\u6d1e\u3002\u4f46\u5728\u5f31\u6570\u636e\u4f9d\u8d56\u578b\u9879\u76ee\u4e0a\uff0cDDFuzz \u5219\u8868\u73b0\u6b20\u4f73\u3002<\/p>\n\n\n\n<p>\u4e4b\u540e\uff0c\u4f5c\u8005\u901a\u8fc7\u8ba1\u7b97<a href=\"https:\/\/www.notion.so\/Mann-Whitney-U-test-5821397a7fa84078aa3ea438017e836e\">Mann-Whitney U test\uff08\u66fc-\u60e0\u7279\u5c3cU\u68c0\u9a8c\/\u66fc-\u60e0\u7279\u5c3c\u79e9\u548c\u68c0\u9a8c\uff09<\/a>\u4e2d\u7684 P-value \uff0c\u7edf\u8ba1\u5206\u6790\u5e76\u8bc1\u660e\u4e86\uff0cDDFuzz \u7684\u8868\u73b0\u53d7\u9879\u76ee\u672c\u8eab\u6570\u636e\u4f9d\u8d56\u5173\u7cfb\u7684\u5f71\u54cd\u5f88\u5927\uff0c\u5f53\u5206\u6790\u9879\u76ee\u4e3a\u5f31\u4f9d\u8d56\u578b\u65f6\uff0cDDFuzz \u548c AFL++ \u5dee\u522b\u4e0d\u5927\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"449\" src=\"http:\/\/43.142.23.155\/wp-content\/uploads\/2023\/01\/image-5-1024x449.png\" alt=\"\" class=\"wp-image-1785\" srcset=\"http:\/\/43.142.23.155\/wp-content\/uploads\/2023\/01\/image-5-1024x449.png 1024w, http:\/\/43.142.23.155\/wp-content\/uploads\/2023\/01\/image-5-300x132.png 300w, http:\/\/43.142.23.155\/wp-content\/uploads\/2023\/01\/image-5-768x337.png 768w, http:\/\/43.142.23.155\/wp-content\/uploads\/2023\/01\/image-5-1536x674.png 1536w, http:\/\/43.142.23.155\/wp-content\/uploads\/2023\/01\/image-5-670x294.png 670w, http:\/\/43.142.23.155\/wp-content\/uploads\/2023\/01\/image-5.png 1546w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p><em><strong>\u6027\u80fd\u5f00\u9500\u7684\u5206\u6790\uff1a<\/strong><\/em><\/p>\n\n\n\n<p>\u4f5c\u8005\u4e3b\u8981\u5173\u6ce8\u5176\u4f9d\u8d56\u5173\u7cfb\u8fc7\u6ee4\u7b56\u7565\u7684\u6709\u6548\u6027\uff0c\u5c06 DDFuzz \u4f7f\u7528\u7684 DDG \u4e0e\u7531 LLVM \u751f\u6210\u7684 DDG \u548c\u8fc7\u6ee4\u4e4b\u524d\u7684 DDG \u8fdb\u884c\u5bf9\u6bd4\u3002\u4f5c\u8005\u53d1\u73b0\u5176\u4ed6\u4e24\u7c7b DDG \u7531\u4e8e\u5176\u5f00\u9500\u8fc7\u5927\uff0c\u5f88\u5bb9\u6613\u89e6\u53d1 AFL++ \u7684\u8d85\u65f6\u673a\u5236\uff0c\u800c\u7ecf\u8fc7\u526a\u679d\uff08\u8fc7\u6ee4\uff09\u540e\u7684 DDG \u964d\u4f4e\u4e86\u63d2\u6869\u6570\u91cf\uff0c\u4ece\u800c\u63d0\u9ad8\u4e86\u7a0b\u5e8f\u7684\u6267\u884c\u901f\u5ea6\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"832\" height=\"449\" src=\"http:\/\/43.142.23.155\/wp-content\/uploads\/2023\/01\/image-6.png\" alt=\"\" class=\"wp-image-1786\" srcset=\"http:\/\/43.142.23.155\/wp-content\/uploads\/2023\/01\/image-6.png 832w, http:\/\/43.142.23.155\/wp-content\/uploads\/2023\/01\/image-6-300x162.png 300w, http:\/\/43.142.23.155\/wp-content\/uploads\/2023\/01\/image-6-768x414.png 768w, http:\/\/43.142.23.155\/wp-content\/uploads\/2023\/01\/image-6-670x362.png 670w\" sizes=\"auto, (max-width: 832px) 100vw, 832px\" \/><\/figure>\n\n\n\n<p><em><strong>\u63d2\u6869\u65b9\u5f0f\u5bf9\u6bd4\uff1a<\/strong><\/em><\/p>\n\n\n\n<p>\u6b64\u5916\uff0c\u4f5c\u8005\u8fd8\u5c06 DDFuzz \u4f7f\u7528\u7684\u63d2\u6869\u65b9\u5f0f\u548c\u5176\u4ed6\u63d2\u6869\u65b9\u5f0f\uff08Ngram2\uff0cNgram4 \u548c Ctx\uff09\u5728\u6f0f\u6d1e\u68c0\u6d4b\u548c\u4ee3\u7801\u8986\u76d6\u7387\u4e0a\u7684\u8868\u73b0\u8fdb\u884c\u4e86\u5bf9\u6bd4\u3002\u4f5c\u8005\u53d1\u73b0\uff0c\u5c3d\u7ba1\u4e0d\u5b58\u5728\u67d0\u4e2a\u68c0\u6d4b\u6f0f\u6d1e\u6700\u591a\u7684\u63d2\u6869\u65b9\u5f0f\uff0c\u4f46 DDFuzz \u7684\u4f18\u52bf\u5728\u4e8e\u53d1\u73b0\u4e0d\u540c\u7684\u6f0f\u6d1e\u3002\u800c\u5728\u4ee3\u7801\u8986\u76d6\u7387\u4e0a\uff0cDDFuzz \u5219\u8868\u73b0\u4e00\u822c\uff0c\u53ea\u53d6\u5f97\u4e86\u6bd4 AFL++ \u66f4\u597d\u7684\u7ed3\u679c\uff0c\u4f46\u8fd9\u548c\u4f5c\u8005\u8bbe\u8ba1 DDFuzz \u7684\u9884\u671f\u4e5f\u662f\u7b26\u5408\u7684\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"270\" src=\"http:\/\/43.142.23.155\/wp-content\/uploads\/2023\/01\/image-7-1024x270.png\" alt=\"\" class=\"wp-image-1787\" srcset=\"http:\/\/43.142.23.155\/wp-content\/uploads\/2023\/01\/image-7-1024x270.png 1024w, http:\/\/43.142.23.155\/wp-content\/uploads\/2023\/01\/image-7-300x79.png 300w, http:\/\/43.142.23.155\/wp-content\/uploads\/2023\/01\/image-7-768x203.png 768w, http:\/\/43.142.23.155\/wp-content\/uploads\/2023\/01\/image-7-1536x406.png 1536w, http:\/\/43.142.23.155\/wp-content\/uploads\/2023\/01\/image-7-670x177.png 670w, http:\/\/43.142.23.155\/wp-content\/uploads\/2023\/01\/image-7.png 1568w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"251\" src=\"http:\/\/43.142.23.155\/wp-content\/uploads\/2023\/01\/image-8-1024x251.png\" alt=\"\" class=\"wp-image-1788\" srcset=\"http:\/\/43.142.23.155\/wp-content\/uploads\/2023\/01\/image-8-1024x251.png 1024w, http:\/\/43.142.23.155\/wp-content\/uploads\/2023\/01\/image-8-300x73.png 300w, http:\/\/43.142.23.155\/wp-content\/uploads\/2023\/01\/image-8-768x188.png 768w, http:\/\/43.142.23.155\/wp-content\/uploads\/2023\/01\/image-8-670x164.png 670w, http:\/\/43.142.23.155\/wp-content\/uploads\/2023\/01\/image-8.png 1259w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\">3.2 \u5b9e\u9a8c\u7ed3\u679cdataset2 &#8211; FuzzBench<\/h3>\n\n\n\n<p>\u4f5c\u8005\u968f\u540e\u5c06 DDFuzz \u548c AFL++ \u90fd\u653e\u5230\u4e86 FuzzBench \u4e0a\u8fdb\u884c\u6d4b\u8bd5\uff0c\u53d1\u73b0 DDFuzz \u53ea\u6709\u5728\u53d1\u73b0\u6f0f\u6d1e\u6570\u76ee\u7684\u51e0\u4f55\u5e73\u5747\uff08Geomean\uff09\u6570\u4e0a\u8868\u73b0\u5f97\u66f4\u597d\uff0c\u4ece\u6574\u4f53\u53d1\u73b0\u7684\u6f0f\u6d1e\u6570\u76ee\u6765\u770b\u5219\u900a\u4e8e AFL++ \u3002\u4f46\u5177\u4f53\u5230\u67d0\u4e2a\u9879\u76ee\u4e0a\uff0c\u4f5c\u8005\u4ecd\u7136\u8bc1\u660e\u4e86 DDFuzz \u5177\u6709\u53d1\u73b0\u4e0d\u540c\u6f0f\u6d1e\u7684\u4f18\u52bf\u3002\u540c\u65f6\uff0c\u4f5c\u8005\u8fd8\u624b\u52a8\u7edf\u8ba1\u4e86\u8fd9\u4e9b\u9879\u76ee\u7684 DD ratio\uff0c\u9a8c\u8bc1\u4e86\u5176\u4f5c\u4e3a\u533a\u5206\u5f3a\/\u5f31\u6570\u636e\u4f9d\u8d56\u578b\u9879\u76ee\u6807\u51c6\u7684\u5408\u7406\u6027\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"611\" src=\"http:\/\/43.142.23.155\/wp-content\/uploads\/2023\/01\/image-9-1024x611.png\" alt=\"\" class=\"wp-image-1789\" srcset=\"http:\/\/43.142.23.155\/wp-content\/uploads\/2023\/01\/image-9-1024x611.png 1024w, http:\/\/43.142.23.155\/wp-content\/uploads\/2023\/01\/image-9-300x179.png 300w, http:\/\/43.142.23.155\/wp-content\/uploads\/2023\/01\/image-9-768x458.png 768w, http:\/\/43.142.23.155\/wp-content\/uploads\/2023\/01\/image-9-670x400.png 670w, http:\/\/43.142.23.155\/wp-content\/uploads\/2023\/01\/image-9.png 1263w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p>\u6700\u540e\uff0c\u4f5c\u8005\u5bf9 DDFuzz \u6316\u6398\u51fa\u7684<em><strong>\u6f0f\u6d1e\u7c7b\u578b\u8fdb\u884c\u4e86\u5206\u6790<\/strong><\/em>\uff1a<\/p>\n\n\n\n<p>\u76f8\u6bd4\u4e8e\u53ea\u4f7f\u7528 AFL++\uff0cDDFuzz \u66f4\u5bb9\u6613\u53d1\u73b0\u7f13\u51b2\u533a\u6ea2\u51fa\u7c7b\u6f0f\u6d1e\uff0c\u5982\u4e0b\u8868\uff1a<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"632\" height=\"361\" src=\"http:\/\/43.142.23.155\/wp-content\/uploads\/2023\/01\/image-10.png\" alt=\"\" class=\"wp-image-1790\" srcset=\"http:\/\/43.142.23.155\/wp-content\/uploads\/2023\/01\/image-10.png 632w, http:\/\/43.142.23.155\/wp-content\/uploads\/2023\/01\/image-10-300x171.png 300w\" sizes=\"auto, (max-width: 632px) 100vw, 632px\" \/><\/figure>\n<\/div>\n\n\n<p>\u4f5c\u8005\u8fd8\u7edf\u8ba1\u4e86\u5173\u4e8e\u6570\u636e\u96c6\u4e09\u7684\u7ed3\u679c\uff0c\u5e76\u62bd\u53d6\u4e86 tcc \u4e2d\u7684\u4e00\u4e2a\u6f0f\u6d1e\u4f5c\u4e3a\u6837\u4f8b\u5206\u6790<\/p>\n\n\n\n<p><em><strong>Final\uff1a<\/strong><\/em><\/p>\n\n\n\n<p>Q\uff1a<a href=\"https:\/\/www.notion.so\/Euro-S-P-2022-DDFuzz-Fuzzing-with-Data-Dependency-Information-762e359927d041028b804facedb153fe\">\u57fa\u4e8eAFL\u7684Fuzzer\u5f80\u5f80\u901a\u8fc7\u8ba1\u7b97\u5f53\u524d\u548c\u4e4b\u524d\u4f4d\u7f6e\u7684IDs\u7684\u5f02\u6216\u503cXOR\u8bb0\u5f55\u4e00\u4e2aedge visit<\/a>\u6211\u81ea\u5df1\u770bAFL\u7684\u6642\u5019\u600e\u9ebd\u6c92\u6ce8\u610f\uff1f<\/p>\n","protected":false},"excerpt":{"rendered":"<p>The LLVM framework applies some optimizations to construct its internal Dependence Graph [5], such a&#46;&#46;&#46;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[63],"tags":[72,74,73,75],"class_list":["post-1777","post","type-post","status-publish","format-standard","hentry","category-software-system-security","tag-fuzz","tag-74","tag-73","tag-75"],"_links":{"self":[{"href":"http:\/\/43.142.23.155\/index.php?rest_route=\/wp\/v2\/posts\/1777","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/43.142.23.155\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/43.142.23.155\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/43.142.23.155\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/43.142.23.155\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1777"}],"version-history":[{"count":2,"href":"http:\/\/43.142.23.155\/index.php?rest_route=\/wp\/v2\/posts\/1777\/revisions"}],"predecessor-version":[{"id":1791,"href":"http:\/\/43.142.23.155\/index.php?rest_route=\/wp\/v2\/posts\/1777\/revisions\/1791"}],"wp:attachment":[{"href":"http:\/\/43.142.23.155\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1777"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/43.142.23.155\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1777"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/43.142.23.155\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1777"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}