{"id":206,"date":"2024-08-11T01:20:30","date_gmt":"2024-08-10T17:20:30","guid":{"rendered":"http:\/\/39.104.51.85\/?p=206"},"modified":"2024-08-11T01:23:08","modified_gmt":"2024-08-10T17:23:08","slug":"largebin-attack%e5%ad%a6%e4%b9%a0","status":"publish","type":"post","link":"http:\/\/39.104.51.85\/index.php\/2024\/08\/11\/largebin-attack%e5%ad%a6%e4%b9%a0\/","title":{"rendered":"largebin attack\u5b66\u4e60"},"content":{"rendered":"\n<p>\u60f3\u8bfb\u6e90\u7801\u53ef\u4ee5\u770b\u770b<a href=\"https:\/\/xz.aliyun.com\/t\/15191?time__1311=GqjxuQi%3DKCqxlxGgx%2Bhxm27%2BEM1DiqHpD#toc-5\">\u8fd9\u91cc<\/a><\/p>\n\n\n\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_69_1 counter-hierarchy ez-toc-counter ez-toc-custom ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title \" >\u5185\u5bb9<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"http:\/\/39.104.51.85\/index.php\/2024\/08\/11\/largebin-attack%e5%ad%a6%e4%b9%a0\/#%E8%BE%BE%E5%88%B0%E7%9A%84%E6%95%88%E6%9E%9C\" title=\"\u8fbe\u5230\u7684\u6548\u679c\">\u8fbe\u5230\u7684\u6548\u679c<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"http:\/\/39.104.51.85\/index.php\/2024\/08\/11\/largebin-attack%e5%ad%a6%e4%b9%a0\/#%E5%88%A9%E7%94%A8%E6%9D%A1%E4%BB%B6\" title=\"\u5229\u7528\u6761\u4ef6\">\u5229\u7528\u6761\u4ef6<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"http:\/\/39.104.51.85\/index.php\/2024\/08\/11\/largebin-attack%e5%ad%a6%e4%b9%a0\/#largebin%E7%9A%84%E7%BB%93%E6%9E%84\" title=\"largebin\u7684\u7ed3\u6784\">largebin\u7684\u7ed3\u6784<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"http:\/\/39.104.51.85\/index.php\/2024\/08\/11\/largebin-attack%e5%ad%a6%e4%b9%a0\/#largebin%E7%9A%84%E6%8F%92%E5%85%A5\" title=\"largebin\u7684\u63d2\u5165\">largebin\u7684\u63d2\u5165<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"http:\/\/39.104.51.85\/index.php\/2024\/08\/11\/largebin-attack%e5%ad%a6%e4%b9%a0\/#largebin%E7%9A%84%E5%8F%96%E5%87%BA\" title=\"largebin\u7684\u53d6\u51fa\">largebin\u7684\u53d6\u51fa<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"http:\/\/39.104.51.85\/index.php\/2024\/08\/11\/largebin-attack%e5%ad%a6%e4%b9%a0\/#largebin-attack\" title=\"largebin attack\">largebin attack<\/a><ul class='ez-toc-list-level-4' ><li class='ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"http:\/\/39.104.51.85\/index.php\/2024\/08\/11\/largebin-attack%e5%ad%a6%e4%b9%a0\/#%E5%8F%96%E5%87%BA%E6%97%B6attack\" title=\"\u53d6\u51fa\u65f6attack\">\u53d6\u51fa\u65f6attack<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"http:\/\/39.104.51.85\/index.php\/2024\/08\/11\/largebin-attack%e5%ad%a6%e4%b9%a0\/#%E6%8F%92%E5%85%A5%E6%97%B6attack\" title=\"\u63d2\u5165\u65f6attack\">\u63d2\u5165\u65f6attack<\/a><ul class='ez-toc-list-level-5' ><li class='ez-toc-heading-level-5'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"http:\/\/39.104.51.85\/index.php\/2024\/08\/11\/largebin-attack%e5%ad%a6%e4%b9%a0\/#230%E4%BB%A5%E5%89%8D\" title=\"2.30\u4ee5\u524d\">2.30\u4ee5\u524d<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-5'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"http:\/\/39.104.51.85\/index.php\/2024\/08\/11\/largebin-attack%e5%ad%a6%e4%b9%a0\/#230%E4%BB%A5%E5%90%8E\" title=\"2.30\u4ee5\u540e\">2.30\u4ee5\u540e<\/a><\/li><\/ul><\/li><\/ul><\/li><\/ul><\/nav><\/div>\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%E8%BE%BE%E5%88%B0%E7%9A%84%E6%95%88%E6%9E%9C\"><\/span>\u8fbe\u5230\u7684\u6548\u679c<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>2.30\u4e4b\u524d\u53ef\u4ee5\u5f80\u4efb\u610f\u4e24\u4e2a\u5730\u5740\u5199\u4e00\u4e2a\u5806\u5730\u5740\uff0c2.30\u4e4b\u540e\u53ea\u80fd\u5f80\u4e00\u4e2a\u4efb\u610f\u5730\u5740\u5199\u5806\u5730\u5740<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%E5%88%A9%E7%94%A8%E6%9D%A1%E4%BB%B6\"><\/span>\u5229\u7528\u6761\u4ef6<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>\u5b58\u5728UAF\uff0c\u53ef\u4ee5\u4fee\u6539largebin\u7684\u5185\u5bb9<\/p>\n\n\n\n<p>\u4e24\u6b21\u7533\u8bf7\u7684largebin\u5927\u5c0f\u4e0d\u80fd\u76f8\u540c<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"largebin%E7%9A%84%E7%BB%93%E6%9E%84\"><\/span>largebin\u7684\u7ed3\u6784<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>\u8981\u77e5\u9053\u7b2c\u4e00\u70b9\uff0c\u5728largebin\u91cc\uff0c\u51e0\u4e2a\u5927\u5c0f\u76f8\u8fd1\u7684chunk\u4f1a\u7528\u4e00\u4e2a\u6307\u9488\u8fdb\u884c\u7ef4\u62a4\uff0c\u901a\u5e38\u5176\u5b58\u653e\u5927\u5c0f\u5927\u4e8e0x400\u7684\u5806\u5757\uff0c\u4e0d\u8fc7\u4e00\u822c\u7533\u8bf70x420\u4ee5\u4e0a\u7684\u5806\u5757\uff0c\u56e0\u4e3a\u4f4e\u7248\u672c0x400\u53ef\u80fd\u4f1a\u88ab\u653e\u5230tcache\u91cc<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='http:\/\/39.104.51.85\/wp-content\/uploads\/2024\/08\/image-4-1024x488.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  decoding=\"async\" width=\"1024\" height=\"488\" data-original=\"http:\/\/39.104.51.85\/wp-content\/uploads\/2024\/08\/image-4-1024x488.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" class=\"wp-image-208\"  sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/div><\/figure>\n\n\n\n<figure class=\"wp-block-image size-full\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='http:\/\/39.104.51.85\/wp-content\/uploads\/2024\/08\/image-6.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  decoding=\"async\" width=\"448\" height=\"759\" data-original=\"http:\/\/39.104.51.85\/wp-content\/uploads\/2024\/08\/image-6.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" class=\"wp-image-210\"  sizes=\"(max-width: 448px) 100vw, 448px\" \/><\/div><\/figure>\n\n\n\n<figure class=\"wp-block-image size-large\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='http:\/\/39.104.51.85\/wp-content\/uploads\/2024\/08\/image-5-1024x55.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  decoding=\"async\" width=\"1024\" height=\"55\" data-original=\"http:\/\/39.104.51.85\/wp-content\/uploads\/2024\/08\/image-5-1024x55.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" class=\"wp-image-209\"  sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/div><\/figure>\n\n\n\n<p>\u5728largebin\u91cc\uff0c\u9664\u4e86\u539f\u5148\u7684\u5806\u5757\u7ed3\u6784\uff0c\u8fd8\u65b0\u589e\u4e86fd_nextsize\u548cbk_nextsize\u4e24\u4e2a\u6307\u9488\uff0c\u524d\u8005\u6307\u5411\u6bd4\u5f53\u524d\u5806\u5757\u5c0f\u7684\u6700\u5927chunk\uff0c\u540e\u8005\u6307\u5411\u6bd4\u5f53\u524d\u5806\u5757\u5927\u7684\u6700\u5c0fchunk<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='http:\/\/39.104.51.85\/wp-content\/uploads\/2024\/08\/image-3.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  decoding=\"async\" width=\"294\" height=\"84\" data-original=\"http:\/\/39.104.51.85\/wp-content\/uploads\/2024\/08\/image-3.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" class=\"wp-image-207\"\/><\/div><\/figure>\n\n\n\n<p>\u5bf9\u4e8e\u5bf9\u5e94\u540c\u4e00\u4e2aindex\u7684\u4e00\u5806chunk\uff0c\u6309\u7167\u4ee5\u4e0b\u89c4\u5219\u6392\u5e8f\uff1a<\/p>\n\n\n\n<p>1.\u5927\u5806\u5757\u9760\u524d\uff0c\u5c0f\u5806\u5757\u9760\u540e<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='http:\/\/39.104.51.85\/wp-content\/uploads\/2024\/08\/image-7.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  decoding=\"async\" width=\"650\" height=\"60\" data-original=\"http:\/\/39.104.51.85\/wp-content\/uploads\/2024\/08\/image-7.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" class=\"wp-image-211\"  sizes=\"(max-width: 650px) 100vw, 650px\" \/><\/div><\/figure>\n\n\n\n<p>2.\u5bf9\u4e8e\u76f8\u540c\u5927\u5c0f\u7684\u5806\u5757\uff0c\u6700\u5148\u91ca\u653e\u7684\u5806\u5757\u4f1a\u6210\u4e3a\u5806\u5934\uff0c\u5176<code>fd_nextsize<\/code>\u4e0e<code>bk_nextsize<\/code>\u4f1a\u88ab\u8d4b\u503c\uff0c\u5176\u4f59\u7684\u5806\u5757\u91ca\u653e\u540e\u90fd\u4f1a\u63d2\u5165\u5230\u8be5\u5806\u5934\u7ed3\u70b9\u7684\u4e0b\u4e00\u4e2a\u7ed3\u70b9\uff0c\u901a\u8fc7<code>fd<\/code>\u4e0e<code>bk<\/code>\u94fe\u63a5\uff0c\u5f62\u6210\u4e86\u5148\u91ca\u653e\u7684\u5728\u94fe\u8868\u540e\u9762\u7684\u6392\u5e8f\u65b9\u5f0f\uff0c\u4e14\u5176<code>fd_nextsize<\/code>\u4e0e<code>bk_nextsize<\/code>\u90fd\u4e3a0\u3002<\/p>\n\n\n\n<p>3.\u4e0d\u540c\u5927\u5c0f\u7684\u5806\u5757\u901a\u8fc7\u5806\u5934\u4e32\u8054\uff0c\u5373\u5806\u5934\u4e2d<code>fd_nextsize<\/code>\u6307\u5411\u6bd4\u5b83\u5c0f\u7684\u5806\u5757\u7684\u5806\u5934\uff0c<code>bk_nextsize<\/code>\u6307\u5411\u6bd4\u5b83\u5927\u7684\u5806\u5757\u7684\u5806\u5934\uff0c\u4ece\u800c\u5f62\u6210\u4e86\u7b2c\u4e00\u70b9\u4e2d\u7684\u4ece\u5927\u5230\u5c0f\u6392\u5e8f\u5806\u5757\u7684\u65b9\u5f0f\u3002\u540c\u65f6\u6700\u5927\u7684\u5806\u5757\u7684\u5806\u5934\u7684<code>bk_nextsize<\/code>\u6307\u5411\u6700\u5c0f\u7684\u5806\u5757\u7684\u5806\u5934\uff0c\u6700\u5c0f\u5806\u5757\u7684\u5806\u5934\u7684<code>fd_nextsize<\/code>\u6307\u5411\u6700\u5927\u5806\u5757\u7684\u5806\u5934\uff0c\u4ee5\u6b64\u5f62\u6210\u5faa\u73af\u53cc\u94fe\u8868\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='http:\/\/39.104.51.85\/wp-content\/uploads\/2024\/08\/image-11-1024x368.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  decoding=\"async\" width=\"1024\" height=\"368\" data-original=\"http:\/\/39.104.51.85\/wp-content\/uploads\/2024\/08\/image-11-1024x368.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" class=\"wp-image-215\"  sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/div><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"largebin%E7%9A%84%E6%8F%92%E5%85%A5\"><\/span>largebin\u7684\u63d2\u5165<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>1.\u5728delete\u4e00\u4e2a\u5806\u5757\u65f6\uff0c\u5982\u679c\u5176\u8303\u56f4\u8d85\u8fc70x400\uff08\u62160x420\uff0c\u539f\u56e0\u524d\u6587\u63d0\u8fc7\u4e86\uff09\uff0c\u4f1a\u4f18\u5148\u5c06\u5176\u653e\u4e8eunsortedbin\u91cc\uff0c\u4e4b\u540e\uff0c\u5982\u679c\u7533\u8bf7\u4e00\u5757\u6bd4\u5f53\u524dunsortedbin\u5927\u7684\u5806\u5757\uff0c\u90a3\u4e48\u5728\u904d\u5386unsortedbin\u8bd5\u56fe\u5bfb\u627e\u5408\u9002\u5806\u5757\u65f6\uff0c\u4f1a\u5c06\u4e0d\u5408\u9002\u7684\u5806\u5757\u7edf\u7edf\u653e\u5165\u5bf9\u5e94\u7684bin\u91cc\uff0c\u8be5\u653e\u5230smallbin\u7684\u653esmallbin\uff0c\u8be5\u653elargebin\u7684\u653elargebin\uff0c\u4ece\u800c\u6211\u4eec\u53ef\u4ee5\u83b7\u5f97\u4e00\u5757largebin\u3002                                                                                                  2.\u627e\u5230\u5f53\u524d\u8981\u63d2\u5165\u7684chunk\u5bf9\u5e94\u7684largebin\u7684index\uff0c\u5e76\u5b9a\u4f4d\u8be5index\u4e2d\u7684\u6700\u5c0f\u7684chunk\uff1abck\u548c\u6700\u5927\u7684chunk\uff1afwd\u3002<br>3.\u5982\u679cfwd\u7b49\u4e8ebck\uff0c\u8868\u660e\u5f53\u524d\u94fe\u8868\u4e3a\u7a7a\uff0c\u5219\u76f4\u63a5\u5c06\u8be5chunk\u63d2\u5165\uff0c\u5e76\u8bbe\u7f6e\u8be5chunk\u4e3a\u8be5\u5927\u5c0f\u5806\u5757\u7684\u5806\u5934\uff0c\u5c06bk_nextsize\u548cfd_nextsize\u8d4b\u503c\u4e3a\u5b83\u672c\u8eab\u3002<br>4.\u5982\u679cfwd\u4e0d\u7b49\u4e8ebck\uff0c\u8868\u660e\u5f53\u524d\u94fe\u8868\u5df2\u7ecf\u5b58\u5728chunk\uff0c\u8981\u505a\u7684\u5c31\u662f\u627e\u5230\u5f53\u524dchunk\u5bf9\u5e94\u7684\u4f4d\u7f6e\u5c06\u5176\u63d2\u5165\u3002\u9996\u5148\u5224\u65ad\u5176\u5927\u5c0f\u662f\u5426\u5c0f\u4e8e\u6700\u5c0fchunk\u7684size\uff0c(size) &lt; (bck->bk->size)\uff0c\u5982\u679c\u5c0f\u4e8e\u5219\u8bf4\u660e\u8be5chunk\u4e3a\u5f53\u524d\u94fe\u8868\u4e2d\u6700\u5c0f\u7684chunk\uff0c\u5373\u63d2\u5165\u4f4d\u7f6e\u5728\u94fe\u8868\u672b\u5c3e\uff0c<mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-vivid-red-color\">\u65e0\u9700\u904d\u5386\u94fe\u8868<\/mark>\uff08\u8fd9\u91cc\u5173\u7cfb\u52302.31\u524d\u540e\u7684\u533a\u522b\uff09\uff0c\u76f4\u63a5\u63d2\u5165\u5230\u94fe\u8868\u7684\u672b\u5c3e\uff0c\u4e14\u8be5chunk\u6ca1\u6709\u5bf9\u5e94\u7684\u5806\u5934\uff0c\u8bbe\u7f6e\u8be5chunk\u4e3a\u76f8\u5e94\u5806\u5927\u5c0f\u5806\u7684\u5806\u5934\uff0c\u5c06bk_nextsize\u6307\u5411\u6bd4\u5b83\u5927\u7684\u5806\u5934\uff0cfd_nextsize\u6307\u5411\u53cc\u94fe\u8868\u7684\u7b2c\u4e00\u4e2a\u8282\u70b9\u5373\u6700\u5927\u7684\u5806\u5934\u3002<br>5.\u5982\u679c\u5f53\u524dchunk\u7684size\u4e0d\u662f\u6700\u5c0f\u7684chunk\uff0c\u5219\u4ece\u53cc\u94fe\u8868\u7684\u7b2c\u4e00\u4e2a\u8282\u70b9\u5373\u6700\u5927\u7684chunk\u7684\u5806\u5934\u5f00\u59cb\u904d\u5386\uff0c\u901a\u8fc7fd_nextsize\u8fdb\u884c\u904d\u5386\uff0c\u7531\u4e8efd_nextsize\u6307\u5411\u7684\u662f\u6bd4\u5f53\u524d\u5806\u5934\u5c0f\u7684\u5806\u5934\uff0c\u56e0\u6b64\u53ef\u4ee5\u52a0\u5feb\u904d\u5386\u901f\u5ea6\u3002\u76f4\u5230\u627e\u5230\u5c0f\u4e8e\u7b49\u4e8e\u8981\u63d2\u5165\u7684chunk\u7684size\u3002<br>6..\u5982\u679c\u627e\u5230\u7684chunk\u7684size\u7b49\u4e8e\u8981\u63d2\u5165chunk\u7684size\uff0c\u5219\u8bf4\u660e\u5f53\u524d\u8981\u63d2\u5165\u7684chunk\u7684size\u5df2\u7ecf\u5b58\u5728\u5806\u5934\uff0c\u90a3\u4e48\u53ea\u9700\u5c06\u8be5chunk\u63d2\u5165\u5230\u5806\u5934\u7684\u4e0b\u4e00\u4e2a\u8282\u70b9\u3002<br>7.\u5982\u679c\u627e\u5230\u7684chunk\u7684size\u5c0f\u4e8e\u5f53\u524d\u8981\u63d2\u5165chunk\u7684size\uff0c\u5219\u8bf4\u660e\u5f53\u524d\u63d2\u5165\u7684chunk\u4e0d\u5b58\u5728\u5806\u5934\uff0c\u56e0\u6b64\u8be5chunk\u4f1a\u6210\u4e3a\u5806\u5934\u63d2\u5165\u5230\u8be5\u4f4d\u7f6e\uff0c\u8bbe\u7f6efd_nextsize\u4e0ebk_nextsize\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"largebin%E7%9A%84%E5%8F%96%E5%87%BA\"><\/span>largebin\u7684\u53d6\u51fa<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>1.\u627e\u5230\u5f53\u524d\u8981\u7533\u8bf7\u7684\u7a7a\u95f4\u5bf9\u5e94\u7684largebin\u94fe\u8868\uff0c\u5224\u65ad\u7b2c\u4e00\u4e2a\u7ed3\u70b9\u5373\u6700\u5927\u7ed3\u70b9\u7684\u5927\u5c0f\u662f\u5426\u5927\u4e8e\u8981\u7533\u8bf7\u7684\u7a7a\u95f4\uff0c\u5982\u679c\u5c0f\u4e8e\u5219\u8bf4\u660elargebin\u4e2d\u6ca1\u6709\u5408\u9002\u7684\u5806\u5757\uff0c\u9700\u91c7\u7528\u5176\u4ed6\u5206\u914d\u65b9\u5f0f\u3002<br>2.\u5982\u679c\u5f53\u524dlargebin\u4e2d\u5b58\u5728\u5408\u9002\u7684\u5806\u5757\uff0c\u5219\u4ece\u6700\u5c0f\u5806\u5757\u5f00\u59cb\uff0c\u901a\u8fc7bk_nextsize\u53cd\u5411\u904d\u5386\u94fe\u8868\uff0c\u627e\u5230\u5927\u4e8e\u7b49\u4e8e\u5f53\u524d\u7533\u8bf7\u7a7a\u95f4\u7684\u7ed3\u70b9\u3002<br>3.\u4e3a\u51cf\u5c11\u64cd\u4f5c\uff0c\u5224\u65ad\u627e\u5230\u7684\u76f8\u5e94\u7ed3\u70b9\uff08\u5806\u5934\uff09\u7684\u4e0b\u4e2a\u7ed3\u70b9\u662f\u5426\u662f\u76f8\u540c\u5927\u5c0f\u7684\u5806\u5757\uff0c\u5982\u679c\u662f\u7684\u8bdd\uff0c\u5c06\u76ee\u6807\u8bbe\u7f6e\u4e3a\u8be5\u5806\u5934\u7684\u7b2c\u4e8c\u4e2a\u7ed3\u70b9\uff0c\u4ee5\u6b64\u51cf\u5c11\u5c06fd_nextsize\u4e0ebk_nextsize\u8d4b\u503c\u7684\u64cd\u4f5c\u3002<br>4.\u8c03\u7528unlink\u5c06\u76ee\u6807largebin chunk\u4ece\u53cc\u94fe\u8868\u4e2d\u53d6\u4e0b\u3002<br>5.\u5224\u65ad\u5269\u4f59\u7a7a\u95f4\u662f\u5426\u5c0f\u4e8eMINSIZE\uff0c\u5982\u679c\u5c0f\u4e8e\u76f4\u63a5\u8fd4\u56de\u7ed9\u7528\u6237\u3002\u5426\u5219\u5c06\u5269\u4f59\u7684\u7a7a\u95f4\u6784\u6210\u65b0\u7684chunk\u653e\u5165\u5230unsorted bin\u4e2d\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"largebin-attack\"><\/span>largebin attack<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<h4 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%E5%8F%96%E5%87%BA%E6%97%B6attack\"><\/span>\u53d6\u51fa\u65f6attack<span class=\"ez-toc-section-end\"><\/span><\/h4>\n\n\n\n<p>\u6ca1\u5b66\uff0c\u60f3\u770b<a href=\"https:\/\/bbs.kanxue.com\/thread-262424.htm\">\u70b9\u8fd9\u91cc<\/a><\/p>\n\n\n\n<h4 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%E6%8F%92%E5%85%A5%E6%97%B6attack\"><\/span>\u63d2\u5165\u65f6attack<span class=\"ez-toc-section-end\"><\/span><\/h4>\n\n\n\n<h5 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"230%E4%BB%A5%E5%89%8D\"><\/span>2.30\u4ee5\u524d<span class=\"ez-toc-section-end\"><\/span><\/h5>\n\n\n\n<p>\u57282.30\u4ee5\u524d\uff0c\u7f3a\u5c11\u5bf9largebin attack\u7684\u68c0\u67e5\uff0c\u6240\u4ee5\u6211\u4eec\u53ef\u4ee5\u5927\u80c6\u7684\u8fdb\u884c\u4f2a\u9020\uff0c\u5728\u63d2\u5165\u4e00\u5757\u65b0\u7684largebin\u65f6\uff0c\u4f1a\u5c06\u5f53\u524d\u5806\u5757\u7684bk->fd\u548cbk_nextsize->fd_nextsize\u5199\u6210\u5f53\u524d\u5806\u5757\u7684\u5730\u5740\uff0c\u5982\u4e0b\u56fe\uff0c\u6240\u4ee5\u5982\u679c\u6839\u636e\u4e0b\u56fe\u628abk\u6784\u9020\u6210targetaddr1-0x10\uff0cbk_nextsize\u6784\u9020\u6210targetaddr1-0x20\uff0c\u5373\u53ef\u5728\u63d2\u5165largebin\u65f6\u89e6\u53d1unlink\u8fdb\u884c\u540c\u65f6\u6539\u5199\u4e24\u5904\u5730\u5740\u4e3aheapaddr<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='http:\/\/39.104.51.85\/wp-content\/uploads\/2024\/08\/image-8-1024x262.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  decoding=\"async\" width=\"1024\" height=\"262\" data-original=\"http:\/\/39.104.51.85\/wp-content\/uploads\/2024\/08\/image-8-1024x262.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" class=\"wp-image-212\"  sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/div><\/figure>\n\n\n\n<h5 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"230%E4%BB%A5%E5%90%8E\"><\/span>2.30\u4ee5\u540e<span class=\"ez-toc-section-end\"><\/span><\/h5>\n\n\n\n<p>2.30\u4e4b\u540e\u4f1a\u8fdb\u884c\u5982\u4e0b\u4e24\u4e2a\u68c0\u67e5<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='http:\/\/39.104.51.85\/wp-content\/uploads\/2024\/08\/image-13-1024x441.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  decoding=\"async\" width=\"1024\" height=\"441\" data-original=\"http:\/\/39.104.51.85\/wp-content\/uploads\/2024\/08\/image-13-1024x441.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" class=\"wp-image-217\"  sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/div><\/figure>\n\n\n\n<p>\u8fd9\u5c31\u5bfc\u81f4\u5728\u7533\u8bf7\u7684\u5806\u5757\u5927\u4e8e\u6700\u5c0fchunk\u65f6\u6211\u4eec\u4e0d\u80fd\u968f\u610f\u5730\u4fee\u6539bk\u548cbk_nextsize\u4e86\uff0c\u4e3a\u4e86\u7ed5\u8fc7\u8fd9\u4e2a\u68c0\u67e5\uff0c\u6211\u4eec\u8981\u4f7f\u5f97\u5f53\u524d\u7533\u8bf7\u7684\u5806\u5757\u5c0f\u4e8e\u76ee\u524d\u7684\u6700\u5c0fchunk\uff08\u5373\u5b83\u662f\u65b0\u7684\u6700\u5c0f\uff09\uff0c\u8fd8\u8bb0\u5f97\u4e3a\u4ec0\u4e48\u5417\uff1f\u4e0a\u6587\u4e2d\u7ea2\u8272\u7684\u90e8\u5206\uff0c\u56e0\u4e3a\u5982\u679c\u5b83\u662f\u6700\u5c0f\u5b83\u4f1a\u76f4\u63a5\u88ab\u94fe\u5165\uff0c\u6ca1\u6709\u8fd9\u4e9b\u4e71\u4e03\u516b\u7cdf\u7684\u68c0\u67e5\uff0c\u4f46\u8fd9\u4e5f\u5bfc\u81f4\u4ed6\u53ea\u80fd\u4efb\u610f\u5199bk_nextsize\u6307\u5411\u7684\u4f4d\u7f6e\uff0c\u6240\u4ee5\u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b\uff0c\u53ef\u4ee5\u5c06bk_nextsize\u8d4b\u6210targetaddr-0x20<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='http:\/\/39.104.51.85\/wp-content\/uploads\/2024\/08\/image-14.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  decoding=\"async\" width=\"627\" height=\"58\" data-original=\"http:\/\/39.104.51.85\/wp-content\/uploads\/2024\/08\/image-14.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" class=\"wp-image-218\"  sizes=\"(max-width: 627px) 100vw, 627px\" 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