{"id":175,"date":"2025-11-06T17:19:29","date_gmt":"2025-11-06T09:19:29","guid":{"rendered":"http:\/\/www.xuanbin.top\/?p=175"},"modified":"2025-11-26T20:15:51","modified_gmt":"2025-11-26T12:15:51","slug":"glibc%e5%86%85%e5%ad%98%e7%ae%a1%e7%90%86-bins","status":"publish","type":"post","link":"http:\/\/www.xuanbin.top\/index.php\/2025\/11\/06\/glibc%e5%86%85%e5%ad%98%e7%ae%a1%e7%90%86-bins\/","title":{"rendered":"Glibc\u5185\u5b58\u7ba1\u7406\u2014\u2014bins"},"content":{"rendered":"\n<p>chunk\u5206\u914d\u4e86\u5fc5\u7136\u662f\u8981\u56de\u6536\u7684\uff0c\u4e3a\u4e86\u66f4\u9ad8\u6548\u7684\u5206\u914d\u4e0e\u56de\u6536\uff0c\u6700\u65e9glibc\u63d0\u4f9b\u4e86BIN\u6570\u7ec4\u7528\u6765\u5b9e\u73b0unsorted bin\uff0csmall bin\uff0clargebin\u3002\u4e3a\u4e86\u4fbf\u4e8e\u5c0fchunk\u7684\u56de\u6536\u4e0e\u5206\u914d\uff0c\u63d0\u4f9b\u4e86fast bin\u3002\u4e3a\u4e86\u89e3\u51b3\u591a\u7ebf\u7a0b\u4e92\u65a5\u4ea7\u751f\u7684\u6027\u80fd\u6d6a\u8d39\uff0c\u63d0\u4f9b\u4e86tcache bin\u3002<\/p>\n\n\n\n<p>\u5982\u679c\u5185\u5bb9\u6709\u7591\u95ee\u6216\u662f\u9519\u8bef\uff0c\u8fd8\u8bf7\u5404\u4f4d\u5e08\u5085\u6307\u51fa\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Small bin\uff0cLarge bin\uff0cUnsorted bin<\/h2>\n\n\n\n<p>\u4e8b\u5b9e\u4e0a\uff0c\u8fd9\u4e09\u4e2abin\u50a8\u5b58\u5728\u4e00\u4e2aBIN[127]\u6570\u7ec4\u91cc\u3002<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>BIN[0]\u672a\u88ab\u4f7f\u7528<\/li>\n\n\n\n<li>BIN[1] unsorted bin<\/li>\n\n\n\n<li>BIN[2]~BIN[63] small bin<\/li>\n\n\n\n<li>BIN[64]~BIN[126] large bin<\/li>\n<\/ul>\n\n\n\n<p>\u5148\u4ece\u6700\u7b80\u5355\u7684small bin\u5f00\u59cb\uff0cBIN[2]\u5230BIN[63]\u517162\u4e2a\u6307\u9488\uff0c\u6bcf\u4e00\u4e2a\u6307\u9488\u90fd\u662f\u4e00\u4e2a\u53cc\u5411\u94fe\u8868\uff0c\u572864\u4f4d\u4e0b\u4f9d\u6b21\u5b58\u50a8\u4ece32\u52301008\u95f4\u969416\u7684chunk\uff0c\u94fe\u8868\u901a\u8fc7chunk\u7684fd\u4e0ebk\u6307\u9488\u94fe\u63a5\u3002<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>fd\u6307\u5411\u524d\u4e00\u4e2a\u7a7a\u95f2chunk\uff0cbk\u6307\u5411\u540e\u4e00\u4e2a\u7a7a\u95f2chunk\u3002\u8fd9\u91cc\u524d\u4e00\u4e2a\u540e\u4e00\u4e2a\u5e76\u975e\u662f\u7269\u7406\u5730\u5740\u4e0a\u7684\u76f8\u90bb\uff0c\u800c\u662f\u94fe\u8868\u4e0a\u7684\u76f8\u90bb\u3002<\/li>\n<\/ul>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"403\" height=\"362\" src=\"http:\/\/www.xuanbin.top\/wp-content\/uploads\/2025\/11\/1762416301-QQ_1762416292839.png\" alt=\"\" class=\"wp-image-176\" srcset=\"http:\/\/www.xuanbin.top\/wp-content\/uploads\/2025\/11\/1762416301-QQ_1762416292839.png 403w, http:\/\/www.xuanbin.top\/wp-content\/uploads\/2025\/11\/1762416301-QQ_1762416292839-300x269.png 300w\" sizes=\"auto, (max-width: 403px) 100vw, 403px\" \/><\/figure>\n\n\n\n<p>\u503c\u5f97\u6ce8\u610f\u7684\u662f\uff0c\u5f53\u4ecesmall bin\u4e2d\u7533\u8bf7chunk\u65f6\uff0c\u9075\u5faaLIFO\uff0c\u7c7b\u4f3c\u4e8e\u6808\u3002<\/p>\n\n\n\n<p>\u5bf9\u4e8esmall bin\u6765\u8bf4\u6bcf\u4e2abin\u94fe\u8868\u5b58\u50a8\u7684\u90fd\u662f\u76f8\u540c\u5927\u5c0f\u7684chunk\uff0c\u5bf9\u4e8elarge bin\u6765\u8bf4\u6bcf\u4e2a\u94fe\u8868\u5b58\u50a8\u7684\u662f\u4e00\u4e2a\u533a\u95f4\u5927\u5c0f\u7684chunk\uff0c\u751a\u81f3\u6709\u591a\u4e2a\u94fe\u8868\u5b58\u50a8\u540c\u4e00\u4e2a\u533a\u95f4\u5927\u5c0f\u7684chunk\u3002\uff08\u4f46\u4e00\u4e2achunk\u53ea\u4f1a\u88ab\u5b58\u5728\u4e00\u4e2a\u94fe\u8868\u91cc\uff09<\/p>\n\n\n\n<p>unsorted bin\u5176\u5b9e\u662f\u4f5c\u4e3asmall bin\u4e0elarge bin\u7684\u7f13\u51b2\u533a\uff0c\u56e0\u4e3a\u7a0b\u5e8f\u5f80\u5f80\u4f1a\u4ee5\u7ed3\u6784\u4f53\u4e3a\u5355\u4f4d\u8fdb\u884c\u5185\u5b58\u7684\u7533\u8bf7\u4e0e\u56de\u6536\uff0c\u6240\u4ee5\u5728\u91ca\u653e\u5185\u5b58\u5757\u540e\u53c8\u5bf9\u76f8\u540c\u5927\u5c0f\u7684\u5185\u5b58\u5757\u8fdb\u884c\u7533\u8bf7\u662f\u5f88\u5e38\u89c1\u7684\u3002\u4e8e\u662funsorted bin\u540c\u6837\u7ef4\u62a4\u4e00\u4e2a\u53cc\u5411\u94fe\u8868\uff0c\u53ef\u4ee5\u62bd\u8c61\u7406\u89e3\u4e3a\uff0c\u7a0b\u5e8f\u56de\u6536chunk\u65f6\uff0cchunk\u5148\u8fdb\u5165unsorted bin\u671f\u5f85\u88ab\u7acb\u9a6c\u91cd\u65b0\u7533\u8bf7\uff0c\u5728\u4e0b\u6b21\u7533\u8bf7\u65f6\u5982\u679c\u4e0d\u80fd\u7cbe\u786e\u5339\u914d\u7533\u8bf7\u7684\u5927\u5c0f\uff0c\u4fbf\u4f9d\u636echunk\u7684\u5927\u5c0f\u8fdb\u5165small bin\u4e0elarge bin\u7b49\u5f85\u5408\u5e76\u6216\u5728\u7533\u8bf7\u65f6\u5206\u5272\u3002<\/p>\n\n\n\n<p>\u53ef\u80fd\u662f\u6211\u7406\u89e3\u4e0d\u6df1\u4e14\u89c1\u8bc6\u592a\u5c11\uff0c\u5bf9\u4e8ectf\u4e2d\u7684pwn\u6765\u8bf4unsorted bin,fast bin,large bin\u7528\u7684\u90fd\u4e0d\u7b97\u5f88\u591a\uff0c\u5bf9\u4e8e\u73b0\u5b9e\u4e2d\u7684pwn\u5e94\u8be5\u7528\u7684\u66f4\u591a\uff08\u6bd5\u7adf\u771f\u5b9e\u73af\u5883\u7684\u7533\u8bf7\u548c\u56de\u6536\u64cd\u4f5c\u7684\u6570\u91cf\u7ea7\u5e94\u8be5\u8fdc\u5927\u4e8ectf\uff09\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Fast bin<\/h2>\n\n\n\n<p>\u5148\u533a\u5206fast bin\u4e0e\u524d\u4e09\u79cdbin\u7684\u533a\u522b<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>fast bin\u53ea\u4f7f\u7528fd\uff0c\u6240\u4ee5fast bin\u662f\u4e00\u4e2a\u5355\u5411\u94fe\u8868<\/li>\n\n\n\n<li>chunk\u8fdb\u5165fast bin\u540e\u5e76\u4e0d\u4f1a\u88ab\u5408\u5e76<\/li>\n<\/ul>\n\n\n\n<p>\u6700\u5173\u952e\u7684\u5730\u65b9\u5c31\u5728\u4e8efast bin\u4f1a\u7ef4\u6301chunk\u7684\u4f7f\u7528\u72b6\u6001\u6765\u907f\u514dchunk\u88ab\u5408\u5e76\uff0c\u524d\u6587\u63d0\u5230\u76f8\u540c\u5927\u5c0f\u7684chunk\u7684\u56de\u6536\u4e0e\u7533\u8bf7\u5f80\u5f80\u662f\u9891\u7e41\u7684\uff0c\u5728\u5185\u5b58\u7a7a\u95f4\u4e0a\u4e5f\u6709\u8f83\u5927\u53ef\u80fd\u662f\u76f8\u90bb\u7684\uff0c\u5982\u679c\u77ed\u65f6\u95f4\u5927\u91cf\u7533\u8bf7\u4e86\u4e00\u4e2a\u5927\u5c0f\u7684chunk\uff0c\u800c\u540e\u53c8\u4e00\u4e00\u56de\u6536\uff0c\u4f1a\u4ea7\u751f\u5927\u91cf\u7684\u6d6a\u8d39\u5728\u5408\u5e76\u4e0e\u4ee5\u540e\u7684\u5206\u5272\u4e0a\u3002<\/p>\n\n\n\n<p>64\u4f4d\u4e0b\uff0cfast bin\u4e2d\u7684chunk\u5927\u5c0f\u8303\u56f4\u4e3a16~128B\uff0c\u8fd9\u4e0esmall bin\u6709\u4e00\u4e9b\u91cd\u5408\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Tcache bin<\/h2>\n\n\n\n<p>\u5728glibc 2.26\u4ee5\u540e\u7684\u7248\u672c\u5f15\u5165\u4e86Tcache bin\uff0c\u5176\u7528\u610f\u662f\u4e3a\u4e86\u89e3\u51b3\u591a\u7ebf\u7a0b\u5bf9bin\u4e2dchunk\u7684\u7533\u8bf7\u3002\u5982\u679c\u4e24\u4e2a\u7ebf\u7a0b\u540c\u65f6\u5bf9fast bin\u7533\u8bf7\u540c\u6837\u5927\u5c0f\u7684chunk\uff0c\u5728\u4e0d\u52a0\u9501\u7684\u60c5\u51b5\u4e0b\u53ef\u80fd\u4f1a\u7d22\u5f15\u5230\u540c\u4e00\u4e2achunk\u4ece\u800c\u5f15\u53d1\u6df7\u4e71\u3002\u6240\u4ee5\u4e0d\u540c\u7ebf\u7a0b\u4e4b\u95f4\u5171\u4eab\u7684fast bin\uff0csmall bin\uff0clarge bin\uff0cunsorted bin\u5b9e\u9645\u4e0a\u90fd\u662f\u6709\u4e92\u65a5\u9501\u7684\uff0c\u4f46\u4e92\u65a5\u9501\u53c8\u5bf9\u6027\u80fd\u6709\u5f88\u5927\u5f71\u54cd\uff0c\u4e8e\u662f\u6bcf\u4e2a\u7ebf\u7a0b\u72ec\u7acb\u7ef4\u62a4\u4e00\u4e2aTcache bin\u6765\u4fdd\u6301\u9ad8\u6548\u3002<\/p>\n\n\n\n<p>\u540c\u6837\uff0cTcache bin\u4e5f\u4f1a\u7ef4\u6301chunk\u7684\u4f7f\u7528\u72b6\u6001\uff0c\u4f7f\u5176\u4e0d\u4ea7\u751f\u5408\u5e76\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Tcache bin \u6bcf\u79cd\u76f8\u540c\u5927\u5c0f\u7684chunk\u6700\u591a\u5b58\u653e\u4e03\u4e2a<\/h3>\n\n\n\n<p>\u8bbe\u8ba1\u4e00\u4e2a\u7a0b\u5e8f\u7528gdb\u8c03\u8bd5<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>#include &lt;stdio.h&gt;\n#include &lt;stdlib.h&gt;\n\nint main(void)\n{\n    void *chunk1,*chunk2,*chunk3,*chunk4,*chunk5,*chunk6,*chunk7,*chunk8,*chunk9;\n    chunk1=malloc(0x30);\t\n    chunk2=malloc(0x30);\n    chunk3=malloc(0x30);\n    chunk4=malloc(0x30);\n    chunk5=malloc(0x30);\n    chunk6=malloc(0x30);\n    chunk7=malloc(0x30);\n    chunk8=malloc(0x30);\n    chunk9=malloc(0x30);\n\t\/\/ free\n    free(chunk1);\n    free(chunk2);\n    free(chunk3);\n    free(chunk4);\n    free(chunk5);\n    free(chunk6);\n    free(chunk7);\n    free(chunk8);\n    free(chunk9);\n    return 0;\n}<\/code><\/pre>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"563\" src=\"http:\/\/www.xuanbin.top\/wp-content\/uploads\/2025\/11\/1762420560-QQ_1762420551889-1024x563.png\" alt=\"\" class=\"wp-image-178\" srcset=\"http:\/\/www.xuanbin.top\/wp-content\/uploads\/2025\/11\/1762420560-QQ_1762420551889-1024x563.png 1024w, http:\/\/www.xuanbin.top\/wp-content\/uploads\/2025\/11\/1762420560-QQ_1762420551889-300x165.png 300w, http:\/\/www.xuanbin.top\/wp-content\/uploads\/2025\/11\/1762420560-QQ_1762420551889-768x422.png 768w, http:\/\/www.xuanbin.top\/wp-content\/uploads\/2025\/11\/1762420560-QQ_1762420551889.png 1246w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p>\u7533\u8bf79\u4e2a0x30\u5927\u5c0f\u7684\u5185\u5b58\uff0c\u5b9e\u9645\u5206\u914d9\u4e2a0x40\u5927\u5c0f\u7684chunk\u3002\u968f\u540e\u5728\u56de\u6536\u65f6\uff0c\u6700\u540e\u91ca\u653e\u7684\u4e03\u4e2a\u8fdb\u5165tcache bin\uff0c\u5148\u53bb\u91ca\u653e\u7684\u4e24\u4e2a\u88ab\u6324\u5230fast bin\u4e2d\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>chunk\u5206\u914d\u4e86\u5fc5\u7136\u662f\u8981\u56de\u6536\u7684\uff0c\u4e3a\u4e86\u66f4\u9ad8\u6548\u7684\u5206\u914d\u4e0e\u56de\u6536\uff0c\u6700\u65e9glibc\u63d0\u4f9b\u4e86BIN\u6570\u7ec4\u7528\u6765\u5b9e\u73b0unsorted bin\uff0csmall &#8230;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"emotion":"","emotion_color":"","title_style":"","license":"","footnotes":""},"categories":[1],"tags":[],"class_list":["post-175","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"_links":{"self":[{"href":"http:\/\/www.xuanbin.top\/index.php\/wp-json\/wp\/v2\/posts\/175","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/www.xuanbin.top\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.xuanbin.top\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.xuanbin.top\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/www.xuanbin.top\/index.php\/wp-json\/wp\/v2\/comments?post=175"}],"version-history":[{"count":3,"href":"http:\/\/www.xuanbin.top\/index.php\/wp-json\/wp\/v2\/posts\/175\/revisions"}],"predecessor-version":[{"id":223,"href":"http:\/\/www.xuanbin.top\/index.php\/wp-json\/wp\/v2\/posts\/175\/revisions\/223"}],"wp:attachment":[{"href":"http:\/\/www.xuanbin.top\/index.php\/wp-json\/wp\/v2\/media?parent=175"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.xuanbin.top\/index.php\/wp-json\/wp\/v2\/categories?post=175"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.xuanbin.top\/index.php\/wp-json\/wp\/v2\/tags?post=175"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}