{"id":112,"date":"2025-07-21T17:25:03","date_gmt":"2025-07-21T09:25:03","guid":{"rendered":"http:\/\/lycoreco.cn\/?p=112"},"modified":"2025-07-21T17:25:04","modified_gmt":"2025-07-21T09:25:04","slug":"ctfshowpwn137","status":"publish","type":"post","link":"http:\/\/lycoreco.cn\/index.php\/2025\/07\/21\/ctfshowpwn137\/","title":{"rendered":"ctfshow:pwn137"},"content":{"rendered":"\n<p>\u7ee7\u7eed\u505a\u524d\u7f6e\u57fa\u7840<\/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:\/\/lycoreco.cn\/wp-content\/uploads\/2025\/07\/\u5c4f\u5e55\u622a\u56fe-2025-07-21-161241-1024x590.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"590\" data-original=\"http:\/\/lycoreco.cn\/wp-content\/uploads\/2025\/07\/\u5c4f\u5e55\u622a\u56fe-2025-07-21-161241-1024x590.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" class=\"wp-image-113\"  sizes=\"auto, (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:\/\/lycoreco.cn\/wp-content\/uploads\/2025\/07\/\u5c4f\u5e55\u622a\u56fe-2025-07-21-161522.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  loading=\"lazy\" decoding=\"async\" width=\"861\" height=\"544\" data-original=\"http:\/\/lycoreco.cn\/wp-content\/uploads\/2025\/07\/\u5c4f\u5e55\u622a\u56fe-2025-07-21-161522.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" class=\"wp-image-114\"  sizes=\"auto, (max-width: 861px) 100vw, 861px\" \/><\/div><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\"><br>1.\u5206\u6790<\/h2>\n\n\n\n<figure class=\"wp-block-image size-full\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='http:\/\/lycoreco.cn\/wp-content\/uploads\/2025\/07\/\u5c4f\u5e55\u622a\u56fe-2025-07-21-161645.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  loading=\"lazy\" decoding=\"async\" width=\"695\" height=\"530\" data-original=\"http:\/\/lycoreco.cn\/wp-content\/uploads\/2025\/07\/\u5c4f\u5e55\u622a\u56fe-2025-07-21-161645.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" class=\"wp-image-115\"  sizes=\"auto, (max-width: 695px) 100vw, 695px\" \/><\/div><\/figure>\n\n\n\n<p id=\"uc02c8155\">\u4e3b\u8981\u662f\u8fd9\u4e2a\u51fd\u6570\uff0c\u8fd0\u884c\u5c31\u6709flag<\/p>\n\n\n\n<p id=\"u26f62f26\">ok\u5148\u5b66\u4e60\u4e00\u4e9b\u77e5\u8bc6\u5427<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>v0 = getpid();<\/code><\/pre>\n\n\n\n<p id=\"u21b92f5e\"><strong>getpid\u51fd\u6570<\/strong><\/p>\n\n\n\n<p id=\"u616478eb\">\u7528\u6765\u83b7\u53d6PID(PID\u662f\u4e00\u4e2a\u552f\u4e00\u7684\u6574\u6570\uff0c\u53ef\u4ee5\u7528\u6765\u6807\u8bc6\u7cfb\u7edf\u4e2d\u7684\u6bcf\u4e00\u4e2a\u8fdb\u7a0b),\u4e0d\u4f1apython\u54c8\u54c8<\/p>\n\n\n\n<p id=\"uf530d532\">sbrk\u51fd\u6570<\/p>\n\n\n\n<p id=\"ue9ee6f36\">sbrk\u51fd\u6570\u7684\u5de5\u4f5c\u539f\u7406<\/p>\n\n\n\n<p id=\"u70fedfbd\">sbrk\u51fd\u6570\u901a\u8fc7\u63a5\u6536\u4e00\u4e2a\u6574\u6570\u53c2\u6570\uff08\u53ef\u4ee5\u662f\u6b63\u6570\u6216\u8d1f\u6570\uff09\uff0c\u6765\u589e\u52a0\u6216\u51cf\u5c11\u8fdb\u7a0b\u7684\u5806\u7a7a\u95f4\u3002\u5f53\u53c2\u6570\u4e3a\u6b63\u6570\u65f6\uff0c\u5806\u7a7a\u95f4\u589e\u52a0\uff1b\u5f53\u53c2\u6570\u4e3a\u8d1f\u6570\u65f6\uff0c\u5806\u7a7a\u95f4\u51cf\u5c11\u3002\u8c03\u7528\u6210\u529f\u65f6\uff0csbrk\u8fd4\u56de\u65b0\u7684\u5806\u9876\u5730\u5740\u7684\u6307\u9488\uff1b\u5982\u679c\u8c03\u7528\u5931\u8d25\uff0c\u5219\u8fd4\u56de(void *)-1\u3002<\/p>\n\n\n\n<p id=\"u693c33d6\">brk\u63a5\u53e3\u7684\u5b9a\u4e49\u4e0e\u529f\u80fd<\/p>\n\n\n\n<p id=\"ua12c0b74\">brk()\u548csbrk()\u662f\u4e24\u4e2a\u76f8\u5173\u7684\u7cfb\u7edf\u8c03\u7528\uff1a<\/p>\n\n\n\n<p id=\"u913ee69b\">brk()\uff1a\u8bbe\u7f6e\u5806\u7684\u7ed3\u675f\u5730\u5740\uff08\u5373\u5806\u9876\u6307\u9488\uff09\u4e3a\u6307\u5b9a\u7684\u7edd\u5bf9\u5730\u5740\u3002<\/p>\n\n\n\n<p id=\"u7e62ca55\">sbrk()\uff1a\u901a\u8fc7\u76f8\u5bf9\u504f\u79fb\u91cf\u8c03\u6574\u5806\u9876\u6307\u9488\uff0c\u5e76\u8fd4\u56de\u8c03\u6574\u524d\u7684\u5806\u9876\u5730\u5740\u3002<\/p>\n\n\n\n<p id=\"u18116c2e\">\u5b83\u4eec\u7684\u4e3b\u8981\u4f5c\u7528\u662f\u52a8\u6001\u8c03\u6574\u5806\u7684\u5927\u5c0f\uff0c\u4ece\u800c\u4e3a\u8fdb\u7a0b\u5206\u914d\u6216\u91ca\u653e\u5185\u5b58\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>#include &lt;unistd.h>\n\n\/\/ brk() \u8bbe\u7f6e\u5806\u9876\u6307\u9488\nint brk(void *addr);\n\n\/\/ sbrk() \u8c03\u6574\u5806\u9876\u6307\u9488\nvoid *sbrk(intptr_t increment);<\/code><\/pre>\n\n\n\n<p id=\"u0d7c70ba\">\u5148\u8bb0\u8fd9\u4e9b<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"tKDeW\">2.\u5b9e\u64cd<\/h2>\n\n\n\n<figure class=\"wp-block-image size-full\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='http:\/\/lycoreco.cn\/wp-content\/uploads\/2025\/07\/\u5c4f\u5e55\u622a\u56fe-2025-07-21-164451.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  loading=\"lazy\" decoding=\"async\" width=\"1179\" height=\"546\" data-original=\"http:\/\/lycoreco.cn\/wp-content\/uploads\/2025\/07\/\u5c4f\u5e55\u622a\u56fe-2025-07-21-164451.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" class=\"wp-image-117\"  sizes=\"auto, (max-width: 1179px) 100vw, 1179px\" \/><\/div><\/figure>\n\n\n\n<p id=\"u1e2a6df2\">\u53ef\u4ee5\u770b\u51fabrk()\u548csbrk()\u7684\u529f\u80fd\u4e86\uff0csbrk()\u901a\u8fc7\u76f8\u5bf9\u504f\u79fb\u91cf\u8c03\u6574\u5806\u9876\u6307\u9488\uff0c\u5e76\u8fd4\u56de\u8c03\u6574\u524d\u7684\u5806\u9876\u5730\u5740\u3002<\/p>\n\n\n\n<p id=\"ue0b2f385\">\u597d\u4e86\u4eca\u5929\u5c31\u5230\u8fd9\u513f<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u7ee7\u7eed\u505a\u524d\u7f6e\u57fa\u7840 1.\u5206\u6790 \u4e3b\u8981\u662f\u8fd9\u4e2a\u51fd\u6570\uff0c\u8fd0\u884c\u5c31\u6709flag ok\u5148\u5b66\u4e60\u4e00\u4e9b\u77e5\u8bc6\u5427 getpid\u51fd\u6570 \u7528\u6765\u83b7\u53d6P [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":118,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[4],"class_list":["post-112","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-learn","tag-pwn"],"_links":{"self":[{"href":"http:\/\/lycoreco.cn\/index.php\/wp-json\/wp\/v2\/posts\/112","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/lycoreco.cn\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/lycoreco.cn\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/lycoreco.cn\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/lycoreco.cn\/index.php\/wp-json\/wp\/v2\/comments?post=112"}],"version-history":[{"count":1,"href":"http:\/\/lycoreco.cn\/index.php\/wp-json\/wp\/v2\/posts\/112\/revisions"}],"predecessor-version":[{"id":119,"href":"http:\/\/lycoreco.cn\/index.php\/wp-json\/wp\/v2\/posts\/112\/revisions\/119"}],"wp:featuredmedia":[{"embeddable":true,"href":"http:\/\/lycoreco.cn\/index.php\/wp-json\/wp\/v2\/media\/118"}],"wp:attachment":[{"href":"http:\/\/lycoreco.cn\/index.php\/wp-json\/wp\/v2\/media?parent=112"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/lycoreco.cn\/index.php\/wp-json\/wp\/v2\/categories?post=112"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/lycoreco.cn\/index.php\/wp-json\/wp\/v2\/tags?post=112"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}