{"id":2229,"date":"2022-04-14T20:55:55","date_gmt":"2022-04-14T12:55:55","guid":{"rendered":"https:\/\/www.xianwaizhiyin.net\/?p=2229"},"modified":"2022-06-11T02:01:45","modified_gmt":"2022-06-10T18:01:45","slug":"%e3%80%8a%e7%bc%96%e8%af%91%e7%b3%bb%e7%bb%9f-%e8%87%aa%e5%ba%95%e5%90%91%e4%b8%8a%e7%a0%94%e7%a9%b6%e6%96%b9%e6%b3%95%e3%80%8b%e7%94%a8%e6%9c%ba%e5%99%a8%e7%a0%81%e6%9d%a5%e7%bc%96%e7%a8%8b","status":"publish","type":"post","link":"https:\/\/www.xianwaizhiyin.net\/?p=2229","title":{"rendered":"\u300a\u7f16\u8bd1\u7cfb\u7edf-\u81ea\u5e95\u5411\u4e0a\u7814\u7a76\u65b9\u6cd5\u300b\u7528\u673a\u5668\u7801\u6765\u7f16\u7a0b"},"content":{"rendered":"\n<p>\u6e90\u7801\u4e0b\u8f7d\u5730\u5740\uff1a<a href=\"https:\/\/pan.baidu.com\/s\/1wBdCbZqWCQv0igSIuzqkpw\">\u767e\u5ea6\u7f51\u76d8<\/a>\uff0c\u63d0\u53d6\u7801\uff1acat1 \u3002<\/p>\n\n\n\n<p>\u901a\u8fc7\u524d\u9762\u7684\u6587\u7ae0<a href=\"https:\/\/www.xianwaizhiyin.net\/?p=2219\"><strong>\u300a\u7f16\u8bd1\u7cfb\u7edf-\u81ea\u5e95\u5411\u4e0a\u7814\u7a76\u65b9\u6cd5\u300bELF\u7b26\u53f7\u6bb5<\/strong><\/a> \uff0c\u57fa\u672c\u5df2\u7ecf\u77e5\u9053\u4e86 \u7b26\u53f7\u8868\u7684 \u4f5c\u7528\uff0c\u5c31\u662f\u80fd\u627e\u5230 \u53d8\u91cf\uff0c\u6216\u8005\u51fd\u6570\u7684\u4f4d\u7f6e\u3002\u8fd8\u662f\u7528 main \u9879\u76ee\u6765\u5206\u6790\uff0c\u9879\u76ee\u91cc\u9762\u6709\u4e2a <code class=\"prettyprint\" >sum.c<\/code> \u6587\u4ef6\uff0c\u91cc\u9762\u6709\u4e2a sum \u51fd\u6570\u3002\u5982\u4e0b\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code class=\"prettyprint\" >int sum(int *a,int n){\n    int s = 0;\n    for (int i = 0; i &lt; n; i++) {\n        s += a&#091;i];\n    }\n    return s;\n};<\/code><\/pre>\n\n\n\n<p>\u5047\u8bbe sum \u662f\u4e00\u4e2a \u83b7\u53d6 \u6b66\u529b\u503c \u7684\u51fd\u6570\uff0c\u6211\u4eec\u60f3 hack \u8fd9\u6b3e\u6e38\u620f\uff0c\u628a\u4ed6\u7684\u6b66\u529b\u503c \u52a0\u5927 1000\uff0c\u90a3\u53ea\u9700\u8981 \u4fee\u6539 sum \u51fd\u6570\u7684\u8fd4\u56de\u503c\u5373\u53ef\u3002\u5047\u8bbe\u6211\u4eec\u6ca1\u6709 C \u7a0b\u5e8f\u4ee3\u7801\uff0c\u53ea\u6709\u4e00\u4e2a main \u53ef\u6267\u884c\u6587\u4ef6\uff0c\u4e0b\u9762\u5c31\u5c55\u793a\u4e00\u4e0b\u5982\u4f55\u7528 \u673a\u5668\u7801 \u6765\u5b9e\u73b0 \u52a0\u5927 \u6b66\u529b\u503c \u8fd9\u4e2a\u529f\u80fd\u3002<\/p>\n\n\n\n<p>google_ads_content<\/p>\n\n\n\n<p>\u6211\u4eec\u77e5\u9053\uff0c \u51fd\u6570\u7684\u8fd4\u56de\u503c \u4e00\u822c\u90fd\u662f\u653e\u5728 <code class=\"prettyprint\" >eax<\/code> \u5bc4\u5b58\u5668\uff0c\u7ed9\u4e0a\u5c42\u7528\u7684\uff0c\u6240\u4ee5\u53ea\u9700\u8981\u628a <code>eax<\/code> \u52a0 1000 \u5373\u53ef\u3002<\/p>\n\n\n\n<p>\u8fd9\u6761\u6307\u4ee4<code class=\"prettyprint\" >add $1000,%eax<\/code> \u5bf9\u5e94\u7684\u673a\u5668\u7801\u662f 05 e8 03 00 00 \uff0c\u6240\u4ee5\u53ea\u9700\u8981\u628a\u8fd9\u4e2a 5 \u4e2a\u5b57\u8282\u7684 \u673a\u5668\u7801 \u63d2\u8fdb\u53bb sum \u51fd\u6570\u7684\u672b\u5c3e\u5c31\u884c\u3002\u901a\u8fc7\u7b26\u53f7\u8868\u627e\u5230 sum \u51fd\u6570\u7684\u4f4d\u7f6e\uff0c\u7136\u540e\u4fee\u6539\uff0c\u5982\u4e0b\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"1004\" height=\"429\" src=\"https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/04\/byxt-3-1.png\" alt=\"\" class=\"wp-image-2233\" srcset=\"https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/04\/byxt-3-1.png 1004w, https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/04\/byxt-3-1-300x128.png 300w, https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/04\/byxt-3-1-768x328.png 768w\" sizes=\"auto, (max-width: 1004px) 100vw, 1004px\" \/><\/figure>\n\n\n\n<p>\u4e0a\u9762\u6211\u662f\u7528 sublime \u52a0\u8fdb\u53bb\u7684\uff0c\u8fd9\u6837\u76f4\u63a5\u8fd0\u884c\u4f1a\u62a5 <code class=\"prettyprint\" >Segmentation fault<\/code> \u9519\u8bef\u3002\u56e0\u4e3a\u8fd8\u6709\u4e00\u4e9b\u5176\u4ed6\u7684\u5730\u65b9\u6ca1\u76f8\u5e94\u6539\u52a8\uff0c\u6211\u4eec\u77e5\u9053 sum \u7b26\u53f7\u6709\u4e2a\u5927\u5c0f\uff0c\u539f\u6765\u662f 0x45 \u5b57\u8282\uff0c\u73b0\u5728\u52a0\u4e86 5 \u4e2a\u5b57\u8282\uff0c\u5e94\u8be5\u8981\u6539\u6210 0x4a\u3002\u9700\u8981\u7528 <code>xelfviewer<\/code> \u627e\u5230\u76f8\u5e94\u7684\u4f4d\u7f6e \u6539\u6210 0x4a\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"561\" src=\"https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/04\/byxt-3-2-1024x561.png\" alt=\"\" class=\"wp-image-2234\" srcset=\"https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/04\/byxt-3-2-1024x561.png 1024w, https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/04\/byxt-3-2-300x164.png 300w, https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/04\/byxt-3-2-768x421.png 768w, https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/04\/byxt-3-2.png 1183w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"417\" height=\"203\" src=\"https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/04\/byxt-3-3.png\" alt=\"\" class=\"wp-image-2235\" srcset=\"https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/04\/byxt-3-3.png 417w, https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/04\/byxt-3-3-300x146.png 300w\" sizes=\"auto, (max-width: 417px) 100vw, 417px\" \/><\/figure>\n\n\n\n<p>\u8fd8\u6709\u4e00\u4e2a\u5730\u65b9\uff0csum \u7b26\u53f7\u662f\u5728 <code class=\"prettyprint\" >.text<\/code> \u6bb5\uff0c <code>.text<\/code> \u6bb5\u4e5f\u6709\u4e00\u4e2a\u5927\u5c0f\uff0c\u4e5f\u8981\u6539\u3002\u539f\u6765\u662f <code>0x1e2<\/code>\uff0c\u8981\u6539\u6210 0x1e7\uff0c\u4f46\u662f .text \u6bb5\u5927\u5c0f\u53d8\u4e86\u4e4b\u540e\uff0c\u4ed6\u4f1a\u6324\u5f00\u5176\u4ed6\u7684\u6bb5\uff0c\u5176\u4ed6\u7684\u6bb5\u7684\u504f\u79fb\u4f4d\u8fd8\u8981\u6539\uff0c\u8fd8\u6709\u5bf9\u9f50\u4e4b\u7c7b\u7684\uff0c\u592a\u9ebb\u70e6\uff0c\u9664\u975e\u6709\u8f6f\u4ef6\u81ea\u52a8\u5904\u7406\u504f\u79fb\u4f4d\uff0c\u8981\u4e0d\u592a\u96be\u641e\u4e86\u3002<\/p>\n\n\n\n<p>\u6240\u4ee5\u4e0d\u80fd\u52a0\u6307\u4ee4\uff0c\u53ea\u80fd\u518d\u7814\u7a76\uff0c\u628a\u67d0\u4e9b\u6307\u4ee4\u66ff\u6362\u6389\uff0c\u4e0d\u6539\u53d8\u5927\u5c0f\u3002<\/p>\n\n\n\n<p>\u6362\u4e00\u4e2a\u601d\u8def\uff0c\u76f8\u5bf9\u6b66\u529b\u503c\u4e0d\u592a\u597d\u641e\uff0c\u76f4\u63a5\u8fd4\u56de\u7edd\u5bf9\u7684\u6b66\u529b\u503c\uff0c\u76f4\u63a5\u8fd4\u56de \u6b66\u529b\u503c 1000\u3002\u76f8\u5e94\u7684\u6c47\u7f16\u6307\u4ee4\u662f <code class=\"prettyprint\" >mov $1000,%eax<\/code> \uff0c\u673a\u5668\u7801\u662f b8 e8 03 00 00\uff0c\u8fd9\u6837\u53ea\u9700\u8981\u627e\u5230 \u6b63\u597d\u662f 5\u4e2a\u5b57\u8282\u7684 \u6307\u4ee4\uff0c\u66ff\u6362\u6210 b8 e8 03 00 00 \u5373\u53ef\uff0c\u8fd9\u6837\u5c31\u4e0d\u4f1a\u6539\u53d8\u5927\u5c0f\u3002<\/p>\n\n\n\n<p><code class=\"prettyprint\" >objdump -d main<\/code> \u53ef\u4ee5\u770b\u5230\u4ee5\u4e0b\u56fe\u7247\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"523\" height=\"452\" src=\"https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/04\/byxt-3-4.png\" alt=\"\" class=\"wp-image-2231\" srcset=\"https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/04\/byxt-3-4.png 523w, https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/04\/byxt-3-4-300x259.png 300w\" sizes=\"auto, (max-width: 523px) 100vw, 523px\" \/><\/figure>\n\n\n\n<p>\u4e3a\u4e86\u65b9\u4fbf\u64cd\u4f5c\uff0c\u76f4\u63a5\u5728 sum \u51fd\u6570\u7684\u5165\u53e3\u5c31\u8fd4\u56de 1000\uff0c\u6240\u4ee5\u8981\u628a \u6700\u540e\u7684\u4e24\u6761\u6307\u4ee4 <code class=\"prettyprint\" >5d<\/code> <code>c3<\/code> \u5f80\u524d\u9762\u79fb\u52a8 \u3002\u6240\u4ee5\u4e00\u5171\u662f b8 e8 03 00 00 \u52a0\u4e0a 5d c3 \uff0c\u4e00\u5171 7\u4e2a\u5b57\u8282\uff0c\u521a\u521a\u53ef\u4ee5\u524d\u9762\u7684 \u4e24\u6761\u6307\u4ee4 48 89 e5 \u8ddf 48 89 7d 48 \uff0c\u5982\u679c\u4e0d\u591f\u5bf9\u6d88\uff0c\u53ef\u4ee5\u7528 <code>nop<\/code> \u6307\u4ee4 90 \u6765\u5360\u4f4d\u3002<\/p>\n\n\n\n<p>\u7531\u4e8e \u6211\u7684 ubuntu \u7684 exit status \u6700\u5927 \u662f 232\uff0cecho $? \u6700\u5927\u53ea\u663e\u793a 232 \uff0c\u6240\u4ee5\u8fd8\u662f\u4e0d\u7528 1000 \u4e86\uff0c\u7528 5 \u5427\uff0c\u673a\u5668\u7801\u662f b8 05 00 00 00 \uff0c\u8fd0\u884c\u60c5\u51b5\u5982\u4e0b\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"723\" height=\"171\" src=\"https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/04\/byxt-3-5.png\" alt=\"\" class=\"wp-image-2232\" srcset=\"https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/04\/byxt-3-5.png 723w, https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/04\/byxt-3-5-300x71.png 300w\" sizes=\"auto, (max-width: 723px) 100vw, 723px\" \/><\/figure>\n\n\n\n<p>\u9006\u5411\u6ca1\u6709\u95ee\u9898\uff0c\u786e\u5b9e\u8fd4\u56de 5\uff0c\u4e5f\u6ca1\u6709\u62a5 <code class=\"prettyprint\" >Segmentation fault<\/code> \u9519\u8bef\uff0c\u56e0\u4e3a\u6211\u4eec\u6ca1\u6709\u6539\u52a8\u5927\u5c0f\u3002<\/p>\n\n\n\n<p>\u6240\u4ee5\u5982\u679c\u52a0\u673a\u5668\u7801 \u5f71\u54cd\u7684\u5730\u65b9\u5f88\u591a\uff0c\u6240\u4ee5\u901a\u5e38\u9006\u5411\u4e3a\u4e86\u65b9\u4fbf\uff0c\u4f1a\u7528\u540c\u6837\u5927\u5c0f\u7684\u6307\u4ee4\u66ff\u6362\u67d0\u4e00\u6761\u6307\u4ee4\u3002\u8fd9\u6837\u5927\u5c0f\u4e0d\u53d8\u3002<\/p>\n\n\n\n<p>\u4e0a<\/p>\n\n\n\n<p>\u4e0a\u9762\u8fd9\u4e9b \u6c47\u7f16\u6307\u4ee4\uff0c\u5982\u679c\u4f60\u4e0d\u592a\u719f\u6089\uff0c\u53ef\u4ee5\u770b\u300a\u6c47\u7f16\u8bed\u8a00\u57fa\u4e8ex86\u300b\u3002AT&amp;T \u8ddf intel \u98ce\u683c\u7684\u6c47\u7f16\u5dee\u4e0d\u591a\u3002<\/p>\n\n\n\n<p>\u5b9e\u9645\u4e0a\uff0c\u73b0\u4ee3\u8f6f\u4ef6\u5f00\u53d1\uff0c\u57fa\u672c\u4e0d\u4f1a\u76f4\u63a5\u5199\u673a\u5668\u7801\u6765\u5b9e\u73b0\u4e00\u4e2a\u5927\u529f\u80fd\uff0c\u673a\u5668\u7801\u636e\u6211\u4e86\u89e3\uff0c\u53ea\u6709\u505a\u9006\u5411 \u7834\u89e3\u7684\u5de5\u7a0b\u5e08\u624d\u4f1a\u7528\u4e00\u4e0b\uff0c\u4f46\u4e5f\u662f\u4e00\u5c0f\u90e8\u5206\u529f\u80fd\u7528\u6c47\u7f16\u8fdb\u884c\u8df3\u8f6c\u6216\u8005\u6293\u53d6\u6570\u636e\uff0c\u8df3\u8f6c\u5230\u7684\u5730\u65b9\u662f\u7528\u5176\u4ed6\u9ad8\u7ea7\u8bed\u8a00\u5199\u7684\u529f\u80fd\u3002<\/p>\n\n\n\n<p>\u56e0\u4e3a\u505a\u9006\u5411\uff0c\u6ca1\u6709\u6e90\u4ee3\u7801\uff0c\u4e0d\u65b9\u4fbf\u8fdb\u884c\u7f16\u8bd1\u94fe\u63a5\uff0c\u53ea\u80fd\u5199\u673a\u5668\u7801\u6765\u505a\u8df3\u8f6c\uff0c\u5e72\u4e00\u4e9b\u5176\u4ed6\u4e8b\u60c5\u3002<\/p>\n\n\n\n<p>\u505aSMID \u4f18\u5316\u7684\u65f6\u5019\uff0c\u7528\u7684\u6700\u591a\u7684\u4e5f\u662f\u6c47\u7f16\u6307\u4ee4\uff0c\u800c\u4e0d\u662f\u673a\u5668\u7801\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-css-opacity\"\/>\n\n\n\n<p>\u7531\u4e8e\u7b14\u8005\u7684\u6c34\u5e73\u6709\u9650\uff0c 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