{"id":2253,"date":"2022-04-15T06:00:14","date_gmt":"2022-04-14T22:00:14","guid":{"rendered":"https:\/\/www.xianwaizhiyin.net\/?p=2253"},"modified":"2022-06-11T02:00:17","modified_gmt":"2022-06-10T18:00:17","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%e9%93%be%e6%8e%a5%e5%99%a8%e5%88%86%e6%9e%90","status":"publish","type":"post","link":"https:\/\/www.xianwaizhiyin.net\/?p=2253","title":{"rendered":"\u300a\u7f16\u8bd1\u7cfb\u7edf-\u81ea\u5e95\u5411\u4e0a\u7814\u7a76\u65b9\u6cd5\u300b\u94fe\u63a5\u5668\u5206\u6790"},"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>\u4e4b\u524d\u7684<a href=\"https:\/\/www.xianwaizhiyin.net\/?p=2238\">\u6587\u7ae0<\/a>\u5df2\u7ecf\u8bb2\u89e3\u4e86\u5982\u4f55\u5728 <code class=\"prettyprint\" >clion<\/code> \u91cc\u9762\u8c03\u8bd5 <code>ld<\/code> \u94fe\u63a5\u5668\uff0c\u672c\u6587\u4e0d\u6253\u7b97\u8bb2 \u94fe\u63a5\u5668\u7684\u6e90\u7801\u903b\u8f91\uff0c\u56e0\u4e3a\u6211\u4e5f\u6ca1\u770b\uff0c\u6211\u4e5f\u4e0d\u4f1a\uff0c\u672c\u6587\u4e3b\u8981\u8bb2 \u94fe\u63a5\u5668 \u4e3b\u8981\u505a\u4e86\u4ec0\u4e48\u4e8b\u60c5\u3002<\/p>\n\n\n\n<p>\u7b2c\u4e00\u4ef6\u4e8b\uff0c\u4fee\u6b63\u5730\u5740\u3002\u6211\u4eec\u77e5\u9053 <code class=\"prettyprint\" >gcc<\/code> \u628a <code>main.c<\/code> \u7f16\u8bd1\u6210 <code>main.o<\/code> \u7684\u65f6\u5019\uff0c\u662f\u6ca1\u6709\u5f15\u7528\u5176\u4ed6\u6587\u4ef6\uff0c\u547d\u4ee4\u5982\u4e0b\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code class=\"prettyprint\" >gcc -c -o main.o main.c<\/code><\/pre>\n\n\n\n<p>\u6211\u4eec\u8fd8\u77e5\u9053 \uff0c<code class=\"prettyprint\" >main.c<\/code> \u91cc\u9762\u662f\u8c03\u7528\u4e86 sum \u51fd\u6570\u7684\uff0c\u7ffb\u8bd1\u6210 call \u6307\u4ee4\uff0c\u80af\u5b9a\u9700\u8981\u4e00\u4e2a\u53c2\u6570\uff0c\u8fd9\u4e2a\u53c2\u6570\u51b3\u5b9a\u6307\u4ee4\u8df3\u5230\u54ea\u91cc\u3002\u6211\u4eec\u7528 <code>objdump<\/code> \u6253\u5370\u4e00\u4e0b <code>main.o<\/code> \u7684\u5185\u5bb9\u3002\u5982\u4e0b\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"725\" height=\"343\" src=\"https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/04\/bixt-5-1.png\" alt=\"\" class=\"wp-image-2257\" srcset=\"https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/04\/bixt-5-1.png 725w, https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/04\/bixt-5-1-300x142.png 300w\" sizes=\"auto, (max-width: 725px) 100vw, 725px\" \/><\/figure>\n\n\n\n<p>\u53ef\u4ee5\u770b\u5230 <code class=\"prettyprint\" >call<\/code> \u6307\u4ee4\u7684\u53c2\u6570\u5168\u662f 0\uff0c\u8fd9\u4e2a\u4e25\u683c\u6765\u8bf4\uff0c\u4e0d\u662f\u53c2\u6570\uff0c\u800c\u662f<strong>\u64cd\u4f5c\u6570<\/strong>\uff0c\u4e00\u4e9b\u6c47\u7f16\u4e66\u7c4d\u8bb2\u7684\u64cd\u4f5c\u6570\uff0c\u4f46\u662f\u5728\u672c\u6587\u91cc\u6211\u53eb\u505a\u53c2\u6570\uff0c\u65b9\u4fbf\u7406\u89e3\u3002<\/p>\n\n\n\n<p>\u8fd9\u91cc <code class=\"prettyprint\" >gcc<\/code> \u7f16\u8bd1\u7684\u65f6\u5019\uff0c\u4ed6\u627e\u4e0d\u5230 sum \u51fd\u6570\u7684\u5b9a\u4e49\u7684\u4f4d\u7f6e\uff0c\u5c31\u4f1a \u7528 0 \u586b\u5145\uff0c\u5148\u5360\u4e2a\u4f4d\u7f6e\uff0c\u540e\u9762\u8ba9\u94fe\u63a5\u5668\u6765\u628a\u8fd9\u4e2a\u5730\u5740\u4fee\u6b63\u3002\u53ea\u8981 <code>main.c<\/code> \u91cc\u9762\u58f0\u660e\u4e86 sum \u51fd\u6570\uff0c\u7f16\u8bd1\u7684\u65f6\u5019\u5c31\u4e0d\u4f1a\u62a5\u9519\uff0c\u8fd9\u91cc\u5982\u679c\u6211\u628a sum \u7684\u58f0\u660e\u53bb\u6389\uff0c\u5982\u4e0b\uff0c\u7f16\u8bd1\u5c31\u4f1a\u62a5\u9519\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"732\" height=\"365\" src=\"https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/04\/bixt-5-2.png\" alt=\"\" class=\"wp-image-2258\" srcset=\"https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/04\/bixt-5-2.png 732w, https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/04\/bixt-5-2-300x150.png 300w\" sizes=\"auto, (max-width: 732px) 100vw, 732px\" \/><\/figure>\n\n\n\n<p>\u4e0a\u56fe\u6ca1\u6709\u62a5\u9519\uff0c\u53ea\u662f\u62a5\u4e86\u4e2a warning\uff0c\u7b97\u4e86\uff0c\u4e0d\u7ba1\u4ed6\uff0c\u53ea\u662f\u6f14\u793a\u4e00\u4e0b\u3002\u3001<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p>google_ads_content<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p>\u56de\u6765\u4e3b\u9898\uff0c\u94fe\u63a5\u5668\u4f1a\u5bf9\u8fd9\u4e9b 00 00 00 00 \u7684\u5730\u5740\u8fdb\u884c\u4fee\u6b63\uff0c\u6211\u4eec \u7528 <code class=\"prettyprint\" >objdump -d main<\/code> \u6765\u770b\u770b\u4fee\u6b63\u4e4b\u540e\u7684\u6548\u679c\uff0c\u5982\u4e0b\u56fe\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"806\" height=\"369\" src=\"https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/04\/bixt-5-3.png\" alt=\"\" class=\"wp-image-2259\" srcset=\"https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/04\/bixt-5-3.png 806w, https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/04\/bixt-5-3-300x137.png 300w, https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/04\/bixt-5-3-768x352.png 768w\" sizes=\"auto, (max-width: 806px) 100vw, 806px\" \/><\/figure>\n\n\n\n<p>\u4ece\u4e0a\u56fe\u53ef\u4ee5\u770b\u5230\uff0c\u94fe\u63a5\u5668\u751f\u6210\u7684 main \u8fdb\u884c\u4e86\u5730\u5740\u4fee\u6b63\uff0c\u53d8\u6210\u4e86 08 \uff0c\u5f53\u524d\u6307\u4ee4 \u504f\u79fb 8 \u5b57\u8282 \u6b63\u597d\u5c31\u662f sum \u51fd\u6570\u7684\u5165\u53e3\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-css-opacity\"\/>\n\n\n\n<p>\u4e0b\u9762\u8bb2\u4e00\u4e0b <code class=\"prettyprint\" >ld<\/code> \u94fe\u63a5\u5668\u662f\u6839\u636e\u4ec0\u4e48\u89c4\u5219\u6765\u4fee\u6b63\u5730\u5740\uff0c\u4ee5\u53ca\u6211\u4eec\u7ecf\u5e38\u9047\u5230\u7684 undefined reference to xxx \u662f\u4ec0\u4e48\u610f\u601d\u3002<\/p>\n\n\n\n<p>\u4e0a\u6587\u8bf4\u5230\uff0ccall \u4e4b\u524d\u7684\u53c2\u6570\u662f 00 00 00 00 \uff0c4\u4e2a\u5b57\u8282\u7684 00\uff0c\u80af\u5b9a\u6709\u4e2a\u5730\u65b9\uff0c\u6216\u8005\u8868\uff0c\u6807\u660e\u4e86 sum \u8fd9\u4e2a\u7b26\u53f7\uff0c\u5bf9\u5e94\u7740\u8fd94\u4e2a\u5b57\u8282\u7684\u4f4d\u7f6e\u3002\u8fd9\u4e2a\u4fe1\u606f \u80af\u5b9a\u5728 <code class=\"prettyprint\" >main.o<\/code> \u91cc\u9762\uff0c\u56e0\u4e3a\u53ea\u6709\u8fd9\u6837\uff0c\u94fe\u63a5\u5668\u624d\u80fd\u627e\u5230\u8fd9\u4e2a\u4f4d\u7f6e\u8fdb\u884c\u66ff\u6362\u3002<\/p>\n\n\n\n<p>\u7528 xelfviewer.exe \u6253\u5f00 <code class=\"prettyprint\" >main.o<\/code> \u8fdb\u884c\u5206\u6790\u3002\u4e3a\u4e86\u65b9\u4fbf\u8bfb\u8005\u5bf9\u7740\uff0c<code>main.o<\/code> \u4e0b\u8f7d\u5730\u5740 <a href=\"https:\/\/pan.baidu.com\/s\/1XZEialcLioN4XgneJV8ZtA\">\u767e\u5ea6\u7f51\u76d8<\/a> \uff0c\u63d0\u53d6\u7801\uff1aq2sy \u3002<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" src=\"https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/04\/bixt-5-4.png\" alt=\"\"\/><\/figure>\n\n\n\n<p>\u4ece\u4e0a\u56fe\u53ef\u4ee5\u770b\u5230\uff0c<code class=\"prettyprint\" >.data<\/code> \u8fd9\u4e2a\u6bb5\u6709 12\u4e2a\u5b57\u8282\uff0c\u5c31\u662f array \u6570\u7ec4\u7684\u5185\u5bb9\uff0c\u4e0d\u8fc7\u8fd9\u4e2a\u4e0d\u662f\u672c\u6587\u91cd\u70b9\uff0c\u7ee7\u7eed\u770b\u4e0b\u56fe\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" src=\"https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/04\/bixt-5-5.png\" alt=\"\"\/><\/figure>\n\n\n\n<p>\u4e0a\u56fe\u4e2d\u6211\u5708\u51fa\u6765 3 \u4e2a\u7b26\u53f7\uff0c<code class=\"prettyprint\" >array<\/code>\uff0c<code>main<\/code>\uff0c<code>sum<\/code>\uff0c\u524d\u9762\u4e24\u4e2a\u7b26\u53f7\uff0c\u90fd\u80fd\u6839\u636e <code>st_shndx<\/code>\uff0c<code>st_value<\/code>\uff0c<code>st_size<\/code> \u627e\u5230\u5728 <code>main.o<\/code> \u6587\u4ef6\u7684\u504f\u79fb\u4f4d\u3002\u552f\u72ec\u8fd9\u4e2a <code>sum<\/code> \u7b26\u53f7\uff0c\u5168\u90fd\u662f 0 \u3002<\/p>\n\n\n\n<p>\u4fee\u6539\u5730\u5740\uff0c\u9700\u8981\u7528\u5230\u4e00\u4e2a \u91cd\u5b9a\u4f4d\u6bb5\uff0c\u5982\u4e0b\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" src=\"https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/04\/bixt-5-6.png\" alt=\"\"\/><\/figure>\n\n\n\n<p>\u8fd9\u4e2a\u6bb5\u540d\u79f0 \u662f <code class=\"prettyprint\" >.rela.text<\/code> \uff0c\u5168\u79f0\uff0cRelocation text\uff0c\u91cd\u5b9a\u4f4d\u8868\uff0c\u4f5c\u7528\u4e8e\u524d\u9762\u7684 <code>.text<\/code> \u6bb5\uff0c<code>.text<\/code> \u6bb5\u54ea\u4e9b\u7b26\u53f7\u8981\u91cd\u5b9a\u4f4d\uff0c\u90fd\u4f1a\u653e\u5230 <code>.rela.text<\/code> \u6bb5\u3002\u4ece <code>sh_info<\/code> \u5b57\u6bb5\u4e5f\u80fd\u770b\u51fa\uff0c\u8fd9\u4e2a\u6bb5\u662f\u4f5c\u7528\u4e8e <code>.text<\/code> \u6bb5\u7684\uff0c <code>sh_info<\/code> \u662f\u8981\u4f5c\u7528\u5230\u7684\u6bb5\u7684\u4e0b\u6807\u3002<code>.rela.text<\/code> \u6bb5\u7684 <code>sh_info<\/code> \u662f 1\uff0c\u8868\u660e\u4f5c\u7528\u4e8e\u4e0b\u6807\u4e3a 1\u7684\u6bb5\u3002<code>.text<\/code> \u6bb5\u7684\u4e0b\u6807\u5c31\u662f 1\u3002<\/p>\n\n\n\n<p>\u91cd\u5b9a\u4f4d\u8868 \u91cc\u9762\u6709\u5f88\u591a\u4e2a \u5143\u7d20\uff0c\u7ed3\u6784\u4f53\u662f <code class=\"prettyprint\" >Elf64_Rel<\/code>\uff0c<code>\/usr\/include\/elf.h<\/code>\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code class=\"prettyprint\" >typedef struct\n{\n  Elf64_Addr    r_offset;       \/* Address *\/\n  Elf64_Xword   r_info;         \/* Relocation type and symbol index *\/\n  Elf64_Sxword  r_addend;       \/* Addend *\/\n} Elf64_Rela;<\/code><\/pre>\n\n\n\n<p>\u8fd9\u4e2a\u7ed3\u6784\u4f53\u662f 24 \u4e2a\u5b57\u8282\u3002\u5982\u4e0b\u56fe\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" src=\"https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/04\/bixt-5-7.png\" alt=\"\"\/><\/figure>\n\n\n\n<p>\u4ece\u4e0a\u56fe\u53ef\u4ee5\u770b\u5230\uff0c\u4e00\u5171\u4e24\u4e2a\u5143\u7d20\uff0c\u4e5f\u5c31\u662f 48\u5b57\u8282\uff0c\u8ddf \u6bb5\u8868\u91cc\u9762\u7684 <code class=\"prettyprint\" >sh_size<\/code> \u5b57\u6bb5\u7684\u503c\u543b\u5408\uff0c <code>sh_size<\/code> \u662f 0x30 \u3002\u63d0\u9192\u4e00\u4e0b <code>Elf64_Rela<\/code> \u7ed3\u6784\u4f53\u53ea\u6709 3\u4e2a\u5b57\u6bb5\uff0c\u4e0a\u56fe\u4e2d\u7684 <code>Sym<\/code> \u8ddf <code>Type<\/code> \u5b57\u6bb5\u662f xelfviewer.exe \u81ea\u52a8\u7b97\u51fa\u6765\uff0c\u65b9\u4fbf\u4f60\u67e5\u770b\u7684\u3002<\/p>\n\n\n\n<p>\u8fd9\u4e24\u884c\u6570\u636e\uff0c\u5b9e\u9645\u4e0a\u662f <code class=\"prettyprint\" >array<\/code> \u8ddf <code>sum<\/code> \u7b26\u53f7\u7684\u91cd\u5b9a\u4f4d\u4fe1\u606f\u3002<code>array<\/code> \u5148\u4e0d\u7ba1\u4ed6\uff0c\u672c\u6587\u91cd\u70b9\u8bb2\u89e3 <code>sum<\/code> \u7b26\u53f7\u7684\u91cd\u5b9a\u4f4d\u3002<\/p>\n\n\n\n<p>\u5148\u8bb2\u89e3 <code class=\"prettyprint\" >r_info<\/code> \u5b57\u6bb5\uff0c\u56e0\u4e3a\u8fd9\u4e2a\u5b57\u6bb5\u7279\u522b\u91cd\u8981\uff0c\u540e\u9762\u7684 <code>Sym<\/code> \u8ddf <code>Type<\/code> \u5b57\u6bb5\u5c31\u662f\u4ece r_info \u62c6\u51fa\u6765\u7684\uff0c\u524d32\u4f4d\u662f <code>Sym<\/code> \uff0c\u540e32\u4f4d\u662f <code>Type<\/code>\u3002<code>Sym<\/code> \u662f symbol \u7b26\u53f7\u7684\u7f29\u5199\u3002\u6240\u4ee5 <code>sym<\/code> 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\u5b57\u6bb5\u7684\u542b\u4e49\uff0c\u770b\u540d\u5b57\u5c31\u77e5\u9053\u662f\u504f\u79fb\u4f4d\uff0c\u90a3\u662f\u8c01\u7684\u504f\u79fb\u4f4d\uff0c\u662f <code>.text<\/code> \u5b57\u6bb5\u7684\u504f\u79fb\u4f4d\uff0c <code>.text<\/code> \u5b57\u6bb5\u5165\u53e3 \u52a0\u4e0a <code>r_offset<\/code> \u5c31\u662f\u8981\u4fee\u6b63\u7684\u5185\u5bb9\u7684\u4f4d\u7f6e\uff0c\u6211\u4eec\u77e5\u9053 .text \u7684 <code>sh_offset<\/code> \u662f 0x40\uff0c\u73b0\u5728\u52a0\u4e0a 0x15\uff0c\u4e5f\u5c31\u662f 0x55\uff0c\u7528 notepad++ \u770b 0x50 \u7684\u4f4d\u7f6e\u5185\u5bb9\uff0c\u5982\u4e0b\u56fe\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"992\" height=\"330\" src=\"https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/04\/bixt-5-8.png\" alt=\"\" class=\"wp-image-2260\" srcset=\"https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/04\/bixt-5-8.png 992w, 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