{"id":2219,"date":"2022-04-14T19:27:10","date_gmt":"2022-04-14T11:27:10","guid":{"rendered":"https:\/\/www.xianwaizhiyin.net\/?p=2219"},"modified":"2022-06-11T02:02:17","modified_gmt":"2022-06-10T18:02:17","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%8belf%e7%ac%a6%e5%8f%b7%e6%ae%b5","status":"publish","type":"post","link":"https:\/\/www.xianwaizhiyin.net\/?p=2219","title":{"rendered":"\u300a\u7f16\u8bd1\u7cfb\u7edf-\u81ea\u5e95\u5411\u4e0a\u7814\u7a76\u65b9\u6cd5\u300bELF\u7b26\u53f7\u6bb5"},"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>\u672c\u6587\u6765\u8bb2\u89e3 ELF \u91cc\u9762\u7684 \u7b26\u53f7\u6bb5 <code class=\"prettyprint\" >symtab<\/code>\uff0c\u4e5f\u53ef\u4ee5\u53eb \u7b26\u53f7\u8868\uff0c\u56e0\u4e3a\u76f8\u5bf9\u4e8e <strong>\u6bb5\u8868<\/strong> \u6765\u8bf4\uff0c<code>symtab<\/code> \u4ed6\u662f\u4e00\u4e2a\u6bb5\u3002\u4f46\u662f\u5bf9\u4e8e \u5404\u4e2a\u7b26\u53f7\u9879 \u6765\u8bf4\uff0c<code>symtab<\/code> \u4ed6\u662f\u4e00\u4e2a\u8868\u3002\u6240\u4ee5\u628a\u4ed6\u53eb\u6210 \u662f\u6bb5 \u6216\u8005\u662f\u8868\u90fd\u53ef\u4ee5\u3002<\/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-css-opacity\"\/>\n\n\n\n<p>\u9996\u5148\u8bb2\u4e00\u4e0b\u4ec0\u4e48\u662f\u7b26\u53f7\uff0c\u5176\u5b9e \u7b26\u53f7 \u6709\u65f6\u5019\u4e5f\u53eb token\uff0c\u6216\u8005 ID\uff0c\u662f\u7f16\u8bd1\u7cfb\u7edf\u5728\u505a \u8bcd\u6cd5\u5206\u6790\u7684\u65f6\u5019 \u751f\u6210\u7684\u3002\u4e00\u4e2a\u51fd\u6570\uff0c\u4e00\u4e2a\u53d8\u91cf\u540d\uff0c\u90fd\u662f \u7b26\u53f7\uff0c\u4f8b\u5982 main() \u51fd\u6570\uff0csum \u51fd\u6570\uff0carray \u6570\u7ec4\uff0c\u8fd9\u4e9b\u90fd\u662f\u7b26\u53f7\u3002\u8fd8\u662f\u4ee5\u4e4b\u524d\u7684 main \u9879\u76ee\u505a\u8bb2\u89e3\u3002\u7528 <code class=\"prettyprint\" >xelfviewer<\/code> \u6765\u5206\u6790\uff0c\u5982\u4e0b\u56fe\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"359\" src=\"https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/04\/byxt-2-1-1024x359.png\" alt=\"\" class=\"wp-image-2223\" srcset=\"https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/04\/byxt-2-1-1024x359.png 1024w, https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/04\/byxt-2-1-300x105.png 300w, https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/04\/byxt-2-1-768x269.png 768w, https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/04\/byxt-2-1-1536x538.png 1536w, https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/04\/byxt-2-1.png 1673w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p>\u5982\u4e0a\u56fe\u6240\u793a\uff0c\u7b2c 25 \u4e2a\u6bb5\u5c31\u662f\u7b26\u53f7\u8868\uff0c\u4e0a\u56fe\u6709\u51e0\u4e2a\u91cd\u70b9\uff0c\u7b26\u53f7\u8868\u662f\u4ece main \u7684\u7b2c 0x1048 \u5b57\u8282\u5f00\u59cb\u89e3\u6790\u7684\uff0c\u8fd8\u6709\u4e00\u4e2a <code class=\"prettyprint\" >sh_entsize<\/code> <strong>\u91cd\u70b9<\/strong>\u5b57\u6bb5\u662f 0x18 \u5b57\u8282\u3002\u7b26\u53f7\u8868\u91cc\u9762\u662f\u6709\u591a\u4e2a\u7b26\u53f7\u7684\uff0c\u6bcf\u4e2a\u7b26\u53f7\u5360 0x18 \u5b57\u8282\u3002\u7b26\u53f7\u5176\u5b9e\u4e5f\u662f\u6709\u7ed3\u6784\u4f53\u5b9a\u4e49\u7684\uff0c\u4ee3\u7801\u5982\u4e0b\uff0c\u5728 <code>\/usr\/include\/elf.h<\/code> \u6587\u4ef6\u91cc\u9762\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code class=\"prettyprint\" >typedef struct\n{\n  Elf64_Word    st_name;        \/* Symbol name (string tbl index) *\/\n  unsigned char st_info;        \/* Symbol type and binding *\/\n  unsigned char st_other;       \/* Symbol visibility *\/\n  Elf64_Section st_shndx;       \/* Section index *\/\n  Elf64_Addr    st_value;       \/* Symbol value *\/\n  Elf64_Xword   st_size;        \/* Symbol size *\/\n} Elf64_Sym;<\/code><\/pre>\n\n\n\n<p><code class=\"prettyprint\" >Elf64_Sym<\/code> \u8fd9\u4e2a\u7ed3\u6784\u4f53\u5c31\u662f 0x18 \u5b57\u8282\u3002\u73b0\u5728\u5c31\u6765\u770b\u770b \u7b26\u53f7\u8868\u91cc\u9762\u90fd\u6709\u54ea\u4e9b\u7b26\u53f7\uff0c\u70b9\u51fb <code>xelfviewer<\/code> \u8f6f\u4ef6\u5de6\u8fb9 \u7684 Symbol table \u5c31\u884c\uff0c\u5982\u4e0b\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"483\" src=\"https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/04\/byxt-2-2-1024x483.png\" alt=\"\" class=\"wp-image-2224\" srcset=\"https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/04\/byxt-2-2-1024x483.png 1024w, https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/04\/byxt-2-2-300x142.png 300w, https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/04\/byxt-2-2-768x363.png 768w, https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/04\/byxt-2-2.png 1472w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p>\u4ece\u4e0a\u56fe\u53ef\u4ee5\u770b\u5230\uff0c\u6709 array\uff0c sum \u8fd9\u4e9b\u7b26\u53f7\u3002\u4e0a\u9762\u8fd9\u4e2a\u8868\u683c\u5c31\u662f\u7528 <code class=\"prettyprint\" >Elf64_Sym<\/code> \u7ed3\u6784\u4f53\u89e3\u6790\u5904\u7406\u7684\uff0c\u6240\u6709\u5b57\u6bb5\u90fd\u80fd\u5bf9\u5f97\u4e0a\u3002\u672c\u6587\u53ea\u6311\u4e00\u4e9b\u91cd\u70b9\u7684\u5b57\u6bb5\u6765\u8bb2\u3002<\/p>\n\n\n\n<p>1\uff0c<code class=\"prettyprint\" >st_name<\/code>\uff0c\u8fd9\u4e2a\u662f\u540d\u5b57\uff0c\u4f46\u662f\u5b58\u7684\u4e0d\u662f\u5b57\u7b26\u4e32\uff0c\u800c\u662f\u504f\u79fb\u503c\uff0c\u8fd9\u91cc\u504f\u79fb\u503c\u4e0d\u662f\u4ece <code>shstrtab<\/code> \u6bb5\u627e\u4e86\uff0c\u800c\u662f\u4ece <code>strtab<\/code> \u6bb5\u627e\u3002<code>main<\/code> \u91cc\u9762\u6709\u4e24\u4e2a\u5b57\u7b26\u4e32\u8868\u3002<\/p>\n\n\n\n<p>2\uff0c<code class=\"prettyprint\" >st_size<\/code>\uff0c\u8fd9\u4e2a\u5b57\u6bb5\u4ee3\u8868\u7b26\u53f7\u6709\u591a\u5927\uff0carray \u662f\u4e00\u4e2a <code>int<\/code> \u6570\u7ec4\uff0c\u67093\u4e2a\u5143\u7d20\uff0c\u6240\u4ee5\u4e00\u517112\u5b57\u8282\uff0c\u4e5f\u5c31\u662f 0xc\u3002\u5982\u679c\u7b26\u53f7\u662f\u4e00\u4e2a\u51fd\u6570\uff0c\u90a3\u8fd9\u4e2a <code>st_size<\/code> \u5c31\u662f\u51fd\u6570\u5185\u7684\u5168\u90e8\u6307\u4ee4\u52a0\u4e00\u8d77\u4e00\u5171\u6709\u591a\u5927\u3002\u4f8b\u5982 sum \u51fd\u6570\u662f 0x45 \u5b57\u8282\u5927\u5c0f\u3002<\/p>\n\n\n\n<p>3\uff0c<code class=\"prettyprint\" >st_shndx<\/code>\uff0c\u770b\u5230 \u5e26 <code>ndx<\/code> \u7684\u4e1c\u897f\uff0c\u5c31\u8981\u4e0b\u610f\u8bc6\u60f3\u5230\uff0c\u8fd9\u662f\u4e00\u4e2a\u4e0b\u6807\u503c\uff0c\u4e5f\u5c31\u662f\u7b26\u53f7\u6240\u5728\u7684\u6bb5\u3002<\/p>\n\n\n\n<p>4\uff0c<code class=\"prettyprint\" >st_value<\/code>\uff0c\u7b26\u53f7\u7684\u503c\u3002<\/p>\n\n\n\n<p>\u73b0\u5728\u5c31\u7528 <code class=\"prettyprint\" >array<\/code> \u7b26\u53f7\u6765\u8bb2\u89e3\u4e00\u4e0b <code>st_shndx<\/code> \u5b57\u6bb5\u7684\u5177\u4f53\u542b\u4e49\uff0c\u9996\u5148 <code>array<\/code> \u7b26\u53f7 \u7684 <code>st_shndx<\/code> \u662f 0x16 \uff08\u6ce8\u610f16\u8fdb\u5236\u7684\uff09\uff0c\u4e5f\u5c31\u662f\u7b2c 22 \u4e2a\u6bb5\uff0c\u5982\u4e0b\u56fe\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"405\" src=\"https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/04\/byxt-2-3-1024x405.png\" alt=\"\" class=\"wp-image-2225\" srcset=\"https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/04\/byxt-2-3-1024x405.png 1024w, https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/04\/byxt-2-3-300x119.png 300w, https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/04\/byxt-2-3-768x304.png 768w, https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/04\/byxt-2-3-1536x607.png 1536w, https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/04\/byxt-2-3.png 1665w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p>\u4ece\u4e0a\u56fe\u53ef\u4ee5\u770b\u5230\uff0c <code class=\"prettyprint\" >array<\/code> \u7b26\u53f7\u6240\u5728\u7684\u6bb5\u662f <code>.data<\/code>\uff0c\u8fd9\u91cc\u8bb2\u4e00\u4e2a\u6269\u5c55\u77e5\u8bc6\uff0c\u5168\u5c40\u53d8\u91cf\u8ddf\u9759\u6001\u53d8\u91cf\u4e00\u822c\u90fd\u653e\u5728\u8fd9\u4e2a <code>.data<\/code> \u6bb5\u91cc\u9762\uff0c\u672a\u521d\u59cb\u5316\u7684\u4f1a\u653e\u5230 <code>.bss<\/code> \u6bb5\u3002<\/p>\n\n\n\n<p>\u7136\u540e <code class=\"prettyprint\" >array<\/code> \u7b26\u53f7 \u7684 <code>st_value<\/code> \u5b57\u6bb5\u7684\u503c\u662f 0x201010\uff0c\u8fd9\u4e2a\u662f\u91cd\u70b9\uff0c\u5982\u679c\u6211\u4eec\u60f3\u9006\u5411\u4fee\u6539 array \u6570\u7ec4\u7684\u5185\u5bb9\uff0c\u5fc5\u987b\u901a\u8fc7 <code>st_value<\/code> \u627e\u5230\u8fd9\u4e2a\u6570\u7ec4\u5728main\u6587\u4ef6\u4e2d\u7684\u5b58\u50a8\u4f4d\u7f6e\u3002\u4f46\u662f \u8fd9\u4e2a 0x201010 \u80af\u5b9a\u4e0d\u662f\u504f\u79fb\u4f4d\uff0c\u6574\u4e2a main \u6587\u4ef6\u90fd\u6ca1\u8fd9\u4e48\u5927\uff0c\u90a3 0x201010 \u662f\u4ec0\u4e48\u5462\uff1f<\/p>\n\n\n\n<p>\u9996\u5148 array \u7b26\u53f7\u7684\u5185\u5bb9\uff0c\u662f\u5728 <code class=\"prettyprint\" >.data<\/code> \u6bb5\u91cc\u9762\u7684\u3002<code>.data<\/code> \u91cc\u9762\u53ef\u4ee5\u6709\u591a\u4e2a\u5168\u5c40\u53d8\u91cf\u7684\u5185\u5bb9\u3002\u6ce8\u610f\u770b <code>.data<\/code> \u6bb5\u7684 <code>sh_addr<\/code> \u8ddf <code>sh_offset<\/code> \u5b57\u6bb5\u3002<code>sh_addr<\/code> \u662f 0x201000\uff0c<code>sh_offset<\/code> \u662f 0x1000\uff0c<code>sh_offset<\/code> \u5f88\u660e\u663e\u5c31\u662f main \u6587\u4ef6\u7684\u504f\u79fb\u4f4d\u3002\u7b2c\u4e00\u4e2a\u5168\u5c40\u53d8\u91cf\u7684\u5185\u5bb9\u5c31\u5728 main \u6587\u4ef6\u7684 \u7b2c 0x1000 \u5b57\u8282\u3002\u6240\u4ee5 array \u7b26\u53f7\u7684\u4f4d\u7f6e \u5c31\u662f <code>st_value<\/code> \u51cf\u53bb <code>sh_addr<\/code> \uff0c\u5c31\u662farray \u7b26\u53f7\u76f8\u5bf9\u4e8e \u5165\u53e3\u7684\u504f\u79fb\u4f4d\uff0c\u4e5f\u5c31\u662f 0x10\uff0c\u6240\u4ee5 array \u7684\u5185\u5bb9\u5728 main \u6587\u4ef6\u7684 0x1010 \u7684\u4f4d\u7f6e\u3002\u5982\u4e0b\u56fe\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"972\" height=\"476\" src=\"https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/04\/byxt-2-4.png\" alt=\"\" class=\"wp-image-2221\" srcset=\"https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/04\/byxt-2-4.png 972w, https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/04\/byxt-2-4-300x147.png 300w, https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/04\/byxt-2-4-768x376.png 768w\" sizes=\"auto, (max-width: 972px) 100vw, 972px\" \/><\/figure>\n\n\n\n<p>\u4ece\u4e0a\u56fe\u53ef\u4ee5\u770b\u5230\uff0c <code class=\"prettyprint\" >array<\/code> \u6570\u7ec4\u7684 \u5143\u7d20\uff0c7\uff0c5\uff0c1 \u5168\u90fd\u5728\u8fd9\u91cc\u3002<\/p>\n\n\n\n<p>\u8fd9\u91cc\u8bb2\u4e2a\u6269\u5c55\u77e5\u8bc6\uff0c\u5982\u679c\u4e00\u4e2a \u7b26\u53f7\u4e0d\u662f\u6570\u7ec4\uff0c\u800c\u662f\u5355\u4e2a <code class=\"prettyprint\" >int<\/code> \uff0c\u90a3 <code>st_value<\/code> \u5c31\u662f\u4ed6\u5b9e\u9645\u7684\u503c\uff0c\u4e0d\u662f\u504f\u79fb\u4f4d\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-css-opacity\"\/>\n\n\n\n<p>\u73b0\u5728\u5df2\u7ecf\u627e\u5230 array \u7684\u4f4d\u7f6e\u4e86\uff0c\u73b0\u5728\u6765\u505a\u4e00\u4e2a\u5c0f\u5c0f\u7684\u9006\u5411\u64cd\u4f5c\uff0c\u5148\u6765\u6267\u884c\u4e00\u4e0b main \u6587\u4ef6\uff0c\u547d\u4ee4\u5982\u4e0b\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code class=\"prettyprint\" >.\/main\necho $?<\/code><\/pre>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"518\" height=\"147\" src=\"https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/04\/byxt-2-5.png\" alt=\"\" class=\"wp-image-2222\" srcset=\"https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/04\/byxt-2-5.png 518w, https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/04\/byxt-2-5-300x85.png 300w\" sizes=\"auto, (max-width: 518px) 100vw, 518px\" \/><\/figure>\n\n\n\n<p>\u53ef\u4ee5\u770b\u5230\uff0cmain \u8fd0\u884c\u4e4b\u540e\uff0c\u8fd4\u56de\u503c\u662f 13\uff0c\u73b0\u5728 \u7528 sublime \u4fee\u6539 main \u7684\u4e8c\u8fdb\u5236\u6587\u4ef6\uff0c\u4fee\u6539\u5982\u4e0b\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"640\" height=\"523\" src=\"https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/04\/byxt-2-6.png\" alt=\"\" class=\"wp-image-2226\" srcset=\"https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/04\/byxt-2-6.png 640w, https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/04\/byxt-2-6-300x245.png 300w\" sizes=\"auto, (max-width: 640px) 100vw, 640px\" \/><\/figure>\n\n\n\n<p>\u5982\u4e0a\u56fe\u6240\u793a\uff0c\u6211\u628a 5 \u6539\u6210\u4e86 8\uff0c\u5728\u8fd0\u884c\u4e00\u6b21\uff0c\u6548\u679c\u5982\u4e0b\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"731\" height=\"239\" src=\"https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/04\/byxt-2-7.png\" alt=\"\" class=\"wp-image-2227\" srcset=\"https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/04\/byxt-2-7.png 731w, https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/04\/byxt-2-7-300x98.png 300w\" sizes=\"auto, (max-width: 731px) 100vw, 731px\" \/><\/figure>\n\n\n\n<p>\u9006\u5411\u6210\u529f\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator 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