{"id":2203,"date":"2022-04-14T17:08:34","date_gmt":"2022-04-14T09:08:34","guid":{"rendered":"https:\/\/www.xianwaizhiyin.net\/?p=2203"},"modified":"2022-06-11T02:02:48","modified_gmt":"2022-06-10T18:02:48","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%e6%ae%b5%e8%a1%a8","status":"publish","type":"post","link":"https:\/\/www.xianwaizhiyin.net\/?p=2203","title":{"rendered":"\u300a\u7f16\u8bd1\u7cfb\u7edf-\u81ea\u5e95\u5411\u4e0a\u7814\u7a76\u65b9\u6cd5\u300bELF\u6bb5\u8868"},"content":{"rendered":"\n<p><a href=\"https:\/\/www.xianwaizhiyin.net\/?p=2189\">\u300a\u7f16\u8bd1\u7cfb\u7edf-\u81ea\u5e95\u5411\u4e0a\u7814\u7a76\u65b9\u6cd5\u300bELF\u5934\u90e8<\/a> \uff0c\u4e4b\u524d\u8fd9\u7bc7\u6587\u7ae0\u8bb2\u89e3\u4e86 ELF \u7684\u5934\u90e8\uff0c\u5934\u90e8\u6709\u51e0\u4e2a\u6bb5\u8868\u7684\u5b57\u6bb5\uff0c\u5f53\u65f6\u6ca1\u6709\u4ed4\u7ec6\u8bb2\u89e3\u3002<\/p>\n\n\n\n<p>1\uff0c<code class=\"prettyprint\" >e_shoff<\/code> \uff0c\u6bb5\u8868\u7684\u6307\u9488\uff0c\u4e5f\u5c31\u662f\u6bb5\u8868\u5728 <code>main<\/code> \u6587\u4ef6\u7684\u504f\u79fb\u503c\u3002<\/p>\n\n\n\n<p>2\uff0c<code class=\"prettyprint\" >e_shensize<\/code>\uff0c\u6bb5\u8868\u4e2d\u5355\u4e2a\u6bb5\u7684\u5927\u5c0f\u3002<\/p>\n\n\n\n<p>3\uff0c<code class=\"prettyprint\" >e_shnum<\/code>\uff0c\u6bb5\u8868\u4e2d \u6bb5\u7684\u6570\u91cf\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>\u518d\u6b21\u7528 <code class=\"prettyprint\" >xelfviewer<\/code> \u6253\u5f00 main \u6587\u4ef6\uff0c\u5982\u4e0b\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"909\" height=\"513\" src=\"https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/04\/byxt-1-3-1.png\" alt=\"\" class=\"wp-image-2208\" srcset=\"https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/04\/byxt-1-3-1.png 909w, https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/04\/byxt-1-3-1-300x169.png 300w, https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/04\/byxt-1-3-1-768x433.png 768w\" sizes=\"auto, (max-width: 909px) 100vw, 909px\" \/><\/figure>\n\n\n\n<p>\u6ce8\u610f\u770b\u4e0a\u56fe\u7528 \u7ea2\u7b14 \u5708\u51fa\u6765\u7684\u5b57\u6bb5\uff0c\u8fd9\u4e9b\u90fd\u662f 16 \u8fdb\u5236\u7684\u3002\u53ef\u4ee5\u770b\u5230 <code class=\"prettyprint\" >e_shoff<\/code> \u7684\u503c\u662f 0x1948 \uff0c\u4e5f\u5c31\u662f 6472 \uff0c\u6240\u4ee5 main \u6587\u4ef6 \u4ece\u7b2c6472 \u5b57\u8282\u5f00\u59cb\u5c31\u662f \u6bb5\u8868\u7684\u5185\u5bb9\uff0c\u56e0\u4e3a\u4e00\u4e2a\u6bb5\u5927\u5c0f\u662f 0x40 \u5b57\u8282\uff0c\u6240\u4ee5 \u7b2c 6472 ~ 6536 \u5b57\u8282\u662f\u7b2c\u4e00\u4e2a\u6bb5\u7684\u5185\u5bb9\uff0c\u7b2c 6537 ~ 6660 \u5b57\u8282\u662f\u7b2c\u4e8c\u4e2a\u6bb5\u7684\u5185\u5bb9\uff0c\u4ee5\u6b64\u7c7b\u63a8\u3002\u4e00\u5171\u6709 <code>e_shnum<\/code> \uff0828\uff09\u4e2a\u6bb5\u3002<\/p>\n\n\n\n<p>\u6bb5\u5176\u5b9e\u662f\u4e00\u4e2a <code class=\"prettyprint\" >Elf64_Shdr<\/code> \u7ed3\u6784\u4f53\u5b9a\u4e49\u7684\uff0c\u5728\u5728 <code>\/usr\/include\/elf.h<\/code> \u6587\u4ef6\u91cc\u9762\uff0c\u5982\u4e0b\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code class=\"prettyprint\" >typedef struct\n{\n  Elf64_Word    sh_name;        \/* Section name (string tbl index) *\/\n  Elf64_Word    sh_type;        \/* Section type *\/\n  Elf64_Xword   sh_flags;       \/* Section flags *\/\n  Elf64_Addr    sh_addr;        \/* Section virtual addr at execution *\/\n  Elf64_Off sh_offset;      \/* Section file offset *\/\n  Elf64_Xword   sh_size;        \/* Section size in bytes *\/\n  Elf64_Word    sh_link;        \/* Link to another section *\/\n  Elf64_Word    sh_info;        \/* Additional section information *\/\n  Elf64_Xword   sh_addralign;       \/* Section alignment *\/\n  Elf64_Xword   sh_entsize;     \/* Entry size if section holds table *\/\n} Elf64_Shdr;<\/code><\/pre>\n\n\n\n<p><code class=\"prettyprint\" >Elf64_Shdr<\/code> \u8fd9\u4e2a\u7ed3\u6784\u4f53\u5c31\u662f 0x40 \u5b57\u8282\u5927\u5c0f\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-css-opacity\"\/>\n\n\n\n<p>\u4e0b\u9762\u5c31 \u4ece \u7b2c 6472 \u5b57\u8282\u5f00\u59cb\u5206\u6790 \u6bb5\u8868\u7684\u5404\u4e2a\u6bb5\u7684\u5185\u5bb9\u3002\u8fd8\u662f\u7528 <code class=\"prettyprint\" >xelfviewer<\/code>\uff0c\u7248\u672c\u662f0.04\uff0c\u76f4\u63a5\u70b9\u51fb\u5de6\u8fb9\u7684 <code>Sections<\/code> \u9009\u9879\u5373\u53ef\uff0cSections \u5c31\u662f \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=\"346\" src=\"https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/04\/byxt-1-3-2-1024x346.png\" alt=\"\" class=\"wp-image-2209\" srcset=\"https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/04\/byxt-1-3-2-1024x346.png 1024w, https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/04\/byxt-1-3-2-300x101.png 300w, https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/04\/byxt-1-3-2-768x260.png 768w, https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/04\/byxt-1-3-2-1536x520.png 1536w, https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/04\/byxt-1-3-2.png 1697w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p>\u4ece\u4e0a\u56fe\u53ef\u4ee5\u770b\u5230\uff0c\u4e2d\u95f4\u8fd9\u4e2a\u8868\u683c\u7684\u5217\u5c31\u662f\u6309\u7167 <code class=\"prettyprint\" >Elf64_Shdr<\/code> \u7ed3\u6784\u4f53\u89e3\u6790\u51fa\u6765\u7684\u3002\u4e0d\u8fc7\u8981\u6ce8\u610f\u4e00\u4e0b \u5e95\u90e8\u7684 \u5341\u516d\u8fdb\u5236 \uff0c\u6211\u7528\u7ea2\u7b14\u5708\u51fa\u6765\u7684\uff0c\u8fd9\u4e2a\u4e0d\u662f <code>Elf64_Shdr<\/code> \u7ed3\u6784\u4f53 \u5bf9\u5e94\u7684\u5341\u516d\u8fdb\u5236\u3002\u800c\u662f \u6bb5 \u5bf9\u5e94\u7684 value\uff0c\u53ef\u4ee5\u770b\u5230\u7b2c\u4e8c\u4e2a\u6bb5\u7684 <code>sh_addr<\/code> \u662f 0x238 \uff0c\u4f4e\u4e0b \u7684\u4e5f\u662f\u4ece 0x238 \u4f4d\u7f6e\u5f00\u59cb\u7684\u5185\u5bb9\u3002\u8fd9\u4e2a\u7b49\u4e0b\u4f1a\u8be6\u7ec6\u8bb2\u89e3\u3002<\/p>\n\n\n\n<p>\u73b0\u5728\u5148\u6765\u9a8c\u8bc1\u4e00\u4e2a\u95ee\u9898\uff0c\u4e4b\u524d\u8bf4 \u6bb5\u8868\u662f \u4ece main\u6587\u4ef6\u7684 \u7b2c 0x1948 \u5b57\u8282 \u5f00\u59cb\u89e3\u6790\u7684\uff0c\u7528 notepad++ \u6765\u770b\u770b\u662f\u4e0d\u662f\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=\"550\" src=\"https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/04\/byxt-1-3-3-1024x550.png\" alt=\"\" class=\"wp-image-2210\" srcset=\"https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/04\/byxt-1-3-3-1024x550.png 1024w, https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/04\/byxt-1-3-3-300x161.png 300w, https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/04\/byxt-1-3-3-768x413.png 768w, https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/04\/byxt-1-3-3-1536x826.png 1536w, https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/04\/byxt-1-3-3.png 1667w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p>\u4ece\u4e0a\u56fe\u53ef\u4ee5\u770b\u5230\uff0c<code class=\"prettyprint\" >xelfviewer<\/code> \u8ddf <code>notepad++<\/code> \u4e24\u4e2a\u8f6f\u4ef6\u7684\u6570\u636e\u90fd\u80fd\u5bf9\u5f97\u4e0a\uff0c\u8bc1\u660e\u4e4b\u524d\u7684\u8bf4\u6cd5\u6ca1\u6709\u95ee\u9898\u3002\u6bb5\u8868\u786e\u5b9e\u662f \u4ece0x1948 \u5f00\u59cb\u89e3\u6790\u7684\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-css-opacity\"\/>\n\n\n\n<p>\u6bb5\u8868\u7684\u7b2c\u4e00\u4e2a\u6bb5\uff0c\u901a\u5e38\u662f\u7a7a\uff0c\u4e5f\u5c31\u662f\u5168\u90fd\u662f 0 \uff0c\u4e0d\u7528\u7ba1\u4ed6\u3002\u4ece\u7b2c\u4e8c\u4e2a\u6bb5\u5f00\u59cb\u5206\u6790\uff0c\u7b2c\u4e8c\u4e2a\u6bb5\u7684 <code class=\"prettyprint\" >sh_name<\/code> \u5b57\u6bb5\u662f <code>1b<\/code>\uff0c\u8fd9\u4e2a <code>1b<\/code> \u662f\u4ec0\u4e48\u4e1c\u897f\u5462\uff1f\u5b9e\u9645\u4e0a\uff0c\u8fd9\u4e5f\u662f\u4e00\u4e2a\u504f\u79fb\u503c\uff0c\u901a\u8fc7\u504f\u79fb\u627e\u5230\u771f\u6b63\u7684\u5b57\u7b26\u4e32\uff0c\u800c\u4e0d\u662f\u628a\u5b57\u7b26\u4e32\u76f4\u63a5\u5b58\u5728 <code>sh_name<\/code> \u5b57\u6bb5\u3002<\/p>\n\n\n\n<p>\u90a3\u8fd9\u4e2a 1b \u662f\u54ea\u4e2a\u5730\u65b9\u7684\u504f\u79fb\u5462\uff1f\u5728 ELF \u5934\u90e8\uff0c\u4e4b\u524d\u6709\u4e2a\u5b57\u6bb5\u6ca1\u6709\u8bb2\uff0c\u5c31\u662f <code class=\"prettyprint\" >e_shstrndx<\/code> \u5b57\u6bb5\uff0c\u5168\u79f0 <code>Section header string table index<\/code>\uff0c\u7ffb\u8bd1\u662f \u6bb5\u5b57\u7b26\u4e32\u8868\u7684\u7d22\u5f15\u503c\uff0c\u4ed6\u7684\u503c\u662f 0x1b \uff0c\u4e5f\u5c31\u662f 27 \uff0c\u8fd9\u662f\u4e00\u4e2a\u4e0b\u6807\u503c\u3002\u4e4b\u524d\u8bf4\u8fc7 \u6bb5\u8868\u91cc\u9762\u6709 28\u4e2a\u6bb5\uff0c\u6240\u4ee5 \u5b57\u7b26\u4e32\u8868 \u5c31\u662f \u6700\u540e\u4e00\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=\"365\" src=\"https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/04\/byxt-1-3-4-1024x365.png\" alt=\"\" class=\"wp-image-2205\" srcset=\"https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/04\/byxt-1-3-4-1024x365.png 1024w, https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/04\/byxt-1-3-4-300x107.png 300w, https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/04\/byxt-1-3-4-768x274.png 768w, https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/04\/byxt-1-3-4-1536x547.png 1536w, https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/04\/byxt-1-3-4.png 1676w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p>\u6ce8\u610f\u770b\u4e0a\u56fe\u7684\u6bb5\uff0c\u4ed6\u7684 <code class=\"prettyprint\" >sh_offset<\/code> \u662f 0x1848 \uff0c\u8fd9\u4e2a\u6bb5\u7684 value \u662f \u4ece main \u6587\u4ef6\u7684 \u7b2c 0x1848 \u5b57\u8282\u5f00\u59cb\u7684\u3002\u6240\u4ee5 \u7b2c\u4e8c\u4e2a\u6bb5\u7684 <code>sh_name<\/code> \u5c31\u662f 0x1848 + 0x1b \u7b49\u4e8e 0x1863 \u7684\u4f4d\u7f6e\uff0c\u76f4\u63a5\u7528 notepad++ \u67e5\u770b\u8fd9\u4e2a\u4f4d\u7f6e\u7684\u6570\u636e\uff0c\u5982\u4e0b\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"997\" height=\"379\" src=\"https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/04\/byxt-1-3-5.png\" alt=\"\" class=\"wp-image-2206\" srcset=\"https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/04\/byxt-1-3-5.png 997w, https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/04\/byxt-1-3-5-300x114.png 300w, https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/04\/byxt-1-3-5-768x292.png 768w\" sizes=\"auto, (max-width: 997px) 100vw, 997px\" \/><\/figure>\n\n\n\n<p>\u53ef\u4ee5\u770b\u5230\uff0c\u8fd9\u4e2a\u4f4d\u7f6e\uff0c\u5c31\u662f <code class=\"prettyprint\" >interp<\/code> \u5b57\u7b26\u4e32\u3002\u5b57\u7b26\u4e32\u4ee5 00 \u7ed3\u5c3e\u7684\u3002<code>xelfviewer<\/code> \u4e3a\u4e86\u65b9\u4fbf\u67e5\u770b\uff0c\u5012\u6570\u7b2c\u4e8c\u5217\u7684 <code>Name<\/code> \u5c31\u662f\u8fd9\u6837\u89e3\u6790\u663e\u793a\u51fa\u6765\u7684\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-css-opacity\"\/>\n\n\n\n<p>\u8bb2\u89e3\u5230\u8fd9\u91cc\uff0c\u662f\u65f6\u5019\u753b\u4e00\u5f20\u6570\u636e\u7ed3\u6784\u4f53\uff0c\u9996\u5148\u662f \u5934\u90e8<code class=\"prettyprint\" 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