{"id":2189,"date":"2022-04-14T00:32:51","date_gmt":"2022-04-13T16:32:51","guid":{"rendered":"https:\/\/www.xianwaizhiyin.net\/?p=2189"},"modified":"2022-06-11T02:03:10","modified_gmt":"2022-06-10T18:03:10","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%e5%a4%b4%e9%83%a8","status":"publish","type":"post","link":"https:\/\/www.xianwaizhiyin.net\/?p=2189","title":{"rendered":"\u300a\u7f16\u8bd1\u7cfb\u7edf-\u81ea\u5e95\u5411\u4e0a\u7814\u7a76\u65b9\u6cd5\u300bELF\u5934\u90e8"},"content":{"rendered":"\n<p>\u63a5\u7740\u4e0a\u7bc7\u6587\u7ae0\u5206\u6790\uff0c<code class=\"prettyprint\" >main.c<\/code> \uff0c<code>sum.c<\/code>\uff0c<code>main<\/code> 3\u4e2a\u6587\u4ef6\uff0c\u4e0b\u8f7d\u5730\u5740\uff1a<a href=\"https:\/\/pan.baidu.com\/s\/1wBdCbZqWCQv0igSIuzqkpw\">\u767e\u5ea6\u7f51\u76d8<\/a>\uff0c\u63d0\u53d6\u7801\uff1acat1 \u3002\u7528 <code>xelfviewer<\/code> \u6253\u5f00 \u6587\u4ef6 main \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=\"668\" src=\"https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/04\/byxt-1-2-1-1024x668.png\" alt=\"\" class=\"wp-image-2192\" srcset=\"https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/04\/byxt-1-2-1-1024x668.png 1024w, https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/04\/byxt-1-2-1-300x196.png 300w, https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/04\/byxt-1-2-1-768x501.png 768w, https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/04\/byxt-1-2-1.png 1090w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p>\u4e0a\u56fe\u6211\u5708\u51fa\u6765\u51e0\u4e2a\u91cd\u70b9\uff0c\u4e0a\u9762\u7684 Offset \u662f\u6307\u8fd9\u4e2a\u5b57\u6bb5\u5728 main \u6587\u4ef6\u7684\u4f4d\u7f6e\uff0c\u4f8b\u5982 0x12 ~ 0x14 \u8fd9\u4e24\u4e2a\u5b57\u8282\u662f <code class=\"prettyprint\" >e_mechine<\/code> \u7684\u5185\u5bb9\u3002<\/p>\n\n\n\n<p>\u7136\u540e\u5f00\u5934\u7684 4\u4e2a \u5b57\u8282 7f 45 4c 46 \uff0c7f \u662f DEL\u63a7\u5236\u7b26\u7684ASII\u7801\uff0c\u540e\u97623 \u4e2a\u5b57\u8282\u662f ELF \u7684ASII\u7801\u3002\u8fd9\u56db\u4e2a\u5b57\u8282\u88ab\u53eb\u505a \u9b54\u6570\uff0c\u64cd\u4f5c\u7cfb\u7edf\u901a\u8fc7\u9b54\u6570\u51b3\u5b9a\u5982\u4f55\u52a0\u8f7d\u8fd0\u884c\u3002<\/p>\n\n\n\n<p>windows \u7684exe\u6587\u4ef6\uff0c\u524d\u9762\u4e24\u4e2a\u5b57\u8282\u662f 0x4d 0x5a \u3002<\/p>\n\n\n\n<p>google_ads_content<\/p>\n\n\n\n<p>ELF \u7684\u5934\u90e8\u4e00\u5171\u662f 64 \u4e2a\u5b57\u8282\uff0c\u6211\u6570\u4e86\u4e00\u4e0b\uff0c\u4e00\u5171\u6709 14 \u4e2a\u5b57\u6bb5\uff0c\u5176\u5b9e\u4e0a\u9762\u8fd9\u4e9b\u5b57\u6bb5\uff0c\u662f\u5728\u4e00\u4e2a\u7ed3\u6784\u4f53\u91cc\u9762\u5b9a\u4e49\u7684\uff0c\u5728 <code class=\"prettyprint\" >\/usr\/include\/elf.h<\/code> \u6587\u4ef6\u91cc\u9762\uff0c\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\/byxt-1-2-2.png\" alt=\"\"\/><\/figure>\n\n\n\n<p>\u5b9e\u9645\u4e0a\uff0c\u8fd9 14 \u4e2a\u5b57\u6bb5\uff0c\u53ea\u6709\u4e00\u4e9b\u662f\u91cd\u70b9\uff0c\u6211\u7740\u91cd\u8bb2\u4e00\u4e0b\u3002<\/p>\n\n\n\n<p>1\uff0ce_ident\uff0c16 \u4e2a\u5b57\u8282\uff0c \u9b54\u6570 \uff0c23\u4f4d\u8fd8\u662f64\uff0c\u5927\u7aef\u8fd8\u662f\u5c0f\u7aef\uff0cABI\u6807\u51c6\uff0c\u7b49\u4e00\u4e9b\u4fe1\u606f\u3002<\/p>\n\n\n\n<p>2\uff0ce_type\uff0c2\u4e2a\u5b57\u8282\uff0c\u4ee3\u8868\u6587\u4ef6\u7684\u7c7b\u578b\uff0c\u56e0\u4e3aELF\u683c\u5f0f\u4e0d\u662f\u53ea\u6709 <strong>\u53ef\u8fd0\u884c\u6587\u4ef6<\/strong>\u624d\u6709\uff0c<code class=\"prettyprint\" >.o<\/code> \u8fd9\u79cd\u6587\u4ef6\u4e5f\u662f ELF \u683c\u5f0f\u7684\u3002<\/p>\n\n\n\n<p>3\uff0c<strong>e_entry<\/strong>\uff0c8\u4e2a\u5b57\u8282\uff0c\u503c\u662f 4f0 \uff0c\u8fd9\u4e2a\u662f\u91cd\u70b9\uff0c\u672f\u8bed\u662f <strong>ELF \u7a0b\u5e8f\u7684\u5165\u53e3\u865a\u62df\u5730\u5740<\/strong>\uff0c\u8fd9\u6837\u8bf4\u6709\u70b9\u7ed5\u53e3\uff0c\u5b9e\u9645\u4e0a\uff0c\u53ef\u4ee5\u7406\u89e3\u4e3a\u7b2c\u4e00\u6761\u6267\u884c\u7684\u6307\u4ee4\u5c31\u662f\u4ece\u8fd9\u4e2a\u4f4d\u7f6e\u5f00\u59cb\u6267\u884c\u7684\u3002\u5982\u4e0b\u56fe\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"751\" src=\"https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/04\/byxt-1-2-3-1024x751.png\" alt=\"\" class=\"wp-image-2194\" srcset=\"https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/04\/byxt-1-2-3-1024x751.png 1024w, https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/04\/byxt-1-2-3-300x220.png 300w, https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/04\/byxt-1-2-3-768x563.png 768w, https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/04\/byxt-1-2-3.png 1092w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p>\u4e0a\u56fe\u8fd9\u4e9b\u90fd\u662f\u4e8c\u8fdb\u5236 \u673a\u5668\u7801\u6307\u4ee4\uff0c\u53ef\u4ee5\u4e22\u7ed9CPU\u8fd0\u884c\u7684\u3002\u4f46\u662f\u673a\u5668\u7801\u4e0d\u592a\u597d\u9605\u8bfb\uff0c\u6240\u4ee5\u9700\u8981\u53cd\u6c47\u7f16\u4e00\u4e0b\uff0c\u8fd9\u65f6\u5019\u5c31\u9700\u8981\u7528\u5230 <code class=\"prettyprint\" >objdump<\/code> \u8fd9\u4e2a\u5de5\u5177\u4e86\u3002\u547d\u4ee4\u5982\u4e0b\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code class=\"prettyprint\" >objdump -d main<\/code><\/pre>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"931\" height=\"418\" src=\"https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/04\/byxt-1-2-4.png\" alt=\"\" class=\"wp-image-2195\" srcset=\"https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/04\/byxt-1-2-4.png 931w, https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/04\/byxt-1-2-4-300x135.png 300w, https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/04\/byxt-1-2-4-768x345.png 768w\" sizes=\"auto, (max-width: 931px) 100vw, 931px\" \/><\/figure>\n\n\n\n<p>\u8fd9\u6837\u770b\uff0c\u5c31\u662f\u4e00\u4e9b \u6c47\u7f16\u6307\u4ee4\uff0c\u53ef\u4ee5\u770b\u5230 \u64cd\u4f5c\u7cfb\u7edf \u8fd0\u884c main \u6587\u4ef6\uff0c\u4e0d\u662f\u4ece <code class=\"prettyprint\" >main()<\/code> \u51fd\u6570\u5f00\u59cb\u7684\uff0c\u800c\u662f\u4ece\u4e00\u4e2a <code>_start()<\/code> \u51fd\u6570\u5f00\u59cb\uff0c\u53ef\u4ee5\u770b\u5230 <code>_start()<\/code> \u91cc\u9762\u8c03\u4e86\u4e00\u4e2a call \u6307\u4ee4\uff0c\u4e5f\u5c31\u662f \u4ece <code>_start()<\/code> \u91cc\u9762\u8c03 <code>main()<\/code>\u3002<\/p>\n\n\n\n<p><code class=\"prettyprint\" >_start()<\/code> \u505a\u7684\u4e8b\u60c5\u6bd4\u8f83\u7b80\u5355\uff0c\u5c31\u662f\u628a\u547d\u4ee4\u884c\u53c2\u6570 \u538b\u8fdb\u53bb\u6808\uff0c\u7ed9 <code>main()<\/code> \u51fd\u6570\u7528 \uff0cmain() \u51fd\u6570\u53ef\u4ee5\u63a5\u53d7 <code>argc<\/code> \uff0c<code>argv<\/code> \u53d8\u91cf\u7684\u3002<\/p>\n\n\n\n<p>\u8fd9\u91cc\u8fd8\u6709\u4e00\u4e2a\u9700\u8981\u7814\u7a76\u7684\u91cd\u70b9\u662f\uff0c<code class=\"prettyprint\" >callq<\/code> \u7684\u53c2\u6570 0x200ac6\uff0c\u5176\u5b9e\u8fd9\u662f\u4e00\u4e2a\u76f8\u5bf9\u5730\u5740\uff0c\u4e5f\u5c31\u662f\u8fd0\u884c\u5230 callq 0x200ac6 \u6307\u4ee4\u7684\u65f6\u5019\uff0c\u8981\u505a\u4e24\u4ef6\u4e8b\u60c5\u3002<\/p>\n\n\n\n<p>1\uff0ccallq \u4f1a\u628a \u4e0b\u6761\u6307\u4ee4\u7684\u5730\u5740\u503c\u538b\u5230\u6808\u9876\u4e0a\uff0c\u65b9\u4fbf \u91cc\u9762\u7528 ret \u8df3\u56de\u6765\u3002<\/p>\n\n\n\n<p>2\uff0c\u7b2c\u4e8c\u4e2a\u662f\u91cd\u70b9\uff0c<code class=\"prettyprint\" >callq<\/code> \u5b9e\u9645\u4e0a\u662f\u4e00\u4e2a <code>jmp<\/code> \uff0c\u4f1a\u8fdb\u884c\u8df3\u8f6c\uff0c\u8df3\u8f6c\u5730\u5740\u662f \u5bc4\u5b58\u5668 rip \u7684\u503c \u52a0\u4e0a 0x200ac6\uff0c\u8fd9\u4e2a\u8df3\u8f6c\u5730\u5740\u5b9e\u9645\u4e0a\u4f1a\u8df3\u8f6c\u5230 <code>main()<\/code> \u51fd\u6570\u7684\u4ee3\u7801\u3002<code>main()<\/code> \u51fd\u6570\u4ee3\u7801\u7684\u4f4d\u7f6e\u5982\u4e0b\u56fe\uff0c\u8fd8\u662f\u7528 <code>objdump<\/code> \u6253\u5370\u51fa\u6765\u7684\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"766\" height=\"220\" src=\"https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/04\/byxt-1-2-5.png\" alt=\"\" class=\"wp-image-2191\" srcset=\"https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/04\/byxt-1-2-5.png 766w, https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/04\/byxt-1-2-5-300x86.png 300w\" sizes=\"auto, (max-width: 766px) 100vw, 766px\" \/><\/figure>\n\n\n\n<p>\u6ce8\u610f\u770b\u5de6\u8fb9\u7684 <code class=\"prettyprint\" >5fa<\/code>\uff0c\u8fd9\u662f\u6587\u4ef6\u7684\u504f\u79fb\u4f4d\u7f6e\u3002\u5728\u7528 notepad++ \u67e5\u770b\u4e8c\u8fdb\u5236\u5185\u5bb9\uff0c\u5982\u4e0b\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"984\" height=\"382\" src=\"https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/04\/byxt-1-2-6.png\" alt=\"\" class=\"wp-image-2198\" srcset=\"https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/04\/byxt-1-2-6.png 984w, https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/04\/byxt-1-2-6-300x116.png 300w, https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/04\/byxt-1-2-6-768x298.png 768w\" sizes=\"auto, (max-width: 984px) 100vw, 984px\" \/><\/figure>\n\n\n\n<p>\u6240\u4ee5 main \u51fd\u6570\u7684\u4ee3\u7801\uff0c\u786e\u5b9e\u662f\u5728 5fa \u7684\u4f4d\u7f6e\uff0c\u4f46\u662f\u8fd0\u884c\u7684\u65f6\u5019\uff0ccallq \u7684\u53c2\u6570\u662f rip \u52a0\u4e0a 0x200ac6\uff0crip \u662f\u8fd0\u884c\u7684\u65f6\u5019\u624d\u77e5\u9053\uff0c\u7f16\u8bd1\u7cfb\u7edf\u662f\u600e\u4e48\u8fd9\u4e48\u806a\u660e\u80fd\u6b63\u597d<\/p>\n\n\n\n<p>rip \u52a0\u4e0a 0x200ac6 \u5c31\u80fd\u8df3\u5230 5fa \u7684\u4f4d\u7f6e\u7684\u5462\uff1f\u8fd9\u4e2a <code class=\"prettyprint\" >0x200ac6<\/code> \u662f\u600e\u4e48\u8ba1\u7b97\u51fa\u6765\u7684\uff1f\u8fd9\u4e2a\u95ee\u9898\u53ef\u4ee5\u8bf4\u662f\u672c\u6587\u7684\u91cd\u70b9\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-css-opacity\"\/>\n\n\n\n<p>\u7528 <code class=\"prettyprint\" >gdb<\/code> \u8c03\u8bd5\uff0c\u5728 _start \u51fd\u6570\u7684\u5165\u53e3\u6253\u4e2a\u65ad\u70b9\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code class=\"prettyprint\" >b *_start<\/code><\/pre>\n\n\n\n<p>\u65ad\u70b9\u8c03\u8bd5\u4e4b\u540e\u53d1\u73b0\uff0c<strong>callq 0x200ac6 \u5e76\u4e0d\u662f\u8df3\u8f6c \u5230 main() \u51fd\u6570<\/strong>\uff0c\u800c\u662f\u8fd8\u6709\u4e00\u5c42 <code class=\"prettyprint\" >__libc_start_main<\/code>\uff0c\u5982\u4e0b\u56fe<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"574\" src=\"https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/04\/byxt-1-2-7-1024x574.png\" alt=\"\" class=\"wp-image-2196\" srcset=\"https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/04\/byxt-1-2-7-1024x574.png 1024w, https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/04\/byxt-1-2-7-300x168.png 300w, https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/04\/byxt-1-2-7-768x431.png 768w, https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/04\/byxt-1-2-7.png 1182w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p><code class=\"prettyprint\" >__libc_start_main<\/code> \u8fd9\u4e2a\u51fd\u6570\u5e94\u8be5\u662f <code>libc<\/code> \u52a8\u6001\u5e93\u7684\u4e00\u4e2a\u51fd\u6570\u3002\u4f30\u8ba1\u662f\u521d\u59cb\u5316\u73af\u5883\u53d8\u91cf\u4ec0\u4e48\u7684\uff0c\u6240\u4ee5\u8fd9\u4e2a <code>0x200ac6<\/code> \u6682\u65f6\u4e0d\u7ba1\u4ed6\u3002\u9694\u4e86\u592a\u591a\u5c42\uff0c\u4e0d\u597d\u5206\u6790\u3002<\/p>\n\n\n\n<p>\u4e0d\u8fc7 callq \u7684\u53c2\u6570\uff0c\u8fd8\u662f\u975e\u5e38\u503c\u5f97\u7814\u7a76\u7684\uff0c\u6211\u4eec main.c \u91cc\u9762\u8c03\u7528 sum.c \u7684\u51fd\u6570 sum\uff0c\u8fd9\u4e5f\u662f\u4e00\u4e2a callq \uff0c\u54b1\u4eec\u6765\u5206\u6790\u8fd9\u4e2a\uff0c\u5982\u4e0b\u56fe\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"705\" height=\"424\" src=\"https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/04\/byxt-1-2-8.png\" alt=\"\" class=\"wp-image-2197\" srcset=\"https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/04\/byxt-1-2-8.png 705w, https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/04\/byxt-1-2-8-300x180.png 300w\" sizes=\"auto, (max-width: 705px) 100vw, 705px\" \/><\/figure>\n\n\n\n<p>\u53ef\u4ee5\u770b\u5230\uff0c\u8fd9\u91cc\u7684 callq \u7684\u53c2\u6570\u662f 0x8\uff0c\u8fd9\u4e2a 8 \u662f\u600e\u4e48\u8ba1\u7b97\u51fa\u6765\u7684\u5462\uff1f\u5b9e\u9645\u4e0a\u5c31\u662f 61b \u51cf\u53bb 60e \u5f97\u5230\u7684\u3002\u4e5f\u5c31\u662f\u8bf4\uff0c\u65e0\u8bba\u64cd\u4f5c\u7cfb\u7edf\u8fd0\u884c\u65f6 \u628a\u8fd9\u4e2a 60e \u7684\u4f4d\u7f6e\u6620\u5c04\u5230\u5185\u5b58\u7684\u54ea\u4e2a\u4f4d\u7f6e\uff0c\u6307\u4ee4\u6267\u884c\u5230 call 08 00 00 00 \u7684\u65f6\u5019\uff0c\u5bc4\u5b58\u5668 rip \u7684\u503c\u5c31\u53ef\u4ee5\u770b\u505a\u662f 60e \uff0c\u6307\u4ee4\u6620\u5c04\u5230\u5185\u5b58\u4e5f\u662f\u8fde\u7eed\u7684\uff0c\u6240\u4ee5\u504f\u79fb 8 \u4e2a\u5b57\u8282\uff0c\u81ea\u7136\u5c31\u4f1a\u8df3\u5230 sum \u51fd\u6570\u7684\u5f00\u59cb\u4f4d\u7f6e 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