{"rsdb":{"rid":"301784","subhead":"","postdate":"0","aid":"217029","fid":"54","uid":"1","topic":"1","content":"

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\u4f46\u662f\u5728\u52a8\u6001\u94fe\u63a5\u60c5\u51b5\u4e0b,\u64cd\u4f5c\u7cfb\u7edf\u8fd8\u4e0d\u80fd\u5728\u88c5\u8f7d\u5b8c\u53ef\u6267\u884c\u6587\u4ef6\u4e4b\u540e\u5c31\u628a\u63a7\u5236\u6743\u4ea4\u7ed9\u53ef\u6267\u884c\u6587\u4ef6,\u56e0\u4e3a\u6211\u4eec\u77e5\u9053\u53ef\u6267\u884c\u6587\u4ef6\u4f9d\u8d56\u4e8e\u5f88\u591a\u5171\u4eab\u5bf9\u8c61\u3002\u8fd9\u65f6\u5019,\u53ef\u6267\u884c\u6587\u4ef6\u91cc\u5bf9\u4e8e\u5f88\u591a\u5916\u90e8\u7b26\u53f7\u7684\u5f15\u7528\u8fd8\u5904\u4e8e\u65e0\u6548\u5730\u5740\u7684\u72b6\u6001,\u5373\u8fd8\u6ca1\u6709\u8ddf\u76f8\u5e94\u7684\u5171\u4eab\u5bf9\u8c61\u4e2d\u7684\u5b9e\u9645\u4f4d\u7f6e\u94fe\u63a5\u8d77\u6765\u3002\u6240\u4ee5\u5728\u6620\u5c04\u5b8c\u53ef\u6267\u884c\u6587\u4ef6\u4e4b\u540e,\u64cd\u4f5c\u7cfb\u7edf\u4f1a\u5148\u542f\u52a8\u4e2a\u52a8\u6001\u94fe\u63a5\u5668( Dynamic Linker)<\/strong><\/p>

\u5728 Linux\u4e0b,\u52a8\u6001\u94fe\u63a5\u5668ld.so\u5b9e\u9645\u4e0a\u662f\u4e00\u4e2a\u5171\u4eab\u5bf9\u8c61,\u64cd\u4f5c\u7cfb\u7edf\u540c\u6837\u901a\u8fc7\u6620\u5c04\u7684\u65b9\u5f0f\u5c06\u5b83\u52a0\u8f7d\u5230\u8fdb\u7a0b\u7684\u5730\u5740\u7a7a\u95f4\u4e2d\u3002\u64cd\u4f5c\u7cfb\u7edf\u5728\u52a0\u8f7d\u5b8c\u52a8\u6001\u94fe\u63a5\u5668\u4e4b\u540e,\u5c31\u5c06\u63a7\u5236\u6743\u4ea4\u7ed9\u52a8\u6001\u94fe\u63a5\u5668\u7684\u5165\u53e3\u5730\u5740(\u4e0e\u53ef\u6267\u884c\u6587\u4ef6\u4e00\u6837,\u5171\u4eab\u5bf9\u8c61\u4e5f\u6709\u5165\u53e3\u5730\u5740)\u3002\u5f53\u52a8\u6001\u94fe\u63a5\u5668\u5f97\u5230\u63a7\u5236\u6743\u4e4b\u540e,\u5b83\u5f00\u59cb\u6267\u884c\u4e00\u7cfb\u5217\u81ea\u8eab\u7684\u521d\u59cb\u5316\u64cd\u4f5c,\u7136\u540e\u6839\u636e\u5f53\u524d\u7684\u73af\u5883\u53c2\u6570,\u5f00\u59cb\u5bf9\u53ef\u6267\u884c\u6587\u4ef6\u8fdb\u884c\u52a8\u6001\u94fe\u63a5\u5de5\u4f5c\u3002\u5f53\u6240\u6709\u52a8\u6001\u94fe\u63a5\u5de5\u4f5c\u5b8c\u6210\u4ee5\u540e,\u52a8\u6001\u94fe\u63a5\u5668\u4f1a\u5c06\u63a7\u5236\u6743\u8f6c\u4ea4\u5230\u53ef\u6267\u884c\u6587\u4ef6\u7684\u5165\u53e3\u5730\u5740,\u7a0b\u5e8f\u5f00\u59cb\u6b63\u5f0f\u6267\u884c\u3002<\/p>

\u90a3\u4e48\u7cfb\u7edf\u4e2d\u54ea\u4e2a\u624d\u662f\u52a8\u6001\u94fe\u63a5\u5668\u5462,\u5b83\u7684\u4f4d\u7f6e\u7531\u8c01\u51b3\u5b9a?\u662f\u4e0d\u662f\u6240\u6709\u7684*NX\u7cfb\u7edf\u7684\u52a8\u6001\u94fe\u63a5\u5668\u90fd\u4f4d\u4e8e \/lib\/ld.so\u5462?\u5b9e\u9645\u4e0a,\u52a8\u6001\u94fe\u63a5\u5668\u7684\u4f4d\u7f6e\u65e2\u4e0d\u662f\u7531\u7cfb\u7edf\u914d\u7f6e\u6307\u5b9a,\u4e5f\u4e0d\u662f\u7531\u73af\u5883\u53c2\u6570\u51b3\u5b9a,\u800c\u662f\u7531ELF\u53ef\u6267\u884c\u6587\u4ef6\u51b3\u5b9a\u3002\u5728\u52a8\u6001\u94fe\u63a5\u7684ELF\u53ef\u6267\u884c\u6587\u4ef6\u4e2d,\u6709\u4e00\u4e2a\u4e13\u95e8\u7684\u6bb5\u53eb\u505a\u201c Interp\u201d\u6bb5(\u201c Interp\u201d\u662f\u201c Interpreter\u201d(\u89e3\u91ca\u5668)\u7684\u7f29\u5199)\u3002\u5982\u679c\u6211\u4eec\u4f7f\u7528 objdump\u5de5\u5177\u6765\u67e5\u770b,\u53ef\u4ee5\u770b\u5230\u201c .interp\u201d\u5185\u5bb9:<\/p>

\"\"<\/p>

".interp"\u7684\u5185\u5bb9\u5f88\u7b80\u5355\uff0c\u91cc\u9762\u4fdd\u5b58\u7684\u5c31\u662f\u4e00\u4e2a\u5b57\u7b26\u4e32\uff0c\u8fd9\u4e2a\u5b57\u7b26\u4e32\u5c31\u662f\u53ef\u6267\u884c\u7684\u6240\u9700\u8981\u7684\u52a8\u6001\u94fe\u63a5\u5668\u7684\u8def\u5f84\u3002\u5728LINUX\u4e0b\uff0c\u53ef\u6267\u884c\u6587\u4ef6\u6240\u9700\u8981\u7684\u52a8\u6001\u94fe\u63a5\u5668\u7684\u8def\u5f84\u51e0\u4e4e\u90fd\u662f \u201c\/lib\/ld-linux.so.2\u201d\uff0c\u5176\u4ed6\u7684*.nix\u64cd\u4f5c\u7cfb\u7edf\u53ef\u80fd\u4f1a\u6709\u4e0d\u540c\u8def\u5f84\u3002\u6211\u4eec\u5728\u540e\u9762\u8fd8\u4f1a\u4ecb\u7ecd\u5230\u5404\u79cd\u73af\u5883\u4e0b\u7684\u52a8\u6001\u94fe\u63a5\u5668\u7684\u8def\u5f84\u3002\u5728LINUX\u7cfb\u7edf\u4e2d\uff0c\/lib\/ld-linux.so.2\u901a\u5e38\u662f\u4e00\u4e2a\u8f6f\u94fe\u63a5\uff0c\u6bd4\u5982\u5728\u6211\u7684\u673a\u5668\u4e2d\uff0c\u5b83\u6307\u5411\/lib\/ld-linux.so.2\uff0c\u8fd9\u4e2a\u624d\u662f\u771f\u6b63\u7684\u52a8\u6001\u94fe\u63a5\u5668\uff0c\u5728linux\u4e2d\uff0c\u64cd\u4f5c\u7cfb\u7edf\u5728\u5bf9\u53ef\u6267\u884c\u6587\u4ef6\u6240\u9700\u8981\u7684\u76f8\u5e94\u52a8\u6001\u8fde\u63a5\u5668\uff0c\u5373\u201c.interp\u201d\u6bb5\u6307\u5b9a\u7684\u8def\u5f84\u7684\u5171\u4eab\u5bf9\u8c61\uff1b<\/p>

\u52a8\u6001\u94fe\u63a5\u5668\u5728linux\u4e0b\u662fglibc\u7684\u4e00\u90e8\u5206\uff0c\u4e5f\u5c31\u662f\u5c5e\u4e8e\u7cfb\u7edf\u5e93\u7ea7\u522b\u7684\uff0c\u5b83\u7684\u7248\u672c\u53f7\u5f80\u5f80\u8ddf\u7cfb\u7edf\u7684Glibc\u5e93\u7248\u672c\u53f7\u662f\u4e00\u6837\u7684\uff0c\u6bd4\u5982\u6211\u7684\u7cfb\u7edf\u4e2d\u5b89\u88c5\u7684\u662fglibc 2.6.1\uff0c\u90a3\u4e48\u76f8\u5e94\u7684\u52a8\u6001\u94fe\u63a5\u5e93\u5c31\u662f\/lib\/ld-2.6.1.so\u3002\u5f53\u7cfb\u7edf\u4e2d\u7684Glibc\u5e93\u66f4\u65b0\u6216\u8005\u5b89\u88c5\u5176\u4ed6\u7248\u672c\u7684\u65f6\u5019\uff0c\/lib\/ld-linux.so.2 \u8fd9\u4e2a\u8f6f\u94fe\u63a5\u5c31\u4f1a\u6307\u5411\u65b0\u7684\u52a8\u6001\u94fe\u63a5\u5668\uff0c\u800c\u53ef\u6267\u884c\u6587\u4ef6\u672c\u8eab\u4e0d\u9700\u8981\u4fee\u6539 ".interp" \u4e2d\u7684\u52a8\u6001\u94fe\u63a5\u5668\u8def\u5f84\u6765\u9002\u5e94\u7cfb\u7edf\u7684\u5347\u7ea7<\/p>

\u6211\u4eec\u5f80\u5f80\u53ef\u4ee5\u7528\u8fd9\u4e2a\u547d\u4ee4\u6765\u67e5\u770b\u4e00\u4e2a\u53ef\u6267\u884c\u6587\u4ef6\u6240\u9700\u8981\u7684\u52a8\u6001\u94fe\u63a5\u5668\u7684\u8def\u5f84\uff0c\u5728linux\u4e0b\uff0c\u5f80\u5f80\u662f\u8fd9\u4e2a\u7ed3\u679c\uff1a<\/p>

\u800c\u5f53\u6211\u4eec\u5728FreeBSD 4.6.2 \u4e0b\u6267\u884c\u8fd9\u4e2a\u547d\u4ee4\u65f6\uff0c\u7ed3\u679c\u662f\uff1a<\/p>

64 \u4f4d\u7684linux\u4e0b\u7684\u53ef\u6267\u884c\u6587\u4ef6\u662f\uff1a<\/p>

\u7c7b\u4f3c\u4e8e\u201c.interp\u201d\u8fd9\u6837\u7684\u6bb5\uff0cELF\u4e2d\u8fd8\u6709\u51e0\u4e2a\u6bb5\u4e5f\u662f\u4e13\u95e8\u7528\u4e8e\u52a8\u6001\u94fe\u63a5\u7684\uff0c\u6bd4\u5982 ".dynamic" \u6bb5\u548c ".dynsym"\u6bb5\u7b49\u3002\u8981\u4e86\u89e3\u52a8\u6001\u94fe\u63a5\u5668\u5982\u4f55\u5b8c\u6210\u94fe\u63a5\u8fc7\u7a0b\uff0c\u8ddf\u524d\u9762\u4e00\u6837\uff0c\u4ece\u4e86\u89e3ELF\u6587\u4ef6\u4e2d\u8ddf\u52a8\u6001\u94fe\u63a5\u76f8\u5173\u7684\u7ed3\u6784\u5165\u624b\u5c06\u4f1a\u662f\u4e00\u4e2a\u5f88\u597d\u7684\u9014\u5f84\u3002ELF\u6587\u4ef6\u4e2d\u8ddf\u52a8\u6001\u94fe\u63a5\u76f8\u5173\u7684\u6bb5\u6709\u597d\u51e0\u4e2a\uff0c\u76f8\u4e92\u4e4b\u95f4\u7684\u5173\u7cfb\u4e5f\u6bd4\u8f83\u590d\u6742\uff0c\u6211\u4eec\u5148\u4ece ".dynamic" \u6bb5\u5165\u624b<\/p>

\u52a8\u6001\u94fe\u63a5ELF\u4e2d\u6700\u91cd\u8981\u7684\u7ed3\u6784\u5e94\u8be5\u662f\u201c .dynamic\u201d\u6bb5,\u8fd9\u4e2a\u6bb5\u91cc\u9762\u4fdd\u5b58\u4e86\u52a8\u6001\u94fe\u63a5\u5668\u6240\u9700\u8981\u7684\u57fa\u672c\u4fe1\u606f,\u6bd4\u5982\u4f9d\u8d56\u4e8e\u54ea\u4e9b\u5171\u4eab\u5bf9\u8c61\u3001\u52a8\u6001\u94fe\u63a5\u7b26\u53f7\u8868\u7684\u4f4d\u7f6e\u3001\u52a8\u6001\u94fe\u63a5\u91cd\u5b9a\u4f4d\u8868\u7684\u4f4d\u7f6e\u3001\u5171\u4eab\u5bf9\u8c61\u521d\u59cb\u5316\u4ee3\u7801\u7684\u5730\u5740\u7b49\u3002\u201c .dynamic\u201d\u6bb5\u7684\u7ed3\u6784\u5f88\u7ecf\u5178,\u5c31\u662f\u6211\u4eec\u5df2\u7ecf\u78b0\u5230\u8fc7\u7684ELF\u4e2d\u773c\u719f\u7684\u7ed3\u6784\u6570\u7ec4,\u7ed3\u6784\u5b9a\u4e49\u5728\u201celf.h\u201d\u4e2d:<\/p>

Elf32_Dyn \u7ed3\u6784\u7531\u4e00\u4e2a\u7c7b\u578b\u503c\u52a0\u4e0a\u4e00\u4e2a\u9644\u52a0\u7684\u6570\u503c\u6216\u6307\u9488\uff0c\u5bf9\u4e8e\u4e0d\u540c\u7c7b\u578b\uff0c\u540e\u9762\u9644\u52a0\u7684\u6570\u503c\u6216\u8005\u6307\u9488\u6709\u7740\u4e0d\u540c\u542b\u4e49\u3002\u6211\u4eec\u8fd9\u91cc\u5217\u4e3e\u51e0\u4e2a\u6bd4\u8f83\u5e38\u89c1\u7684\u7c7b\u578b\u503c\uff08\u8fd9\u4e9b\u503c\u90fd\u662f\u5b9a\u4e49\u5728\u201celf.h\u201d\u91cc\u9762\u7684\u5b8f\uff09\uff0c\u5982\u88687-2\u6240\u793a\uff1a<\/p>

\"\"<\/p>

\u88687-2\u4e2d\u53ea\u5217\u51fa\u4e86\u4e00\u90e8\u5206\u5b9a\u4e49\uff0c\u8fd8\u6709\u4e00\u4e9b\u4e0d\u592a\u5e38\u7528\u7684\u5b9a\u4e49\u6211\u4eec\u5c31\u6682\u4e14\u5ffd\u7565\uff0c\u5177\u4f53\u53ef\u4ee5\u53c2\u8003LSB\u624b\u518c\u548celf.h\u7684\u5b9a\u4e49\u3002\u4ece\u4e0a\u9762\u7ed9\u51fa\u7684\u5b9a\u4e49\u6765\u770b\uff0c\u201c.dynamic\u201d\u6bb5\u91cc\u9762\u4fdd\u5b58\u7684\u4fe1\u606f\u6709\u70b9\u50cfelf\u6587\u4ef6\u5934\uff0c\u53ea\u662f\u6211\u4eec\u770b\u5230\u7684elf\u6587\u4ef6\u5934\u4e2d\u4fdd\u5b58\u7684\u662f\u9759\u6001\u94fe\u63a5\u65f6\u7684\u76f8\u5173\u4fe1\u606f\uff0c\u6bd4\u5982\u9759\u6001\u94fe\u63a5\u65f6\u4f7f\u7528\u5230\u7684\u7b26\u53f7\u8868\u3001\u91cd\u5b9a\u4f4d\u8868\u7b49\uff0c\u8fd9\u91cc\u6362\u6210\u4e86\u52a8\u6001\u94fe\u63a5\u4e0b\u6240\u4f7f\u7528\u7684\u76f8\u5e94\u4fe1\u606f\u4e86\u3002\u6240\u4ee5\uff0c\u201c.dynamic\u201d\u6bb5\u53ef\u4ee5\u770b\u6210\u52a8\u6001\u94fe\u63a5\u4e0b\u7684ELF\u6587\u4ef6\u7684\u201c\u6587\u4ef6\u5934\u201d\u3002\u4f7f\u7528readelf\u5de5\u5177\u53ef\u4ee5\u67e5\u770b ".dynamic" \u6bb5\u7684\u5185\u5bb9<\/p>

\"\"<\/p>

\"\"<\/p>

\u53e6\u5916Linux\u8fd8\u63d0\u4f9b\u4e86\u4e00\u4e2a\u547d\u4ee4\u7528\u6765\u67e5\u770b\u4e00\u4e2a\u7a0b\u5e8f\u4e3b\u6a21\u5757\u6216\u4e00\u4e2a\u5171\u4eab\u5e93\u4f9d\u8d56\u4e8e\u54ea\u4e9b\u5171\u4eab\u5e93\uff1a<\/p>

\"\"<\/p>

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