{"id":1071,"date":"2011-11-09T12:28:20","date_gmt":"2011-11-09T04:28:20","guid":{"rendered":"http:\/\/115.29.108.60\/?p=1071"},"modified":"2011-11-10T14:38:19","modified_gmt":"2011-11-10T06:38:19","slug":"%e5%86%85%e5%ad%98%e8%ae%bf%e9%97%ae","status":"publish","type":"post","link":"http:\/\/115.29.108.60\/?p=1071","title":{"rendered":"\u5185\u5b58\u8bbf\u95ee"},"content":{"rendered":"

\u4ee3\u7801\u8bbf\u95ee\u5185\u5b58\u662f\u901a\u8fc7\u53e4\u8001\u7684\u6bb5+\u504f\u79fb\u7684\u65b9\u5f0f\u786e\u5b9a\u5185\u5b58\u5730\u5740\uff08\u903b\u8f91\u5730\u5740—>\u7ebf\u6027\u5730\u5740\uff09\uff0c\u4fdd\u62a4\u6a21\u5f0f\u4e0b\u6bb5\u5bc4\u5b58\u5668\u4e2d\u4fdd\u5b58\u7684\u5e76\u4e0d\u662f\u6bb5\u7684\u57fa\u5740\uff0c\u800c\u662f16\u4f4d\u7684\u6bb5\u9009\u62e9\u5b50\uff0c\u7531\u6bb5\u63cf\u8ff0\u7b26\u8868\u7684\u7d22\u5f15\u53f7\uff08\u5373\u9ad813\u4f4d\uff0c\u4f4e3\u4f4d\u7f6e0\u65f6\u5c31\u662f\u504f\u79fb\u91cf\u4e86\uff09+1\u4f4d TI+2\u4f4dRPL\u7ec4\u6210\u3002\u5176\u4e2dCS\u5bc4\u5b58\u5668\u7684\u4f4e\u4e24\u4f4d\u4fdd\u5b58\u7740\u5f53\u524d\u6b63\u5728\u6267\u884c\u7684\u4ee3\u7801\u6240\u5728\u7684\u6bb5\u7684\u7279\u6743\u7ea7\uff08CPL\uff09\uff0c\u800c\u6bb5\u63cf\u8ff0\u7b26\u8868\u4e2d\u53c8\u4fdd\u5b58\u7740DPL\uff0c\u56e0\u6b64\u7528\u6237\u7a7a\u95f4\u548c\u7cfb\u7edf\u7a7a\u95f4\u5f97\u4ee5\u5206\u79bb\u3002\u4e3e\u4f8b\u6765\u8bf4\uff0cRing3\u4e0b\u67d0\u8fdb\u7a0b\u8bbf\u95eeRing0\u4e2d\u7684\u6570\u636e\uff0cCPU\u4f1a\u5148\u4eceCS\u5bc4\u5b58\u5668\u4e2d\u53d6\u5f97CPL=3\uff0c\u7136\u540e\u6bd4\u8f83\u8981\u8bbf\u95ee\u7684\u6570\u636e\u6240\u5728\u6bb5\u7684\u6bb5\u63cf\u8ff0\u7b26DPL=0\uff0c\u5f53\u4e0d\u6ee1\u8db3CPL<=DPL\u65f6\uff0c\u4e3a\u8bbf\u95ee\u8fdd\u4f8b\u3002<\/p>\n

CPU\u53d6\u6307\u4e5f\u9700\u8981\u8bbf\u95ee\u5185\u5b58\uff0c\u4f46\u5e94\u8be5\u4e0d\u4f1a\u901a\u8fc7\u6bb5\u5bc4\u5b58\u5668—>\u6bb5\u63cf\u8ff0\u7b26\u8868—>\u6bd4\u8f83CPL\u548cDPL\u8fd9\u4e48\u590d\u6742\uff0c\u800c\u662f\u7531\u786c\u4ef6\u5b8c\u6210\uff0c\u56e0\u6b64\u72ec\u7acb\u7684\u4e00\u6bb5\u4ee3\u7801\u6bb5\u5e94\u8be5\u5728\u4e00\u81f4CPL\/RPL\u4e2d\u3002\u8981\u8df3\u8f6c\u5230\u975e\u4e00\u81f4\u7684\u4ee3\u7801\u6bb5\u5fc5\u987b\u901a\u8fc7\u7cfb\u7edf\u673a\u5236\uff08\u3010\u539f\u521b\u3011rootkit ring3\u8fdbring0\u4e4b\u95e8\u7cfb\u5217[\u4e00] — \u8c03\u7528\u95e8<\/a>\u3001\u3010\u6c42\u52a9\u3011\u5173\u4e8e\u5f02\u5e38\u53d1\u751f\u540e\u4fdd\u62a4\u6a21\u5f0f\u4e0b\u6743\u9650\u8f6c\u79fb\u7591\u60d1<\/a>\uff09\u3002<\/p>\n

\u6bb5\u9009\u62e9\u5b50<\/a><\/p>\n

\u7528\u6bd4\u55bb\u7c7b\u6bd4\u8bf4\u660eCPU\u7684\u7279\u6743\u7ea7DPL – CPL – RPL<\/a><\/p>\n

\u6bb5\u63cf\u8ff0\u7b26\u4f2a\u4ee3\u7801\uff1a<\/p>\n

union
\n{
\n\u00a0\u00a0\u00a0 struct
\n\u00a0\u00a0\u00a0 {
\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 unsigned short Segment Limit 0…15
\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 unsigned short Base Address 0…15
\n\u00a0\u00a0\u00a0 }
\n\u00a0\u00a0\u00a0 int 32
\n}
\nunion
\n{
\n\u00a0\u00a0\u00a0 struct
\n\u00a0\u00a0\u00a0 {
\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 unsigend char Base Address 16…23
\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 unsigend char TYPE 4bit\/S 1bit\/DPL 2bit\/P 1bit (\u5148\u5b9a\u4e49\u7684\u5728\u4f4e\u4f4d)
\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 unsigend char Segment Limit 16…19 4bit\/AVL 1bit\/Reserved 1bit\/D\/B 1bit\/G 1bit (\u5148\u5b9a\u4e49\u7684\u5728\u4f4e\u4f4d)
\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 unsigend char Base Address 24…31
\n\u00a0\u00a0\u00a0 }
\n\u00a0\u00a0\u00a0 int 32
\n}<\/p>\n

\u6bb5\u63cf\u8ff0\u7b26<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"

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