{"id":1984,"date":"2024-01-20T11:00:00","date_gmt":"2024-01-20T03:00:00","guid":{"rendered":"https:\/\/www.zhiwanyuzhou.com\/?p=1984"},"modified":"2024-01-19T14:16:56","modified_gmt":"2024-01-19T06:16:56","slug":"%e9%9d%9elinux%e5%9b%ba%e4%bb%b6%e5%8a%a0%e8%bd%bd%e5%9c%b0%e5%9d%80%e5%88%86%e6%9e%90","status":"publish","type":"post","link":"https:\/\/www.zhiwanyuzhou.com\/index.php\/2024\/01\/20\/%e9%9d%9elinux%e5%9b%ba%e4%bb%b6%e5%8a%a0%e8%bd%bd%e5%9c%b0%e5%9d%80%e5%88%86%e6%9e%90\/","title":{"rendered":"\u975eLinux\u56fa\u4ef6\u52a0\u8f7d\u5730\u5740\u5206\u6790"},"content":{"rendered":"\n

\u4e00\u3001\u5f15\u8a00<\/h2>\n\n\n\n

\u5728\u5206\u6790\u56fa\u4ef6\u7684\u65f6\u5019\uff0c\u6709\u65f6\u5019\u4f1a\u9047\u5230binwalk\u65e0\u6cd5\u89e3\u5305\u7684\u60c5\u51b5\uff0c\u67e5\u770b\u4fe1\u606f\u53d1\u73b0\u5b83\u662f\u975eLinux\u6587\u4ef6\u7cfb\u7edf\uff0c\u90a3\u4e48\u6709\u53ef\u80fd\u56fa\u4ef6\u662f\u5b9e\u65f6\u64cd\u4f5c\u7cfb\u7edf\uff0c\u5173\u4e8e\u5b9e\u65f6\u64cd\u4f5c\u7cfb\u7edf\uff0c\u5e38\u89c1\u7684\u6709Vxworks\u3001eCos\u3001FreeRTOS\u7b49\u3002\u8fd9\u91cc\u4ee5Zyxel\u7684RGS200-12P_1.00(ABEP.0)C0\u56fa\u4ef6\u4e3a\u4f8b\uff0c\u4f7f\u7528binwalk\u5206\u6790\u7ed3\u679c\u5982\u4e0b\uff1a<\/p>\n\n\n\n

$ binwalk RGS200-12P.bin \n\nDECIMAL       HEXADECIMAL     DESCRIPTION\n--------------------------------------------------------------------------------\n0             0x0             eCos kernel exception handler, architecture: MIPSEL, exception vector table base address: 0x80000200\n128           0x80            eCos kernel exception handler, architecture: MIPSEL, exception vector table base address: 0x80000200\n5444512       0x5313A0        Unix path: \/home\/remus\/svn\/ivs\/IVSPL5-ZyXEL_New\/src_0809\/src\/build\/..\/build\/obj\/ecos\/install\/include\/cyg\/libc\/stdlib\/atox.inl\n5444581       0x5313E5        eCos RTOS string reference: \"ecos\/install\/include\/cyg\/libc\/stdlib\/atox.inl\"\n5511365       0x5418C5        eCos RTOS string reference: \"ecos\/install\/include\/cyg\/libc\/time\/time.inl\"\n......<\/code><\/pre>\n\n\n\n
\u4e8c\u3001\u56fa\u4ef6\u5206\u6790<\/h2>\n\n\n\n
1\u3001\u53cd\u7f16\u8bd1<\/h4>\n\n\n\n
\u7531\u4e0a\u9762\u7684\u5206\u6790\u7ed3\u679c\u53ef\u77e5\u56fa\u4ef6\u4e3aeCos\u5b9e\u65f6\u64cd\u4f5c\u7cfb\u7edf\uff0c\u5e76\u4e14\u67b6\u6784\u4e3aMIPSEL\uff0c\u90a3\u4e48\u76f4\u63a5\u4f7f\u7528Ghidra\u53cd\u7f16\u8bd1\u5de5\u5177\u5206\u6790\u770b\u770b\u5427\u3002<\/p>\n\n\n\n
\"\"<\/figure>\n\n\n\n
\u9009\u62e9\u67b6\u6784MIPS\u5c0f\u7aef\uff0c\u70b9\u51fbOK\u540e\u9009\u62e9\u4e0d\u8fdb\u884c\u81ea\u52a8\u5206\u6790\u3002<\/p>\n\n\n\n
\"\"<\/figure>\n\n\n\n
\u901a\u8fc7\u53c2\u8003\u94fe\u63a5[3] \u6211\u4eec\u53ef\u4ee5\u77e5\u9053\u5b9e\u9645\u57fa\u5740\u4e3a0x80040000\uff0c\u6211\u4eec\u70b9\u51fb\u5185\u5b58\u4fee\u6539\u6309\u94ae\u4fee\u6539\u57fa\u5740\uff0c\u7136\u540e\u518d\u8fdb\u884c\u81ea\u52a8\u5206\u6790\uff0c\u5206\u6790\u7684\u8fc7\u7a0b\u6bd4\u8f83\u957f\u3002<\/p>\n\n\n\n
\"\"<\/figure>\n\n\n\n
\u5206\u6790\u5b8c\u540e\uff0c\u9009\u62e9\u83dc\u5355Windows-> Defined Strings\uff0c\u7136\u540e\u9009\u62e9\u4e00\u4e9b\u5b57\u7b26\u4e32\u8fdb\u884c\u67e5\u770b<\/p>\n\n\n\n
\"\"<\/figure>\n\n\n\n
\u8fd9\u91cc\u9009\u62e9\u4e86\u201c%-3d\u201d\u5b57\u7b26\u4e32\uff0c\u7136\u540e\u627e\u5230\u5bf9\u5e94\u7684\u5f15\u7528\u51fd\u6570\uff0c\u70b9\u51fb\u8fdb\u5165<\/p>\n\n\n\n
\"\"<\/figure>\n\n\n\n
\u627e\u5230\u5f15\u7528\u5b57\u7b26\u4e32\u7684\u51fd\u6570<\/p>\n\n\n\n
\"\"<\/figure>\n\n\n\n
\u591a\u627e\u51e0\u5904\u7c7b\u4f3c\u7684\uff0c\u8fd9\u91cc\u622a\u53d6\u90e8\u5206\u4ee3\u7801\u67e5\u770b\uff1a<\/p>\n\n\n\n
80046804 57 80 04 3c     lui        a0,0x8057\n80046808 21 28 00 02     move       a1,s0\n8004680c 1b e7 01 0c     jal        FUN_80079c6c\n80046810 50 cb 84 24     _addiu     a0=>s_%-3d_8056cb50,a0,-0x34b0      = \"%-3d \"\n......\n80111a90 5a 80 05 3c     lui        a1,0x805a\n80111a94 21 20 60 02     move       a0,s3\n80111a98 b0 28 a5 24     addiu      a1=>s_Error:_%s!_805a28b0,a1,0x28b0  = \"Error: %s!\\n\"<\/code><\/pre>\n\n\n\n
\u6c47\u7f16\u4ee3\u7801\u5206\u6790\uff0c\u4ee5\u6307\u4ee457 80 04 3c\u4e3a\u4f8b\uff0c\u56e0\u4e3a\u662f\u5c0f\u7aef\u6392\u5e8f\uff0c\u5b9e\u9645\u7684\u6307\u4ee4\u53ef\u4ee5\u7406\u89e3\u4e3a3c 04 80 57\uff0c\u5176\u4e2d3c 04\u4e3a\u64cd\u4f5c\u7801\uff08lui a0\uff09\uff0c80 57\u4e3a\u64cd\u4f5c\u6570\uff080x8057)\uff0c\u5176\u4ed6\u7684\u6307\u4ee4\u7406\u89e3\u65b9\u6cd5\u7c7b\u4f3c\u3002<\/p>\n\n\n\n
\u5730\u5740<\/td>\u6307\u4ee4<\/td>\u6307\u4ee4\u89e3\u91ca<\/td><\/tr>
0x80046804<\/td>57 80 04 3c<\/td>lui a0,0x8057\uff1a
a0=0x80570000 <\/td><\/tr>
0x80046810<\/td>50 cb 84 24<\/td>addiu  a0,a0,-0x34b0\uff1a
a0=0x80570000 -<\/mark> 0x34b0=0x8056cb5 (\"%-3d \")<\/td><\/tr>
0x80111a90<\/td>5a 80 05 3c<\/td>lui a1,0x805a\uff1a
a1=0x805a0000<\/td><\/tr>
0x80111a98<\/td>b0 28 a5 24<\/td>addiu a1,a1,0x28b0
a1=0x80580000 +<\/mark> 0x28b0=0x805a28b0 (\"Error: %s!\\n\")<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n
\u7531\u4e0a\uff0c\u53ef\u4ee5\u5f97\u51fa\uff1a<\/p>\n\n\n\n
\u51fd\u6570\u4e2d\u8868\u8fbe\u5f0f\u91cc\u9762\u7684\u5b57\u7b26\u4e32\u5730\u5740 = \u5b9e\u9645\u5b57\u7b26\u4e32\u5730\u5740<\/code><\/pre>\n\n\n\n
2\u3001\u52a0\u6cd5\u7684\u89c4\u5219<\/h4>\n\n\n\n
\u81f3\u4e8e50 cb 84 24\u7684\u64cd\u4f5c\u6570cb 50\u4e3a\u5565\u53d8\u6210\u8d1f\u6570-0x34b0\uff0c\u6211\u4eec\u53ef\u4ee5\u5199\u4e00\u5c0f\u6bb5\u6c47\u7f16\u6d4b\u8bd5\u4e00\u4e0b\uff1a<\/p>\n\n\n\n
lui $a0,0xa123\naddiu $a0,$a0,0x0001\nnop\nlui $a0,0xa123\naddiu $a0,$a0,0x7FFF\nnop\nlui $a0,0xa123\naddiu $a0,$a0,0x8000\nnop\nlui $a0,0xa123\naddiu $a0,$a0,0x8001\nnop\nlui $a0,0xa123\naddiu $a0,$a0,0xFFFF<\/code><\/pre>\n\n\n\n
\u4f7f\u7528gcc\u7f16\u8bd1\uff0c\u5e76\u7528objdump\u8fdb\u884c\u53cd\u6c47\u7f16<\/p>\n\n\n\n
$ mipsel-linux-gnu-gcc -c test.s -o test.o\n$ mipsel-linux-gnu-objdump -d test.o\ntest.o:     file format elf32-tradlittlemips\n\n\nDisassembly of section .text:\n\n00000000 <.text>:\n   0:\t3c04a123 \tlui\ta0,0xa123\n   4:\t24840001 \taddiu\ta0,a0,1\n   8:\t00000000 \tnop\n   c:\t3c04a123 \tlui\ta0,0xa123\n  10:\t24847fff \taddiu\ta0,a0,32767\n  14:\t00000000 \tnop\n  18:\t3c04a123 \tlui\ta0,0xa123\n  1c:\t24848000 \taddiu\ta0,a0,-32768\n  20:\t00000000 \tnop\n  24:\t3c04a123 \tlui\ta0,0xa123\n  28:\t24848001 \taddiu\ta0,a0,-32767\n  2c:\t00000000 \tnop\n  30:\t3c04a123 \tlui\ta0,0xa123\n  34:\t2484ffff \taddiu\ta0,a0,-1\n<\/code><\/pre>\n\n\n\n
\u53ef\u4ee5\u6e05\u695a\u7684\u770b\u51fa\u64cd\u4f5c\u657080 00\u4ee5\u540e\u5c31\u662f\u8d1f\u6570\uff0c\u90a3\u4e48\u64cd\u4f5c\u657080 00\u7b49\u4ef7\u4e8e-32768=-0x8000\uff0c\u64cd\u4f5c\u657080 01\u7b49\u4ef7\u4e8e-32767=-0x7FFF\uff0c\u64cd\u4f5c\u6570FF FF\u7b49\u4ef7\u4e8e-0x1\uff0c\u8ba1\u7b97\u65b9\u5f0f\u4e3a\uff1a<\/p>\n\n\n\n
\u5f53\u64cd\u4f5c\u657080 00 \u4ee5\u540e\u7684\u503c\uff0c\u5b9e\u9645\u6570\u503c=\u64cd\u4f5c\u6570-0x10000<\/code><\/pre>\n\n\n\n
3\u3001\u7ed3\u8bba<\/h4>\n\n\n\n
\u5f53\u57fa\u5740\u6b63\u786e\u65f6\uff0c\u5b9e\u9645\u5b57\u7b26\u4e32\u5730\u5740\u7b49\u4ef7\u4e8e\u57fa\u5740 + \u76f8\u5bf9\u5b57\u7b26\u4e32\u5730\u5740\uff1a<\/p>\n\n\n\n
\u51fd\u6570\u4e2d\u8868\u8fbe\u5f0f\u91cc\u9762\u7684\u5b57\u7b26\u4e32\u5730\u5740 = \u5b9e\u9645\u5b57\u7b26\u4e32\u5730\u5740 \n                             = \u57fa\u5740 + \u76f8\u5bf9\u5b57\u7b26\u4e32\u5730\u5740<\/code><\/pre>\n\n\n\n
\u90a3\u4e48\u57fa\u5740\u4e3a0\u65f6\uff0c\u5b9e\u9645\u7684\u57fa\u5740\u8ba1\u7b97\u65b9\u6cd5\u5982\u4e0b\uff1a<\/p>\n\n\n\n
\u57fa\u5740 = \u51fd\u6570\u4e2d\u8868\u8fbe\u5f0f\u91cc\u9762\u7684\u5b57\u7b26\u4e32\u5730\u5740 - \u76f8\u5bf9\u5b57\u7b26\u4e32\u5730\u5740<\/code><\/pre>\n\n\n\n
\u6709\u4e86\u4e0a\u9762\u7684\u5206\u6790\uff0c\u5f88\u6e05\u695a\u7684\u627e\u5230\u5bf9\u5e94\u5173\u7cfb\uff0c\u5982\u4e0b\u56fe\u6240\u793a\uff1a<\/p>\n\n\n\n
\"\"<\/figure>\n\n\n\n
\u627e\u5230\u51fd\u6570\u4e2d\u8868\u8fbe\u5f0f\u91cc\u9762\u7684\u5730\u5740(\u8bb0\u4f5csif_addr)\u3001\u76f8\u5bf9\u5b57\u7b26\u4e32\u5730\u5740(\u8bb0\u4f5csid_addr)\uff0c\u5f53sif_addr\u6709\u591a\u6b21\u5f15\u7528\u7684\u65f6\u5019\uff0c\u6b64\u5730\u5740\u5927\u6982\u7387\u4e3a\u5b9e\u9645\u7684\u5b57\u7b26\u4e32\u5730\u5740\uff0c\u6839\u636e\u5185\u5b58\u5206\u5e03\uff0c\u76f8\u5bf9\u5b57\u7b26\u4e32\u5730\u5740+\u57fa\u5740\u4e00\u822c\u4e0d\u4f1a\u6539\u53d8\u672b\u5c3e3\u4f4d\uff0c\u5373234\uff0c\u6700\u7ec8\u904d\u5386\u5168\u90e8\u7684\u6761\u4ef6\uff0c\u6392\u5e8f\u51fa\u5339\u914d\u6b21\u6570\u8f83\u9ad8\u7684sif_addr\uff0c\u7528sid_addr - sid_addr = \u5b9e\u9645\u7684\u57fa\u5740\u3002<\/p>\n\n\n\n
\u4e09\u3001\u81ea\u52a8\u5316\u4ee3\u7801<\/h2>\n\n\n\n
\uff081\uff09\u5339\u914d\u5927\u5c0f\u7aef\uff0c\u627e\u5230mips\u6c47\u7f16\u7684\u5e38\u89c1\u4ee3\u7801\uff0c\u5982jr $ra\uff1a\u5982\u679c08 00 e0 03\u90a3\u5c31\u662fMIPS\u5c0f\u7aef\uff0c\u53cd\u8fc7\u6765\u7684\u5c31\u662fMIPS\u5927\u7aef\u3002<\/p>\n\n\n\n
\"\"<\/figure>\n\n\n\n
\uff082\uff09\u5339\u914d\u5b57\u7b26\u4e32\uff0c\u627e\\x00\u5f00\u5934\u548c\\x00\u7ed3\u5c3e\uff0c\u4e2d\u95f4\u5747\u4e3a\u53ef\u89c1\u5b57\u7b26\u5c31\u662f\u5b57\u7b26\u4e32\uff1a<\/p>\n\n\n\n
\"\"<\/figure>\n\n\n\n
\uff083\uff09\u5339\u914dlui $a0, 0x????; addiu $a0, $a0, 0x????\u7b49\u8868\u8fbe\u5f0f\uff0c\u53d6\u51fa\u5176\u4e2d\u7684\u5730\u5740<\/p>\n\n\n\n
\"\"<\/figure>\n\n\n\n
\uff084\uff09\u627e\u6240\u6709\u53ef\u80fd\u7684\u57fa\u5740\uff0c\u4f7f\u7528\u51fd\u6570\u4e2d\u8868\u8fbe\u5f0f\u91cc\u9762\u7684\u5b57\u7b26\u4e32\u5730\u5740 - \u76f8\u5bf9\u5b57\u7b26\u4e32\u5730\u5740\uff0c\u7edf\u8ba1\u6392\u5e8f\u3002<\/p>\n\n\n\n
\u6839\u636e\u4ee5\u4e0a\u5206\u6790\u8fc7\u7a0b\u7f16\u5199\u4ee3\u7801\uff0c\u6267\u884c\u4ee3\u7801\u5206\u6790\u57fa\u5740\uff0c\u6548\u679c\u5982\u4e0b\uff0c\u53ef\u80fd\u7684\u57fa\u5740\u4e3a\u4ee5\u4e0b\u5730\u5740\uff08\u5217\u51fa\u524d10\uff0c\u6839\u636e\u91c7\u6837\u91cf\u7684\u60c5\u51b5\u90fd\u6709\u53ef\u80fd\u4e3a\u5b9e\u9645\u7684\u57fa\u5740<\/mark>\uff09\uff0c\u793a\u4f8b\u7a0b\u5e8f\u7684\u771f\u5b9e\u7684\u57fa\u5740\u4e3a0x80040000\uff0c\u521a\u597d\u5728\u524d10\u5217\u8868\u4e2d\uff1a<\/p>\n\n\n\n
$ python findimgbase.py -f RGS200-12P.bin\n[*] check endian\n    mips little endian\n[*] find string in Data\n    5055\n[*] find string in Func\n    lui $a0, 0x????; addiu $a0, $a0, 0x???? 7050\n    lui $a1, 0x????; addiu $a1, $a1, 0x???? 7481\n    lui $a2, 0x????; addiu $a2, $a2, 0x???? 2835\n    lui $a3, 0x????; addiu $a3, $a3, 0x???? 7772\n    lui $v0, 0x????; addiu $v0, $v0, 0x???? 3481\n    lui $v1, 0x????; addiu $v1, $v1, 0x???? 1738\n    lui $t1, 0x????; addiu $t1, $t1, 0x???? 8844\n    lui $t2, 0x????; addiu $t2, $t2, 0x???? 892\n    lui $v0, 0x????; addiu $a0, $v0, 0x???? 466\n[*] image base address: 2043\n(01) 0x80040000 70\n(02) 0x80064000 15\n(03) 0x80007000 13\n(04) 0x800e1000 13\n(05) 0x800a5000 13\n(06) 0x8007b000 13\n(07) 0x80087000 12\n(08) 0x8005e000 12\n(09) 0x80032000 12\n(10) 0x80076000 12<\/code><\/pre>\n\n\n\n
\u793a\u4f8b\u811a\u672c\u89c1gitee\uff1a<\/p>\n\n\n\n
https:\/\/gitee.com\/zhiwanyuzhou\/IoTools\/blob\/master\/imagebase\/findimgbase.py<\/a><\/p>\n\n\n\n
\u56db\u3001\u53c2\u8003\u94fe\u63a5<\/h2>\n\n\n\n
[1] https:\/\/zhuanlan.zhihu.com\/p\/483751376<\/a><\/p>\n\n\n\n
[2] https:\/\/bbs.kanxue.com\/thread-267719-1.htm<\/a><\/p>\n\n\n\n
[3] https:\/\/www.anquanke.com\/post\/id\/233361<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"
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