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goroh_kun

3DS gateway GW_INSTALLER ROP Code analysis(1)

goroh_kun
Jan 4th, 2014
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  1. goroh.kun@gmail.com
  2. 2014/01/04
  3.  
  4. ・まず実行されるコードは、eepromの0x1ffb4番地から。
  5. ・eeprom内のuser profileは0x1fe00～と0x1ff00～の2種類あって、update counter(0x1fe70, 0x1ff70)の値が
  6. 多いほうが使われる。このexploitでは0x1fe70の値が51, 0x1ff70の値が52なので、1ff00～が利用される。
  7. ・ここで、eepromの0x1fe00からまた別のコードを0x279400にロードして、Threadを起動。entrypointは0x1002f9, stackpointは0x279400へ。
  8. ・0x18f198からの関数にてSDカードを"YS:に"マウントしている。
  9. ・別Threadにて、YS:Launcher.datをオープンして、0x2b0000番地にロード、その後 sub_22efa8にておそらくロードしたバイナリを復号化している？
  10. ・その後、ropを0x2b0000から継続。
  11.  
  12. #########################
  13. # 3D gateway Installer
  14. #EEPROM 0x1ffb4
  15. #########################
  16. B9 F2 10 00 : PC ; POP {R0,R2,PC}
  17. 00 FE 01 00 : R0
  18. 00 01 00 00 : R2
  19. C4 4F 1C 00 : PC ; LDMFD SP!, {R1,PC}
  20. 00 94 27 00 : R1
  21. FC 34 13 00 : PC ; eeprom_read(0x1fe00, 0x279400, 0x100) ; return code LDMFD SP!, {R4,PC}
  22. FE FF FF FF : R4 ; Thread processorid CPUID0
  23. B1 49 15 00 : PC ; POP {R1-R3,PC}
  24. F9 02 10 00 : R1 ; Thread func entry point
  25. 00 00 00 00 : R2 ; Thread arg
  26. 00 94 27 00 : R3 ; Thread stacktop
  27. 8C 3D 14 00 : PC ; LDMFD SP!, {R0,PC}
  28. 2D 00 00 00 : R0 ; Thread Handle
  29. 90 B6 10 00 : PC ; SVC 8(create thread)
  30. F0 93 27 00 : ; thread result addr (R1 value)
  31. E8 93 27 00 : ; thread result addr (R4 value)
  32. 00 00 00 00 : ???
  33. 09 FB 19 00 : PC ; B loc_19FB08
  34. ; 無限ループ
  35.  
  36.  
  37. #########################
  38. #EEPROM 0x1fe00
  39. #loaded at 0x279400
  40. #########################
  41. B9 F2 10 00 : PC ; POP {R0,R2,PC}
  42. AE 2B 27 00 : R0 ; "YS:"
  43. ED 0D DC BA : R2 ; no use
  44. 9C F1 18 00 : PC ; mount_sd("YS:") ; return code LDMFD SP!, {R3-R5,PC}
  45. 90 B6 10 00 : R3
  46. 00 B0 FA 00 : R4
  47. 00 02 20 00 : R5
  48. B9 F2 10 00 : PC ; POP {R0,R2,PC}
  49. 00 90 27 00 : R0
  50. 01 00 00 00 : R2
  51. E1 49 15 00 : PC ; POP {R1,PC}
  52. 38 6F 27 00 : R1 ; "YS:/Launcher.dat"
  53. AC 82 1B 00 : PC ; IFile_Open(0x279000, "YS:/Launcher.dat", 0x1); return code LDMFD SP!, {R4-R8,PC}
  54. DC D5 18 00 : R4
  55. 40 83 27 00 : R5
  56. 00 02 10 00 : R6
  57. CC 48 00 00 : R7
  58. 60 3D 14 00 : R8
  59. B9 F2 10 00 : PC ; POP {R0,R2,PC}
  60. 00 90 27 00 : R0
  61. 00 00 2B 00 : R2
  62. 8C 53 10 00 : PC ; LDMFD SP!, {R3,PC}
  63. 00 90 00 00 : R3
  64. F9 02 10 00 : PC ; POP {PC}
  65. F9 02 10 00 : PC ; POP {PC}
  66. F9 02 10 00 : PC ; POP {PC}
  67. F9 02 10 00 : PC ; POP {PC}
  68. E1 49 15 00 : PC ; POP {R1,PC}
  69. 51 00 63 36 : R1 ; ### it's profile data counter and crc16 ###
  70. E1 49 15 00 : PC ; POP {R1,PC}
  71. 20 90 27 00 : R1
  72. 58 39 1B 00 : PC ; IFile_Read(0x279000, 0x279020, 0x2b0000, 0x9000); return code LDMFD SP!, {R4-R9,PC}
  73. E5 04 21 00 : R4
  74. 00 DA 19 00 : R5
  75. 00 75 01 00 : R6
  76. 86 DF 21 00 : R7
  77. 00 C1 1A 00 : R8
  78. 22 DA 1D 00 : R9
  79. 9B 44 1B 00 : PC ; POP {R0-R4,R7,PC}
  80. 00 01 10 00 : R0
  81. BC 4C 14 00 : R1
  82. 00 00 2B 00 : R2
  83. 00 90 00 00 : R3
  84. E1 49 15 00 : R4
  85. 77 77 77 77 : R7
  86. AC EF 22 00 : PC ; sub_22efa8(0x100100, 0x144cbc, 0x2b0000, 0x9000) ; return code LDMFD SP!, {R4-R8,PC}
  87. 88 5C 10 00 : R4
  88. 00 00 0E 00 : R5
  89. 90 03 25 00 : R6
  90. C0 FA 1E 00 : R7
  91. 91 FE 16 00 : R8
  92. 8C 53 10 00 : PC ; LDMFD SP!, {R3,PC}
  93. 28 6B 03 00 : R3
  94. 60 3D 14 00 : PC ;
  95. ROM:00143D60 03 D0 8D E0 ADD SP, SP, R3
  96. ROM:00143D64 04 F0 9D E4 LDR PC, [SP+4+var_4],#4
  97.  
  98. ########################
  99. 1st stage
  100. #loaded at 0x2b0000
  101. #########################
  102. B9 F2 10 00 : PC ; POP {R0,R2,PC}
  103. E0 FE 01 00 : R0
  104. 10 00 00 00 : R2
  105. C4 4F 1C 00 : PC ; LDMFD SP!, {R1,PC}
  106. 00 94 27 00 : R1
  107. FC 34 13 00 : PC ; eeprom_read(0x1fee0, 0x279400, 0x10) ; return code LDMFD SP!, {R4,PC}
  108. 44 44 44 44 : R4
  109. 8C 3D 14 00 : PC ; LDMFD SP!, {R0,PC}
  110. 00 94 27 00 : R0
  111. 2F F7 1A 00 : PC
  112. ;001AF72E LDR R0, [R0]
  113. ;001AF730 POP {R4,PC}
  114. ⇒ ここで、R0に0x9a7e0000が入るはず
  115. 44 44 44 44 : R4
  116. C4 4F 1C 00 : PC ; LDMFD SP!, {R1,PC}
  117. 01 00 7E 9A : R1
  118. 58 B2 18 00 : PC
  119. ;0018B258 CMP R0, R1
  120. ;0018B25C MOVEQ R0, #1
  121. ;0018B260 MOVNE R0, #0
  122. ;0018B264 LDMFD SP!, {R4,PC}
  123. ⇒ R1(0x9a7e0001)とR0(0x9a7e0000)との比較。ローダのバージョンを見てる
  124. ⇒ eur_jpn_kor(0x9a7e0000), taiwan(0x9a7e0001), china(0x9a7e0002)
  125. 44 44 44 44 : R4
  126. D4 14 10 00 : PC ; LDMFD SP!, {R4,PC}
  127. 84 7D 2B 00 : R4
  128. 8C 3D 14 00 : PC ; LDMFD SP!, {R0,PC}
  129. 88 01 27 00 : R0
  130. 18 CF 18 00 : PC
  131. ;0018CF18 STREQ R0, [R4,#0x24]
  132. ;0018CF1C LDMFD SP!, {R4,PC}
  133. ⇒ R1 == R0だったら、0x2b7d84+0x24=0x2b7da8に、0x270188を書き込む
  134. 44 44 44 44 : R4
  135. B9 F2 10 00 : PC ; POP {R0,R2,PC}
  136. E0 FE 01 00 : R0
  137. 10 00 00 00 : R2
  138. C4 4F 1C 00 : PC ; LDMFD SP!, {R1,PC}
  139. 00 94 27 00 : R1
  140. FC 34 13 00 : PC ; eeprom_read(0x1fee0, 0x279400, 0x10) ; return code LDMFD SP!, {R4,PC}
  141. 44 44 44 44 : R4
  142. 8C 3D 14 00 : PC ; LDMFD SP!, {R0,PC}
  143. 00 94 27 00 : R0
  144. 2F F7 1A 00 : PC
  145. ;RAM:001AF72E LDR R0, [R0]
  146. ;RAM:001AF730 POP {R4,PC}
  147. 44 44 44 44 : R4
  148. C4 4F 1C 00 : PC ; LDMFD SP!, {R1,PC}
  149. 02 00 7E 9A : R1
  150. 58 B2 18 00 : PC
  151. ;0018B258 CMP R0, R1
  152. ;0018B25C MOVEQ R0, #1
  153. ;0018B260 MOVNE R0, #0
  154. ;0018B264 LDMFD SP!, {R4,PC}
  155. ⇒ R1(0x9a7e0002)とR0(0x9a7e0000)との比較。ローダのバージョンを見てる
  156. ⇒ eur_jpn_kor(0x9a7e0000), taiwan(0x9a7e0001), china(0x9a7e0002)
  157. 44 44 44 44 : R4
  158. D4 14 10 00 : PC ; LDMFD SP!, {R4,PC}
  159. 48 01 2B 00 : R4
  160. 8C 3D 14 00 : PC ; LDMFD SP!, {R0,PC}
  161. E4 EF 22 00 : R0
  162. 18 CF 18 00 : PC
  163. ;0018CF18 STREQ R0, [R4,#0x24]
  164. ;0018CF1C LDMFD SP!, {R4,PC}
  165. ⇒ R1 == R0だったら、0x2b0148+0x24=0x2b016cに、0x22efe4を書き込む
  166. 44 44 44 44 : R4
  167. 08 30 10 00 : PC ; LDMFD SP!, {R4-R12,PC}
  168. E5 04 21 00 : R4
  169. 7C CF 2C 00 : R5
  170. 00 47 18 00 : R6
  171. 00 64 11 00 : R7
  172. 00 43 1B 00 : R8
  173. 00 32 11 00 : R9
  174. 00 B8 07 00 : R10
  175. 30 E6 21 00 : R11
  176. F9 02 10 00 : R12
  177. 28 43 1E 00 : PC
  178. ;001E4328 LDMFD SP!, {R4-R6,LR}
  179. ;001E432C BX R12
  180. 44 44 44 44 : R4
  181. 55 55 55 55 : R5
  182. 66 66 66 66 : R6
  183. F9 02 10 00 : LR
  184. ;001002F8 POP {PC}
  185. 8C 3D 14 00 : PC ; LDMFD SP!, {R0,PC}
  186. A8 7D 2B 00 : R0
  187. 4C 9A 19 00 : sub_199a48(0x2b7da8) ; return code
  188. ;00199A8C LDMFD SP!, {R4-R8}
  189. ;00199A90 BX LR
  190. ;001002F8 POP {PC}
  191. -----------------------------------------------------------------------
  192. AESの鍵の設定くさい
  193. -----------------------------------------------------------------------
  194. RAM:00199A4C MOV R1, #0
  195. RAM:00199A50 STR R1, [R0,#0x48]
  196. RAM:00199A54 STR R1, [R0,#0x4C]
  197. RAM:00199A58 LDR R2, =0x6A09E667
  198. RAM:00199A5C LDR R3, =0xBB67AE85
  199. RAM:00199A60 LDR R12, =0x3C6EF372
  200. RAM:00199A64 STR R1, [R0,#0x44]
  201. RAM:00199A68 ADD R1, R0, #0x50
  202. RAM:00199A6C LDR R4, =0xA54FF53A
  203. RAM:00199A70 LDR R5, =0x510E527F
  204. RAM:00199A74 LDR R6, =0x9B05688C
  205. RAM:00199A78 LDR R7, =0x1F83D9AB
  206. RAM:00199A7C LDR R8, =0x5BE0CD19
  207. RAM:00199A80 ADD R0, R0, #0x5C
  208. RAM:00199A84 STMIA R1, {R2,R3,R12}
  209. RAM:00199A88 STMIA R0, {R4-R8}
  210. RAM:00199A8C LDMFD SP!, {R4-R8}
  211. RAM:00199A90 BX LR
  212. -----------------------------------------------------------------------
  213. 84 0D 24 00 : R4
  214. 00 91 00 00 : R5
  215. 1A DC 2D 00 : R6
  216. 00 D6 05 00 : R7
  217. 3E 04 17 00 : R8
  218. B9 F2 10 00 : PC ; POP {R0,R2,PC}
  219. A8 7D 2B 00 : R0
  220. 70 00 00 00 : R2
  221. C4 4F 1C 00 : PC ; LDMFD SP!, {R1,PC}
  222. 50 62 70 00 : R1
  223. 38 62 1B 00 : sub_1b622c(0x2b7da8, 0x706250, 0x70); return code LDMFD SP!, {R4-R8,PC}
  224. 84 0D 24 00 : R4
  225. 00 C0 16 00 : R5
  226. 00 85 0F 00 : R6
  227. 12 C0 2A 00 : R7
  228. 7E 6D 1F 00 : R8
  229. 8C 3D 14 00 : PC ; LDMFD SP!, {R0,PC}
  230. A8 7D 2B 00 : R0
  231. C4 4F 1C 00 : PC ; LDMFD SP!, {R1,PC}
  232. 48 7E 2B 00 : R1
  233. D8 99 19 00 : sub_1999d4(0x2b7da8, 0x2b7e48); return code LDMFD SP!, {R4-R6,PC}
  234. 68 8F 10 00 : R4
  235. 00 8C 00 00 : R5
  236. 86 EB 24 00 : R6
  237. 9B 44 1B 00 : PC ; POP {R0-R4,R7,PC}
  238. 48 7E 2B 00 : R0
  239. BC 4C 14 00 : R1
  240. 88 01 2B 00 : R2
  241. 20 7C 00 00 : R3
  242. C4 4F 1C 00 : R4 ; LDMFD SP!, {R1,PC}
  243. 77 77 77 77 : R7
  244. AC EF 22 00 : sub_22efa8(0x2b7e48, 0x144cbc, 0x2b0188, 0x7c20) ; return code LDMFD SP!, {R4-R8,PC}
  245. ; china版では、0x22efe4にパッチされる
  246. ; ここで、0x2b0188～0x2b7da8のコードを復号化する
  247. 88 5C 10 00 : R4
  248. 00 00 0E 00 : R5
  249. 90 03 25 00 : R6
  250. C0 FA 1E 00 : R7
  251. 9B 44 1B 00 : R8
  252. F9 02 10 00 : PC ; POP {PC}
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