[开发日志]游戏BUG—base64编码错误

w21k3r

错误日志信息：

1. <p>Failed calling InternetOpenUrl, GLE=12029
   
2. 
   
3. FAULTING_IP:
   
4. cshell!CGameClientShell::base64_encode+1e1 [f:\gamecode\suddensiege\clientshelldll\clientshellshared\gameclientshell.h @ 131]
   
5. 058cb341 8808            mov     byte ptr [eax],cl
   
6. 
   
7. EXCEPTION_RECORD:  ffffffff -- (.exr 0xffffffffffffffff)
   
8. ExceptionAddress: 058cb341 (cshell!CGameClientShell::base64_encode+0x000001e1)
   
9.    ExceptionCode: c0000005 (Access violation)
   
10.   ExceptionFlags: 00000000
    
11. NumberParameters: 2
    
12.    Parameter[0]: 00000001
    
13.    Parameter[1]: 0500d000
    
14. Attempt to write to address 0500d000
    
15. 
    
16. PROCESS_NAME:  engine1.exe
    
17. 
    
18. ADDITIONAL_DEBUG_TEXT:  
    
19. Use '!findthebuild' command to search for the target build information.
    
20. If the build information is available, run '!findthebuild -s ; .reload' to set symbol path and load symbols.
    
21. 
    
22. MODULE_NAME: cshell
    
23. 
    
24. FAULTING_MODULE: 76f50000 ntdll
    
25. 
    
26. DEBUG_FLR_IMAGE_TIMESTAMP:  6865e0f1
    
27. 
    
28. ERROR_CODE: (NTSTATUS) 0xc0000005 - 0x%p
    
29. 
    
30. EXCEPTION_CODE: (NTSTATUS) 0xc0000005 - 0x%p
    
31. 
    
32. EXCEPTION_PARAMETER1:  00000001
    
33. 
    
34. EXCEPTION_PARAMETER2:  0500d000
    
35. 
    
36. WRITE_ADDRESS:  0500d000
    
37. 
    
38. FOLLOWUP_IP:
    
39. cshell!CGameClientShell::base64_encode+1e1 [f:\gamecode\suddensiege\clientshelldll\clientshellshared\gameclientshell.h @ 131]
    
40. 058cb341 8808            mov     byte ptr [eax],cl
    
41. 
    
42. MOD_LIST: <ANALYSIS/>
    
43. 
    
44. FAULTING_THREAD:  000010a8
    
45. 
    
46. BUGCHECK_STR:  APPLICATION_FAULT_INVALID_POINTER_WRITE_WRONG_SYMBOLS
    
47. 
    
48. PRIMARY_PROBLEM_CLASS:  INVALID_POINTER_WRITE
    
49. 
    
50. DEFAULT_BUCKET_ID:  INVALID_POINTER_WRITE
    
51. 
    
52. LAST_CONTROL_TRANSFER:  from 058bcbe9 to 058cb341
    
53. 
    
54. STACK_TEXT:  
    
55. 0019e058 058bcbe9 0019e0fc 04f20830 04f20831 cshell!CGameClientShell::base64_encode+0x1e1 [f:\gamecode\suddensiege\clientshelldll\clientshellshared\gameclientshell.h @ 131]
    
56. 0019f138 05809b41 24ca350c 0019fa4c 003d156e cshell!CNetwork::CS_Chat+0xb9 [F:\gamecode\suddensiege\CLIENTSHELLDLL\ClientShellShared\Network.cpp @ 1932]
    
57. 0019f858 057ac6c3 00000044 00000001 00000000 cshell!CScreenRoom::OnCommand+0x1651 [F:\gamecode\suddensiege\ClientShellDLL\SA\ScreenRoom.cpp @ 2056]
    
58. 0019f8bc 05a4c951 00000044 00000001 00000000 cshell!CLTGUICommandHandler::SendCommand+0x23 [f:\gamecode\suddensiege\libs\ltguimgr\ltguicommandhandler.h @ 23]
    
59. 0019f920 05a4c5cf 0019fa4c 003d156e 0586f7a0 cshell!CLTGUIEditBox::OnEnter+0x31 [f:\gamecode\suddensiege\libs\ltguimgr\ltguieditbox.cpp @ 551]
    
60. 0019f97c 05a4b711 0000010d 0019fa4c 003d156e cshell!CLTGUIEditBox::OnChar+0x5f [f:\gamecode\suddensiege\libs\ltguimgr\ltguieditbox.cpp @ 450]
    
61. 0019f9e4 0586f7dc 003d156e 00000102 0000000d cshell!CImeCtrl::WndProc+0x1d1 [f:\gamecode\suddensiege\libs\ltguimgr\ltguieditbox.cpp @ 95]
    
62. 0019fa4c 74e0145b 003d156e 00000102 0000000d cshell!HookedWindowProc+0x3c [F:\gamecode\suddensiege\CLIENTSHELLDLL\ClientShellShared\GameClientShell.cpp @ 5008]
    
63. WARNING: Stack unwind information not available. Following frames may be wrong.
    
64. 0019fa78 74df7b4a 0586f7a0 003d156e 00000102 user32+0x4145b
    
65. 0019fb60 74df63f0 0586f7a0 00000000 00000102 user32+0x37b4a
    
66. 0019fbdc 74de81a0 0019fc8c 004098b8 0019fc08 user32+0x363f0
    
67. 0019fbe4 004098b8 0019fc08 00000064 00000000 user32+0x281a0
    
68. 0019fc8c 0040af97 00400000 39353336 6475535f engine1+0x98b8
    
69. 0019fed0 00630b93 00400000 00000000 00a15b65 engine1+0xaf97
    
70. 0019ff70 758cfcc9 0031e000 758cfcb0 0019ffdc engine1!SetMasterDatabase+0x1c4be6
    
71. 0019ff80 76fb82ae 0031e000 b759722e 00000000 kernel32+0x1fcc9
    
72. 0019ffdc 76fb827e ffffffff 76fd9343 00000000 ntdll+0x682ae
    
73. 0019ffec 00000000 006309e0 0031e000 00000000 ntdll+0x6827e
    
74. 
    
75. 
    
76. STACK_COMMAND:  ~0s; .ecxr ; kb
    
77. 
    
78. FAULTING_SOURCE_CODE:  
    
79.    127:                 size_t i;
    
80.    128:                 char *p = const_cast<char*>(ret.c_str());
    
81.    129:                 
    
82.    130:                 for (i = 0; i < in_len - 2; i += 3) {
    
83. >  131:                         *p++ = sEncodingTable[(data[i] >> 2) & 0x3F];
    
84.    132:                         *p++ = sEncodingTable[((data[i] & 0x3) << 4) | ((int) (data[i + 1] & 0xF0) >> 4)];
    
85.    133:                         *p++ = sEncodingTable[((data[i + 1] & 0xF) << 2) | ((int) (data[i + 2] & 0xC0) >> 6)];
    
86.    134:                         *p++ = sEncodingTable[data[i + 2] & 0x3F];
    
87.    135:                 }
    
88.    136:                 if (i < in_len) {
    
89. 
    
90. 
    
91. SYMBOL_STACK_INDEX:  0
    
92. 
    
93. SYMBOL_NAME:  cshell!CGameClientShell::base64_encode+1e1
    
94. 
    
95. FOLLOWUP_NAME:  MachineOwner
    
96. 
    
97. IMAGE_NAME:  cshell.dll
    
98. 
    
99. BUCKET_ID:  WRONG_SYMBOLS
    
100. 
     
101. FAILURE_BUCKET_ID:  INVALID_POINTER_WRITE_c0000005_cshell.dll!CGameClientShell::base64_encode
     
102. 
     

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错误原因分析：

1. 
   
2. CGameClientShell::base64_encode中char *p = const_cast<char*>(ret.c_str());
   
3. std::string::c_str() 返回的是一个指向以空字符结尾的常量字符数组的指针但是我去掉了const限制后强制访问导致越界。

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修复内容：

1. 不使用 const_cast 去修改 c_str() 返回的指针，使用 std::string 的 operator[] 来访问和修改字符串内容。

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