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[BUG/PRB.] VFP 9.0 FIX - THE COPY FILE MODE FOR THE COPY FILE COMMAND
January 2024
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CCB
1. BUG:
In Visual FoxPro Advanced 64-bit, when we run the COPY FILE command 6-10 times, sometimes vfp will crash.
There is a test program:
*PROC testcopyfilecommand
=STRTOFILE(REPL("a",10),"test.tmp")
FOR m.n1=1 TO 10
?m.n1
COPY FILE ("test.tmp") TO ("test2.tmp")
=INKEY(0.5)
NEXT
RETURN
* END OF PROC TESTCOPYFILECOMMAND.
2. CAUSE:
For Windows Defender, there are 2 processes on Windows 10 version 1903 or later:
Antimalware Service Executable (MsMpEng.exe)
Microsoft Malware Protection Copy Accelerator Utility (MpCopyAccelerator.exe)
there are some compatible problems for Visual FoxPro Advanced 64-bit
and Microsoft Malware Protection Copy Accelerator Utility (MpCopyAccelerator.exe).
It seems MpCopyAccelerator.exe creates a new thread,
but the ThreadStartAddress is incorrect,
and then it causes an Access Violation Exception (exception code 0xC0000005)!!!
For Windows Defender, there is only 1 process on some Windows old versions:
Antimalware Service Executable (MsMpEng.exe)
there is no any compatible problems.
3. RESOLUTION:
We can write some code to fix the BUG.
vfpa_copyfilea_mode :: ; proc near
push ebp
mov ebp,esp
sub esp,60h
push ebx
push esi
push edi
cmp dword ptr vfpa_sys9122_data,01h
je vfpa_copyfilea_mode1_start0
cmp dword ptr vfpa_sys9122_data,02h
je vfpa_copyfilea_mode2_start0
jmp vfpa_copyfilea_mode_end
vfpa_copyfilea_mode1_start0:
cmp dword ptr [ebp+10h],00h
je vfpa_copyfilea_mode1_start1
push 00h
push 80h ; FILE_ATTRIBUTE_NORMAL
push 03h ; OPEN_EXISTING
push 00h
push 00h
push 080000000h ; GENERIC_READ
push dword ptr [ebp+0Ch]
call CreateFileA
test eax,eax
jl vfpa_copyfilea_mode1_start1
push eax
call CloseHandle
jmp vfpa_copyfilea_mode1_end0
vfpa_copyfilea_mode1_end0:
xor eax,eax
jmp vfpa_copyfilea_mode_end
vfpa_copyfilea_mode1_start1:
call GetProcessHeap
mov dword ptr [ebp-30h],eax
push 8000h
push 00h
push dword ptr [ebp-30h]
call HeapAlloc
mov dword ptr [ebp-30h][8],eax
test eax,eax
je vfpa_copyfilea_mode1_end1
jmp vfpa_copyfilea_mode1_start2
vfpa_copyfilea_mode1_end1:
xor eax,eax
jmp vfpa_copyfilea_mode_end
vfpa_copyfilea_mode1_start2:
push 00h
push 80h ; FILE_ATTRIBUTE_NORMAL
push 03h ; OPEN_EXISTING
push 00h
push 00h
push 080000000h ; GENERIC_READ
push dword ptr [ebp+08h]
call CreateFileA
mov dword ptr [ebp-10h],eax
test eax,eax
jl vfpa_copyfilea_mode1_end2
jmp vfpa_copyfilea_mode1_start3
vfpa_copyfilea_mode1_end2:
push dword ptr [ebp-30h][8]
push 00h
push dword ptr [ebp-30h]
call HeapFree
xor eax,eax
jmp vfpa_copyfilea_mode_end
vfpa_copyfilea_mode1_start3:
push 00h
push 80h ; FILE_ATTRIBUTE_NORMAL
push 02h ; CREATE_ALWAYS
push 00h
push 00h
push 0C0000000h ; GENERIC_READ or GENERIC_WRITE
push dword ptr [ebp+0Ch]
call CreateFileA
mov dword ptr [ebp-10h][8],eax
test eax,eax
jl vfpa_copyfilea_mode1_end3
jmp vfpa_copyfilea_mode1_start4
vfpa_copyfilea_mode1_end3:
push dword ptr [ebp-30h][8]
push 00h
push dword ptr [ebp-30h]
call HeapFree
push dword ptr [ebp-10h]
call CloseHandle
xor eax,eax
jmp vfpa_copyfilea_mode_end
vfpa_copyfilea_mode1_start4:
mov dword ptr [ebp-20h],00h
push 00h
lea eax,dword ptr [ebp-20h]
push eax
push 8000h
mov eax,dword ptr [ebp-30h][8]
push eax
push dword ptr [ebp-10h]
call ReadFile
test eax,eax
je vfpa_copyfilea_mode1_end4
cmp dword ptr [ebp-20h],00h
je vfpa_copyfilea_mode1_end4
mov dword ptr [ebp-20h][8],00h
push 00h
lea eax,dword ptr [ebp-20h][8]
push eax
push dword ptr [ebp-20h]
mov eax,dword ptr [ebp-30h][8]
push eax
push dword ptr [ebp-10h][8]
call WriteFile
test eax,eax
je vfpa_copyfilea_mode1_end4
cmp dword ptr [ebp-20h][8],00h
je vfpa_copyfilea_mode1_end4
jmp vfpa_copyfilea_mode1_start4
vfpa_copyfilea_mode1_end4:
push dword ptr [ebp-30h][8]
push 00h
push dword ptr [ebp-30h]
call HeapFree
lea eax,dword ptr [ebp-60h]
push eax
lea eax,dword ptr [ebp-50h]
push eax
lea eax,dword ptr [ebp-40h]
push eax
push dword ptr [ebp-10h]
call GetFileTime
lea eax,dword ptr [ebp-60h]
push eax
lea eax,dword ptr [ebp-50h]
push eax
lea eax,dword ptr [ebp-40h]
push eax
push dword ptr [ebp-10h][8]
call SetFileTime
push dword ptr [ebp-10h]
call CloseHandle
push dword ptr [ebp-10h][8]
call CloseHandle
mov eax,01h
jmp vfpa_copyfilea_mode_end
vfpa_copyfilea_mode2_start0:
cmp dword ptr [ebp+10h],00h
je vfpa_copyfilea_mode2_start1
push 00h
push 80h ; FILE_ATTRIBUTE_NORMAL
push 03h ; OPEN_EXISTING
push 00h
push 00h
push 080000000h ; GENERIC_READ
push dword ptr [ebp+0Ch]
call CreateFileA
test eax,eax
jl vfpa_copyfilea_mode2_start1
push eax
call CloseHandle
jmp vfpa_copyfilea_mode2_end0
vfpa_copyfilea_mode2_end0:
xor eax,eax
jmp vfpa_copyfilea_mode_end
vfpa_copyfilea_mode2_start1:
lea eax,vfpa_copyfilea_runcopy_file
push eax
lea eax,vfpa_copyfilea_runcopy_commandline
push eax
call lstrcpyA
lea eax,vfpa_copyfilea_runcopy_space
push eax
lea eax,vfpa_copyfilea_runcopy_commandline
push eax
call lstrcatA
lea eax,vfpa_copyfilea_runcopy_para0
push eax
lea eax,vfpa_copyfilea_runcopy_commandline
push eax
call lstrcatA
lea eax,vfpa_copyfilea_runcopy_space
push eax
lea eax,vfpa_copyfilea_runcopy_commandline
push eax
call lstrcatA
lea eax,vfpa_copyfilea_runcopy_quotationmark
push eax
lea eax,vfpa_copyfilea_runcopy_commandline
push eax
call lstrcatA
push dword ptr [ebp+08h]
lea eax,vfpa_copyfilea_runcopy_commandline
push eax
call lstrcatA
lea eax,vfpa_copyfilea_runcopy_quotationmark
push eax
lea eax,vfpa_copyfilea_runcopy_commandline
push eax
call lstrcatA
lea eax,vfpa_copyfilea_runcopy_space
push eax
lea eax,vfpa_copyfilea_runcopy_commandline
push eax
call lstrcatA
lea eax,vfpa_copyfilea_runcopy_quotationmark
push eax
lea eax,vfpa_copyfilea_runcopy_commandline
push eax
call lstrcatA
push dword ptr [ebp+0Ch]
lea eax,vfpa_copyfilea_runcopy_commandline
push eax
call lstrcatA
lea eax,vfpa_copyfilea_runcopy_quotationmark
push eax
lea eax,vfpa_copyfilea_runcopy_commandline
push eax
call lstrcatA
vfpa_copyfilea_mode2_start2:
push dword ptr vfpa_sys9074_data
call Sleep
xor eax , eax
mov dword ptr vfpa_copyfilea_runcopy_startinfo[00h],44h
mov dword ptr vfpa_copyfilea_runcopy_startinfo[04h],eax
mov dword ptr vfpa_copyfilea_runcopy_startinfo[08h],eax
mov dword ptr vfpa_copyfilea_runcopy_startinfo[0Ch],eax
mov dword ptr vfpa_copyfilea_runcopy_startinfo[10h],eax
mov dword ptr vfpa_copyfilea_runcopy_startinfo[14h],eax
mov dword ptr vfpa_copyfilea_runcopy_startinfo[18h],eax
mov dword ptr vfpa_copyfilea_runcopy_startinfo[1Ch],eax
mov dword ptr vfpa_copyfilea_runcopy_startinfo[20h],eax
mov dword ptr vfpa_copyfilea_runcopy_startinfo[24h],eax
mov dword ptr vfpa_copyfilea_runcopy_startinfo[28h],eax
mov dword ptr vfpa_copyfilea_runcopy_startinfo[2Ch],81h ; STARTF_USESHOWWINDOW or STARTF_FORCEOFFFEEDBACK
mov dword ptr vfpa_copyfilea_runcopy_startinfo[30h],eax ; SW_HIDE
mov dword ptr vfpa_copyfilea_runcopy_startinfo[34h],eax
mov dword ptr vfpa_copyfilea_runcopy_startinfo[38h],eax
mov dword ptr vfpa_copyfilea_runcopy_startinfo[3Ch],eax
mov dword ptr vfpa_copyfilea_runcopy_startinfo[40h],eax
mov dword ptr vfpa_copyfilea_runcopy_procinfo[00h],eax
mov dword ptr vfpa_copyfilea_runcopy_procinfo[04h],eax
mov dword ptr vfpa_copyfilea_runcopy_procinfo[08h],eax
mov dword ptr vfpa_copyfilea_runcopy_procinfo[0Ch],eax
lea eax,byte ptr vfpa_copyfilea_runcopy_procinfo
push eax
lea eax,byte ptr vfpa_copyfilea_runcopy_startinfo
push eax
push 00h
push 00h
push 00h
push 00h
push 00h
push 00h
lea eax,byte ptr vfpa_copyfilea_runcopy_commandline
push eax
push 00h
call CreateProcessA
test eax,eax
je vfpa_copyfilea_mode2_end2
cmp dword ptr vfpa_copyfilea_runcopy_procinfo[00h],00h
je vfpa_copyfilea_mode2_end2
jmp vfpa_copyfilea_mode2_start3
vfpa_copyfilea_mode2_end2:
xor eax,eax
jmp vfpa_copyfilea_mode_end
vfpa_copyfilea_mode2_start3:
push 07FFFFFFFh
push dword ptr vfpa_copyfilea_runcopy_procinfo[00h]
call WaitForSingleObject
test eax,eax
jne vfpa_copyfilea_mode2_end3
jmp vfpa_copyfilea_mode2_start4
vfpa_copyfilea_mode2_end3:
xor eax,eax
jmp vfpa_copyfilea_mode_end
vfpa_copyfilea_mode2_start4:
push dword ptr vfpa_sys9074_data
call Sleep
push 00h
push 80h ; FILE_ATTRIBUTE_NORMAL
push 03h ; OPEN_EXISTING
push 00h
push 00h
push 080000000h ; GENERIC_READ
push dword ptr [ebp+0Ch]
call CreateFileA
test eax,eax
jl vfpa_copyfilea_mode2_end4
push eax
call CloseHandle
mov eax,01h
jmp vfpa_copyfilea_mode_end
vfpa_copyfilea_mode2_end4:
xor eax,eax
jmp vfpa_copyfilea_mode_end
vfpa_copyfilea_mode_end:
pop edi
pop esi
pop ebx
mov esp,ebp
pop ebp
ret 0Ch
; vfpa_copyfilea_mode endp
4. APPLIES TO:
VFP 10 (VFP Advanced)
IMPORTANT NOTE FOR WINDOWS 10:
There are some compatible problems for Visual FoxPro Advanced 64-bit and Windows Defender on Windows 10 version 1903 or later,
so recommend to set SYS(9122,1) (the default setting) or SYS(9122,2) in Visual FoxPro Advanced 64-bit.
5. REFERENCE WEBSITES:
1, baiyujia.com:
http://www.baiyujia.com
http://www.baiyujia.com/vfpdocuments/f_vfp9fix249.asp
2, wublub.cn:
http://www.wublub.cn/index.php/archives/705/
3, microsoft.com:
https://learn.microsoft.com/en-us/answers/questions/747179/windows-defender-copy-protection-interferes-with-o
6. OTHER:
For reference only, there is no guarantees.
Any questions or suggestions, please send me an email at ccb2000@163.com.
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