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[ENHANCED] VFP 9.0 FIX - SYS(9038) SETS OR RETURNS THE REQUEST EXECUTION LEVEL OF THE COMPILED EXECUTABLE FILES
January 2024
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CCB
1. THE SYS(9038) FUNCTION:
SYS(9038) - Sets or returns the request execution level of the compiled executable files
Sets or returns the request execution level of the compiled executable files.
SYS(9038 [, -1 | 0 | 1 | 2])
Parameters
-1
No requesting execution level, VFP Advanced will not write the manifest data <requestedExecutionLevel> into the compiled executable files.
0
Requesting no additional permissions, VFP Advanced will write the manifest data <requestedExecutionLevel level="asInvoker" />
into the compiled executable files. 0 is the startup default for Visual FoxPro Advanced.
1
Requesting the highest permissions available, VFP Advanced will write the manifest data <requestedExecutionLevel level="highestAvailable" />
into the compiled executable files.
2
Requesting full administrator permissions, VFP Advanced will write the manifest data <requestedExecutionLevel level="requireAdministrator" />
into the compiled executable files.
Return Value
Character
Remarks
The SYS(9038) function is only used in the Visual FoxPro Advanced Interactive Development Environment (IDE).
We can also set the default value in the Windows registry:
HKEY_CURRENT_USER\Software\Microsoft\VisualFoxPro\10.n\Options\RequestExecutionLevel (for Visual FoxPro Advanced 32-bit),
HKEY_CURRENT_USER\Software\Microsoft\VisualFoxPro64\10.n\Options\RequestExecutionLevel (for Visual FoxPro Advanced 64-bit),
for example, RequestExecutionLevel = "0".
If we set SYS(9038,-1) in Visual FoxPro Advanced 32-bit, Windows enableds UAC virtualization for the compiled executable files,
it is the same as Visual FoxPro 9.0 and earlier versions.
If we set SYS(9038, 0 | 1 | 2) in Visual FoxPro Advanced 32-bit, Windows disables UAC virtualization for the compiled executable files.
If we set SYS(9038, -1 | 0 | 1 | 2) in Visual FoxPro Advanced 64-bit, Windows disables UAC virtualization for the compiled executable files,
because Windows always disables UAC virtualization for 64-bit executable files.
For more information about UAC virtualization, please refer to:
https://docs.microsoft.com/en-us/windows/security/identity-protection/user-account-control/how-user-account-control-works
Most app tasks operate properly by using virtualization features. Although virtualization allows a majority of applications to run,
it is a short-term fix and not a long-term solution. App developers should modify their apps to be compliant as soon as possible,
rather than relying on file, folder, and registry virtualization.
Virtualization is not an option in the following scenarios:
Virtualization does not apply to apps that are elevated and run with a full administrative access token.
Virtualization supports only 32-bit apps. Non-elevated 64-bit apps simply receive an access denied message when they attempt to acquire
a handle (a unique identifier) to a Windows object.
Native Windows 64-bit apps are required to be compatible with UAC and to write data into the correct locations.
Virtualization is disabled if the app includes an app manifest with a requested execution level attribute.
IMPORTANT NOTE:
If we change the request execution level of an executable file, or we do some Windows Updates,
perhaps we need to logout or restart the computer,
and then it works fine.
2. CAUSE:
There are some BUGs in the following code.
3. RESOLUTION:
We can write some code to fix the BUG.
Fun529fca :: ; proc near
push ebp ;0x00529fca : 55
mov ebp , esp ;0x00529fcb : 8bec
pushd 0FFFFFFFFh ;0x00529fcd : 6aff
pushd offset Data922268 ;0x00529fcf : 6868229200
pushd offset Label9160f9 ;0x00529fd4 : 68f9609100
mov eax , dword ptr fs:[00h] ;0x00529fd9 : 64a100000000
push eax ;0x00529fdf : 50
mov dword ptr fs:[00h] , esp ;0x00529fe0 : 64892500000000
push ecx ;0x00529fe7 : 51
push ecx ;0x00529fe8 : 51
mov eax , 02FBCh ;0x00529fe9 : b8bc2f0000
call Fun42c118 ;0x00529fee : e82521f0ff
mov eax , dword ptr [ Data937090 ] ;0x00529ff3 : a190709300
mov dword ptr [ ebp - 28 ] , eax ;0x00529ff8 : 8945e4
push ebx ;0x00529ffb : 53
push esi ;0x00529ffc : 56
push edi ;0x00529ffd : 57
mov dword ptr [ ebp - 24 ] , esp ;0x00529ffe : 8965e8
xor edi , edi ;0x0052a001 : 33ff
mov dword ptr [ ebp + 0FFFFD114h ] , edi ;0x0052a003 : 89bd14d1ffff
push edi ;0x0052a009 : 57
pushd 02710h ;0x0052a00a : 6810270000
push edi ;0x0052a00f : 57
mov ebx , dword ptr [ ebp + 8 ] ;0x0052a010 : 8b5d08
mov eax , ebx ;0x0052a013 : 8bc3
call Fun529bc5 ;0x0052a015 : e8abfbffff
mov dword ptr [ ebp + 0FFFFD0E4h ] , eax ;0x0052a01a : 8985e4d0ffff
mov dword ptr [ ebp + 0FFFFD10Ch ] , edi ;0x0052a020 : 89bd0cd1ffff
lea ecx , dword ptr [ ebp + 0FFFFFDE0h ] ;0x0052a026 : 8d8de0fdffff
mov dword ptr [ ebp + 0FFFFD100h ] , ecx ;0x0052a02c : 898d00d1ffff
mov byte ptr [ ebp + 0FFFFFDE0h ] , 00h ;0x0052a032 : c685e0fdffff00
movsx eax , ax ;0x0052a039 : 0fbfc0
;
; --------------------------------------------------------------------------------------------------------------
; VFP 9.0 FIX - SYS(9038) SETS OR RETURNS THE REQUEST EXECUTION LEVEL OF THE COMPILED EXECUTABLE FILES
; September 2020
; --------------------------------------------------------------------------------------------------------------
; CCB
;
; SYS(9038) - Sets or returns the request execution level of the compiled executable files.
;
; 2020/9/30, by ccb
;
cmp eax,9038
je vfpa_sys9038_start
pushd 064h ;0x0052a03c : 6a64
pop esi ;0x0052a03e : 5e
cmp eax , esi ;0x0052a03f : 3bc6
jle Label52a0d0 ;0x0052a041 : 0f8e89001000
mov ecx , 07EAh ;0x0052a047 : b9ea070000
cmp eax , ecx ;0x0052a04c : 3bc1
jg Label52a164 ;0x0052a04e : 0f8f10010000
je Label609b33 ;0x0052a054 : 0f84d9fa0d00
mov ecx , 04F6h ;0x0052a05a : b9f6040000
cmp eax , ecx ;0x0052a05f : 3bc1
jle Label52b6e0 ;0x0052a061 : 0f8e79160000
mov ecx , 07DBh ;0x0052a067 : b9db070000
cmp eax , ecx ;0x0052a06c : 3bc1
jg Label51f355 ;0x0052a06e : 0f8fe152ffff
je Label609700 ;0x0052a074 : 0f8486f60d00
add ecx , 0FFFFFFF9h ;0x0052a07a : 83c1f9
cmp eax , ecx ;0x0052a07d : 3bc1
jg Label4a4938 ;0x0052a07f : 0f8fb3a8f7ff
je Label4f6b07 ;0x0052a085 : 0f847ccafcff
sub eax , 04F7h ;0x0052a08b : 2df7040000
je Label60951e ;0x0052a090 : 0f8488f40d00
dec eax ;0x0052a096 : 48
je Label60950f ;0x0052a097 : 0f8472f40d00
sub eax , 0E4h ;0x0052a09d : 2de4000000
je Label609492 ;0x0052a0a2 : 0f84eaf30d00
sub eax , 01F4h ;0x0052a0a8 : 2df4010000
jne Label462026 ;0x0052a0ad : 0f85737ff3ff
lea eax , dword ptr [ ebp + 0FFFFFDE0h ] ;0x0052a0b3 : 8d85e0fdffff
push eax ;0x0052a0b9 : 50
push dword ptr [ ebp + 12 ] ;0x0052a0ba : ff750c
mov edx , ebx ;0x0052a0bd : 8bd3
call Fun4dc923 ;0x0052a0bf : e85f28fbff
4. APPLIES TO:
VFP 10 (VFP Advanced)
5. REFERENCE WEBSITES:
1, baiyujia.com:
http://www.baiyujia.com
http://www.baiyujia.com/vfpdocuments/f_vfp9fix130.asp
http://www.baiyujia.com/vfpdocuments/f_vfp9fix127.asp
http://www.baiyujia.com/vfpdocuments/f_vfp9fix128.asp
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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