What to do if there is no VirtualProtectFromApp in masm libraries?

[alex-rudenkiy]

What to do if there is no VirtualProtectFromApp in masm libraries? :(

[jj2007]

Don't worry, for any standard program you will never need such an exotic function 8)

[hutch--]

Alex,

Write your own.  :P

[aw27]

And don't dare to use the Windows SDK libs. 

[TWell]

use it in dynamic way, using LoadLibrary/GetProcAddress
or make your own additional lib for kernel32 with polib.exe

example: kernel32_10.def

Code Select Expand

LIBRARY KernelBase.dll
EXPORTS
_VirtualProtectFromApp@16=VirtualProtectFromApp

EDIT: fix for wrong dll

[jj2007]

And, most important: show us your full code. We are a curious bunch

[Vortex]

VirtualProtectFromApp :

https://msdn.microsoft.com/en-us/library/windows/desktop/mt169846%28v=vs.85%29.aspx

Minimum supported client
   
Windows 10 [desktop apps | UWP apps]

[aw27]

The funny part is that I don't see this VirtualProtectFromApp in the Windows 10 kernel32.dll, it is also not available in the distributed Windows 10 Kit kernel32.lib. Of course, I am missing an obvious thing, I simply don't know what.

[TWell]

In Windows 10, it is in KernelBase.dll

[aw27]

In Windows 10, it is in KernelBase.dll

Yeap  :t, but still not in the supplied libs.

[adeyblue]

Yeap  :t, but still not in the supplied libs.

It is, quite a few of them

Code Select Expand

G:\SDK\10\Lib\10.0.14393.0\um\x86>findstr /M "VirtualProtectFromApp" *
mincore.lib
OneCore.Lib
OneCoreUAP.Lib
WindowsApp.lib

[aw27]

Yeap  :t, but still not in the supplied libs.

It is, quite a few of them

Code Select Expand

G:\SDK\10\Lib\10.0.14393.0\um\x86>findstr /M "VirtualProtectFromApp" *
mincore.lib
OneCore.Lib
OneCoreUAP.Lib
WindowsApp.lib

Wow, probably Microsoft <does not> know about that:
VirtualProtectFromApp function
Library: Kernel32.lib
DLL: Kernel32.dll

[TWell]

API Sets for Universal Windows Platform (UWP) apps

[Vortex]

What's the minimum build number of Windows 10 supporting VirtualProtectFromApp?

Code Select Expand

GetFileVersion.exe .\kernel32.dll
10.0.14393.0

\PellesC\bin\podump.exe /EXPORTS .\kernel32.dll | findstr "VirtualProtectFromApp"
No any result

[jj2007]

It works:

Code Select Expand

include \Masm32\MasmBasic\Res\JBasic.inc ; ## builds in 32- or 64-bit mode with ML64, Uasm etc
OldProtection dd ?

jd@150 equ KernelBase ; a little hack for a missing WinAPI,
j@VirtualProtectFromApp equ jbNextApi/150:s1111 ; may be refined in the near future

Init ; OPT_64 1 ; put 0 for 32 bit, 1 for 64 bit assembly
  PrintLine Chr$("This code was assembled with ", @AsmUsed$(1), " in ", jbit$, "-bit format")
  mov rbx, rv(VirtualAlloc, 0, 4096, MEM_RESERVE or MEM_COMMIT, PAGE_NOACCESS)
  usedeb=1
  deb 4, "VirtualAlloc:", x:rbx
  jinvoke VirtualProtectFromApp, rbx, 1024, PAGE_EXECUTE_READWRITE, addr OldProtection
  deb 4, "VirtualProtectFromApp:", rax, OldProtection
  PrintLine Err$()
  Inkey Chr$(jbit$, "-bit assembly is easy, it seems...")
EndOfCode

Code Select Expand

This code was assembled with HJWasm32 in 64-bit format
VirtualAlloc:   x:rbx   1b0000h
VirtualProtectFromApp:
rax     1
OldProtection   1

Can't find the key etc.

The error message is irrelevant, since rax is non-zero.

Same for the 32-bit version. This is Windows version 10.0, build 15063.