These are personal WinDbg scripts used for various debugging tasks.
To use these scripts in WinDBG,
Ensure that the JS provider jsprovider.dll is loaded.
!load jsprovider.dll
It checks if a function is a valid call target and can be used to bypass CFG checks.
To load the script in WinDBG,
.scriptload C:\windbg_ext\scripts\cfg.js
with the usage,
0:032> !isvalidcalltarget "rpcrt4!NdrServerCall2"
[+] Target version is: Windows 10 Version 17763 MP (2 procs) Free x64
[+] Found CFG bitmap at: 0x7df5b9390000
[+] Found rpcrt4!NdrServerCall2 address at: 0x7ffa5faf7630
[+] Found rpcrt4!NdrServerCall2 bitmap entry: 0x28001040
[+] Found rpcrt4!NdrServerCall2 bitmap entry index: 0x6
@$isvalidcalltarget("rpcrt4!NdrServerCall2") : true
It allows manipulation of PTEs to disable SMEP.
To load the script in WinDBG,
.scriptload C:\windbg_ext\scripts\pte.js
with the usage,
0:032> !disablesmep 0x12345678
Makes use of template functions from https://github.com/hugsy/windbg_js_scripts.