On: HelloAssembly: The smallest possible complete Windows application (2021)

[not_a9]

> This has nothing to do with ntdll at all.

I can only wonder where `NtMapViewOfSection` could be exported from...

[skrellm → not_a9]

Yeah, but the link talks about `ZwMapViewOfSection`. From that page:

> For calls from kernel-mode drivers, the NtXxx and ZwXxx versions of a Windows Native System Services routine can behave differently in the way that they handle and interpret input parameters.

How "differently" exactly? That's undocumented. And lots of other small (but very important) details are undocumented as well.

[not_a9 → skrellm]

> PS C:\Program Files\Microsoft Visual Studio\18\Community> dumpbin.exe /EXPORTS C:\Windows\System32\ntdll.dll | rg ZwMapViewOfSection

       2072  80F 001612B0 ZwMapViewOfSection

       2073  810 00163160 ZwMapViewOfSectionEx

> PS C:\Program Files\Microsoft Visual Studio\18\Community> dumpbin.exe /EXPORTS C:\Windows\System32\ntdll.dll | rg NtMapViewOfSection

        425  1A0 001612B0 NtMapViewOfSection

        426  1A1 00163160 NtMapViewOfSectionEx

> How "differently" exactly? That's undocumented.

https://learn.microsoft.com/en-us/windows-hardware/drivers/k...