OSR Open Systems Resources, Inc.

Last Update: 9 May 2024 TL;DR Starting sometime with Windows 11 Microsoft changed Windows Driver Verifier to no longer bug check or breakpoint when it encounters most issues. Instead, it (silently) writes an entry to the system event log. This change was neither announced nor documented by Microsoft. So, in short, we've all been testing our drivers using Windows Driver Verifier on Windows 11 for years, expecting it to actively tell us if we've made serious mistakes....

HUGE Change in Driver Verifier == HUGE Problem for the Community Last Update: 9 May 2024 TL;DR Starting sometime with Windows 11 Microsoft changed Windows Driver Verifier to no longer bug check or breakpoint when it encounters most issues. Instead, it (silently)…

Great! But did you know that even the "Driver Recommended" rule set leaves out a lot of useful tests? We are indeed extremely fortunate to have the tooling that is available to us for Windows driver development. Static tools such as Code Analysis (CA) and Static Driver Verifier (SDV), coupled with dynamic tools like Windows Driver Verifier and WDF Verifier make it much easier to avoid problems that aren't always evident during basic in-house testing....

It Passes Code Analysis Great! But did you know that even the “Driver Recommended” rule set leaves out a lot of useful tests? We are indeed extremely fortunate to have the tooling that is available to us for W…

Getting WinDbg to Work Over KDNet on a VM Hosted by QEMU-KVM

Using WinDbg Over KDNet on QEMU-KVM We spent several months working on a very intensive (and very interesting) project that required a writing a driver that was specifically intended to run on a Windows system running under QEMU-KVM …

We were surprised by a Tweet claiming that simply accessing a path caused NTFS to report the volume as corrupt: We met this with great skepticism (how could that possibly be??) but seems to have a strange knack for finding these sorts of things. After a bit of delay the magic path was revealed and, as advertised, triggered a very ugly warning:...

Mitigating the $I30:$Bitmap NTFS Bug We were surprised by a Tweet claiming that simply accessing a path caused NTFS to report the volume as corrupt: We met this with great skepticism (how could that possibly be??) but seems t…

The Windows 2004 WDK/EWDK have been updated to mitigate the previously reported ExAllocatePoolZero Security Vulnerabilities. Read about what you should do now.

Mitigations and Best Practices for ExAllocatePoolZero Security Vulnerabilities tl;dr The Windows V2004 WDK/EWDK had a serious security vulnerability. It has been updated to mitigate that vulnerability, and you should update all of your machines that have the WDK/EWDK installe…