
During February 2026, Toribio Moreno developed runtime hotpatching for the MSQuic kernel driver in the microsoft/msquic repository, enabling zero-downtime updates on both x64 and ARM64 architectures. He implemented architecture-specific linker configurations and in-memory patching techniques using C++ and Windows kernel development skills, allowing msquic.sys to be updated without restarts or user-facing API changes. His work included end-to-end validation through Visual Studio builds, in-memory hotpatch loading tests, and CI/CD artifact checks to ensure production readiness. This solution improved compatibility with components like SMBDirect and established a scalable, reliable process for deploying kernel-driver patches in critical environments.
February 2026: Focused on enabling zero-downtime kernel driver updates for MSQuic by delivering runtime hotpatching on both x64 and ARM64. Key work included architecture-specific linker configurations that enable in-memory updates to msquic.sys, improving compatibility with SMBDirect and other components that depend on hotpatch-enabled drivers. Implementations are self-contained, with no user-facing API changes. Validation encompassed end-to-end verification: Visual Studio builds for Release configurations, in-memory hotpatch loading tests, and CI/CD artifact checks to ensure hotpatch metadata remains intact in production artifacts. This work establishes a reliable, scalable path for kernel-driver patches and reduces maintenance windows for critical deployments. Impact: Faster, safer driver updates with reduced downtime; improved production readiness and component compatibility. Technologies/skills demonstrated: Windows kernel-driver hotpatching concepts, architecture-specific linker flags, 6-byte function padding (x64) and PDB injection (ARM64), in-memory patching techniques, CI/CD validation, cross-arch testing, collaboration across teams.
February 2026: Focused on enabling zero-downtime kernel driver updates for MSQuic by delivering runtime hotpatching on both x64 and ARM64. Key work included architecture-specific linker configurations that enable in-memory updates to msquic.sys, improving compatibility with SMBDirect and other components that depend on hotpatch-enabled drivers. Implementations are self-contained, with no user-facing API changes. Validation encompassed end-to-end verification: Visual Studio builds for Release configurations, in-memory hotpatch loading tests, and CI/CD artifact checks to ensure hotpatch metadata remains intact in production artifacts. This work establishes a reliable, scalable path for kernel-driver patches and reduces maintenance windows for critical deployments. Impact: Faster, safer driver updates with reduced downtime; improved production readiness and component compatibility. Technologies/skills demonstrated: Windows kernel-driver hotpatching concepts, architecture-specific linker flags, 6-byte function padding (x64) and PDB injection (ARM64), in-memory patching techniques, CI/CD validation, cross-arch testing, collaboration across teams.

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