CTSRD-CHERI/cheribsd
Nov 2024 – Mar 2025
4 Months active
Languages Used
CAssembly
Technical Skills
Build SystemsSystem ProgrammingCompiler ToolchainsVersion ControlEmbedded systemsLow-level programming
Konrad Witaszczyk
PROFILE
Konrad Witaszczyk
Over six months, contributed to CTSRD-CHERI/cheribsd and cheribuild by enhancing build system reliability and kernel configuration workflows. Addressed build reproducibility and automation by standardizing kernel configuration retrieval and enabling command-line customization for CheriBSD releases. Improved system stability through targeted bug fixes, such as refining page table permission handling for ARM64 and resolving build issues related to pure-capability ABI and LLVM 15 compatibility. Leveraged skills in build systems, cross-compilation, and low-level programming using C, Python, and Assembly. Ensured hybrid architecture support in QEMU builds, directly improving CI reliability and developer productivity across embedded and system programming environments.
Overall Statistics
Feature vs Bugs
17%Features
Repository Contributions
6Total
Bugs
5
Commits
6
Features
1
Lines of code
13
Activity Months6
Your Network
58 peopleShared Repositories
42
Work History
October 2025
1 Commits
Oct 1, 2025Month 2025-10 focused on stabilizing and enabling build/test workflows for CheriBSD/Morello in cheribuild. Delivered QEMU native build compatibility for hybrid architecture by default, addressing persistent build failures when targeting purecap. This directly improves developer productivity and CI reliability for hybrid-arch workflows.
1 Commits
Oct 1, 2025Month 2025-10 focused on stabilizing and enabling build/test workflows for CheriBSD/Morello in cheribuild. Delivered QEMU native build compatibility for hybrid architecture by default, addressing persistent build failures when targeting purecap. This directly improves developer productivity and CI reliability for hybrid-arch workflows.
October 2025
June 2025
1 Commits • 1 Features
Jun 1, 2025June 2025: CTSRD-CHERI/cheribuild delivered Release Build Kernel Configuration Standardization, enabling more reproducible CheriBSD release builds and customizable kernel configurations via CLI. This work reduces manual steps, improves automation, and strengthens build reproducibility across targets. Notable commit contributes to this improvement: 5642d1897be9e8524a984263e7709d1cf0c8be53.
June 2025
1 Commits • 1 Features
Jun 1, 2025June 2025: CTSRD-CHERI/cheribuild delivered Release Build Kernel Configuration Standardization, enabling more reproducible CheriBSD release builds and customizable kernel configurations via CLI. This work reduces manual steps, improves automation, and strengthens build reproducibility across targets. Notable commit contributes to this improvement: 5642d1897be9e8524a984263e7709d1cf0c8be53.
March 2025
1 Commits
Mar 1, 2025March 2025 monthly summary for CTSRD-CHERI/cheribsd: Delivered a critical ARM64 kernel memory-permission fix that improves page table handling and overall memory safety. The change introduces a kernel page table permission macro and replaces a direct symbol reference with the macro to ensure the correct bitmask for clearing permissions, strengthening memory access control in the kernel and reducing risk of misconfigurations on ARM64 platforms.
1 Commits
Mar 1, 2025March 2025 monthly summary for CTSRD-CHERI/cheribsd: Delivered a critical ARM64 kernel memory-permission fix that improves page table handling and overall memory safety. The change introduces a kernel page table permission macro and replaces a direct symbol reference with the macro to ensure the correct bitmask for clearing permissions, strengthening memory access control in the kernel and reducing risk of misconfigurations on ARM64 platforms.
March 2025
January 2025
1 Commits
Jan 1, 2025January 2025: Build system compatibility with LLVM 15 for CTSRD-CHERI/cheribsd. Updated the __CheriBSD_version macro to 20250127 to trigger rebuilds for packages dependent on devel/llvm-morello (LLVM 15), ensuring compatibility with the new LLVM version. Implemented in commit 3d2e71c51dfe3fd527c5e5957dd0bef2705dd0fe (Bump __CheriBSD_version to 20250127).
January 2025
1 Commits
Jan 1, 2025January 2025: Build system compatibility with LLVM 15 for CTSRD-CHERI/cheribsd. Updated the __CheriBSD_version macro to 20250127 to trigger rebuilds for packages dependent on devel/llvm-morello (LLVM 15), ensuring compatibility with the new LLVM version. Implemented in commit 3d2e71c51dfe3fd527c5e5957dd0bef2705dd0fe (Bump __CheriBSD_version to 20250127).
December 2024
1 Commits
Dec 1, 2024December 2024 focused on stabilizing builds for the pure-capability (purecap) ABI in CTSRD-CHERI/cheribsd. A targeted bug fix was implemented to prevent redefining __SSP_FORTIFY_LEVEL in ssp.h when building for purecap, avoiding unintended use of *_chk() variants for libc functions that are not compiled in this environment.
1 Commits
Dec 1, 2024December 2024 focused on stabilizing builds for the pure-capability (purecap) ABI in CTSRD-CHERI/cheribsd. A targeted bug fix was implemented to prevent redefining __SSP_FORTIFY_LEVEL in ssp.h when building for purecap, avoiding unintended use of *_chk() variants for libc functions that are not compiled in this environment.
December 2024
November 2024
1 Commits
Nov 1, 2024Month 2024-11: Build-system stabilization for development workflow. Triggered development-package rebuilds by bumping the __CheriBSD_version macro from 20240617 to 20241108, ensuring developers test against current changes without affecting the stable CheriBSD 24.05 release.
November 2024
1 Commits
Nov 1, 2024Month 2024-11: Build-system stabilization for development workflow. Triggered development-package rebuilds by bumping the __CheriBSD_version macro from 20240617 to 20241108, ensuring developers test against current changes without affecting the stable CheriBSD 24.05 release.
Activity
Loading activity data...
Quality Metrics
Correctness93.4%
Maintainability90.0%
Architecture90.0%
Performance80.0%
AI Usage20.0%
Skills & Technologies
Programming Languages
AssemblyCPython
Technical Skills
Build System ConfigurationBuild SystemsCompiler ToolchainsCross-CompilationEmbedded systemsLow-level programmingSystem AdministrationSystem ProgrammingSystem programmingVersion Control
Repositories Contributed To
Overview of all repositories you've contributed to across your timeline
CTSRD-CHERI/cheribuild
Jun 2025 – Oct 2025
2 Months active
Languages Used
Python
Technical Skills
Build SystemsCross-CompilationSystem AdministrationBuild System Configuration