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Nicolas Iooss

PROFILE

Nicolas Iooss

Worked extensively on the NationalSecurityAgency/ghidra repository, delivering enhancements and fixes to eBPF disassembly and analysis. Improved the processor’s handling of CALL target address calculation, added support for indirect CALLX and ISA v4, and introduced big-endian eBPF compatibility through updated language definitions and configuration. Addressed correctness in atomic instruction decoding and byte swap semantics, aligning with kernel and RFC specifications. Leveraged C, Python, and Lean for low-level programming, static type checking, and formal verification. Also contributed to cryspen/hax by stabilizing Lean proof compatibility, reducing CI failures and upgrade friction. Demonstrated depth in reverse engineering and disassembler development.

Overall Statistics

Feature vs Bugs

43%Features

Repository Contributions

10Total
Bugs
4
Commits
10
Features
3
Lines of code
296
Activity Months5

Work History

April 2026

1 Commits

Apr 1, 2026

April 2026 monthly summary for cryspen/hax: Stabilized Lean 4.29 compatibility for RustM.toBVRustM_bind by replacing a fragile simplification tactic with rfl, ensuring the proof remains valid across Lean versions (4.28–4.29). This targeted fix reduces upgrade friction, lowers CI failures, and strengthens the library's reliability for downstream projects.

December 2025

3 Commits • 1 Features

Dec 1, 2025

December 2025, NationalSecurityAgency/ghidra: Delivered targeted fixes to improve eBPF analysis accuracy and strengthened PyGhidra typing for context managers. The changes reduce false positives in eBPF disassembly, align behavior with kernel specifications, and enhance static analysis clarity, driving faster, more reliable reverse-engineering workflows and safer code maintenance.

May 2025

1 Commits • 1 Features

May 1, 2025

May 2025 monthly summary for NationalSecurityAgency/ghidra: Delivered big-endian eBPF support in the Ghidra processor, enabling analysis of big-endian eBPF binaries by introducing language definitions and updated processor configurations. No major bugs fixed this month; focus was on delivering a stable, extensible extension to the processor. Overall impact: broadened analysis coverage, improved capability to analyze eBPF artifacts, and faster triage of binaries. Technologies/skills demonstrated: eBPF, Ghidra processor module, language definitions, config management, and Git-based collaboration with clear commit history.

April 2025

4 Commits • 1 Features

Apr 1, 2025

April 2025 (Month: 2025-04) focused on ghidra's eBPF analysis capabilities. Delivered two core areas: (1) eBPF disassembly enhancements including indirect CALLX support and ISA v4 coverage, enabling accurate analysis of modern eBPF binaries; (2) correctness fixes for eBPF loads and byte swap semantics to align with RFC 9669 and host architecture behavior. These changes improve static analysis accuracy, reduce misinterpretations of eBPF code, and expand ghidra's applicability to security workflows across modern binaries.

March 2025

1 Commits

Mar 1, 2025

March 2025: Delivered a critical bug fix to eBPF CALL target address calculation in the Ghidra processor, correcting the multiplication of the CALL immediate by 8 in the disp32 operand and ELF Relocation handling. This change improves the accuracy of eBPF disassembly and reduces risk of mis-identified control-flow targets in static analysis, aligned with the commit c1d96a214049944549c6429f994907f19de72acb.

Activity

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Quality Metrics

Correctness100.0%
Maintainability94.0%
Architecture94.0%
Performance92.0%
AI Usage20.0%

Skills & Technologies

Programming Languages

CC++Ghidra Scripting LanguageJavaLeanPythonSINCSLASincXML

Technical Skills

Compiler DevelopmentDisassemblerDisassembler DevelopmentEmbedded SystemsLeanLow-Level ProgrammingPythonReverse EngineeringStatic Type CheckingType Annotationscompiler designdisassembler developmenteBPFformal verificationkernel development

Repositories Contributed To

2 repos

Overview of all repositories you've contributed to across your timeline

NationalSecurityAgency/ghidra

Mar 2025 Dec 2025
4 Months active

Languages Used

JavaSincGhidra Scripting LanguageSINCSLAXMLCC++

Technical Skills

DisassemblerReverse EngineeringeBPFCompiler DevelopmentDisassembler DevelopmentEmbedded Systems

cryspen/hax

Apr 2026 Apr 2026
1 Month active

Languages Used

Lean

Technical Skills

Leanformal verificationproof development