aeondave/renode
offensive-tools/rev/renode/SKILL.md
Auth/lab ref: Renode board and SoC simulation for MCU/RTOS firmware, UART/GPIO/peripheral modeling, GDB remote debugging, REPL platforms, and RESC scripts.
$ install --global
skillsauthnpx skillsauth add aeondave/malskill renodeInstall this skill globally with one command. Works with Claude Code, Cursor, and Windsurf.
Security Scan Results
3 of 9 scanners reported clean
Some scanners were skipped, did not run, or reported a non-clean status. Review each row below.
3
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9
Scanners in report
Clean
TrivyContainer and dependency vulnerability scanner
95%
Clean
SemgrepStatic code analysis for vulnerabilities
95%
Clean
mcp-scan (Snyk)Model Context Protocol security validation
95%
Skipped
Snyk (dep)Open source security scanning
50%
Skipped
Socket.devSupply chain security analysis
50%
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VirusTotalMulti-engine malware detection
50%
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CrowdStrikeAdvanced threat intelligence
50%
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OSV-ScannerOpen Source Vulnerability database check
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OWASP Dep-Check
50%
Last scanned: Jul 24, 2026, 3:58 AM37.5s1 file scanned
SKILL.md
- name:
- renode
- description:
- Auth/lab ref: Renode board and SoC simulation for MCU/RTOS firmware, UART/GPIO/peripheral modeling, GDB remote debugging, REPL platforms, and RESC scripts.
- license:
- MIT
- compatibility:
- Renode on Linux/macOS/Windows; target support depends on available platform descriptions and modeled peripherals.
- version:
- 1.0
- category:
- tool
Renode
Renode is the first public tool to try when firmware behavior depends on a modeled MCU board, RTOS peripherals, UART, GPIO, timers, storage, or multi-core SoC state.
Use Renode when
- the artifact is MCU/RTOS firmware and a board or close SoC model exists
- UART/GPIO/timer/storage/network peripheral behavior matters
- QEMU lacks the exact board, or CPU-only emulation hangs on MMIO
- you need deterministic virtual time and GDB remote debugging
- you can write or adapt a
.replplatform description for the minimum needed peripherals
Do not treat CPU stepping as board parity. Prove the peripheral behavior relevant to the objective.
Core objects
.repl: platform description; CPUs, memory maps, buses, UARTs, GPIOs, timers, and peripherals..resc: Renode monitor script; creates machines, loads platforms, loads binaries, configures analyzers, starts emulation.- Monitor: interactive command surface for machines, sysbus, peripherals, memory, UART analyzers, and GDB server.
- Robot Framework: useful for validation harnesses that assert UART/peripheral output; keep it as test infrastructure, not the only evidence.
Minimal monitor flow
mach create
machine LoadPlatformDescription @platforms/boards/<board>.repl
sysbus LoadELF @firmware.elf
showAnalyzer sysbus.uart0
machine StartGdbServer 3333
start
Useful commands:
peripherals
sysbus WhatPeripheralIsAt 0x40000000
sysbus ReadDoubleWord 0x40000000
sysbus WriteDoubleWord 0x40000000 0x1
sysbus.cpu Step
pause
quit
For raw binaries, set load address and reset vector deliberately; ELF is safer when available because it carries sections and entry point.
Custom platform guidance
When no board exists:
- Build the smallest
.replfrom known CPU, RAM/flash, and MMIO ranges. - Add UART first if console output is needed.
- Add timers/interrupt controller before assuming RTOS scheduler failure.
- Stub unknown peripherals only enough to pass non-target checks.
- Label the result as partial parity and list unmodeled peripherals.
Sources for modeling clues: vendor datasheet, SVD, linker script, map file, DTB, SDK headers, strings, disassembly xrefs to MMIO addresses, and logic/UART captures.
GDB
machine StartGdbServer 3333
Then connect with the matching toolchain:
arm-none-eabi-gdb firmware.elf
(gdb) target remote :3333
Use GDB to prove reset handler, RTOS task creation, peripheral driver paths, memory state, and breakpoints on fault handlers.
Evidence
- exact
.repl/.rescor monitor command sequence - board/profile source and any custom modeled/stubbed devices
- UART transcript, GPIO/peripheral read/write, memory state, or GDB breakpoint
- whether proof is instruction execution, runtime boot, peripheral parity, or system parity
Failure pivots
- no UART: wrong UART instance, firmware uses semihosting/RTT, clocks not modeled, or boot never reaches init
- stuck in default handler: missing IRQ/timer/peripheral model
- fault after reset: wrong load address, vector table, stack pointer, Thumb bit, or memory map
- GDB oddities on multicore boards: start/select the correct CPU-specific GDB server
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