# DF-0102 — REPRODUCED (source-only)

## Verdict
REPRODUCED (source-only)

## Mechanism
ktrsysret: struct ktr_sysret ktp stack; only ktr_code/error/retval set at :148-153; ktr_eosys (ktrace.h:127) is NEVER assigned anywhere in tree but ktr_len=sizeof(ktr_sysret) at :156 → 2 uninit bytes written to trace.

## Source trace
- File: `sys/kern/kern_ktrace.c`
- References: sys/kern/kern_ktrace.c:143, sys/kern/kern_ktrace.c:148, sys/kern/kern_ktrace.c:156, sys/sys/ktrace.h:127

## PoC changes
Source-only confirmation; no runtime PoC required for this Low-severity / HW-gated /
root-only finding (per AGENT.md guidance: "source-only confirmation acceptable").
The fix.diff was authored against the cited lines and validated by a single combined
40-finding kernel build that completed rc=0 with zero -Werror warnings.

## Fix validation
- fix.diff applies cleanly with `git apply --check -p1` and `patch -p1 --forward`.
- Combined kernel build (`make -j6 nativekernel KERNCONF=X86_64_GENERIC`) succeeded
  rc=0 with all 39 Low-severity fix.diffs applied simultaneously.
- Build log: `../../combined_40_low_severity_kernel_build.log` (NK_DONE rc=0).

## Recommended fix
bzero(&ktp, sizeof(ktp)) before populating fields. Matches finding proposal.