# DF-0077 — REPRODUCED (source-only)

## Verdict
REPRODUCED (source-only)

## Mechanism
ntp_sysctl: struct ntptimeval ntv on stack, only named fields set (:215-220). LP64 layout {timespec(16)+long(8)*3+int(4)}=44 bytes padded to 48 (4 trailing bytes unaligned). sysctl_handle_opaque copies sizeof(ntv) → 4 bytes uninit stack leak.

## Source trace
- File: `sys/kern/kern_ntptime.c`
- References: sys/kern/kern_ntptime.c:208, sys/kern/kern_ntptime.c:215, sys/kern/kern_ntptime.c:254

## 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(&ntv, sizeof(ntv)) before populating fields. Matches finding proposal.