# DF-0067 — REPRODUCED (source-only)

## Verdict
REPRODUCED (source-only)

## Mechanism
add_buffer_randomness_src at :665 calls add_buffer_randomness_state(state,buf,bytes,srcid) passing bytes (full remaining) instead of n (256-byte chunk computed :657 and capped :662-663). Comment :638-640 intends large buffers to be split across CPUs; passing bytes feeds the whole buffer to one state per iteration, defeating the split.

## Source trace
- File: `sys/kern/kern_nrandom.c`
- References: sys/kern/kern_nrandom.c:657, sys/kern/kern_nrandom.c:662, sys/kern/kern_nrandom.c:665

## 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
Pass n (the chunk size) instead of bytes. Matches finding proposal.