# DF-0120 — REPRODUCED (source-only, defense-in-depth)

## Verdict
REPRODUCED (source-only, defense-in-depth)

## Mechanism
KENV_GET (:135-149) and sysctl_kenv_boot (:472-501) expose all boot loader env vars to any local user. No caps_priv_check on read paths. Secrets in loader.conf (passwords, keys) disclosed.

## Source trace
- File: `sys/kern/kern_environment.c`
- References: sys/kern/kern_environment.c:135, sys/kern/kern_environment.c:472

## 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
Add caps_priv_check_self(SYSCAP_NOKENV_WR) on KENV_GET and at the top of sysctl_kenv_boot. Matches finding proposal.