# DF-3442 -- VERDICT

**REPRODUCED** (impact=none, confidence=certain)
Guest: DragonFly dfbsd 6.5-DEVELOPMENT DragonFly 6.5-DEVELOPMENT #0: Thu Jul  2 06:02:54 UTC 2026  root@dfbsd:/usr/obj/usr/src/sys/X86_64_GENERIC  x86_64

## Summary
iface_match() runs kfnmatch() on rule-supplied via/xmit/recv names the kernel never validates for NUL termination. Stock ipfw3(8) terminates via strlcpy (libipfw3 fill_iface), so exposure needs a hand-crafted root setsockopt; harness (fnmatch == kfnmatch semantics) with a 16-byte all-glob non-terminated name faults the guard page.

## How it was verified
- Method: Verbatim-interposition harness (guard-page technique; no wlan/sppp hardware on this guest)
- Kernel references: sys/net/ipfw3_basic/ip_fw3_basic.c:134-141, sys/net/ipfw3/ip_fw3.h:191-198
- Evidence: non-terminated glob name rc=139; terminated control rc=0; FIXED termination check clean
- Reachability: local-unpriv where noted in the summary; root-config for tun/lagg/carp/ipfw3/gre items; remote-facing for the packet parsers (wlan harnesses model the RX/TX path verbatim because the guest has no 802.11 hardware; precedent DF-0393/DF-0594/DF-0621/DF-0350).
- Privesc assessment: no uid0 chain exists for any finding in this batch -- the memory-safety items are bounded info reads (kernleak bucket) or fault-injection-gated NULL derefs; nothing yields a write primitive or control over privileged state. The one panic-class live item (DF-3414) is root-only (SIOCIFDESTROY).

## Fix
fix_status: fixed -- Harness A/B (fixruns.log): the FIXED build - carrying the natural one-line fix in the same verbatim code - runs clean on the exact input that faults the stock build. Kernel not rebuilt for these Low/hardening items.
fix.diff: natural one-line/class fix authored against the read-only sys/ tree (never applied there).


## Fix status (batch validation)
Applied with the 36 sibling fix.diffs of this batch in findings/poc/_batch41/all_fixes.patch; single in-guest `make -j6 nativekernel KERNCONF=X86_64_GENERIC` completed RC=0 with zero errors under -Werror (full log: findings/poc/_batch41/fix_build8.log). Behavior A/B intentionally skipped for this Info-tier item.