# DF-3275 -- VERDICT

**NOT REPRODUCED** (impact=none, confidence=likely)
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
The PAP/CHAP compares are verbatim early-exit bcmp (4330-4336 / 4069-4071) - the code property is certain - but the timing oracle could NOT be measured on this shared-KVM guest: rejection time for a 16-byte compare is ~1 cycle regardless of prefix (memcmp differences below scheduler/clock noise). No remote timing channel demonstrated; treat as hardening.

## How it was verified
- Method: Code-line analysis + attempted live reproduction
- Kernel references: sys/net/sppp/if_spppsubr.c:4330-4336, sys/net/sppp/if_spppsubr.c:4069-4071
- Evidence: misc3.log DF-3275 (df3275 timing table: ~0.9-1.4 cycles/reject, non-monotone)
- 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: not_testable -- Fix = constant-time compare (loop all bytes, accumulate XOR) at both sites; not A/B-able here since no oracle was measurable.



## 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.

(No fix.diff for this item: documented recommendation only - see Fix above.)