DF-3445 / verdict.json
{ "finding_id": "DF-3445", "status": "reproduced", "reproduced": 1, "poc_path": "findings/poc/DF-3445", "artifact_dir": "findings/poc/DF-3445", "build_cmd": "./build.sh", "run_cmd": "(no arg)", "code_hash": "eb208947c8fd85fe8fc35bc627eadb7edea75aa0b7900c76f0c7cc6f04fe815f", "build_log": "build.log", "run_log": "allruns.log", "impact": "denial_of_service", "confidence": "certain", "verdict": "table_append_dispatch returns without forwarding or replying its netmsg when the M_NOWAIT kmalloc fails (ip_fw3_table.c:168-170), so the dispatcher blocks forever in lwkt_waitmsg on netisr0 and all kernel networking wedges permanently. Logic harness over the verbatim control flow with a failing kmalloc: dispatched=2, forwarded=1 - the second message is stranded.", "exploit_chain": "", "evidence": "misc3.log DF-3445: [fault] dispatched=2 forwarded=1 replied=0 (message stranded)", "kernel_refs": [ "sys/net/ipfw3_basic/ip_fw3_table.c:157-186" ], "poc_changes": "", "attempts": 3, "guest_uname": "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", "runtime_sec": 60, "guest_dirty": 0, "runner": "df-bsd-reviewer", "notes": "", "recommended_fix": "fix.diff", "fix_status": "fixed", "fix_verdict": "The combined-fix kernel replaces the bare return with goto done (netmsg always forwarded); the same 10000-append stress completes with networking fully live on the patched kernel (no wedge), and the harness logic proof (misc3.log) shows the strand deterministically.", "fix_baseline_reproduced": 1, "fix_patched_reproduced": 0, "fix_kernel_uname": "DFBSD 6.5-DEVELOPMENT combined-fix kernel (see fixkernel.log)" } |