DF-2982 / verdict.json
{ "finding_id": "DF-2982", "status": "not_reproduced", "reproduced": 0, "impact": "none", "confidence": "certain", "verdict": "Comment-only finding: nothing executable to reproduce. Line-confirmed that the header comment (default_pager.c:37-38) still claims vm_page carries a ->swapblk field and that OBJT_DEFAULT objects convert only when pages are physically freed, and the haspage comment still says it calls swap_pager_haspage() while the code returns FALSE unconditionally (default_pager.c:139-141). The swblock_count==0 invariant is load-bearing for default_pager_dealloc KKASSERT (:97), vm_fault zero-fill-on-FAIL (vm_fault.c:2290-2329) and the DRM shims (linux_shmem.c:66, ttm_tt.c:372). Comment rewrite applied and compiled as part of the F40FIX build.", "exploit_chain": "", "evidence": "VERDICT.md with path:line citations; run.log where a live demo exists; fix.diff", "kernel_refs": [ "sys/vm/default_pager.c:37", "sys/vm/default_pager.c:97", "sys/vm/default_pager.c:139" ], "poc_changes": "n/a - comment-only", "attempts": 0, "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": 30, "guest_dirty": 0, "build_cmd": "see build.sh", "run_cmd": "see run.sh", "code_hash": null, "notes": "", "recommended_fix": "rewrite the retired-design comments; document the swblock_count==0 invariant", "fix_status": "compile_validated", "fix_verdict": "fix.diff applied in the F40FIX verification kernel build (RC=0, zero -Werror errors); no runtime A/B for this item (line-certain hardening)" } |