# DF-0097 — REPRODUCED (source-only)

## Verdict
REPRODUCED (source-only)

## Mechanism
sglist_consume_uio: int len at :389; len=iov->iov_len at :404 truncates size_t→int. iov_len multiple of 2^32 → len=0 silently skipped at :405; iov_len>INT_MAX other → len negative → if(len>resid) signed/unsigned mix → _sglist_append_buf gets a huge size.

## Source trace
- File: `sys/kern/subr_sglist.c`
- References: sys/kern/subr_sglist.c:389, sys/kern/subr_sglist.c:404, sys/kern/subr_sglist.c:410

## 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
Change int len to size_t len so the truncation/mix cannot occur. Matches finding proposal.