# DF-0041 — REPRODUCED (source-only, root-only kldload)

## Verdict
REPRODUCED (source-only, root-only kldload)

## Mechanism
Every name-from-strtab site does strtab + offset with NO check offset < ddbstrcnt/shstrcnt. Tables kmalloc exactly sh_size with no trailing NUL → crafted out-of-range st_name/sh_name walks off the allocation via strcmp.

## Source trace
- File: `sys/kern/link_elf_obj.c`
- References: sys/kern/link_elf_obj.c:304, sys/kern/link_elf_obj.c:591, sys/kern/link_elf_obj.c:607

## 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
Allocate sh_size+1 bytes for both string tables and NUL-terminate the trailing byte so strcmp can't walk off the allocation. Matches finding proposal.