{
 "finding_id": "DF-3159",
 "verdict": "reproduced",
 "impact": "corruption",
 "confidence": "certain",
 "reproduce": {
  "build": "host: python3 craft_fat32big.py head; guest: truncate -s 4831838208 img + dd head at 0; cc trunc.c / trunc_step.c",
  "run": "guest: vnconfig -c -S 4608m, mount_msdos, paced growth then final ftruncate 0x100010000, umount, remount, stat",
  "expected": "ftruncate succeeds; file shrinks to 65536 after remount (0x10000 = low 32 bits)"
 },
 "kernel_refs": [
  "sys/vfs/msdosfs/msdosfs_vnops.c:371-399",
  "sys/vfs/msdosfs/msdosfs_denode.c:509-511",
  "sys/vfs/msdosfs/msdosfs_denode.c:636",
  "sys/vfs/msdosfs/msdosfs_vnops.c:618"
 ],
 "artifacts": [
  "craft_fat32big.py",
  "trunc.c",
  "trunc_step.c",
  "run_guest.sh",
  "run.log",
  "README.md",
  "VERDICT.md",
  "build.sh",
  "run.sh",
  "manifest.json",
  "verdict.json",
  "fix.diff",
  "env.txt",
  "compile_validation.txt"
 ]
}