erofs-freebsd-out-tree/tests/TC013-vget-invalid.md

Test Case: Vget with Invalid NID

Test ID: TC013-vget-invalid

Objective

Verify a checksum-valid directory entry that points outside the image reaches the cold lookup/vget path and fails consistently with EINTEGRITY.

Fixture

Use images/invalid-dirent-nid.erofs. fixture-evidence.txt records the exact dirent offset, old NID, out-of-range NID, and valid recomputed CRC. Compile tests/read_probe.c in the guest.

Procedure

Mount the image without first listing the root, then run:

./read_probe expect-error "$mnt/invalid-target.txt" 97
./read_probe expect-error "$mnt/invalid-target.txt" 97
set +e
truss -o /tmp/tc013.truss stat "$mnt/invalid-target.txt"
rc=$?
set -e
printf 'stat_rc=%d\n' "$rc"
tail -20 /tmp/tc013.truss

Record dmesg before/after, remove the trace, then unmount and detach.

Expected Results

• Mount succeeds because only the child dirent is malformed.
• Both cold/repeated opens fail at pathname acquisition with FreeBSD errno 97 (EINTEGRITY); truss shows the same syscall errno.
• The second failure is not converted to ENOENT; no panic or stale vnode appears, and cleanup succeeds.