test code v1

2026-08-13 10:44:59 +02:00
commit f3b1165f19
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+# Test Case: Superblock CRC Field Mismatch
+
+**Test ID**: TC016-superblock-crc-invalid
+**Category**: Error Handling
+**Priority**: High
+
+## Objective
+
+Verify that changing only the stored superblock checksum field causes
+`EINTEGRITY`, with all protected bytes and provider length unchanged.
+
+## Fixture Qualification
+
+```sh
+work=$(mktemp -d /tmp/repo22-tc016.XXXXXX)
+tests/prepare_error_fixtures.sh "$work/fixtures"
+grep '^bad-checksum-field ' "$work/fixtures/fixture-evidence.txt"
+python3 tests/erofs_fixture.py inspect \
+  "$work/fixtures/bad-checksum-field.erofs"
+wc -c "$work/fixtures/valid-plain.erofs" \
+  "$work/fixtures/bad-checksum-field.erofs"
+sha256 -q "$work/fixtures/bad-checksum-field.erofs"
+```
+
+The mutator flips bit 0 of the little-endian checksum at absolute byte 1028,
+does not recompute it, asserts checksum invalidity, and changes no other byte.
+
+## FreeBSD Procedure
+
+```sh
+mkdir "$work/mnt"
+unit=$(mdconfig -a -t vnode -f "$work/fixtures/bad-checksum-field.erofs")
+set +e
+mount -t erofs -o ro "/dev/$unit" "$work/mnt" \
+  >"$work/mount.out" 2>"$work/mount.err"
+status=$?
+set -e
+test "$status" -ne 0
+set +e
+truss -o "$work/mount.truss" mount -t erofs -o ro "/dev/$unit" \
+  "$work/mnt" >/dev/null 2>&1
+set -e
+grep -E 'nmount.*ERR#97' "$work/mount.truss"
+! mount -p | awk -v path="$work/mnt" '$2 == path { found=1 }
+  END { exit found ? 0 : 1 }'
+mdconfig -d -u "${unit#md}"
+```
+
+## Expected Results
+
+Mount returns errno 97 (`EINTEGRITY`) with a checksum diagnostic. No mount or
+md consumer remains.