test code v1

2026-08-13 10:44:59 +02:00
commit f3b1165f19
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+# Test Case: Corrupted Superblock Fields
+
+**Test ID**: TC015-superblock-corrupted
+**Category**: Error Handling
+**Priority**: High
+
+## Objective
+
+Verify ordered rejection of an unsupported block size, an image-bounds-invalid
+48-bit root NID, and an unknown incompat feature. Every variant preserves
+provider length and carries a checksum valid for its encoded fields.
+
+## Fixture Qualification
+
+```sh
+work=$(mktemp -d /tmp/repo22-tc015.XXXXXX)
+tests/prepare_error_fixtures.sh "$work/fixtures"
+grep -E '^(bad-block-size|bad-root-nid|unsupported-feature) ' \
+  "$work/fixtures/fixture-evidence.txt"
+python3 tests/erofs_fixture.py inspect "$work/fixtures/bad-block-size.erofs"
+python3 tests/erofs_fixture.py inspect "$work/fixtures/bad-root-nid.erofs"
+python3 tests/erofs_fixture.py inspect "$work/fixtures/unsupported-feature.erofs"
+(cd "$work/fixtures" && sha256 -c SHA256SUMS)
+```
+
+`bad-block-size` changes `blkszbits` at 1036 from 12 to 13 and recomputes the
+checksum over `[1024,8192)`. `bad-root-nid` selects the 48-bit union form and
+sets `rootnid_8b` beyond the declared inode area. `unsupported-feature` sets
+unknown incompat bit `0x80000000`.
+
+## FreeBSD Procedure
+
+For each image, attach a dynamic vnode md unit, run mount directly and under
+`truss`, assert nonzero status and no mount entry, then detach that exact unit.
+
+```sh
+mkdir "$work/mnt"
+for image in bad-block-size.erofs bad-root-nid.erofs unsupported-feature.erofs
+do
+  unit=$(mdconfig -a -t vnode -f "$work/fixtures/$image")
+  set +e
+  mount -t erofs -o ro "/dev/$unit" "$work/mnt" \
+    >"$work/$image.out" 2>"$work/$image.err"
+  status=$?
+  set -e
+  printf '%s status=%s\n' "$image" "$status"
+  test "$status" -ne 0
+  set +e
+  truss -o "$work/$image.truss" mount -t erofs -o ro "/dev/$unit" \
+    "$work/mnt" >/dev/null 2>&1
+  set -e
+  grep -E 'nmount.*ERR#' "$work/$image.truss"
+  ! mount -p | awk -v path="$work/mnt" '$2 == path { found=1 }
+    END { exit found ? 0 : 1 }'
+  mdconfig -d -u "${unit#md}"
+done
+```
+
+## Expected Results
+
+Bad block size returns `EINVAL`, bad root NID returns `EINTEGRITY`, and the
+unknown incompat bit returns `EOPNOTSUPP`. Record syscall errno, image hash,
+provider length, new dmesg lines, and cleanup for all three subcases.