test code v1

2026-08-13 10:44:59 +02:00
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+# Test Case: Dot-Omitted OFF_MAX Cookie Rejection
+
+**Test ID**: TC160-dot-omitted-offmax-cookie
+**Category**: Directory Corruption
+**Priority**: Critical
+**Regression**: Synthetic dot at `i_size + 1` overflowed signed directory offsets
+
+## Objective
+
+Verify that a `dot_omitted` directory with `i_size == OFF_MAX` is rejected before
+the synthetic dot entry can create an unrepresentable cookie or negative offset.
+
+## Fixture
+
+`dot-omitted-offmax.erofs` contains an extended directory inode with a valid
+backing block, flat-plain layout, the dot-omitted format bit, and
+`i_size=9223372036854775807`. The structured helper records every mutated field
+and the image hash.
+
+## Procedure
+
+1. Mount the fixture and require `stat` on `/offmax-dir` to report `OFF_MAX`.
+2. Run:
+
+   ```sh
+   truss -o tc160.truss \
+     final_review_probe readdir-offmax /mnt/repo22-final/offmax-dir 97
+   ```
+
+3. The helper first calls `getdirentries` at `OFF_MAX`, then at offset 0. Require
+   `EINTEGRITY` both times and require the descriptor offset to remain exactly
+   `OFF_MAX` and 0 respectively.
+4. Require both syscalls to show `ERR#97`, compare dmesg, and clean all resources.
+
+## Expected Results
+
+- No synthetic dot dirent or cookie is returned.
+- Both reads fail with positive errno 97.
+- No file offset becomes negative or advances after the error.