@@ -1,8 +1,9 @@
# Red Team Journal — ExGitObjectstore
**Issue**: [#5](https://github.com/notifd/ex_git_objectstore/issues/5)
**Fix Issue**: [#6](https://github.com/notifd/ex_git_objectstore/issues/6)
**Date**: 2026-02-10
**Status**: Complete
**Status**: Fix cycles complete — all Critical/High addressed
**Team**: security-hunter, perf-hunter, correctness-auditor, interop-tester, reliability-auditor
## Executive Summary
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| M3 | Medium | Reliability | reliability-auditor | — |
| M4 | Medium | Security | security-hunter | — |
| M5 | Medium | Correctness | correctness-auditor | — |
---
## Fix Cycle 1 (Commit `53e711a`)
**All 10 Critical and 10 High findings addressed.** 407 tests, 0 failures.
| Finding | Fix Summary | Tests |
|---------|-------------|-------|
| C1 | `Reader.parse()` now calls `resolve_delta_entries` to resolve deltas before returning | bugfix_c1_c2_h10_test.exs |
| C2 | `fold_continuation_lines` strips leading space with `String.slice(line, 1..-1//1)` | bugfix_c1_c2_h10_test.exs |
| C3 | Pack reader `decompress_data` uses `safeInflate` streaming with 128MB limit | reader_decompression_test.exs |
| C4 | `Object.safe_decompress` uses `safeInflate` streaming with early abort | safe_decompress_test.exs |
| C5 | `ObjectResolver` downloads index first, only downloads pack if SHA found | (integration) |
| C6 | Header continuation byte limit (10 bytes max) | reader_decompression_test.exs |
| C7 | Architectural (streaming pack reader is a future improvement) | — |
| C8 | SHA cache built from parsed index, passed to `Reader.read_object` | (integration) |
| C9 | `list_refs` uses `Enum.flat_map` with case expression, skips deleted refs | (integration) |
| C10 | Stale lock detection with 5-minute threshold via `maybe_break_stale_lock` | (integration) |
| H1 | `list_packs` filters out orphaned .pack files without matching .idx | (integration) |
| H2 | Added CAS limitation docs to S3 module, `safe_key` on HEAD operations | — |
| H3 | Depth-limited ref resolution (max 10 levels), returns `{:error, :symbolic_ref_loop}` | (integration) |
| H4 | Priority-queue LCA algorithm for `merge_base` | (unit) |
| H5 | Integer counter instead of O(N) `length()` check in walk | (unit) |
| H6 | Diff handles trailing newline correctly | h6_h9_fixes_test.exs |
| H7 | Repo ID validated with regex, rejects `..`, max 255 bytes | h6_h9_fixes_test.exs |
| H8 | `list_files_recursive` uses `File.lstat` to skip symlinks | (integration) |
| H9 | Pack writer: changed `entries_acc ++ [entry]` to `[entry | entries_acc]` | h6_h9_fixes_test.exs |
| H10 | `build_commit`/`build_tag` validate required keys before `struct!` | bugfix_c1_c2_h10_test.exs |
---
## Red Team Cycle 2
**Auditors**: auditor-security-perf, auditor-correctness-reliability
### New findings from cycle 2:
| ID | Severity | Finding | Disposition |
|----|----------|---------|-------------|
| NEW-C1 | Critical | `try_decompress_prefix` uses unsafe `:zlib.inflate`, bypassing C3/C4 safeInflate fix | **Fixed in cycle 2** |
| NEW-H1 | High | upload_pack `objs ++ acc` claimed O(N²) | **False positive** — `left ++ right` is O(|left|); total across all calls is O(N) |
| NEW-H2 | High | S3 `s3_list_all` claimed O(N²) | **False positive** — same reasoning; `Enum.reverse(page) ++ acc` is O(page_size) per page |
| NEW-H3 | High | `build_sha_index` uncached in `Reader.parse()` delta resolution path | **Fixed in cycle 2** |
| NEW-H4 | High | `encode_raw_from_type` accepts any atom without validation | **Fixed in cycle 2** |
| NEW-H5 | Medium | Stale lock TOCTOU race (acceptable) | **Accepted risk** — the race window is negligible and this is defense in depth |
---
## Fix Cycle 2 (this commit)
**3 real fixes, 2 false positives dismissed.** 433 tests, 0 failures.
| Finding | Fix Summary | Tests |
|---------|-------------|-------|
| NEW-C1 | `try_decompress_prefix` now uses `safeInflate` + `inflateEnd` for stream completion verification. On OTP 27, `safeInflate` returns `{:finished, _}` even for incomplete streams, so `inflateEnd` (which verifies the Adler32 checksum) is essential for correctness. | cycle2_fixes_test.exs (6 tests) |
| NEW-H3 | `parse_entries` now builds SHA-to-offset cache incrementally as it parses non-delta objects. Cache passed to `resolve_delta_entries` → `read_object`, eliminating redundant `build_sha_index` calls. | cycle2_fixes_test.exs (4 tests) |
| NEW-H4 | `encode_raw_from_type/2` guard changed from `is_atom(type)` to `type in [:blob, :commit, :tree, :tag]`. Invalid types now raise `FunctionClauseError`. | cycle2_fixes_test.exs (17 tests) |