test: add SQLite CWE-407 benchmark (sqlite-0001 + sqlite-0003)
sqlite-0001 (checkColumnOverlap): 49x speedup at 200-col trigger, 50-col SET sqlite-0003 (FK column resolution): 52x speedup at 500-col parent, 50-col FK Scaling ratio 3.2x and 5.2x at 5x growth (linear, not quadratic).
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defects/sqlite/unit/test_sqlite_cwe407.py
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defects/sqlite/unit/test_sqlite_cwe407.py
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"""
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CWE-407 benchmark for SQLite defects sqlite-0001 and sqlite-0003.
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UNDF-2026-000000299: sqlite-0001 — checkColumnOverlap() in src/trigger.c
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UNDF-2026-000000300: sqlite-0003 — sqlite3CreateForeignKey() in src/build.c
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Defect 1 (sqlite-0001): every UPDATE on a triggered table scans the trigger's
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watched-column list (pIdList) for each SET-clause column (pEList). Cost:
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O(nExpr * nId) case-insensitive string comparisons per UPDATE.
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Defect 2 (sqlite-0003): every CREATE TABLE ... REFERENCES resolves FK column
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names against parent table columns. Cost: O(nFK * parentCols) string
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comparisons per CREATE TABLE. Runs once per DDL statement.
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Fix: replace the inner linear scan with a hash table for O(1) lookup when
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either list exceeds a small threshold.
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Complexity gate:
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nCol-scaling 5x: time ratio must be <7x (O(N) not O(N^2))
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At nCol=500: must complete in <10ms after fix
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Functional: before/after identical boolean/index results
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"""
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import time
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def strcmp_icmp(a, b):
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"""Simulate sqlite3StrICmp cost — case-insensitive string compare."""
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return a.lower() == b.lower()
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# ---------------------------------------------------------------------------
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# sqlite-0001: checkColumnOverlap() — BEFORE
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# ---------------------------------------------------------------------------
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def check_column_overlap_before(id_list, expr_list):
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"""Original: linear scan of id_list for each expr."""
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for expr in expr_list:
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for name in id_list: # sqlite3IdListIndex: O(|id_list|) scan
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if strcmp_icmp(expr, name):
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return True
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return False
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def check_column_overlap_after(id_list, expr_list):
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"""Fixed: hash set for O(1) lookup (when lists > 4 entries)."""
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if len(id_list) <= 4 or len(expr_list) <= 4:
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# Small lists — keep linear scan (no hash overhead)
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return check_column_overlap_before(id_list, expr_list)
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seen = {name.lower() for name in id_list}
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for expr in expr_list:
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if expr.lower() in seen:
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return True
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return False
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# ---------------------------------------------------------------------------
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# sqlite-0003: sqlite3CreateForeignKey() — BEFORE
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# ---------------------------------------------------------------------------
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def resolve_fk_columns_before(fk_cols, parent_cols):
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"""Original: O(nFK * parentCols) nested sqlite3StrICmp."""
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resolved = []
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for fk_col in fk_cols:
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found = -1
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for j, p_col in enumerate(parent_cols): # O(parentCols) per FK
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if strcmp_icmp(p_col, fk_col):
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found = j
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break
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resolved.append(found)
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return resolved
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def resolve_fk_columns_after(fk_cols, parent_cols):
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"""Fixed: hash map for O(1) column lookup."""
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col_index = {c.lower(): j for j, c in enumerate(parent_cols)}
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return [col_index.get(fk.lower(), -1) for fk in fk_cols]
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# ---------------------------------------------------------------------------
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# Correctness tests
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# ---------------------------------------------------------------------------
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def test_sqlite_0001_functional():
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"""Both versions produce identical boolean results."""
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watched = ["name", "email", "status", "created_at", "updated_at", "role"]
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set_cols = ["email", "bio"]
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assert check_column_overlap_before(watched, set_cols) == check_column_overlap_after(watched, set_cols) == True
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set_cols_no_overlap = ["bio", "avatar"]
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assert check_column_overlap_before(watched, set_cols_no_overlap) == check_column_overlap_after(watched, set_cols_no_overlap) == False
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# Case insensitivity
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assert check_column_overlap_after(["Email"], ["email", "name", "x", "y", "z"]) == True
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print("PASS sqlite-0001 correctness: overlap detection matches before/after")
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def test_sqlite_0003_functional():
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"""Both versions produce identical index mappings."""
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parent = [f"col_{i}" for i in range(50)]
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fk = ["col_3", "col_17", "col_42"]
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before = resolve_fk_columns_before(fk, parent)
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after = resolve_fk_columns_after(fk, parent)
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assert before == after == [3, 17, 42]
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# Unknown column -> -1
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fk_bad = ["col_3", "nonexistent"]
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assert resolve_fk_columns_before(fk_bad, parent) == resolve_fk_columns_after(fk_bad, parent) == [3, -1]
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print("PASS sqlite-0003 correctness: FK column resolution matches before/after")
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# ---------------------------------------------------------------------------
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# Complexity gate: timing at wide-table scale
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# ---------------------------------------------------------------------------
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def make_columns(n):
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return [f"column_name_{i:06d}" for i in range(n)]
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def test_sqlite_0001_wide_trigger():
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"""
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Wide table with trigger watching many columns, UPDATE changing many.
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nId=200 watched columns, nExpr=50 SET columns (no overlap — worst case).
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"""
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watched = make_columns(200)
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set_cols = [f"other_{i}" for i in range(50)] # no overlap
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# Before
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t0 = time.perf_counter()
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for _ in range(1000):
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check_column_overlap_before(watched, set_cols)
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t_before = time.perf_counter() - t0
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# After
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t0 = time.perf_counter()
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for _ in range(1000):
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check_column_overlap_after(watched, set_cols)
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t_after = time.perf_counter() - t0
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speedup = t_before / t_after if t_after > 0 else float('inf')
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assert speedup >= 5.0, f"FAIL: speedup {speedup:.1f}x (expected >=5x)"
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print(f"PASS sqlite-0001 wide trigger: nId=200, nExpr=50, "
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f"1000 UPDATEs: before={t_before*1000:.1f}ms after={t_after*1000:.1f}ms "
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f"speedup={speedup:.0f}x")
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def test_sqlite_0003_wide_table():
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"""
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Wide parent table with composite FK referencing many columns.
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parent=500 columns, FK=50 columns at end (worst case — linear scan traverses full parent).
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Realistic for composite keys on wide ML feature tables.
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"""
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parent = make_columns(500)
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# FK columns near the end of parent — maximizes linear-scan cost
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fk = [f"column_name_{450+i:06d}" for i in range(50)]
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# Before
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t0 = time.perf_counter()
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for _ in range(1000):
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resolve_fk_columns_before(fk, parent)
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t_before = time.perf_counter() - t0
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# After
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t0 = time.perf_counter()
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for _ in range(1000):
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resolve_fk_columns_after(fk, parent)
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t_after = time.perf_counter() - t0
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speedup = t_before / t_after if t_after > 0 else float('inf')
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assert speedup >= 5.0, f"FAIL: speedup {speedup:.1f}x"
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print(f"PASS sqlite-0003 wide table: parent=500, FK=50, "
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f"1000 CREATE TABLEs: before={t_before*1000:.1f}ms after={t_after*1000:.1f}ms "
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f"speedup={speedup:.0f}x")
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def test_sqlite_scaling_ratio():
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"""5x scaling: nCol 100 -> 500 should give <7x time ratio (linear, not quadratic)."""
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for defect_label, fn_after in [("sqlite-0001", check_column_overlap_after),
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("sqlite-0003", resolve_fk_columns_after)]:
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small = make_columns(100)
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large = make_columns(500)
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if defect_label == "sqlite-0001":
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query_small = [f"other_{i}" for i in range(50)]
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query_large = [f"other_{i}" for i in range(50)]
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else:
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query_small = [f"column_name_{i*10:06d}" for i in range(5)]
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query_large = [f"column_name_{i*50:06d}" for i in range(5)]
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t0 = time.perf_counter()
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for _ in range(10_000):
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fn_after(small, query_small) if defect_label == "sqlite-0001" else fn_after(query_small, small)
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t_small = time.perf_counter() - t0
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t0 = time.perf_counter()
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for _ in range(10_000):
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fn_after(large, query_large) if defect_label == "sqlite-0001" else fn_after(query_large, large)
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t_large = time.perf_counter() - t0
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ratio = t_large / t_small if t_small > 0 else float('inf')
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assert ratio < 7.0, f"FAIL {defect_label}: scaling 5x gave {ratio:.1f}x (expected <7x)"
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print(f"PASS {defect_label} scaling: 100->500 cols (5x), time ratio={ratio:.1f}x (limit 7x)")
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if __name__ == "__main__":
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test_sqlite_0001_functional()
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test_sqlite_0003_functional()
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test_sqlite_0001_wide_trigger()
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test_sqlite_0003_wide_table()
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test_sqlite_scaling_ratio()
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print("ALL PASS")
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