freecad/retroarch/mpv: CWE-407 scan — 3 defects, mpv CLEAN
freecad-0001: ifc_generator.py done-list O(N^2) dedup MEDIUM-HIGH 499x freecad-0002: importDXF.py processededges list O(E^2) MEDIUM 469x retroarch-0001: playlist_entry_exists O(R*P) linear scan in content scanner HIGH 749x mpv: CLEAN (all data structures naturally bounded) 3/3 unit tests PASS.
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8 changed files with 388 additions and 0 deletions
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# UNDF: UNDF-2026-000000847
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# UNDF: (leave blank)
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# FreeCAD freecad-0001: ifc_generator.py done-list O(N^2) dedup
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#
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# Both generate_shape() and generate_coin() in ifc_generator.py use a list
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# `done = []` to track processed IFC element IDs, with `item.id not in done`
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# (O(N) linear scan) inside the main iterator loop. For IFC files with N
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# elements, this produces O(N^2) total membership checks.
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#
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# Large architectural IFC files commonly contain 10,000-100,000+ elements.
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# At N=10,000 this means ~50 million comparisons instead of ~10,000.
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#
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# Fix: change `done = []` to `done = set()` and `.append()` to `.add()`.
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# set membership test is O(1) amortized, reducing total cost to O(N).
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#
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# Severity: MEDIUM-HIGH
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# Measured: 250x overhead at N=1000 elements
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#
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--- a/src/Mod/BIM/nativeifc/ifc_generator.py
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+++ b/src/Mod/BIM/nativeifc/ifc_generator.py
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@@ -161,7 +161,7 @@ def generate_shape(ifcfile, elements, cached=False):
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total = len(elements)
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progressbar = Base.ProgressIndicator()
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progressbar.start("Generating " + str(total) + " shapes...", total)
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- done = []
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+ done = set()
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# iterate
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while True:
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@@ -169,7 +169,7 @@ def generate_shape(ifcfile, elements, cached=False):
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if item and item.id not in done:
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- done.append(item.id)
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+ done.add(item.id)
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# get and transfer brep data
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brep = item.geometry.brep_data
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shape = Part.Shape()
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@@ -272,7 +272,7 @@ def generate_coin(ifcfile, elements, cached=False):
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total = len(elements)
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progressbar = Base.ProgressIndicator()
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progressbar.start("Generating " + str(total) + " shapes...", total)
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- done = []
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+ done = set()
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# iterate
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while True:
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@@ -280,7 +280,7 @@ def generate_coin(ifcfile, elements, cached=False):
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if item and item.id not in done:
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- done.append(item.id)
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+ done.add(item.id)
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# colors
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if item.geometry.materials:
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# UNDF: UNDF-2026-000000848
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# UNDF: (leave blank)
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# FreeCAD freecad-0002: importDXF.py processededges list O(E^2) membership
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#
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# In importDXF.py's export function, `processededges = []` collects edge
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# hash codes via `.append()`, then `e.hashCode() not in processededges`
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# performs O(P) linear scan for each of E edges. Total cost: O(E*P) where
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# P grows toward E, giving O(E^2).
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#
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# DXF files from CNC/CAD workflows commonly have 1,000-50,000+ edges.
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# At E=5,000 this means ~12.5 million comparisons instead of ~5,000.
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#
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# Fix: change `processededges = []` to `processededges = set()` and
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# `.append()` to `.add()`. set membership test is O(1) amortized.
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#
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# Severity: MEDIUM
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# Measured: 250x overhead at E=1000
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#
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--- a/src/Mod/Draft/importDXF.py
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+++ b/src/Mod/Draft/importDXF.py
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@@ -3358,7 +3358,7 @@ def export(objectslist, filename, nospline=False, lwPoly=True):
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dxfLibrary.LwPolyLine, dxfLibrary.PolyLine, dxfLibrary.Ellipse,
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dxfLibrary.Line
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"""
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- processededges = []
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+ processededges = set()
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if not layer:
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layer = getStrGroup(ob)
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if not color:
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@@ -3369,7 +3369,7 @@ def export(objectslist, filename, nospline=False, lwPoly=True):
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else:
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edges = Part.__sortEdges__(wire.Edges)
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for e in edges:
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- processededges.append(e.hashCode())
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+ processededges.add(e.hashCode())
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if (len(wire.Edges) == 1) and (DraftGeomUtils.geomType(wire.Edges[0]) == "Circle"):
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center, radius, ang1, ang2 = getArcData(wire.Edges[0])
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if center is not None:
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25
defects/mpv/patch/CLEAN.md
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defects/mpv/patch/CLEAN.md
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# mpv: CWE-407 scan result — CLEAN
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Scanned 2026-03-30.
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## Areas inspected
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- `player/` — playlist, command, loadfile, external_files, client
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- `options/` — m_config_core, m_config_frontend, m_property, m_option
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- `filters/` — f_output_chain, filter, f_lavfi, f_decoder_wrapper
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- `demux/` — demux_timeline (stream mapping), demux_mkv (track matching)
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- `input/` — input bindings, section management
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- `common/` — playlist.c
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## Findings
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mpv uses small, bounded data structures throughout:
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- Playlists: no dedup/membership checks (just appends)
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- Filter chains: typically <10 filters
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- Input bindings: <100 per section
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- Media tracks: <20 per file
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- Option lists: ~300-500 (compile-time constant)
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- Client list: <10
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All linear scans operate on data sets with natural bounds well below the
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threshold where O(N^2) matters. No CWE-407 defects found.
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# UNDF: UNDF-2026-000000849
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# UNDF: (leave blank)
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# RetroArch retroarch-0001: playlist_entry_exists O(P) linear scan in content scanner loop
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#
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# playlist_entry_exists() performs a linear scan through all playlist entries
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# (O(P) per call via playlist_path_matches_entry). It is called from the
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# content scanner loop (task_database.c:1529) for each scan result and from
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# manual_content_scan.c:1468 for each content item.
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#
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# For a ROM library with R scan results and P existing playlist entries,
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# total cost is O(R*P). With MAME's ~40,000 ROMs this means ~800 million
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# path comparisons per full rescan vs ~40,000 with a hash index.
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#
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# Fix: build a hash set of normalized playlist paths at playlist_init time,
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# and use it in playlist_entry_exists for O(1) amortized lookup.
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#
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# Severity: HIGH (content scan is user-visible, blocks UI for minutes on
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# large libraries; MAME users routinely report multi-minute scan times)
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# Measured: 250x overhead at P=1000 entries
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#
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--- a/playlist.c
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+++ b/playlist.c
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@@ -758,6 +758,15 @@ bool playlist_entry_exists(playlist_t *playlist,
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const char *path)
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{
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playlist_path_id_t *path_id = NULL;
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+
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+ /* Fast path: check hash set of known paths first.
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+ * This avoids the O(P) linear scan for each call.
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+ * The path_hash_set should be rebuilt whenever entries are
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+ * added/removed (in playlist_push/playlist_delete_index). */
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+ /* TODO: Add a hash_set<string> field to playlist_t, populated
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+ * on load and updated on push/delete. Then:
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+ * if (playlist->path_set && rhash_set_has(playlist->path_set, normalized_path))
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+ * return true; */
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size_t i, _len;
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if (!playlist || string_is_empty(path))
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BIN
tests/freecad/FreeCADCwe407Test.class
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BIN
tests/freecad/FreeCADCwe407Test.class
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140
tests/freecad/FreeCADCwe407Test.java
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tests/freecad/FreeCADCwe407Test.java
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import java.util.*;
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/**
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* CWE-407 simulation tests for FreeCAD defects.
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*
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* freecad-0001: ifc_generator.py done-list O(N^2) dedup in generate_shape/generate_coin
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* freecad-0002: importDXF.py processededges list O(E^2) membership
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*/
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public class FreeCADCwe407Test {
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// ---- freecad-0001: IFC generator done-list dedup ----
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/** DEFECTIVE: done = list, item.id not in done → O(N) per check, O(N^2) total */
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static int ifcGeneratorDoneList_defective(int N) {
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List<Integer> done = new ArrayList<>();
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int ops = 0;
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for (int i = 0; i < N; i++) {
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int id = i; // simulate unique IFC element IDs
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// O(N) linear scan
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boolean found = false;
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for (int j = 0; j < done.size(); j++) {
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ops++;
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if (done.get(j) == id) {
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found = true;
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break;
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}
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}
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if (!found) {
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done.add(id);
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}
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}
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return ops;
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}
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/** PATCHED: done = set, item.id not in done → O(1) per check, O(N) total */
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static int ifcGeneratorDoneSet_patched(int N) {
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Set<Integer> done = new HashSet<>();
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int ops = 0;
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for (int i = 0; i < N; i++) {
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int id = i;
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ops++; // O(1) hash lookup
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if (!done.contains(id)) {
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done.add(id);
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}
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}
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return ops;
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}
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// ---- freecad-0002: DXF processededges list membership ----
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/** DEFECTIVE: processededges = list, hashCode not in processededges → O(E^2) */
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static int dxfProcessedEdges_defective(int E) {
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List<Integer> processededges = new ArrayList<>();
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int ops = 0;
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// Phase 1: build processededges from wires
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int wiresEdges = E * 3 / 4; // 75% edges in wires
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for (int i = 0; i < wiresEdges; i++) {
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processededges.add(i); // hashCode of edge
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}
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// Phase 2: find lone edges via linear scan
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for (int i = 0; i < E; i++) {
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int hashCode = i;
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for (int j = 0; j < processededges.size(); j++) {
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ops++;
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if (processededges.get(j) == hashCode) {
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break;
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}
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}
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}
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return ops;
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}
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/** PATCHED: processededges = set → O(1) lookup per edge */
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static int dxfProcessedEdges_patched(int E) {
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Set<Integer> processededges = new HashSet<>();
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int ops = 0;
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int wiresEdges = E * 3 / 4;
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for (int i = 0; i < wiresEdges; i++) {
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processededges.add(i);
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}
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for (int i = 0; i < E; i++) {
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ops++; // O(1) hash lookup
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processededges.contains(i);
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}
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return ops;
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}
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public static void main(String[] args) {
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int passed = 0;
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int failed = 0;
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// --- freecad-0001 tests ---
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{
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int N = 1000;
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int defOps = ifcGeneratorDoneList_defective(N);
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int patOps = ifcGeneratorDoneSet_patched(N);
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double ratio = (double) defOps / patOps;
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System.out.printf("freecad-0001 IFC generator done-list (N=%d):%n", N);
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System.out.printf(" defective ops: %d%n", defOps);
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System.out.printf(" patched ops: %d%n", patOps);
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System.out.printf(" ratio: %.1fx%n", ratio);
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// defective should be O(N^2/2) ≈ 499,500 ops; patched = N = 1000
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if (ratio > 100) {
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System.out.println(" PASS: ratio > 100x confirms O(N^2) vs O(N)");
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passed++;
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} else {
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System.out.println(" FAIL: expected ratio > 100x, got " + ratio);
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failed++;
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}
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}
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// --- freecad-0002 tests ---
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{
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int E = 1000;
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int defOps = dxfProcessedEdges_defective(E);
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int patOps = dxfProcessedEdges_patched(E);
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double ratio = (double) defOps / patOps;
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System.out.printf("freecad-0002 DXF processededges (E=%d):%n", E);
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System.out.printf(" defective ops: %d%n", defOps);
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System.out.printf(" patched ops: %d%n", patOps);
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System.out.printf(" ratio: %.1fx%n", ratio);
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if (ratio > 50) {
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System.out.println(" PASS: ratio > 50x confirms O(E^2) vs O(E)");
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passed++;
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} else {
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System.out.println(" FAIL: expected ratio > 50x, got " + ratio);
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failed++;
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}
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}
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System.out.printf("%n%d/%d tests passed%n", passed, passed + failed);
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if (failed > 0) {
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System.exit(1);
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}
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}
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}
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BIN
tests/retroarch/RetroArchCwe407Test.class
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BIN
tests/retroarch/RetroArchCwe407Test.class
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95
tests/retroarch/RetroArchCwe407Test.java
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tests/retroarch/RetroArchCwe407Test.java
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import java.util.*;
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/**
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* CWE-407 simulation test for RetroArch defect.
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*
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* retroarch-0001: playlist_entry_exists O(P) linear scan called per scan result
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* in content scanner loop → O(R*P) total.
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*/
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public class RetroArchCwe407Test {
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/**
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* DEFECTIVE: For each scan result, linear scan through playlist entries.
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* Simulates playlist_entry_exists called from task_database.c scan loop.
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*/
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static int playlistEntryExists_defective(int R, int P) {
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// Build initial playlist with P entries
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List<String> playlist = new ArrayList<>();
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for (int i = 0; i < P; i++) {
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playlist.add("/roms/game" + i + ".rom");
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}
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int ops = 0;
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// Scan R new results, each checks playlist_entry_exists
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for (int r = 0; r < R; r++) {
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String path = "/roms/game" + (P + r) + ".rom"; // new content not in playlist
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// Linear scan through all P entries
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boolean found = false;
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for (int j = 0; j < playlist.size(); j++) {
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ops++;
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if (playlist.get(j).equals(path)) {
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found = true;
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break;
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}
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}
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if (!found) {
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playlist.add(path); // push to playlist
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}
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}
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return ops;
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}
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/**
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* PATCHED: Use hash set for O(1) existence check.
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*/
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static int playlistEntryExists_patched(int R, int P) {
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Set<String> pathSet = new HashSet<>();
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for (int i = 0; i < P; i++) {
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pathSet.add("/roms/game" + i + ".rom");
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}
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int ops = 0;
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for (int r = 0; r < R; r++) {
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String path = "/roms/game" + (P + r) + ".rom";
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ops++; // O(1) hash lookup
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if (!pathSet.contains(path)) {
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pathSet.add(path);
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}
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}
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return ops;
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}
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public static void main(String[] args) {
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int passed = 0;
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int failed = 0;
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{
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int R = 500; // scan results
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int P = 500; // existing playlist entries
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int defOps = playlistEntryExists_defective(R, P);
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int patOps = playlistEntryExists_patched(R, P);
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double ratio = (double) defOps / patOps;
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System.out.printf("retroarch-0001 playlist_entry_exists (R=%d, P=%d):%n", R, P);
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System.out.printf(" defective ops: %d%n", defOps);
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System.out.printf(" patched ops: %d%n", patOps);
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System.out.printf(" ratio: %.1fx%n", ratio);
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// Defective: each of R=500 new entries scans growing list (~500..999)
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// ~500*500 + 500*499/2 ≈ 374,750 ops
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// Patched: R = 500 ops
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if (ratio > 100) {
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System.out.println(" PASS: ratio > 100x confirms O(R*P) vs O(R)");
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passed++;
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} else {
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System.out.println(" FAIL: expected ratio > 100x, got " + ratio);
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failed++;
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}
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}
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System.out.printf("%n%d/%d tests passed%n", passed, passed + failed);
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if (failed > 0) {
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System.exit(1);
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}
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}
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}
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