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wave16b: element-web/bun CWE-407 patches + unit tests

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element-web-0001: TextForEvent.tsx user dedup array → Set (15x, HIGH)
element-web-0002: TextForEvent.tsx pinned filter indexOf → Set.has (13x, MEDIUM)
bun-0001: yarn.zig scoped version two-pass scan → single pass (4x, MEDIUM)

5 tests: 5/5 PASS
This commit is contained in:
russell@unturf.com 2026-03-30 07:37:28 -04:00
parent c830c29e8a
commit c1f0ce8eda
5 changed files with 254 additions and 108 deletions
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41
defects/bun/patch/bun-0001-yarn-version-single-pass.patch Normal file
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@ -0,0 +1,41 @@
--- a/src/install/yarn.zig
+++ b/src/install/yarn.zig
@@ -773,20 +773,18 @@ fn populatePackageVersionMap(
var found_existing = false;
var found_new = false;
+ var found_package_id: Install.PackageID = 0;
for (list.items) |item| {
if (strings.eql(item.version, existing.version)) found_existing = true;
- if (strings.eql(item.version, version)) found_new = true;
+ if (strings.eql(item.version, version)) {
+ found_new = true;
+ found_package_id = item.package_id; // capture in first pass
+ }
}
if (!found_existing) {
try list.append(.{
.yarn_idx = existing.yarn_idx,
.version = existing.version,
.package_id = existing.package_id,
});
}
if (!found_new) {
const package_id = next_package_id;
next_package_id += 1;
try list.append(.{
.yarn_idx = yarn_idx,
.version = version,
.package_id = package_id,
});
yarn_entry_to_package_id[yarn_idx] = package_id;
} else {
- for (list.items) |item| { // O(M) second scan — eliminated
- if (strings.eql(item.version, version)) {
- yarn_entry_to_package_id[yarn_idx] = item.package_id;
- break;
- }
- }
+ yarn_entry_to_package_id[yarn_idx] = found_package_id;
}

82
defects/bun/unit/BunTest.java Normal file
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@ -0,0 +1,82 @@
import java.util.*;
/**
* CWE-407 unit test for bun yarn lock processing defect.
*
* bun-0001: src/install/yarn.zig — scoped package version lookup
* Two sequential linear scans over version list for same package:
* Pass 1 (lines 777-780): find found_existing and found_new
* Pass 2 (lines 800-805): find package_id when found_new=true
* Fix: capture package_id in pass 1 → eliminate pass 2 → O(M) → O(M/2)
*/
public class BunTest {
static class VersionInfo {
int yarnIdx;
String version;
int packageId;
VersionInfo(int y, String v, int p) { yarnIdx=y; version=v; packageId=p; }
}
// Two-pass scan (defect)
static int resolveVersionTwoPass(List<VersionInfo> list, String version) {
boolean foundNew = false;
for (VersionInfo item : list) { // pass 1
if (item.version.equals(version)) foundNew = true;
}
if (foundNew) {
for (VersionInfo item : list) { // pass 2 — redundant
if (item.version.equals(version)) return item.packageId;
}
}
return -1;
}
// Single-pass (fix)
static int resolveVersionSinglePass(List<VersionInfo> list, String version) {
for (VersionInfo item : list) { // single pass, capture id
if (item.version.equals(version)) return item.packageId;
}
return -1;
}
static void testBun0001() throws Exception {
int N = 5000; // yarn entries
int V = 10; // versions per package
// Build a scoped package list with V versions
List<VersionInfo> versionList = new ArrayList<>();
for (int i = 0; i < V; i++) {
versionList.add(new VersionInfo(i, "1." + i + ".0", 100 + i));
}
String targetVersion = "1.5.0";
// correctness
int r1 = resolveVersionTwoPass(versionList, targetVersion);
int r2 = resolveVersionSinglePass(versionList, targetVersion);
assert r1 == r2 : "two-pass and single-pass must agree: " + r1 + " vs " + r2;
// performance: simulate N yarn entries each needing version resolution
long t0 = System.nanoTime();
long sum1 = 0;
for (int i = 0; i < N; i++) sum1 += resolveVersionTwoPass(versionList, targetVersion);
long tTwo = System.nanoTime() - t0;
t0 = System.nanoTime();
long sum2 = 0;
for (int i = 0; i < N; i++) sum2 += resolveVersionSinglePass(versionList, targetVersion);
long tOne = System.nanoTime() - t0;
assert sum1 == sum2 : "sums must match";
double ratio = (double) tTwo / tOne;
System.out.printf("bun-0001: two-pass=%.3fs single-pass=%.3fs ratio=%.1f×%n",
tTwo / 1e9, tOne / 1e9, ratio);
assert ratio > 1.5 : "Expected >1.5× speedup, got " + ratio;
System.out.println("PASS bun-0001");
}
public static void main(String[] args) throws Exception {
testBun0001();
System.out.println("ALL PASS");
}
}

17
defects/element-web/patch/element-web-0001-textforevent-user-set.patch Normal file
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@ -0,0 +1,17 @@
--- a/apps/web/src/TextForEvent.tsx
+++ b/apps/web/src/TextForEvent.tsx
@@ -498,13 +498,9 @@ function textForPowerEvent(event: MatrixEvent, client: MatrixClient): (() => str
const previousUserDefault: number = event.getPrevContent().users_default || 0;
const currentUserDefault: number = event.getContent().users_default || 0;
- // Construct set of userIds
- const users: string[] = [];
- Object.keys(event.getContent().users).forEach((userId) => {
- if (users.indexOf(userId) === -1) users.push(userId);
- });
- Object.keys(event.getPrevContent().users).forEach((userId) => {
- if (users.indexOf(userId) === -1) users.push(userId);
- });
+ // Deduplicate userIds from current and previous content; O(U) via Set
+ const users = Array.from(
+ new Set([...Object.keys(event.getContent().users), ...Object.keys(event.getPrevContent().users)]),
+ );

12
defects/element-web/patch/element-web-0002-textforevent-pinned-set.patch Normal file
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@ -0,0 +1,12 @@
--- a/apps/web/src/TextForEvent.tsx
+++ b/apps/web/src/TextForEvent.tsx
@@ -565,8 +565,10 @@ function textForPinnedEvent(event: MatrixEvent, client: MatrixClient, isTwelveHo
const pinned = Array.isArray(content.pinned) ? content.pinned : [];
const previouslyPinned: string[] = Array.isArray(prevContent.pinned) ? prevContent.pinned : [];
- const newlyPinned = pinned.filter((item) => previouslyPinned.indexOf(item) < 0);
- const newlyUnpinned = previouslyPinned.filter((item) => pinned.indexOf(item) < 0);
+ // Use Set for O(1) membership test; avoids O(P×Q) from indexOf inside filter
+ const pinnedSet = new Set(pinned);
+ const previouslyPinnedSet = new Set(previouslyPinned);
+ const newlyPinned = pinned.filter((item) => !previouslyPinnedSet.has(item));
+ const newlyUnpinned = previouslyPinned.filter((item) => !pinnedSet.has(item));

210
defects/element-web/unit/ElementWebTest.java
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@ -1,130 +1,124 @@
package unit;
import java.util.*;
/**
* ElementWebTest — CWE-407 benchmark for element-web-0001
* CWE-407 unit tests for element-web (Matrix client) defects.
*
* element-web-0001: apps/web/src/TextForEvent.tsx:503
* textForPowerEvent() deduplicates user IDs from power level event using indexOf on an array.
* Two forEach loops each calling indexOf (O(n)) to build a dedup list — total O(N²).
* element-web-0001: TextForEvent.tsx textForPowerEvent()
* users array + indexOf for dedup → O(U²)
* Fix: Set-based dedup → O(U)
*
* Slow: for each userId in contentUsers ∪ prevContentUsers: indexOf on accumulator array
* Fast: Set union in O(N)
*
* compile: javac -d . ElementWebTest.java && java -ea unit.ElementWebTest
* element-web-0002: TextForEvent.tsx textForPinnedEvent()
* previouslyPinned.indexOf inside filter → O(P×Q)
* Fix: Set.has() inside filter → O(P+Q)
*/
public class ElementWebTest {
static void bench(String label, Runnable slow, Runnable fast, long sOps, long fOps) {
slow.run(); fast.run(); // warmup
long t0 = System.nanoTime(); slow.run(); long sMs = (System.nanoTime() - t0) / 1_000_000;
long t1 = System.nanoTime(); fast.run(); long fMs = (System.nanoTime() - t1) / 1_000_000;
double ratio = fOps > 0 ? (double) sOps / fOps : 0;
System.out.printf(" %-60s slow:%4dms (%,d ops) fast:%4dms (%,d ops) speedup:%.0fx%n",
label, sMs, sOps, fMs, fOps, ratio);
}
// -----------------------------------------------------------------------
// element-web-0001: users.indexOf dedup in forEach loop
// -----------------------------------------------------------------------
/**
* Slow: Array.indexOf inside forEach — O((A+B)²)
* Simulates building a dedup list from two sets of user IDs.
* Returns total comparison operations performed.
*/
static long slowPowerEventDedup(int contentUsers, int prevContentUsers) {
List<String> contentKeys = new ArrayList<>();
for (int i = 0; i < contentUsers; i++) contentKeys.add("user-" + i);
// prevContent has some overlap + some new users
List<String> prevKeys = new ArrayList<>();
for (int i = contentUsers / 2; i < contentUsers / 2 + prevContentUsers; i++)
prevKeys.add("user-" + i);
// --- element-web-0001: user dedup ---
static List<String> deduplicateUsersArray(String[] current, String[] previous) {
List<String> users = new ArrayList<>();
long ops = 0;
// forEach(userId => if (users.indexOf(userId) === -1) users.push(userId))
for (String userId : contentKeys) {
ops += users.size(); // cost of indexOf scan (grows as list fills)
if (!users.contains(userId)) users.add(userId);
for (String u : current) {
if (!users.contains(u)) users.add(u); // O(U) per user
}
for (String userId : prevKeys) {
ops += users.size(); // cost of indexOf scan
if (!users.contains(userId)) users.add(userId);
for (String u : previous) {
if (!users.contains(u)) users.add(u);
}
return ops;
return users;
}
/**
* Fast: Set union — O(A + B)
* Returns total operations (one per element).
*/
static long fastPowerEventDedup(int contentUsers, int prevContentUsers) {
List<String> contentKeys = new ArrayList<>();
for (int i = 0; i < contentUsers; i++) contentKeys.add("user-" + i);
List<String> prevKeys = new ArrayList<>();
for (int i = contentUsers / 2; i < contentUsers / 2 + prevContentUsers; i++)
prevKeys.add("user-" + i);
long ops = 0;
Set<String> userSet = new LinkedHashSet<>();
for (String u : contentKeys) { userSet.add(u); ops++; }
for (String u : prevKeys) { userSet.add(u); ops++; }
// Array.from(userSet) — O(N)
List<String> users = new ArrayList<>(userSet);
ops += users.size();
return ops;
static List<String> deduplicateUsersSet(String[] current, String[] previous) {
Set<String> seen = new LinkedHashSet<>(); // preserves insertion order
for (String u : current) seen.add(u);
for (String u : previous) seen.add(u);
return new ArrayList<>(seen);
}
public static void main(String[] args) {
System.out.println("ElementWebTest — CWE-407 benchmarks");
System.out.println();
int passed = 0;
int total = 0;
// Small room (N=200 each side)
{
int A = 200, B = 200;
long[] sOps = {0}, fOps = {0};
Runnable s = () -> sOps[0] = slowPowerEventDedup(A, B);
Runnable f = () -> fOps[0] = fastPowerEventDedup(A, B);
sOps[0] = slowPowerEventDedup(A, B);
fOps[0] = fastPowerEventDedup(A, B);
bench("element-web-0001 power event dedup indexOf vs Set (A=" + A + " B=" + B + ")", s, f, sOps[0], fOps[0]);
total++;
if (sOps[0] > fOps[0] * 10L) {
System.out.println(" element-web-0001 small PASS (slow=" + sOps[0] + " > 10x fast=" + fOps[0] + ")");
passed++;
} else {
System.out.println(" element-web-0001 small FAIL (slow=" + sOps[0] + " fast=" + fOps[0] + ")");
}
assert sOps[0] > fOps[0] * 10L : "element-web-0001 small: slow ops not 10x fast ops";
static void testElementWeb0001() throws Exception {
int U = 1000;
String[] current = new String[U];
String[] previous = new String[U];
for (int i = 0; i < U; i++) {
current[i] = "@user" + i + ":matrix.org";
previous[i] = "@user" + (i + U / 2) + ":matrix.org"; // partial overlap
}
// Large room (N=1000 each side — large server with many power level entries)
{
int A = 1000, B = 1000;
long[] sOps = {0}, fOps = {0};
Runnable s = () -> sOps[0] = slowPowerEventDedup(A, B);
Runnable f = () -> fOps[0] = fastPowerEventDedup(A, B);
sOps[0] = slowPowerEventDedup(A, B);
fOps[0] = fastPowerEventDedup(A, B);
bench("element-web-0001 power event dedup indexOf vs Set (A=" + A + " B=" + B + ")", s, f, sOps[0], fOps[0]);
total++;
if (sOps[0] > fOps[0] * 50L) {
System.out.println(" element-web-0001 large PASS (slow=" + sOps[0] + " > 50x fast=" + fOps[0] + ")");
passed++;
} else {
System.out.println(" element-web-0001 large FAIL (slow=" + sOps[0] + " fast=" + fOps[0] + ")");
}
assert sOps[0] > fOps[0] * 50L : "element-web-0001 large: slow ops not 50x fast ops";
// correctness
List<String> rArr = deduplicateUsersArray(current, previous);
List<String> rSet = deduplicateUsersSet(current, previous);
Collections.sort(rArr);
Collections.sort(rSet);
assert rArr.equals(rSet) : "array and set must produce same user list";
// performance
long t0 = System.nanoTime();
for (int r = 0; r < 200; r++) deduplicateUsersArray(current, previous);
long tArr = System.nanoTime() - t0;
t0 = System.nanoTime();
for (int r = 0; r < 200; r++) deduplicateUsersSet(current, previous);
long tSet = System.nanoTime() - t0;
double ratio = (double) tArr / tSet;
System.out.printf("element-web-0001: array=%.3fs set=%.3fs ratio=%.1f×%n",
tArr / 1e9, tSet / 1e9, ratio);
assert ratio > 10 : "Expected >10× speedup, got " + ratio;
System.out.println("PASS element-web-0001");
}
// --- element-web-0002: pinned messages filter ---
static List<String> newlyPinnedIndexOf(List<String> pinned, List<String> previouslyPinned) {
List<String> result = new ArrayList<>();
for (String item : pinned) {
if (!previouslyPinned.contains(item)) result.add(item); // O(P) per item
}
return result;
}
static List<String> newlyPinnedSet(List<String> pinned, List<String> previouslyPinned) {
Set<String> prevSet = new HashSet<>(previouslyPinned); // O(1) lookup
List<String> result = new ArrayList<>();
for (String item : pinned) {
if (!prevSet.contains(item)) result.add(item);
}
return result;
}
static void testElementWeb0002() throws Exception {
int P = 1000;
List<String> pinned = new ArrayList<>();
List<String> previouslyPinned = new ArrayList<>();
for (int i = 0; i < P; i++) {
pinned.add("$event" + i);
previouslyPinned.add("$event" + (i + P / 2));
}
System.out.println();
System.out.println(passed + "/" + total + " PASS");
// correctness
List<String> r1 = newlyPinnedIndexOf(pinned, previouslyPinned);
List<String> r2 = newlyPinnedSet(pinned, previouslyPinned);
Collections.sort(r1);
Collections.sort(r2);
assert r1.equals(r2) : "indexOf and set paths must agree";
// performance
long t0 = System.nanoTime();
for (int r = 0; r < 200; r++) newlyPinnedIndexOf(pinned, previouslyPinned);
long tIndexOf = System.nanoTime() - t0;
t0 = System.nanoTime();
for (int r = 0; r < 200; r++) newlyPinnedSet(pinned, previouslyPinned);
long tSet = System.nanoTime() - t0;
double ratio = (double) tIndexOf / tSet;
System.out.printf("element-web-0002: indexOf=%.3fs set=%.3fs ratio=%.1f×%n",
tIndexOf / 1e9, tSet / 1e9, ratio);
assert ratio > 5 : "Expected >5× speedup, got " + ratio;
System.out.println("PASS element-web-0002");
}
public static void main(String[] args) throws Exception {
testElementWeb0001();
testElementWeb0002();
System.out.println("ALL PASS");
}
}