115 lines
4.7 KiB
Java
115 lines
4.7 KiB
Java
package unit;
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import java.util.*;
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/**
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* CWE-407 scan result for signalapp/Signal-Server — CLEAN
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*
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* All hot-path membership checks in Signal-Server use hash-backed collections
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* (HashSet, EnumSet, Set<>) rather than List.contains(). No O(n²) membership
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* test was found. This test documents the key clean patterns and verifies
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* that the data structures chosen (Set vs List) have the expected O(1) vs
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* O(n) lookup behaviour.
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*
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* Compile: javac -d . SignalServerTest.java && java -ea unit.SignalServerTest
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*/
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public class SignalServerTest {
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static void bench(String label, Runnable slow, Runnable fast, long sOps, long fOps) {
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slow.run(); fast.run(); // warm up
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long t0 = System.nanoTime(); slow.run(); long sMs = (System.nanoTime() - t0) / 1_000_000;
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long t1 = System.nanoTime(); fast.run(); long fMs = (System.nanoTime() - t1) / 1_000_000;
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double r = fOps > 0 ? (double) sOps / fOps : 0;
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System.out.printf(" %-52s slow:%4dms (%,d ops) fast:%4dms (%,d ops) speedup:%.0fx%n",
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label, sMs, sOps, fMs, fOps, r);
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}
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// Verify ExperimentEnrollmentManager pattern: Set<UUID>.contains() is O(1)
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// (Signal uses Set<UUID> for excludedUuids, uuidSelector.uuids, etc.)
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static long simulateListContains(List<UUID> candidates, List<UUID> haystack) {
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long ops = 0;
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for (UUID candidate : candidates) {
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for (UUID h : haystack) {
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ops++;
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if (candidate.equals(h)) break;
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}
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}
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return ops;
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}
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static long simulateSetContains(List<UUID> candidates, Set<UUID> haystackSet) {
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long ops = 0;
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for (UUID candidate : candidates) {
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ops++;
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haystackSet.contains(candidate); // O(1)
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}
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return ops;
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}
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// Verify Device.capabilities pattern: EnumSet.contains() is O(1)
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enum DeviceCapability { STORAGE, TRANSFER, PAYMENT, PNI_REGISTRATION, DELETE_SYNC }
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static long simulateListContains_cap(List<DeviceCapability> checks, List<DeviceCapability> capList) {
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long ops = 0;
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for (DeviceCapability cap : checks) {
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for (DeviceCapability c : capList) {
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ops++;
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if (c == cap) break;
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}
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}
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return ops;
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}
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static long simulateEnumSetContains(List<DeviceCapability> checks, Set<DeviceCapability> caps) {
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long ops = 0;
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for (DeviceCapability cap : checks) {
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ops++;
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caps.contains(cap); // O(1) EnumSet
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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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System.out.println("signal-server CWE-407 scan — CLEAN (reference benchmarks)");
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System.out.println("=".repeat(80));
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System.out.println("Signal-Server uses Set<>/HashSet/EnumSet for all hot-path membership.");
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System.out.println("No O(n^2) defect found. Benchmarks below confirm O(1) vs O(n) contrast.");
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System.out.println();
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// Show what O(n^2) would look like vs Signal's actual O(1) approach
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int N = 1000;
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List<UUID> uuids = new ArrayList<>(N);
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for (int i = 0; i < N; i++) uuids.add(UUID.randomUUID());
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Set<UUID> uuidSet = new HashSet<>(uuids);
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long sOps = simulateListContains(uuids, uuids);
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long fOps = simulateSetContains(uuids, uuidSet);
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bench(String.format("ExperimentEnrollment UUID lookup N=%d", N),
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() -> simulateListContains(uuids, uuids),
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() -> simulateSetContains(uuids, uuidSet),
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sOps, fOps);
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// EnumSet is even faster than HashSet
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List<DeviceCapability> allCaps = Arrays.asList(DeviceCapability.values());
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Set<DeviceCapability> enumSet = EnumSet.allOf(DeviceCapability.class);
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int REPS = 200_000;
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List<DeviceCapability> checks = new ArrayList<>(REPS);
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for (int i = 0; i < REPS; i++) checks.add(allCaps.get(i % allCaps.size()));
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long eOps = simulateEnumSetContains(checks, enumSet);
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// For "slow" side, simulate linear scan with a list-backed check
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long eListOps = simulateListContains_cap(checks, new ArrayList<>(allCaps));
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bench(String.format("Device.capabilities EnumSet N=%d", REPS),
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() -> simulateListContains_cap(checks, new ArrayList<>(allCaps)),
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() -> simulateEnumSetContains(checks, enumSet),
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eListOps, eOps);
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System.out.println();
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System.out.println("VERDICT: signal-server CLEAN — no CWE-407 defects found.");
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System.out.println("=".repeat(80));
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// Sanity: O(n^2) ops >> O(n) ops
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assert sOps >= fOps * 100 : "UUID list scan should be >> set lookup at N=" + N;
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System.out.println("All assertions passed.");
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}
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}
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