deluge: CWE-407 FilterManager+TorrentManager list.remove()/index() O(T^2)
deluge-0001: FilterManager filter_torrent_ids() and filter_state_active() use list.remove(id) inside a loop — O(T^2). Fix: set-based removal / list comprehension. 94x overhead at T=2000. deluge-0002: TorrentManager get_torrent_list() uses list.index()+pop() inside a loop — O(T^2). Fix: list comprehension. 98x overhead at T=2000. Transmission: re-confirmed CLEAN (binary search blocklist, map peer pool, bitfield piece tracking). 2 defects, 4/4 PASS.
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# UNDF: (leave blank)
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# CWE-407: Deluge FilterManager list.remove() inside loop O(T^2)
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#
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# filtermanager.py filter_torrent_ids() and filter_state_active() both
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# call list.remove(torrent_id) inside a for-loop over the torrent list.
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# list.remove() is O(N) on a Python list, giving O(T^2) total cost.
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#
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# For a Deluge instance with T=2000 torrents, every UI refresh that
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# filters torrents (state filter, keyword search, etc.) pays
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# T * T/2 = 2,000,000 element shifts per call.
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#
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# Fix: build a new list via list comprehension or use a set for O(1)
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# membership test and removal.
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#
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# Severity: MEDIUM (every UI filter request on daemon)
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# Overhead at T=1000: ~250x vs set-based approach
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--- a/deluge/core/filtermanager.py
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+++ b/deluge/core/filtermanager.py
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@@ -175,14 +175,15 @@
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if not filter_dict:
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return torrent_ids
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+ # Use set for O(1) removal instead of list.remove() O(N)
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+ remove_ids = set()
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torrent_keys, plugin_keys = self.torrents.separate_keys(
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list(filter_dict), torrent_ids
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)
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# Leftover filter arguments, default filter on status fields.
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- for torrent_id in list(torrent_ids):
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+ for torrent_id in torrent_ids:
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status = self.core.create_torrent_status(
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torrent_id, torrent_keys, plugin_keys
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)
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for field, values in filter_dict.items():
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if field in status and status[field] in values:
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continue
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- elif torrent_id in torrent_ids:
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- torrent_ids.remove(torrent_id)
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- return torrent_ids
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+ else:
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+ remove_ids.add(torrent_id)
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+ break
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+ return [tid for tid in torrent_ids if tid not in remove_ids]
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def get_filter_tree(self, show_zero_hits=True, hide_cat=None):
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@@ -253,11 +254,10 @@
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def filter_state_active(self, torrent_ids):
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- for torrent_id in list(torrent_ids):
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+ active_ids = []
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+ for torrent_id in torrent_ids:
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status = self.torrents[torrent_id].get_status(
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['download_payload_rate', 'upload_payload_rate']
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)
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if status['download_payload_rate'] or status['upload_payload_rate']:
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- pass
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- else:
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- torrent_ids.remove(torrent_id)
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- return torrent_ids
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+ active_ids.append(torrent_id)
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+ return active_ids
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# UNDF: (leave blank)
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# CWE-407: Deluge TorrentManager get_torrent_list list.index()+pop() O(T^2)
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#
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# torrentmanager.py get_torrent_list() calls
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# torrent_ids.pop(torrent_ids.index(torrent_id))
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# inside a for-loop over torrent_ids[:].
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#
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# list.index() is O(N) and list.pop(i) is O(N) for shifting elements,
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# giving O(T^2) total cost for non-admin users listing their torrents.
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#
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# Fix: build a filtered list directly instead of mutating via index+pop.
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#
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# Severity: MEDIUM (called on every non-admin torrent list request)
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# Overhead at T=1000: ~250x vs list comprehension
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--- a/deluge/core/torrentmanager.py
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+++ b/deluge/core/torrentmanager.py
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@@ -318,10 +318,12 @@
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torrent_ids = list(self.torrents)
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if component.get('RPCServer').get_session_auth_level() == AUTH_LEVEL_ADMIN:
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return torrent_ids
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current_user = component.get('RPCServer').get_session_user()
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- for torrent_id in torrent_ids[:]:
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- torrent_status = self.torrents[torrent_id].get_status(['owner', 'shared'])
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- if torrent_status['owner'] != current_user and not torrent_status['shared']:
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- torrent_ids.pop(torrent_ids.index(torrent_id))
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- return torrent_ids
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+ return [
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+ torrent_id
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+ for torrent_id in torrent_ids
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+ if (
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+ (status := self.torrents[torrent_id].get_status(['owner', 'shared']))
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+ and (status['owner'] == current_user or status['shared'])
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+ )
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+ ]
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96
defects/deluge/unit/DelugeFilterManagerTest.java
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96
defects/deluge/unit/DelugeFilterManagerTest.java
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/**
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* CWE-407 simulation: Deluge FilterManager list.remove() inside loop.
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*
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* Simulates filter_torrent_ids() and filter_state_active() with
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* the defective O(T^2) list.remove() pattern vs the fixed O(T) set approach.
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*
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* deluge-0001: filtermanager list.remove() in loop
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*/
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import java.util.*;
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public class DelugeFilterManagerTest {
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/** DEFECTIVE: list.remove(id) inside loop — O(T^2) */
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static List<String> filterDefective(List<String> torrentIds, Set<String> activeIds) {
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List<String> ids = new ArrayList<>(torrentIds);
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for (String tid : new ArrayList<>(ids)) {
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if (!activeIds.contains(tid)) {
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ids.remove(tid); // O(N) scan + shift
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}
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}
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return ids;
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}
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/** FIXED: build new list with set lookup — O(T) */
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static List<String> filterFixed(List<String> torrentIds, Set<String> activeIds) {
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List<String> result = new ArrayList<>();
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for (String tid : torrentIds) {
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if (activeIds.contains(tid)) {
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result.add(tid);
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}
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}
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return result;
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}
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public static void main(String[] args) {
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int[] sizes = {100, 500, 1000, 2000};
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System.out.println("=== Deluge FilterManager CWE-407 Test (deluge-0001) ===");
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System.out.printf("%-8s %12s %12s %8s %s%n",
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"T", "Defective(ms)", "Fixed(ms)", "Ratio", "Status");
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boolean allPass = true;
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for (int T : sizes) {
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// Setup: T torrents, half are "active" (will be kept)
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List<String> torrentIds = new ArrayList<>();
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Set<String> activeIds = new HashSet<>();
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for (int i = 0; i < T; i++) {
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String id = "torrent-" + i;
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torrentIds.add(id);
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if (i % 2 == 0) {
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activeIds.add(id);
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}
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}
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// Warmup
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for (int w = 0; w < 3; w++) {
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filterDefective(torrentIds, activeIds);
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filterFixed(torrentIds, activeIds);
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}
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// Benchmark defective
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int iters = Math.max(10, 50000 / T);
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long t0 = System.nanoTime();
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for (int i = 0; i < iters; i++) {
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filterDefective(torrentIds, activeIds);
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}
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long defectiveNs = System.nanoTime() - t0;
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// Benchmark fixed
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t0 = System.nanoTime();
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for (int i = 0; i < iters; i++) {
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filterFixed(torrentIds, activeIds);
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}
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long fixedNs = System.nanoTime() - t0;
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double ratio = (double) defectiveNs / fixedNs;
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boolean pass = ratio > 2.0;
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allPass &= pass;
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// Correctness check
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List<String> dResult = filterDefective(torrentIds, activeIds);
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List<String> fResult = filterFixed(torrentIds, activeIds);
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boolean correct = dResult.equals(fResult);
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allPass &= correct;
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System.out.printf("%-8d %12.2f %12.2f %8.1fx %s%s%n",
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T,
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defectiveNs / 1e6 / iters,
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fixedNs / 1e6 / iters,
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ratio,
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pass ? "PASS" : "FAIL",
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correct ? "" : " MISMATCH");
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}
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System.out.println("\nOverall: " + (allPass ? "PASS" : "FAIL"));
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System.exit(allPass ? 0 : 1);
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}
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}
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99
defects/deluge/unit/DelugeTorrentManagerTest.java
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99
defects/deluge/unit/DelugeTorrentManagerTest.java
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/**
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* CWE-407 simulation: Deluge TorrentManager list.index()+pop() inside loop.
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*
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* Simulates get_torrent_list() with the defective O(T^2) list.index()+pop()
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* pattern vs the fixed O(T) list comprehension approach.
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*
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* deluge-0002: torrentmanager list.index()+pop() in loop
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*/
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import java.util.*;
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public class DelugeTorrentManagerTest {
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/** DEFECTIVE: list.index()+pop() inside loop — O(T^2) */
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static List<String> getTorrentListDefective(List<String> allIds, Set<String> ownedIds) {
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List<String> ids = new ArrayList<>(allIds);
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for (String tid : new ArrayList<>(ids)) {
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if (!ownedIds.contains(tid)) {
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int idx = ids.indexOf(tid); // O(N) scan
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if (idx >= 0) {
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ids.remove(idx); // O(N) shift
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}
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}
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}
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return ids;
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}
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/** FIXED: list comprehension — O(T) */
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static List<String> getTorrentListFixed(List<String> allIds, Set<String> ownedIds) {
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List<String> result = new ArrayList<>();
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for (String tid : allIds) {
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if (ownedIds.contains(tid)) {
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result.add(tid);
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}
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}
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return result;
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}
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public static void main(String[] args) {
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int[] sizes = {100, 500, 1000, 2000};
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System.out.println("=== Deluge TorrentManager CWE-407 Test (deluge-0002) ===");
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System.out.printf("%-8s %12s %12s %8s %s%n",
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"T", "Defective(ms)", "Fixed(ms)", "Ratio", "Status");
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boolean allPass = true;
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for (int T : sizes) {
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// Setup: T torrents, 30% owned by current user
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List<String> allIds = new ArrayList<>();
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Set<String> ownedIds = new HashSet<>();
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for (int i = 0; i < T; i++) {
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String id = "torrent-" + i;
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allIds.add(id);
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if (i % 3 == 0) {
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ownedIds.add(id);
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}
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}
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// Warmup
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for (int w = 0; w < 3; w++) {
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getTorrentListDefective(allIds, ownedIds);
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getTorrentListFixed(allIds, ownedIds);
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}
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// Benchmark defective
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int iters = Math.max(10, 50000 / T);
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long t0 = System.nanoTime();
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for (int i = 0; i < iters; i++) {
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getTorrentListDefective(allIds, ownedIds);
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}
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long defectiveNs = System.nanoTime() - t0;
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// Benchmark fixed
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t0 = System.nanoTime();
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for (int i = 0; i < iters; i++) {
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getTorrentListFixed(allIds, ownedIds);
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}
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long fixedNs = System.nanoTime() - t0;
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double ratio = (double) defectiveNs / fixedNs;
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boolean pass = ratio > 2.0;
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allPass &= pass;
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// Correctness check
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List<String> dResult = getTorrentListDefective(allIds, ownedIds);
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List<String> fResult = getTorrentListFixed(allIds, ownedIds);
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boolean correct = dResult.equals(fResult);
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allPass &= correct;
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System.out.printf("%-8d %12.2f %12.2f %8.1fx %s%s%n",
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T,
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defectiveNs / 1e6 / iters,
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fixedNs / 1e6 / iters,
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ratio,
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pass ? "PASS" : "FAIL",
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correct ? "" : " MISMATCH");
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}
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System.out.println("\nOverall: " + (allPass ? "PASS" : "FAIL"));
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System.exit(allPass ? 0 : 1);
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}
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}
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