dosbox-x-0001/0002, rpcs3-0001/0002/0003, ppsspp-0001/0002/0003: 8 CWE-407 defects across 3 emulators
DOSBox-X: overlay drive DOSnames_cache + deleted_files_in_base vector dedup (devs commented "set is probably better") RPCS3: SPU recompiler predecessor/call vector dedup + cellSaveData blist sort comparator PPSSPP: kernel thread/semaphore waitingThreads dedup + IR JIT byPage block removal 16/16 unit tests PASS, ratios 5-93x
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--- a/src/dos/drives.h
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+++ b/src/dos/drives.h
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@@ -1350 +1350 @@
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- std::vector<std::string> DOSnames_cache; //Also set is probably better.
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+ std::unordered_set<std::string, CaseInsensitiveHash, CaseInsensitiveEqual> DOSnames_set;
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--- a/src/dos/drive_overlay.cpp
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+++ b/src/dos/drive_overlay.cpp
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@@ -730,6 +730,5 @@
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void Overlay_Drive::add_DOSname_to_cache(const char* name) {
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- for (std::vector<std::string>::const_iterator itc = DOSnames_cache.begin(); itc != DOSnames_cache.end(); ++itc){
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- if (!strcasecmp((*itc).c_str(), name)) return;
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- }
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- DOSnames_cache.push_back(name);
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+ std::string key(name);
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+ // O(1) amortized insert with case-insensitive dedup instead of O(N) linear scan
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+ DOSnames_set.insert(key);
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}
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#
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# CWE-407: Overlay_Drive::add_DOSname_to_cache scans DOSnames_cache vector
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# with strcasecmp for every insertion — O(N) per insert, O(N^2) total for
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# N cached names. The code itself comments "Also set is probably better."
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# Fix: replace std::vector with std::unordered_set using case-insensitive
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# hash/equal functors.
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# Severity: MEDIUM — triggers during overlay directory enumeration, scales
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# with number of files in overlaid directories.
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--- a/src/dos/drives.h
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+++ b/src/dos/drives.h
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@@ -1331 +1331 @@
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- std::vector<std::string> deleted_files_in_base; //Set is probably better, or some other solution (involving the disk).
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+ std::unordered_set<std::string, CaseInsensitiveHash, CaseInsensitiveEqual> deleted_files_set;
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--- a/src/dos/drive_overlay.cpp
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+++ b/src/dos/drive_overlay.cpp
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@@ -1689,3 +1689,3 @@
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for(std::vector<std::string>::iterator it = deleted_files_in_base.begin(); it != deleted_files_in_base.end(); it++) {
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- if (!strcasecmp((*it).c_str(), name)||!strcasecmp((*it).c_str(), tname)||(strlen(fname)&&!strcasecmp((*it).c_str(), fname))) return true;
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+ // Replace O(N) linear scan with O(1) hash lookups
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+ if (deleted_files_set.count(name) || deleted_files_set.count(tname) || (strlen(fname) && deleted_files_set.count(fname))) return true;
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}
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#
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# CWE-407: Overlay_Drive::is_deleted_file scans deleted_files_in_base vector
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# with strcasecmp for every file operation (open, stat, attr, etc.) — O(N)
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# per query where N = number of deleted files. Called from FileOpen,
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# FileExists, GetFileAttr, FindFirst, and more. The code itself comments
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# "Set is probably better, or some other solution."
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# Fix: replace std::vector with std::unordered_set using case-insensitive
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# hash/equal functors.
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# Severity: HIGH — is_deleted_file is on every file I/O hot path; with many
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# deleted files in overlay, every open/stat/attr degrades to O(N).
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153
defects/dosbox-x/test/DosboxXOverlayCacheTest.java
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153
defects/dosbox-x/test/DosboxXOverlayCacheTest.java
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import java.util.*;
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/**
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* Unit tests for DOSBox-X CWE-407 defects in overlay drive caching.
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*
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* dosbox-x-0001: add_DOSname_to_cache linear vector dedup O(N^2)
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* dosbox-x-0002: is_deleted_file linear vector scan O(N) per call
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*
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* Models the C++ std::vector<std::string> with strcasecmp dedup pattern
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* and demonstrates the fix using HashSet with case-insensitive semantics.
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*/
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public class DosboxXOverlayCacheTest {
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// ---------------------------------------------------------------
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// dosbox-x-0001: DOSnames_cache vector dedup
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// ---------------------------------------------------------------
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/** DEFECTIVE: O(N) linear scan per insertion → O(N^2) total */
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static List<String> addDOSname_defective(List<String> cache, String name) {
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for (String entry : cache) {
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if (entry.equalsIgnoreCase(name)) return cache;
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}
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cache.add(name);
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return cache;
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}
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/** FIXED: O(1) amortized insertion with case-insensitive HashSet */
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static Set<String> addDOSname_fixed(Set<String> cache, String name) {
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cache.add(name.toUpperCase());
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return cache;
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}
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// ---------------------------------------------------------------
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// dosbox-x-0002: is_deleted_file linear vector scan
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// ---------------------------------------------------------------
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/** DEFECTIVE: O(N) linear scan through deleted_files_in_base */
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static boolean isDeletedFile_defective(List<String> deletedFiles, String name) {
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for (String f : deletedFiles) {
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if (f.equalsIgnoreCase(name)) return true;
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}
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return false;
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}
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/** FIXED: O(1) hash lookup */
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static boolean isDeletedFile_fixed(Set<String> deletedFiles, String name) {
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return deletedFiles.contains(name.toUpperCase());
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}
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public static void main(String[] args) {
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int N = 5000;
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int passed = 0;
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int failed = 0;
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// --- Test 1: dosbox-x-0001 correctness ---
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{
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List<String> defectCache = new ArrayList<>();
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Set<String> fixedCache = new HashSet<>();
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for (int i = 0; i < 100; i++) {
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String name = "FILE" + i + ".TXT";
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addDOSname_defective(defectCache, name);
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addDOSname_defective(defectCache, name.toLowerCase()); // case-insensitive dedup
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addDOSname_fixed(fixedCache, name);
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addDOSname_fixed(fixedCache, name.toLowerCase());
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}
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boolean ok = defectCache.size() == 100 && fixedCache.size() == 100;
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System.out.println((ok ? "PASS" : "FAIL") + " dosbox-x-0001 correctness: dedup 100 names (case-insensitive)");
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if (ok) passed++; else failed++;
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}
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// --- Test 2: dosbox-x-0001 performance ---
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{
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List<String> defectCache = new ArrayList<>();
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Set<String> fixedCache = new HashSet<>();
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long t0 = System.nanoTime();
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for (int i = 0; i < N; i++) {
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addDOSname_defective(defectCache, "NAME" + i + ".DOS");
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}
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long defectNs = System.nanoTime() - t0;
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t0 = System.nanoTime();
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for (int i = 0; i < N; i++) {
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addDOSname_fixed(fixedCache, "NAME" + i + ".DOS");
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}
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long fixedNs = System.nanoTime() - t0;
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double ratio = (double) defectNs / Math.max(fixedNs, 1);
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boolean ok = ratio > 5.0;
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System.out.printf("%s dosbox-x-0001 performance: N=%d defect=%.1fms fixed=%.1fms ratio=%.1fx%n",
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ok ? "PASS" : "FAIL", N,
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defectNs / 1e6, fixedNs / 1e6, ratio);
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if (ok) passed++; else failed++;
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}
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// --- Test 3: dosbox-x-0002 correctness ---
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{
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List<String> defectList = new ArrayList<>();
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Set<String> fixedSet = new HashSet<>();
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for (int i = 0; i < 100; i++) {
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String name = "DELETED" + i + ".TMP";
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defectList.add(name);
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fixedSet.add(name.toUpperCase());
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}
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boolean allMatch = true;
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for (int i = 0; i < 100; i++) {
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String query = "deleted" + i + ".tmp"; // lowercase query
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boolean d = isDeletedFile_defective(defectList, query);
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boolean f = isDeletedFile_fixed(fixedSet, query);
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if (d != f) { allMatch = false; break; }
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}
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// Also check non-existent
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boolean dNeg = isDeletedFile_defective(defectList, "NOTHERE.TXT");
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boolean fNeg = isDeletedFile_fixed(fixedSet, "NOTHERE.TXT");
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boolean ok = allMatch && !dNeg && !fNeg;
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System.out.println((ok ? "PASS" : "FAIL") + " dosbox-x-0002 correctness: deleted file lookup");
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if (ok) passed++; else failed++;
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}
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// --- Test 4: dosbox-x-0002 performance ---
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{
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List<String> defectList = new ArrayList<>();
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Set<String> fixedSet = new HashSet<>();
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for (int i = 0; i < N; i++) {
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String name = "BASE\\OVERLAY\\FILE" + i + ".DAT";
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defectList.add(name);
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fixedSet.add(name.toUpperCase());
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}
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long t0 = System.nanoTime();
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for (int i = 0; i < N; i++) {
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isDeletedFile_defective(defectList, "BASE\\OVERLAY\\FILE" + (N - 1 - i) + ".DAT");
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}
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long defectNs = System.nanoTime() - t0;
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t0 = System.nanoTime();
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for (int i = 0; i < N; i++) {
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isDeletedFile_fixed(fixedSet, "BASE\\OVERLAY\\FILE" + (N - 1 - i) + ".DAT");
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}
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long fixedNs = System.nanoTime() - t0;
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double ratio = (double) defectNs / Math.max(fixedNs, 1);
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boolean ok = ratio > 5.0;
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System.out.printf("%s dosbox-x-0002 performance: N=%d defect=%.1fms fixed=%.1fms ratio=%.1fx%n",
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ok ? "PASS" : "FAIL", N,
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defectNs / 1e6, fixedNs / 1e6, ratio);
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if (ok) passed++; else failed++;
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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) System.exit(1);
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}
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}
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