Part 3.6: Is policy list subsumed under subsuming policy?

third_party/WebKit/Source/core/frame/csp/SourceListDirective.cpp

Index: third_party/WebKit/Source/core/frame/csp/SourceListDirective.cpp
diff --git a/third_party/WebKit/Source/core/frame/csp/SourceListDirective.cpp b/third_party/WebKit/Source/core/frame/csp/SourceListDirective.cpp
index 49ae246d0370fc6aeb24bd68aef1d7061c28d1b2..32d80712d5b24e88c3d1778f59421fb6ab4dccc5 100644
--- a/third_party/WebKit/Source/core/frame/csp/SourceListDirective.cpp
+++ b/third_party/WebKit/Source/core/frame/csp/SourceListDirective.cpp
@@ -618,6 +618,8 @@ bool SourceListDirective::subsumes(
   bool allowDynamicOther = other[0]->m_allowDynamic;
   bool allowHashedAttributesOther = other[0]->m_allowHashedAttributes;
   bool isHashOrNoncePresentOther = other[0]->isHashOrNoncePresent();
+  HashSet<String> noncesB = other[0]->m_nonces;
+  HashSet<CSPHashValue> hashesB = other[0]->m_hashes;
 
   for (size_t i = 1; i < other.size(); i++) {
     allowInlineOther = allowInlineOther && other[i]->m_allowInline;
@@ -627,9 +629,14 @@ bool SourceListDirective::subsumes(
         allowHashedAttributesOther && other[i]->m_allowHashedAttributes;
     isHashOrNoncePresentOther =
         isHashOrNoncePresentOther && other[i]->isHashOrNoncePresent();
+    noncesB = other[i]->getIntersectNonces(noncesB);
+    hashesB = other[i]->getIntersectHashes(hashesB);
     normalizedB = other[i]->getIntersectCSPSources(normalizedB);
   }
 
+  if (!subsumesNoncesAndHashes(noncesB, hashesB))
+    return false;
+
   const ContentSecurityPolicy::DirectiveType type =
       ContentSecurityPolicy::getDirectiveType(m_directiveName);
   if (type == ContentSecurityPolicy::DirectiveType::ScriptSrc ||
@@ -649,6 +656,49 @@ bool SourceListDirective::subsumes(
   return CSPSource::firstSubsumesSecond(normalizedA, normalizedB);
 }
 
+bool SourceListDirective::subsumesNoncesAndHashes(
+    const HashSet<String>& nonces,
+    const HashSet<CSPHashValue> hashes) const {
+  for (const auto& nonce : nonces) {
+    if (!m_nonces.contains(nonce))
+      return false;
+  }
+  for (const auto& hash : hashes) {
+    if (!m_hashes.contains(hash))
+      return false;
+  }
+
+  return true;
+}
+
+HashSet<String> SourceListDirective::getIntersectNonces(
+    const HashSet<String>& other) const {
+  if (!m_nonces.size() || !other.size())
+    return !m_nonces.size() ? m_nonces : other;
+
+  HashSet<String> normalized;
+  for (const auto& nonce : m_nonces) {
+    if (other.contains(nonce))
+      normalized.add(nonce);
+  }
+
+  return normalized;
+}
+
+HashSet<CSPHashValue> SourceListDirective::getIntersectHashes(
+    const HashSet<CSPHashValue>& other) const {
+  if (!m_hashes.size() || !other.size())
+    return !m_hashes.size() ? m_hashes : other;
+
+  HashSet<CSPHashValue> normalized;
+  for (const auto& hash : m_hashes) {
+    if (other.contains(hash))
+      normalized.add(hash);
+  }
+
+  return normalized;
+}
+
 HeapHashMap<String, Member<CSPSource>>
 SourceListDirective::getIntersectSchemesOnly(
     const HeapVector<Member<CSPSource>>& other) const {