Bug 754202 - Remove mContextPrincipal usage from within nsScriptSecurityManager. r=mrbkap

caps/include/nsScriptSecurityManager.h

@@ -553,17 +553,6 @@ private:
     PrintPolicyDB();
 #endif
 
-    struct ContextPrincipal {
-        ContextPrincipal(ContextPrincipal *next, JSContext *cx,
-                         JSStackFrame *fp, nsIPrincipal *principal)
-            : mNext(next), mCx(cx), mFp(fp), mPrincipal(principal) {}
-
-        ContextPrincipal *mNext;
-        JSContext *mCx;
-        JSStackFrame *mFp;
-        nsCOMPtr<nsIPrincipal> mPrincipal;
-    };
-
     // JS strings we need to clean up on shutdown
     static jsid sEnabledID;
 
@@ -576,7 +565,6 @@ private:
 
     nsCOMPtr<nsIPrincipal> mSystemPrincipal;
     nsCOMPtr<nsIPrincipal> mSystemCertificate;
-    ContextPrincipal *mContextPrincipals;
     nsInterfaceHashtable<PrincipalKey, nsIPrincipal> mPrincipals;
     bool mPrefInitialized;
     bool mIsJavaScriptEnabled;

caps/src/nsScriptSecurityManager.cpp

@@ -2222,24 +2222,10 @@ nsScriptSecurityManager::GetPrincipalAndFrame(JSContext *cx,
 
     if (cx)
     {
-        JSStackFrame *target = nsnull;
-        nsIPrincipal *targetPrincipal = nsnull;
-        for (ContextPrincipal *cp = mContextPrincipals; cp; cp = cp->mNext)
-        {
-            if (cp->mCx == cx)
-            {
-                target = cp->mFp;
-                targetPrincipal = cp->mPrincipal;
-                break;
-            }
-        }
-
         // Get principals from innermost JavaScript frame.
         JSStackFrame *fp = nsnull; // tell JS_FrameIterator to start at innermost
         for (fp = JS_FrameIterator(cx, &fp); fp; fp = JS_FrameIterator(cx, &fp))
         {
-            if (fp == target)
-                break;
             nsIPrincipal* result = GetFramePrincipal(cx, fp, rv);
             if (result)
             {
@@ -2249,25 +2235,6 @@ nsScriptSecurityManager::GetPrincipalAndFrame(JSContext *cx,
             }
         }
 
-        // If targetPrincipal is non-null, then it means that someone wants to
-        // clamp the principals on this context to this principal. Note that
-        // fp might not equal target here (fp might be null) because someone
-        // could have set aside the frame chain in the meantime.
-        if (targetPrincipal)
-        {
-            if (fp && fp == target)
-            {
-                *frameResult = fp;
-            }
-            else
-            {
-                JSStackFrame *inner = nsnull;
-                *frameResult = JS_FrameIterator(cx, &inner);
-            }
-
-            return targetPrincipal;
-        }
-
         nsIScriptContextPrincipal* scp =
             GetScriptContextPrincipalFromJSContext(cx);
         if (scp)
@@ -2452,27 +2419,11 @@ nsScriptSecurityManager::IsCapabilityEnabled(const char *capability,
     JSContext *cx = GetCurrentJSContext();
     fp = cx ? JS_FrameIterator(cx, &fp) : nsnull;
 
-    JSStackFrame *target = nsnull;
-    nsIPrincipal *targetPrincipal = nsnull;
-    for (ContextPrincipal *cp = mContextPrincipals; cp; cp = cp->mNext)
-    {
-        if (cp->mCx == cx)
-        {
-            target = cp->mFp;
-            targetPrincipal = cp->mPrincipal;
-            break;
-        }
-    }
-
     if (!fp)
     {
-        // No script code on stack. If we had a principal pushed for this
-        // context and fp is null, then we use that principal. Otherwise, we
-        // don't have enough information and have to allow execution.
-
-        *result = (targetPrincipal && !target)
-                  ? (targetPrincipal == mSystemPrincipal)
-                  : true;
+        // No script code on stack. We don't have enough information and have
+        // to allow execution.
+        *result = true;
 
         return NS_OK;
     }
@@ -2516,7 +2467,7 @@ nsScriptSecurityManager::IsCapabilityEnabled(const char *capability,
         // the JS engine via JS_EvaluateScript or similar APIs.
         if (JS_IsGlobalFrame(cx, fp))
             break;
-    } while (fp != target && (fp = JS_FrameIterator(cx, &fp)) != nsnull);
+    } while ((fp = JS_FrameIterator(cx, &fp)) != nsnull);
 
     if (!previousPrincipal)
     {
@@ -3000,7 +2951,6 @@ nsScriptSecurityManager::nsScriptSecurityManager(void)
     : mOriginToPolicyMap(nsnull),
       mDefaultPolicy(nsnull),
       mCapabilities(nsnull),
-      mContextPrincipals(nsnull),
       mPrefInitialized(false),
       mIsJavaScriptEnabled(false),
       mIsWritingPrefs(false),
@@ -3080,7 +3030,6 @@ jsid nsScriptSecurityManager::sEnabledID   = JSID_VOID;
 nsScriptSecurityManager::~nsScriptSecurityManager(void)
 {
     Preferences::RemoveObservers(this, kObservedPrefs);
-    NS_ASSERTION(!mContextPrincipals, "Leaking mContextPrincipals");
     delete mOriginToPolicyMap;
     if(mDefaultPolicy)
         mDefaultPolicy->Drop();