93 lines
2.9 KiB
Diff
93 lines
2.9 KiB
Diff
# HG changeset patch
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# User stuefe
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# Date 1497865921 -7200
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# Mon Jun 19 11:52:01 2017 +0200
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# Node ID ca0c7b2783e0102468218589a062e7ac4736aae2
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# Parent 148a7d6c463ad1726bad8a9e8d5df191314d704b
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8181419, PR3413, RH1463144: Race in jdwp invoker handling may lead to crashes or invalid results
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Reviewed-by: sspitsyn, sgehwolf, clanger
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diff --git a/src/share/back/invoker.c b/src/share/back/invoker.c
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--- openjdk/jdk/src/share/back/invoker.c
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+++ openjdk/jdk/src/share/back/invoker.c
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@@ -212,30 +212,6 @@
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}
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/*
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- * Delete saved global references - if any - for:
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- * - a potentially thrown Exception
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- * - a returned refernce/array value
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- * See invoker_doInvoke() and invoke* methods where global references
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- * are being saved.
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- */
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-static void
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-deletePotentiallySavedGlobalRefs(JNIEnv *env, InvokeRequest *request)
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-{
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- /* Delete potentially saved return value */
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- if ((request->invokeType == INVOKE_CONSTRUCTOR) ||
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- (returnTypeTag(request->methodSignature) == JDWP_TAG(OBJECT)) ||
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- (returnTypeTag(request->methodSignature) == JDWP_TAG(ARRAY))) {
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- if (request->returnValue.l != NULL) {
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- tossGlobalRef(env, &(request->returnValue.l));
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- }
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- }
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- /* Delete potentially saved exception */
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- if (request->exception != NULL) {
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- tossGlobalRef(env, &(request->exception));
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- }
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-}
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-
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-/*
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* Delete global argument references from the request which got put there before a
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* invoke request was carried out. See fillInvokeRequest().
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*/
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@@ -744,6 +720,7 @@
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jint id;
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InvokeRequest *request;
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jboolean detached;
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+ jboolean mustReleaseReturnValue = JNI_FALSE;
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JDI_ASSERT(thread);
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@@ -787,6 +764,13 @@
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id = request->id;
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exc = request->exception;
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returnValue = request->returnValue;
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+
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+ /* Release return value and exception references, but delay the release
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+ * until after the return packet was sent. */
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+ mustReleaseReturnValue = request->invokeType == INVOKE_CONSTRUCTOR ||
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+ returnTypeTag(request->methodSignature) == JDWP_TAG(OBJECT) ||
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+ returnTypeTag(request->methodSignature) == JDWP_TAG(ARRAY);
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+
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}
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/*
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@@ -801,6 +785,12 @@
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*/
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deleteGlobalArgumentRefs(env, request);
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+ /* From now on, do not access the request structure anymore
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+ * for this request id, because once we give up the invokerLock it may
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+ * be immediately reused by a new invoke request.
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+ */
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+ request = NULL;
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+
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/*
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* Give up the lock before I/O operation
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*/
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@@ -821,7 +811,12 @@
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*/
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eventHandler_lock(); // for proper lock order
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debugMonitorEnter(invokerLock);
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- deletePotentiallySavedGlobalRefs(env, request);
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+ if (mustReleaseReturnValue && returnValue.l != NULL) {
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+ tossGlobalRef(env, &returnValue.l);
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+ }
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+ if (exc != NULL) {
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+ tossGlobalRef(env, &exc);
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+ }
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debugMonitorExit(invokerLock);
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eventHandler_unlock();
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}
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