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8280377: MethodHandleProxies does not correctly invoke default methods with varags

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Reviewed-by: alanb
This commit is contained in:
Mandy Chung 2022-01-26 01:24:15 +00:00
parent 2eab86b513
commit a183bfb436
12 changed files with 295 additions and 66 deletions
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43
src/java.base/share/classes/java/lang/invoke/MethodHandleProxies.java
View file

@ -28,9 +28,11 @@ package java.lang.invoke;
import java.lang.reflect.*;
import java.security.AccessController;
import java.security.PrivilegedAction;
import jdk.internal.access.JavaLangReflectAccess;
import jdk.internal.access.SharedSecrets;
import sun.invoke.WrapperInstance;
import java.util.ArrayList;
import java.util.concurrent.ConcurrentHashMap;
import jdk.internal.reflect.CallerSensitive;
import jdk.internal.reflect.Reflection;
@ -184,8 +186,6 @@ public class MethodHandleProxies {
checkTarget = checkTarget.asType(checkTarget.type().changeReturnType(Object.class));
vaTargets[i] = checkTarget.asSpreader(Object[].class, smMT.parameterCount());
}
final ConcurrentHashMap<Method, MethodHandle> defaultMethodMap =
hasDefaultMethods(intfc) ? new ConcurrentHashMap<>() : null;
final InvocationHandler ih = new InvocationHandler() {
private Object getArg(String name) {
if ((Object)name == "getWrapperInstanceTarget") return target;
@ -202,7 +202,8 @@ public class MethodHandleProxies {
if (isObjectMethod(method))
return callObjectMethod(proxy, method, args);
if (isDefaultMethod(method)) {
return callDefaultMethod(defaultMethodMap, proxy, intfc, method, args);
// no additional access check is performed
return JLRA.invokeDefault(proxy, method, args, null);
}
throw newInternalError("bad proxy method: "+method);
}
@ -320,37 +321,5 @@ public class MethodHandleProxies {
return !Modifier.isAbstract(m.getModifiers());
}
private static boolean hasDefaultMethods(Class<?> intfc) {
for (Method m : intfc.getMethods()) {
if (!isObjectMethod(m) &&
!Modifier.isAbstract(m.getModifiers())) {
return true;
}
}
return false;
}
private static Object callDefaultMethod(ConcurrentHashMap<Method, MethodHandle> defaultMethodMap,
Object self, Class<?> intfc, Method m, Object[] args) throws Throwable {
assert(isDefaultMethod(m) && !isObjectMethod(m)) : m;
// Lazily compute the associated method handle from the method
MethodHandle dmh = defaultMethodMap.computeIfAbsent(m, mk -> {
try {
// Look up the default method for special invocation thereby
// avoiding recursive invocation back to the proxy
MethodHandle mh = MethodHandles.Lookup.IMPL_LOOKUP.findSpecial(
intfc, mk.getName(),
MethodType.methodType(mk.getReturnType(), mk.getParameterTypes()),
self.getClass());
return mh.asSpreader(Object[].class, mk.getParameterCount());
} catch (NoSuchMethodException | IllegalAccessException e) {
// The method is known to exist and should be accessible, this
// method would not be called unless the invokeinterface to the
// default (public) method passed access control checks
throw new InternalError(e);
}
});
return dmh.invoke(self, args);
}
private static final JavaLangReflectAccess JLRA = SharedSecrets.getJavaLangReflectAccess();
}

30
src/java.base/share/classes/java/lang/reflect/InvocationHandler.java
View file

@ -28,7 +28,6 @@ package java.lang.reflect;
import jdk.internal.reflect.CallerSensitive;
import jdk.internal.reflect.Reflection;
import java.lang.invoke.MethodHandle;
import java.util.Objects;
/**
@ -262,33 +261,6 @@ public interface InvocationHandler {
throws Throwable {
Objects.requireNonNull(proxy);
Objects.requireNonNull(method);
// verify that the object is actually a proxy instance
if (!Proxy.isProxyClass(proxy.getClass())) {
throw new IllegalArgumentException("'proxy' is not a proxy instance");
}
if (!method.isDefault()) {
throw new IllegalArgumentException("\"" + method + "\" is not a default method");
}
@SuppressWarnings("unchecked")
Class<? extends Proxy> proxyClass = (Class<? extends Proxy>)proxy.getClass();
Class<?> intf = method.getDeclaringClass();
// access check on the default method
method.checkAccess(Reflection.getCallerClass(), intf, proxyClass, method.getModifiers());
MethodHandle mh = Proxy.defaultMethodHandle(proxyClass, method);
// invoke the super method
try {
// the args array can be null if the number of formal parameters required by
// the method is zero (consistent with Method::invoke)
Object[] params = args != null ? args : Proxy.EMPTY_ARGS;
return mh.invokeExact(proxy, params);
} catch (ClassCastException | NullPointerException e) {
throw new IllegalArgumentException(e.getMessage(), e);
} catch (Proxy.InvocationException e) {
// unwrap and throw the exception thrown by the default method
throw e.getCause();
}
return Proxy.invokeDefault(proxy, method, args, Reflection.getCallerClass());
}
}

40
src/java.base/share/classes/java/lang/reflect/Proxy.java
View file

@ -1314,6 +1314,46 @@ public class Proxy implements java.io.Serializable {
});
}
/*
* Invoke the default method of the given proxy with an explicit caller class.
*
* @throws IllegalAccessException if the proxy interface is inaccessible to the caller
* if caller is non-null
*/
static Object invokeDefault(Object proxy, Method method, Object[] args, Class<?> caller)
throws Throwable {
// verify that the object is actually a proxy instance
if (!Proxy.isProxyClass(proxy.getClass())) {
throw new IllegalArgumentException("'proxy' is not a proxy instance");
}
if (!method.isDefault()) {
throw new IllegalArgumentException("\"" + method + "\" is not a default method");
}
@SuppressWarnings("unchecked")
Class<? extends Proxy> proxyClass = (Class<? extends Proxy>)proxy.getClass();
// skip access check if caller is null
if (caller != null) {
Class<?> intf = method.getDeclaringClass();
// access check on the default method
method.checkAccess(caller, intf, proxyClass, method.getModifiers());
}
MethodHandle mh = Proxy.defaultMethodHandle(proxyClass, method);
// invoke the super method
try {
// the args array can be null if the number of formal parameters required by
// the method is zero (consistent with Method::invoke)
Object[] params = args != null ? args : Proxy.EMPTY_ARGS;
return mh.invokeExact(proxy, params);
} catch (ClassCastException | NullPointerException e) {
throw new IllegalArgumentException(e.getMessage(), e);
} catch (Proxy.InvocationException e) {
// unwrap and throw the exception thrown by the default method
throw e.getCause();
}
}
/**
* Internal exception type to wrap the exception thrown by the default method
* so that it can distinguish CCE and NPE thrown due to the arguments

5
src/java.base/share/classes/java/lang/reflect/ReflectAccess.java
View file

@ -127,4 +127,9 @@ class ReflectAccess implements jdk.internal.access.JavaLangReflectAccess {
{
return ctor.newInstanceWithCaller(args, true, caller);
}
public Object invokeDefault(Object proxy, Method method, Object[] args, Class<?> caller)
throws Throwable {
return Proxy.invokeDefault(proxy, method, args, caller);
}
}