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8247444: Trust final fields in records

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Co-authored-by: Christoph Dreis <christoph.dreis@freenet.de>
Reviewed-by: jrose, dholmes, forax, coleenp, vlivanov
This commit is contained in:
Mandy Chung 2020-06-19 08:27:59 -07:00
parent 983e012c9f
commit f2b191a6e9
26 changed files with 227 additions and 49 deletions
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7
src/java.base/share/classes/java/lang/invoke/MemberName.java
View file

@ -1,5 +1,5 @@
/*
* Copyright (c) 2008, 2019, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 2008, 2020, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
@ -480,7 +480,8 @@ final class MemberName implements Member, Cloneable {
IS_CONSTRUCTOR = MN_IS_CONSTRUCTOR, // constructor
IS_FIELD = MN_IS_FIELD, // field
IS_TYPE = MN_IS_TYPE, // nested type
CALLER_SENSITIVE = MN_CALLER_SENSITIVE; // @CallerSensitive annotation detected
CALLER_SENSITIVE = MN_CALLER_SENSITIVE, // @CallerSensitive annotation detected
TRUSTED_FINAL = MN_TRUSTED_FINAL; // trusted final field
static final int ALL_ACCESS = Modifier.PUBLIC | Modifier.PRIVATE | Modifier.PROTECTED;
static final int ALL_KINDS = IS_METHOD | IS_CONSTRUCTOR | IS_FIELD | IS_TYPE;
@ -520,6 +521,8 @@ final class MemberName implements Member, Cloneable {
public boolean isCallerSensitive() {
return testAllFlags(CALLER_SENSITIVE);
}
/** Query whether this member is a trusted final field. */
public boolean isTrustedFinalField() { return testAllFlags(TRUSTED_FINAL|IS_FIELD); }
/** Utility method to query whether this member is accessible from a given lookup class. */
public boolean isAccessibleFrom(Class<?> lookupClass) {

1
src/java.base/share/classes/java/lang/invoke/MethodHandleNatives.java
View file

@ -118,6 +118,7 @@ class MethodHandleNatives {
MN_IS_FIELD = 0x00040000, // field
MN_IS_TYPE = 0x00080000, // nested type
MN_CALLER_SENSITIVE = 0x00100000, // @CallerSensitive annotation detected
MN_TRUSTED_FINAL = 0x00200000, // trusted final field
MN_REFERENCE_KIND_SHIFT = 24, // refKind
MN_REFERENCE_KIND_MASK = 0x0F000000 >> MN_REFERENCE_KIND_SHIFT,
// The SEARCH_* bits are not for MN.flags but for the matchFlags argument of MHN.getMembers:

10
src/java.base/share/classes/java/lang/invoke/MethodHandles.java
View file

@ -3273,10 +3273,10 @@ return mh1;
private MethodHandle unreflectField(Field f, boolean isSetter) throws IllegalAccessException {
MemberName field = new MemberName(f, isSetter);
if (isSetter && field.isFinal()) {
if (field.isStatic()) {
throw field.makeAccessException("static final field has no write access", this);
} else if (field.getDeclaringClass().isHidden()){
throw field.makeAccessException("final field in a hidden class has no write access", this);
if (field.isTrustedFinalField()) {
String msg = field.isStatic() ? "static final field has no write access"
: "final field has no write access";
throw field.makeAccessException(msg, this);
}
}
assert(isSetter
@ -3839,7 +3839,7 @@ return mh1;
refc = lookupClass();
}
return VarHandles.makeFieldHandle(getField, refc, getField.getFieldType(),
this.allowedModes == TRUSTED && !getField.getDeclaringClass().isHidden());
this.allowedModes == TRUSTED && !getField.isTrustedFinalField());
}
/** Check access and get the requested constructor. */
private MethodHandle getDirectConstructor(Class<?> refc, MemberName ctor) throws IllegalAccessException {