/* * Copyright (c) 2003, 2025, 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 * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation. * * This code is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. * */ #include "cds/cdsConfig.hpp" #include "classfile/symbolTable.hpp" #include "classfile/systemDictionary.hpp" #include "classfile/systemDictionaryShared.hpp" #include "classfile/verificationType.hpp" #include "classfile/verifier.hpp" #include "classfile/vmClasses.hpp" #include "classfile/vmSymbols.hpp" #include "logging/log.hpp" #include "oops/klass.inline.hpp" #include "runtime/handles.inline.hpp" VerificationType VerificationType::from_tag(u1 tag) { switch (tag) { case ITEM_Top: return bogus_type(); case ITEM_Integer: return integer_type(); case ITEM_Float: return float_type(); case ITEM_Double: return double_type(); case ITEM_Long: return long_type(); case ITEM_Null: return null_type(); default: ShouldNotReachHere(); return bogus_type(); } } // Potentially resolve the target class and from class, and check whether the from class is assignable // to the target class. The current_klass is the class being verified - it could also be the target in some // cases, and otherwise is needed to obtain the correct classloader for resolving the other classes. bool VerificationType::resolve_and_check_assignability(InstanceKlass* current_klass, Symbol* target_name, Symbol* from_name, bool from_field_is_protected, bool from_is_array, bool from_is_object, bool* target_is_interface, TRAPS) { HandleMark hm(THREAD); Klass* target_klass; if (current_klass->is_hidden() && current_klass->name() == target_name) { target_klass = current_klass; } else { target_klass = SystemDictionary::resolve_or_fail( target_name, Handle(THREAD, current_klass->class_loader()), true, CHECK_false); if (log_is_enabled(Debug, class, resolve)) { Verifier::trace_class_resolution(target_klass, current_klass); } } bool is_intf = target_klass->is_interface(); if (target_is_interface != nullptr) { *target_is_interface = is_intf; } if (is_intf && (!from_field_is_protected || from_name != vmSymbols::java_lang_Object())) { // If we are not trying to access a protected field or method in // java.lang.Object then, for arrays, we only allow assignability // to interfaces java.lang.Cloneable and java.io.Serializable. // Otherwise, we treat interfaces as java.lang.Object. return !from_is_array || target_klass == vmClasses::Cloneable_klass() || target_klass == vmClasses::Serializable_klass(); } else if (from_is_object) { Klass* from_klass; if (current_klass->is_hidden() && current_klass->name() == from_name) { from_klass = current_klass; } else { from_klass = SystemDictionary::resolve_or_fail( from_name, Handle(THREAD, current_klass->class_loader()), true, CHECK_false); if (log_is_enabled(Debug, class, resolve)) { Verifier::trace_class_resolution(from_klass, current_klass); } } return from_klass->is_subclass_of(target_klass); } return false; } bool VerificationType::is_reference_assignable_from( const VerificationType& from, ClassVerifier* context, bool from_field_is_protected, bool* this_is_interface, TRAPS) const { if (from.is_null()) { // null is assignable to any reference return true; } else if (is_null()) { return false; } else if (name() == from.name()) { return true; } else if (is_object()) { // We need check the class hierarchy to check assignability if (name() == vmSymbols::java_lang_Object()) { // any object or array is assignable to java.lang.Object return true; } #if INCLUDE_CDS if (CDSConfig::is_dumping_archive()) { bool skip_assignability_check = false; SystemDictionaryShared::add_verification_constraint(context->current_class(), name(), from.name(), from_field_is_protected, from.is_array(), from.is_object(), &skip_assignability_check); if (skip_assignability_check) { // We are not able to resolve name() or from.name(). The actual assignability check // will be delayed until runtime. return true; } } #endif return resolve_and_check_assignability(context->current_class(), name(), from.name(), from_field_is_protected, from.is_array(), from.is_object(), this_is_interface, THREAD); } else if (is_array() && from.is_array()) { VerificationType comp_this = get_component(context); VerificationType comp_from = from.get_component(context); if (!comp_this.is_bogus() && !comp_from.is_bogus()) { return comp_this.is_component_assignable_from(comp_from, context, from_field_is_protected, THREAD); } } return false; } VerificationType VerificationType::get_component(ClassVerifier *context) const { assert(is_array() && name()->utf8_length() >= 2, "Must be a valid array"); SignatureStream ss(name(), false); ss.skip_array_prefix(1); switch (ss.type()) { case T_BOOLEAN: return VerificationType(Boolean); case T_BYTE: return VerificationType(Byte); case T_CHAR: return VerificationType(Char); case T_SHORT: return VerificationType(Short); case T_INT: return VerificationType(Integer); case T_LONG: return VerificationType(Long); case T_FLOAT: return VerificationType(Float); case T_DOUBLE: return VerificationType(Double); case T_ARRAY: case T_OBJECT: { guarantee(ss.is_reference(), "unchecked verifier input?"); Symbol* component = ss.as_symbol(); // Create another symbol to save as signature stream unreferences this symbol. Symbol* component_copy = context->create_temporary_symbol(component); assert(component_copy == component, "symbols don't match"); return VerificationType::reference_type(component_copy); } default: // Met an invalid type signature, e.g. [X return VerificationType::bogus_type(); } } void VerificationType::print_on(outputStream* st) const { switch (_u._data) { case Bogus: st->print("top"); break; case Category1: st->print("category1"); break; case Category2: st->print("category2"); break; case Category2_2nd: st->print("category2_2nd"); break; case Boolean: st->print("boolean"); break; case Byte: st->print("byte"); break; case Short: st->print("short"); break; case Char: st->print("char"); break; case Integer: st->print("integer"); break; case Float: st->print("float"); break; case Long: st->print("long"); break; case Double: st->print("double"); break; case Long_2nd: st->print("long_2nd"); break; case Double_2nd: st->print("double_2nd"); break; case Null: st->print("null"); break; case ReferenceQuery: st->print("reference type"); break; case Category1Query: st->print("category1 type"); break; case Category2Query: st->print("category2 type"); break; case Category2_2ndQuery: st->print("category2_2nd type"); break; default: if (is_uninitialized_this()) { st->print("uninitializedThis"); } else if (is_uninitialized()) { st->print("uninitialized %d", bci()); } else { if (name() != nullptr) { name()->print_value_on(st); } else { st->print_cr("null"); } } } }