| /* |
| * Copyright (c) 1998, 2017, 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. |
| * |
| */ |
| |
| #ifndef SHARE_VM_CLASSFILE_VERIFIER_HPP |
| #define SHARE_VM_CLASSFILE_VERIFIER_HPP |
| |
| #include "classfile/verificationType.hpp" |
| #include "gc/shared/gcLocker.hpp" |
| #include "oops/klass.hpp" |
| #include "oops/method.hpp" |
| #include "runtime/handles.hpp" |
| #include "utilities/exceptions.hpp" |
| #include "utilities/growableArray.hpp" |
| |
| // The verifier class |
| class Verifier : AllStatic { |
| public: |
| enum { |
| STRICTER_ACCESS_CTRL_CHECK_VERSION = 49, |
| STACKMAP_ATTRIBUTE_MAJOR_VERSION = 50, |
| INVOKEDYNAMIC_MAJOR_VERSION = 51, |
| NO_RELAX_ACCESS_CTRL_CHECK_VERSION = 52 |
| }; |
| typedef enum { ThrowException, NoException } Mode; |
| |
| /** |
| * Verify the bytecodes for a class. If 'throw_exception' is true |
| * then the appropriate VerifyError or ClassFormatError will be thrown. |
| * Otherwise, no exception is thrown and the return indicates the |
| * error. |
| */ |
| static void log_end_verification(outputStream* st, const char* klassName, Symbol* exception_name, TRAPS); |
| static bool verify(InstanceKlass* klass, Mode mode, bool should_verify_class, TRAPS); |
| |
| // Return false if the class is loaded by the bootstrap loader, |
| // or if defineClass was called requesting skipping verification |
| // -Xverify:all/none override this value |
| static bool should_verify_for(oop class_loader, bool should_verify_class); |
| |
| // Relax certain access checks to enable some broken 1.1 apps to run on 1.2. |
| static bool relax_access_for(oop class_loader); |
| |
| // Print output for class+resolve |
| static void trace_class_resolution(Klass* resolve_class, InstanceKlass* verify_class); |
| |
| private: |
| static bool is_eligible_for_verification(InstanceKlass* klass, bool should_verify_class); |
| static Symbol* inference_verify( |
| InstanceKlass* klass, char* msg, size_t msg_len, TRAPS); |
| }; |
| |
| class RawBytecodeStream; |
| class StackMapFrame; |
| class StackMapTable; |
| |
| // Summary of verifier's memory usage: |
| // StackMapTable is stack allocated. |
| // StackMapFrame are resource allocated. There is only one ResourceMark |
| // for each class verification, which is created at the top level. |
| // There is one mutable StackMapFrame (current_frame) which is updated |
| // by abstract bytecode interpretation. frame_in_exception_handler() returns |
| // a frame that has a mutable one-item stack (ready for pushing the |
| // catch type exception object). All the other StackMapFrame's |
| // are immutable (including their locals and stack arrays) after |
| // their constructions. |
| // locals/stack arrays in StackMapFrame are resource allocated. |
| // locals/stack arrays can be shared between StackMapFrame's, except |
| // the mutable StackMapFrame (current_frame). |
| |
| // These macros are used similarly to CHECK macros but also check |
| // the status of the verifier and return if that has an error. |
| #define CHECK_VERIFY(verifier) \ |
| CHECK); if ((verifier)->has_error()) return; ((void)0 |
| #define CHECK_VERIFY_(verifier, result) \ |
| CHECK_(result)); if ((verifier)->has_error()) return (result); ((void)0 |
| |
| class TypeOrigin VALUE_OBJ_CLASS_SPEC { |
| private: |
| typedef enum { |
| CF_LOCALS, // Comes from the current frame locals |
| CF_STACK, // Comes from the current frame expression stack |
| SM_LOCALS, // Comes from stackmap locals |
| SM_STACK, // Comes from stackmap expression stack |
| CONST_POOL, // Comes from the constant pool |
| SIG, // Comes from method signature |
| IMPLICIT, // Comes implicitly from code or context |
| BAD_INDEX, // No type, but the index is bad |
| FRAME_ONLY, // No type, context just contains the frame |
| NONE |
| } Origin; |
| |
| Origin _origin; |
| u2 _index; // local, stack, or constant pool index |
| StackMapFrame* _frame; // source frame if CF or SM |
| VerificationType _type; // The actual type |
| |
| TypeOrigin( |
| Origin origin, u2 index, StackMapFrame* frame, VerificationType type) |
| : _origin(origin), _index(index), _frame(frame), _type(type) {} |
| |
| public: |
| TypeOrigin() : _origin(NONE), _index(0), _frame(NULL) {} |
| |
| static TypeOrigin null(); |
| static TypeOrigin local(u2 index, StackMapFrame* frame); |
| static TypeOrigin stack(u2 index, StackMapFrame* frame); |
| static TypeOrigin sm_local(u2 index, StackMapFrame* frame); |
| static TypeOrigin sm_stack(u2 index, StackMapFrame* frame); |
| static TypeOrigin cp(u2 index, VerificationType vt); |
| static TypeOrigin signature(VerificationType vt); |
| static TypeOrigin bad_index(u2 index); |
| static TypeOrigin implicit(VerificationType t); |
| static TypeOrigin frame(StackMapFrame* frame); |
| |
| void reset_frame(); |
| void details(outputStream* ss) const; |
| void print_frame(outputStream* ss) const; |
| const StackMapFrame* frame() const { return _frame; } |
| bool is_valid() const { return _origin != NONE; } |
| u2 index() const { return _index; } |
| |
| #ifdef ASSERT |
| void print_on(outputStream* str) const; |
| #endif |
| }; |
| |
| class ErrorContext VALUE_OBJ_CLASS_SPEC { |
| private: |
| typedef enum { |
| INVALID_BYTECODE, // There was a problem with the bytecode |
| WRONG_TYPE, // Type value was not as expected |
| FLAGS_MISMATCH, // Frame flags are not assignable |
| BAD_CP_INDEX, // Invalid constant pool index |
| BAD_LOCAL_INDEX, // Invalid local index |
| LOCALS_SIZE_MISMATCH, // Frames have differing local counts |
| STACK_SIZE_MISMATCH, // Frames have different stack sizes |
| STACK_OVERFLOW, // Attempt to push onto a full expression stack |
| STACK_UNDERFLOW, // Attempt to pop and empty expression stack |
| MISSING_STACKMAP, // No stackmap for this location and there should be |
| BAD_STACKMAP, // Format error in stackmap |
| NO_FAULT, // No error |
| UNKNOWN |
| } FaultType; |
| |
| int _bci; |
| FaultType _fault; |
| TypeOrigin _type; |
| TypeOrigin _expected; |
| |
| ErrorContext(int bci, FaultType fault) : |
| _bci(bci), _fault(fault) {} |
| ErrorContext(int bci, FaultType fault, TypeOrigin type) : |
| _bci(bci), _fault(fault), _type(type) {} |
| ErrorContext(int bci, FaultType fault, TypeOrigin type, TypeOrigin exp) : |
| _bci(bci), _fault(fault), _type(type), _expected(exp) {} |
| |
| public: |
| ErrorContext() : _bci(-1), _fault(NO_FAULT) {} |
| |
| static ErrorContext bad_code(u2 bci) { |
| return ErrorContext(bci, INVALID_BYTECODE); |
| } |
| static ErrorContext bad_type(u2 bci, TypeOrigin type) { |
| return ErrorContext(bci, WRONG_TYPE, type); |
| } |
| static ErrorContext bad_type(u2 bci, TypeOrigin type, TypeOrigin exp) { |
| return ErrorContext(bci, WRONG_TYPE, type, exp); |
| } |
| static ErrorContext bad_flags(u2 bci, StackMapFrame* frame) { |
| return ErrorContext(bci, FLAGS_MISMATCH, TypeOrigin::frame(frame)); |
| } |
| static ErrorContext bad_flags(u2 bci, StackMapFrame* cur, StackMapFrame* sm) { |
| return ErrorContext(bci, FLAGS_MISMATCH, |
| TypeOrigin::frame(cur), TypeOrigin::frame(sm)); |
| } |
| static ErrorContext bad_cp_index(u2 bci, u2 index) { |
| return ErrorContext(bci, BAD_CP_INDEX, TypeOrigin::bad_index(index)); |
| } |
| static ErrorContext bad_local_index(u2 bci, u2 index) { |
| return ErrorContext(bci, BAD_LOCAL_INDEX, TypeOrigin::bad_index(index)); |
| } |
| static ErrorContext locals_size_mismatch( |
| u2 bci, StackMapFrame* frame0, StackMapFrame* frame1) { |
| return ErrorContext(bci, LOCALS_SIZE_MISMATCH, |
| TypeOrigin::frame(frame0), TypeOrigin::frame(frame1)); |
| } |
| static ErrorContext stack_size_mismatch( |
| u2 bci, StackMapFrame* frame0, StackMapFrame* frame1) { |
| return ErrorContext(bci, STACK_SIZE_MISMATCH, |
| TypeOrigin::frame(frame0), TypeOrigin::frame(frame1)); |
| } |
| static ErrorContext stack_overflow(u2 bci, StackMapFrame* frame) { |
| return ErrorContext(bci, STACK_OVERFLOW, TypeOrigin::frame(frame)); |
| } |
| static ErrorContext stack_underflow(u2 bci, StackMapFrame* frame) { |
| return ErrorContext(bci, STACK_UNDERFLOW, TypeOrigin::frame(frame)); |
| } |
| static ErrorContext missing_stackmap(u2 bci) { |
| return ErrorContext(bci, MISSING_STACKMAP); |
| } |
| static ErrorContext bad_stackmap(int index, StackMapFrame* frame) { |
| return ErrorContext(0, BAD_STACKMAP, TypeOrigin::frame(frame)); |
| } |
| |
| bool is_valid() const { return _fault != NO_FAULT; } |
| int bci() const { return _bci; } |
| |
| void reset_frames() { |
| _type.reset_frame(); |
| _expected.reset_frame(); |
| } |
| |
| void details(outputStream* ss, const Method* method) const; |
| |
| #ifdef ASSERT |
| void print_on(outputStream* str) const { |
| str->print("error_context(%d, %d,", _bci, _fault); |
| _type.print_on(str); |
| str->print(","); |
| _expected.print_on(str); |
| str->print(")"); |
| } |
| #endif |
| |
| private: |
| void location_details(outputStream* ss, const Method* method) const; |
| void reason_details(outputStream* ss) const; |
| void frame_details(outputStream* ss) const; |
| void bytecode_details(outputStream* ss, const Method* method) const; |
| void handler_details(outputStream* ss, const Method* method) const; |
| void stackmap_details(outputStream* ss, const Method* method) const; |
| }; |
| |
| // A new instance of this class is created for each class being verified |
| class ClassVerifier : public StackObj { |
| private: |
| Thread* _thread; |
| GrowableArray<Symbol*>* _symbols; // keep a list of symbols created |
| |
| Symbol* _exception_type; |
| char* _message; |
| |
| ErrorContext _error_context; // contains information about an error |
| |
| void verify_method(const methodHandle& method, TRAPS); |
| char* generate_code_data(const methodHandle& m, u4 code_length, TRAPS); |
| void verify_exception_handler_table(u4 code_length, char* code_data, |
| int& min, int& max, TRAPS); |
| void verify_local_variable_table(u4 code_length, char* code_data, TRAPS); |
| |
| VerificationType cp_ref_index_to_type( |
| int index, const constantPoolHandle& cp, TRAPS) { |
| return cp_index_to_type(cp->klass_ref_index_at(index), cp, THREAD); |
| } |
| |
| bool is_protected_access( |
| InstanceKlass* this_class, Klass* target_class, |
| Symbol* field_name, Symbol* field_sig, bool is_method); |
| |
| void verify_cp_index(u2 bci, const constantPoolHandle& cp, int index, TRAPS); |
| void verify_cp_type(u2 bci, int index, const constantPoolHandle& cp, |
| unsigned int types, TRAPS); |
| void verify_cp_class_type(u2 bci, int index, const constantPoolHandle& cp, TRAPS); |
| |
| u2 verify_stackmap_table( |
| u2 stackmap_index, u2 bci, StackMapFrame* current_frame, |
| StackMapTable* stackmap_table, bool no_control_flow, TRAPS); |
| |
| void verify_exception_handler_targets( |
| u2 bci, bool this_uninit, StackMapFrame* current_frame, |
| StackMapTable* stackmap_table, TRAPS); |
| |
| void verify_ldc( |
| int opcode, u2 index, StackMapFrame *current_frame, |
| const constantPoolHandle& cp, u2 bci, TRAPS); |
| |
| void verify_switch( |
| RawBytecodeStream* bcs, u4 code_length, char* code_data, |
| StackMapFrame* current_frame, StackMapTable* stackmap_table, TRAPS); |
| |
| void verify_field_instructions( |
| RawBytecodeStream* bcs, StackMapFrame* current_frame, |
| const constantPoolHandle& cp, bool allow_arrays, TRAPS); |
| |
| void verify_invoke_init( |
| RawBytecodeStream* bcs, u2 ref_index, VerificationType ref_class_type, |
| StackMapFrame* current_frame, u4 code_length, bool in_try_block, |
| bool* this_uninit, const constantPoolHandle& cp, StackMapTable* stackmap_table, |
| TRAPS); |
| |
| // Used by ends_in_athrow() to push all handlers that contain bci onto the |
| // handler_stack, if the handler has not already been pushed on the stack. |
| void push_handlers(ExceptionTable* exhandlers, |
| GrowableArray<u4>* handler_list, |
| GrowableArray<u4>* handler_stack, |
| u4 bci); |
| |
| // Returns true if all paths starting with start_bc_offset end in athrow |
| // bytecode or loop. |
| bool ends_in_athrow(u4 start_bc_offset); |
| |
| void verify_invoke_instructions( |
| RawBytecodeStream* bcs, u4 code_length, StackMapFrame* current_frame, |
| bool in_try_block, bool* this_uninit, VerificationType return_type, |
| const constantPoolHandle& cp, StackMapTable* stackmap_table, TRAPS); |
| |
| VerificationType get_newarray_type(u2 index, u2 bci, TRAPS); |
| void verify_anewarray(u2 bci, u2 index, const constantPoolHandle& cp, |
| StackMapFrame* current_frame, TRAPS); |
| void verify_return_value( |
| VerificationType return_type, VerificationType type, u2 offset, |
| StackMapFrame* current_frame, TRAPS); |
| |
| void verify_iload (u2 index, StackMapFrame* current_frame, TRAPS); |
| void verify_lload (u2 index, StackMapFrame* current_frame, TRAPS); |
| void verify_fload (u2 index, StackMapFrame* current_frame, TRAPS); |
| void verify_dload (u2 index, StackMapFrame* current_frame, TRAPS); |
| void verify_aload (u2 index, StackMapFrame* current_frame, TRAPS); |
| void verify_istore(u2 index, StackMapFrame* current_frame, TRAPS); |
| void verify_lstore(u2 index, StackMapFrame* current_frame, TRAPS); |
| void verify_fstore(u2 index, StackMapFrame* current_frame, TRAPS); |
| void verify_dstore(u2 index, StackMapFrame* current_frame, TRAPS); |
| void verify_astore(u2 index, StackMapFrame* current_frame, TRAPS); |
| void verify_iinc (u2 index, StackMapFrame* current_frame, TRAPS); |
| |
| bool name_in_supers(Symbol* ref_name, InstanceKlass* current); |
| |
| VerificationType object_type() const; |
| |
| InstanceKlass* _klass; // the class being verified |
| methodHandle _method; // current method being verified |
| VerificationType _this_type; // the verification type of the current class |
| |
| // Some recursive calls from the verifier to the name resolver |
| // can cause the current class to be re-verified and rewritten. |
| // If this happens, the original verification should not continue, |
| // because constant pool indexes will have changed. |
| // The rewriter is preceded by the verifier. If the verifier throws |
| // an error, rewriting is prevented. Also, rewriting always precedes |
| // bytecode execution or compilation. Thus, is_rewritten implies |
| // that a class has been verified and prepared for execution. |
| bool was_recursively_verified() { return _klass->is_rewritten(); } |
| |
| bool is_same_or_direct_interface(InstanceKlass* klass, |
| VerificationType klass_type, VerificationType ref_class_type); |
| |
| public: |
| enum { |
| BYTECODE_OFFSET = 1, |
| NEW_OFFSET = 2 |
| }; |
| |
| // constructor |
| ClassVerifier(InstanceKlass* klass, TRAPS); |
| |
| // destructor |
| ~ClassVerifier(); |
| |
| Thread* thread() { return _thread; } |
| const methodHandle& method() { return _method; } |
| InstanceKlass* current_class() const { return _klass; } |
| VerificationType current_type() const { return _this_type; } |
| |
| // Verifies the class. If a verify or class file format error occurs, |
| // the '_exception_name' symbols will set to the exception name and |
| // the message_buffer will be filled in with the exception message. |
| void verify_class(TRAPS); |
| |
| // Return status modes |
| Symbol* result() const { return _exception_type; } |
| bool has_error() const { return result() != NULL; } |
| char* exception_message() { |
| stringStream ss; |
| ss.print("%s", _message); |
| _error_context.details(&ss, _method()); |
| return ss.as_string(); |
| } |
| |
| // Called when verify or class format errors are encountered. |
| // May throw an exception based upon the mode. |
| void verify_error(ErrorContext ctx, const char* fmt, ...) ATTRIBUTE_PRINTF(3, 4); |
| void class_format_error(const char* fmt, ...) ATTRIBUTE_PRINTF(2, 3); |
| |
| Klass* load_class(Symbol* name, TRAPS); |
| |
| int change_sig_to_verificationType( |
| SignatureStream* sig_type, VerificationType* inference_type, TRAPS); |
| |
| VerificationType cp_index_to_type(int index, const constantPoolHandle& cp, TRAPS) { |
| return VerificationType::reference_type(cp->klass_name_at(index)); |
| } |
| |
| // Keep a list of temporary symbols created during verification because |
| // their reference counts need to be decremented when the verifier object |
| // goes out of scope. Since these symbols escape the scope in which they're |
| // created, we can't use a TempNewSymbol. |
| Symbol* create_temporary_symbol(const Symbol* s, int begin, int end, TRAPS); |
| Symbol* create_temporary_symbol(const char *s, int length, TRAPS); |
| |
| Symbol* create_temporary_symbol(Symbol* s) { |
| // This version just updates the reference count and saves the symbol to be |
| // dereferenced later. |
| s->increment_refcount(); |
| _symbols->push(s); |
| return s; |
| } |
| |
| TypeOrigin ref_ctx(const char* str, TRAPS); |
| |
| }; |
| |
| inline int ClassVerifier::change_sig_to_verificationType( |
| SignatureStream* sig_type, VerificationType* inference_type, TRAPS) { |
| BasicType bt = sig_type->type(); |
| switch (bt) { |
| case T_OBJECT: |
| case T_ARRAY: |
| { |
| Symbol* name = sig_type->as_symbol(CHECK_0); |
| // Create another symbol to save as signature stream unreferences this symbol. |
| Symbol* name_copy = create_temporary_symbol(name); |
| assert(name_copy == name, "symbols don't match"); |
| *inference_type = |
| VerificationType::reference_type(name_copy); |
| return 1; |
| } |
| case T_LONG: |
| *inference_type = VerificationType::long_type(); |
| *++inference_type = VerificationType::long2_type(); |
| return 2; |
| case T_DOUBLE: |
| *inference_type = VerificationType::double_type(); |
| *++inference_type = VerificationType::double2_type(); |
| return 2; |
| case T_INT: |
| case T_BOOLEAN: |
| case T_BYTE: |
| case T_CHAR: |
| case T_SHORT: |
| *inference_type = VerificationType::integer_type(); |
| return 1; |
| case T_FLOAT: |
| *inference_type = VerificationType::float_type(); |
| return 1; |
| default: |
| ShouldNotReachHere(); |
| return 1; |
| } |
| } |
| |
| #endif // SHARE_VM_CLASSFILE_VERIFIER_HPP |