--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/src/hotspot/share/classfile/verifier.hpp Tue Sep 12 19:03:39 2017 +0200
@@ -0,0 +1,472 @@
+/*
+ * 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