This repository has been archived by the owner on Aug 27, 2022. It is now read-only.
/
verifier.cpp
3178 lines (2986 loc) · 127 KB
/
verifier.cpp
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
/*
* Copyright (c) 1998, 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
* 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 "precompiled.hpp"
#include "jvm.h"
#include "classfile/classFileStream.hpp"
#include "classfile/classLoader.hpp"
#include "classfile/javaClasses.hpp"
#include "classfile/stackMapTable.hpp"
#include "classfile/stackMapFrame.hpp"
#include "classfile/stackMapTableFormat.hpp"
#include "classfile/symbolTable.hpp"
#include "classfile/systemDictionary.hpp"
#include "classfile/verifier.hpp"
#include "classfile/vmSymbols.hpp"
#include "interpreter/bytecodes.hpp"
#include "interpreter/bytecodeStream.hpp"
#include "logging/log.hpp"
#include "logging/logStream.hpp"
#include "memory/oopFactory.hpp"
#include "memory/resourceArea.hpp"
#include "memory/universe.hpp"
#include "oops/constantPool.inline.hpp"
#include "oops/instanceKlass.hpp"
#include "oops/oop.inline.hpp"
#include "oops/typeArrayOop.hpp"
#include "runtime/fieldDescriptor.hpp"
#include "runtime/handles.inline.hpp"
#include "runtime/interfaceSupport.inline.hpp"
#include "runtime/javaCalls.hpp"
#include "runtime/jniHandles.inline.hpp"
#include "runtime/os.hpp"
#include "runtime/safepointVerifiers.hpp"
#include "runtime/thread.hpp"
#include "services/threadService.hpp"
#include "utilities/align.hpp"
#include "utilities/bytes.hpp"
#define NOFAILOVER_MAJOR_VERSION 51
#define NONZERO_PADDING_BYTES_IN_SWITCH_MAJOR_VERSION 51
#define STATIC_METHOD_IN_INTERFACE_MAJOR_VERSION 52
#define MAX_ARRAY_DIMENSIONS 255
// Access to external entry for VerifyClassForMajorVersion - old byte code verifier
extern "C" {
typedef jboolean (*verify_byte_codes_fn_t)(JNIEnv *, jclass, char *, jint, jint);
}
static verify_byte_codes_fn_t volatile _verify_byte_codes_fn = NULL;
static verify_byte_codes_fn_t verify_byte_codes_fn() {
if (_verify_byte_codes_fn != NULL)
return _verify_byte_codes_fn;
MutexLocker locker(Verify_lock);
if (_verify_byte_codes_fn != NULL)
return _verify_byte_codes_fn;
// Load verify dll
char buffer[JVM_MAXPATHLEN];
char ebuf[1024];
if (!os::dll_locate_lib(buffer, sizeof(buffer), Arguments::get_dll_dir(), "verify"))
return NULL; // Caller will throw VerifyError
void *lib_handle = os::dll_load(buffer, ebuf, sizeof(ebuf));
if (lib_handle == NULL)
return NULL; // Caller will throw VerifyError
void *fn = os::dll_lookup(lib_handle, "VerifyClassForMajorVersion");
if (fn == NULL)
return NULL; // Caller will throw VerifyError
return _verify_byte_codes_fn = CAST_TO_FN_PTR(verify_byte_codes_fn_t, fn);
}
// Methods in Verifier
bool Verifier::should_verify_for(oop class_loader, bool should_verify_class) {
return (class_loader == NULL || !should_verify_class) ?
BytecodeVerificationLocal : BytecodeVerificationRemote;
}
bool Verifier::relax_access_for(oop loader) {
bool trusted = java_lang_ClassLoader::is_trusted_loader(loader);
bool need_verify =
// verifyAll
(BytecodeVerificationLocal && BytecodeVerificationRemote) ||
// verifyRemote
(!BytecodeVerificationLocal && BytecodeVerificationRemote && !trusted);
return !need_verify;
}
void Verifier::trace_class_resolution(Klass* resolve_class, InstanceKlass* verify_class) {
assert(verify_class != NULL, "Unexpected null verify_class");
ResourceMark rm;
Symbol* s = verify_class->source_file_name();
const char* source_file = (s != NULL ? s->as_C_string() : NULL);
const char* verify = verify_class->external_name();
const char* resolve = resolve_class->external_name();
// print in a single call to reduce interleaving between threads
if (source_file != NULL) {
log_debug(class, resolve)("%s %s %s (verification)", verify, resolve, source_file);
} else {
log_debug(class, resolve)("%s %s (verification)", verify, resolve);
}
}
// Prints the end-verification message to the appropriate output.
void Verifier::log_end_verification(outputStream* st, const char* klassName, Symbol* exception_name, TRAPS) {
if (HAS_PENDING_EXCEPTION) {
st->print("Verification for %s has", klassName);
oop message = java_lang_Throwable::message(PENDING_EXCEPTION);
if (message != NULL) {
char* ex_msg = java_lang_String::as_utf8_string(message);
st->print_cr(" exception pending '%s %s'",
PENDING_EXCEPTION->klass()->external_name(), ex_msg);
} else {
st->print_cr(" exception pending %s ",
PENDING_EXCEPTION->klass()->external_name());
}
} else if (exception_name != NULL) {
st->print_cr("Verification for %s failed", klassName);
}
st->print_cr("End class verification for: %s", klassName);
}
bool Verifier::verify(InstanceKlass* klass, bool should_verify_class, TRAPS) {
HandleMark hm(THREAD);
ResourceMark rm(THREAD);
// Eagerly allocate the identity hash code for a klass. This is a fallout
// from 6320749 and 8059924: hash code generator is not supposed to be called
// during the safepoint, but it allows to sneak the hashcode in during
// verification. Without this eager hashcode generation, we may end up
// installing the hashcode during some other operation, which may be at
// safepoint -- blowing up the checks. It was previously done as the side
// effect (sic!) for external_name(), but instead of doing that, we opt to
// explicitly push the hashcode in here. This is signify the following block
// is IMPORTANT:
if (klass->java_mirror() != NULL) {
klass->java_mirror()->identity_hash();
}
if (!is_eligible_for_verification(klass, should_verify_class)) {
return true;
}
// Timer includes any side effects of class verification (resolution,
// etc), but not recursive calls to Verifier::verify().
JavaThread* jt = (JavaThread*)THREAD;
PerfClassTraceTime timer(ClassLoader::perf_class_verify_time(),
ClassLoader::perf_class_verify_selftime(),
ClassLoader::perf_classes_verified(),
jt->get_thread_stat()->perf_recursion_counts_addr(),
jt->get_thread_stat()->perf_timers_addr(),
PerfClassTraceTime::CLASS_VERIFY);
// If the class should be verified, first see if we can use the split
// verifier. If not, or if verification fails and can failover, then
// call the inference verifier.
Symbol* exception_name = NULL;
const size_t message_buffer_len = klass->name()->utf8_length() + 1024;
char* message_buffer = NULL;
char* exception_message = NULL;
log_info(class, init)("Start class verification for: %s", klass->external_name());
if (klass->major_version() >= STACKMAP_ATTRIBUTE_MAJOR_VERSION) {
ClassVerifier split_verifier(klass, THREAD);
split_verifier.verify_class(THREAD);
exception_name = split_verifier.result();
// If DumpSharedSpaces is set then don't fall back to the old verifier on
// verification failure. If a class fails verification with the split verifier,
// it might fail the CDS runtime verifier constraint check. In that case, we
// don't want to share the class. We only archive classes that pass the split
// verifier.
bool can_failover = !DumpSharedSpaces &&
klass->major_version() < NOFAILOVER_MAJOR_VERSION;
if (can_failover && !HAS_PENDING_EXCEPTION && // Split verifier doesn't set PENDING_EXCEPTION for failure
(exception_name == vmSymbols::java_lang_VerifyError() ||
exception_name == vmSymbols::java_lang_ClassFormatError())) {
log_info(verification)("Fail over class verification to old verifier for: %s", klass->external_name());
log_info(class, init)("Fail over class verification to old verifier for: %s", klass->external_name());
message_buffer = NEW_RESOURCE_ARRAY(char, message_buffer_len);
exception_message = message_buffer;
exception_name = inference_verify(
klass, message_buffer, message_buffer_len, THREAD);
}
if (exception_name != NULL) {
exception_message = split_verifier.exception_message();
}
} else {
message_buffer = NEW_RESOURCE_ARRAY(char, message_buffer_len);
exception_message = message_buffer;
exception_name = inference_verify(
klass, message_buffer, message_buffer_len, THREAD);
}
LogTarget(Info, class, init) lt1;
if (lt1.is_enabled()) {
LogStream ls(lt1);
log_end_verification(&ls, klass->external_name(), exception_name, THREAD);
}
LogTarget(Info, verification) lt2;
if (lt2.is_enabled()) {
LogStream ls(lt2);
log_end_verification(&ls, klass->external_name(), exception_name, THREAD);
}
if (HAS_PENDING_EXCEPTION) {
return false; // use the existing exception
} else if (exception_name == NULL) {
return true; // verification succeeded
} else { // VerifyError or ClassFormatError to be created and thrown
Klass* kls =
SystemDictionary::resolve_or_fail(exception_name, true, CHECK_false);
if (log_is_enabled(Debug, class, resolve)) {
Verifier::trace_class_resolution(kls, klass);
}
while (kls != NULL) {
if (kls == klass) {
// If the class being verified is the exception we're creating
// or one of it's superclasses, we're in trouble and are going
// to infinitely recurse when we try to initialize the exception.
// So bail out here by throwing the preallocated VM error.
THROW_OOP_(Universe::virtual_machine_error_instance(), false);
}
kls = kls->super();
}
if (message_buffer != NULL) {
message_buffer[message_buffer_len - 1] = '\0'; // just to be sure
}
assert(exception_message != NULL, "");
THROW_MSG_(exception_name, exception_message, false);
}
}
bool Verifier::is_eligible_for_verification(InstanceKlass* klass, bool should_verify_class) {
Symbol* name = klass->name();
Klass* refl_magic_klass = SystemDictionary::reflect_MagicAccessorImpl_klass();
bool is_reflect = refl_magic_klass != NULL && klass->is_subtype_of(refl_magic_klass);
return (should_verify_for(klass->class_loader(), should_verify_class) &&
// return if the class is a bootstrapping class
// or defineClass specified not to verify by default (flags override passed arg)
// We need to skip the following four for bootstraping
name != vmSymbols::java_lang_Object() &&
name != vmSymbols::java_lang_Class() &&
name != vmSymbols::java_lang_String() &&
name != vmSymbols::java_lang_Throwable() &&
// Can not verify the bytecodes for shared classes because they have
// already been rewritten to contain constant pool cache indices,
// which the verifier can't understand.
// Shared classes shouldn't have stackmaps either.
!klass->is_shared() &&
// As of the fix for 4486457 we disable verification for all of the
// dynamically-generated bytecodes associated with the 1.4
// reflection implementation, not just those associated with
// jdk/internal/reflect/SerializationConstructorAccessor.
// NOTE: this is called too early in the bootstrapping process to be
// guarded by Universe::is_gte_jdk14x_version().
// Also for lambda generated code, gte jdk8
(!is_reflect));
}
Symbol* Verifier::inference_verify(
InstanceKlass* klass, char* message, size_t message_len, TRAPS) {
JavaThread* thread = (JavaThread*)THREAD;
verify_byte_codes_fn_t verify_func = verify_byte_codes_fn();
if (verify_func == NULL) {
jio_snprintf(message, message_len, "Could not link verifier");
return vmSymbols::java_lang_VerifyError();
}
ResourceMark rm(thread);
log_info(verification)("Verifying class %s with old format", klass->external_name());
jclass cls = (jclass) JNIHandles::make_local(thread, klass->java_mirror());
jint result;
{
HandleMark hm(thread);
ThreadToNativeFromVM ttn(thread);
// ThreadToNativeFromVM takes care of changing thread_state, so safepoint
// code knows that we have left the VM
JNIEnv *env = thread->jni_environment();
result = (*verify_func)(env, cls, message, (int)message_len, klass->major_version());
}
JNIHandles::destroy_local(cls);
// These numbers are chosen so that VerifyClassCodes interface doesn't need
// to be changed (still return jboolean (unsigned char)), and result is
// 1 when verification is passed.
if (result == 0) {
return vmSymbols::java_lang_VerifyError();
} else if (result == 1) {
return NULL; // verified.
} else if (result == 2) {
THROW_MSG_(vmSymbols::java_lang_OutOfMemoryError(), message, NULL);
} else if (result == 3) {
return vmSymbols::java_lang_ClassFormatError();
} else {
ShouldNotReachHere();
return NULL;
}
}
TypeOrigin TypeOrigin::null() {
return TypeOrigin();
}
TypeOrigin TypeOrigin::local(u2 index, StackMapFrame* frame) {
assert(frame != NULL, "Must have a frame");
return TypeOrigin(CF_LOCALS, index, StackMapFrame::copy(frame),
frame->local_at(index));
}
TypeOrigin TypeOrigin::stack(u2 index, StackMapFrame* frame) {
assert(frame != NULL, "Must have a frame");
return TypeOrigin(CF_STACK, index, StackMapFrame::copy(frame),
frame->stack_at(index));
}
TypeOrigin TypeOrigin::sm_local(u2 index, StackMapFrame* frame) {
assert(frame != NULL, "Must have a frame");
return TypeOrigin(SM_LOCALS, index, StackMapFrame::copy(frame),
frame->local_at(index));
}
TypeOrigin TypeOrigin::sm_stack(u2 index, StackMapFrame* frame) {
assert(frame != NULL, "Must have a frame");
return TypeOrigin(SM_STACK, index, StackMapFrame::copy(frame),
frame->stack_at(index));
}
TypeOrigin TypeOrigin::bad_index(u2 index) {
return TypeOrigin(BAD_INDEX, index, NULL, VerificationType::bogus_type());
}
TypeOrigin TypeOrigin::cp(u2 index, VerificationType vt) {
return TypeOrigin(CONST_POOL, index, NULL, vt);
}
TypeOrigin TypeOrigin::signature(VerificationType vt) {
return TypeOrigin(SIG, 0, NULL, vt);
}
TypeOrigin TypeOrigin::implicit(VerificationType t) {
return TypeOrigin(IMPLICIT, 0, NULL, t);
}
TypeOrigin TypeOrigin::frame(StackMapFrame* frame) {
return TypeOrigin(FRAME_ONLY, 0, StackMapFrame::copy(frame),
VerificationType::bogus_type());
}
void TypeOrigin::reset_frame() {
if (_frame != NULL) {
_frame->restore();
}
}
void TypeOrigin::details(outputStream* ss) const {
_type.print_on(ss);
switch (_origin) {
case CF_LOCALS:
ss->print(" (current frame, locals[%d])", _index);
break;
case CF_STACK:
ss->print(" (current frame, stack[%d])", _index);
break;
case SM_LOCALS:
ss->print(" (stack map, locals[%d])", _index);
break;
case SM_STACK:
ss->print(" (stack map, stack[%d])", _index);
break;
case CONST_POOL:
ss->print(" (constant pool %d)", _index);
break;
case SIG:
ss->print(" (from method signature)");
break;
case IMPLICIT:
case FRAME_ONLY:
case NONE:
default:
;
}
}
#ifdef ASSERT
void TypeOrigin::print_on(outputStream* str) const {
str->print("{%d,%d,%p:", _origin, _index, _frame);
if (_frame != NULL) {
_frame->print_on(str);
} else {
str->print("null");
}
str->print(",");
_type.print_on(str);
str->print("}");
}
#endif
void ErrorContext::details(outputStream* ss, const Method* method) const {
if (is_valid()) {
ss->cr();
ss->print_cr("Exception Details:");
location_details(ss, method);
reason_details(ss);
frame_details(ss);
bytecode_details(ss, method);
handler_details(ss, method);
stackmap_details(ss, method);
}
}
void ErrorContext::reason_details(outputStream* ss) const {
streamIndentor si(ss);
ss->indent().print_cr("Reason:");
streamIndentor si2(ss);
ss->indent().print("%s", "");
switch (_fault) {
case INVALID_BYTECODE:
ss->print("Error exists in the bytecode");
break;
case WRONG_TYPE:
if (_expected.is_valid()) {
ss->print("Type ");
_type.details(ss);
ss->print(" is not assignable to ");
_expected.details(ss);
} else {
ss->print("Invalid type: ");
_type.details(ss);
}
break;
case FLAGS_MISMATCH:
if (_expected.is_valid()) {
ss->print("Current frame's flags are not assignable "
"to stack map frame's.");
} else {
ss->print("Current frame's flags are invalid in this context.");
}
break;
case BAD_CP_INDEX:
ss->print("Constant pool index %d is invalid", _type.index());
break;
case BAD_LOCAL_INDEX:
ss->print("Local index %d is invalid", _type.index());
break;
case LOCALS_SIZE_MISMATCH:
ss->print("Current frame's local size doesn't match stackmap.");
break;
case STACK_SIZE_MISMATCH:
ss->print("Current frame's stack size doesn't match stackmap.");
break;
case STACK_OVERFLOW:
ss->print("Exceeded max stack size.");
break;
case STACK_UNDERFLOW:
ss->print("Attempt to pop empty stack.");
break;
case MISSING_STACKMAP:
ss->print("Expected stackmap frame at this location.");
break;
case BAD_STACKMAP:
ss->print("Invalid stackmap specification.");
break;
case UNKNOWN:
default:
ShouldNotReachHere();
ss->print_cr("Unknown");
}
ss->cr();
}
void ErrorContext::location_details(outputStream* ss, const Method* method) const {
if (_bci != -1 && method != NULL) {
streamIndentor si(ss);
const char* bytecode_name = "<invalid>";
if (method->validate_bci(_bci) != -1) {
Bytecodes::Code code = Bytecodes::code_or_bp_at(method->bcp_from(_bci));
if (Bytecodes::is_defined(code)) {
bytecode_name = Bytecodes::name(code);
} else {
bytecode_name = "<illegal>";
}
}
InstanceKlass* ik = method->method_holder();
ss->indent().print_cr("Location:");
streamIndentor si2(ss);
ss->indent().print_cr("%s.%s%s @%d: %s",
ik->name()->as_C_string(), method->name()->as_C_string(),
method->signature()->as_C_string(), _bci, bytecode_name);
}
}
void ErrorContext::frame_details(outputStream* ss) const {
streamIndentor si(ss);
if (_type.is_valid() && _type.frame() != NULL) {
ss->indent().print_cr("Current Frame:");
streamIndentor si2(ss);
_type.frame()->print_on(ss);
}
if (_expected.is_valid() && _expected.frame() != NULL) {
ss->indent().print_cr("Stackmap Frame:");
streamIndentor si2(ss);
_expected.frame()->print_on(ss);
}
}
void ErrorContext::bytecode_details(outputStream* ss, const Method* method) const {
if (method != NULL) {
streamIndentor si(ss);
ss->indent().print_cr("Bytecode:");
streamIndentor si2(ss);
ss->print_data(method->code_base(), method->code_size(), false);
}
}
void ErrorContext::handler_details(outputStream* ss, const Method* method) const {
if (method != NULL) {
streamIndentor si(ss);
ExceptionTable table(method);
if (table.length() > 0) {
ss->indent().print_cr("Exception Handler Table:");
streamIndentor si2(ss);
for (int i = 0; i < table.length(); ++i) {
ss->indent().print_cr("bci [%d, %d] => handler: %d", table.start_pc(i),
table.end_pc(i), table.handler_pc(i));
}
}
}
}
void ErrorContext::stackmap_details(outputStream* ss, const Method* method) const {
if (method != NULL && method->has_stackmap_table()) {
streamIndentor si(ss);
ss->indent().print_cr("Stackmap Table:");
Array<u1>* data = method->stackmap_data();
stack_map_table* sm_table =
stack_map_table::at((address)data->adr_at(0));
stack_map_frame* sm_frame = sm_table->entries();
streamIndentor si2(ss);
int current_offset = -1;
address end_of_sm_table = (address)sm_table + method->stackmap_data()->length();
for (u2 i = 0; i < sm_table->number_of_entries(); ++i) {
ss->indent();
if (!sm_frame->verify((address)sm_frame, end_of_sm_table)) {
sm_frame->print_truncated(ss, current_offset);
return;
}
sm_frame->print_on(ss, current_offset);
ss->cr();
current_offset += sm_frame->offset_delta();
sm_frame = sm_frame->next();
}
}
}
// Methods in ClassVerifier
ClassVerifier::ClassVerifier(
InstanceKlass* klass, TRAPS)
: _thread(THREAD), _previous_symbol(NULL), _symbols(NULL), _exception_type(NULL),
_message(NULL), _method_signatures_table(NULL), _klass(klass) {
_this_type = VerificationType::reference_type(klass->name());
}
ClassVerifier::~ClassVerifier() {
// Decrement the reference count for any symbols created.
if (_symbols != NULL) {
for (int i = 0; i < _symbols->length(); i++) {
Symbol* s = _symbols->at(i);
s->decrement_refcount();
}
}
}
VerificationType ClassVerifier::object_type() const {
return VerificationType::reference_type(vmSymbols::java_lang_Object());
}
TypeOrigin ClassVerifier::ref_ctx(const char* sig) {
VerificationType vt = VerificationType::reference_type(
create_temporary_symbol(sig, (int)strlen(sig)));
return TypeOrigin::implicit(vt);
}
void ClassVerifier::verify_class(TRAPS) {
log_info(verification)("Verifying class %s with new format", _klass->external_name());
// Either verifying both local and remote classes or just remote classes.
assert(BytecodeVerificationRemote, "Should not be here");
// Create hash table containing method signatures.
method_signatures_table_type method_signatures_table;
set_method_signatures_table(&method_signatures_table);
Array<Method*>* methods = _klass->methods();
int num_methods = methods->length();
for (int index = 0; index < num_methods; index++) {
// Check for recursive re-verification before each method.
if (was_recursively_verified()) return;
Method* m = methods->at(index);
if (m->is_native() || m->is_abstract() || m->is_overpass()) {
// If m is native or abstract, skip it. It is checked in class file
// parser that methods do not override a final method. Overpass methods
// are trusted since the VM generates them.
continue;
}
verify_method(methodHandle(THREAD, m), CHECK_VERIFY(this));
}
if (was_recursively_verified()){
log_info(verification)("Recursive verification detected for: %s", _klass->external_name());
log_info(class, init)("Recursive verification detected for: %s",
_klass->external_name());
}
}
// Translate the signature entries into verification types and save them in
// the growable array. Also, save the count of arguments.
void ClassVerifier::translate_signature(Symbol* const method_sig,
sig_as_verification_types* sig_verif_types,
TRAPS) {
SignatureStream sig_stream(method_sig);
VerificationType sig_type[2];
int sig_i = 0;
GrowableArray<VerificationType>* verif_types = sig_verif_types->sig_verif_types();
// Translate the signature arguments into verification types.
while (!sig_stream.at_return_type()) {
int n = change_sig_to_verificationType(&sig_stream, sig_type);
assert(n <= 2, "Unexpected signature type");
// Store verification type(s). Longs and Doubles each have two verificationTypes.
for (int x = 0; x < n; x++) {
verif_types->push(sig_type[x]);
}
sig_i += n;
sig_stream.next();
}
// Set final arg count, not including the return type. The final arg count will
// be compared with sig_verify_types' length to see if there is a return type.
sig_verif_types->set_num_args(sig_i);
// Store verification type(s) for the return type, if there is one.
if (sig_stream.type() != T_VOID) {
int n = change_sig_to_verificationType(&sig_stream, sig_type);
assert(n <= 2, "Unexpected signature return type");
for (int y = 0; y < n; y++) {
verif_types->push(sig_type[y]);
}
}
}
void ClassVerifier::create_method_sig_entry(sig_as_verification_types* sig_verif_types,
int sig_index, TRAPS) {
// Translate the signature into verification types.
ConstantPool* cp = _klass->constants();
Symbol* const method_sig = cp->symbol_at(sig_index);
translate_signature(method_sig, sig_verif_types, CHECK_VERIFY(this));
// Add the list of this signature's verification types to the table.
bool is_unique = method_signatures_table()->put(sig_index, sig_verif_types);
assert(is_unique, "Duplicate entries in method_signature_table");
}
void ClassVerifier::verify_method(const methodHandle& m, TRAPS) {
HandleMark hm(THREAD);
_method = m; // initialize _method
log_info(verification)("Verifying method %s", m->name_and_sig_as_C_string());
// For clang, the only good constant format string is a literal constant format string.
#define bad_type_msg "Bad type on operand stack in %s"
int32_t max_stack = m->verifier_max_stack();
int32_t max_locals = m->max_locals();
constantPoolHandle cp(THREAD, m->constants());
// Method signature was checked in ClassFileParser.
assert(SignatureVerifier::is_valid_method_signature(m->signature()),
"Invalid method signature");
// Initial stack map frame: offset is 0, stack is initially empty.
StackMapFrame current_frame(max_locals, max_stack, this);
// Set initial locals
VerificationType return_type = current_frame.set_locals_from_arg(
m, current_type(), CHECK_VERIFY(this));
int32_t stackmap_index = 0; // index to the stackmap array
u4 code_length = m->code_size();
// Scan the bytecode and map each instruction's start offset to a number.
char* code_data = generate_code_data(m, code_length, CHECK_VERIFY(this));
int ex_min = code_length;
int ex_max = -1;
// Look through each item on the exception table. Each of the fields must refer
// to a legal instruction.
if (was_recursively_verified()) return;
verify_exception_handler_table(
code_length, code_data, ex_min, ex_max, CHECK_VERIFY(this));
// Look through each entry on the local variable table and make sure
// its range of code array offsets is valid. (4169817)
if (m->has_localvariable_table()) {
verify_local_variable_table(code_length, code_data, CHECK_VERIFY(this));
}
Array<u1>* stackmap_data = m->stackmap_data();
StackMapStream stream(stackmap_data);
StackMapReader reader(this, &stream, code_data, code_length, THREAD);
StackMapTable stackmap_table(&reader, ¤t_frame, max_locals, max_stack,
code_data, code_length, CHECK_VERIFY(this));
LogTarget(Debug, verification) lt;
if (lt.is_enabled()) {
ResourceMark rm(THREAD);
LogStream ls(lt);
stackmap_table.print_on(&ls);
}
RawBytecodeStream bcs(m);
// Scan the byte code linearly from the start to the end
bool no_control_flow = false; // Set to true when there is no direct control
// flow from current instruction to the next
// instruction in sequence
Bytecodes::Code opcode;
while (!bcs.is_last_bytecode()) {
// Check for recursive re-verification before each bytecode.
if (was_recursively_verified()) return;
opcode = bcs.raw_next();
u2 bci = bcs.bci();
// Set current frame's offset to bci
current_frame.set_offset(bci);
current_frame.set_mark();
// Make sure every offset in stackmap table point to the beginning to
// an instruction. Match current_frame to stackmap_table entry with
// the same offset if exists.
stackmap_index = verify_stackmap_table(
stackmap_index, bci, ¤t_frame, &stackmap_table,
no_control_flow, CHECK_VERIFY(this));
bool this_uninit = false; // Set to true when invokespecial <init> initialized 'this'
bool verified_exc_handlers = false;
// Merge with the next instruction
{
u2 index;
int target;
VerificationType type, type2;
VerificationType atype;
LogTarget(Debug, verification) lt;
if (lt.is_enabled()) {
ResourceMark rm(THREAD);
LogStream ls(lt);
current_frame.print_on(&ls);
lt.print("offset = %d, opcode = %s", bci,
opcode == Bytecodes::_illegal ? "illegal" : Bytecodes::name(opcode));
}
// Make sure wide instruction is in correct format
if (bcs.is_wide()) {
if (opcode != Bytecodes::_iinc && opcode != Bytecodes::_iload &&
opcode != Bytecodes::_aload && opcode != Bytecodes::_lload &&
opcode != Bytecodes::_istore && opcode != Bytecodes::_astore &&
opcode != Bytecodes::_lstore && opcode != Bytecodes::_fload &&
opcode != Bytecodes::_dload && opcode != Bytecodes::_fstore &&
opcode != Bytecodes::_dstore) {
/* Unreachable? RawBytecodeStream's raw_next() returns 'illegal'
* if we encounter a wide instruction that modifies an invalid
* opcode (not one of the ones listed above) */
verify_error(ErrorContext::bad_code(bci), "Bad wide instruction");
return;
}
}
// Look for possible jump target in exception handlers and see if it
// matches current_frame. Do this check here for astore*, dstore*,
// fstore*, istore*, and lstore* opcodes because they can change the type
// state by adding a local. JVM Spec says that the incoming type state
// should be used for this check. So, do the check here before a possible
// local is added to the type state.
if (Bytecodes::is_store_into_local(opcode) && bci >= ex_min && bci < ex_max) {
if (was_recursively_verified()) return;
verify_exception_handler_targets(
bci, this_uninit, ¤t_frame, &stackmap_table, CHECK_VERIFY(this));
verified_exc_handlers = true;
}
if (was_recursively_verified()) return;
switch (opcode) {
case Bytecodes::_nop :
no_control_flow = false; break;
case Bytecodes::_aconst_null :
current_frame.push_stack(
VerificationType::null_type(), CHECK_VERIFY(this));
no_control_flow = false; break;
case Bytecodes::_iconst_m1 :
case Bytecodes::_iconst_0 :
case Bytecodes::_iconst_1 :
case Bytecodes::_iconst_2 :
case Bytecodes::_iconst_3 :
case Bytecodes::_iconst_4 :
case Bytecodes::_iconst_5 :
current_frame.push_stack(
VerificationType::integer_type(), CHECK_VERIFY(this));
no_control_flow = false; break;
case Bytecodes::_lconst_0 :
case Bytecodes::_lconst_1 :
current_frame.push_stack_2(
VerificationType::long_type(),
VerificationType::long2_type(), CHECK_VERIFY(this));
no_control_flow = false; break;
case Bytecodes::_fconst_0 :
case Bytecodes::_fconst_1 :
case Bytecodes::_fconst_2 :
current_frame.push_stack(
VerificationType::float_type(), CHECK_VERIFY(this));
no_control_flow = false; break;
case Bytecodes::_dconst_0 :
case Bytecodes::_dconst_1 :
current_frame.push_stack_2(
VerificationType::double_type(),
VerificationType::double2_type(), CHECK_VERIFY(this));
no_control_flow = false; break;
case Bytecodes::_sipush :
case Bytecodes::_bipush :
current_frame.push_stack(
VerificationType::integer_type(), CHECK_VERIFY(this));
no_control_flow = false; break;
case Bytecodes::_ldc :
verify_ldc(
opcode, bcs.get_index_u1(), ¤t_frame,
cp, bci, CHECK_VERIFY(this));
no_control_flow = false; break;
case Bytecodes::_ldc_w :
case Bytecodes::_ldc2_w :
verify_ldc(
opcode, bcs.get_index_u2(), ¤t_frame,
cp, bci, CHECK_VERIFY(this));
no_control_flow = false; break;
case Bytecodes::_iload :
verify_iload(bcs.get_index(), ¤t_frame, CHECK_VERIFY(this));
no_control_flow = false; break;
case Bytecodes::_iload_0 :
case Bytecodes::_iload_1 :
case Bytecodes::_iload_2 :
case Bytecodes::_iload_3 :
index = opcode - Bytecodes::_iload_0;
verify_iload(index, ¤t_frame, CHECK_VERIFY(this));
no_control_flow = false; break;
case Bytecodes::_lload :
verify_lload(bcs.get_index(), ¤t_frame, CHECK_VERIFY(this));
no_control_flow = false; break;
case Bytecodes::_lload_0 :
case Bytecodes::_lload_1 :
case Bytecodes::_lload_2 :
case Bytecodes::_lload_3 :
index = opcode - Bytecodes::_lload_0;
verify_lload(index, ¤t_frame, CHECK_VERIFY(this));
no_control_flow = false; break;
case Bytecodes::_fload :
verify_fload(bcs.get_index(), ¤t_frame, CHECK_VERIFY(this));
no_control_flow = false; break;
case Bytecodes::_fload_0 :
case Bytecodes::_fload_1 :
case Bytecodes::_fload_2 :
case Bytecodes::_fload_3 :
index = opcode - Bytecodes::_fload_0;
verify_fload(index, ¤t_frame, CHECK_VERIFY(this));
no_control_flow = false; break;
case Bytecodes::_dload :
verify_dload(bcs.get_index(), ¤t_frame, CHECK_VERIFY(this));
no_control_flow = false; break;
case Bytecodes::_dload_0 :
case Bytecodes::_dload_1 :
case Bytecodes::_dload_2 :
case Bytecodes::_dload_3 :
index = opcode - Bytecodes::_dload_0;
verify_dload(index, ¤t_frame, CHECK_VERIFY(this));
no_control_flow = false; break;
case Bytecodes::_aload :
verify_aload(bcs.get_index(), ¤t_frame, CHECK_VERIFY(this));
no_control_flow = false; break;
case Bytecodes::_aload_0 :
case Bytecodes::_aload_1 :
case Bytecodes::_aload_2 :
case Bytecodes::_aload_3 :
index = opcode - Bytecodes::_aload_0;
verify_aload(index, ¤t_frame, CHECK_VERIFY(this));
no_control_flow = false; break;
case Bytecodes::_iaload :
type = current_frame.pop_stack(
VerificationType::integer_type(), CHECK_VERIFY(this));
atype = current_frame.pop_stack(
VerificationType::reference_check(), CHECK_VERIFY(this));
if (!atype.is_int_array()) {
verify_error(ErrorContext::bad_type(bci,
current_frame.stack_top_ctx(), ref_ctx("[I")),
bad_type_msg, "iaload");
return;
}
current_frame.push_stack(
VerificationType::integer_type(), CHECK_VERIFY(this));
no_control_flow = false; break;
case Bytecodes::_baload :
type = current_frame.pop_stack(
VerificationType::integer_type(), CHECK_VERIFY(this));
atype = current_frame.pop_stack(
VerificationType::reference_check(), CHECK_VERIFY(this));
if (!atype.is_bool_array() && !atype.is_byte_array()) {
verify_error(
ErrorContext::bad_type(bci, current_frame.stack_top_ctx()),
bad_type_msg, "baload");
return;
}
current_frame.push_stack(
VerificationType::integer_type(), CHECK_VERIFY(this));
no_control_flow = false; break;
case Bytecodes::_caload :
type = current_frame.pop_stack(
VerificationType::integer_type(), CHECK_VERIFY(this));
atype = current_frame.pop_stack(
VerificationType::reference_check(), CHECK_VERIFY(this));
if (!atype.is_char_array()) {
verify_error(ErrorContext::bad_type(bci,
current_frame.stack_top_ctx(), ref_ctx("[C")),
bad_type_msg, "caload");
return;
}
current_frame.push_stack(
VerificationType::integer_type(), CHECK_VERIFY(this));
no_control_flow = false; break;
case Bytecodes::_saload :
type = current_frame.pop_stack(
VerificationType::integer_type(), CHECK_VERIFY(this));
atype = current_frame.pop_stack(
VerificationType::reference_check(), CHECK_VERIFY(this));
if (!atype.is_short_array()) {
verify_error(ErrorContext::bad_type(bci,
current_frame.stack_top_ctx(), ref_ctx("[S")),
bad_type_msg, "saload");
return;
}
current_frame.push_stack(
VerificationType::integer_type(), CHECK_VERIFY(this));
no_control_flow = false; break;
case Bytecodes::_laload :
type = current_frame.pop_stack(
VerificationType::integer_type(), CHECK_VERIFY(this));
atype = current_frame.pop_stack(
VerificationType::reference_check(), CHECK_VERIFY(this));
if (!atype.is_long_array()) {
verify_error(ErrorContext::bad_type(bci,
current_frame.stack_top_ctx(), ref_ctx("[J")),
bad_type_msg, "laload");
return;
}
current_frame.push_stack_2(