/
ubsan.c
1667 lines (1338 loc) · 48.8 KB
/
ubsan.c
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
/* $NetBSD: ubsan.c,v 1.7 2019/10/04 12:12:47 mrg Exp $ */
/*-
* Copyright (c) 2018 The NetBSD Foundation, Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
/*
* The micro UBSan implementation for the userland (uUBSan) and kernel (kUBSan).
* The uBSSan versions is suitable for inclusion into libc or used standalone
* with ATF tests.
*
* This file due to long symbol names generated by a compiler during the
* instrumentation process does not follow the KNF style with 80-column limit.
*/
#include <sys/cdefs.h>
#if defined(_KERNEL)
__KERNEL_RCSID(0, "$NetBSD: ubsan.c,v 1.7 2019/10/04 12:12:47 mrg Exp $");
#else
__RCSID("$NetBSD: ubsan.c,v 1.7 2019/10/04 12:12:47 mrg Exp $");
#endif
#if defined(_KERNEL)
#include <sys/param.h>
#include <sys/types.h>
#include <sys/stdarg.h>
#define ASSERT(x) KASSERT(x)
#else
#if defined(_LIBC)
#include "namespace.h"
#endif
#include <sys/param.h>
#include <assert.h>
#include <inttypes.h>
#include <math.h>
#include <signal.h>
#include <stdarg.h>
#include <stdbool.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <syslog.h>
#include <unistd.h>
#if defined(_LIBC)
#include "extern.h"
#define ubsan_vsyslog vsyslog_ss
#define ASSERT(x) _DIAGASSERT(x)
#else
#define ubsan_vsyslog vsyslog_r
#define ASSERT(x) assert(x)
#endif
/* These macros are available in _KERNEL only */
#define SET(t, f) ((t) |= (f))
#define ISSET(t, f) ((t) & (f))
#define CLR(t, f) ((t) &= ~(f))
#endif
#ifdef UBSAN_ALWAYS_FATAL
static const bool alwaysFatal = true;
#else
static const bool alwaysFatal = false;
#endif
#define REINTERPRET_CAST(__dt, __st) ((__dt)(__st))
#define STATIC_CAST(__dt, __st) ((__dt)(__st))
#define ACK_REPORTED __BIT(31)
#define MUL_STRING "*"
#define PLUS_STRING "+"
#define MINUS_STRING "-"
#define DIVREM_STRING "divrem"
#define CFI_VCALL 0
#define CFI_NVCALL 1
#define CFI_DERIVEDCAST 2
#define CFI_UNRELATEDCAST 3
#define CFI_ICALL 4
#define CFI_NVMFCALL 5
#define CFI_VMFCALL 6
#define NUMBER_MAXLEN 128
#define LOCATION_MAXLEN (PATH_MAX + 32 /* ':LINE:COLUMN' */)
#define WIDTH_8 8
#define WIDTH_16 16
#define WIDTH_32 32
#define WIDTH_64 64
#define WIDTH_80 80
#define WIDTH_96 96
#define WIDTH_128 128
#define NUMBER_SIGNED_BIT 1U
#ifdef __SIZEOF_INT128__
typedef __int128 longest;
typedef unsigned __int128 ulongest;
#else
typedef int64_t longest;
typedef uint64_t ulongest;
#endif
#ifndef _KERNEL
static int ubsan_flags = -1;
#define UBSAN_ABORT __BIT(0)
#define UBSAN_STDOUT __BIT(1)
#define UBSAN_STDERR __BIT(2)
#define UBSAN_SYSLOG __BIT(3)
#endif
/* Undefined Behavior specific defines and structures */
#define KIND_INTEGER 0
#define KIND_FLOAT 1
#define KIND_UNKNOWN UINT16_MAX
struct CSourceLocation {
char *mFilename;
uint32_t mLine;
uint32_t mColumn;
};
struct CTypeDescriptor {
uint16_t mTypeKind;
uint16_t mTypeInfo;
uint8_t mTypeName[1];
};
struct COverflowData {
struct CSourceLocation mLocation;
struct CTypeDescriptor *mType;
};
struct CUnreachableData {
struct CSourceLocation mLocation;
};
struct CCFICheckFailData {
uint8_t mCheckKind;
struct CSourceLocation mLocation;
struct CTypeDescriptor *mType;
};
struct CDynamicTypeCacheMissData {
struct CSourceLocation mLocation;
struct CTypeDescriptor *mType;
void *mTypeInfo;
uint8_t mTypeCheckKind;
};
struct CFunctionTypeMismatchData {
struct CSourceLocation mLocation;
struct CTypeDescriptor *mType;
};
struct CInvalidBuiltinData {
struct CSourceLocation mLocation;
uint8_t mKind;
};
struct CInvalidValueData {
struct CSourceLocation mLocation;
struct CTypeDescriptor *mType;
};
struct CNonNullArgData {
struct CSourceLocation mLocation;
struct CSourceLocation mAttributeLocation;
int mArgIndex;
};
struct CNonNullReturnData {
struct CSourceLocation mAttributeLocation;
};
struct COutOfBoundsData {
struct CSourceLocation mLocation;
struct CTypeDescriptor *mArrayType;
struct CTypeDescriptor *mIndexType;
};
struct CPointerOverflowData {
struct CSourceLocation mLocation;
};
struct CShiftOutOfBoundsData {
struct CSourceLocation mLocation;
struct CTypeDescriptor *mLHSType;
struct CTypeDescriptor *mRHSType;
};
struct CTypeMismatchData {
struct CSourceLocation mLocation;
struct CTypeDescriptor *mType;
unsigned long mLogAlignment;
uint8_t mTypeCheckKind;
};
struct CTypeMismatchData_v1 {
struct CSourceLocation mLocation;
struct CTypeDescriptor *mType;
uint8_t mLogAlignment;
uint8_t mTypeCheckKind;
};
struct CVLABoundData {
struct CSourceLocation mLocation;
struct CTypeDescriptor *mType;
};
struct CFloatCastOverflowData {
struct CSourceLocation mLocation; /* This field exists in this struct since 2015 August 11th */
struct CTypeDescriptor *mFromType;
struct CTypeDescriptor *mToType;
};
/* Local utility functions */
static void Report(bool isFatal, const char *pFormat, ...) __printflike(2, 3);
static bool isAlreadyReported(struct CSourceLocation *pLocation);
static size_t zDeserializeTypeWidth(struct CTypeDescriptor *pType);
static void DeserializeLocation(char *pBuffer, size_t zBUfferLength, struct CSourceLocation *pLocation);
#ifdef __SIZEOF_INT128__
static void DeserializeUINT128(char *pBuffer, size_t zBUfferLength, struct CTypeDescriptor *pType, __uint128_t U128);
#endif
static void DeserializeNumberSigned(char *pBuffer, size_t zBUfferLength, struct CTypeDescriptor *pType, longest L);
static void DeserializeNumberUnsigned(char *pBuffer, size_t zBUfferLength, struct CTypeDescriptor *pType, ulongest L);
#ifndef _KERNEL
static void DeserializeFloatOverPointer(char *pBuffer, size_t zBUfferLength, struct CTypeDescriptor *pType, unsigned long *pNumber);
static void DeserializeFloatInlined(char *pBuffer, size_t zBUfferLength, struct CTypeDescriptor *pType, unsigned long ulNumber);
#endif
static longest llliGetNumber(char *szLocation, struct CTypeDescriptor *pType, unsigned long ulNumber);
static ulongest llluGetNumber(char *szLocation, struct CTypeDescriptor *pType, unsigned long ulNumber);
#ifndef _KERNEL
static void DeserializeNumberFloat(char *szLocation, char *pBuffer, size_t zBUfferLength, struct CTypeDescriptor *pType, unsigned long ulNumber);
#endif
static void DeserializeNumber(char *szLocation, char *pBuffer, size_t zBUfferLength, struct CTypeDescriptor *pType, unsigned long ulNumber);
static const char *DeserializeTypeCheckKind(uint8_t hhuTypeCheckKind);
static const char *DeserializeBuiltinCheckKind(uint8_t hhuBuiltinCheckKind);
static const char *DeserializeCFICheckKind(uint8_t hhuCFICheckKind);
static bool isNegativeNumber(char *szLocation, struct CTypeDescriptor *pType, unsigned long ulNumber);
static bool isShiftExponentTooLarge(char *szLocation, struct CTypeDescriptor *pType, unsigned long ulNumber, size_t zWidth);
/* Unused in this implementation, emitted by the C++ check dynamic type cast. */
intptr_t __ubsan_vptr_type_cache[128];
/* Public symbols used in the instrumentation of the code generation part */
void __ubsan_handle_add_overflow(struct COverflowData *pData, unsigned long ulLHS, unsigned long ulRHS);
void __ubsan_handle_add_overflow_abort(struct COverflowData *pData, unsigned long ulLHS, unsigned long ulRHS);
void __ubsan_handle_builtin_unreachable(struct CUnreachableData *pData);
void __ubsan_handle_cfi_bad_type(struct CCFICheckFailData *pData, unsigned long ulVtable, bool bValidVtable, bool FromUnrecoverableHandler, unsigned long ProgramCounter, unsigned long FramePointer);
void __ubsan_handle_cfi_check_fail(struct CCFICheckFailData *pData, unsigned long ulValue, unsigned long ulValidVtable);
void __ubsan_handle_cfi_check_fail_abort(struct CCFICheckFailData *pData, unsigned long ulValue, unsigned long ulValidVtable);
void __ubsan_handle_divrem_overflow(struct COverflowData *pData, unsigned long ulLHS, unsigned long ulRHS);
void __ubsan_handle_divrem_overflow_abort(struct COverflowData *pData, unsigned long ulLHS, unsigned long ulRHS);
void __ubsan_handle_dynamic_type_cache_miss(struct CDynamicTypeCacheMissData *pData, unsigned long ulPointer, unsigned long ulHash);
void __ubsan_handle_dynamic_type_cache_miss_abort(struct CDynamicTypeCacheMissData *pData, unsigned long ulPointer, unsigned long ulHash);
void __ubsan_handle_float_cast_overflow(struct CFloatCastOverflowData *pData, unsigned long ulFrom);
void __ubsan_handle_float_cast_overflow_abort(struct CFloatCastOverflowData *pData, unsigned long ulFrom);
void __ubsan_handle_function_type_mismatch(struct CFunctionTypeMismatchData *pData, unsigned long ulFunction);
void __ubsan_handle_function_type_mismatch_abort(struct CFunctionTypeMismatchData *pData, unsigned long ulFunction);
void __ubsan_handle_invalid_builtin(struct CInvalidBuiltinData *pData);
void __ubsan_handle_invalid_builtin_abort(struct CInvalidBuiltinData *pData);
void __ubsan_handle_load_invalid_value(struct CInvalidValueData *pData, unsigned long ulVal);
void __ubsan_handle_load_invalid_value_abort(struct CInvalidValueData *pData, unsigned long ulVal);
void __ubsan_handle_missing_return(struct CUnreachableData *pData);
void __ubsan_handle_mul_overflow(struct COverflowData *pData, unsigned long ulLHS, unsigned long ulRHS);
void __ubsan_handle_mul_overflow_abort(struct COverflowData *pData, unsigned long ulLHS, unsigned long ulRHS);
void __ubsan_handle_negate_overflow(struct COverflowData *pData, unsigned long ulOldVal);
void __ubsan_handle_negate_overflow_abort(struct COverflowData *pData, unsigned long ulOldVal);
void __ubsan_handle_nonnull_arg(struct CNonNullArgData *pData);
void __ubsan_handle_nonnull_arg_abort(struct CNonNullArgData *pData);
void __ubsan_handle_nonnull_return_v1(struct CNonNullReturnData *pData, struct CSourceLocation *pLocationPointer);
void __ubsan_handle_nonnull_return_v1_abort(struct CNonNullReturnData *pData, struct CSourceLocation *pLocationPointer);
void __ubsan_handle_nullability_arg(struct CNonNullArgData *pData);
void __ubsan_handle_nullability_arg_abort(struct CNonNullArgData *pData);
void __ubsan_handle_nullability_return_v1(struct CNonNullReturnData *pData, struct CSourceLocation *pLocationPointer);
void __ubsan_handle_nullability_return_v1_abort(struct CNonNullReturnData *pData, struct CSourceLocation *pLocationPointer);
void __ubsan_handle_out_of_bounds(struct COutOfBoundsData *pData, unsigned long ulIndex);
void __ubsan_handle_out_of_bounds_abort(struct COutOfBoundsData *pData, unsigned long ulIndex);
void __ubsan_handle_pointer_overflow(struct CPointerOverflowData *pData, unsigned long ulBase, unsigned long ulResult);
void __ubsan_handle_pointer_overflow_abort(struct CPointerOverflowData *pData, unsigned long ulBase, unsigned long ulResult);
void __ubsan_handle_shift_out_of_bounds(struct CShiftOutOfBoundsData *pData, unsigned long ulLHS, unsigned long ulRHS);
void __ubsan_handle_shift_out_of_bounds_abort(struct CShiftOutOfBoundsData *pData, unsigned long ulLHS, unsigned long ulRHS);
void __ubsan_handle_sub_overflow(struct COverflowData *pData, unsigned long ulLHS, unsigned long ulRHS);
void __ubsan_handle_sub_overflow_abort(struct COverflowData *pData, unsigned long ulLHS, unsigned long ulRHS);
void __ubsan_handle_type_mismatch(struct CTypeMismatchData *pData, unsigned long ulPointer);
void __ubsan_handle_type_mismatch_abort(struct CTypeMismatchData *pData, unsigned long ulPointer);
void __ubsan_handle_type_mismatch_v1(struct CTypeMismatchData_v1 *pData, unsigned long ulPointer);
void __ubsan_handle_type_mismatch_v1_abort(struct CTypeMismatchData_v1 *pData, unsigned long ulPointer);
void __ubsan_handle_vla_bound_not_positive(struct CVLABoundData *pData, unsigned long ulBound);
void __ubsan_handle_vla_bound_not_positive_abort(struct CVLABoundData *pData, unsigned long ulBound);
void __ubsan_get_current_report_data(const char **ppOutIssueKind, const char **ppOutMessage, const char **ppOutFilename, uint32_t *pOutLine, uint32_t *pOutCol, char **ppOutMemoryAddr);
static void HandleOverflow(bool isFatal, struct COverflowData *pData, unsigned long ulLHS, unsigned long ulRHS, const char *szOperation);
static void HandleNegateOverflow(bool isFatal, struct COverflowData *pData, unsigned long ulOldValue);
static void HandleBuiltinUnreachable(bool isFatal, struct CUnreachableData *pData);
static void HandleTypeMismatch(bool isFatal, struct CSourceLocation *mLocation, struct CTypeDescriptor *mType, unsigned long mLogAlignment, uint8_t mTypeCheckKind, unsigned long ulPointer);
static void HandleVlaBoundNotPositive(bool isFatal, struct CVLABoundData *pData, unsigned long ulBound);
static void HandleOutOfBounds(bool isFatal, struct COutOfBoundsData *pData, unsigned long ulIndex);
static void HandleShiftOutOfBounds(bool isFatal, struct CShiftOutOfBoundsData *pData, unsigned long ulLHS, unsigned long ulRHS);
static void HandleLoadInvalidValue(bool isFatal, struct CInvalidValueData *pData, unsigned long ulValue);
static void HandleInvalidBuiltin(bool isFatal, struct CInvalidBuiltinData *pData);
static void HandleFunctionTypeMismatch(bool isFatal, struct CFunctionTypeMismatchData *pData, unsigned long ulFunction);
static void HandleCFIBadType(bool isFatal, struct CCFICheckFailData *pData, unsigned long ulVtable, bool *bValidVtable, bool *FromUnrecoverableHandler, unsigned long *ProgramCounter, unsigned long *FramePointer);
static void HandleDynamicTypeCacheMiss(bool isFatal, struct CDynamicTypeCacheMissData *pData, unsigned long ulPointer, unsigned long ulHash);
static void HandleFloatCastOverflow(bool isFatal, struct CFloatCastOverflowData *pData, unsigned long ulFrom);
static void HandleMissingReturn(bool isFatal, struct CUnreachableData *pData);
static void HandleNonnullArg(bool isFatal, struct CNonNullArgData *pData);
static void HandleNonnullReturn(bool isFatal, struct CNonNullReturnData *pData, struct CSourceLocation *pLocationPointer);
static void HandlePointerOverflow(bool isFatal, struct CPointerOverflowData *pData, unsigned long ulBase, unsigned long ulResult);
static void
HandleOverflow(bool isFatal, struct COverflowData *pData, unsigned long ulLHS, unsigned long ulRHS, const char *szOperation)
{
char szLocation[LOCATION_MAXLEN];
char szLHS[NUMBER_MAXLEN];
char szRHS[NUMBER_MAXLEN];
ASSERT(pData);
if (isAlreadyReported(&pData->mLocation))
return;
DeserializeLocation(szLocation, LOCATION_MAXLEN, &pData->mLocation);
DeserializeNumber(szLocation, szLHS, NUMBER_MAXLEN, pData->mType, ulLHS);
DeserializeNumber(szLocation, szRHS, NUMBER_MAXLEN, pData->mType, ulRHS);
Report(isFatal, "UBSan: Undefined Behavior in %s, %s integer overflow: %s %s %s cannot be represented in type %s\n",
szLocation, ISSET(pData->mType->mTypeInfo, NUMBER_SIGNED_BIT) ? "signed" : "unsigned", szLHS, szOperation, szRHS, pData->mType->mTypeName);
}
static void
HandleNegateOverflow(bool isFatal, struct COverflowData *pData, unsigned long ulOldValue)
{
char szLocation[LOCATION_MAXLEN];
char szOldValue[NUMBER_MAXLEN];
ASSERT(pData);
if (isAlreadyReported(&pData->mLocation))
return;
DeserializeLocation(szLocation, LOCATION_MAXLEN, &pData->mLocation);
DeserializeNumber(szLocation, szOldValue, NUMBER_MAXLEN, pData->mType, ulOldValue);
Report(isFatal, "UBSan: Undefined Behavior in %s, negation of %s cannot be represented in type %s\n",
szLocation, szOldValue, pData->mType->mTypeName);
}
static void
HandleBuiltinUnreachable(bool isFatal, struct CUnreachableData *pData)
{
char szLocation[LOCATION_MAXLEN];
ASSERT(pData);
if (isAlreadyReported(&pData->mLocation))
return;
DeserializeLocation(szLocation, LOCATION_MAXLEN, &pData->mLocation);
Report(isFatal, "UBSan: Undefined Behavior in %s, calling __builtin_unreachable()\n",
szLocation);
}
static void
HandleTypeMismatch(bool isFatal, struct CSourceLocation *mLocation, struct CTypeDescriptor *mType, unsigned long mLogAlignment, uint8_t mTypeCheckKind, unsigned long ulPointer)
{
char szLocation[LOCATION_MAXLEN];
ASSERT(mLocation);
ASSERT(mType);
if (isAlreadyReported(mLocation))
return;
DeserializeLocation(szLocation, LOCATION_MAXLEN, mLocation);
if (ulPointer == 0) {
Report(isFatal, "UBSan: Undefined Behavior in %s, %s null pointer of type %s\n",
szLocation, DeserializeTypeCheckKind(mTypeCheckKind), mType->mTypeName);
} else if ((mLogAlignment - 1) & ulPointer) {
Report(isFatal, "UBSan: Undefined Behavior in %s, %s misaligned address %p for type %s which requires %ld byte alignment\n",
szLocation, DeserializeTypeCheckKind(mTypeCheckKind), REINTERPRET_CAST(void *, ulPointer), mType->mTypeName, mLogAlignment);
} else {
Report(isFatal, "UBSan: Undefined Behavior in %s, %s address %p with insufficient space for an object of type %s\n",
szLocation, DeserializeTypeCheckKind(mTypeCheckKind), REINTERPRET_CAST(void *, ulPointer), mType->mTypeName);
}
}
static void
HandleVlaBoundNotPositive(bool isFatal, struct CVLABoundData *pData, unsigned long ulBound)
{
char szLocation[LOCATION_MAXLEN];
char szBound[NUMBER_MAXLEN];
ASSERT(pData);
if (isAlreadyReported(&pData->mLocation))
return;
DeserializeLocation(szLocation, LOCATION_MAXLEN, &pData->mLocation);
DeserializeNumber(szLocation, szBound, NUMBER_MAXLEN, pData->mType, ulBound);
Report(isFatal, "UBSan: Undefined Behavior in %s, variable length array bound value %s <= 0\n",
szLocation, szBound);
}
static void
HandleOutOfBounds(bool isFatal, struct COutOfBoundsData *pData, unsigned long ulIndex)
{
char szLocation[LOCATION_MAXLEN];
char szIndex[NUMBER_MAXLEN];
ASSERT(pData);
if (isAlreadyReported(&pData->mLocation))
return;
DeserializeLocation(szLocation, LOCATION_MAXLEN, &pData->mLocation);
DeserializeNumber(szLocation, szIndex, NUMBER_MAXLEN, pData->mIndexType, ulIndex);
Report(isFatal, "UBSan: Undefined Behavior in %s, index %s is out of range for type %s\n",
szLocation, szIndex, pData->mArrayType->mTypeName);
}
static void
HandleShiftOutOfBounds(bool isFatal, struct CShiftOutOfBoundsData *pData, unsigned long ulLHS, unsigned long ulRHS)
{
char szLocation[LOCATION_MAXLEN];
char szLHS[NUMBER_MAXLEN];
char szRHS[NUMBER_MAXLEN];
ASSERT(pData);
if (isAlreadyReported(&pData->mLocation))
return;
DeserializeLocation(szLocation, LOCATION_MAXLEN, &pData->mLocation);
DeserializeNumber(szLocation, szLHS, NUMBER_MAXLEN, pData->mLHSType, ulLHS);
DeserializeNumber(szLocation, szRHS, NUMBER_MAXLEN, pData->mRHSType, ulRHS);
if (isNegativeNumber(szLocation, pData->mRHSType, ulRHS))
Report(isFatal, "UBSan: Undefined Behavior in %s, shift exponent %s is negative\n",
szLocation, szRHS);
else if (isShiftExponentTooLarge(szLocation, pData->mRHSType, ulRHS, zDeserializeTypeWidth(pData->mLHSType)))
Report(isFatal, "UBSan: Undefined Behavior in %s, shift exponent %s is too large for %zu-bit type %s\n",
szLocation, szRHS, zDeserializeTypeWidth(pData->mLHSType), pData->mLHSType->mTypeName);
else if (isNegativeNumber(szLocation, pData->mLHSType, ulLHS))
Report(isFatal, "UBSan: Undefined Behavior in %s, left shift of negative value %s\n",
szLocation, szLHS);
else
Report(isFatal, "UBSan: Undefined Behavior in %s, left shift of %s by %s places cannot be represented in type %s\n",
szLocation, szLHS, szRHS, pData->mLHSType->mTypeName);
}
static void
HandleLoadInvalidValue(bool isFatal, struct CInvalidValueData *pData, unsigned long ulValue)
{
char szLocation[LOCATION_MAXLEN];
char szValue[NUMBER_MAXLEN];
ASSERT(pData);
if (isAlreadyReported(&pData->mLocation))
return;
DeserializeLocation(szLocation, LOCATION_MAXLEN, &pData->mLocation);
DeserializeNumber(szLocation, szValue, NUMBER_MAXLEN, pData->mType, ulValue);
Report(isFatal, "UBSan: Undefined Behavior in %s, load of value %s is not a valid value for type %s\n",
szLocation, szValue, pData->mType->mTypeName);
}
static void
HandleInvalidBuiltin(bool isFatal, struct CInvalidBuiltinData *pData)
{
char szLocation[LOCATION_MAXLEN];
ASSERT(pData);
if (isAlreadyReported(&pData->mLocation))
return;
DeserializeLocation(szLocation, LOCATION_MAXLEN, &pData->mLocation);
Report(isFatal, "UBSan: Undefined Behavior in %s, passing zero to %s, which is not a valid argument\n",
szLocation, DeserializeBuiltinCheckKind(pData->mKind));
}
static void
HandleFunctionTypeMismatch(bool isFatal, struct CFunctionTypeMismatchData *pData, unsigned long ulFunction)
{
char szLocation[LOCATION_MAXLEN];
/*
* There is no a portable C solution to translate an address of a
* function to its name. On the cost of getting this routine simple
* and portable without ifdefs between the userland and the kernel
* just print the address of the function as-is.
*
* For better diagnostic messages in the userland, users shall use
* the full upstream version shipped along with the compiler toolchain.
*/
ASSERT(pData);
if (isAlreadyReported(&pData->mLocation))
return;
DeserializeLocation(szLocation, LOCATION_MAXLEN, &pData->mLocation);
Report(isFatal, "UBSan: Undefined Behavior in %s, call to function %#lx through pointer to incorrect function type %s\n",
szLocation, ulFunction, pData->mType->mTypeName);
}
static void
HandleCFIBadType(bool isFatal, struct CCFICheckFailData *pData, unsigned long ulVtable, bool *bValidVtable, bool *FromUnrecoverableHandler, unsigned long *ProgramCounter, unsigned long *FramePointer)
{
char szLocation[LOCATION_MAXLEN];
/*
* This is a minimal implementation without diving into C++
* specifics and (Itanium) ABI deserialization.
*/
ASSERT(pData);
if (isAlreadyReported(&pData->mLocation))
return;
DeserializeLocation(szLocation, LOCATION_MAXLEN, &pData->mLocation);
if (pData->mCheckKind == CFI_ICALL || pData->mCheckKind == CFI_VMFCALL) {
Report(isFatal, "UBSan: Undefined Behavior in %s, control flow integrity check for type %s failed during %s (vtable address %#lx)\n",
szLocation, pData->mType->mTypeName, DeserializeCFICheckKind(pData->mCheckKind), ulVtable);
} else {
Report(isFatal || FromUnrecoverableHandler, "UBSan: Undefined Behavior in %s, control flow integrity check for type %s failed during %s (vtable address %#lx; %s vtable; from %s handler; Program Counter %#lx; Frame Pointer %#lx)\n",
szLocation, pData->mType->mTypeName, DeserializeCFICheckKind(pData->mCheckKind), ulVtable, *bValidVtable ? "valid" : "invalid", *FromUnrecoverableHandler ? "unrecoverable" : "recoverable", *ProgramCounter, *FramePointer);
}
}
static void
HandleDynamicTypeCacheMiss(bool isFatal, struct CDynamicTypeCacheMissData *pData, unsigned long ulPointer, unsigned long ulHash)
{
#if 0
char szLocation[LOCATION_MAXLEN];
/*
* Unimplemented.
*
* This UBSan handler is special as the check has to be impelemented
* in an implementation. In order to handle it there is need to
* introspect into C++ ABI internals (RTTI) and use low-level
* C++ runtime interfaces.
*/
ASSERT(pData);
if (isAlreadyReported(&pData->mLocation))
return;
DeserializeLocation(szLocation, LOCATION_MAXLEN, &pData->mLocation);
Report(isFatal, "UBSan: Undefined Behavior in %s, %s address %#lx which might not point to an object of type %s\n"
szLocation, DeserializeTypeCheckKind(pData->mTypeCheckKind), ulPointer, pData->mType);
#endif
}
static void
HandleFloatCastOverflow(bool isFatal, struct CFloatCastOverflowData *pData, unsigned long ulFrom)
{
char szLocation[LOCATION_MAXLEN];
char szFrom[NUMBER_MAXLEN];
ASSERT(pData);
if (isAlreadyReported(&pData->mLocation))
return;
DeserializeLocation(szLocation, LOCATION_MAXLEN, &pData->mLocation);
DeserializeNumber(szLocation, szFrom, NUMBER_MAXLEN, pData->mFromType, ulFrom);
Report(isFatal, "UBSan: Undefined Behavior in %s, %s (of type %s) is outside the range of representable values of type %s\n",
szLocation, szFrom, pData->mFromType->mTypeName, pData->mToType->mTypeName);
}
static void
HandleMissingReturn(bool isFatal, struct CUnreachableData *pData)
{
char szLocation[LOCATION_MAXLEN];
ASSERT(pData);
if (isAlreadyReported(&pData->mLocation))
return;
DeserializeLocation(szLocation, LOCATION_MAXLEN, &pData->mLocation);
Report(isFatal, "UBSan: Undefined Behavior in %s, execution reached the end of a value-returning function without returning a value\n",
szLocation);
}
static void
HandleNonnullArg(bool isFatal, struct CNonNullArgData *pData)
{
char szLocation[LOCATION_MAXLEN];
char szAttributeLocation[LOCATION_MAXLEN];
ASSERT(pData);
if (isAlreadyReported(&pData->mLocation))
return;
DeserializeLocation(szLocation, LOCATION_MAXLEN, &pData->mLocation);
if (pData->mAttributeLocation.mFilename)
DeserializeLocation(szAttributeLocation, LOCATION_MAXLEN, &pData->mAttributeLocation);
else
szAttributeLocation[0] = '\0';
Report(isFatal, "UBSan: Undefined Behavior in %s, null pointer passed as argument %d, which is declared to never be null%s%s\n",
szLocation, pData->mArgIndex, pData->mAttributeLocation.mFilename ? ", nonnull/_Nonnull specified in " : "", szAttributeLocation);
}
static void
HandleNonnullReturn(bool isFatal, struct CNonNullReturnData *pData, struct CSourceLocation *pLocationPointer)
{
char szLocation[LOCATION_MAXLEN];
char szAttributeLocation[LOCATION_MAXLEN];
ASSERT(pData);
ASSERT(pLocationPointer);
if (isAlreadyReported(pLocationPointer))
return;
DeserializeLocation(szLocation, LOCATION_MAXLEN, pLocationPointer);
if (pData->mAttributeLocation.mFilename)
DeserializeLocation(szAttributeLocation, LOCATION_MAXLEN, &pData->mAttributeLocation);
else
szAttributeLocation[0] = '\0';
Report(isFatal, "UBSan: Undefined Behavior in %s, null pointer returned from function declared to never return null%s%s\n",
szLocation, pData->mAttributeLocation.mFilename ? ", nonnull/_Nonnull specified in " : "", szAttributeLocation);
}
static void
HandlePointerOverflow(bool isFatal, struct CPointerOverflowData *pData, unsigned long ulBase, unsigned long ulResult)
{
char szLocation[LOCATION_MAXLEN];
ASSERT(pData);
if (isAlreadyReported(&pData->mLocation))
return;
DeserializeLocation(szLocation, LOCATION_MAXLEN, &pData->mLocation);
Report(isFatal, "UBSan: Undefined Behavior in %s, pointer expression with base %#lx overflowed to %#lx\n",
szLocation, ulBase, ulResult);
}
/* Definions of public symbols emitted by the instrumentation code */
void
__ubsan_handle_add_overflow(struct COverflowData *pData, unsigned long ulLHS, unsigned long ulRHS)
{
ASSERT(pData);
HandleOverflow(false, pData, ulLHS, ulRHS, PLUS_STRING);
}
void
__ubsan_handle_add_overflow_abort(struct COverflowData *pData, unsigned long ulLHS, unsigned long ulRHS)
{
ASSERT(pData);
HandleOverflow(true, pData, ulLHS, ulRHS, PLUS_STRING);
}
void
__ubsan_handle_builtin_unreachable(struct CUnreachableData *pData)
{
ASSERT(pData);
HandleBuiltinUnreachable(true, pData);
}
void
__ubsan_handle_cfi_bad_type(struct CCFICheckFailData *pData, unsigned long ulVtable, bool bValidVtable, bool FromUnrecoverableHandler, unsigned long ProgramCounter, unsigned long FramePointer)
{
ASSERT(pData);
HandleCFIBadType(false, pData, ulVtable, &bValidVtable, &FromUnrecoverableHandler, &ProgramCounter, &FramePointer);
}
void
__ubsan_handle_cfi_check_fail(struct CCFICheckFailData *pData, unsigned long ulValue, unsigned long ulValidVtable)
{
ASSERT(pData);
HandleCFIBadType(false, pData, ulValue, 0, 0, 0, 0);
}
void
__ubsan_handle_cfi_check_fail_abort(struct CCFICheckFailData *pData, unsigned long ulValue, unsigned long ulValidVtable)
{
ASSERT(pData);
HandleCFIBadType(true, pData, ulValue, 0, 0, 0, 0);
}
void
__ubsan_handle_divrem_overflow(struct COverflowData *pData, unsigned long ulLHS, unsigned long ulRHS)
{
ASSERT(pData);
HandleOverflow(false, pData, ulLHS, ulRHS, DIVREM_STRING);
}
void
__ubsan_handle_divrem_overflow_abort(struct COverflowData *pData, unsigned long ulLHS, unsigned long ulRHS)
{
ASSERT(pData);
HandleOverflow(true, pData, ulLHS, ulRHS, DIVREM_STRING);
}
void
__ubsan_handle_dynamic_type_cache_miss(struct CDynamicTypeCacheMissData *pData, unsigned long ulPointer, unsigned long ulHash)
{
ASSERT(pData);
HandleDynamicTypeCacheMiss(false, pData, ulPointer, ulHash);
}
void
__ubsan_handle_dynamic_type_cache_miss_abort(struct CDynamicTypeCacheMissData *pData, unsigned long ulPointer, unsigned long ulHash)
{
ASSERT(pData);
HandleDynamicTypeCacheMiss(false, pData, ulPointer, ulHash);
}
void
__ubsan_handle_float_cast_overflow(struct CFloatCastOverflowData *pData, unsigned long ulFrom)
{
ASSERT(pData);
HandleFloatCastOverflow(false, pData, ulFrom);
}
void
__ubsan_handle_float_cast_overflow_abort(struct CFloatCastOverflowData *pData, unsigned long ulFrom)
{
ASSERT(pData);
HandleFloatCastOverflow(true, pData, ulFrom);
}
void
__ubsan_handle_function_type_mismatch(struct CFunctionTypeMismatchData *pData, unsigned long ulFunction)
{
ASSERT(pData);
HandleFunctionTypeMismatch(false, pData, ulFunction);
}
void
__ubsan_handle_function_type_mismatch_abort(struct CFunctionTypeMismatchData *pData, unsigned long ulFunction)
{
ASSERT(pData);
HandleFunctionTypeMismatch(false, pData, ulFunction);
}
void
__ubsan_handle_invalid_builtin(struct CInvalidBuiltinData *pData)
{
ASSERT(pData);
HandleInvalidBuiltin(true, pData);
}
void
__ubsan_handle_invalid_builtin_abort(struct CInvalidBuiltinData *pData)
{
ASSERT(pData);
HandleInvalidBuiltin(true, pData);
}
void
__ubsan_handle_load_invalid_value(struct CInvalidValueData *pData, unsigned long ulValue)
{
ASSERT(pData);
HandleLoadInvalidValue(false, pData, ulValue);
}
void
__ubsan_handle_load_invalid_value_abort(struct CInvalidValueData *pData, unsigned long ulValue)
{
ASSERT(pData);
HandleLoadInvalidValue(true, pData, ulValue);
}
void
__ubsan_handle_missing_return(struct CUnreachableData *pData)
{
ASSERT(pData);
HandleMissingReturn(true, pData);
}
void
__ubsan_handle_mul_overflow(struct COverflowData *pData, unsigned long ulLHS, unsigned long ulRHS)
{
ASSERT(pData);
HandleOverflow(false, pData, ulLHS, ulRHS, MUL_STRING);
}
void
__ubsan_handle_mul_overflow_abort(struct COverflowData *pData, unsigned long ulLHS, unsigned long ulRHS)
{
ASSERT(pData);
HandleOverflow(true, pData, ulLHS, ulRHS, MUL_STRING);
}
void
__ubsan_handle_negate_overflow(struct COverflowData *pData, unsigned long ulOldValue)
{
ASSERT(pData);
HandleNegateOverflow(false, pData, ulOldValue);
}
void
__ubsan_handle_negate_overflow_abort(struct COverflowData *pData, unsigned long ulOldValue)
{
ASSERT(pData);
HandleNegateOverflow(true, pData, ulOldValue);
}
void
__ubsan_handle_nonnull_arg(struct CNonNullArgData *pData)
{
ASSERT(pData);
HandleNonnullArg(false, pData);
}
void
__ubsan_handle_nonnull_arg_abort(struct CNonNullArgData *pData)
{
ASSERT(pData);
HandleNonnullArg(true, pData);
}
void
__ubsan_handle_nonnull_return_v1(struct CNonNullReturnData *pData, struct CSourceLocation *pLocationPointer)
{
ASSERT(pData);
ASSERT(pLocationPointer);
HandleNonnullReturn(false, pData, pLocationPointer);
}
void
__ubsan_handle_nonnull_return_v1_abort(struct CNonNullReturnData *pData, struct CSourceLocation *pLocationPointer)
{
ASSERT(pData);
ASSERT(pLocationPointer);
HandleNonnullReturn(true, pData, pLocationPointer);
}
void
__ubsan_handle_nullability_arg(struct CNonNullArgData *pData)
{
ASSERT(pData);
HandleNonnullArg(false, pData);
}
void
__ubsan_handle_nullability_arg_abort(struct CNonNullArgData *pData)
{
ASSERT(pData);
HandleNonnullArg(true, pData);
}
void
__ubsan_handle_nullability_return_v1(struct CNonNullReturnData *pData, struct CSourceLocation *pLocationPointer)
{
ASSERT(pData);
ASSERT(pLocationPointer);
HandleNonnullReturn(false, pData, pLocationPointer);
}
void
__ubsan_handle_nullability_return_v1_abort(struct CNonNullReturnData *pData, struct CSourceLocation *pLocationPointer)
{
ASSERT(pData);
ASSERT(pLocationPointer);
HandleNonnullReturn(true, pData, pLocationPointer);
}
void
__ubsan_handle_out_of_bounds(struct COutOfBoundsData *pData, unsigned long ulIndex)
{
ASSERT(pData);
HandleOutOfBounds(false, pData, ulIndex);
}
void
__ubsan_handle_out_of_bounds_abort(struct COutOfBoundsData *pData, unsigned long ulIndex)
{
ASSERT(pData);
HandleOutOfBounds(true, pData, ulIndex);
}
void
__ubsan_handle_pointer_overflow(struct CPointerOverflowData *pData, unsigned long ulBase, unsigned long ulResult)
{
ASSERT(pData);
HandlePointerOverflow(false, pData, ulBase, ulResult);
}
void
__ubsan_handle_pointer_overflow_abort(struct CPointerOverflowData *pData, unsigned long ulBase, unsigned long ulResult)
{