-
Notifications
You must be signed in to change notification settings - Fork 9
/
dyld2.cpp
7411 lines (6686 loc) · 262 KB
/
dyld2.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
/* -*- mode: C++; c-basic-offset: 4; tab-width: 4 -*-
*
* Copyright (c) 2004-2013 Apple Inc. All rights reserved.
*
* @APPLE_LICENSE_HEADER_START@
*
* This file contains Original Code and/or Modifications of Original Code
* as defined in and that are subject to the Apple Public Source License
* Version 2.0 (the 'License'). You may not use this file except in
* compliance with the License. Please obtain a copy of the License at
* http://www.opensource.apple.com/apsl/ and read it before using this
* file.
*
* The Original Code and all software distributed under the License are
* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
* Please see the License for the specific language governing rights and
* limitations under the License.
*
* @APPLE_LICENSE_HEADER_END@
*/
#include <stdint.h>
#include <string.h>
#include <unistd.h>
#include <errno.h>
#include <fcntl.h>
#include <stdlib.h>
#include <dirent.h>
#include <pthread.h>
#include <libproc.h>
#include <sys/param.h>
#include <mach/mach_time.h> // mach_absolute_time()
#include <mach/mach_init.h>
#include <mach/mach_traps.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/syscall.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <sys/syslog.h>
#include <sys/uio.h>
#include <sys/xattr.h>
#include <mach/mach.h>
#include <mach-o/fat.h>
#include <mach-o/loader.h>
#include <mach-o/ldsyms.h>
#include <libkern/OSByteOrder.h>
#include <libkern/OSAtomic.h>
#include <sys/sysctl.h>
#include <sys/mman.h>
#include <sys/dtrace.h>
#include <libkern/OSAtomic.h>
#include <Availability.h>
#include <System/sys/codesign.h>
#include <System/sys/csr.h>
#include <_simple.h>
#include <os/lock_private.h>
#include <System/machine/cpu_capabilities.h>
#include <System/sys/reason.h>
#include <kern/kcdata.h>
#include <sys/attr.h>
#include <sys/fsgetpath.h>
#include <System/sys/content_protection.h>
#define SUPPORT_LOGGING_TO_CONSOLE !TARGET_OS_SIMULATOR
#if SUPPORT_LOGGING_TO_CONSOLE
#include <paths.h> // for logging to console
#endif
#if !TARGET_OS_SIMULATOR
// The comm page is being renamed, so set our define to the new value if the old
// value is missing
#ifndef _COMM_PAGE_DYLD_SYSTEM_FLAGS
#ifndef _COMM_PAGE_DYLD_FLAGS
#error Must define _COMM_PAGE_DYLD_FLAGS or _COMM_PAGE_DYLD_SYSTEM_FLAGS
#endif
#define _COMM_PAGE_DYLD_SYSTEM_FLAGS _COMM_PAGE_DYLD_FLAGS
#endif
#endif
#if TARGET_OS_SIMULATOR
enum {
AMFI_DYLD_INPUT_PROC_IN_SIMULATOR = (1 << 0),
};
enum amfi_dyld_policy_output_flag_set {
AMFI_DYLD_OUTPUT_ALLOW_AT_PATH = (1 << 0),
AMFI_DYLD_OUTPUT_ALLOW_PATH_VARS = (1 << 1),
AMFI_DYLD_OUTPUT_ALLOW_CUSTOM_SHARED_CACHE = (1 << 2),
AMFI_DYLD_OUTPUT_ALLOW_FALLBACK_PATHS = (1 << 3),
AMFI_DYLD_OUTPUT_ALLOW_PRINT_VARS = (1 << 4),
AMFI_DYLD_OUTPUT_ALLOW_FAILED_LIBRARY_INSERTION = (1 << 5),
AMFI_DYLD_OUTPUT_ALLOW_LIBRARY_INTERPOSING = (1 << 6),
};
extern "C" int amfi_check_dyld_policy_self(uint64_t input_flags, uint64_t* output_flags);
#else
#include <libamfi.h>
#endif
#include <sandbox.h>
#include <sandbox/private.h>
#if __has_feature(ptrauth_calls)
#include <ptrauth.h>
#endif
extern "C" int __fork();
#include <array>
#include <algorithm>
#include <vector>
#include "dyld2.h"
#include "ImageLoader.h"
#include "ImageLoaderMachO.h"
#include "dyldLibSystemInterface.h"
#include "dyld_cache_format.h"
#include "dyld_process_info_internal.h"
#if SUPPORT_ACCELERATE_TABLES
#include "ImageLoaderMegaDylib.h"
#endif
#if TARGET_OS_SIMULATOR
extern "C" void* gSyscallHelpers;
#else
#include "dyldSyscallInterface.h"
#endif
#include "Closure.h"
#include "libdyldEntryVector.h"
#include "MachOLoaded.h"
#include "Loading.h"
#include "DyldSharedCache.h"
#include "SharedCacheRuntime.h"
#include "StringUtils.h"
#include "Tracing.h"
#include "ClosureBuilder.h"
#include "ClosureFileSystemPhysical.h"
#include "FileUtils.h"
#include "BootArgs.h"
#include "Defines.h"
#include "RootsChecker.h"
#ifndef MH_HAS_OBJC
#define MH_HAS_OBJC 0x40000000
#endif
// not libc header for send() syscall interface
extern "C" ssize_t __sendto(int, const void *, size_t, int, const struct sockaddr *, socklen_t);
// ARM and x86_64 are the only architecture that use cpu-sub-types
#define CPU_SUBTYPES_SUPPORTED ((__arm__ || __arm64__ || __x86_64__) && !TARGET_OS_SIMULATOR)
#if __LP64__
#define LC_SEGMENT_COMMAND LC_SEGMENT_64
#define LC_SEGMENT_COMMAND_WRONG LC_SEGMENT
#define LC_ENCRYPT_COMMAND LC_ENCRYPTION_INFO
#define macho_segment_command segment_command_64
#define macho_section section_64
#else
#define LC_SEGMENT_COMMAND LC_SEGMENT
#define LC_SEGMENT_COMMAND_WRONG LC_SEGMENT_64
#define LC_ENCRYPT_COMMAND LC_ENCRYPTION_INFO_64
#define macho_segment_command segment_command
#define macho_section section
#endif
#define DYLD_CLOSURE_XATTR_NAME "com.apple.dyld"
#define CPU_TYPE_MASK 0x00FFFFFF /* complement of CPU_ARCH_MASK */
/* implemented in dyld_gdb.cpp */
extern void resetAllImages();
extern void addImagesToAllImages(uint32_t infoCount, const dyld_image_info info[]);
extern void addAotImagesToAllAotImages(uint32_t aotInfoCount, const dyld_aot_image_info aotInfo[]);
extern void removeImageFromAllImages(const mach_header* mh);
extern void addNonSharedCacheImageUUID(const dyld_uuid_info& info);
extern const char* notifyGDB(enum dyld_image_states state, uint32_t infoCount, const dyld_image_info info[]);
extern size_t allImagesCount();
// magic so CrashReporter logs message
extern "C" {
char error_string[1024];
}
// magic linker symbol for start of dyld binary
extern "C" const macho_header __dso_handle;
extern bool gEnableSharedCacheDataConst;
//
// The file contains the core of dyld used to get a process to main().
// The API's that dyld supports are implemented in dyldAPIs.cpp.
//
//
//
//
//
namespace dyld {
struct RegisteredDOF { const mach_header* mh; int registrationID; };
struct DylibOverride { const char* installName; const char* override; };
}
VECTOR_NEVER_DESTRUCTED(ImageLoader*);
VECTOR_NEVER_DESTRUCTED(dyld::RegisteredDOF);
VECTOR_NEVER_DESTRUCTED(dyld::ImageCallback);
VECTOR_NEVER_DESTRUCTED(dyld::DylibOverride);
VECTOR_NEVER_DESTRUCTED(ImageLoader::DynamicReference);
VECTOR_NEVER_DESTRUCTED(dyld_image_state_change_handler);
namespace dyld {
//
// state of all environment variables dyld uses
//
struct EnvironmentVariables {
const char* const * DYLD_FRAMEWORK_PATH;
const char* const * DYLD_FALLBACK_FRAMEWORK_PATH;
const char* const * DYLD_LIBRARY_PATH;
const char* const * DYLD_FALLBACK_LIBRARY_PATH;
const char* const * DYLD_INSERT_LIBRARIES;
const char* const * LD_LIBRARY_PATH; // for unix conformance
const char* const * DYLD_VERSIONED_LIBRARY_PATH;
const char* const * DYLD_VERSIONED_FRAMEWORK_PATH;
bool DYLD_PRINT_LIBRARIES_POST_LAUNCH;
bool DYLD_BIND_AT_LAUNCH;
bool DYLD_PRINT_STATISTICS;
bool DYLD_PRINT_STATISTICS_DETAILS;
bool DYLD_PRINT_OPTS;
bool DYLD_PRINT_ENV;
bool DYLD_DISABLE_DOFS;
bool hasOverride;
// DYLD_SHARED_CACHE_DIR ==> sSharedCacheOverrideDir
// DYLD_ROOT_PATH ==> gLinkContext.rootPaths
// DYLD_IMAGE_SUFFIX ==> gLinkContext.imageSuffix
// DYLD_PRINT_OPTS ==> gLinkContext.verboseOpts
// DYLD_PRINT_ENV ==> gLinkContext.verboseEnv
// DYLD_FORCE_FLAT_NAMESPACE ==> gLinkContext.bindFlat
// DYLD_PRINT_INITIALIZERS ==> gLinkContext.verboseInit
// DYLD_PRINT_SEGMENTS ==> gLinkContext.verboseMapping
// DYLD_PRINT_BINDINGS ==> gLinkContext.verboseBind
// DYLD_PRINT_WEAK_BINDINGS ==> gLinkContext.verboseWeakBind
// DYLD_PRINT_REBASINGS ==> gLinkContext.verboseRebase
// DYLD_PRINT_DOFS ==> gLinkContext.verboseDOF
// DYLD_PRINT_APIS ==> gLogAPIs
// DYLD_IGNORE_PREBINDING ==> gLinkContext.prebindUsage
// DYLD_PREBIND_DEBUG ==> gLinkContext.verbosePrebinding
// DYLD_NEW_LOCAL_SHARED_REGIONS ==> gLinkContext.sharedRegionMode
// DYLD_SHARED_REGION ==> gLinkContext.sharedRegionMode
// DYLD_PRINT_WARNINGS ==> gLinkContext.verboseWarnings
// DYLD_PRINT_RPATHS ==> gLinkContext.verboseRPaths
// DYLD_PRINT_INTERPOSING ==> gLinkContext.verboseInterposing
// DYLD_PRINT_LIBRARIES ==> gLinkContext.verboseLoading
};
typedef std::vector<dyld_image_state_change_handler> StateHandlers;
enum EnvVarMode { envNone, envPrintOnly, envAll };
// all global state
static const char* sExecPath = NULL;
static const char* sExecShortName = NULL;
static const macho_header* sMainExecutableMachHeader = NULL;
static uintptr_t sMainExecutableSlide = 0;
#if CPU_SUBTYPES_SUPPORTED
static cpu_type_t sHostCPU;
static cpu_subtype_t sHostCPUsubtype;
#endif
typedef ImageLoaderMachO* __ptrauth_dyld_address_auth MainExecutablePointerType;
static MainExecutablePointerType sMainExecutable = NULL;
static size_t sInsertedDylibCount = 0;
static std::vector<ImageLoader*> sAllImages;
static std::vector<ImageLoader*> sImageRoots;
static std::vector<ImageLoader*> sImageFilesNeedingTermination;
static std::vector<RegisteredDOF> sImageFilesNeedingDOFUnregistration;
static std::vector<ImageCallback> sAddImageCallbacks;
static std::vector<ImageCallback> sRemoveImageCallbacks;
static std::vector<LoadImageCallback> sAddLoadImageCallbacks;
static std::vector<LoadImageBulkCallback> sAddBulkLoadImageCallbacks;
static bool sRemoveImageCallbacksInUse = false;
static void* sSingleHandlers[7][3];
static void* sBatchHandlers[7][3];
static ImageLoader* sLastImageByAddressCache;
static EnvironmentVariables sEnv;
#if TARGET_OS_OSX
static const char* sFrameworkFallbackPaths[] = { "$HOME/Library/Frameworks", "/Library/Frameworks", "/Network/Library/Frameworks", "/System/Library/Frameworks", NULL };
static const char* sLibraryFallbackPaths[] = { "$HOME/lib", "/usr/local/lib", "/usr/lib", NULL };
static const char* sRestrictedFrameworkFallbackPaths[] = { "/System/Library/Frameworks", NULL };
static const char* sRestrictedLibraryFallbackPaths[] = { "/usr/lib", NULL };
#else
static const char* sFrameworkFallbackPaths[] = { "/System/Library/Frameworks", NULL };
static const char* sLibraryFallbackPaths[] = { "/usr/local/lib", "/usr/lib", NULL };
#endif
static UndefinedHandler sUndefinedHandler = NULL;
static ImageLoader* sBundleBeingLoaded = NULL; // hack until OFI is reworked
static dyld3::SharedCacheLoadInfo sSharedCacheLoadInfo;
static const char* sSharedCacheOverrideDir;
bool gSharedCacheOverridden = false;
ImageLoader::LinkContext gLinkContext;
bool gLogAPIs = false;
#if SUPPORT_ACCELERATE_TABLES
bool gLogAppAPIs = false;
#endif
const struct LibSystemHelpers* gLibSystemHelpers = NULL;
#if SUPPORT_OLD_CRT_INITIALIZATION
bool gRunInitializersOldWay = false;
#endif
static std::vector<DylibOverride> sDylibOverrides;
#if !TARGET_OS_SIMULATOR
static int sLogSocket = -1;
#endif
static bool sFrameworksFoundAsDylibs = false;
#if __x86_64__ && !TARGET_OS_SIMULATOR
static bool sHaswell = false;
#endif
static std::vector<ImageLoader::DynamicReference> sDynamicReferences;
#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Wdeprecated-declarations"
static OSSpinLock sDynamicReferencesLock = 0;
#pragma clang diagnostic pop
#if !TARGET_OS_SIMULATOR
static bool sLogToFile = false;
#endif
static char sLoadingCrashMessage[1024] = "dyld: launch, loading dependent libraries";
static _dyld_objc_notify_mapped sNotifyObjCMapped;
static _dyld_objc_notify_init sNotifyObjCInit;
static _dyld_objc_notify_unmapped sNotifyObjCUnmapped;
#if TARGET_OS_IPHONE && !TARGET_OS_SIMULATOR
static bool sForceStderr = false;
#endif
#if SUPPORT_ACCELERATE_TABLES
static ImageLoaderMegaDylib* sAllCacheImagesProxy = NULL;
// Note these are now off by default as everything should use dyld3.
static bool sDisableAcceleratorTables = true;
#endif
bool gUseDyld3 = false;
static uint32_t sLaunchModeUsed = 0;
static bool sSkipMain = false;
static void (*sEntryOverride)() = nullptr;
static bool sJustBuildClosure = false;
#if !TARGET_OS_SIMULATOR
static bool sLogClosureFailure = false;
#endif
static bool sKeysDisabled = false;
static bool sOnlyPlatformArm64e = false; // arm64e binaries can only be loaded if they are part of the OS
static dyld3::RootsChecker sRootsChecker;
enum class ClosureMode {
// Unset means we haven't provided an env variable or boot-arg to explicitly choose a mode
Unset,
// On means we set DYLD_USE_CLOSURES=1, or we didn't have DYLD_USE_CLOSURES=0 but did have
// -force_dyld3=1 env variable or a customer cache on iOS
On,
// Off means we set DYLD_USE_CLOSURES=0, or we didn't have DYLD_USE_CLOSURES=1 but did have
// -force_dyld2=1 env variable or an internal cache on iOS
Off,
// PreBuiltOnly means only use a shared cache closure and don't try build a new one
PreBuiltOnly,
};
enum class ClosureKind {
unset,
full,
minimal,
};
static ClosureMode sClosureMode = ClosureMode::Unset;
static ClosureKind sClosureKind = ClosureKind::unset;
static bool sForceInvalidSharedCacheClosureFormat = false;
static uint64_t launchTraceID = 0;
// These flags are the values in the 64-bit _COMM_PAGE_DYLD_SYSTEM_FLAGS entry
// Note we own this and can write it from PID 1
enum CommPageFlags : uint64_t {
None = 0,
// The boot args can set the low 32-bits of the comm page. We'll reserve the high 32-bits
// for runtime (launchd) set values.
CommPageBootArgMask = 0xFFFFFFFF,
// Are the simulator support dylibs definitely roots when launchd scanned them
libsystemKernelIsRoot = 1ULL << 32,
libsystemPlatformIsRoot = 1ULL << 33,
libsystemPThreadIsRoot = 1ULL << 34,
// Is the file system writable, ie, could the simulator support dylibs be written
// later, after PID 1
fileSystemCanBeModified = 1ULL << 35
};
//
// The MappedRanges structure is used for fast address->image lookups.
// The table is only updated when the dyld lock is held, so we don't
// need to worry about multiple writers. But readers may look at this
// data without holding the lock. Therefore, all updates must be done
// in an order that will never cause readers to see inconsistent data.
// The general rule is that if the image field is non-NULL then
// the other fields are valid.
//
struct MappedRanges
{
MappedRanges* next;
unsigned long count;
struct {
ImageLoader* image;
uintptr_t start;
uintptr_t end;
} array[1];
};
static MappedRanges* sMappedRangesStart;
#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Wdeprecated-declarations"
void addMappedRange(ImageLoader* image, uintptr_t start, uintptr_t end)
{
//dyld::log("addMappedRange(0x%lX->0x%lX) for %s\n", start, end, image->getShortName());
for (MappedRanges* p = sMappedRangesStart; p != NULL; p = p->next) {
for (unsigned long i=0; i < p->count; ++i) {
if ( p->array[i].image == NULL ) {
p->array[i].start = start;
p->array[i].end = end;
// add image field last with a barrier so that any reader will see consistent records
OSMemoryBarrier();
p->array[i].image = image;
return;
}
}
}
// table must be full, chain another
#if SUPPORT_ACCELERATE_TABLES
unsigned count = (sAllCacheImagesProxy != NULL) ? 16 : 400;
#else
unsigned count = 400;
#endif
size_t allocationSize = sizeof(MappedRanges) + (count-1)*3*sizeof(void*);
MappedRanges* newRanges = (MappedRanges*)malloc(allocationSize);
bzero(newRanges, allocationSize);
newRanges->count = count;
newRanges->array[0].start = start;
newRanges->array[0].end = end;
newRanges->array[0].image = image;
OSMemoryBarrier();
if ( sMappedRangesStart == NULL ) {
sMappedRangesStart = newRanges;
}
else {
for (MappedRanges* p = sMappedRangesStart; p != NULL; p = p->next) {
if ( p->next == NULL ) {
OSMemoryBarrier();
p->next = newRanges;
break;
}
}
}
}
void removedMappedRanges(ImageLoader* image)
{
for (MappedRanges* p = sMappedRangesStart; p != NULL; p = p->next) {
for (unsigned long i=0; i < p->count; ++i) {
if ( p->array[i].image == image ) {
// clear with a barrier so that any reader will see consistent records
OSMemoryBarrier();
p->array[i].image = NULL;
}
}
}
}
#pragma clang diagnostic pop
ImageLoader* findMappedRange(uintptr_t target)
{
for (MappedRanges* p = sMappedRangesStart; p != NULL; p = p->next) {
for (unsigned long i=0; i < p->count; ++i) {
if ( p->array[i].image != NULL ) {
if ( (p->array[i].start <= target) && (target < p->array[i].end) )
return p->array[i].image;
}
}
}
return NULL;
}
const char* mkstringf(const char* format, ...)
{
_SIMPLE_STRING buf = _simple_salloc();
if ( buf != NULL ) {
va_list list;
va_start(list, format);
_simple_vsprintf(buf, format, list);
va_end(list);
const char* t = strdup(_simple_string(buf));
_simple_sfree(buf);
if ( t != NULL )
return t;
}
return "mkstringf, out of memory error";
}
void throwf(const char* format, ...)
{
_SIMPLE_STRING buf = _simple_salloc();
if ( buf != NULL ) {
va_list list;
va_start(list, format);
_simple_vsprintf(buf, format, list);
va_end(list);
const char* t = strdup(_simple_string(buf));
_simple_sfree(buf);
if ( t != NULL )
throw t;
}
throw "throwf, out of memory error";
}
#if !TARGET_OS_SIMULATOR
static int sLogfile = STDERR_FILENO;
#endif
#if !TARGET_OS_SIMULATOR
// based on CFUtilities.c: also_do_stderr()
static bool useSyslog()
{
// Use syslog() for processes managed by launchd
static bool launchdChecked = false;
static bool launchdOwned = false;
if ( !launchdChecked && gProcessInfo->libSystemInitialized ) {
if ( (gLibSystemHelpers != NULL) && (gLibSystemHelpers->version >= 11) ) {
// <rdar://problem/23520449> only call isLaunchdOwned() after libSystem is initialized
launchdOwned = (*gLibSystemHelpers->isLaunchdOwned)();
launchdChecked = true;
}
}
if ( launchdChecked && launchdOwned )
return true;
// If stderr is not available, use syslog()
struct stat sb;
int result = fstat(STDERR_FILENO, &sb);
if ( result < 0 )
return true; // file descriptor 2 is closed
return false;
}
static void socket_syslogv(int priority, const char* format, va_list list)
{
// lazily create socket and connection to syslogd
if ( sLogSocket == -1 ) {
sLogSocket = ::socket(AF_UNIX, SOCK_DGRAM, 0);
if (sLogSocket == -1)
return; // cannot log
::fcntl(sLogSocket, F_SETFD, 1);
struct sockaddr_un addr;
addr.sun_family = AF_UNIX;
strncpy(addr.sun_path, _PATH_LOG, sizeof(addr.sun_path));
if ( ::connect(sLogSocket, (struct sockaddr *)&addr, sizeof(addr)) == -1 ) {
::close(sLogSocket);
sLogSocket = -1;
return;
}
}
// format message to syslogd like: "<priority>Process[pid]: message"
_SIMPLE_STRING buf = _simple_salloc();
if ( buf == NULL )
return;
if ( _simple_sprintf(buf, "<%d>%s[%d]: ", LOG_USER|LOG_NOTICE, sExecShortName, getpid()) == 0 ) {
if ( _simple_vsprintf(buf, format, list) == 0 ) {
const char* p = _simple_string(buf);
::__sendto(sLogSocket, p, strlen(p), 0, NULL, 0);
}
}
_simple_sfree(buf);
}
void vlog(const char* format, va_list list)
{
#if TARGET_OS_IPHONE && !TARGET_OS_SIMULATOR
// <rdar://problem/25965832> log to console when running iOS app from Xcode
if ( !sLogToFile && !sForceStderr && useSyslog() )
#else
if ( !sLogToFile && useSyslog() )
#endif
socket_syslogv(LOG_ERR, format, list);
else {
_simple_vdprintf(sLogfile, format, list);
}
}
void log(const char* format, ...)
{
va_list list;
va_start(list, format);
vlog(format, list);
va_end(list);
}
void vwarn(const char* format, va_list list)
{
_simple_dprintf(sLogfile, "dyld: warning, ");
_simple_vdprintf(sLogfile, format, list);
}
void warn(const char* format, ...)
{
va_list list;
va_start(list, format);
vwarn(format, list);
va_end(list);
}
void logToConsole(const char* format, ...) {
#if SUPPORT_LOGGING_TO_CONSOLE
int cfd = open(_PATH_CONSOLE, O_WRONLY|O_NOCTTY);
if (cfd == -1)
return;
va_list list;
va_start(list, format);
_simple_vdprintf(cfd, format, list);
va_end(list);
close(cfd);
#endif
}
#else
extern void vlog(const char* format, va_list list);
#endif // !TARGET_OS_SIMULATOR
#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Wdeprecated-declarations"
// <rdar://problem/8867781> control access to sAllImages through a lock
// because global dyld lock is not held during initialization phase of dlopen()
// <rdar://problem/16145518> Use OSSpinLockLock to allow yielding
static OSSpinLock sAllImagesLock = 0;
static void allImagesLock()
{
OSSpinLockLock(&sAllImagesLock);
}
static void allImagesUnlock()
{
OSSpinLockUnlock(&sAllImagesLock);
}
#pragma clang diagnostic pop
// utility class to assure files are closed when an exception is thrown
class FileOpener {
public:
FileOpener(const char* path);
~FileOpener();
int getFileDescriptor() { return fd; }
private:
int fd;
};
FileOpener::FileOpener(const char* path)
: fd(-1)
{
fd = dyld3::open(path, O_RDONLY, 0);
}
FileOpener::~FileOpener()
{
if ( fd != -1 )
close(fd);
}
static void registerDOFs(const std::vector<ImageLoader::DOFInfo>& dofs)
{
const size_t dofSectionCount = dofs.size();
if ( !sEnv.DYLD_DISABLE_DOFS && (dofSectionCount != 0) ) {
int fd = open("/dev/" DTRACEMNR_HELPER, O_RDWR);
if ( fd < 0 ) {
//dyld::warn("can't open /dev/" DTRACEMNR_HELPER " to register dtrace DOF sections\n");
}
else {
// allocate a buffer on the stack for the variable length dof_ioctl_data_t type
uint8_t buffer[sizeof(dof_ioctl_data_t) + dofSectionCount*sizeof(dof_helper_t)];
dof_ioctl_data_t* ioctlData = (dof_ioctl_data_t*)buffer;
// fill in buffer with one dof_helper_t per DOF section
ioctlData->dofiod_count = dofSectionCount;
for (unsigned int i=0; i < dofSectionCount; ++i) {
strlcpy(ioctlData->dofiod_helpers[i].dofhp_mod, dofs[i].imageShortName, DTRACE_MODNAMELEN);
ioctlData->dofiod_helpers[i].dofhp_dof = (uintptr_t)(dofs[i].dof);
ioctlData->dofiod_helpers[i].dofhp_addr = (uintptr_t)(dofs[i].dof);
}
// tell kernel about all DOF sections en mas
// pass pointer to ioctlData because ioctl() only copies a fixed size amount of data into kernel
user_addr_t val = (user_addr_t)(unsigned long)ioctlData;
if ( ioctl(fd, DTRACEHIOC_ADDDOF, &val) != -1 ) {
// kernel returns a unique identifier for each section in the dofiod_helpers[].dofhp_dof field.
for (unsigned int i=0; i < dofSectionCount; ++i) {
RegisteredDOF info;
info.mh = dofs[i].imageHeader;
info.registrationID = (int)(ioctlData->dofiod_helpers[i].dofhp_dof);
sImageFilesNeedingDOFUnregistration.push_back(info);
if ( gLinkContext.verboseDOF ) {
dyld::log("dyld: registering DOF section %p in %s with dtrace, ID=0x%08X\n",
dofs[i].dof, dofs[i].imageShortName, info.registrationID);
}
}
}
else {
//dyld::log( "dyld: ioctl to register dtrace DOF section failed\n");
}
close(fd);
}
}
}
static void unregisterDOF(int registrationID)
{
int fd = open("/dev/" DTRACEMNR_HELPER, O_RDWR, 0);
if ( fd < 0 ) {
dyld::warn("can't open /dev/" DTRACEMNR_HELPER " to unregister dtrace DOF section\n");
}
else {
ioctl(fd, DTRACEHIOC_REMOVE, registrationID);
close(fd);
if ( gLinkContext.verboseInit )
dyld::warn("unregistering DOF section ID=0x%08X with dtrace\n", registrationID);
}
}
//
// _dyld_register_func_for_add_image() is implemented as part of the general image state change notification
// Returns true if we did call add image callbacks on this image
//
static bool notifyAddImageCallbacks(ImageLoader* image)
{
// use guard so that we cannot notify about the same image twice
if ( ! image->addFuncNotified() ) {
for (std::vector<ImageCallback>::iterator it=sAddImageCallbacks.begin(); it != sAddImageCallbacks.end(); it++) {
dyld3::ScopedTimer timer(DBG_DYLD_TIMING_FUNC_FOR_ADD_IMAGE, (uint64_t)image->machHeader(), (uint64_t)(*it), 0);
(*it)(image->machHeader(), image->getSlide());
}
for (LoadImageCallback func : sAddLoadImageCallbacks) {
dyld3::ScopedTimer timer(DBG_DYLD_TIMING_FUNC_FOR_ADD_IMAGE, (uint64_t)image->machHeader(), (uint64_t)(*func), 0);
(*func)(image->machHeader(), image->getPath(), !image->neverUnload());
}
image->setAddFuncNotified();
return true;
}
return false;
}
// notify gdb about these new images
static const char* updateAllImages(enum dyld_image_states state, uint32_t infoCount, const struct dyld_image_info info[])
{
// <rdar://problem/8812589> don't add images without paths to all-image-info-list
if ( info[0].imageFilePath != NULL )
addImagesToAllImages(infoCount, info);
return NULL;
}
static StateHandlers* stateToHandlers(dyld_image_states state, void* handlersArray[7][3])
{
switch ( state ) {
case dyld_image_state_mapped:
return reinterpret_cast<StateHandlers*>(&handlersArray[0]);
case dyld_image_state_dependents_mapped:
return reinterpret_cast<StateHandlers*>(&handlersArray[1]);
case dyld_image_state_rebased:
return reinterpret_cast<StateHandlers*>(&handlersArray[2]);
case dyld_image_state_bound:
return reinterpret_cast<StateHandlers*>(&handlersArray[3]);
case dyld_image_state_dependents_initialized:
return reinterpret_cast<StateHandlers*>(&handlersArray[4]);
case dyld_image_state_initialized:
return reinterpret_cast<StateHandlers*>(&handlersArray[5]);
case dyld_image_state_terminated:
return reinterpret_cast<StateHandlers*>(&handlersArray[6]);
}
return NULL;
}
#if SUPPORT_ACCELERATE_TABLES
static dyld_image_state_change_handler getPreInitNotifyHandler(unsigned index)
{
std::vector<dyld_image_state_change_handler>* handlers = stateToHandlers(dyld_image_state_dependents_initialized, sSingleHandlers);
if ( index >= handlers->size() )
return NULL;
return (*handlers)[index];
}
static dyld_image_state_change_handler getBoundBatchHandler(unsigned index)
{
std::vector<dyld_image_state_change_handler>* handlers = stateToHandlers(dyld_image_state_bound, sBatchHandlers);
if ( index >= handlers->size() )
return NULL;
return (*handlers)[index];
}
static void notifySingleFromCache(dyld_image_states state, const mach_header* mh, const char* path)
{
//dyld::log("notifySingle(state=%d, image=%s)\n", state, image->getPath());
std::vector<dyld_image_state_change_handler>* handlers = stateToHandlers(state, sSingleHandlers);
if ( handlers != NULL ) {
dyld_image_info info;
info.imageLoadAddress = mh;
info.imageFilePath = path;
info.imageFileModDate = 0;
for (dyld_image_state_change_handler handler : *handlers) {
const char* result = (*handler)(state, 1, &info);
if ( (result != NULL) && (state == dyld_image_state_mapped) ) {
//fprintf(stderr, " image rejected by handler=%p\n", *it);
// make copy of thrown string so that later catch clauses can free it
const char* str = strdup(result);
throw str;
}
}
}
if ( (state == dyld_image_state_dependents_initialized) && (sNotifyObjCInit != NULL) && (mh->flags & MH_HAS_OBJC) ) {
dyld3::ScopedTimer timer(DBG_DYLD_TIMING_OBJC_INIT, (uint64_t)mh, 0, 0);
(*sNotifyObjCInit)(path, mh);
}
}
#endif
#if !TARGET_OS_SIMULATOR
#define DYLD_PROCESS_INFO_NOTIFY_MAGIC 0x49414E46
struct RemoteNotificationResponder {
RemoteNotificationResponder(const RemoteNotificationResponder&) = delete;
RemoteNotificationResponder(RemoteNotificationResponder&&) = delete;
RemoteNotificationResponder() {
if (dyld::gProcessInfo->notifyPorts[0] != DYLD_PROCESS_INFO_NOTIFY_MAGIC) {
// No notifier found, early out
_namesCnt = 0;
return;
}
kern_return_t kr = task_dyld_process_info_notify_get(_names, &_namesCnt);
while (kr == KERN_NO_SPACE) {
// In the future the SPI may return the size we need, but for now we just double the count. Since we don't want to depend on the
// return value in _nameCnt we set it to have a minimm of 16, double the inline storage value
_namesCnt = std::max<uint32_t>(16, 2*_namesCnt);
_namesSize = _namesCnt*sizeof(mach_port_t);
kr = vm_allocate(mach_task_self(), (vm_address_t*)&_names, _namesSize, VM_FLAGS_ANYWHERE);
if (kr != KERN_SUCCESS) {
// We could not allocate memory, time to error out
break;
}
kr = task_dyld_process_info_notify_get(_names, &_namesCnt);
if (kr != KERN_SUCCESS) {
// We failed, so deallocate the memory. If the failures was KERN_NO_SPACE we will loop back and try again
(void)vm_deallocate(mach_task_self(), (vm_address_t)_names, _namesSize);
_namesSize = 0;
}
}
if (kr != KERN_SUCCESS) {
// We failed, set _namesCnt to 0 so nothing else will happen
_namesCnt = 0;
}
}
~RemoteNotificationResponder() {
if (_namesCnt) {
for (auto i = 0; i < _namesCnt; ++i) {
(void)mach_port_deallocate(mach_task_self(), _names[i]);
}
if (_namesSize != 0) {
// We are not using inline memory, we need to free it
(void)vm_deallocate(mach_task_self(), (vm_address_t)_names, _namesSize);
}
}
}
void sendMessage(mach_msg_id_t msgId, mach_msg_size_t sendSize, mach_msg_header_t* buffer) {
if (_namesCnt == 0) { return; }
// Allocate a port to listen on in this monitoring task
mach_port_t replyPort = MACH_PORT_NULL;
mach_port_options_t options = { .flags = MPO_CONTEXT_AS_GUARD | MPO_STRICT, .mpl = { 1 }};
kern_return_t kr = mach_port_construct(mach_task_self(), &options, (mach_port_context_t)&replyPort, &replyPort);
if (kr != KERN_SUCCESS) {
return;
}
for (auto i = 0; i < _namesCnt; ++i) {
if (_names[i] == MACH_PORT_NULL) { continue; }
// Assemble a message
uint8_t replyBuffer[sizeof(mach_msg_header_t) + MAX_TRAILER_SIZE];
mach_msg_header_t* msg = buffer;
msg->msgh_bits = MACH_MSGH_BITS(MACH_MSG_TYPE_COPY_SEND,MACH_MSG_TYPE_MAKE_SEND_ONCE);
msg->msgh_id = msgId;
msg->msgh_local_port = replyPort;
msg->msgh_remote_port = _names[i];
msg->msgh_reserved = 0;
msg->msgh_size = sendSize;
kr = mach_msg_overwrite(msg, MACH_SEND_MSG | MACH_RCV_MSG, msg->msgh_size, sizeof(replyBuffer), replyPort, 0, MACH_PORT_NULL,
(mach_msg_header_t*)&replyBuffer[0], 0);
if (kr != KERN_SUCCESS) {
// Send failed, we may have been psuedo recieved. destroy the message
(void)mach_msg_destroy(msg);
// Mark the port as null. It does not matter why we failed... if it is s single message we will not retry, if it
// is a fragmented message then subsequent messages will not decode correctly
_names[i] = MACH_PORT_NULL;
}
}
(void)mach_port_destruct(mach_task_self(), replyPort, 0, (mach_port_context_t)&replyPort);
}
bool const active() const {
for (auto i = 0; i < _namesCnt; ++i) {
if (_names[i] != MACH_PORT_NULL) {
return true;
}
}
return false;
}
private:
mach_port_t _namesArray[8] = {0};
mach_port_name_array_t _names = (mach_port_name_array_t)&_namesArray[0];
mach_msg_type_number_t _namesCnt = 8;
vm_size_t _namesSize = 0;
};
//FIXME: Remove this once we drop support for iOS 11 simulators
// This is an enormous hack to keep remote introspection of older simulators working
// It works by interposing mach_msg, and redirecting message sent to a special port name. Messages to that portname will trigger a full set
// of sends to all kernel registered notifiers. In this mode mach_msg_sim_interposed() must return KERN_SUCCESS or the older dyld_sim may
// try to cleanup the notifer array.
kern_return_t mach_msg_sim_interposed( mach_msg_header_t* msg, mach_msg_option_t option, mach_msg_size_t send_size, mach_msg_size_t rcv_size,
mach_port_name_t rcv_name, mach_msg_timeout_t timeout, mach_port_name_t notify) {
if (msg->msgh_remote_port != DYLD_PROCESS_INFO_NOTIFY_MAGIC) {
// Not the magic port, so just pass through to the real mach_msg()
return mach_msg(msg, option, send_size, rcv_size, rcv_name, timeout, notify);
}
// The magic port. We know dyld_sim is trying to message observers, so lets call into our messaging code directly.
// This is kind of weird since we effectively built a buffer in dyld_sim, then pass it to mach_msg, which we interpose, unpack, and then
// pass to send_message which then sends the buffer back out vis mach_message_overwrite(), but it should work at least as well as the old
// way.
RemoteNotificationResponder responder;
responder.sendMessage(msg->msgh_id, send_size, msg);
// We always return KERN_SUCCESS, otherwise old dyld_sims might clear the port
return KERN_SUCCESS;
}
static void notifyMonitoringDyld(RemoteNotificationResponder& responder, bool unloading, unsigned imageCount,
const struct mach_header* loadAddresses[], const char* imagePaths[])
{
// Make sure there is at least enough room to hold a the largest single file entry that can exist.
static_assert((MAXPATHLEN + sizeof(dyld_process_info_image_entry) + 1 + MAX_TRAILER_SIZE) <= DYLD_PROCESS_INFO_NOTIFY_MAX_BUFFER_SIZE);
unsigned entriesSize = imageCount*sizeof(dyld_process_info_image_entry);
unsigned pathsSize = 0;
for (unsigned j=0; j < imageCount; ++j) {
pathsSize += (strlen(imagePaths[j]) + 1);
}
unsigned totalSize = (sizeof(struct dyld_process_info_notify_header) + entriesSize + pathsSize + 127) & -128; // align