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--- dyld/dyld-519.2.2/src/ImageLoaderMachO.cpp
+++ dyld/dyld-353.2.3/src/ImageLoaderMachO.cpp
@@ -52,66 +52,12 @@
#include "ImageLoaderMachOClassic.h"
#endif
#include "mach-o/dyld_images.h"
-#include "Tracing.h"
-#include "dyld.h"
// <rdar://problem/8718137> use stack guard random value to add padding between dylibs
extern "C" long __stack_chk_guard;
#ifndef LC_LOAD_UPWARD_DYLIB
#define LC_LOAD_UPWARD_DYLIB (0x23|LC_REQ_DYLD) /* load of dylib whose initializers run later */
-#endif
-
-#ifndef LC_VERSION_MIN_TVOS
- #define LC_VERSION_MIN_TVOS 0x2F
-#endif
-
-#ifndef LC_VERSION_MIN_WATCHOS
- #define LC_VERSION_MIN_WATCHOS 0x30
-#endif
-
-#ifndef LC_BUILD_VERSION
- #define LC_BUILD_VERSION 0x32 /* build for platform min OS version */
-
- /*
- * The build_version_command contains the min OS version on which this
- * binary was built to run for its platform. The list of known platforms and
- * tool values following it.
- */
- struct build_version_command {
- uint32_t cmd; /* LC_BUILD_VERSION */
- uint32_t cmdsize; /* sizeof(struct build_version_command) plus */
- /* ntools * sizeof(struct build_tool_version) */
- uint32_t platform; /* platform */
- uint32_t minos; /* X.Y.Z is encoded in nibbles xxxx.yy.zz */
- uint32_t sdk; /* X.Y.Z is encoded in nibbles xxxx.yy.zz */
- uint32_t ntools; /* number of tool entries following this */
- };
-
- struct build_tool_version {
- uint32_t tool; /* enum for the tool */
- uint32_t version; /* version number of the tool */
- };
-
- /* Known values for the platform field above. */
- #define PLATFORM_MACOS 1
- #define PLATFORM_IOS 2
- #define PLATFORM_TVOS 3
- #define PLATFORM_WATCHOS 4
- #define PLATFORM_BRIDGEOS 5
-
- /* Known values for the tool field above. */
- #define TOOL_CLANG 1
- #define TOOL_SWIFT 2
- #define TOOL_LD 3
-#endif
-
-
-
-#if TARGET_IPHONE_SIMULATOR
- #define LIBSYSTEM_DYLIB_PATH "/usr/lib/libSystem.dylib"
-#else
- #define LIBSYSTEM_DYLIB_PATH "/usr/lib/libSystem.B.dylib"
#endif
// relocation_info.r_length field has value 3 for 64-bit executables and value 2 for 32-bit executables
@@ -132,13 +78,14 @@
#endif
uint32_t ImageLoaderMachO::fgSymbolTableBinarySearchs = 0;
+uint32_t ImageLoaderMachO::fgSymbolTrieSearchs = 0;
ImageLoaderMachO::ImageLoaderMachO(const macho_header* mh, const char* path, unsigned int segCount,
uint32_t segOffsets[], unsigned int libCount)
- : ImageLoader(path, libCount), fCoveredCodeLength(0), fMachOData((uint8_t*)mh), fLinkEditBase(NULL), fSlide(0),
+ : ImageLoader(path, libCount), fMachOData((uint8_t*)mh), fLinkEditBase(NULL), fSlide(0),
fEHFrameSectionOffset(0), fUnwindInfoSectionOffset(0), fDylibIDOffset(0),
-fSegmentsCount(segCount), fIsSplitSeg(false), fInSharedCache(false),
+ fSegmentsCount(segCount), fIsSplitSeg(false), fInSharedCache(false),
#if TEXT_RELOC_SUPPORT
fTextSegmentRebases(false),
fTextSegmentBinds(false),
@@ -147,7 +94,7 @@
fReadOnlyImportSegment(false),
#endif
fHasSubLibraries(false), fHasSubUmbrella(false), fInUmbrella(false), fHasDOFSections(false), fHasDashInit(false),
- fHasInitializers(false), fHasTerminators(false), fNotifyObjC(false), fRetainForObjC(false), fRegisteredAsRequiresCoalescing(false)
+ fHasInitializers(false), fHasTerminators(false), fRegisteredAsRequiresCoalescing(false)
{
fIsSplitSeg = ((mh->flags & MH_SPLIT_SEGS) != 0);
@@ -170,44 +117,28 @@
}
-#if __MAC_OS_X_VERSION_MIN_REQUIRED
-static uintptr_t pageAlign(uintptr_t value)
-{
- return (value + 4095) & (-4096);
-}
-#endif
// determine if this mach-o file has classic or compressed LINKEDIT and number of segments it has
-void ImageLoaderMachO::sniffLoadCommands(const macho_header* mh, const char* path, bool inCache, bool* compressed,
+void ImageLoaderMachO::sniffLoadCommands(const macho_header* mh, const char* path, bool* compressed,
unsigned int* segCount, unsigned int* libCount, const LinkContext& context,
- const linkedit_data_command** codeSigCmd,
- const encryption_info_command** encryptCmd)
+ const linkedit_data_command** codeSigCmd)
{
*compressed = false;
*segCount = 0;
*libCount = 0;
*codeSigCmd = NULL;
- *encryptCmd = NULL;
+ struct macho_segment_command* segCmd;
+ bool foundLoadCommandSegment = false;
+ uint32_t loadCommandSegmentIndex = 0xFFFFFFFF;
+ uintptr_t loadCommandSegmentVMStart = 0;
+ uintptr_t loadCommandSegmentVMEnd = 0;
const uint32_t cmd_count = mh->ncmds;
- const uint32_t sizeofcmds = mh->sizeofcmds;
- if ( sizeofcmds > (MAX_MACH_O_HEADER_AND_LOAD_COMMANDS_SIZE-sizeof(macho_header)) )
- dyld::throwf("malformed mach-o: load commands size (%u) > %u", sizeofcmds, MAX_MACH_O_HEADER_AND_LOAD_COMMANDS_SIZE);
- if ( cmd_count > (sizeofcmds/sizeof(load_command)) )
- dyld::throwf("malformed mach-o: ncmds (%u) too large to fit in sizeofcmds (%u)", cmd_count, sizeofcmds);
- const struct load_command* const startCmds = (struct load_command*)(((uint8_t*)mh) + sizeof(macho_header));
- const struct load_command* const endCmds = (struct load_command*)(((uint8_t*)mh) + sizeof(macho_header) + sizeofcmds);
+ const struct load_command* const startCmds = (struct load_command*)(((uint8_t*)mh) + sizeof(macho_header));
+ const struct load_command* const endCmds = (struct load_command*)(((uint8_t*)mh) + sizeof(macho_header) + mh->sizeofcmds);
const struct load_command* cmd = startCmds;
- bool foundLoadCommandSegment = false;
- const macho_segment_command* linkeditSegCmd = NULL;
- const macho_segment_command* startOfFileSegCmd = NULL;
- const dyld_info_command* dyldInfoCmd = NULL;
- const symtab_command* symTabCmd = NULL;
- const dysymtab_command* dynSymbTabCmd = NULL;
for (uint32_t i = 0; i < cmd_count; ++i) {
uint32_t cmdLength = cmd->cmdsize;
- const macho_segment_command* segCmd;
- const dylib_command* dylibCmd;
if ( cmdLength < 8 ) {
dyld::throwf("malformed mach-o image: load command #%d length (%u) too small in %s",
i, cmdLength, path);
@@ -220,112 +151,29 @@
switch (cmd->cmd) {
case LC_DYLD_INFO:
case LC_DYLD_INFO_ONLY:
- if ( cmd->cmdsize != sizeof(dyld_info_command) )
- throw "malformed mach-o image: LC_DYLD_INFO size wrong";
- dyldInfoCmd = (struct dyld_info_command*)cmd;
*compressed = true;
break;
case LC_SEGMENT_COMMAND:
segCmd = (struct macho_segment_command*)cmd;
-#if __MAC_OS_X_VERSION_MIN_REQUIRED
- // rdar://problem/19617624 allow unmapped segments on OSX (but not iOS)
- if ( ((segCmd->filesize) > pageAlign(segCmd->vmsize)) && (segCmd->vmsize != 0) )
-#else
- // <rdar://problem/19986776> dyld should support non-allocatable __LLVM segment
- if ( (segCmd->filesize > segCmd->vmsize) && ((segCmd->vmsize != 0) || ((segCmd->flags & SG_NORELOC) == 0)) )
-#endif
- dyld::throwf("malformed mach-o image: segment load command %s filesize (0x%0lX) is larger than vmsize (0x%0lX)", segCmd->segname, (long)segCmd->filesize , (long)segCmd->vmsize );
- if ( cmd->cmdsize < sizeof(macho_segment_command) )
- throw "malformed mach-o image: LC_SEGMENT size too small";
- if ( cmd->cmdsize != (sizeof(macho_segment_command) + segCmd->nsects * sizeof(macho_section)) )
- throw "malformed mach-o image: LC_SEGMENT size wrong for number of sections";
// ignore zero-sized segments
if ( segCmd->vmsize != 0 )
*segCount += 1;
- if ( strcmp(segCmd->segname, "__LINKEDIT") == 0 ) {
- #if TARGET_IPHONE_SIMULATOR
- // Note: should check on all platforms that __LINKEDIT is read-only, but <rdar://problem/22637626&22525618>
- if ( segCmd->initprot != VM_PROT_READ )
- throw "malformed mach-o image: __LINKEDIT segment does not have read-only permissions";
- #endif
- if ( segCmd->fileoff == 0 )
- throw "malformed mach-o image: __LINKEDIT has fileoff==0 which overlaps mach_header";
- if ( linkeditSegCmd != NULL )
- throw "malformed mach-o image: multiple __LINKEDIT segments";
- linkeditSegCmd = segCmd;
- }
- else {
- if ( segCmd->initprot & 0xFFFFFFF8 )
- dyld::throwf("malformed mach-o image: %s segment has invalid permission bits (0x%X) in initprot", segCmd->segname, segCmd->initprot);
- if ( segCmd->maxprot & 0xFFFFFFF8 )
- dyld::throwf("malformed mach-o image: %s segment has invalid permission bits (0x%X) in maxprot", segCmd->segname, segCmd->maxprot);
- if ( (segCmd->initprot != 0) && ((segCmd->initprot & VM_PROT_READ) == 0) )
- dyld::throwf("malformed mach-o image: %s segment is not mapped readable", segCmd->segname);
- }
- if ( (segCmd->fileoff == 0) && (segCmd->filesize != 0) ) {
- if ( (segCmd->initprot & VM_PROT_READ) == 0 )
- dyld::throwf("malformed mach-o image: %s segment maps start of file but is not readable", segCmd->segname);
- if ( (segCmd->initprot & VM_PROT_WRITE) == VM_PROT_WRITE ) {
- if ( context.strictMachORequired )
- dyld::throwf("malformed mach-o image: %s segment maps start of file but is writable", segCmd->segname);
- }
- if ( segCmd->filesize < (sizeof(macho_header) + mh->sizeofcmds) )
- dyld::throwf("malformed mach-o image: %s segment does not map all of load commands", segCmd->segname);
- if ( startOfFileSegCmd != NULL )
- dyld::throwf("malformed mach-o image: multiple segments map start of file: %s %s", startOfFileSegCmd->segname, segCmd->segname);
- startOfFileSegCmd = segCmd;
- }
- if ( context.strictMachORequired ) {
- uintptr_t vmStart = segCmd->vmaddr;
- uintptr_t vmSize = segCmd->vmsize;
- uintptr_t vmEnd = vmStart + vmSize;
- uintptr_t fileStart = segCmd->fileoff;
- uintptr_t fileSize = segCmd->filesize;
- if ( (intptr_t)(vmSize) < 0 )
- dyld::throwf("malformed mach-o image: segment load command %s vmsize too large in %s", segCmd->segname, path);
- if ( vmStart > vmEnd )
+ // <rdar://problem/7942521> all load commands must be in an executable segment
+ if ( context.codeSigningEnforced && (segCmd->fileoff < mh->sizeofcmds) && (segCmd->filesize != 0) ) {
+ if ( (segCmd->fileoff != 0) || (segCmd->filesize < (mh->sizeofcmds+sizeof(macho_header))) )
+ dyld::throwf("malformed mach-o image: segment %s does not span all load commands", segCmd->segname);
+ if ( segCmd->initprot != (VM_PROT_READ | VM_PROT_EXECUTE) )
+ dyld::throwf("malformed mach-o image: load commands found in segment %s with wrong permissions", segCmd->segname);
+ if ( foundLoadCommandSegment )
+ throw "load commands in multiple segments";
+ foundLoadCommandSegment = true;
+ loadCommandSegmentIndex = i;
+ loadCommandSegmentVMStart = segCmd->vmaddr;
+ loadCommandSegmentVMEnd = segCmd->vmaddr + segCmd->vmsize;
+ if ( (intptr_t)(segCmd->vmsize) < 0)
+ dyld::throwf("malformed mach-o image: segment load command %s size too large", segCmd->segname);
+ if ( loadCommandSegmentVMEnd < loadCommandSegmentVMStart )
dyld::throwf("malformed mach-o image: segment load command %s wraps around address space", segCmd->segname);
- if ( vmSize != fileSize ) {
- if ( segCmd->initprot == 0 ) {
- // allow: fileSize == 0 && initprot == 0 e.g. __PAGEZERO
- // allow: vmSize == 0 && initprot == 0 e.g. __LLVM
- if ( (fileSize != 0) && (vmSize != 0) )
- dyld::throwf("malformed mach-o image: unaccessable segment %s has non-zero filesize and vmsize", segCmd->segname);
- }
- else {
- // allow: vmSize > fileSize && initprot != X e.g. __DATA
- if ( vmSize < fileSize ) {
- dyld::throwf("malformed mach-o image: segment %s has vmsize < filesize", segCmd->segname);
- }
- if ( segCmd->initprot & VM_PROT_EXECUTE ) {
- dyld::throwf("malformed mach-o image: segment %s has vmsize != filesize and is executable", segCmd->segname);
- }
- }
- }
- if ( inCache ) {
- if ( (fileSize != 0) && (segCmd->initprot == (VM_PROT_READ | VM_PROT_EXECUTE)) ) {
- if ( foundLoadCommandSegment )
- throw "load commands in multiple segments";
- foundLoadCommandSegment = true;
- }
- }
- else if ( (fileStart < mh->sizeofcmds) && (fileSize != 0) ) {
- // <rdar://problem/7942521> all load commands must be in an executable segment
- if ( (fileStart != 0) || (fileSize < (mh->sizeofcmds+sizeof(macho_header))) )
- dyld::throwf("malformed mach-o image: segment %s does not span all load commands", segCmd->segname);
- if ( segCmd->initprot != (VM_PROT_READ | VM_PROT_EXECUTE) )
- dyld::throwf("malformed mach-o image: load commands found in segment %s with wrong permissions", segCmd->segname);
- if ( foundLoadCommandSegment )
- throw "load commands in multiple segments";
- foundLoadCommandSegment = true;
- }
-
- const struct macho_section* const sectionsStart = (struct macho_section*)((char*)segCmd + sizeof(struct macho_segment_command));
- const struct macho_section* const sectionsEnd = §ionsStart[segCmd->nsects];
- for (const struct macho_section* sect=sectionsStart; sect < sectionsEnd; ++sect) {
- if (!inCache && sect->offset != 0 && ((sect->offset + sect->size) > (segCmd->fileoff + segCmd->filesize)))
- dyld::throwf("malformed mach-o image: section %s,%s of '%s' exceeds segment %s booundary", sect->segname, sect->sectname, path, segCmd->segname);
- }
}
break;
case LC_SEGMENT_COMMAND_WRONG:
@@ -336,225 +184,40 @@
case LC_REEXPORT_DYLIB:
case LC_LOAD_UPWARD_DYLIB:
*libCount += 1;
- // fall thru
- case LC_ID_DYLIB:
- dylibCmd = (dylib_command*)cmd;
- if ( dylibCmd->dylib.name.offset > cmdLength )
- dyld::throwf("malformed mach-o image: dylib load command #%d has offset (%u) outside its size (%u)", i, dylibCmd->dylib.name.offset, cmdLength);
- if ( (dylibCmd->dylib.name.offset + strlen((char*)dylibCmd + dylibCmd->dylib.name.offset) + 1) > cmdLength )
- dyld::throwf("malformed mach-o image: dylib load command #%d string extends beyond end of load command", i);
break;
case LC_CODE_SIGNATURE:
- if ( cmd->cmdsize != sizeof(linkedit_data_command) )
- throw "malformed mach-o image: LC_CODE_SIGNATURE size wrong";
- // <rdar://problem/22799652> only support one LC_CODE_SIGNATURE per image
- if ( *codeSigCmd != NULL )
- throw "malformed mach-o image: multiple LC_CODE_SIGNATURE load commands";
- *codeSigCmd = (struct linkedit_data_command*)cmd;
- break;
- case LC_ENCRYPTION_INFO:
- if ( cmd->cmdsize != sizeof(encryption_info_command) )
- throw "malformed mach-o image: LC_ENCRYPTION_INFO size wrong";
- // <rdar://problem/22799652> only support one LC_ENCRYPTION_INFO per image
- if ( *encryptCmd != NULL )
- throw "malformed mach-o image: multiple LC_ENCRYPTION_INFO load commands";
- *encryptCmd = (encryption_info_command*)cmd;
- break;
- case LC_ENCRYPTION_INFO_64:
- if ( cmd->cmdsize != sizeof(encryption_info_command_64) )
- throw "malformed mach-o image: LC_ENCRYPTION_INFO_64 size wrong";
- // <rdar://problem/22799652> only support one LC_ENCRYPTION_INFO_64 per image
- if ( *encryptCmd != NULL )
- throw "malformed mach-o image: multiple LC_ENCRYPTION_INFO_64 load commands";
- *encryptCmd = (encryption_info_command*)cmd;
- break;
- case LC_SYMTAB:
- if ( cmd->cmdsize != sizeof(symtab_command) )
- throw "malformed mach-o image: LC_SYMTAB size wrong";
- symTabCmd = (symtab_command*)cmd;
- break;
- case LC_DYSYMTAB:
- if ( cmd->cmdsize != sizeof(dysymtab_command) )
- throw "malformed mach-o image: LC_DYSYMTAB size wrong";
- dynSymbTabCmd = (dysymtab_command*)cmd;
- break;
-#if __MAC_OS_X_VERSION_MIN_REQUIRED
- // <rdar://problem/26797345> error when loading iOS Simulator mach-o binary into macOS process
- case LC_VERSION_MIN_WATCHOS:
- case LC_VERSION_MIN_TVOS:
- case LC_VERSION_MIN_IPHONEOS:
- throw "mach-o, but built for simulator (not macOS)";
- break;
-#endif
+ *codeSigCmd = (struct linkedit_data_command*)cmd; // only support one LC_CODE_SIGNATURE per image
+ break;
}
cmd = nextCmd;
}
-
- if ( context.strictMachORequired && !foundLoadCommandSegment )
+
+ if ( context.codeSigningEnforced && !foundLoadCommandSegment )
throw "load commands not in a segment";
- if ( linkeditSegCmd == NULL )
- throw "malformed mach-o image: missing __LINKEDIT segment";
- if ( !inCache && (startOfFileSegCmd == NULL) )
- throw "malformed mach-o image: missing __TEXT segment that maps start of file";
- // <rdar://problem/13145644> verify every segment does not overlap another segment
- if ( context.strictMachORequired ) {
- uintptr_t lastFileStart = 0;
- uintptr_t linkeditFileStart = 0;
- const struct load_command* cmd1 = startCmds;
+ // <rdar://problem/13145644> verify another segment does not over-map load commands
+ cmd = startCmds;
+ if ( context.codeSigningEnforced ) {
for (uint32_t i = 0; i < cmd_count; ++i) {
- if ( cmd1->cmd == LC_SEGMENT_COMMAND ) {
- struct macho_segment_command* segCmd1 = (struct macho_segment_command*)cmd1;
- uintptr_t vmStart1 = segCmd1->vmaddr;
- uintptr_t vmEnd1 = segCmd1->vmaddr + segCmd1->vmsize;
- uintptr_t fileStart1 = segCmd1->fileoff;
- uintptr_t fileEnd1 = segCmd1->fileoff + segCmd1->filesize;
-
- if (fileStart1 > lastFileStart)
- lastFileStart = fileStart1;
-
- if ( strcmp(&segCmd1->segname[0], "__LINKEDIT") == 0 ) {
- linkeditFileStart = fileStart1;
- }
-
- const struct load_command* cmd2 = startCmds;
- for (uint32_t j = 0; j < cmd_count; ++j) {
- if ( cmd2 == cmd1 )
- continue;
- if ( cmd2->cmd == LC_SEGMENT_COMMAND ) {
- struct macho_segment_command* segCmd2 = (struct macho_segment_command*)cmd2;
- uintptr_t vmStart2 = segCmd2->vmaddr;
- uintptr_t vmEnd2 = segCmd2->vmaddr + segCmd2->vmsize;
- uintptr_t fileStart2 = segCmd2->fileoff;
- uintptr_t fileEnd2 = segCmd2->fileoff + segCmd2->filesize;
- if ( ((vmStart2 <= vmStart1) && (vmEnd2 > vmStart1) && (vmEnd1 > vmStart1))
- || ((vmStart2 >= vmStart1) && (vmStart2 < vmEnd1) && (vmEnd2 > vmStart2)) )
- dyld::throwf("malformed mach-o image: segment %s vm overlaps segment %s", segCmd1->segname, segCmd2->segname);
- if ( ((fileStart2 <= fileStart1) && (fileEnd2 > fileStart1) && (fileEnd1 > fileStart1))
- || ((fileStart2 >= fileStart1) && (fileStart2 < fileEnd1) && (fileEnd2 > fileStart2)) )
- dyld::throwf("malformed mach-o image: segment %s file content overlaps segment %s", segCmd1->segname, segCmd2->segname);
+ switch (cmd->cmd) {
+ case LC_SEGMENT_COMMAND:
+ if ( i != loadCommandSegmentIndex ) {
+ segCmd = (struct macho_segment_command*)cmd;
+ uintptr_t start = segCmd->vmaddr;
+ uintptr_t end = segCmd->vmaddr + segCmd->vmsize;
+ if ( ((start <= loadCommandSegmentVMStart) && (end > loadCommandSegmentVMStart))
+ || ((start >= loadCommandSegmentVMStart) && (start < loadCommandSegmentVMEnd)) )
+ dyld::throwf("malformed mach-o image: segment %s overlaps load commands", segCmd->segname);
}
- cmd2 = (const struct load_command*)(((char*)cmd2)+cmd2->cmdsize);
- }
+ break;
}
- cmd1 = (const struct load_command*)(((char*)cmd1)+cmd1->cmdsize);
- }
-
- if (lastFileStart != linkeditFileStart)
- dyld::throwf("malformed mach-o image: __LINKEDIT must be last segment");
- }
-
- // validate linkedit content
- if ( (dyldInfoCmd == NULL) && (symTabCmd == NULL) )
- throw "malformed mach-o image: missing LC_SYMTAB or LC_DYLD_INFO";
- if ( dynSymbTabCmd == NULL )
- throw "malformed mach-o image: missing LC_DYSYMTAB";
-
- uint32_t linkeditFileOffsetStart = (uint32_t)linkeditSegCmd->fileoff;
- uint32_t linkeditFileOffsetEnd = (uint32_t)linkeditSegCmd->fileoff + (uint32_t)linkeditSegCmd->filesize;
-
- if ( !inCache && (dyldInfoCmd != NULL) && context.strictMachORequired ) {
- // validate all LC_DYLD_INFO chunks fit in LINKEDIT and don't overlap
- uint32_t offset = linkeditFileOffsetStart;
- if ( dyldInfoCmd->rebase_size != 0 ) {
- if ( dyldInfoCmd->rebase_size & 0x80000000 )
- throw "malformed mach-o image: dyld rebase info size overflow";
- if ( dyldInfoCmd->rebase_off < offset )
- throw "malformed mach-o image: dyld rebase info underruns __LINKEDIT";
- offset = dyldInfoCmd->rebase_off + dyldInfoCmd->rebase_size;
- if ( offset > linkeditFileOffsetEnd )
- throw "malformed mach-o image: dyld rebase info overruns __LINKEDIT";
- }
- if ( dyldInfoCmd->bind_size != 0 ) {
- if ( dyldInfoCmd->bind_size & 0x80000000 )
- throw "malformed mach-o image: dyld bind info size overflow";
- if ( dyldInfoCmd->bind_off < offset )
- throw "malformed mach-o image: dyld bind info overlaps rebase info";
- offset = dyldInfoCmd->bind_off + dyldInfoCmd->bind_size;
- if ( offset > linkeditFileOffsetEnd )
- throw "malformed mach-o image: dyld bind info overruns __LINKEDIT";
- }
- if ( dyldInfoCmd->weak_bind_size != 0 ) {
- if ( dyldInfoCmd->weak_bind_size & 0x80000000 )
- throw "malformed mach-o image: dyld weak bind info size overflow";
- if ( dyldInfoCmd->weak_bind_off < offset )
- throw "malformed mach-o image: dyld weak bind info overlaps bind info";
- offset = dyldInfoCmd->weak_bind_off + dyldInfoCmd->weak_bind_size;
- if ( offset > linkeditFileOffsetEnd )
- throw "malformed mach-o image: dyld weak bind info overruns __LINKEDIT";
- }
- if ( dyldInfoCmd->lazy_bind_size != 0 ) {
- if ( dyldInfoCmd->lazy_bind_size & 0x80000000 )
- throw "malformed mach-o image: dyld lazy bind info size overflow";
- if ( dyldInfoCmd->lazy_bind_off < offset )
- throw "malformed mach-o image: dyld lazy bind info overlaps weak bind info";
- offset = dyldInfoCmd->lazy_bind_off + dyldInfoCmd->lazy_bind_size;
- if ( offset > linkeditFileOffsetEnd )
- throw "malformed mach-o image: dyld lazy bind info overruns __LINKEDIT";
- }
- if ( dyldInfoCmd->export_size != 0 ) {
- if ( dyldInfoCmd->export_size & 0x80000000 )
- throw "malformed mach-o image: dyld export info size overflow";
- if ( dyldInfoCmd->export_off < offset )
- throw "malformed mach-o image: dyld export info overlaps lazy bind info";
- offset = dyldInfoCmd->export_off + dyldInfoCmd->export_size;
- if ( offset > linkeditFileOffsetEnd )
- throw "malformed mach-o image: dyld export info overruns __LINKEDIT";
- }
- }
-
- if ( symTabCmd != NULL ) {
- // validate symbol table fits in LINKEDIT
- if ( symTabCmd->symoff < linkeditFileOffsetStart )
- throw "malformed mach-o image: symbol table underruns __LINKEDIT";
- if ( symTabCmd->nsyms > 0x10000000 )
- throw "malformed mach-o image: symbol table too large";
- uint32_t symbolsSize = symTabCmd->nsyms * sizeof(macho_nlist);
- if ( symbolsSize > linkeditSegCmd->filesize )
- throw "malformed mach-o image: symbol table overruns __LINKEDIT";
- if ( symTabCmd->symoff + symbolsSize < symTabCmd->symoff )
- throw "malformed mach-o image: symbol table size wraps";
- if ( symTabCmd->symoff + symbolsSize > symTabCmd->stroff )
- throw "malformed mach-o image: symbol table overlaps symbol strings";
- if ( symTabCmd->stroff + symTabCmd->strsize < symTabCmd->stroff )
- throw "malformed mach-o image: symbol string size wraps";
- if ( symTabCmd->stroff + symTabCmd->strsize > linkeditFileOffsetEnd ) {
- // <rdar://problem/24220313> let old apps overflow as long as it stays within mapped page
- if ( context.strictMachORequired || (symTabCmd->stroff + symTabCmd->strsize > ((linkeditFileOffsetEnd + 4095) & (-4096))) )
- throw "malformed mach-o image: symbol strings overrun __LINKEDIT";
- }
- // validate indirect symbol table
- if ( dynSymbTabCmd->nindirectsyms != 0 ) {
- if ( dynSymbTabCmd->indirectsymoff < linkeditFileOffsetStart )
- throw "malformed mach-o image: indirect symbol table underruns __LINKEDIT";
- if ( dynSymbTabCmd->nindirectsyms > 0x10000000 )
- throw "malformed mach-o image: indirect symbol table too large";
- uint32_t indirectTableSize = dynSymbTabCmd->nindirectsyms * sizeof(uint32_t);
- if ( indirectTableSize > linkeditSegCmd->filesize )
- throw "malformed mach-o image: indirect symbol table overruns __LINKEDIT";
- if ( dynSymbTabCmd->indirectsymoff + indirectTableSize < dynSymbTabCmd->indirectsymoff )
- throw "malformed mach-o image: indirect symbol table size wraps";
- if ( context.strictMachORequired && (dynSymbTabCmd->indirectsymoff + indirectTableSize > symTabCmd->stroff) )
- throw "malformed mach-o image: indirect symbol table overruns string pool";
- }
- if ( (dynSymbTabCmd->nlocalsym > symTabCmd->nsyms) || (dynSymbTabCmd->ilocalsym > symTabCmd->nsyms) )
- throw "malformed mach-o image: indirect symbol table local symbol count exceeds total symbols";
- if ( dynSymbTabCmd->ilocalsym + dynSymbTabCmd->nlocalsym < dynSymbTabCmd->ilocalsym )
- throw "malformed mach-o image: indirect symbol table local symbol count wraps";
- if ( (dynSymbTabCmd->nextdefsym > symTabCmd->nsyms) || (dynSymbTabCmd->iextdefsym > symTabCmd->nsyms) )
- throw "malformed mach-o image: indirect symbol table extern symbol count exceeds total symbols";
- if ( dynSymbTabCmd->iextdefsym + dynSymbTabCmd->nextdefsym < dynSymbTabCmd->iextdefsym )
- throw "malformed mach-o image: indirect symbol table extern symbol count wraps";
- if ( (dynSymbTabCmd->nundefsym > symTabCmd->nsyms) || (dynSymbTabCmd->iundefsym > symTabCmd->nsyms) )
- throw "malformed mach-o image: indirect symbol table undefined symbol count exceeds total symbols";
- if ( dynSymbTabCmd->iundefsym + dynSymbTabCmd->nundefsym < dynSymbTabCmd->iundefsym )
- throw "malformed mach-o image: indirect symbol table undefined symbol count wraps";
- }
-
-
+ cmd = (const struct load_command*)(((char*)cmd)+cmd->cmdsize);
+ }
+ }
+
// fSegmentsArrayCount is only 8-bits
if ( *segCount > 255 )
dyld::throwf("malformed mach-o image: more than 255 segments in %s", path);
-
+
// fSegmentsArrayCount is only 8-bits
if ( *libCount > 4095 )
dyld::throwf("malformed mach-o image: more than 4095 dependent libraries in %s", path);
@@ -574,8 +237,7 @@
unsigned int segCount;
unsigned int libCount;
const linkedit_data_command* codeSigCmd;
- const encryption_info_command* encryptCmd;
- sniffLoadCommands(mh, path, false, &compressed, &segCount, &libCount, context, &codeSigCmd, &encryptCmd);
+ sniffLoadCommands(mh, path, &compressed, &segCount, &libCount, context, &codeSigCmd);
// instantiate concrete class based on content of load commands
if ( compressed )
return ImageLoaderMachOCompressed::instantiateMainExecutable(mh, slide, path, segCount, libCount, context);
@@ -589,21 +251,31 @@
// create image by mapping in a mach-o file
-ImageLoader* ImageLoaderMachO::instantiateFromFile(const char* path, int fd, const uint8_t firstPages[], size_t firstPagesSize, uint64_t offsetInFat,
+ImageLoader* ImageLoaderMachO::instantiateFromFile(const char* path, int fd, const uint8_t firstPage[4096], uint64_t offsetInFat,
uint64_t lenInFat, const struct stat& info, const LinkContext& context)
{
+ // get load commands
+ const unsigned int dataSize = sizeof(macho_header) + ((macho_header*)firstPage)->sizeofcmds;
+ uint8_t buffer[dataSize];
+ const uint8_t* fileData = firstPage;
+ if ( dataSize > 4096 ) {
+ // only read more if cmds take up more space than first page
+ fileData = buffer;
+ memcpy(buffer, firstPage, 4096);
+ pread(fd, &buffer[4096], dataSize-4096, offsetInFat+4096);
+ }
+
bool compressed;
unsigned int segCount;
unsigned int libCount;
const linkedit_data_command* codeSigCmd;
- const encryption_info_command* encryptCmd;
- sniffLoadCommands((const macho_header*)firstPages, path, false, &compressed, &segCount, &libCount, context, &codeSigCmd, &encryptCmd);
+ sniffLoadCommands((const macho_header*)fileData, path, &compressed, &segCount, &libCount, context, &codeSigCmd);
// instantiate concrete class based on content of load commands
if ( compressed )
- return ImageLoaderMachOCompressed::instantiateFromFile(path, fd, firstPages, firstPagesSize, offsetInFat, lenInFat, info, segCount, libCount, codeSigCmd, encryptCmd, context);
+ return ImageLoaderMachOCompressed::instantiateFromFile(path, fd, fileData, offsetInFat, lenInFat, info, segCount, libCount, codeSigCmd, context);
else
#if SUPPORT_CLASSIC_MACHO
- return ImageLoaderMachOClassic::instantiateFromFile(path, fd, firstPages, firstPagesSize, offsetInFat, lenInFat, info, segCount, libCount, codeSigCmd, context);
+ return ImageLoaderMachOClassic::instantiateFromFile(path, fd, fileData, offsetInFat, lenInFat, info, segCount, libCount, codeSigCmd, context);
#else
throw "missing LC_DYLD_INFO load command";
#endif
@@ -617,8 +289,7 @@
unsigned int segCount;
unsigned int libCount;
const linkedit_data_command* codeSigCmd;
- const encryption_info_command* encryptCmd;
- sniffLoadCommands(mh, path, true, &compressed, &segCount, &libCount, context, &codeSigCmd, &encryptCmd);
+ sniffLoadCommands(mh, path, &compressed, &segCount, &libCount, context, &codeSigCmd);
// instantiate concrete class based on content of load commands
if ( compressed )
return ImageLoaderMachOCompressed::instantiateFromCache(mh, path, slide, info, segCount, libCount, context);
@@ -637,8 +308,7 @@
unsigned int segCount;
unsigned int libCount;
const linkedit_data_command* sigcmd;
- const encryption_info_command* encryptCmd;
- sniffLoadCommands(mh, moduleName, false, &compressed, &segCount, &libCount, context, &sigcmd, &encryptCmd);
+ sniffLoadCommands(mh, moduleName, &compressed, &segCount, &libCount, context, &sigcmd);
// instantiate concrete class based on content of load commands
if ( compressed )
return ImageLoaderMachOCompressed::instantiateFromMemory(moduleName, mh, len, segCount, libCount, context);
@@ -667,16 +337,13 @@
}
-void ImageLoaderMachO::parseLoadCmds(const LinkContext& context)
+void ImageLoaderMachO::parseLoadCmds()
{
// now that segments are mapped in, get real fMachOData, fLinkEditBase, and fSlide
for(unsigned int i=0; i < fSegmentsCount; ++i) {
// set up pointer to __LINKEDIT segment
- if ( strcmp(segName(i),"__LINKEDIT") == 0 ) {
- if ( context.requireCodeSignature && (segFileOffset(i) > fCoveredCodeLength))
- dyld::throwf("cannot load '%s' (segment outside of code signature)", this->getShortName());
+ if ( strcmp(segName(i),"__LINKEDIT") == 0 )
fLinkEditBase = (uint8_t*)(segActualLoadAddress(i) - segFileOffset(i));
- }
#if TEXT_RELOC_SUPPORT
// __TEXT segment always starts at beginning of file and contains mach_header and load commands
if ( segExecutable(i) ) {
@@ -750,13 +417,6 @@
{
const struct macho_segment_command* seg = (struct macho_segment_command*)cmd;
const bool isTextSeg = (strcmp(seg->segname, "__TEXT") == 0);
- #if __i386__ && __MAC_OS_X_VERSION_MIN_REQUIRED
- const bool isObjCSeg = (strcmp(seg->segname, "__OBJC") == 0);
- if ( isObjCSeg )
- fNotifyObjC = true;
- #else
- const bool isDataSeg = (strncmp(seg->segname, "__DATA", 6) == 0);
- #endif
const struct macho_section* const sectionsStart = (struct macho_section*)((char*)seg + sizeof(struct macho_segment_command));
const struct macho_section* const sectionsEnd = §ionsStart[seg->nsects];
for (const struct macho_section* sect=sectionsStart; sect < sectionsEnd; ++sect) {
@@ -771,32 +431,6 @@
fEHFrameSectionOffset = (uint32_t)((uint8_t*)sect - fMachOData);
else if ( isTextSeg && (strcmp(sect->sectname, "__unwind_info") == 0) )
fUnwindInfoSectionOffset = (uint32_t)((uint8_t*)sect - fMachOData);
-
- #if __i386__ && __MAC_OS_X_VERSION_MIN_REQUIRED
- else if ( isObjCSeg ) {
- if ( strcmp(sect->sectname, "__image_info") == 0 ) {
- const uint32_t* imageInfo = (uint32_t*)(sect->addr + fSlide);
- uint32_t flags = imageInfo[1];
- if ( (flags & 4) && (((macho_header*)fMachOData)->filetype != MH_EXECUTE) )
- dyld::throwf("cannot load '%s' because Objective-C garbage collection is not supported", getPath());
- }
- else if ( ((macho_header*)fMachOData)->filetype == MH_DYLIB ) {
- fRetainForObjC = true;
- }
- }
- #else
- else if ( isDataSeg && (strncmp(sect->sectname, "__objc_imageinfo", 16) == 0) ) {
- #if __MAC_OS_X_VERSION_MIN_REQUIRED
- const uint32_t* imageInfo = (uint32_t*)(sect->addr + fSlide);
- uint32_t flags = imageInfo[1];
- if ( (flags & 4) && (((macho_header*)fMachOData)->filetype != MH_EXECUTE) )
- dyld::throwf("cannot load '%s' because Objective-C garbage collection is not supported", getPath());
- #endif
- fNotifyObjC = true;
- }
- else if ( isDataSeg && (strncmp(sect->sectname, "__objc_", 7) == 0) && (((macho_header*)fMachOData)->filetype == MH_DYLIB) )
- fRetainForObjC = true;
- #endif
}
}
break;
@@ -817,8 +451,6 @@
break;
case LC_VERSION_MIN_MACOSX:
case LC_VERSION_MIN_IPHONEOS:
- case LC_VERSION_MIN_TVOS:
- case LC_VERSION_MIN_WATCHOS:
minOSVersionCmd = (version_min_command*)cmd;
break;
default:
@@ -1006,7 +638,7 @@
unsigned int textSegmentIndex = 0;
for(unsigned int i=0; i < fSegmentsCount; ++i) {
//dyld::log("unmap %s at 0x%08lX\n", seg->getName(), seg->getActualLoadAddress(this));
- if ( (segFileOffset(i) == 0) && (segFileSize(i) != 0) ) {
+ if ( strcmp(segName(i), "__TEXT") == 0 ) {
textSegmentIndex = i;
}
else {
@@ -1135,13 +767,31 @@
void ImageLoaderMachO::loadCodeSignature(const struct linkedit_data_command* codeSigCmd, int fd, uint64_t offsetInFatFile, const LinkContext& context)
{
// if dylib being loaded has no code signature load command
- if ( codeSigCmd == NULL) {
- if (context.requireCodeSignature ) {
- // if we require dylibs to be codesigned there needs to be a signature.
+ if ( codeSigCmd == NULL ) {
+#if __MAC_OS_X_VERSION_MIN_REQUIRED
+ bool codeSigningEnforced = context.codeSigningEnforced;
+ if ( context.mainExecutableCodeSigned && !codeSigningEnforced ) {
+ static bool codeSignEnforcementDynamicallyEnabled = false;
+ if ( !codeSignEnforcementDynamicallyEnabled ) {
+ uint32_t flags;
+ if ( csops(0, CS_OPS_STATUS, &flags, sizeof(flags)) != -1 ) {
+ if ( flags & CS_ENFORCEMENT ) {
+ codeSignEnforcementDynamicallyEnabled = true;
+ }
+ }
+ }
+ codeSigningEnforced = codeSignEnforcementDynamicallyEnabled;
+ }
+ // if we require dylibs to be code signed
+ if ( codeSigningEnforced ) {
+ // if there is a non-load command based code signature, use it
+ off_t offset = (off_t)offsetInFatFile;
+ if ( fcntl(fd, F_FINDSIGS, &offset, sizeof(offset)) != -1 )
+ return;
+ // otherwise gracefully return from dlopen()
dyld::throwf("required code signature missing for '%s'\n", this->getPath());
- } else {
- disableCoverageCheck();
- }
+ }
+#endif
}
else {
#if __MAC_OS_X_VERSION_MIN_REQUIRED
@@ -1154,79 +804,15 @@
siginfo.fs_file_start=offsetInFatFile; // start of mach-o slice in fat file
siginfo.fs_blob_start=(void*)(long)(codeSigCmd->dataoff); // start of CD in mach-o file
siginfo.fs_blob_size=codeSigCmd->datasize; // size of CD
- int result = fcntl(fd, F_ADDFILESIGS_RETURN, &siginfo);
-
-#if TARGET_IPHONE_SIMULATOR
- // rdar://problem/18759224> check range covered by the code directory after loading
- // Attempt to fallback only if we are in the simulator
-
- if ( result == -1 ) {
- result = fcntl(fd, F_ADDFILESIGS, &siginfo);
- siginfo.fs_file_start = codeSigCmd->dataoff;
- }
-#endif
-
+ int result = fcntl(fd, F_ADDFILESIGS, &siginfo);
if ( result == -1 ) {
if ( (errno == EPERM) || (errno == EBADEXEC) )
dyld::throwf("code signature invalid for '%s'\n", this->getPath());
if ( context.verboseCodeSignatures )
dyld::log("dyld: Failed registering code signature for %s, errno=%d\n", this->getPath(), errno);
- siginfo.fs_file_start = UINT64_MAX;
- } else if ( context.verboseCodeSignatures ) {
- dyld::log("dyld: Registered code signature for %s\n", this->getPath());
- }
- fCoveredCodeLength = siginfo.fs_file_start;
-
-#if __MAC_OS_X_VERSION_MIN_REQUIRED
- if ( context.processUsingLibraryValidation ) {
- fchecklv checkInfo;
- char messageBuffer[512];
- messageBuffer[0] = '\0';
- checkInfo.lv_file_start = offsetInFatFile;
- checkInfo.lv_error_message_size = sizeof(messageBuffer);
- checkInfo.lv_error_message = messageBuffer;
- int res = fcntl(fd, F_CHECK_LV, &checkInfo);
- if ( res == -1 ) {
- dyld::throwf("code signature in (%s) not valid for use in process using Library Validation: %s", this->getPath(), messageBuffer);
- }
- }
-#endif
- }
-}
-
-void ImageLoaderMachO::validateFirstPages(const struct linkedit_data_command* codeSigCmd, int fd, const uint8_t *fileData, size_t lenFileData, off_t offsetInFat, const LinkContext& context)
-{
-#if __MAC_OS_X_VERSION_MIN_REQUIRED
- // rdar://problem/21839703> 15A226d: dyld crashes in mageLoaderMachO::validateFirstPages during dlopen() after encountering an mmap failure
- // We need to ignore older code signatures because they will be bad.
- if ( this->sdkVersion() < DYLD_MACOSX_VERSION_10_9 ) {
- return;
- }
-#endif
- if (codeSigCmd != NULL) {
- void *fdata = xmmap(NULL, lenFileData, PROT_READ | PROT_EXEC, MAP_SHARED, fd, offsetInFat);
- if ( fdata == MAP_FAILED ) {
-#if __MAC_OS_X_VERSION_MIN_REQUIRED
- if ( context.processUsingLibraryValidation ) {
- dyld::throwf("cannot load image with wrong team ID in process using Library Validation");
- }
else
-#endif
- {
- int errnoCopy = errno;
- if ( errnoCopy == EPERM ) {
- if ( dyld::sandboxBlockedMmap(getPath()) )
- dyld::throwf("file system sandbox blocked mmap() of '%s'", getPath());
- else
- dyld::throwf("code signing blocked mmap() of '%s'", getPath());
- }
- else
- dyld::throwf("mmap() errno=%d validating first page of '%s'", errnoCopy, getPath());
- }
- }
- if ( memcmp(fdata, fileData, lenFileData) != 0 )
- dyld::throwf("mmap() page compare failed for '%s'", getPath());
- munmap(fdata, lenFileData);
+ dyld::log("dyld: Registered code signature for %s\n", this->getPath());
+ }
}
}
@@ -1256,20 +842,14 @@
const struct macho_section* const sectionsEnd = §ionsStart[seg->nsects];
for (const struct macho_section* sect=sectionsStart; sect < sectionsEnd; ++sect) {
if ( ((sect->flags & SECTION_TYPE) == S_INTERPOSING) || ((strcmp(sect->sectname, "__interpose") == 0) && (strcmp(seg->segname, "__DATA") == 0)) ) {
- // <rdar://problem/23929217> Ensure section is within segment
- if ( (sect->addr < seg->vmaddr) || (sect->addr+sect->size > seg->vmaddr+seg->vmsize) || (sect->addr+sect->size < sect->addr) )
- dyld::throwf("interpose section has malformed address range for %s\n", this->getPath());
const InterposeData* interposeArray = (InterposeData*)(sect->addr + fSlide);
const size_t count = sect->size / sizeof(InterposeData);
- for (size_t j=0; j < count; ++j) {
+ for (size_t i=0; i < count; ++i) {
ImageLoader::InterposeTuple tuple;
- tuple.replacement = interposeArray[j].replacement;
+ tuple.replacement = interposeArray[i].replacement;
tuple.neverImage = this;
tuple.onlyImage = NULL;
- tuple.replacee = interposeArray[j].replacee;
- // <rdar://problem/25686570> ignore interposing on a weak function that does not exist
- if ( tuple.replacee == 0 )
- continue;
+ tuple.replacee = interposeArray[i].replacee;
// <rdar://problem/7937695> verify that replacement is in this image
if ( this->containsAddress((void*)tuple.replacement) ) {
// chain to any existing interpositions
@@ -1290,53 +870,36 @@
}
}
-uint32_t ImageLoaderMachO::sdkVersion(const mach_header* mh)
+uint32_t ImageLoaderMachO::sdkVersion() const
+{
+ const uint32_t cmd_count = ((macho_header*)fMachOData)->ncmds;
+ const struct load_command* const cmds = (struct load_command*)&fMachOData[sizeof(macho_header)];
+ const struct load_command* cmd = cmds;
+ const struct version_min_command* versCmd;
+ for (uint32_t i = 0; i < cmd_count; ++i) {
+ switch ( cmd->cmd ) {
+ case LC_VERSION_MIN_MACOSX:
+ case LC_VERSION_MIN_IPHONEOS:
+ versCmd = (version_min_command*)cmd;
+ return versCmd->sdk;
+ }
+ cmd = (const struct load_command*)(((char*)cmd)+cmd->cmdsize);
+ }
+ return 0;
+}
+
+uint32_t ImageLoaderMachO::minOSVersion(const mach_header* mh)
{
const uint32_t cmd_count = mh->ncmds;
const struct load_command* const cmds = (struct load_command*)(((char*)mh) + sizeof(macho_header));
const struct load_command* cmd = cmds;
const struct version_min_command* versCmd;
- const struct build_version_command* buildVersCmd;
for (uint32_t i = 0; i < cmd_count; ++i) {
switch ( cmd->cmd ) {
case LC_VERSION_MIN_MACOSX:
case LC_VERSION_MIN_IPHONEOS:
- case LC_VERSION_MIN_TVOS:
- case LC_VERSION_MIN_WATCHOS:
- versCmd = (version_min_command*)cmd;
- return versCmd->sdk;
- case LC_BUILD_VERSION:
- buildVersCmd = (build_version_command*)cmd;
- return buildVersCmd->sdk;
- }
- cmd = (const struct load_command*)(((char*)cmd)+cmd->cmdsize);
- }
- return 0;
-}
-
-uint32_t ImageLoaderMachO::sdkVersion() const
-{
- return ImageLoaderMachO::sdkVersion(machHeader());
-}
-
-uint32_t ImageLoaderMachO::minOSVersion(const mach_header* mh)
-{
- const uint32_t cmd_count = mh->ncmds;
- const struct load_command* const cmds = (struct load_command*)(((char*)mh) + sizeof(macho_header));
- const struct load_command* cmd = cmds;
- const struct version_min_command* versCmd;
- const struct build_version_command* buildVersCmd;
- for (uint32_t i = 0; i < cmd_count; ++i) {
- switch ( cmd->cmd ) {
- case LC_VERSION_MIN_MACOSX:
- case LC_VERSION_MIN_IPHONEOS:
- case LC_VERSION_MIN_TVOS:
- case LC_VERSION_MIN_WATCHOS:
versCmd = (version_min_command*)cmd;
return versCmd->version;
- case LC_BUILD_VERSION:
- buildVersCmd = (build_version_command*)cmd;
- return buildVersCmd->minos;
}
cmd = (const struct load_command*)(((char*)cmd)+cmd->cmdsize);
}
@@ -1448,7 +1011,7 @@
{
if ( needsAddedLibSystemDepency(libraryCount(), (macho_header*)fMachOData) ) {
DependentLibraryInfo* lib = &libs[0];
- lib->name = LIBSYSTEM_DYLIB_PATH;
+ lib->name = "/usr/lib/libSystem.B.dylib";
lib->info.checksum = 0;
lib->info.minVersion = 0;
lib->info.maxVersion = 0;
@@ -1486,7 +1049,7 @@
}
}
-ImageLoader::LibraryInfo ImageLoaderMachO::doGetLibraryInfo(const LibraryInfo&)
+ImageLoader::LibraryInfo ImageLoaderMachO::doGetLibraryInfo()
{
LibraryInfo info;
if ( fDylibIDOffset != 0 ) {
@@ -1514,12 +1077,10 @@
const char* pathToAdd = NULL;
const char* path = (char*)cmd + ((struct rpath_command*)cmd)->path.offset;
if ( (strncmp(path, "@loader_path", 12) == 0) && ((path[12] == '/') || (path[12] == '\0')) ) {
-#if __MAC_OS_X_VERSION_MIN_REQUIRED
- if ( context.processIsRestricted && (context.mainExecutable == this) ) {
+ if ( context.processIsRestricted && (context.mainExecutable == this) ) {
dyld::warn("LC_RPATH %s in %s being ignored in restricted program because of @loader_path\n", path, this->getPath());
break;
}
-#endif
char resolvedPath[PATH_MAX];
if ( realpath(this->getPath(), resolvedPath) != NULL ) {
char newRealPath[strlen(resolvedPath) + strlen(path)];
@@ -1532,12 +1093,10 @@
}
}
else if ( (strncmp(path, "@executable_path", 16) == 0) && ((path[16] == '/') || (path[16] == '\0')) ) {
-#if __MAC_OS_X_VERSION_MIN_REQUIRED
if ( context.processIsRestricted ) {
dyld::warn("LC_RPATH %s in %s being ignored in restricted program because of @executable_path\n", path, this->getPath());
break;
}
-#endif
char resolvedPath[PATH_MAX];
if ( realpath(context.mainExecutable->getPath(), resolvedPath) != NULL ) {
char newRealPath[strlen(resolvedPath) + strlen(path)];
@@ -1549,13 +1108,10 @@
}
}
}
-#if __MAC_OS_X_VERSION_MIN_REQUIRED
else if ( (path[0] != '/') && context.processIsRestricted ) {
dyld::warn("LC_RPATH %s in %s being ignored in restricted program because it is a relative path\n", path, this->getPath());
break;
}
-#endif
-#if SUPPORT_ROOT_PATH
else if ( (path[0] == '/') && (context.rootPaths != NULL) ) {
// <rdar://problem/5869973> DYLD_ROOT_PATH should apply to LC_RPATH rpaths
// DYLD_ROOT_PATH can be a list of paths, but at this point we can only support one, so use first combination that exists
@@ -1577,7 +1133,6 @@
pathToAdd = strdup(path);
}
}
-#endif
else {
// make copy so that all elements of 'paths' can be freed
pathToAdd = strdup(path);
@@ -1611,10 +1166,6 @@
void ImageLoaderMachO::doRebase(const LinkContext& context)
{
- // <rdar://problem/25329861> Delay calling setNeverUnload() until we know this is not for dlopen_preflight()
- if ( fRetainForObjC )
- this->setNeverUnload();
-
// if prebound and loaded at prebound address, then no need to rebase
if ( this->usablePrebinding(context) ) {
// skip rebasing because prebinding is valid
@@ -1661,7 +1212,7 @@
#endif
// do actual rebasing
- this->rebase(context, fSlide);
+ this->rebase(context);
#if TEXT_RELOC_SUPPORT
// if there were __TEXT fixups, restore write protection
@@ -1692,10 +1243,10 @@
}
#endif
-const ImageLoader::Symbol* ImageLoaderMachO::findExportedSymbol(const char* name, bool searchReExports, const char* thisPath, const ImageLoader** foundIn) const
+const ImageLoader::Symbol* ImageLoaderMachO::findExportedSymbol(const char* name, bool searchReExports, const ImageLoader** foundIn) const
{
// look in this image first
- const ImageLoader::Symbol* result = this->findShallowExportedSymbol(name, foundIn);
+ const ImageLoader::Symbol* result = this->findExportedSymbol(name, foundIn);
if ( result != NULL )
return result;
@@ -1704,8 +1255,7 @@
if ( libReExported(i) ) {
ImageLoader* image = libImage(i);
if ( image != NULL ) {
- const char* reExPath = libPath(i);
- result = image->findExportedSymbol(name, searchReExports, reExPath, foundIn);
+ const Symbol* result = image->findExportedSymbol(name, searchReExports, foundIn);
if ( result != NULL )
return result;
}
@@ -1720,7 +1270,7 @@
uintptr_t ImageLoaderMachO::getExportedSymbolAddress(const Symbol* sym, const LinkContext& context,
- const ImageLoader* requestor, bool runResolver, const char* symbolName) const
+ const ImageLoader* requestor, bool runResolver) const
{
return this->getSymbolAddress(sym, requestor, context, runResolver);
}
@@ -1830,49 +1380,6 @@
info->compact_unwind_section = (void*)(sect->addr + fSlide);
info->compact_unwind_section_length = sect->size;
}
-}
-
-intptr_t ImageLoaderMachO::computeSlide(const mach_header* mh)
-{
- const uint32_t cmd_count = mh->ncmds;
- const load_command* const cmds = (load_command*)((char*)mh + sizeof(macho_header));
- const load_command* cmd = cmds;
- for (uint32_t i = 0; i < cmd_count; ++i) {
- if ( cmd->cmd == LC_SEGMENT_COMMAND ) {
- const macho_segment_command* seg = (macho_segment_command*)cmd;
- if ( strcmp(seg->segname, "__TEXT") == 0 )
- return (char*)mh - (char*)(seg->vmaddr);
- }
- cmd = (const load_command*)(((char*)cmd)+cmd->cmdsize);
- }
- return 0;
-}
-
-bool ImageLoaderMachO::findSection(const mach_header* mh, const char* segmentName, const char* sectionName, void** sectAddress, size_t* sectSize)
-{
- const uint32_t cmd_count = mh->ncmds;
- const load_command* const cmds = (load_command*)((char*)mh + sizeof(macho_header));
- const load_command* cmd = cmds;
- for (uint32_t i = 0; i < cmd_count; ++i) {
- switch (cmd->cmd) {
- case LC_SEGMENT_COMMAND:
- {
- const macho_segment_command* seg = (macho_segment_command*)cmd;
- const macho_section* const sectionsStart = (macho_section*)((char*)seg + sizeof(macho_segment_command));
- const macho_section* const sectionsEnd = §ionsStart[seg->nsects];
- for (const macho_section* sect=sectionsStart; sect < sectionsEnd; ++sect) {
- if ( (strcmp(sect->segname, segmentName) == 0) && (strcmp(sect->sectname, sectionName) == 0) ) {
- *sectAddress = (void*)(sect->addr + computeSlide(mh));
- *sectSize = sect->size;
- return true;
- }
- }
- }
- break;
- }
- cmd = (const load_command*)(((char*)cmd)+cmd->cmdsize);
- }
- return false;
}
@@ -1910,43 +1417,13 @@
return false;
}
-const char* ImageLoaderMachO::libPath(unsigned int index) const
-{
- const uint32_t cmd_count = ((macho_header*)fMachOData)->ncmds;
- const struct load_command* const cmds = (struct load_command*)&fMachOData[sizeof(macho_header)];
- const struct load_command* cmd = cmds;
- unsigned count = 0;
- for (uint32_t i = 0; i < cmd_count; ++i) {
- switch ( cmd->cmd ) {
- case LC_LOAD_DYLIB:
- case LC_LOAD_WEAK_DYLIB:
- case LC_REEXPORT_DYLIB:
- case LC_LOAD_UPWARD_DYLIB:
- if ( index == count ) {
- const struct dylib_command* dylibCmd = (struct dylib_command*)cmd;
- return (char*)cmd + dylibCmd->dylib.name.offset;
- }
- ++count;
- break;
- }
- cmd = (const struct load_command*)(((char*)cmd)+cmd->cmdsize);
- }
-
- // <rdar://problem/24256354> if image linked with nothing and we implicitly added libSystem.dylib, return that
- if ( needsAddedLibSystemDepency(libraryCount(), (macho_header*)fMachOData) ) {
- return LIBSYSTEM_DYLIB_PATH;
- }
-
- return NULL;
-}
-
void __attribute__((noreturn)) ImageLoaderMachO::throwSymbolNotFound(const LinkContext& context, const char* symbol,
const char* referencedFrom, const char* fromVersMismatch,
const char* expectedIn)
{
// record values for possible use by CrashReporter or Finder
- (*context.setErrorStrings)(DYLD_EXIT_REASON_SYMBOL_MISSING, referencedFrom, expectedIn, symbol);
+ (*context.setErrorStrings)(dyld_error_kind_symbol_missing, referencedFrom, expectedIn, symbol);
dyld::throwf("Symbol not found: %s\n Referenced from: %s%s\n Expected in: %s\n",
symbol, referencedFrom, fromVersMismatch, expectedIn);
}
@@ -1977,20 +1454,20 @@
uintptr_t ImageLoaderMachO::bindLocation(const LinkContext& context, uintptr_t location, uintptr_t value,
- uint8_t type, const char* symbolName,
- intptr_t addend, const char* inPath, const char* toPath, const char* msg)
+ const ImageLoader* targetImage, uint8_t type, const char* symbolName,
+ intptr_t addend, const char* msg)
{
// log
if ( context.verboseBind ) {
if ( addend != 0 )
dyld::log("dyld: %sbind: %s:0x%08lX = %s:%s, *0x%08lX = 0x%08lX + %ld\n",
- msg, shortName(inPath), (uintptr_t)location,
- ((toPath != NULL) ? shortName(toPath) : "<missing weak_import>"),
+ msg, this->getShortName(), (uintptr_t)location,
+ ((targetImage != NULL) ? targetImage->getShortName() : "<weak_import-missing>"),
symbolName, (uintptr_t)location, value, addend);
else
dyld::log("dyld: %sbind: %s:0x%08lX = %s:%s, *0x%08lX = 0x%08lX\n",
- msg, shortName(inPath), (uintptr_t)location,
- ((toPath != NULL) ? shortName(toPath) : "<missing weak_import>"),
+ msg, this->getShortName(), (uintptr_t)location,
+ ((targetImage != NULL) ? targetImage->getShortName() : "<weak>import-missing>"),
symbolName, (uintptr_t)location, value);
}
#if LOG_BINDINGS
@@ -2050,7 +1527,7 @@
// These are defined in dyldStartup.s
extern "C" void stub_binding_helper();
-extern "C" int _dyld_func_lookup(const char* name, void** address);
+
void ImageLoaderMachO::setupLazyPointerHandler(const LinkContext& context)
{
@@ -2066,13 +1543,13 @@
for (uint32_t i = 0; i < cmd_count; ++i) {
if ( cmd->cmd == LC_SEGMENT_COMMAND ) {
const struct macho_segment_command* seg = (struct macho_segment_command*)cmd;
- if ( strncmp(seg->segname, "__DATA", 6) == 0 ) {
+ if ( strcmp(seg->segname, "__DATA") == 0 ) {
const struct macho_section* const sectionsStart = (struct macho_section*)((char*)seg + sizeof(struct macho_segment_command));
const struct macho_section* const sectionsEnd = §ionsStart[seg->nsects];
for (const struct macho_section* sect=sectionsStart; sect < sectionsEnd; ++sect) {
if ( strcmp(sect->sectname, "__dyld" ) == 0 ) {
struct DATAdyld* dd = (struct DATAdyld*)(sect->addr + fSlide);
- #if !__arm64__ && !__ARM_ARCH_7K__
+ #if !__arm64__
if ( sect->size > offsetof(DATAdyld, dyldLazyBinder) ) {
if ( dd->dyldLazyBinder != (void*)&stub_binding_helper )
dd->dyldLazyBinder = (void*)&stub_binding_helper;
@@ -2139,24 +1616,24 @@
vars.mh = (macho_header*)fMachOData;
// lookup _NXArgc
- sym = this->findShallowExportedSymbol("_NXArgc", NULL);
+ sym = this->findExportedSymbol("_NXArgc", false, NULL);
if ( sym != NULL )
- vars.NXArgcPtr = (int*)this->getExportedSymbolAddress(sym, context, this, false, NULL);
+ vars.NXArgcPtr = (int*)this->getExportedSymbolAddress(sym, context, this, false);
// lookup _NXArgv
- sym = this->findShallowExportedSymbol("_NXArgv", NULL);
+ sym = this->findExportedSymbol("_NXArgv", false, NULL);
if ( sym != NULL )
- vars.NXArgvPtr = (const char***)this->getExportedSymbolAddress(sym, context, this, false, NULL);
+ vars.NXArgvPtr = (const char***)this->getExportedSymbolAddress(sym, context, this, false);
// lookup _environ
- sym = this->findShallowExportedSymbol("_environ", NULL);
+ sym = this->findExportedSymbol("_environ", false, NULL);
if ( sym != NULL )
- vars.environPtr = (const char***)this->getExportedSymbolAddress(sym, context, this, false, NULL);
+ vars.environPtr = (const char***)this->getExportedSymbolAddress(sym, context, this, false);
// lookup __progname
- sym = this->findShallowExportedSymbol("___progname", NULL);
+ sym = this->findExportedSymbol("___progname", false, NULL);
if ( sym != NULL )
- vars.__prognamePtr = (const char**)this->getExportedSymbolAddress(sym, context, this, false, NULL);
+ vars.__prognamePtr = (const char**)this->getExportedSymbolAddress(sym, context, this, false);
context.setNewProgramVars(vars);
}
@@ -2200,15 +1677,9 @@
if ( ! this->containsAddress((void*)func) ) {
dyld::throwf("initializer function %p not in mapped image for %s\n", func, this->getPath());
}
- if ( ! dyld::gProcessInfo->libSystemInitialized ) {
- // <rdar://problem/17973316> libSystem initializer must run first
- dyld::throwf("-init function in image (%s) that does not link with libSystem.dylib\n", this->getPath());
- }
if ( context.verboseInit )
dyld::log("dyld: calling -init function %p in %s\n", func, this->getPath());
- dyld3::kdebug_trace_dyld_duration(DBG_DYLD_TIMING_STATIC_INITIALIZER, (uint64_t)func, 0, ^{
- func(context.argc, context.argv, context.envp, context.apple, &context.programVars);
- });
+ func(context.argc, context.argv, context.envp, context.apple, &context.programVars);
break;
}
cmd = (const struct load_command*)(((char*)cmd)+cmd->cmdsize);
@@ -2232,32 +1703,15 @@
if ( type == S_MOD_INIT_FUNC_POINTERS ) {
Initializer* inits = (Initializer*)(sect->addr + fSlide);
const size_t count = sect->size / sizeof(uintptr_t);
- // <rdar://problem/23929217> Ensure __mod_init_func section is within segment
- if ( (sect->addr < seg->vmaddr) || (sect->addr+sect->size > seg->vmaddr+seg->vmsize) || (sect->addr+sect->size < sect->addr) )
- dyld::throwf("__mod_init_funcs section has malformed address range for %s\n", this->getPath());
- for (size_t j=0; j < count; ++j) {
- Initializer func = inits[j];
+ for (size_t i=0; i < count; ++i) {
+ Initializer func = inits[i];
// <rdar://problem/8543820&9228031> verify initializers are in image
if ( ! this->containsAddress((void*)func) ) {
dyld::throwf("initializer function %p not in mapped image for %s\n", func, this->getPath());
}
- if ( ! dyld::gProcessInfo->libSystemInitialized ) {
- // <rdar://problem/17973316> libSystem initializer must run first
- const char* installPath = getInstallPath();
- if ( (installPath == NULL) || (strcmp(installPath, LIBSYSTEM_DYLIB_PATH) != 0) )
- dyld::throwf("initializer in image (%s) that does not link with libSystem.dylib\n", this->getPath());
- }
if ( context.verboseInit )
dyld::log("dyld: calling initializer function %p in %s\n", func, this->getPath());
- bool haveLibSystemHelpersBefore = (dyld::gLibSystemHelpers != NULL);
- dyld3::kdebug_trace_dyld_duration(DBG_DYLD_TIMING_STATIC_INITIALIZER, (uint64_t)func, 0, ^{
- func(context.argc, context.argv, context.envp, context.apple, &context.programVars);
- });
- bool haveLibSystemHelpersAfter = (dyld::gLibSystemHelpers != NULL);
- if ( !haveLibSystemHelpersBefore && haveLibSystemHelpersAfter ) {
- // now safe to use malloc() and other calls in libSystem.dylib
- dyld::gProcessInfo->libSystemInitialized = true;
- }
+ func(context.argc, context.argv, context.envp, context.apple, &context.programVars);
}
}
}
@@ -2266,6 +1720,9 @@
}
}
}
+
+
+
@@ -2285,9 +1742,6 @@
const struct macho_section* const sectionsEnd = §ionsStart[seg->nsects];
for (const struct macho_section* sect=sectionsStart; sect < sectionsEnd; ++sect) {
if ( (sect->flags & SECTION_TYPE) == S_DTRACE_DOF ) {
- // <rdar://problem/23929217> Ensure section is within segment
- if ( (sect->addr < seg->vmaddr) || (sect->addr+sect->size > seg->vmaddr+seg->vmsize) || (sect->addr+sect->size < sect->addr) )
- dyld::throwf("DOF section has malformed address range for %s\n", this->getPath());
ImageLoader::DOFInfo info;
info.dof = (void*)(sect->addr + fSlide);
info.imageHeader = this->machHeader();
@@ -2343,13 +1797,10 @@
for (const struct macho_section* sect=sectionsStart; sect < sectionsEnd; ++sect) {
const uint8_t type = sect->flags & SECTION_TYPE;
if ( type == S_MOD_TERM_FUNC_POINTERS ) {
- // <rdar://problem/23929217> Ensure section is within segment
- if ( (sect->addr < seg->vmaddr) || (sect->addr+sect->size > seg->vmaddr+seg->vmsize) || (sect->addr+sect->size < sect->addr) )
- dyld::throwf("DOF section has malformed address range for %s\n", this->getPath());
Terminator* terms = (Terminator*)(sect->addr + fSlide);
const size_t count = sect->size / sizeof(uintptr_t);
- for (size_t j=count; j > 0; --j) {
- Terminator func = terms[j-1];
+ for (size_t i=count; i > 0; --i) {
+ Terminator func = terms[i-1];
// <rdar://problem/8543820&9228031> verify terminators are in image
if ( ! this->containsAddress((void*)func) ) {
dyld::throwf("termination function %p not in mapped image for %s\n", func, this->getPath());
@@ -2367,9 +1818,9 @@
}
-void ImageLoaderMachO::printStatisticsDetails(unsigned int imageCount, const InitializerTimingList& timingInfo)
-{
- ImageLoader::printStatisticsDetails(imageCount, timingInfo);
+void ImageLoaderMachO::printStatistics(unsigned int imageCount, const InitializerTimingList& timingInfo)
+{
+ ImageLoader::printStatistics(imageCount, timingInfo);
dyld::log("total symbol trie searches: %d\n", fgSymbolTrieSearchs);
dyld::log("total symbol table binary searches: %d\n", fgSymbolTableBinarySearchs);
dyld::log("total images defining weak symbols: %u\n", fgImagesHasWeakDefinitions);
@@ -2412,7 +1863,7 @@
}
else if ( ! this->segmentsCanSlide() ) {
for(unsigned int i=0, e=segmentCount(); i < e; ++i) {
- if ( (strcmp(segName(i), "__PAGEZERO") == 0) && (segFileSize(i) == 0) && (segPreferredLoadAddress(i) == 0) )
+ if ( strcmp(segName(i), "__PAGEZERO") == 0 )
continue;
if ( !reserveAddressRange(segPreferredLoadAddress(i), segSize(i)) )
dyld::throwf("can't map unslidable segment %s to 0x%lX with size 0x%lX", segName(i), segPreferredLoadAddress(i), segSize(i));
@@ -2472,7 +1923,7 @@
}
// map in all segments
for(unsigned int i=0, e=segmentCount(); i < e; ++i) {
- vm_offset_t fileOffset = (vm_offset_t)(segFileOffset(i) + offsetInFat);
+ vm_offset_t fileOffset = segFileOffset(i) + offsetInFat;
vm_size_t size = segFileSize(i);
uintptr_t requestedLoadAddress = segPreferredLoadAddress(i) + slide;
int protection = 0;
@@ -2483,12 +1934,8 @@
protection |= PROT_EXEC;
if ( segReadable(i) )
protection |= PROT_READ;
- if ( segWriteable(i) ) {
+ if ( segWriteable(i) )
protection |= PROT_WRITE;
- // rdar://problem/22525618 force __LINKEDIT to always be mapped read-only
- if ( strcmp(segName(i), "__LINKEDIT") == 0 )
- protection = PROT_READ;
- }
}
#if __i386__
// initially map __IMPORT segments R/W so dyld can update them
@@ -2503,16 +1950,8 @@
}
void* loadAddress = xmmap((void*)requestedLoadAddress, size, protection, MAP_FIXED | MAP_PRIVATE, fd, fileOffset);
if ( loadAddress == ((void*)(-1)) ) {
- int mmapErr = errno;
- if ( mmapErr == EPERM ) {
- if ( dyld::sandboxBlockedMmap(getPath()) )
- dyld::throwf("file system sandbox blocked mmap() of '%s'", this->getPath());
- else
- dyld::throwf("code signing blocked mmap() of '%s'", this->getPath());
- }
- else
- dyld::throwf("mmap() errno=%d at address=0x%08lX, size=0x%08lX segment=%s in Segment::map() mapping %s",
- mmapErr, requestedLoadAddress, (uintptr_t)size, segName(i), getPath());
+ dyld::throwf("mmap() error %d at address=0x%08lX, size=0x%08lX segment=%s in Segment::map() mapping %s",
+ errno, requestedLoadAddress, (uintptr_t)size, segName(i), getPath());
}
}
// update stats
@@ -2598,191 +2037,3 @@
}
-const char* ImageLoaderMachO::findClosestSymbol(const mach_header* mh, const void* addr, const void** closestAddr)
-{
- // called by dladdr()
- // only works with compressed LINKEDIT if classic symbol table is also present
- const dysymtab_command* dynSymbolTable = NULL;
- const symtab_command* symtab = NULL;
- const macho_segment_command* seg;
- const uint8_t* unslidLinkEditBase = NULL;
- bool linkEditBaseFound = false;
- intptr_t slide = 0;
- const uint32_t cmd_count = mh->ncmds;
- const load_command* const cmds = (load_command*)((char*)mh + sizeof(macho_header));
- const load_command* cmd = cmds;
- for (uint32_t i = 0; i < cmd_count; ++i) {
- switch (cmd->cmd) {
- case LC_SEGMENT_COMMAND:
- seg = (macho_segment_command*)cmd;
- if ( strcmp(seg->segname, "__LINKEDIT") == 0 ) {
- unslidLinkEditBase = (uint8_t*)(seg->vmaddr - seg->fileoff);
- linkEditBaseFound = true;
- }
- else if ( strcmp(seg->segname, "__TEXT") == 0 ) {
- slide = (uintptr_t)mh - seg->vmaddr;
- }
- break;
- case LC_SYMTAB:
- symtab = (symtab_command*)cmd;
- break;
- case LC_DYSYMTAB:
- dynSymbolTable = (dysymtab_command*)cmd;
- break;
- }
- cmd = (const struct load_command*)(((char*)cmd)+cmd->cmdsize);
- }
- // no symbol table => no lookup by address
- if ( (symtab == NULL) || (dynSymbolTable == NULL) || !linkEditBaseFound )
- return NULL;
-
- const uint8_t* linkEditBase = unslidLinkEditBase + slide;
- const char* symbolTableStrings = (const char*)&linkEditBase[symtab->stroff];
- const macho_nlist* symbolTable = (macho_nlist*)(&linkEditBase[symtab->symoff]);
-
- uintptr_t targetAddress = (uintptr_t)addr - slide;
- const struct macho_nlist* bestSymbol = NULL;
- // first walk all global symbols
- const struct macho_nlist* const globalsStart = &symbolTable[dynSymbolTable->iextdefsym];
- const struct macho_nlist* const globalsEnd= &globalsStart[dynSymbolTable->nextdefsym];
- for (const struct macho_nlist* s = globalsStart; s < globalsEnd; ++s) {
- if ( (s->n_type & N_TYPE) == N_SECT ) {
- if ( bestSymbol == NULL ) {
- if ( s->n_value <= targetAddress )
- bestSymbol = s;
- }
- else if ( (s->n_value <= targetAddress) && (bestSymbol->n_value < s->n_value) ) {
- bestSymbol = s;
- }
- }
- }
- // next walk all local symbols
- const struct macho_nlist* const localsStart = &symbolTable[dynSymbolTable->ilocalsym];
- const struct macho_nlist* const localsEnd= &localsStart[dynSymbolTable->nlocalsym];
- for (const struct macho_nlist* s = localsStart; s < localsEnd; ++s) {
- if ( ((s->n_type & N_TYPE) == N_SECT) && ((s->n_type & N_STAB) == 0) ) {
- if ( bestSymbol == NULL ) {
- if ( s->n_value <= targetAddress )
- bestSymbol = s;
- }
- else if ( (s->n_value <= targetAddress) && (bestSymbol->n_value < s->n_value) ) {
- bestSymbol = s;
- }
- }
- }
- if ( bestSymbol != NULL ) {
-#if __arm__
- if (bestSymbol->n_desc & N_ARM_THUMB_DEF)
- *closestAddr = (void*)((bestSymbol->n_value | 1) + slide);
- else
- *closestAddr = (void*)(bestSymbol->n_value + slide);
-#else
- *closestAddr = (void*)(bestSymbol->n_value + slide);
-#endif
- return &symbolTableStrings[bestSymbol->n_un.n_strx];
- }
- return NULL;
-}
-
-bool ImageLoaderMachO::getLazyBindingInfo(uint32_t& lazyBindingInfoOffset, const uint8_t* lazyInfoStart, const uint8_t* lazyInfoEnd,
- uint8_t* segIndex, uintptr_t* segOffset, int* ordinal, const char** symbolName, bool* doneAfterBind)
-{
- if ( lazyBindingInfoOffset > (lazyInfoEnd-lazyInfoStart) )
- return false;
- uint8_t type = BIND_TYPE_POINTER;
- uint8_t symboFlags = 0;
- bool done = false;
- const uint8_t* p = &lazyInfoStart[lazyBindingInfoOffset];
- while ( !done && (p < lazyInfoEnd) ) {
- uint8_t immediate = *p & BIND_IMMEDIATE_MASK;
- uint8_t opcode = *p & BIND_OPCODE_MASK;
- ++p;
- switch (opcode) {
- case BIND_OPCODE_DONE:
- *doneAfterBind = false;
- return true;
- break;
- case BIND_OPCODE_SET_DYLIB_ORDINAL_IMM:
- *ordinal = immediate;
- break;
- case BIND_OPCODE_SET_DYLIB_ORDINAL_ULEB:
- *ordinal = (int)read_uleb128(p, lazyInfoEnd);
- break;
- case BIND_OPCODE_SET_DYLIB_SPECIAL_IMM:
- // the special ordinals are negative numbers
- if ( immediate == 0 )
- *ordinal = 0;
- else {
- int8_t signExtended = BIND_OPCODE_MASK | immediate;
- *ordinal = signExtended;
- }
- break;
- case BIND_OPCODE_SET_SYMBOL_TRAILING_FLAGS_IMM:
- *symbolName = (char*)p;
- symboFlags = immediate;
- while (*p != '\0')
- ++p;
- ++p;
- break;
- case BIND_OPCODE_SET_TYPE_IMM:
- type = immediate;
- break;
- case BIND_OPCODE_SET_SEGMENT_AND_OFFSET_ULEB:
- *segIndex = immediate;
- *segOffset = read_uleb128(p, lazyInfoEnd);
- break;
- case BIND_OPCODE_DO_BIND:
- *doneAfterBind = ((*p & BIND_OPCODE_MASK) == BIND_OPCODE_DONE);
- lazyBindingInfoOffset += p - &lazyInfoStart[lazyBindingInfoOffset];
- return true;
- break;
- case BIND_OPCODE_SET_ADDEND_SLEB:
- case BIND_OPCODE_ADD_ADDR_ULEB:
- case BIND_OPCODE_DO_BIND_ADD_ADDR_ULEB:
- case BIND_OPCODE_DO_BIND_ADD_ADDR_IMM_SCALED:
- case BIND_OPCODE_DO_BIND_ULEB_TIMES_SKIPPING_ULEB:
- default:
- return false;
- }
- }
- return false;
-}
-
-const dyld_info_command* ImageLoaderMachO::findDyldInfoLoadCommand(const mach_header* mh)
-{
- const uint32_t cmd_count = mh->ncmds;
- const load_command* const cmds = (load_command*)((char*)mh + sizeof(macho_header));
- const load_command* cmd = cmds;
- for (uint32_t i = 0; i < cmd_count; ++i) {
- switch (cmd->cmd) {
- case LC_DYLD_INFO:
- case LC_DYLD_INFO_ONLY:
- return (dyld_info_command*)cmd;
- }
- cmd = (const struct load_command*)(((char*)cmd)+cmd->cmdsize);
- }
- return NULL;
-}
-
-
-uintptr_t ImageLoaderMachO::segPreferredAddress(const mach_header* mh, unsigned segIndex)
-{
- const uint32_t cmd_count = mh->ncmds;
- const load_command* const cmds = (load_command*)((char*)mh + sizeof(macho_header));
- const load_command* cmd = cmds;
- unsigned curSegIndex = 0;
- for (uint32_t i = 0; i < cmd_count; ++i) {
- if ( cmd->cmd == LC_SEGMENT_COMMAND ) {
- if ( segIndex == curSegIndex ) {
- const macho_segment_command* segCmd = (macho_segment_command*)cmd;
- return segCmd->vmaddr;
- }
- ++curSegIndex;
- }
- cmd = (const struct load_command*)(((char*)cmd)+cmd->cmdsize);
- }
- return 0;
-}
-
-
-