#include <mach-o/loader.h>
#include <mach-o/nlist.h>
#include <sys/sysctl.h>
+#include <sys/syscall.h>
#include <libkern/OSAtomic.h>
#include <libkern/OSCacheControl.h>
#include <stdint.h>
+#include <System/sys/codesign.h>
+
+#if __has_feature(ptrauth_calls)
+#include <ptrauth.h>
+#endif
#include "ImageLoaderMachO.h"
#include "ImageLoaderMachOCompressed.h"
+#if SUPPORT_CLASSIC_MACHO
#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;
#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
+
+#define LIBSYSTEM_DYLIB_PATH "/usr/lib/libSystem.B.dylib"
+
// relocation_info.r_length field has value 3 for 64-bit executables and value 2 for 32-bit executables
#if __LP64__
#define LC_SEGMENT_COMMAND LC_SEGMENT_64
#define LC_ROUTINES_COMMAND LC_ROUTINES_64
+ #define LC_SEGMENT_COMMAND_WRONG LC_SEGMENT
struct macho_segment_command : public segment_command_64 {};
struct macho_section : public section_64 {};
struct macho_routines_command : public routines_command_64 {};
#else
#define LC_SEGMENT_COMMAND LC_SEGMENT
#define LC_ROUTINES_COMMAND LC_ROUTINES
+ #define LC_SEGMENT_COMMAND_WRONG LC_SEGMENT_64
struct macho_segment_command : public segment_command {};
struct macho_section : public section {};
struct macho_routines_command : public routines_command {};
#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), fMachOData((uint8_t*)mh), fLinkEditBase(NULL), fSlide(0),
+ : ImageLoader(path, libCount), fCoveredCodeLength(0), 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),
fReadOnlyImportSegment(false),
#endif
fHasSubLibraries(false), fHasSubUmbrella(false), fInUmbrella(false), fHasDOFSections(false), fHasDashInit(false),
- fHasInitializers(false), fHasTerminators(false), fRegisteredAsRequiresCoalescing(false)
+ fHasInitializers(false), fHasTerminators(false), fNotifyObjC(false), fRetainForObjC(false), fRegisteredAsRequiresCoalescing(false), fOverrideOfCacheImageNum(0)
{
fIsSplitSeg = ((mh->flags & MH_SPLIT_SEGS) != 0);
// ignore zero-sized segments
if ( segCmd->vmsize != 0 ) {
// record offset of load command
- segOffsets[segIndex++] = (uint8_t*)segCmd - fMachOData;
+ segOffsets[segIndex++] = (uint32_t)((uint8_t*)segCmd - fMachOData);
}
}
cmd = (const struct load_command*)(((char*)cmd)+cmd->cmdsize);
}
+#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* compressed,
- unsigned int* segCount, unsigned int* libCount,
- const linkedit_data_command** codeSigCmd)
+void ImageLoaderMachO::sniffLoadCommands(const macho_header* mh, const char* path, bool inCache, bool* compressed,
+ unsigned int* segCount, unsigned int* libCount, const LinkContext& context,
+ const linkedit_data_command** codeSigCmd,
+ const encryption_info_command** encryptCmd)
{
*compressed = false;
*segCount = 0;
*libCount = 0;
*codeSigCmd = NULL;
- struct macho_segment_command* segCmd;
-#if CODESIGNING_SUPPORT
- bool foundLoadCommandSegment = false;
-#endif
+ *encryptCmd = NULL;
+
const uint32_t cmd_count = mh->ncmds;
- 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 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* 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);
+ }
+ const struct load_command* const nextCmd = (const struct load_command*)(((char*)cmd)+cmdLength);
+ if ( (nextCmd > endCmds) || (nextCmd < cmd) ) {
+ dyld::throwf("malformed mach-o image: load command #%d length (%u) would exceed sizeofcmds (%u) in %s",
+ i, cmdLength, mh->sizeofcmds, path);
+ }
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 CODESIGNING_SUPPORT
- // <rdar://problem/7942521> all load commands must be in an executable segment
- if ( (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);
- foundLoadCommandSegment = true;
+ 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;
}
-#endif
+ 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 )
+ 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:
+ dyld::throwf("malformed mach-o image: wrong LC_SEGMENT[_64] for architecture");
break;
case LC_LOAD_DYLIB:
case LC_LOAD_WEAK_DYLIB:
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:
- *codeSigCmd = (struct linkedit_data_command*)cmd; // only support one LC_CODE_SIGNATURE per image
+ 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:
+ if ( !context.marzipan )
+ throw "mach-o, but built for simulator (not macOS)";
+ break;
+#endif
}
- uint32_t cmdLength = cmd->cmdsize;
- cmd = (const struct load_command*)(((char*)cmd)+cmdLength);
- if ( (cmd > endCmds) || (cmd < startCmds) ) {
- dyld::throwf("malformed mach-o image: load command #%d length (%u) would exceed sizeofcmds (%u) in %s",
- i, cmdLength, mh->sizeofcmds, path);
- }
+ cmd = nextCmd;
}
-
-#if CODESIGNING_SUPPORT
- if ( ! foundLoadCommandSegment )
+
+ if ( context.strictMachORequired && !foundLoadCommandSegment )
throw "load commands not in a segment";
-#endif
-
+ 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;
+ 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);
+ }
+ cmd2 = (const struct load_command*)(((char*)cmd2)+cmd2->cmdsize);
+ }
+ }
+ 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->nsyms > 0) && (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";
+ }
+
+
// 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);
unsigned int segCount;
unsigned int libCount;
const linkedit_data_command* codeSigCmd;
- sniffLoadCommands(mh, path, &compressed, &segCount, &libCount, &codeSigCmd);
+ const encryption_info_command* encryptCmd;
+ sniffLoadCommands(mh, path, false, &compressed, &segCount, &libCount, context, &codeSigCmd, &encryptCmd);
// instantiate concrete class based on content of load commands
if ( compressed )
return ImageLoaderMachOCompressed::instantiateMainExecutable(mh, slide, path, segCount, libCount, context);
else
+#if SUPPORT_CLASSIC_MACHO
return ImageLoaderMachOClassic::instantiateMainExecutable(mh, slide, path, segCount, libCount, context);
+#else
+ throw "missing LC_DYLD_INFO load command";
+#endif
}
// create image by mapping in a mach-o file
-ImageLoader* ImageLoaderMachO::instantiateFromFile(const char* path, int fd, const uint8_t firstPage[4096], uint64_t offsetInFat,
+ImageLoader* ImageLoaderMachO::instantiateFromFile(const char* path, int fd, const uint8_t firstPages[], size_t firstPagesSize, 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;
- sniffLoadCommands((const macho_header*)fileData, path, &compressed, &segCount, &libCount, &codeSigCmd);
+ const encryption_info_command* encryptCmd;
+ sniffLoadCommands((const macho_header*)firstPages, path, false, &compressed, &segCount, &libCount, context, &codeSigCmd, &encryptCmd);
// instantiate concrete class based on content of load commands
if ( compressed )
- return ImageLoaderMachOCompressed::instantiateFromFile(path, fd, fileData, offsetInFat, lenInFat, info, segCount, libCount, codeSigCmd, context);
+ return ImageLoaderMachOCompressed::instantiateFromFile(path, fd, firstPages, firstPagesSize, offsetInFat, lenInFat, info, segCount, libCount, codeSigCmd, encryptCmd, context);
else
- return ImageLoaderMachOClassic::instantiateFromFile(path, fd, fileData, offsetInFat, lenInFat, info, segCount, libCount, codeSigCmd, context);
+#if SUPPORT_CLASSIC_MACHO
+ return ImageLoaderMachOClassic::instantiateFromFile(path, fd, firstPages, firstPagesSize, offsetInFat, lenInFat, info, segCount, libCount, codeSigCmd, context);
+#else
+ throw "missing LC_DYLD_INFO load command";
+#endif
}
// create image by using cached mach-o file
unsigned int segCount;
unsigned int libCount;
const linkedit_data_command* codeSigCmd;
- sniffLoadCommands(mh, path, &compressed, &segCount, &libCount, &codeSigCmd);
+ const encryption_info_command* encryptCmd;
+ sniffLoadCommands(mh, path, true, &compressed, &segCount, &libCount, context, &codeSigCmd, &encryptCmd);
// instantiate concrete class based on content of load commands
if ( compressed )
return ImageLoaderMachOCompressed::instantiateFromCache(mh, path, slide, info, segCount, libCount, context);
else
+#if SUPPORT_CLASSIC_MACHO
return ImageLoaderMachOClassic::instantiateFromCache(mh, path, slide, info, segCount, libCount, context);
+#else
+ throw "missing LC_DYLD_INFO load command";
+#endif
}
// create image by copying an in-memory mach-o file
unsigned int segCount;
unsigned int libCount;
const linkedit_data_command* sigcmd;
- sniffLoadCommands(mh, moduleName, &compressed, &segCount, &libCount, &sigcmd);
+ const encryption_info_command* encryptCmd;
+ sniffLoadCommands(mh, moduleName, false, &compressed, &segCount, &libCount, context, &sigcmd, &encryptCmd);
// instantiate concrete class based on content of load commands
if ( compressed )
return ImageLoaderMachOCompressed::instantiateFromMemory(moduleName, mh, len, segCount, libCount, context);
else
+#if SUPPORT_CLASSIC_MACHO
return ImageLoaderMachOClassic::instantiateFromMemory(moduleName, mh, len, segCount, libCount, context);
+#else
+ throw "missing LC_DYLD_INFO load command";
+#endif
}
+int ImageLoaderMachO::crashIfInvalidCodeSignature()
+{
+ // Now that segments are mapped in, try reading from first executable segment.
+ // If code signing is enabled the kernel will validate the code signature
+ // when paging in, and kill the process if invalid.
+ for(unsigned int i=0; i < fSegmentsCount; ++i) {
+ if ( (segFileOffset(i) == 0) && (segFileSize(i) != 0) ) {
+ // return read value to ensure compiler does not optimize away load
+ int* p = (int*)segActualLoadAddress(i);
+ return *p;
+ }
+ }
+ return 0;
+}
-void ImageLoaderMachO::parseLoadCmds()
+
+void ImageLoaderMachO::parseLoadCmds(const LinkContext& context)
{
// 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 ( strcmp(segName(i),"__LINKEDIT") == 0 ) {
+ #if !__MAC_OS_X_VERSION_MIN_REQUIRED
+ // <rdar://problem/42419336> historically, macOS never did this check
+ if ( segFileOffset(i) > fCoveredCodeLength )
+ dyld::throwf("cannot load '%s' (segment outside of code signature)", this->getShortName());
+ #endif
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 ( strcmp(segName(i),"__TEXT") == 0 ) {
+ if ( segExecutable(i) ) {
if ( segHasRebaseFixUps(i) && (fSlide != 0) )
fTextSegmentRebases = true;
if ( segHasBindFixUps(i) )
{
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) {
else if ( type == S_DTRACE_DOF )
fHasDOFSections = true;
else if ( isTextSeg && (strcmp(sect->sectname, "__eh_frame") == 0) )
- fEHFrameSectionOffset = (uint8_t*)sect - fMachOData;
+ fEHFrameSectionOffset = (uint32_t)((uint8_t*)sect - fMachOData);
else if ( isTextSeg && (strcmp(sect->sectname, "__unwind_info") == 0) )
- fUnwindInfoSectionOffset = (uint8_t*)sect - fMachOData;;
+ 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;
break;
case LC_ID_DYLIB:
{
- fDylibIDOffset = (uint8_t*)cmd - fMachOData;
+ fDylibIDOffset = (uint32_t)((uint8_t*)cmd - fMachOData);
}
break;
case LC_RPATH:
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:
bool ImageLoaderMachO::segHasRebaseFixUps(unsigned int segIndex) const
{
+#if TEXT_RELOC_SUPPORT
// scan sections for fix-up bit
const macho_segment_command* segCmd = segLoadCommand(segIndex);
const struct macho_section* const sectionsStart = (struct macho_section*)((char*)segCmd + sizeof(struct macho_segment_command));
if ( (sect->flags & S_ATTR_LOC_RELOC) != 0 )
return true;
}
+#endif
return false;
}
bool ImageLoaderMachO::segHasBindFixUps(unsigned int segIndex) const
{
+#if TEXT_RELOC_SUPPORT
// scan sections for fix-up bit
const macho_segment_command* segCmd = segLoadCommand(segIndex);
const struct macho_section* const sectionsStart = (struct macho_section*)((char*)segCmd + sizeof(struct macho_segment_command));
if ( (sect->flags & S_ATTR_EXT_RELOC) != 0 )
return true;
}
+#endif
return false;
}
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 ( strcmp(segName(i), "__TEXT") == 0 ) {
+ if ( (segFileOffset(i) == 0) && (segFileSize(i) != 0) ) {
textSegmentIndex = i;
}
else {
// prefetch writable segment that have mmap'ed regions
radvisory advice;
advice.ra_offset = offsetInFat + segFileOffset(i);
- advice.ra_count = segFileSize(i);
+ advice.ra_count = (int)segFileSize(i);
// limit prefetch to 1MB (256 pages)
if ( advice.ra_count > 1024*1024 )
advice.ra_count = 1024*1024;
fSlide = slide;
}
-#if CODESIGNING_SUPPORT
-void ImageLoaderMachO::loadCodeSignature(const struct linkedit_data_command* codeSigCmd, int fd, uint64_t offsetInFatFile)
+void ImageLoaderMachO::loadCodeSignature(const struct linkedit_data_command* codeSigCmd, int fd, uint64_t offsetInFatFile, const LinkContext& context)
{
- fsignatures_t siginfo;
- siginfo.fs_file_start=offsetInFatFile; // start of mach-o slice in fat file
- siginfo.fs_blob_start=(void*)(codeSigCmd->dataoff); // start of CD in mach-o file
- siginfo.fs_blob_size=codeSigCmd->datasize; // size of CD
- int result = fcntl(fd, F_ADDFILESIGS, &siginfo);
- if ( result == -1 )
- dyld::log("dyld: F_ADDFILESIGS failed for %s with errno=%d\n", this->getPath(), errno);
- //dyld::log("dyld: registered code signature for %s\n", this->getPath());
+ dyld3::ScopedTimer(DBG_DYLD_TIMING_ATTACH_CODESIGNATURE, 0, 0, 0);
+ // if dylib being loaded has no code signature load command
+ if ( codeSigCmd == NULL) {
+ disableCoverageCheck();
+ }
+ else {
+#if __MAC_OS_X_VERSION_MIN_REQUIRED
+ // <rdar://problem/13622786> ignore code signatures in binaries built with pre-10.9 tools
+ if ( this->sdkVersion() < DYLD_MACOSX_VERSION_10_9 ) {
+ disableCoverageCheck();
+ return;
+ }
+#endif
+
+ fsignatures_t siginfo;
+ 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
+
+ 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;
+ }
+
+ {
+ 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);
+ }
+ }
}
+
+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, MAP_SHARED, fd, offsetInFat);
+ if ( fdata == MAP_FAILED ) {
+ 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);
+ }
+}
const char* ImageLoaderMachO::getInstallPath() const
return NULL;
}
-void ImageLoaderMachO::registerInterposing()
+void ImageLoaderMachO::registerInterposing(const LinkContext& context)
{
// mach-o files advertise interposing by having a __DATA __interpose section
struct InterposeData { uintptr_t replacement; uintptr_t replacee; };
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 unsigned int count = sect->size / sizeof(InterposeData);
- for (uint32_t i=0; i < count; ++i) {
+ const size_t count = sect->size / sizeof(InterposeData);
+ for (size_t j=0; j < count; ++j) {
ImageLoader::InterposeTuple tuple;
- tuple.replacement = interposeArray[i].replacement;
- tuple.replacementImage = this;
- tuple.replacee = interposeArray[i].replacee;
+ tuple.replacement = interposeArray[j].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;
// <rdar://problem/7937695> verify that replacement is in this image
if ( this->containsAddress((void*)tuple.replacement) ) {
+ // chain to any existing interpositions
for (std::vector<InterposeTuple>::iterator it=fgInterposingTuples.begin(); it != fgInterposingTuples.end(); it++) {
if ( it->replacee == tuple.replacee ) {
tuple.replacee = it->replacement;
}
}
-void* ImageLoaderMachO::getThreadPC() const
+uint32_t ImageLoaderMachO::sdkVersion(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);
+ }
+ return 0;
+}
+
+uint32_t ImageLoaderMachO::minOSVersion() const
+{
+ return ImageLoaderMachO::minOSVersion(machHeader());
+}
+
+
+void* ImageLoaderMachO::getEntryFromLC_MAIN() const
{
const uint32_t cmd_count = ((macho_header*)fMachOData)->ncmds;
const struct load_command* const cmds = (struct load_command*)&fMachOData[sizeof(macho_header)];
}
-void* ImageLoaderMachO::getMain() const
+void* ImageLoaderMachO::getEntryFromLC_UNIXTHREAD() 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;
for (uint32_t i = 0; i < cmd_count; ++i) {
- switch (cmd->cmd) {
- case LC_UNIXTHREAD:
- {
- #if __i386__
- const i386_thread_state_t* registers = (i386_thread_state_t*)(((char*)cmd) + 16);
- void* entry = (void*)(registers->eip + fSlide);
- #elif __x86_64__
- const x86_thread_state64_t* registers = (x86_thread_state64_t*)(((char*)cmd) + 16);
- void* entry = (void*)(registers->rip + fSlide);
- #elif __arm__
- const arm_thread_state_t* registers = (arm_thread_state_t*)(((char*)cmd) + 16);
- void* entry = (void*)(registers->__pc + fSlide);
- #else
- #warning need processor specific code
- #endif
- // <rdar://problem/8543820&9228031> verify entry point is in image
- if ( this->containsAddress(entry) ) {
- return entry;
- }
- }
- break;
+ if ( cmd->cmd == LC_UNIXTHREAD ) {
+ #if __i386__
+ const i386_thread_state_t* registers = (i386_thread_state_t*)(((char*)cmd) + 16);
+ void* entry = (void*)(registers->eip + fSlide);
+ // <rdar://problem/8543820&9228031> verify entry point is in image
+ if ( this->containsAddress(entry) )
+ return entry;
+ #elif __x86_64__
+ const x86_thread_state64_t* registers = (x86_thread_state64_t*)(((char*)cmd) + 16);
+ void* entry = (void*)(registers->rip + fSlide);
+ // <rdar://problem/8543820&9228031> verify entry point is in image
+ if ( this->containsAddress(entry) )
+ return entry;
+ #elif __arm64__ && !__arm64e__
+ // temp support until <rdar://39514191> is fixed
+ const uint64_t* regs64 = (uint64_t*)(((char*)cmd) + 16);
+ void* entry = (void*)(regs64[32] + fSlide); // arm_thread_state64_t.__pc
+ // <rdar://problem/8543820&9228031> verify entry point is in image
+ if ( this->containsAddress(entry) )
+ return entry;
+ #endif
}
cmd = (const struct load_command*)(((char*)cmd)+cmd->cmdsize);
}
{
if ( needsAddedLibSystemDepency(libraryCount(), (macho_header*)fMachOData) ) {
DependentLibraryInfo* lib = &libs[0];
- lib->name = "/usr/lib/libSystem.B.dylib";
+ lib->name = LIBSYSTEM_DYLIB_PATH;
lib->info.checksum = 0;
lib->info.minVersion = 0;
lib->info.maxVersion = 0;
}
}
-ImageLoader::LibraryInfo ImageLoaderMachO::doGetLibraryInfo()
+ImageLoader::LibraryInfo ImageLoaderMachO::doGetLibraryInfo(const LibraryInfo&)
{
LibraryInfo info;
if ( fDylibIDOffset != 0 ) {
case LC_RPATH:
const char* pathToAdd = NULL;
const char* path = (char*)cmd + ((struct rpath_command*)cmd)->path.offset;
- if ( strncmp(path, "@loader_path/", 13) == 0 ) {
- if ( context.processIsRestricted && (context.mainExecutable == this) ) {
+ if ( (strncmp(path, "@loader_path", 12) == 0) && ((path[12] == '/') || (path[12] == '\0')) ) {
+ if ( !context.allowAtPaths && (context.mainExecutable == this) ) {
dyld::warn("LC_RPATH %s in %s being ignored in restricted program because of @loader_path\n", path, this->getPath());
break;
}
char newRealPath[strlen(resolvedPath) + strlen(path)];
strcpy(newRealPath, resolvedPath);
char* addPoint = strrchr(newRealPath,'/');
- if ( addPoint != NULL )
- strcpy(&addPoint[1], &path[13]);
- else
- strcpy(newRealPath, &path[13]);
- pathToAdd = strdup(newRealPath);
+ if ( addPoint != NULL ) {
+ strcpy(addPoint, &path[12]);
+ pathToAdd = strdup(newRealPath);
+ }
}
}
- else if ( strncmp(path, "@executable_path/", 17) == 0 ) {
- if ( context.processIsRestricted ) {
+ else if ( (strncmp(path, "@executable_path", 16) == 0) && ((path[16] == '/') || (path[16] == '\0')) ) {
+ if ( !context.allowAtPaths) {
dyld::warn("LC_RPATH %s in %s being ignored in restricted program because of @executable_path\n", path, this->getPath());
break;
}
char newRealPath[strlen(resolvedPath) + strlen(path)];
strcpy(newRealPath, resolvedPath);
char* addPoint = strrchr(newRealPath,'/');
- if ( addPoint != NULL )
- strcpy(&addPoint[1], &path[17]);
- else
- strcpy(newRealPath, &path[17]);
- pathToAdd = strdup(newRealPath);
+ if ( addPoint != NULL ) {
+ strcpy(addPoint, &path[16]);
+ pathToAdd = strdup(newRealPath);
+ }
}
}
- else if ( (path[0] != '/') && context.processIsRestricted ) {
+ else if ( (path[0] != '/') && !context.allowAtPaths) {
dyld::warn("LC_RPATH %s in %s being ignored in restricted program because it is a relative path\n", path, this->getPath());
break;
}
+#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
bool found = false;
for(const char** rp = context.rootPaths; *rp != NULL; ++rp) {
char newPath[PATH_MAX];
- strcpy(newPath, *rp);
- strcat(newPath, path);
+ strlcpy(newPath, *rp, PATH_MAX);
+ strlcat(newPath, path, PATH_MAX);
struct stat stat_buf;
if ( stat(newPath, &stat_buf) != -1 ) {
//dyld::log("combined DYLD_ROOT_PATH and LC_RPATH: %s\n", newPath);
pathToAdd = strdup(path);
}
}
+#endif
else {
// make copy so that all elements of 'paths' can be freed
pathToAdd = strdup(path);
}
}
+
bool ImageLoaderMachO::getUUID(uuid_t uuid) const
{
const uint32_t cmd_count = ((macho_header*)fMachOData)->ncmds;
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();
+
+ // dylibs with thread local variables cannot be unloaded because there is no way to clean up all threads
+ if ( !this->inSharedCache() && (this->machHeader()->flags & MH_HAS_TLV_DESCRIPTORS) )
+ this->setNeverUnload();
+
// if prebound and loaded at prebound address, then no need to rebase
if ( this->usablePrebinding(context) ) {
// skip rebasing because prebinding is valid
#endif
// do actual rebasing
- this->rebase(context);
+ this->rebase(context, fSlide);
#if TEXT_RELOC_SUPPORT
// if there were __TEXT fixups, restore write protection
#if TEXT_RELOC_SUPPORT
void ImageLoaderMachO::makeTextSegmentWritable(const LinkContext& context, bool writeable)
{
- int textSegmentIndex = 0;
for(unsigned int i=0; i < fSegmentsCount; ++i) {
- if ( strcmp(segName(i), "__TEXT") == 0 ) {
- textSegmentIndex = i;
- break;
+ if ( segExecutable(i) ) {
+ if ( writeable ) {
+ segMakeWritable(i, context);
+ }
+ else {
+ #if !__i386__ && !__x86_64__
+ // some processors require range to be invalidated before it is made executable
+ sys_icache_invalidate((void*)segActualLoadAddress(i), segSize(textSegmentIndex));
+ #endif
+ segProtect(i, context);
+ }
}
}
- if ( writeable ) {
- segMakeWritable(textSegmentIndex, context);
- }
- else {
- // iPhoneOS requires range to be invalidated before it is made executable
- sys_icache_invalidate((void*)segActualLoadAddress(textSegmentIndex), segSize(textSegmentIndex));
- segProtect(textSegmentIndex, context);
- }
}
#endif
-const ImageLoader::Symbol* ImageLoaderMachO::findExportedSymbol(const char* name, bool searchReExports, const ImageLoader** foundIn) const
+const ImageLoader::Symbol* ImageLoaderMachO::findExportedSymbol(const char* name, bool searchReExports, const char* thisPath, const ImageLoader** foundIn) const
{
// look in this image first
- const ImageLoader::Symbol* result = this->findExportedSymbol(name, foundIn);
+ const ImageLoader::Symbol* result = this->findShallowExportedSymbol(name, foundIn);
if ( result != NULL )
return result;
if ( libReExported(i) ) {
ImageLoader* image = libImage(i);
if ( image != NULL ) {
- const Symbol* result = image->findExportedSymbol(name, searchReExports, foundIn);
+ const char* reExPath = libPath(i);
+ result = image->findExportedSymbol(name, searchReExports, reExPath, foundIn);
if ( result != NULL )
return result;
}
uintptr_t ImageLoaderMachO::getExportedSymbolAddress(const Symbol* sym, const LinkContext& context,
- const ImageLoader* requestor, bool runResolver) const
+ const ImageLoader* requestor, bool runResolver, const char* symbolName) const
{
return this->getSymbolAddress(sym, requestor, context, runResolver);
}
uintptr_t ImageLoaderMachO::getSymbolAddress(const Symbol* sym, const ImageLoader* requestor,
const LinkContext& context, bool runResolver) const
{
- uintptr_t result = exportedSymbolAddress(context, sym, runResolver);
+ uintptr_t result = exportedSymbolAddress(context, sym, requestor, runResolver);
// check for interposing overrides
- for (std::vector<InterposeTuple>::iterator it=fgInterposingTuples.begin(); it != fgInterposingTuples.end(); it++) {
- // replace all references to 'replacee' with 'replacement'
- if ( (result == it->replacee) && (requestor != it->replacementImage) ) {
- if ( context.verboseInterposing ) {
- dyld::log("dyld interposing: replace 0x%lX with 0x%lX in %s\n",
- it->replacee, it->replacement, this->getPath());
- }
- result = it->replacement;
- }
- }
+ result = interposedAddress(context, result, requestor);
return result;
}
}
}
+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 void* imageInterior, const char** segmentName, const char** sectionName, size_t* sectionOffset)
+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;
+}
+
+
+const macho_section* ImageLoaderMachO::findSection(const void* imageInterior) 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 macho_section* const sectionsEnd = §ionsStart[seg->nsects];
for (const struct macho_section* sect=sectionsStart; sect < sectionsEnd; ++sect) {
if ((sect->addr <= unslidInteriorAddress) && (unslidInteriorAddress < (sect->addr+sect->size))) {
- if ( segmentName != NULL )
- *segmentName = sect->segname;
- if ( sectionName != NULL )
- *sectionName = sect->sectname;
- if ( sectionOffset != NULL )
- *sectionOffset = unslidInteriorAddress - sect->addr;
- return true;
+ return sect;
}
}
}
}
cmd = (const struct load_command*)(((char*)cmd)+cmd->cmdsize);
}
+ return nullptr;
+}
+
+
+bool ImageLoaderMachO::findSection(const void* imageInterior, const char** segmentName, const char** sectionName, size_t* sectionOffset)
+{
+ if (const struct macho_section* sect = findSection(imageInterior)) {
+ const uintptr_t unslidInteriorAddress = (uintptr_t)imageInterior - this->getSlide();
+ if ( segmentName != NULL )
+ *segmentName = sect->segname;
+ if ( sectionName != NULL )
+ *sectionName = sect->sectname;
+ if ( sectionOffset != NULL )
+ *sectionOffset = unslidInteriorAddress - sect->addr;
+ return true;
+ }
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* expectedIn)
+ const char* referencedFrom, const char* fromVersMismatch,
+ const char* expectedIn)
{
// record values for possible use by CrashReporter or Finder
- (*context.setErrorStrings)(dyld_error_kind_symbol_missing, referencedFrom, expectedIn, symbol);
- dyld::throwf("Symbol not found: %s\n Referenced from: %s\n Expected in: %s\n", symbol, referencedFrom, expectedIn);
+ (*context.setErrorStrings)(DYLD_EXIT_REASON_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);
}
const mach_header* ImageLoaderMachO::machHeader() const
return (const void*)lastAddress;
}
+uintptr_t ImageLoaderMachO::bindLocation(const LinkContext& context, uintptr_t baseVMAddress,
+ uintptr_t location, uintptr_t value,
+ uint8_t type, const char* symbolName,
+ intptr_t addend, const char* inPath, const char* toPath, const char* msg,
+ ExtraBindData *extraBindData, uintptr_t slide)
+{
+ auto logBind = [&]() {
+ if ( !context.verboseBind )
+ return;
+ 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>"),
+ 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>"),
+ symbolName, (uintptr_t)location, value);
+ }
+ };
+
-uintptr_t ImageLoaderMachO::bindLocation(const LinkContext& context, uintptr_t location, uintptr_t value,
- 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, 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, this->getShortName(), (uintptr_t)location,
- ((targetImage != NULL) ? targetImage->getShortName() : "<weak>import-missing>"),
- symbolName, (uintptr_t)location, value);
- }
#if LOG_BINDINGS
// dyld::logBindings("%s: %s\n", targetImage->getShortName(), symbolName);
#endif
uint32_t value32;
switch (type) {
case BIND_TYPE_POINTER:
+ logBind();
// test first so we don't needless dirty pages
if ( *locationToFix != newValue )
*locationToFix = newValue;
break;
- case BIND_TYPE_TEXT_ABSOLUTE32:
+ case BIND_TYPE_TEXT_ABSOLUTE32:
+ logBind();
loc32 = (uint32_t*)locationToFix;
value32 = (uint32_t)newValue;
if ( *loc32 != value32 )
*loc32 = value32;
break;
- case BIND_TYPE_TEXT_PCREL32:
+ case BIND_TYPE_TEXT_PCREL32:
+ logBind();
loc32 = (uint32_t*)locationToFix;
- value32 = (uint32_t)newValue - (((uintptr_t)locationToFix) + 4);
+ value32 = (uint32_t)(newValue - (((uintptr_t)locationToFix) + 4));
if ( *loc32 != value32 )
*loc32 = value32;
+ break;
+ case BIND_TYPE_THREADED_BIND:
+ logBind();
+ // test first so we don't needless dirty pages
+ if ( *locationToFix != newValue )
+ *locationToFix = newValue;
+ break;
+ case BIND_TYPE_THREADED_REBASE: {
+ // Regular pointer which needs to fit in 51-bits of value.
+ // C++ RTTI uses the top bit, so we'll allow the whole top-byte
+ // and the signed-extended bottom 43-bits to be fit in to 51-bits.
+ uint64_t top8Bits = *locationToFix & 0x0007F80000000000ULL;
+ uint64_t bottom43Bits = *locationToFix & 0x000007FFFFFFFFFFULL;
+ uint64_t targetValue = ( top8Bits << 13 ) | (((intptr_t)(bottom43Bits << 21) >> 21) & 0x00FFFFFFFFFFFFFF);
+ newValue = (uintptr_t)(targetValue + slide);
+ if ( context.verboseRebase ) {
+ dyld::log("dyld: rebase: %s:*0x%08lX += 0x%08lX = 0x%08lX\n", shortName(inPath), (uintptr_t)locationToFix, slide, newValue);
+ }
+ *locationToFix = newValue;
break;
+ }
default:
dyld::throwf("bad bind type %d", type);
}
#endif
struct DATAdyld {
- void* dyldLazyBinder; // filled in at launch by dyld to point into dyld to &stub_binding_helper_interface
+ void* dyldLazyBinder; // filled in at launch by dyld to point into dyld to &stub_binding_helper
void* dyldFuncLookup; // filled in at launch by dyld to point into dyld to &_dyld_func_lookup
// the following only exist in main executables built for 10.5 or later
ProgramVars vars;
// These are defined in dyldStartup.s
extern "C" void stub_binding_helper();
-extern "C" bool dyld_func_lookup(const char* name, uintptr_t* address);
-
+extern "C" int _dyld_func_lookup(const char* name, void** address);
void ImageLoaderMachO::setupLazyPointerHandler(const LinkContext& context)
{
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 ( strcmp(seg->segname, "__DATA") == 0 ) {
+ if ( strncmp(seg->segname, "__DATA", 6) == 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 ( sect->size > offsetof(DATAdyld, dyldLazyBinder) ) {
if ( dd->dyldLazyBinder != (void*)&stub_binding_helper )
dd->dyldLazyBinder = (void*)&stub_binding_helper;
}
+ #endif // !__arm64__
+ // <rdar://problem/40352925> Add work around for existing apps that have deprecated __dyld section
+ const char* installNm = this->getInstallPath();
+ if ( (mh->filetype != MH_DYLIB) || (installNm == NULL) || (strcmp(installNm, "/usr/lib/system/libdyld.dylib") != 0) ) {
+ #if TARGET_OS_OSX
+ // don't allow macOS apps build with 10.14 or later SDK and targeting 10.8 or later to have a __dyld section
+ if ( (minOSVersion() >= 0x000a0800) && (sdkVersion() >= 0x000a0e00) )
+ dyld::throwf("__dyld section not supported in %s", this->getPath());
+ #endif
+ #if TARGET_OS_IOS || TARGET_OS_TV
+ // don't allow iOS apps build with 12.0 or later SDK to have a __dyld section
+ if ( sdkVersion() >= 0x000c0000 )
+ dyld::throwf("__dyld section not supported in %s", this->getPath());
+ #endif
+ #if TARGET_OS_WATCH
+ if ( sdkVersion() >= 0x00050000 )
+ dyld::throwf("__dyld section not supported in %s", this->getPath());
+ #endif
+ }
if ( sect->size > offsetof(DATAdyld, dyldFuncLookup) ) {
- if ( dd->dyldFuncLookup != (void*)&dyld_func_lookup )
- dd->dyldFuncLookup = (void*)&dyld_func_lookup;
+ if ( dd->dyldFuncLookup != (void*)&_dyld_func_lookup )
+ dd->dyldFuncLookup = (void*)&_dyld_func_lookup;
}
if ( mh->filetype == MH_EXECUTE ) {
// there are two ways to get the program variables
// match what crt1.o supplies, then the program has a custom entry point.
// This means it might be doing something that needs to be executed before
// initializers are run.
- if ( memcmp(this->getMain(), sStandardEntryPointInstructions, 16) != 0 ) {
+ if ( memcmp(this->getEntryFromLC_UNIXTHREAD(), sStandardEntryPointInstructions, 16) != 0 ) {
if ( context.verboseInit )
dyld::log("dyld: program uses non-standard entry point so delaying running of initializers\n");
context.setRunInitialzersOldWay();
vars.mh = (macho_header*)fMachOData;
// lookup _NXArgc
- sym = this->findExportedSymbol("_NXArgc", false, NULL);
+ sym = this->findShallowExportedSymbol("_NXArgc", NULL);
if ( sym != NULL )
- vars.NXArgcPtr = (int*)this->getExportedSymbolAddress(sym, context, this, false);
+ vars.NXArgcPtr = (int*)this->getExportedSymbolAddress(sym, context, this, false, NULL);
// lookup _NXArgv
- sym = this->findExportedSymbol("_NXArgv", false, NULL);
+ sym = this->findShallowExportedSymbol("_NXArgv", NULL);
if ( sym != NULL )
- vars.NXArgvPtr = (const char***)this->getExportedSymbolAddress(sym, context, this, false);
+ vars.NXArgvPtr = (const char***)this->getExportedSymbolAddress(sym, context, this, false, NULL);
// lookup _environ
- sym = this->findExportedSymbol("_environ", false, NULL);
+ sym = this->findShallowExportedSymbol("_environ", NULL);
if ( sym != NULL )
- vars.environPtr = (const char***)this->getExportedSymbolAddress(sym, context, this, false);
+ vars.environPtr = (const char***)this->getExportedSymbolAddress(sym, context, this, false, NULL);
// lookup __progname
- sym = this->findExportedSymbol("___progname", false, NULL);
+ sym = this->findShallowExportedSymbol("___progname", NULL);
if ( sym != NULL )
- vars.__prognamePtr = (const char**)this->getExportedSymbolAddress(sym, context, this, false);
+ vars.__prognamePtr = (const char**)this->getExportedSymbolAddress(sym, context, this, false, NULL);
context.setNewProgramVars(vars);
}
// if prebound and loaded at prebound address, and all libraries are same as when this was prebound, then no need to bind
if ( ((this->isPrebindable() && (this->getSlide() == 0)) || fInSharedCache)
&& this->usesTwoLevelNameSpace()
- && this->allDependentLibrariesAsWhenPreBound() ) {
+#if !USES_CHAINED_BINDS
+ && this->allDependentLibrariesAsWhenPreBound()
+#endif
+ ) {
// allow environment variables to disable prebinding
if ( context.bindFlat )
return false;
return false;
}
+static void *stripPointer(void *ptr) {
+#if __has_feature(ptrauth_calls)
+ return __builtin_ptrauth_strip(ptr, ptrauth_key_asia);
+#else
+ return ptr;
+#endif
+}
+
void ImageLoaderMachO::doImageInit(const LinkContext& context)
{
switch (cmd->cmd) {
case LC_ROUTINES_COMMAND:
Initializer func = (Initializer)(((struct macho_routines_command*)cmd)->init_address + fSlide);
+#if __has_feature(ptrauth_calls)
+ func = (Initializer)__builtin_ptrauth_sign_unauthenticated((void*)func, ptrauth_key_asia, 0);
+#endif
// <rdar://problem/8543820&9228031> verify initializers are in image
- if ( ! this->containsAddress((void*)func) ) {
+ if ( ! this->containsAddress(stripPointer((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 0x%p in %s\n", func, this->getPath());
- func(context.argc, context.argv, context.envp, context.apple, &context.programVars);
+ dyld::log("dyld: calling -init function %p in %s\n", func, this->getPath());
+ {
+ dyld3::ScopedTimer(DBG_DYLD_TIMING_STATIC_INITIALIZER, (uint64_t)fMachOData, (uint64_t)func, 0);
+ func(context.argc, context.argv, context.envp, context.apple, &context.programVars);
+ }
break;
}
cmd = (const struct load_command*)(((char*)cmd)+cmd->cmdsize);
const uint8_t type = sect->flags & SECTION_TYPE;
if ( type == S_MOD_INIT_FUNC_POINTERS ) {
Initializer* inits = (Initializer*)(sect->addr + fSlide);
- const uint32_t count = sect->size / sizeof(uintptr_t);
- for (uint32_t i=0; i < count; ++i) {
- Initializer func = inits[i];
+ 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];
// <rdar://problem/8543820&9228031> verify initializers are in image
- if ( ! this->containsAddress((void*)func) ) {
+ if ( ! this->containsAddress(stripPointer((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());
- func(context.argc, context.argv, context.envp, context.apple, &context.programVars);
+ bool haveLibSystemHelpersBefore = (dyld::gLibSystemHelpers != NULL);
+ {
+ dyld3::ScopedTimer(DBG_DYLD_TIMING_STATIC_INITIALIZER, (uint64_t)fMachOData, (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;
+ }
}
}
}
-
-
-
void ImageLoaderMachO::doGetDOFSections(const LinkContext& context, std::vector<ImageLoader::DOFInfo>& dofs)
{
if ( fHasDOFSections ) {
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();
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 uint32_t count = sect->size / sizeof(uintptr_t);
- for (uint32_t i=count; i > 0; --i) {
- Terminator func = terms[i-1];
+ const size_t count = sect->size / sizeof(uintptr_t);
+ for (size_t j=count; j > 0; --j) {
+ Terminator func = terms[j-1];
+#if __has_feature(ptrauth_calls)
+ func = (Terminator)__builtin_ptrauth_sign_unauthenticated((void*)func, ptrauth_key_asia, 0);
+#endif
// <rdar://problem/8543820&9228031> verify terminators are in image
- if ( ! this->containsAddress((void*)func) ) {
+ if ( ! this->containsAddress(stripPointer((void*)func)) ) {
dyld::throwf("termination function %p not in mapped image for %s\n", func, this->getPath());
}
if ( context.verboseInit )
}
-void ImageLoaderMachO::printStatistics(unsigned int imageCount, const InitializerTimingList& timingInfo)
+void ImageLoaderMachO::printStatisticsDetails(unsigned int imageCount, const InitializerTimingList& timingInfo)
{
- ImageLoader::printStatistics(imageCount, timingInfo);
+ ImageLoader::printStatisticsDetails(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);
uintptr_t highAddr = 0;
for(unsigned int i=0, e=segmentCount(); i < e; ++i) {
const uintptr_t segLow = segPreferredLoadAddress(i);
- const uintptr_t segHigh = (segLow + segSize(i) + 4095) & -4096;
+ const uintptr_t segHigh = dyld_page_round(segLow + segSize(i));
+ if ( segLow < highAddr ) {
+ if ( dyld_page_size > 4096 )
+ dyld::throwf("can't map segments into 16KB pages");
+ else
+ dyld::throwf("overlapping segments");
+ }
if ( segLow < lowAddr )
lowAddr = segLow;
if ( segHigh > highAddr )
}
else if ( ! this->segmentsCanSlide() ) {
for(unsigned int i=0, e=segmentCount(); i < e; ++i) {
- if ( strcmp(segName(i), "__PAGEZERO") == 0 )
+ if ( (strcmp(segName(i), "__PAGEZERO") == 0) && (segFileSize(i) == 0) && (segPreferredLoadAddress(i) == 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));
// in PIE programs, load initial dylibs after main executable so they don't have fixed addresses either
if ( fgNextPIEDylibAddress != 0 ) {
// add small (0-3 pages) random padding between dylibs
- addr = fgNextPIEDylibAddress + (__stack_chk_guard/fgNextPIEDylibAddress & (sizeof(long)-1))*4096;
+ addr = fgNextPIEDylibAddress + (__stack_chk_guard/fgNextPIEDylibAddress & (sizeof(long)-1))*dyld_page_size;
//dyld::log("padding 0x%08llX, guard=0x%08llX\n", (long long)(addr - fgNextPIEDylibAddress), (long long)(__stack_chk_guard));
- kern_return_t r = vm_allocate(mach_task_self(), &addr, size, VM_FLAGS_FIXED);
+ kern_return_t r = vm_alloc(&addr, size, VM_FLAGS_FIXED | VM_MAKE_TAG(VM_MEMORY_DYLIB));
if ( r == KERN_SUCCESS ) {
fgNextPIEDylibAddress = addr + size;
return addr;
}
fgNextPIEDylibAddress = 0;
}
- kern_return_t r = vm_allocate(mach_task_self(), &addr, size, VM_FLAGS_ANYWHERE);
+ kern_return_t r = vm_alloc(&addr, size, VM_FLAGS_ANYWHERE | VM_MAKE_TAG(VM_MEMORY_DYLIB));
if ( r != KERN_SUCCESS )
throw "out of address space";
{
vm_address_t addr = start;
vm_size_t size = length;
- kern_return_t r = vm_allocate(mach_task_self(), &addr, size, false /*only this range*/);
+ kern_return_t r = vm_alloc(&addr, size, VM_FLAGS_FIXED | VM_MAKE_TAG(VM_MEMORY_DYLIB));
if ( r != KERN_SUCCESS )
return false;
return true;
{
// find address range for image
intptr_t slide = this->assignSegmentAddresses(context);
- if ( context.verboseMapping )
- dyld::log("dyld: Mapping %s\n", this->getPath());
+ if ( context.verboseMapping ) {
+ if ( offsetInFat != 0 )
+ dyld::log("dyld: Mapping %s (slice offset=%llu)\n", this->getPath(), (unsigned long long)offsetInFat);
+ else
+ dyld::log("dyld: Mapping %s\n", this->getPath());
+ }
// map in all segments
for(unsigned int i=0, e=segmentCount(); i < e; ++i) {
- vm_offset_t fileOffset = segFileOffset(i) + offsetInFat;
+ vm_offset_t fileOffset = (vm_offset_t)(segFileOffset(i) + offsetInFat);
vm_size_t size = segFileSize(i);
uintptr_t requestedLoadAddress = segPreferredLoadAddress(i) + slide;
int protection = 0;
if ( !segUnaccessible(i) ) {
- // If has text-relocs, don't set x-bit initially.
- // Instead set it later after text-relocs have been done.
- // The iPhone OS does not like it when you make executable code writable.
- if ( segExecutable(i) && !(segHasRebaseFixUps(i) && (slide != 0)) )
+ if ( segExecutable(i) )
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
dyld::throwf("truncated mach-o error: segment %s extends to %llu which is past end of file %llu",
segName(i), (uint64_t)(fileOffset+size), fileLen);
}
- void* loadAddress = mmap((void*)requestedLoadAddress, size, protection, MAP_FIXED | MAP_PRIVATE, fd, fileOffset);
+ void* loadAddress = xmmap((void*)requestedLoadAddress, size, protection, MAP_FIXED | MAP_PRIVATE, fd, fileOffset);
if ( loadAddress == ((void*)(-1)) ) {
- 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());
+ 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());
}
}
// update stats
}
}
+#if TEXT_RELOC_SUPPORT
void ImageLoaderMachO::segMakeWritable(unsigned int segIndex, const ImageLoader::LinkContext& context)
{
vm_address_t addr = segActualLoadAddress(segIndex);
vm_size_t size = segSize(segIndex);
const bool setCurrentPermissions = false;
- vm_prot_t protection = VM_PROT_WRITE | VM_PROT_READ;
+ vm_prot_t protection = VM_PROT_WRITE | VM_PROT_READ | VM_PROT_COPY;
if ( segExecutable(segIndex) && !segHasRebaseFixUps(segIndex) )
protection |= VM_PROT_EXECUTE;
kern_return_t r = vm_protect(mach_task_self(), addr, size, setCurrentPermissions, protection);
(protection & PROT_READ) ? 'r' : '.', (protection & PROT_WRITE) ? 'w' : '.', (protection & PROT_EXEC) ? 'x' : '.' );
}
}
+#endif
+
+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;
+}
+
+
+uintptr_t ImageLoaderMachO::imageBaseAddress() const {
+ //printf("imageBaseAddress: %s %d->%d\n", getPath(), 0, segmentCount());
+ for (unsigned int i = 0, e = segmentCount(); i != e; ++i) {
+ if ( (segFileOffset(i) == 0) && (segFileSize(i) != 0) )
+ return segPreferredLoadAddress(i);
+ }
+ return 0;
+}
projects / apple / dyld.git / blobdiff