Loading...
--- dyld/dyld-635.2/dyld3/Loading.cpp
+++ /dev/null
@@ -1,875 +0,0 @@
-/*
- * Copyright (c) 2017 Apple Inc. All rights reserved.
- *
- * @APPLE_LICENSE_HEADER_START@
- *
- * This file contains Original Code and/or Modifications of Original Code
- * as defined in and that are subject to the Apple Public Source License
- * Version 2.0 (the 'License'). You may not use this file except in
- * compliance with the License. Please obtain a copy of the License at
- * http://www.opensource.apple.com/apsl/ and read it before using this
- * file.
- *
- * The Original Code and all software distributed under the License are
- * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
- * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
- * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
- * Please see the License for the specific language governing rights and
- * limitations under the License.
- *
- * @APPLE_LICENSE_HEADER_END@
- */
-
-
-#include <bitset>
-
-#include <stdint.h>
-#include <string.h>
-#include <assert.h>
-#include <uuid/uuid.h>
-#include <mach/mach.h>
-#include <sys/stat.h>
-#include <sys/types.h>
-#include <sys/sysctl.h>
-#include <fcntl.h>
-#include <sys/dtrace.h>
-#include <sys/errno.h>
-#include <unistd.h>
-#include <System/sys/mman.h>
-#include <System/sys/csr.h>
-#include <System/machine/cpu_capabilities.h>
-#include <bootstrap.h>
-#include <CommonCrypto/CommonDigest.h>
-#include <sandbox.h>
-#include <sandbox/private.h>
-#include <dispatch/dispatch.h>
-#include <mach/vm_page_size.h>
-
-#include "MachOFile.h"
-#include "MachOLoaded.h"
-#include "Logging.h"
-#include "Loading.h"
-#include "Tracing.h"
-#include "dyld.h"
-#include "dyld_cache_format.h"
-
-
-namespace dyld {
- void log(const char* m, ...);
-}
-
-
-namespace {
-
-// utility to track a set of ImageNum's in use
-class VIS_HIDDEN ImageNumSet
-{
-public:
- void add(dyld3::closure::ImageNum num);
- bool contains(dyld3::closure::ImageNum num) const;
-
-private:
- std::bitset<5120> _bitmap;
- dyld3::OverflowSafeArray<dyld3::closure::ImageNum> _overflowArray;
-};
-
-void ImageNumSet::add(dyld3::closure::ImageNum num)
-{
- if ( num < 5120 )
- _bitmap.set(num);
- else
- _overflowArray.push_back(num);
-}
-
-bool ImageNumSet::contains(dyld3::closure::ImageNum num) const
-{
- if ( num < 5120 )
- return _bitmap.test(num);
-
- for (dyld3::closure::ImageNum existingNum : _overflowArray) {
- if ( existingNum == num )
- return true;
- }
- return false;
-}
-} // namespace anonymous
-
-
-namespace dyld3 {
-
-Loader::Loader(Array<LoadedImage>& storage, const void* cacheAddress, const Array<const dyld3::closure::ImageArray*>& imagesArrays,
- LogFunc logLoads, LogFunc logSegments, LogFunc logFixups, LogFunc logDofs)
- : _allImages(storage), _imagesArrays(imagesArrays), _dyldCacheAddress(cacheAddress),
- _logLoads(logLoads), _logSegments(logSegments), _logFixups(logFixups), _logDofs(logDofs)
-{
-}
-
-void Loader::addImage(const LoadedImage& li)
-{
- _allImages.push_back(li);
-}
-
-LoadedImage* Loader::findImage(closure::ImageNum targetImageNum)
-{
- for (LoadedImage& info : _allImages) {
- if ( info.image()->representsImageNum(targetImageNum) )
- return &info;
- }
- return nullptr;
-}
-
-uintptr_t Loader::resolveTarget(closure::Image::ResolvedSymbolTarget target)
-{
- const LoadedImage* info;
- switch ( target.sharedCache.kind ) {
- case closure::Image::ResolvedSymbolTarget::kindSharedCache:
- assert(_dyldCacheAddress != nullptr);
- return (uintptr_t)_dyldCacheAddress + (uintptr_t)target.sharedCache.offset;
-
- case closure::Image::ResolvedSymbolTarget::kindImage:
- info = findImage(target.image.imageNum);
- assert(info != nullptr);
- return (uintptr_t)(info->loadedAddress()) + (uintptr_t)target.image.offset;
-
- case closure::Image::ResolvedSymbolTarget::kindAbsolute:
- if ( target.absolute.value & (1ULL << 62) )
- return (uintptr_t)(target.absolute.value | 0xC000000000000000ULL);
- else
- return (uintptr_t)target.absolute.value;
- }
- assert(0 && "malformed ResolvedSymbolTarget");
- return 0;
-}
-
-
-void Loader::completeAllDependents(Diagnostics& diag, uintptr_t topIndex)
-{
- // accumulate all image overrides
- STACK_ALLOC_ARRAY(ImageOverride, overrides, _allImages.maxCount());
- for (const auto anArray : _imagesArrays) {
- // ignore prebuilt Image* in dyld cache
- if ( anArray->startImageNum() < dyld3::closure::kFirstLaunchClosureImageNum )
- continue;
- anArray->forEachImage(^(const dyld3::closure::Image* image, bool& stop) {
- ImageOverride overrideEntry;
- if ( image->isOverrideOfDyldCacheImage(overrideEntry.inCache) ) {
- overrideEntry.replacement = image->imageNum();
- overrides.push_back(overrideEntry);
- }
- });
- }
-
- // make cache for fast lookup of already loaded images
- __block ImageNumSet alreadyLoaded;
- for (int i=0; i <= topIndex; ++i) {
- alreadyLoaded.add(_allImages[i].image()->imageNum());
- }
-
- // for each image in _allImages, starting at topIndex, make sure its depenents are in _allImages
- uintptr_t index = topIndex;
- while ( (index < _allImages.count()) && diag.noError() ) {
- const closure::Image* image = _allImages[index].image();
- //fprintf(stderr, "completeAllDependents(): looking at dependents of %s\n", image->path());
- image->forEachDependentImage(^(uint32_t depIndex, closure::Image::LinkKind kind, closure::ImageNum depImageNum, bool& stop) {
- // check if imageNum needs to be changed to an override
- for (const ImageOverride& entry : overrides) {
- if ( entry.inCache == depImageNum ) {
- depImageNum = entry.replacement;
- break;
- }
- }
- // check if this dependent is already loaded
- if ( !alreadyLoaded.contains(depImageNum) ) {
- // if not, look in imagesArrays
- const closure::Image* depImage = closure::ImageArray::findImage(_imagesArrays, depImageNum);
- if ( depImage != nullptr ) {
- //dyld::log(" load imageNum=0x%05X, image path=%s\n", depImageNum, depImage->path());
- if ( _allImages.freeCount() == 0 ) {
- diag.error("too many initial images");
- stop = true;
- }
- else {
- _allImages.push_back(LoadedImage::make(depImage));
- }
- alreadyLoaded.add(depImageNum);
- }
- else {
- diag.error("unable to locate imageNum=0x%04X, depIndex=%d of %s", depImageNum, depIndex, image->path());
- stop = true;
- }
- }
- });
- ++index;
- }
-}
-
-void Loader::mapAndFixupAllImages(Diagnostics& diag, bool processDOFs, bool fromOFI, uintptr_t topIndex)
-{
- // scan array and map images not already loaded
- for (uintptr_t i=topIndex; i < _allImages.count(); ++i) {
- LoadedImage& info = _allImages[i];
- if ( info.loadedAddress() != nullptr ) {
- // log main executable's segments
- if ( (info.loadedAddress()->filetype == MH_EXECUTE) && (info.state() == LoadedImage::State::mapped) ) {
- if ( _logSegments("dyld: mapped by kernel %s\n", info.image()->path()) ) {
- info.image()->forEachDiskSegment(^(uint32_t segIndex, uint32_t fileOffset, uint32_t fileSize, int64_t vmOffset, uint64_t vmSize, uint8_t permissions, bool& stop) {
- uint64_t start = (long)info.loadedAddress() + vmOffset;
- uint64_t end = start+vmSize-1;
- if ( (segIndex == 0) && (permissions == 0) ) {
- start = 0;
- }
- _logSegments("%14s (%c%c%c) 0x%012llX->0x%012llX \n", info.loadedAddress()->segmentName(segIndex),
- (permissions & PROT_READ) ? 'r' : '.', (permissions & PROT_WRITE) ? 'w' : '.', (permissions & PROT_EXEC) ? 'x' : '.' ,
- start, end);
- });
- }
- }
- // skip over ones already loaded
- continue;
- }
- if ( info.image()->inDyldCache() ) {
- if ( info.image()->overridableDylib() ) {
- struct stat statBuf;
- if ( stat(info.image()->path(), &statBuf) == 0 ) {
- // verify file has not changed since closure was built
- uint64_t inode;
- uint64_t mtime;
- if ( info.image()->hasFileModTimeAndInode(inode, mtime) ) {
- if ( (statBuf.st_mtime != mtime) || (statBuf.st_ino != inode) ) {
- diag.error("dylib file mtime/inode changed since closure was built for '%s'", info.image()->path());
- }
- }
- else {
- diag.error("dylib file not expected on disk, must be a root '%s'", info.image()->path());
- }
- }
- else if ( (_dyldCacheAddress != nullptr) && ((dyld_cache_header*)_dyldCacheAddress)->dylibsExpectedOnDisk ) {
- diag.error("dylib file missing, was in dyld shared cache '%s'", info.image()->path());
- }
- }
- if ( diag.noError() ) {
- info.setLoadedAddress((MachOLoaded*)((uintptr_t)_dyldCacheAddress + info.image()->cacheOffset()));
- info.setState(LoadedImage::State::fixedUp);
- if ( _logSegments("dyld: Using from dyld cache %s\n", info.image()->path()) ) {
- info.image()->forEachCacheSegment(^(uint32_t segIndex, uint64_t vmOffset, uint64_t vmSize, uint8_t permissions, bool &stop) {
- _logSegments("%14s (%c%c%c) 0x%012lX->0x%012lX \n", info.loadedAddress()->segmentName(segIndex),
- (permissions & PROT_READ) ? 'r' : '.', (permissions & PROT_WRITE) ? 'w' : '.', (permissions & PROT_EXEC) ? 'x' : '.' ,
- (long)info.loadedAddress()+(long)vmOffset, (long)info.loadedAddress()+(long)vmOffset+(long)vmSize-1);
- });
- }
- }
- }
- else {
- mapImage(diag, info, fromOFI);
- if ( diag.hasError() )
- break; // out of for loop
- }
-
- }
- if ( diag.hasError() ) {
- // bummer, need to clean up by unmapping any images just mapped
- for (LoadedImage& info : _allImages) {
- if ( (info.state() == LoadedImage::State::mapped) && !info.image()->inDyldCache() && !info.leaveMapped() ) {
- _logSegments("dyld: unmapping %s\n", info.image()->path());
- unmapImage(info);
- }
- }
- return;
- }
-
- // apply fixups
- for (uintptr_t i=topIndex; i < _allImages.count(); ++i) {
- LoadedImage& info = _allImages[i];
- // images in shared cache do not need fixups applied
- if ( info.image()->inDyldCache() )
- continue;
- // previously loaded images were previously fixed up
- if ( info.state() < LoadedImage::State::fixedUp ) {
- applyFixupsToImage(diag, info);
- if ( diag.hasError() )
- break;
- info.setState(LoadedImage::State::fixedUp);
- }
- }
-
- // find and register dtrace DOFs
- if ( processDOFs ) {
- STACK_ALLOC_OVERFLOW_SAFE_ARRAY(DOFInfo, dofImages, _allImages.count());
- for (uintptr_t i=topIndex; i < _allImages.count(); ++i) {
- LoadedImage& info = _allImages[i];
- info.image()->forEachDOF(info.loadedAddress(), ^(const void* section) {
- DOFInfo dofInfo;
- dofInfo.dof = section;
- dofInfo.imageHeader = info.loadedAddress();
- dofInfo.imageShortName = info.image()->leafName();
- dofImages.push_back(dofInfo);
- });
- }
- registerDOFs(dofImages);
- }
-}
-
-bool Loader::sandboxBlocked(const char* path, const char* kind)
-{
-#if TARGET_IPHONE_SIMULATOR
- // sandbox calls not yet supported in dyld_sim
- return false;
-#else
- sandbox_filter_type filter = (sandbox_filter_type)(SANDBOX_FILTER_PATH | SANDBOX_CHECK_NO_REPORT);
- return ( sandbox_check(getpid(), kind, filter, path) > 0 );
-#endif
-}
-
-bool Loader::sandboxBlockedMmap(const char* path)
-{
- return sandboxBlocked(path, "file-map-executable");
-}
-
-bool Loader::sandboxBlockedOpen(const char* path)
-{
- return sandboxBlocked(path, "file-read-data");
-}
-
-bool Loader::sandboxBlockedStat(const char* path)
-{
- return sandboxBlocked(path, "file-read-metadata");
-}
-
-void Loader::mapImage(Diagnostics& diag, LoadedImage& info, bool fromOFI)
-{
- dyld3::ScopedTimer timer(DBG_DYLD_TIMING_MAP_IMAGE, info.image()->path(), 0, 0);
-
- const closure::Image* image = info.image();
- uint64_t sliceOffset = image->sliceOffsetInFile();
- const uint64_t totalVMSize = image->vmSizeToMap();
- uint32_t codeSignFileOffset;
- uint32_t codeSignFileSize;
- bool isCodeSigned = image->hasCodeSignature(codeSignFileOffset, codeSignFileSize);
-
- // open file
- int fd = ::open(info.image()->path(), O_RDONLY, 0);
- if ( fd == -1 ) {
- int openErr = errno;
- if ( (openErr == EPERM) && sandboxBlockedOpen(image->path()) )
- diag.error("file system sandbox blocked open(\"%s\", O_RDONLY)", image->path());
- else
- diag.error("open(\"%s\", O_RDONLY) failed with errno=%d", image->path(), openErr);
- return;
- }
-
- // get file info
- struct stat statBuf;
-#if TARGET_IPHONE_SIMULATOR
- if ( stat(image->path(), &statBuf) != 0 ) {
-#else
- if ( fstat(fd, &statBuf) != 0 ) {
-#endif
- int statErr = errno;
- if ( (statErr == EPERM) && sandboxBlockedStat(image->path()) )
- diag.error("file system sandbox blocked stat(\"%s\")", image->path());
- else
- diag.error("stat(\"%s\") failed with errno=%d", image->path(), statErr);
- close(fd);
- return;
- }
-
- // verify file has not changed since closure was built
- uint64_t inode;
- uint64_t mtime;
- if ( image->hasFileModTimeAndInode(inode, mtime) ) {
- if ( (statBuf.st_mtime != mtime) || (statBuf.st_ino != inode) ) {
- diag.error("file mtime/inode changed since closure was built for '%s'", image->path());
- close(fd);
- return;
- }
- }
-
- // handle case on iOS where sliceOffset in closure is wrong because file was thinned after cache was built
- if ( (_dyldCacheAddress != nullptr) && !(((dyld_cache_header*)_dyldCacheAddress)->dylibsExpectedOnDisk) ) {
- if ( sliceOffset != 0 ) {
- if ( round_page_kernel(codeSignFileOffset+codeSignFileSize) == round_page_kernel(statBuf.st_size) ) {
- // file is now thin
- sliceOffset = 0;
- }
- }
- }
-
- // register code signature
- uint64_t coveredCodeLength = UINT64_MAX;
- if ( isCodeSigned ) {
- auto sigTimer = ScopedTimer(DBG_DYLD_TIMING_ATTACH_CODESIGNATURE, 0, 0, 0);
- fsignatures_t siginfo;
- siginfo.fs_file_start = sliceOffset; // start of mach-o slice in fat file
- siginfo.fs_blob_start = (void*)(long)(codeSignFileOffset); // start of CD in mach-o file
- siginfo.fs_blob_size = codeSignFileSize; // size of CD
- int result = fcntl(fd, F_ADDFILESIGS_RETURN, &siginfo);
- if ( result == -1 ) {
- int errnoCopy = errno;
- if ( (errnoCopy == EPERM) || (errnoCopy == EBADEXEC) ) {
- diag.error("code signature invalid (errno=%d) sliceOffset=0x%08llX, codeBlobOffset=0x%08X, codeBlobSize=0x%08X for '%s'",
- errnoCopy, sliceOffset, codeSignFileOffset, codeSignFileSize, image->path());
- }
- else {
- diag.error("fcntl(fd, F_ADDFILESIGS_RETURN) failed with errno=%d, sliceOffset=0x%08llX, codeBlobOffset=0x%08X, codeBlobSize=0x%08X for '%s'",
- errnoCopy, sliceOffset, codeSignFileOffset, codeSignFileSize, image->path());
- }
- close(fd);
- return;
- }
- coveredCodeLength = siginfo.fs_file_start;
- if ( coveredCodeLength < codeSignFileOffset ) {
- diag.error("code signature does not cover entire file up to signature");
- close(fd);
- return;
- }
- }
-
- // <rdar://problem/41015217> dyld should use F_CHECK_LV even on unsigned binaries
- {
- // <rdar://problem/32684903> always call F_CHECK_LV to preflight
- fchecklv checkInfo;
- char messageBuffer[512];
- messageBuffer[0] = '\0';
- checkInfo.lv_file_start = sliceOffset;
- checkInfo.lv_error_message_size = sizeof(messageBuffer);
- checkInfo.lv_error_message = messageBuffer;
- int res = fcntl(fd, F_CHECK_LV, &checkInfo);
- if ( res == -1 ) {
- diag.error("code signature in (%s) not valid for use in process: %s", image->path(), messageBuffer);
- close(fd);
- return;
- }
- }
-
- // reserve address range
- vm_address_t loadAddress = 0;
- kern_return_t r = vm_allocate(mach_task_self(), &loadAddress, (vm_size_t)totalVMSize, VM_FLAGS_ANYWHERE);
- if ( r != KERN_SUCCESS ) {
- diag.error("vm_allocate(size=0x%0llX) failed with result=%d", totalVMSize, r);
- close(fd);
- return;
- }
-
- if ( sliceOffset != 0 )
- _logSegments("dyld: Mapping %s (slice offset=%llu)\n", image->path(), sliceOffset);
- else
- _logSegments("dyld: Mapping %s\n", image->path());
-
- // map each segment
- __block bool mmapFailure = false;
- __block const uint8_t* codeSignatureStartAddress = nullptr;
- __block const uint8_t* linkeditEndAddress = nullptr;
- __block bool mappedFirstSegment = false;
- image->forEachDiskSegment(^(uint32_t segIndex, uint32_t fileOffset, uint32_t fileSize, int64_t vmOffset, uint64_t vmSize, uint8_t permissions, bool& stop) {
- // <rdar://problem/32363581> Mapping zero filled segments fails with mmap of size 0
- if ( fileSize == 0 )
- return;
- void* segAddress = mmap((void*)(loadAddress+vmOffset), fileSize, permissions, MAP_FIXED | MAP_PRIVATE, fd, sliceOffset+fileOffset);
- int mmapErr = errno;
- if ( segAddress == MAP_FAILED ) {
- if ( mmapErr == EPERM ) {
- if ( sandboxBlockedMmap(image->path()) )
- diag.error("file system sandbox blocked mmap() of '%s'", image->path());
- else
- diag.error("code signing blocked mmap() of '%s'", image->path());
- }
- else {
- diag.error("mmap(addr=0x%0llX, size=0x%08X) failed with errno=%d for %s", loadAddress+vmOffset, fileSize, mmapErr, image->path());
- }
- mmapFailure = true;
- stop = true;
- }
- else if ( codeSignFileOffset > fileOffset ) {
- codeSignatureStartAddress = (uint8_t*)segAddress + (codeSignFileOffset-fileOffset);
- linkeditEndAddress = (uint8_t*)segAddress + vmSize;
- }
- // sanity check first segment is mach-o header
- if ( (segAddress != MAP_FAILED) && !mappedFirstSegment ) {
- mappedFirstSegment = true;
- const MachOFile* mf = (MachOFile*)segAddress;
- if ( !mf->isMachO(diag, fileSize) ) {
- mmapFailure = true;
- stop = true;
- }
- }
- if ( !mmapFailure ) {
- const MachOLoaded* lmo = (MachOLoaded*)loadAddress;
- _logSegments("%14s (%c%c%c) 0x%012lX->0x%012lX \n", lmo->segmentName(segIndex),
- (permissions & PROT_READ) ? 'r' : '.', (permissions & PROT_WRITE) ? 'w' : '.', (permissions & PROT_EXEC) ? 'x' : '.' ,
- (long)segAddress, (long)segAddress+(long)vmSize-1);
- }
- });
- if ( mmapFailure ) {
- ::vm_deallocate(mach_task_self(), loadAddress, (vm_size_t)totalVMSize);
- ::close(fd);
- return;
- }
-
- // close file
- close(fd);
-
-#if BUILDING_LIBDYLD
- // verify file has not changed since closure was built by checking code signature has not changed
- uint8_t cdHashExpected[20];
- if ( image->hasCdHash(cdHashExpected) ) {
- if ( codeSignatureStartAddress == nullptr ) {
- diag.error("code signature missing");
- }
- else if ( codeSignatureStartAddress+codeSignFileSize > linkeditEndAddress ) {
- diag.error("code signature extends beyond end of __LINKEDIT");
- }
- else {
- uint8_t cdHashFound[20];
- const MachOLoaded* lmo = (MachOLoaded*)loadAddress;
- if ( lmo->cdHashOfCodeSignature(codeSignatureStartAddress, codeSignFileSize, cdHashFound) ) {
- if ( ::memcmp(cdHashFound, cdHashExpected, 20) != 0 )
- diag.error("code signature changed since closure was built");
- }
- else {
- diag.error("code signature format invalid");
- }
- }
- if ( diag.hasError() ) {
- ::vm_deallocate(mach_task_self(), loadAddress, (vm_size_t)totalVMSize);
- return;
- }
- }
-#endif
-
-#if __IPHONE_OS_VERSION_MIN_REQUIRED && !TARGET_IPHONE_SIMULATOR
- // tell kernel about fairplay encrypted regions
- uint32_t fpTextOffset;
- uint32_t fpSize;
- if ( image->isFairPlayEncrypted(fpTextOffset, fpSize) ) {
- const mach_header* mh = (mach_header*)loadAddress;
- int result = ::mremap_encrypted(((uint8_t*)mh) + fpTextOffset, fpSize, 1, mh->cputype, mh->cpusubtype);
- if ( result != 0 ) {
- diag.error("could not register fairplay decryption, mremap_encrypted() => %d", result);
- ::vm_deallocate(mach_task_self(), loadAddress, (vm_size_t)totalVMSize);
- return;
- }
- }
-#endif
-
- _logLoads("dyld: load %s\n", image->path());
-
- timer.setData4((uint64_t)loadAddress);
- info.setLoadedAddress((MachOLoaded*)loadAddress);
- info.setState(LoadedImage::State::mapped);
-}
-
-void Loader::unmapImage(LoadedImage& info)
-{
- assert(info.loadedAddress() != nullptr);
- ::vm_deallocate(mach_task_self(), (vm_address_t)info.loadedAddress(), (vm_size_t)(info.image()->vmSizeToMap()));
- info.setLoadedAddress(nullptr);
-}
-
-void Loader::registerDOFs(const Array<DOFInfo>& dofs)
-{
- if ( dofs.empty() )
- return;
-
- int fd = open("/dev/" DTRACEMNR_HELPER, O_RDWR);
- if ( fd < 0 ) {
- _logDofs("can't open /dev/" DTRACEMNR_HELPER " to register dtrace DOF sections\n");
- }
- else {
- // allocate a buffer on the stack for the variable length dof_ioctl_data_t type
- uint8_t buffer[sizeof(dof_ioctl_data_t) + dofs.count()*sizeof(dof_helper_t)];
- dof_ioctl_data_t* ioctlData = (dof_ioctl_data_t*)buffer;
-
- // fill in buffer with one dof_helper_t per DOF section
- ioctlData->dofiod_count = dofs.count();
- for (unsigned int i=0; i < dofs.count(); ++i) {
- strlcpy(ioctlData->dofiod_helpers[i].dofhp_mod, dofs[i].imageShortName, DTRACE_MODNAMELEN);
- ioctlData->dofiod_helpers[i].dofhp_dof = (uintptr_t)(dofs[i].dof);
- ioctlData->dofiod_helpers[i].dofhp_addr = (uintptr_t)(dofs[i].dof);
- }
-
- // tell kernel about all DOF sections en mas
- // pass pointer to ioctlData because ioctl() only copies a fixed size amount of data into kernel
- user_addr_t val = (user_addr_t)(unsigned long)ioctlData;
- if ( ioctl(fd, DTRACEHIOC_ADDDOF, &val) != -1 ) {
- // kernel returns a unique identifier for each section in the dofiod_helpers[].dofhp_dof field.
- // Note, the closure marked the image as being never unload, so we don't need to keep the ID around
- // or support unregistering it later.
- for (unsigned int i=0; i < dofs.count(); ++i) {
- _logDofs("dyld: registering DOF section %p in %s with dtrace, ID=0x%08X\n",
- dofs[i].dof, dofs[i].imageShortName, (int)(ioctlData->dofiod_helpers[i].dofhp_dof));
- }
- }
- else {
- _logDofs("dyld: ioctl to register dtrace DOF section failed\n");
- }
- close(fd);
- }
-}
-
-bool Loader::dtraceUserProbesEnabled()
-{
-#if __IPHONE_OS_VERSION_MIN_REQUIRED && !TARGET_IPHONE_SIMULATOR
- int dof_mode;
- size_t dof_mode_size = sizeof(dof_mode);
- if ( sysctlbyname("kern.dtrace.dof_mode", &dof_mode, &dof_mode_size, nullptr, 0) == 0 ) {
- return ( dof_mode != 0 );
- }
- return false;
-#else
- // dtrace is always available for macOS and simulators
- return true;
-#endif
-}
-
-
-void Loader::vmAccountingSetSuspended(bool suspend, LogFunc logger)
-{
-#if __arm__ || __arm64__
- // <rdar://problem/29099600> dyld should tell the kernel when it is doing fix-ups caused by roots
- logger("vm.footprint_suspend=%d\n", suspend);
- int newValue = suspend ? 1 : 0;
- int oldValue = 0;
- size_t newlen = sizeof(newValue);
- size_t oldlen = sizeof(oldValue);
- sysctlbyname("vm.footprint_suspend", &oldValue, &oldlen, &newValue, newlen);
-#endif
-}
-
-void Loader::applyFixupsToImage(Diagnostics& diag, LoadedImage& info)
-{
- dyld3::ScopedTimer timer(DBG_DYLD_TIMING_APPLY_FIXUPS, (uint64_t)info.loadedAddress(), 0, 0);
- closure::ImageNum cacheImageNum;
- const char* leafName = info.image()->leafName();
- const closure::Image* image = info.image();
- const uint8_t* imageLoadAddress = (uint8_t*)info.loadedAddress();
- uintptr_t slide = info.loadedAddress()->getSlide();
- bool overrideOfCache = info.image()->isOverrideOfDyldCacheImage(cacheImageNum);
- if ( overrideOfCache )
- vmAccountingSetSuspended(true, _logFixups);
- image->forEachFixup(^(uint64_t imageOffsetToRebase, bool &stop) {
- uintptr_t* fixUpLoc = (uintptr_t*)(imageLoadAddress + imageOffsetToRebase);
- *fixUpLoc += slide;
- _logFixups("dyld: fixup: %s:%p += %p\n", leafName, fixUpLoc, (void*)slide);
- },
- ^(uint64_t imageOffsetToBind, closure::Image::ResolvedSymbolTarget bindTarget, bool &stop) {
- uintptr_t* fixUpLoc = (uintptr_t*)(imageLoadAddress + imageOffsetToBind);
- uintptr_t value = resolveTarget(bindTarget);
- _logFixups("dyld: fixup: %s:%p = %p\n", leafName, fixUpLoc, (void*)value);
- *fixUpLoc = value;
- },
- ^(uint64_t imageOffsetStart, const Array<closure::Image::ResolvedSymbolTarget>& targets, bool& stop) {
- // walk each fixup in the chain
- image->forEachChainedFixup((void*)imageLoadAddress, imageOffsetStart, ^(uint64_t* fixupLoc, MachOLoaded::ChainedFixupPointerOnDisk fixupInfo, bool& stopChain) {
- if ( fixupInfo.authRebase.auth ) {
- #if __has_feature(ptrauth_calls)
- if ( fixupInfo.authBind.bind ) {
- closure::Image::ResolvedSymbolTarget bindTarget = targets[fixupInfo.authBind.ordinal];
- uint64_t targetAddr = resolveTarget(bindTarget);
- // Don't sign missing weak imports.
- if (targetAddr != 0)
- targetAddr = fixupInfo.signPointer(fixupLoc, targetAddr);
- _logFixups("dyld: fixup: *%p = %p (JOP: diversity 0x%04X, addr-div=%d, key=%s)\n",
- fixupLoc, (void*)targetAddr, fixupInfo.authBind.diversity, fixupInfo.authBind.addrDiv, fixupInfo.authBind.keyName());
- *fixupLoc = targetAddr;
- }
- else {
- uint64_t targetAddr = (uint64_t)imageLoadAddress + fixupInfo.authRebase.target;
- targetAddr = fixupInfo.signPointer(fixupLoc, targetAddr);
- _logFixups("dyld: fixup: *%p = %p (JOP: diversity 0x%04X, addr-div=%d, key=%s)\n",
- fixupLoc, (void*)targetAddr, fixupInfo.authRebase.diversity, fixupInfo.authRebase.addrDiv, fixupInfo.authRebase.keyName());
- *fixupLoc = targetAddr;
- }
- #else
- diag.error("malformed chained pointer");
- stop = true;
- stopChain = true;
- #endif
- }
- else {
- if ( fixupInfo.plainRebase.bind ) {
- closure::Image::ResolvedSymbolTarget bindTarget = targets[fixupInfo.plainBind.ordinal];
- uint64_t targetAddr = resolveTarget(bindTarget) + fixupInfo.plainBind.signExtendedAddend();
- _logFixups("dyld: fixup: %s:%p = %p\n", leafName, fixupLoc, (void*)targetAddr);
- *fixupLoc = targetAddr;
- }
- else {
- uint64_t targetAddr = fixupInfo.plainRebase.signExtendedTarget() + slide;
- _logFixups("dyld: fixup: %s:%p += %p\n", leafName, fixupLoc, (void*)slide);
- *fixupLoc = targetAddr;
- }
- }
- });
- });
-
-#if __i386__
- __block bool segmentsMadeWritable = false;
- image->forEachTextReloc(^(uint32_t imageOffsetToRebase, bool& stop) {
- if ( !segmentsMadeWritable )
- setSegmentProtects(info, true);
- uintptr_t* fixUpLoc = (uintptr_t*)(imageLoadAddress + imageOffsetToRebase);
- *fixUpLoc += slide;
- _logFixups("dyld: fixup: %s:%p += %p\n", leafName, fixUpLoc, (void*)slide);
- },
- ^(uint32_t imageOffsetToBind, closure::Image::ResolvedSymbolTarget bindTarget, bool& stop) {
- // FIXME
- });
- if ( segmentsMadeWritable )
- setSegmentProtects(info, false);
-#endif
-
- if ( overrideOfCache )
- vmAccountingSetSuspended(false, _logFixups);
-}
-
-#if __i386__
-void Loader::setSegmentProtects(const LoadedImage& info, bool write)
-{
- info.image()->forEachDiskSegment(^(uint32_t segIndex, uint32_t fileOffset, uint32_t fileSize, int64_t vmOffset, uint64_t vmSize, uint8_t protections, bool& segStop) {
- if ( protections & VM_PROT_WRITE )
- return;
- uint32_t regionProt = protections;
- if ( write )
- regionProt = VM_PROT_WRITE | VM_PROT_READ;
- kern_return_t r = vm_protect(mach_task_self(), ((uintptr_t)info.loadedAddress())+(uintptr_t)vmOffset, (uintptr_t)vmSize, false, regionProt);
- assert( r == KERN_SUCCESS );
- });
-}
-#endif
-
-#if BUILDING_DYLD
-void forEachLineInFile(const char* buffer, size_t bufferLen, void (^lineHandler)(const char* line, bool& stop))
-{
- bool stop = false;
- const char* const eof = &buffer[bufferLen];
- for (const char* s = buffer; s < eof; ++s) {
- char lineBuffer[MAXPATHLEN];
- char* t = lineBuffer;
- char* tEnd = &lineBuffer[MAXPATHLEN];
- while ( (s < eof) && (t != tEnd) ) {
- if ( *s == '\n' )
- break;
- *t++ = *s++;
- }
- *t = '\0';
- lineHandler(lineBuffer, stop);
- if ( stop )
- break;
- }
-}
-
-void forEachLineInFile(const char* path, void (^lineHandler)(const char* line, bool& stop))
-{
- int fd = dyld::my_open(path, O_RDONLY, 0);
- if ( fd != -1 ) {
- struct stat statBuf;
- if ( fstat(fd, &statBuf) == 0 ) {
- const char* lines = (const char*)mmap(nullptr, (size_t)statBuf.st_size, PROT_READ, MAP_PRIVATE, fd, 0);
- if ( lines != MAP_FAILED ) {
- forEachLineInFile(lines, (size_t)statBuf.st_size, lineHandler);
- munmap((void*)lines, (size_t)statBuf.st_size);
- }
- }
- close(fd);
- }
-}
-
-
-bool internalInstall()
-{
-#if TARGET_IPHONE_SIMULATOR
- return false;
-#elif __IPHONE_OS_VERSION_MIN_REQUIRED
- uint32_t devFlags = *((uint32_t*)_COMM_PAGE_DEV_FIRM);
- return ( (devFlags & 1) == 1 );
-#else
- return ( csr_check(CSR_ALLOW_APPLE_INTERNAL) == 0 );
-#endif
-}
-
-/* Checks to see if there are any args that impact dyld. These args
- * can be set sevaral ways. These will only be honored on development
- * and Apple Internal builds.
- *
- * First the existence of a file is checked for:
- * /S/L/C/com.apple.dyld/dyld-bootargs
- * If it exists it will be mapped and scanned line by line. If the executable
- * exists in the file then the arguments on its line will be applied. "*" may
- * be used a wildcard to represent all apps. First matching line will be used,
- * the wild card must be one the last line. Additionally, lines must end with
- * a "\n"
- *
- *
- * SAMPLE FILE:
-
- /bin/ls:force_dyld2=1
- /usr/bin/sw_vers:force_dyld2=1
-*:force_dyld3=1
-EOL
-
- If no file exists then the kernel boot-args will be scanned.
- */
-bool bootArgsContains(const char* arg)
-{
- //FIXME: Use strnstr(). Unfortunately we are missing an imp libc.
-#if TARGET_IPHONE_SIMULATOR
- return false;
-#else
- // don't check for boot-args on customer installs
- if ( !internalInstall() )
- return false;
-
- char pathBuffer[MAXPATHLEN+1];
-#if __IPHONE_OS_VERSION_MIN_REQUIRED
- strlcpy(pathBuffer, IPHONE_DYLD_SHARED_CACHE_DIR, sizeof(IPHONE_DYLD_SHARED_CACHE_DIR));
-#else
- strlcpy(pathBuffer, MACOSX_DYLD_SHARED_CACHE_DIR, sizeof(MACOSX_DYLD_SHARED_CACHE_DIR));
-#endif
- strlcat(pathBuffer, "dyld-bootargs", MAXPATHLEN+1);
- __block bool result = false;
- forEachLineInFile(pathBuffer, ^(const char* line, bool& stop) {
- const char* delim = strchr(line, ':');
- if ( delim == nullptr )
- return;
- char binary[MAXPATHLEN];
- char options[MAXPATHLEN];
- strlcpy(binary, line, MAXPATHLEN);
- binary[delim-line] = '\0';
- strlcpy(options, delim+1, MAXPATHLEN);
- if ( (strcmp(dyld::getExecutablePath(), binary) == 0) || (strcmp("*", binary) == 0) ) {
- result = (strstr(options, arg) != nullptr);
- return;
- }
- });
-
- // get length of full boot-args string
- size_t len;
- if ( sysctlbyname("kern.bootargs", NULL, &len, NULL, 0) != 0 )
- return false;
-
- // get copy of boot-args string
- char bootArgsBuffer[len];
- if ( sysctlbyname("kern.bootargs", bootArgsBuffer, &len, NULL, 0) != 0 )
- return false;
-
- // return true if 'arg' is a sub-string of boot-args
- return (strstr(bootArgsBuffer, arg) != nullptr);
-#endif
-}
-#endif
-
-#if BUILDING_LIBDYLD
-// hack because libdyld.dylib should not link with libc++.dylib
-extern "C" void __cxa_pure_virtual() __attribute__((visibility("hidden")));
-void __cxa_pure_virtual()
-{
- abort();
-}
-#endif
-
-} // namespace dyld3
-
-
-
-
-