Loading...
--- /dev/null
+++ dyld/dyld-519.2.2/dyld3/Loading.cpp
@@ -0,0 +1,804 @@
+/*
+ * 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 <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 "LaunchCache.h"
+#include "LaunchCacheFormat.h"
+#include "Logging.h"
+#include "Loading.h"
+#include "MachOParser.h"
+#include "dyld.h"
+#include "dyld_cache_format.h"
+
+extern "C" {
+ #include "closuredProtocol.h"
+}
+
+namespace dyld {
+ void log(const char* m, ...);
+}
+
+namespace dyld3 {
+namespace loader {
+
+#if DYLD_IN_PROCESS
+
+static bool sandboxBlocked(const char* path, const char* kind)
+{
+#if BUILDING_LIBDYLD || !TARGET_IPHONE_SIMULATOR
+ sandbox_filter_type filter = (sandbox_filter_type)(SANDBOX_FILTER_PATH | SANDBOX_CHECK_NO_REPORT);
+ return ( sandbox_check(getpid(), kind, filter, path) > 0 );
+#else
+ // sandbox calls not yet supported in dyld_sim
+ return false;
+#endif
+}
+
+static bool sandboxBlockedMmap(const char* path)
+{
+ return sandboxBlocked(path, "file-map-executable");
+}
+
+static bool sandboxBlockedOpen(const char* path)
+{
+ return sandboxBlocked(path, "file-read-data");
+}
+
+static bool sandboxBlockedStat(const char* path)
+{
+ return sandboxBlocked(path, "file-read-metadata");
+}
+
+#if TARGET_OS_WATCH
+static uint64_t pageAlign(uint64_t value)
+{
+ return (value + 4095) & (-4096);
+}
+#endif
+
+static void updateSliceOffset(uint64_t& sliceOffset, uint64_t codeSignEndOffset, size_t fileLen)
+{
+#if TARGET_OS_WATCH
+ if ( sliceOffset != 0 ) {
+ if ( pageAlign(codeSignEndOffset) == pageAlign(fileLen) ) {
+ // cache builder saw fat file, but file is now thin
+ sliceOffset = 0;
+ return;
+ }
+ }
+#endif
+}
+
+static const mach_header* mapImage(const dyld3::launch_cache::Image image, Diagnostics& diag, LogFunc log_loads, LogFunc log_segments)
+{
+ uint64_t sliceOffset = image.sliceOffsetInFile();
+ const uint64_t totalVMSize = image.vmSizeToMap();
+ const uint32_t codeSignFileOffset = image.asDiskImage()->codeSignFileOffset;
+ const uint32_t codeSignFileSize = image.asDiskImage()->codeSignFileSize;
+
+ // open file
+ int fd = ::open(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 nullptr;
+ }
+
+ // 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 nullptr;
+ }
+
+ // verify file has not changed since closure was built
+ if ( image.validateUsingModTimeAndInode() ) {
+ if ( (statBuf.st_mtime != image.fileModTime()) || (statBuf.st_ino != image.fileINode()) ) {
+ diag.error("file mtime/inode changed since closure was built for '%s'", image.path());
+ close(fd);
+ return nullptr;
+ }
+ }
+
+ // handle OS dylibs being thinned after closure was built
+ if ( image.group().groupNum() == 1 )
+ updateSliceOffset(sliceOffset, codeSignFileOffset+codeSignFileSize, (size_t)statBuf.st_size);
+
+ // register code signature
+ uint64_t coveredCodeLength = UINT64_MAX;
+ if ( codeSignFileOffset != 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 nullptr;
+ }
+ coveredCodeLength = siginfo.fs_file_start;
+ if ( coveredCodeLength < image.asDiskImage()->codeSignFileOffset ) {
+ diag.error("code signature does not cover entire file up to signature");
+ close(fd);
+ return nullptr;
+ }
+
+ // <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 nullptr;
+ }
+ }
+
+ // 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 nullptr;
+ }
+
+ if ( sliceOffset != 0 )
+ log_segments("dyld: Mapping %s (slice offset=%llu)\n", image.path(), sliceOffset);
+ else
+ log_segments("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;
+ if ( !MachOParser::isMachO(diag, segAddress, fileSize) ) {
+ mmapFailure = true;
+ stop = true;
+ }
+ }
+ if ( !mmapFailure ) {
+ MachOParser parser((mach_header*)loadAddress);
+ log_segments("%14s (%c%c%c) 0x%012lX->0x%012lX \n", parser.segmentName(segIndex),
+ (permissions & PROT_READ) ? 'r' : '.', (permissions & PROT_WRITE) ? 'w' : '.', (permissions & PROT_EXEC) ? 'x' : '.' ,
+ (long)segAddress, (long)segAddress+vmSize-1);
+ }
+ });
+ if ( mmapFailure ) {
+ vm_deallocate(mach_task_self(), loadAddress, (vm_size_t)totalVMSize);
+ close(fd);
+ return nullptr;
+ }
+
+ // close file
+ close(fd);
+
+ #if BUILDING_LIBDYLD
+ // verify file has not changed since closure was built by checking code signature has not changed
+ if ( image.validateUsingCdHash() ) {
+ 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 cdHash[20];
+ if ( MachOParser::cdHashOfCodeSignature(codeSignatureStartAddress, codeSignFileSize, cdHash) ) {
+ if ( memcmp(image.cdHash16(), cdHash, 16) != 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 nullptr;
+ }
+ }
+#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);
+ diag.error("could not register fairplay decryption, mremap_encrypted() => %d", result);
+ vm_deallocate(mach_task_self(), loadAddress, (vm_size_t)totalVMSize);
+ return nullptr;
+ }
+#endif
+
+ log_loads("dyld: load %s\n", image.path());
+
+ return (mach_header*)loadAddress;
+}
+
+
+void unmapImage(const launch_cache::binary_format::Image* binImage, const mach_header* loadAddress)
+{
+ assert(loadAddress != nullptr);
+ launch_cache::Image image(binImage);
+ vm_deallocate(mach_task_self(), (vm_address_t)loadAddress, (vm_size_t)(image.vmSizeToMap()));
+}
+
+
+static void applyFixupsToImage(Diagnostics& diag, const mach_header* imageMH, const launch_cache::binary_format::Image* imageData,
+ launch_cache::TargetSymbolValue::LoadedImages& imageResolver, LogFunc log_fixups)
+{
+ launch_cache::Image image(imageData);
+ MachOParser imageParser(imageMH);
+ // Note, these are cached here to avoid recalculating them on every loop iteration
+ const launch_cache::ImageGroup& imageGroup = image.group();
+ const char* leafName = image.leafName();
+ intptr_t slide = imageParser.getSlide();
+ image.forEachDiskSegment(^(uint32_t segIndex, uint32_t fileOffset, uint32_t fileSize, int64_t vmOffset, uint64_t vmSize, uint8_t protections, bool& segStop) {
+ if ( !image.segmentHasFixups(segIndex) )
+ return;
+ const launch_cache::MemoryRange segContent = { (char*)imageMH + vmOffset, vmSize };
+ #if __i386__
+ bool textRelocs = ((protections & VM_PROT_WRITE) == 0);
+ if ( textRelocs ) {
+ kern_return_t r = vm_protect(mach_task_self(), (vm_address_t)segContent.address, (vm_size_t)segContent.size, false, VM_PROT_WRITE | VM_PROT_READ);
+ if ( r != KERN_SUCCESS ) {
+ diag.error("vm_protect() failed trying to make text segment writable, result=%d", r);
+ return;
+ }
+ }
+ #else
+ if ( (protections & VM_PROT_WRITE) == 0 ) {
+ diag.error("fixups found in non-writable segment of %s", image.path());
+ return;
+ }
+ #endif
+ image.forEachFixup(segIndex, segContent, ^(uint64_t segOffset, launch_cache::Image::FixupKind kind, launch_cache::TargetSymbolValue targetValue, bool& stop) {
+ if ( segOffset > segContent.size ) {
+ diag.error("fixup is past end of segment. segOffset=0x%0llX, segSize=0x%0llX, segIndex=%d", segOffset, segContent.size, segIndex);
+ stop = true;
+ return;
+ }
+ uintptr_t* fixUpLoc = (uintptr_t*)((char*)(segContent.address) + segOffset);
+ uintptr_t value;
+ #if __i386__
+ uint32_t rel32;
+ uint8_t* jumpSlot;
+ #endif
+ //dyld::log("fixup loc=%p\n", fixUpLoc);
+ switch ( kind ) {
+ #if __LP64__
+ case launch_cache::Image::FixupKind::rebase64:
+ #else
+ case launch_cache::Image::FixupKind::rebase32:
+ #endif
+ *fixUpLoc += slide;
+ log_fixups("dyld: fixup: %s:%p += %p\n", leafName, fixUpLoc, (void*)slide);
+ break;
+ #if __LP64__
+ case launch_cache::Image::FixupKind::bind64:
+ #else
+ case launch_cache::Image::FixupKind::bind32:
+ #endif
+ value = targetValue.resolveTarget(diag, imageGroup, imageResolver);
+ log_fixups("dyld: fixup: %s:%p = %p\n", leafName, fixUpLoc, (void*)value);
+ *fixUpLoc = value;
+ break;
+ #if __i386__
+ case launch_cache::Image::FixupKind::rebaseText32:
+ log_fixups("dyld: text fixup: %s:%p += %p\n", leafName, fixUpLoc, (void*)slide);
+ *fixUpLoc += slide;
+ break;
+ case launch_cache::Image::FixupKind::bindText32:
+ value = targetValue.resolveTarget(diag, imageGroup, imageResolver);
+ log_fixups("dyld: text fixup: %s:%p = %p\n", leafName, fixUpLoc, (void*)value);
+ *fixUpLoc = value;
+ break;
+ case launch_cache::Image::FixupKind::bindTextRel32:
+ // CALL instruction uses pc-rel value
+ value = targetValue.resolveTarget(diag, imageGroup, imageResolver);
+ log_fixups("dyld: CALL fixup: %s:%p = %p (pc+0x%08X)\n", leafName, fixUpLoc, (void*)value, (value - (uintptr_t)(fixUpLoc)));
+ *fixUpLoc = (value - (uintptr_t)(fixUpLoc));
+ break;
+ case launch_cache::Image::FixupKind::bindImportJmp32:
+ // JMP instruction in __IMPORT segment uses pc-rel value
+ jumpSlot = (uint8_t*)fixUpLoc;
+ value = targetValue.resolveTarget(diag, imageGroup, imageResolver);
+ rel32 = (value - ((uintptr_t)(fixUpLoc)+5));
+ log_fixups("dyld: JMP fixup: %s:%p = %p (pc+0x%08X)\n", leafName, fixUpLoc, (void*)value, rel32);
+ jumpSlot[0] = 0xE9; // JMP rel32
+ jumpSlot[1] = rel32 & 0xFF;
+ jumpSlot[2] = (rel32 >> 8) & 0xFF;
+ jumpSlot[3] = (rel32 >> 16) & 0xFF;
+ jumpSlot[4] = (rel32 >> 24) & 0xFF;
+ break;
+ #endif
+ default:
+ diag.error("unknown fixup kind %d", kind);
+ }
+ if ( diag.hasError() )
+ stop = true;
+ });
+ #if __i386__
+ if ( textRelocs ) {
+ kern_return_t r = vm_protect(mach_task_self(), (vm_address_t)segContent.address, (vm_size_t)segContent.size, false, protections);
+ if ( r != KERN_SUCCESS ) {
+ diag.error("vm_protect() failed trying to make text segment non-writable, result=%d", r);
+ return;
+ }
+ }
+ #endif
+ });
+}
+
+
+
+class VIS_HIDDEN CurrentLoadImages : public launch_cache::TargetSymbolValue::LoadedImages
+{
+public:
+ CurrentLoadImages(launch_cache::DynArray<ImageInfo>& images, const uint8_t* cacheAddr)
+ : _dyldCacheLoadAddress(cacheAddr), _images(images) { }
+
+ virtual const uint8_t* dyldCacheLoadAddressForImage();
+ virtual const mach_header* loadAddressFromGroupAndIndex(uint32_t groupNum, uint32_t indexInGroup);
+ virtual void forEachImage(void (^handler)(uint32_t anIndex, const launch_cache::binary_format::Image*, const mach_header*, bool& stop));
+ virtual void setAsNeverUnload(uint32_t anIndex) { _images[anIndex].neverUnload = true; }
+private:
+ const uint8_t* _dyldCacheLoadAddress;
+ launch_cache::DynArray<ImageInfo>& _images;
+};
+
+const uint8_t* CurrentLoadImages::dyldCacheLoadAddressForImage()
+{
+ return _dyldCacheLoadAddress;
+}
+
+const mach_header* CurrentLoadImages::loadAddressFromGroupAndIndex(uint32_t groupNum, uint32_t indexInGroup)
+{
+ __block const mach_header* result = nullptr;
+ forEachImage(^(uint32_t anIndex, const launch_cache::binary_format::Image* imageData, const mach_header* mh, bool& stop) {
+ launch_cache::Image image(imageData);
+ launch_cache::ImageGroup imageGroup = image.group();
+ if ( imageGroup.groupNum() != groupNum )
+ return;
+ if ( imageGroup.indexInGroup(imageData) == indexInGroup ) {
+ result = mh;
+ stop = true;
+ }
+ });
+ return result;
+}
+
+void CurrentLoadImages::forEachImage(void (^handler)(uint32_t anIndex, const launch_cache::binary_format::Image*, const mach_header*, bool& stop))
+{
+ bool stop = false;
+ for (int i=0; i < _images.count(); ++i) {
+ ImageInfo& info = _images[i];
+ handler(i, info.imageData, info.loadAddress, stop);
+ if ( stop )
+ break;
+ }
+}
+
+struct DOFInfo {
+ const void* dof;
+ const mach_header* imageHeader;
+ const char* imageShortName;
+};
+
+static void registerDOFs(const DOFInfo* dofs, uint32_t dofSectionCount, LogFunc log_dofs)
+{
+ if ( dofSectionCount != 0 ) {
+ int fd = open("/dev/" DTRACEMNR_HELPER, O_RDWR);
+ if ( fd < 0 ) {
+ log_dofs("can't open /dev/" DTRACEMNR_HELPER " to register dtrace DOF sections\n");
+ }
+ else {
+ // allocate a buffer on the stack for the variable length dof_ioctl_data_t type
+ uint8_t buffer[sizeof(dof_ioctl_data_t) + dofSectionCount*sizeof(dof_helper_t)];
+ dof_ioctl_data_t* ioctlData = (dof_ioctl_data_t*)buffer;
+
+ // fill in buffer with one dof_helper_t per DOF section
+ ioctlData->dofiod_count = dofSectionCount;
+ for (unsigned int i=0; i < dofSectionCount; ++i) {
+ strlcpy(ioctlData->dofiod_helpers[i].dofhp_mod, dofs[i].imageShortName, DTRACE_MODNAMELEN);
+ ioctlData->dofiod_helpers[i].dofhp_dof = (uintptr_t)(dofs[i].dof);
+ ioctlData->dofiod_helpers[i].dofhp_addr = (uintptr_t)(dofs[i].dof);
+ }
+
+ // tell kernel about all DOF sections en mas
+ // pass pointer to ioctlData because ioctl() only copies a fixed size amount of data into kernel
+ user_addr_t val = (user_addr_t)(unsigned long)ioctlData;
+ if ( ioctl(fd, DTRACEHIOC_ADDDOF, &val) != -1 ) {
+ // kernel returns a unique identifier for each section in the dofiod_helpers[].dofhp_dof field.
+ // 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 < dofSectionCount; ++i) {
+ log_dofs("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 {
+ //dyld::log( "dyld: ioctl to register dtrace DOF section failed\n");
+ }
+ close(fd);
+ }
+ }
+}
+
+
+void mapAndFixupImages(Diagnostics& diag, launch_cache::DynArray<ImageInfo>& images, const uint8_t* cacheLoadAddress,
+ LogFunc log_loads, LogFunc log_segments, LogFunc log_fixups, LogFunc log_dofs)
+{
+ // scan array and map images not already loaded
+ for (int i=0; i < images.count(); ++i) {
+ ImageInfo& info = images[i];
+ const dyld3::launch_cache::Image image(info.imageData);
+ if ( info.loadAddress != nullptr ) {
+ // log main executable's segments
+ if ( (info.groupNum == 2) && (info.loadAddress->filetype == MH_EXECUTE) && !info.previouslyFixedUp ) {
+ if ( log_segments("dyld: mapped by kernel %s\n", image.path()) ) {
+ MachOParser parser(info.loadAddress);
+ 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.loadAddress + vmOffset;
+ uint64_t end = start+vmSize-1;
+ if ( (segIndex == 0) && (permissions == 0) ) {
+ start = 0;
+ }
+ log_segments("%14s (%c%c%c) 0x%012llX->0x%012llX \n", parser.segmentName(segIndex),
+ (permissions & PROT_READ) ? 'r' : '.', (permissions & PROT_WRITE) ? 'w' : '.', (permissions & PROT_EXEC) ? 'x' : '.' ,
+ start, end);
+ });
+ }
+ }
+ // skip over ones already loaded
+ continue;
+ }
+ if ( image.isDiskImage() ) {
+ //dyld::log("need to load image[%d] %s\n", i, image.path());
+ info.loadAddress = mapImage(image, diag, log_loads, log_segments);
+ if ( diag.hasError() ) {
+ break; // out of for loop
+ }
+ info.justMapped = true;
+ }
+ else {
+ bool expectedOnDisk = image.group().dylibsExpectedOnDisk();
+ bool overridableDylib = image.overridableDylib();
+ if ( expectedOnDisk || overridableDylib ) {
+ struct stat statBuf;
+ if ( ::stat(image.path(), &statBuf) == 0 ) {
+ if ( expectedOnDisk ) {
+ // macOS case: verify dylib file info matches what it was when cache was built
+ if ( image.fileModTime() != statBuf.st_mtime ) {
+ diag.error("cached dylib mod-time has changed, dylib cache has: 0x%08llX, file has: 0x%08lX, for: %s", image.fileModTime(), (long)statBuf.st_mtime, image.path());
+ break; // out of for loop
+ }
+ if ( image.fileINode() != statBuf.st_ino ) {
+ diag.error("cached dylib inode has changed, dylib cache has: 0x%08llX, file has: 0x%08llX, for: %s", image.fileINode(), statBuf.st_ino, image.path());
+ break; // out of for loop
+ }
+ }
+ else {
+ // iOS internal: dylib override installed
+ diag.error("cached dylib overridden: %s", image.path());
+ break; // out of for loop
+ }
+ }
+ else {
+ if ( expectedOnDisk ) {
+ // macOS case: dylib that existed when cache built no longer exists
+ diag.error("missing cached dylib: %s", image.path());
+ break; // out of for loop
+ }
+ }
+ }
+ info.loadAddress = (mach_header*)(cacheLoadAddress + image.cacheOffset());
+ info.justUsedFromDyldCache = true;
+ if ( log_segments("dyld: Using from dyld cache %s\n", image.path()) ) {
+ MachOParser parser(info.loadAddress);
+ image.forEachCacheSegment(^(uint32_t segIndex, uint64_t vmOffset, uint64_t vmSize, uint8_t permissions, bool &stop) {
+ log_segments("%14s (%c%c%c) 0x%012lX->0x%012lX \n", parser.segmentName(segIndex),
+ (permissions & PROT_READ) ? 'r' : '.', (permissions & PROT_WRITE) ? 'w' : '.', (permissions & PROT_EXEC) ? 'x' : '.' ,
+ (long)cacheLoadAddress+vmOffset, (long)cacheLoadAddress+vmOffset+vmSize-1);
+ });
+ }
+ }
+ }
+ if ( diag.hasError() ) {
+ // back out and unmapped images all loaded so far
+ for (uint32_t j=0; j < images.count(); ++j) {
+ ImageInfo& anInfo = images[j];
+ if ( anInfo.justMapped )
+ unmapImage(anInfo.imageData, anInfo.loadAddress);
+ anInfo.loadAddress = nullptr;
+ }
+ return;
+ }
+
+ // apply fixups
+ CurrentLoadImages fixupHelper(images, cacheLoadAddress);
+ for (int i=0; i < images.count(); ++i) {
+ ImageInfo& info = images[i];
+ // images in shared cache do not need fixups applied
+ launch_cache::Image image(info.imageData);
+ if ( !image.isDiskImage() )
+ continue;
+ // previously loaded images were previously fixed up
+ if ( info.previouslyFixedUp )
+ continue;
+ //dyld::log("apply fixups to mh=%p, path=%s\n", info.loadAddress, Image(info.imageData).path());
+ dyld3::loader::applyFixupsToImage(diag, info.loadAddress, info.imageData, fixupHelper, log_fixups);
+ if ( diag.hasError() )
+ break;
+ }
+
+ // Record dtrace DOFs
+ // if ( /* FIXME! register dofs */ )
+ {
+ __block uint32_t dofCount = 0;
+ for (int i=0; i < images.count(); ++i) {
+ ImageInfo& info = images[i];
+ launch_cache::Image image(info.imageData);
+ // previously loaded images were previously fixed up
+ if ( info.previouslyFixedUp )
+ continue;
+ image.forEachDOF(nullptr, ^(const void* section) {
+ // DOFs cause the image to be never-unload
+ assert(image.neverUnload());
+ ++dofCount;
+ });
+ }
+
+ // struct RegisteredDOF { const mach_header* mh; int registrationID; };
+ DOFInfo dofImages[dofCount];
+ __block DOFInfo* dofImagesBase = dofImages;
+ dofCount = 0;
+ for (int i=0; i < images.count(); ++i) {
+ ImageInfo& info = images[i];
+ launch_cache::Image image(info.imageData);
+ // previously loaded images were previously fixed up
+ if ( info.previouslyFixedUp )
+ continue;
+ image.forEachDOF(info.loadAddress, ^(const void* section) {
+ DOFInfo dofInfo;
+ dofInfo.dof = section;
+ dofInfo.imageHeader = info.loadAddress;
+ dofInfo.imageShortName = image.leafName();
+ dofImagesBase[dofCount++] = dofInfo;
+ });
+ }
+ registerDOFs(dofImages, dofCount, log_dofs);
+ }
+}
+
+#if BUILDING_DYLD
+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 ) {
+ bool stop = false;
+ const char* const eof = &lines[statBuf.st_size];
+ for (const char* s = lines; 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;
+ }
+ 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
+
+
+#endif // DYLD_IN_PROCESS
+
+} // namespace loader
+} // namespace dyld3
+
+
+
+
+