/
dyld.cpp
6173 lines (5602 loc) · 214 KB
/
dyld.cpp
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/* -*- mode: C++; c-basic-offset: 4; tab-width: 4 -*-
*
* Copyright (c) 2004-2013 Apple Inc. All rights reserved.
*
* @APPLE_LICENSE_HEADER_START@
*
* This file contains Original Code and/or Modifications of Original Code
* as defined in and that are subject to the Apple Public Source License
* Version 2.0 (the 'License'). You may not use this file except in
* compliance with the License. Please obtain a copy of the License at
* http://www.opensource.apple.com/apsl/ and read it before using this
* file.
*
* The Original Code and all software distributed under the License are
* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
* Please see the License for the specific language governing rights and
* limitations under the License.
*
* @APPLE_LICENSE_HEADER_END@
*/
#include <stdint.h>
#include <string.h>
#include <unistd.h>
#include <errno.h>
#include <fcntl.h>
#include <dirent.h>
#include <pthread.h>
#include <libproc.h>
#include <sys/param.h>
#include <mach/mach_time.h> // mach_absolute_time()
#include <mach/mach_init.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/syscall.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <sys/syslog.h>
#include <sys/uio.h>
#include <mach-o/fat.h>
#include <mach-o/loader.h>
#include <mach-o/ldsyms.h>
#include <libkern/OSByteOrder.h>
#include <libkern/OSAtomic.h>
#include <mach/mach.h>
#include <sys/sysctl.h>
#include <sys/mman.h>
#include <sys/dtrace.h>
#include <libkern/OSAtomic.h>
#include <Availability.h>
#include <System/sys/codesign.h>
#include <System/sys/csr.h>
#include <_simple.h>
#include <os/lock_private.h>
#include <System/machine/cpu_capabilities.h>
#include <System/sys/reason.h>
#include <kern/kcdata.h>
#include <sandbox.h>
#include <sandbox/private.h>
#include <array>
#ifndef CPU_SUBTYPE_ARM_V5TEJ
#define CPU_SUBTYPE_ARM_V5TEJ ((cpu_subtype_t) 7)
#endif
#ifndef CPU_SUBTYPE_ARM_XSCALE
#define CPU_SUBTYPE_ARM_XSCALE ((cpu_subtype_t) 8)
#endif
#ifndef CPU_SUBTYPE_ARM_V7
#define CPU_SUBTYPE_ARM_V7 ((cpu_subtype_t) 9)
#endif
#ifndef CPU_SUBTYPE_ARM_V7F
#define CPU_SUBTYPE_ARM_V7F ((cpu_subtype_t) 10)
#endif
#ifndef CPU_SUBTYPE_ARM_V7S
#define CPU_SUBTYPE_ARM_V7S ((cpu_subtype_t) 11)
#endif
#ifndef CPU_SUBTYPE_ARM_V7K
#define CPU_SUBTYPE_ARM_V7K ((cpu_subtype_t) 12)
#endif
#ifndef LC_DYLD_ENVIRONMENT
#define LC_DYLD_ENVIRONMENT 0x27
#endif
#ifndef CPU_SUBTYPE_X86_64_H
#define CPU_SUBTYPE_X86_64_H ((cpu_subtype_t) 8)
#endif
#ifndef VM_PROT_SLIDE
#define VM_PROT_SLIDE 0x20
#endif
#include <vector>
#include <algorithm>
#include "mach-o/dyld_gdb.h"
#include "dyld.h"
#include "ImageLoader.h"
#include "ImageLoaderMachO.h"
#include "dyldLibSystemInterface.h"
#if DYLD_SHARED_CACHE_SUPPORT
#include "dyld_cache_format.h"
#endif
#include "dyld_process_info_internal.h"
#include <coreSymbolicationDyldSupport.h>
#if TARGET_IPHONE_SIMULATOR
extern "C" void xcoresymbolication_load_notifier(void *connection, uint64_t load_timestamp, const char *image_path, const struct mach_header *mach_header);
extern "C" void xcoresymbolication_unload_notifier(void *connection, uint64_t unload_timestamp, const char *image_path, const struct mach_header *mach_header);
#define coresymbolication_load_notifier(c, t, p, h) xcoresymbolication_load_notifier(c, t, p, h)
#define coresymbolication_unload_notifier(c, t, p, h) xcoresymbolication_unload_notifier(c, t, p, h)
#endif
#if SUPPORT_ACCELERATE_TABLES
#include "ImageLoaderMegaDylib.h"
#endif
#if TARGET_IPHONE_SIMULATOR
extern "C" void* gSyscallHelpers;
#else
#include "dyldSyscallInterface.h"
#endif
// not libc header for send() syscall interface
extern "C" ssize_t __sendto(int, const void *, size_t, int, const struct sockaddr *, socklen_t);
// ARM and x86_64 are the only architecture that use cpu-sub-types
#define CPU_SUBTYPES_SUPPORTED ((__arm__ || __x86_64__) && !TARGET_IPHONE_SIMULATOR)
#if __LP64__
#define LC_SEGMENT_COMMAND LC_SEGMENT_64
#define LC_SEGMENT_COMMAND_WRONG LC_SEGMENT
#define LC_ENCRYPT_COMMAND LC_ENCRYPTION_INFO
#define macho_segment_command segment_command_64
#define macho_section section_64
#else
#define LC_SEGMENT_COMMAND LC_SEGMENT
#define LC_SEGMENT_COMMAND_WRONG LC_SEGMENT_64
#define LC_ENCRYPT_COMMAND LC_ENCRYPTION_INFO_64
#define macho_segment_command segment_command
#define macho_section section
#endif
#define CPU_TYPE_MASK 0x00FFFFFF /* complement of CPU_ARCH_MASK */
/* implemented in dyld_gdb.cpp */
extern void resetAllImages();
extern void addImagesToAllImages(uint32_t infoCount, const dyld_image_info info[]);
extern void removeImageFromAllImages(const mach_header* mh);
extern void addNonSharedCacheImageUUID(const dyld_uuid_info& info);
extern const char* notifyGDB(enum dyld_image_states state, uint32_t infoCount, const dyld_image_info info[]);
extern size_t allImagesCount();
// magic so CrashReporter logs message
extern "C" {
char error_string[1024];
}
// magic linker symbol for start of dyld binary
extern "C" const macho_header __dso_handle;
//
// The file contains the core of dyld used to get a process to main().
// The API's that dyld supports are implemented in dyldAPIs.cpp.
//
//
//
//
//
namespace dyld {
struct RegisteredDOF { const mach_header* mh; int registrationID; };
struct DylibOverride { const char* installName; const char* override; };
}
VECTOR_NEVER_DESTRUCTED(ImageLoader*);
VECTOR_NEVER_DESTRUCTED(dyld::RegisteredDOF);
VECTOR_NEVER_DESTRUCTED(dyld::ImageCallback);
VECTOR_NEVER_DESTRUCTED(dyld::DylibOverride);
VECTOR_NEVER_DESTRUCTED(ImageLoader::DynamicReference);
VECTOR_NEVER_DESTRUCTED(dyld_image_state_change_handler);
namespace dyld {
//
// state of all environment variables dyld uses
//
struct EnvironmentVariables {
const char* const * DYLD_FRAMEWORK_PATH;
const char* const * DYLD_FALLBACK_FRAMEWORK_PATH;
const char* const * DYLD_LIBRARY_PATH;
const char* const * DYLD_FALLBACK_LIBRARY_PATH;
const char* const * DYLD_INSERT_LIBRARIES;
const char* const * LD_LIBRARY_PATH; // for unix conformance
const char* const * DYLD_VERSIONED_LIBRARY_PATH;
const char* const * DYLD_VERSIONED_FRAMEWORK_PATH;
bool DYLD_PRINT_LIBRARIES_POST_LAUNCH;
bool DYLD_BIND_AT_LAUNCH;
bool DYLD_PRINT_STATISTICS;
bool DYLD_PRINT_STATISTICS_DETAILS;
bool DYLD_PRINT_OPTS;
bool DYLD_PRINT_ENV;
bool DYLD_DISABLE_DOFS;
bool DYLD_PRINT_CS_NOTIFICATIONS;
// DYLD_SHARED_CACHE_DONT_VALIDATE ==> sSharedCacheIgnoreInodeAndTimeStamp
// DYLD_SHARED_CACHE_DIR ==> sSharedCacheDir
// DYLD_ROOT_PATH ==> gLinkContext.rootPaths
// DYLD_IMAGE_SUFFIX ==> gLinkContext.imageSuffix
// DYLD_PRINT_OPTS ==> gLinkContext.verboseOpts
// DYLD_PRINT_ENV ==> gLinkContext.verboseEnv
// DYLD_FORCE_FLAT_NAMESPACE ==> gLinkContext.bindFlat
// DYLD_PRINT_INITIALIZERS ==> gLinkContext.verboseInit
// DYLD_PRINT_SEGMENTS ==> gLinkContext.verboseMapping
// DYLD_PRINT_BINDINGS ==> gLinkContext.verboseBind
// DYLD_PRINT_WEAK_BINDINGS ==> gLinkContext.verboseWeakBind
// DYLD_PRINT_REBASINGS ==> gLinkContext.verboseRebase
// DYLD_PRINT_DOFS ==> gLinkContext.verboseDOF
// DYLD_PRINT_APIS ==> gLogAPIs
// DYLD_IGNORE_PREBINDING ==> gLinkContext.prebindUsage
// DYLD_PREBIND_DEBUG ==> gLinkContext.verbosePrebinding
// DYLD_NEW_LOCAL_SHARED_REGIONS ==> gLinkContext.sharedRegionMode
// DYLD_SHARED_REGION ==> gLinkContext.sharedRegionMode
// DYLD_PRINT_WARNINGS ==> gLinkContext.verboseWarnings
// DYLD_PRINT_RPATHS ==> gLinkContext.verboseRPaths
// DYLD_PRINT_INTERPOSING ==> gLinkContext.verboseInterposing
// DYLD_PRINT_LIBRARIES ==> gLinkContext.verboseLoading
};
typedef std::vector<dyld_image_state_change_handler> StateHandlers;
enum EnvVarMode { envNone, envPrintOnly, envAll };
// all global state
static const char* sExecPath = NULL;
static const char* sExecShortName = NULL;
static const macho_header* sMainExecutableMachHeader = NULL;
#if CPU_SUBTYPES_SUPPORTED
static cpu_type_t sHostCPU;
static cpu_subtype_t sHostCPUsubtype;
#endif
static ImageLoaderMachO* sMainExecutable = NULL;
static EnvVarMode sEnvMode = envNone;
static size_t sInsertedDylibCount = 0;
static std::vector<ImageLoader*> sAllImages;
static std::vector<ImageLoader*> sImageRoots;
static std::vector<ImageLoader*> sImageFilesNeedingTermination;
static std::vector<RegisteredDOF> sImageFilesNeedingDOFUnregistration;
static std::vector<ImageCallback> sAddImageCallbacks;
static std::vector<ImageCallback> sRemoveImageCallbacks;
static bool sRemoveImageCallbacksInUse = false;
static void* sSingleHandlers[7][3];
static void* sBatchHandlers[7][3];
static ImageLoader* sLastImageByAddressCache;
static EnvironmentVariables sEnv;
#if __MAC_OS_X_VERSION_MIN_REQUIRED
static const char* sFrameworkFallbackPaths[] = { "$HOME/Library/Frameworks", "/Library/Frameworks", "/Network/Library/Frameworks", "/System/Library/Frameworks", NULL };
static const char* sLibraryFallbackPaths[] = { "$HOME/lib", "/usr/local/lib", "/usr/lib", NULL };
#else
static const char* sFrameworkFallbackPaths[] = { "/System/Library/Frameworks", NULL };
static const char* sLibraryFallbackPaths[] = { "/usr/local/lib", "/usr/lib", NULL };
#endif
static const char* sRestrictedFrameworkFallbackPaths[] = { "/System/Library/Frameworks", NULL };
static const char* sRestrictedLibraryFallbackPaths[] = { "/usr/lib", NULL };
static UndefinedHandler sUndefinedHandler = NULL;
static ImageLoader* sBundleBeingLoaded = NULL; // hack until OFI is reworked
#if DYLD_SHARED_CACHE_SUPPORT
static const dyld_cache_header* sSharedCache = NULL;
static long sSharedCacheSlide = 0;
static bool sSharedCacheIgnoreInodeAndTimeStamp = false;
bool gSharedCacheOverridden = false;
#if __IPHONE_OS_VERSION_MIN_REQUIRED
static const char* sSharedCacheDir = IPHONE_DYLD_SHARED_CACHE_DIR;
#define ENABLE_DYLIBS_TO_OVERRIDE_CACHE_SIZE 1024
#else
static const char* sSharedCacheDir = MACOSX_DYLD_SHARED_CACHE_DIR;
#endif
#endif
ImageLoader::LinkContext gLinkContext;
bool gLogAPIs = false;
#if SUPPORT_ACCELERATE_TABLES
bool gLogAppAPIs = false;
#endif
const struct LibSystemHelpers* gLibSystemHelpers = NULL;
#if SUPPORT_OLD_CRT_INITIALIZATION
bool gRunInitializersOldWay = false;
#endif
static std::vector<DylibOverride> sDylibOverrides;
#if !TARGET_IPHONE_SIMULATOR
static int sLogSocket = -1;
#endif
static bool sFrameworksFoundAsDylibs = false;
#if __x86_64__ && DYLD_SHARED_CACHE_SUPPORT
static bool sHaswell = false;
#endif
static std::vector<ImageLoader::DynamicReference> sDynamicReferences;
static OSSpinLock sDynamicReferencesLock = 0;
#if !TARGET_IPHONE_SIMULATOR
static bool sLogToFile = false;
#endif
static char sLoadingCrashMessage[1024] = "dyld: launch, loading dependent libraries";
static bool sSafeMode = false;
static _dyld_objc_notify_mapped sNotifyObjCMapped;
static _dyld_objc_notify_init sNotifyObjCInit;
static _dyld_objc_notify_unmapped sNotifyObjCUnmapped;
#if __IPHONE_OS_VERSION_MIN_REQUIRED && !TARGET_IPHONE_SIMULATOR
static bool sForceStderr = false;
#endif
#if SUPPORT_ACCELERATE_TABLES
static ImageLoaderMegaDylib* sAllCacheImagesProxy = NULL;
static bool sDisableAcceleratorTables = false;
#endif
//
// The MappedRanges structure is used for fast address->image lookups.
// The table is only updated when the dyld lock is held, so we don't
// need to worry about multiple writers. But readers may look at this
// data without holding the lock. Therefore, all updates must be done
// in an order that will never cause readers to see inconsistent data.
// The general rule is that if the image field is non-NULL then
// the other fields are valid.
//
struct MappedRanges
{
MappedRanges* next;
unsigned long count;
struct {
ImageLoader* image;
uintptr_t start;
uintptr_t end;
} array[1];
};
static MappedRanges* sMappedRangesStart;
void addMappedRange(ImageLoader* image, uintptr_t start, uintptr_t end)
{
//dyld::log("addMappedRange(0x%lX->0x%lX) for %s\n", start, end, image->getShortName());
for (MappedRanges* p = sMappedRangesStart; p != NULL; p = p->next) {
for (unsigned long i=0; i < p->count; ++i) {
if ( p->array[i].image == NULL ) {
p->array[i].start = start;
p->array[i].end = end;
// add image field last with a barrier so that any reader will see consistent records
OSMemoryBarrier();
p->array[i].image = image;
return;
}
}
}
// table must be full, chain another
#if SUPPORT_ACCELERATE_TABLES
unsigned count = (sAllCacheImagesProxy != NULL) ? 16 : 400;
#else
unsigned count = 400;
#endif
size_t allocationSize = sizeof(MappedRanges) + (count-1)*3*sizeof(void*);
MappedRanges* newRanges = (MappedRanges*)malloc(allocationSize);
bzero(newRanges, allocationSize);
newRanges->count = count;
newRanges->array[0].start = start;
newRanges->array[0].end = end;
newRanges->array[0].image = image;
OSMemoryBarrier();
if ( sMappedRangesStart == NULL ) {
sMappedRangesStart = newRanges;
}
else {
for (MappedRanges* p = sMappedRangesStart; p != NULL; p = p->next) {
if ( p->next == NULL ) {
OSMemoryBarrier();
p->next = newRanges;
break;
}
}
}
}
void removedMappedRanges(ImageLoader* image)
{
for (MappedRanges* p = sMappedRangesStart; p != NULL; p = p->next) {
for (unsigned long i=0; i < p->count; ++i) {
if ( p->array[i].image == image ) {
// clear with a barrier so that any reader will see consistent records
OSMemoryBarrier();
p->array[i].image = NULL;
}
}
}
}
ImageLoader* findMappedRange(uintptr_t target)
{
for (MappedRanges* p = sMappedRangesStart; p != NULL; p = p->next) {
for (unsigned long i=0; i < p->count; ++i) {
if ( p->array[i].image != NULL ) {
if ( (p->array[i].start <= target) && (target < p->array[i].end) )
return p->array[i].image;
}
}
}
return NULL;
}
const char* mkstringf(const char* format, ...)
{
_SIMPLE_STRING buf = _simple_salloc();
if ( buf != NULL ) {
va_list list;
va_start(list, format);
_simple_vsprintf(buf, format, list);
va_end(list);
const char* t = strdup(_simple_string(buf));
_simple_sfree(buf);
if ( t != NULL )
return t;
}
return "mkstringf, out of memory error";
}
void throwf(const char* format, ...)
{
_SIMPLE_STRING buf = _simple_salloc();
if ( buf != NULL ) {
va_list list;
va_start(list, format);
_simple_vsprintf(buf, format, list);
va_end(list);
const char* t = strdup(_simple_string(buf));
_simple_sfree(buf);
if ( t != NULL )
throw t;
}
throw "throwf, out of memory error";
}
#if !TARGET_IPHONE_SIMULATOR
static int sLogfile = STDERR_FILENO;
#endif
#if !TARGET_IPHONE_SIMULATOR
// based on CFUtilities.c: also_do_stderr()
static bool useSyslog()
{
// Use syslog() for processes managed by launchd
static bool launchdChecked = false;
static bool launchdOwned = false;
if ( !launchdChecked && gProcessInfo->libSystemInitialized ) {
if ( (gLibSystemHelpers != NULL) && (gLibSystemHelpers->version >= 11) ) {
// <rdar://problem/23520449> only call isLaunchdOwned() after libSystem is initialized
launchdOwned = (*gLibSystemHelpers->isLaunchdOwned)();
launchdChecked = true;
}
}
if ( launchdChecked && launchdOwned )
return true;
// If stderr is not available, use syslog()
struct stat sb;
int result = fstat(STDERR_FILENO, &sb);
if ( result < 0 )
return true; // file descriptor 2 is closed
return false;
}
static void socket_syslogv(int priority, const char* format, va_list list)
{
// lazily create socket and connection to syslogd
if ( sLogSocket == -1 ) {
sLogSocket = ::socket(AF_UNIX, SOCK_DGRAM, 0);
if (sLogSocket == -1)
return; // cannot log
::fcntl(sLogSocket, F_SETFD, 1);
struct sockaddr_un addr;
addr.sun_family = AF_UNIX;
strncpy(addr.sun_path, _PATH_LOG, sizeof(addr.sun_path));
if ( ::connect(sLogSocket, (struct sockaddr *)&addr, sizeof(addr)) == -1 ) {
::close(sLogSocket);
sLogSocket = -1;
return;
}
}
// format message to syslogd like: "<priority>Process[pid]: message"
_SIMPLE_STRING buf = _simple_salloc();
if ( buf == NULL )
return;
if ( _simple_sprintf(buf, "<%d>%s[%d]: ", LOG_USER|LOG_NOTICE, sExecShortName, getpid()) == 0 ) {
if ( _simple_vsprintf(buf, format, list) == 0 ) {
const char* p = _simple_string(buf);
::__sendto(sLogSocket, p, strlen(p), 0, NULL, 0);
}
}
_simple_sfree(buf);
}
void vlog(const char* format, va_list list)
{
#if __IPHONE_OS_VERSION_MIN_REQUIRED && !TARGET_IPHONE_SIMULATOR
// <rdar://problem/25965832> log to console when running iOS app from Xcode
if ( !sLogToFile && !sForceStderr && useSyslog() )
#else
if ( !sLogToFile && useSyslog() )
#endif
socket_syslogv(LOG_ERR, format, list);
else {
_simple_vdprintf(sLogfile, format, list);
}
}
void log(const char* format, ...)
{
va_list list;
va_start(list, format);
vlog(format, list);
va_end(list);
}
void vwarn(const char* format, va_list list)
{
_simple_dprintf(sLogfile, "dyld: warning, ");
_simple_vdprintf(sLogfile, format, list);
}
void warn(const char* format, ...)
{
va_list list;
va_start(list, format);
vwarn(format, list);
va_end(list);
}
#endif // !TARGET_IPHONE_SIMULATOR
// <rdar://problem/8867781> control access to sAllImages through a lock
// because global dyld lock is not held during initialization phase of dlopen()
// <rdar://problem/16145518> Use OSSpinLockLock to allow yielding
static OSSpinLock sAllImagesLock = 0;
static void allImagesLock()
{
OSSpinLockLock(&sAllImagesLock);
}
static void allImagesUnlock()
{
OSSpinLockUnlock(&sAllImagesLock);
}
// utility class to assure files are closed when an exception is thrown
class FileOpener {
public:
FileOpener(const char* path);
~FileOpener();
int getFileDescriptor() { return fd; }
private:
int fd;
};
FileOpener::FileOpener(const char* path)
: fd(-1)
{
fd = my_open(path, O_RDONLY, 0);
}
FileOpener::~FileOpener()
{
if ( fd != -1 )
close(fd);
}
static void registerDOFs(const std::vector<ImageLoader::DOFInfo>& dofs)
{
const size_t dofSectionCount = dofs.size();
if ( !sEnv.DYLD_DISABLE_DOFS && (dofSectionCount != 0) ) {
int fd = open("/dev/" DTRACEMNR_HELPER, O_RDWR);
if ( fd < 0 ) {
//dyld::warn("can't open /dev/" DTRACEMNR_HELPER " to register dtrace DOF sections\n");
}
else {
// allocate a buffer on the stack for the variable length dof_ioctl_data_t type
uint8_t buffer[sizeof(dof_ioctl_data_t) + dofSectionCount*sizeof(dof_helper_t)];
dof_ioctl_data_t* ioctlData = (dof_ioctl_data_t*)buffer;
// fill in buffer with one dof_helper_t per DOF section
ioctlData->dofiod_count = dofSectionCount;
for (unsigned int i=0; i < dofSectionCount; ++i) {
strlcpy(ioctlData->dofiod_helpers[i].dofhp_mod, dofs[i].imageShortName, DTRACE_MODNAMELEN);
ioctlData->dofiod_helpers[i].dofhp_dof = (uintptr_t)(dofs[i].dof);
ioctlData->dofiod_helpers[i].dofhp_addr = (uintptr_t)(dofs[i].dof);
}
// tell kernel about all DOF sections en mas
// pass pointer to ioctlData because ioctl() only copies a fixed size amount of data into kernel
user_addr_t val = (user_addr_t)(unsigned long)ioctlData;
if ( ioctl(fd, DTRACEHIOC_ADDDOF, &val) != -1 ) {
// kernel returns a unique identifier for each section in the dofiod_helpers[].dofhp_dof field.
for (unsigned int i=0; i < dofSectionCount; ++i) {
RegisteredDOF info;
info.mh = dofs[i].imageHeader;
info.registrationID = (int)(ioctlData->dofiod_helpers[i].dofhp_dof);
sImageFilesNeedingDOFUnregistration.push_back(info);
if ( gLinkContext.verboseDOF ) {
dyld::log("dyld: registering DOF section %p in %s with dtrace, ID=0x%08X\n",
dofs[i].dof, dofs[i].imageShortName, info.registrationID);
}
}
}
else {
//dyld::log( "dyld: ioctl to register dtrace DOF section failed\n");
}
close(fd);
}
}
}
static void unregisterDOF(int registrationID)
{
int fd = open("/dev/" DTRACEMNR_HELPER, O_RDWR);
if ( fd < 0 ) {
dyld::warn("can't open /dev/" DTRACEMNR_HELPER " to unregister dtrace DOF section\n");
}
else {
ioctl(fd, DTRACEHIOC_REMOVE, registrationID);
close(fd);
if ( gLinkContext.verboseInit )
dyld::warn("unregistering DOF section ID=0x%08X with dtrace\n", registrationID);
}
}
//
// _dyld_register_func_for_add_image() is implemented as part of the general image state change notification
//
static void notifyAddImageCallbacks(ImageLoader* image)
{
// use guard so that we cannot notify about the same image twice
if ( ! image->addFuncNotified() ) {
for (std::vector<ImageCallback>::iterator it=sAddImageCallbacks.begin(); it != sAddImageCallbacks.end(); it++)
(*it)(image->machHeader(), image->getSlide());
image->setAddFuncNotified();
}
}
// notify gdb about these new images
static const char* updateAllImages(enum dyld_image_states state, uint32_t infoCount, const struct dyld_image_info info[])
{
// <rdar://problem/8812589> don't add images without paths to all-image-info-list
if ( info[0].imageFilePath != NULL )
addImagesToAllImages(infoCount, info);
return NULL;
}
static StateHandlers* stateToHandlers(dyld_image_states state, void* handlersArray[7][3])
{
switch ( state ) {
case dyld_image_state_mapped:
return reinterpret_cast<StateHandlers*>(&handlersArray[0]);
case dyld_image_state_dependents_mapped:
return reinterpret_cast<StateHandlers*>(&handlersArray[1]);
case dyld_image_state_rebased:
return reinterpret_cast<StateHandlers*>(&handlersArray[2]);
case dyld_image_state_bound:
return reinterpret_cast<StateHandlers*>(&handlersArray[3]);
case dyld_image_state_dependents_initialized:
return reinterpret_cast<StateHandlers*>(&handlersArray[4]);
case dyld_image_state_initialized:
return reinterpret_cast<StateHandlers*>(&handlersArray[5]);
case dyld_image_state_terminated:
return reinterpret_cast<StateHandlers*>(&handlersArray[6]);
}
return NULL;
}
#if SUPPORT_ACCELERATE_TABLES
static dyld_image_state_change_handler getPreInitNotifyHandler(unsigned index)
{
std::vector<dyld_image_state_change_handler>* handlers = stateToHandlers(dyld_image_state_dependents_initialized, sSingleHandlers);
if ( index >= handlers->size() )
return NULL;
return (*handlers)[index];
}
static dyld_image_state_change_handler getBoundBatchHandler(unsigned index)
{
std::vector<dyld_image_state_change_handler>* handlers = stateToHandlers(dyld_image_state_bound, sBatchHandlers);
if ( index >= handlers->size() )
return NULL;
return (*handlers)[index];
}
static void notifySingleFromCache(dyld_image_states state, const mach_header* mh, const char* path)
{
//dyld::log("notifySingle(state=%d, image=%s)\n", state, image->getPath());
std::vector<dyld_image_state_change_handler>* handlers = stateToHandlers(state, sSingleHandlers);
if ( handlers != NULL ) {
dyld_image_info info;
info.imageLoadAddress = mh;
info.imageFilePath = path;
info.imageFileModDate = 0;
for (dyld_image_state_change_handler handler : *handlers) {
const char* result = (*handler)(state, 1, &info);
if ( (result != NULL) && (state == dyld_image_state_mapped) ) {
//fprintf(stderr, " image rejected by handler=%p\n", *it);
// make copy of thrown string so that later catch clauses can free it
const char* str = strdup(result);
throw str;
}
}
}
if ( (state == dyld_image_state_dependents_initialized) && (sNotifyObjCInit != NULL) && (mh->flags & MH_HAS_OBJC) ) {
(*sNotifyObjCInit)(path, mh);
}
}
#endif
static mach_port_t sNotifyReplyPorts[DYLD_MAX_PROCESS_INFO_NOTIFY_COUNT];
static void notifyMonitoringDyld(bool unloading, unsigned portSlot, unsigned imageCount, const dyld_image_info infos[])
{
unsigned entriesSize = imageCount*sizeof(dyld_process_info_image_entry);
unsigned pathsSize = 0;
for (unsigned j=0; j < imageCount; ++j) {
pathsSize += (strlen(infos[j].imageFilePath) + 1);
}
unsigned totalSize = (sizeof(dyld_process_info_notify_header) + entriesSize + pathsSize + 127) & -128; // align
if ( totalSize > DYLD_PROCESS_INFO_NOTIFY_MAX_BUFFER_SIZE ) {
// Putting all image paths into one message would make buffer too big.
// Instead split into two messages. Recurse as needed until paths fit in buffer.
unsigned imageHalfCount = imageCount/2;
notifyMonitoringDyld(unloading, portSlot, imageHalfCount, infos);
notifyMonitoringDyld(unloading, portSlot, imageCount - imageHalfCount, &infos[imageHalfCount]);
return;
}
uint8_t buffer[totalSize];
dyld_process_info_notify_header* header = (dyld_process_info_notify_header*)buffer;
header->version = 1;
header->imageCount = imageCount;
header->imagesOffset = sizeof(dyld_process_info_notify_header);
header->stringsOffset = sizeof(dyld_process_info_notify_header) + entriesSize;
header->timestamp = dyld::gProcessInfo->infoArrayChangeTimestamp;
dyld_process_info_image_entry* entries = (dyld_process_info_image_entry*)&buffer[header->imagesOffset];
char* const pathPoolStart = (char*)&buffer[header->stringsOffset];
char* pathPool = pathPoolStart;
for (unsigned j=0; j < imageCount; ++j) {
strcpy(pathPool, infos[j].imageFilePath);
uint32_t len = (uint32_t)strlen(pathPool);
bzero(entries->uuid, 16);
const ImageLoader* image = findImageByMachHeader(infos[j].imageLoadAddress);
if ( image != NULL ) {
image->getUUID(entries->uuid);
}
#if SUPPORT_ACCELERATE_TABLES
else if ( sAllCacheImagesProxy != NULL ) {
const mach_header* mh;
const char* path;
unsigned index;
if ( sAllCacheImagesProxy->addressInCache(infos[j].imageLoadAddress, &mh, &path, &index) ) {
sAllCacheImagesProxy->getDylibUUID(index, entries->uuid);
}
}
#endif
entries->loadAddress = (uint64_t)infos[j].imageLoadAddress;
entries->pathStringOffset = (uint32_t)(pathPool - pathPoolStart);
entries->pathLength = len;
pathPool += (len +1);
++entries;
}
if ( sNotifyReplyPorts[portSlot] == 0 ) {
if ( !mach_port_allocate(mach_task_self(), MACH_PORT_RIGHT_RECEIVE, &sNotifyReplyPorts[portSlot]) )
mach_port_insert_right(mach_task_self(), sNotifyReplyPorts[portSlot], sNotifyReplyPorts[portSlot], MACH_MSG_TYPE_MAKE_SEND);
//dyld::log("allocated reply port %d\n", sNotifyReplyPorts[portSlot]);
}
//dyld::log("found port to send to\n");
mach_msg_header_t* h = (mach_msg_header_t*)buffer;
h->msgh_bits = MACH_MSGH_BITS(MACH_MSG_TYPE_COPY_SEND,MACH_MSG_TYPE_MAKE_SEND); // MACH_MSG_TYPE_MAKE_SEND_ONCE
h->msgh_id = unloading ? DYLD_PROCESS_INFO_NOTIFY_UNLOAD_ID : DYLD_PROCESS_INFO_NOTIFY_LOAD_ID;
h->msgh_local_port = sNotifyReplyPorts[portSlot];
h->msgh_remote_port = dyld::gProcessInfo->notifyPorts[portSlot];
h->msgh_reserved = 0;
h->msgh_size = (mach_msg_size_t)sizeof(buffer);
//dyld::log("sending to port[%d]=%d, size=%d, reply port=%d, id=0x%X\n", portSlot, dyld::gProcessInfo->notifyPorts[portSlot], h->msgh_size, sNotifyReplyPorts[portSlot], h->msgh_id);
kern_return_t sendResult = mach_msg(h, MACH_SEND_MSG | MACH_RCV_MSG | MACH_SEND_TIMEOUT, h->msgh_size, h->msgh_size, sNotifyReplyPorts[portSlot], 100, MACH_PORT_NULL);
//dyld::log("send result = 0x%X, msg_id=%d, msg_size=%d\n", sendResult, h->msgh_id, h->msgh_size);
if ( sendResult == MACH_SEND_INVALID_DEST ) {
// sender is not responding, detatch
//dyld::log("process requesting notification gone. deallocation send port %d and receive port %d\n", dyld::gProcessInfo->notifyPorts[portSlot], sNotifyReplyPorts[portSlot]);
mach_port_deallocate(mach_task_self(), dyld::gProcessInfo->notifyPorts[portSlot]);
mach_port_deallocate(mach_task_self(), sNotifyReplyPorts[portSlot]);
dyld::gProcessInfo->notifyPorts[portSlot] = 0;
sNotifyReplyPorts[portSlot] = 0;
}
}
static void notifyMonitoringDyldMain()
{
for (int slot=0; slot < DYLD_MAX_PROCESS_INFO_NOTIFY_COUNT; ++slot) {
if ( dyld::gProcessInfo->notifyPorts[slot] != 0 ) {
if ( sNotifyReplyPorts[slot] == 0 ) {
if ( !mach_port_allocate(mach_task_self(), MACH_PORT_RIGHT_RECEIVE, &sNotifyReplyPorts[slot]) )
mach_port_insert_right(mach_task_self(), sNotifyReplyPorts[slot], sNotifyReplyPorts[slot], MACH_MSG_TYPE_MAKE_SEND);
//dyld::log("allocated reply port %d\n", sNotifyReplyPorts[slot]);
}
//dyld::log("found port to send to\n");
mach_msg_header_t h;
h.msgh_bits = MACH_MSGH_BITS(MACH_MSG_TYPE_COPY_SEND,MACH_MSG_TYPE_MAKE_SEND); // MACH_MSG_TYPE_MAKE_SEND_ONCE
h.msgh_id = DYLD_PROCESS_INFO_NOTIFY_MAIN_ID;
h.msgh_local_port = sNotifyReplyPorts[slot];
h.msgh_remote_port = dyld::gProcessInfo->notifyPorts[slot];
h.msgh_reserved = 0;
h.msgh_size = (mach_msg_size_t)sizeof(mach_msg_header_t);
//dyld::log("sending to port[%d]=%d, size=%d, reply port=%d, id=0x%X\n", slot, dyld::gProcessInfo->notifyPorts[slot], h.msgh_size, sNotifyReplyPorts[slot], h.msgh_id);
kern_return_t sendResult = mach_msg(&h, MACH_SEND_MSG | MACH_RCV_MSG | MACH_SEND_TIMEOUT, h.msgh_size, h.msgh_size, sNotifyReplyPorts[slot], 100, MACH_PORT_NULL);
//dyld::log("send result = 0x%X, msg_id=%d, msg_size=%d\n", sendResult, h.msgh_id, h.msgh_size);
if ( sendResult == MACH_SEND_INVALID_DEST ) {
// sender is not responding, detatch
//dyld::log("process requesting notification gone. deallocation send port %d and receive port %d\n", dyld::gProcessInfo->notifyPorts[slot], sNotifyReplyPorts[slot]);
mach_port_deallocate(mach_task_self(), dyld::gProcessInfo->notifyPorts[slot]);
mach_port_deallocate(mach_task_self(), sNotifyReplyPorts[slot]);
dyld::gProcessInfo->notifyPorts[slot] = 0;
sNotifyReplyPorts[slot] = 0;
}
}
}
}
#define MAX_KERNEL_IMAGES_PER_CALL (100)
static void flushKernelNotifications(bool loading, bool force, std::array<dyld_kernel_image_info_t,MAX_KERNEL_IMAGES_PER_CALL>& kernelInfos, uint32_t &kernelInfoCount) {
if ((force && kernelInfoCount != 0) || kernelInfoCount == MAX_KERNEL_IMAGES_PER_CALL) {
if (loading) {
task_register_dyld_image_infos(mach_task_self(), kernelInfos.data(), kernelInfoCount);
} else {
task_unregister_dyld_image_infos(mach_task_self(), kernelInfos.data(), kernelInfoCount);
}
kernelInfoCount = 0;
}
}
static
void queueKernelNotification(const ImageLoader& image, bool loading, std::array<dyld_kernel_image_info_t,MAX_KERNEL_IMAGES_PER_CALL>& kernelInfos, uint32_t &kernelInfoCount) {
if ( !image.inSharedCache() ) {
ino_t inode = image.getInode();
image.getUUID(kernelInfos[kernelInfoCount].uuid);
memcpy(&kernelInfos[kernelInfoCount].fsobjid, &inode, 8);
kernelInfos[kernelInfoCount].load_addr = (uint64_t)image.machHeader();
// FIXME we should also be grabbing the device ID, but that is not necessary yet,
// and requires threading it through the ImageLoader
kernelInfos[kernelInfoCount].fsid.val[0] = 0;
kernelInfos[kernelInfoCount].fsid.val[1] = 0;
kernelInfoCount++;
}
flushKernelNotifications(loading, false, kernelInfos, kernelInfoCount);
}
void notifyKernel(const ImageLoader& image, bool loading) {
std::array<dyld_kernel_image_info_t,MAX_KERNEL_IMAGES_PER_CALL> kernelInfos;
uint32_t kernelInfoCount = 0;
queueKernelNotification(image, loading, kernelInfos, kernelInfoCount);
flushKernelNotifications(loading, true, kernelInfos, kernelInfoCount);
}
static void notifySingle(dyld_image_states state, const ImageLoader* image, ImageLoader::InitializerTimingList* timingInfo)
{
//dyld::log("notifySingle(state=%d, image=%s)\n", state, image->getPath());
std::vector<dyld_image_state_change_handler>* handlers = stateToHandlers(state, sSingleHandlers);
if ( handlers != NULL ) {
dyld_image_info info;
info.imageLoadAddress = image->machHeader();
info.imageFilePath = image->getRealPath();
info.imageFileModDate = image->lastModified();
for (std::vector<dyld_image_state_change_handler>::iterator it = handlers->begin(); it != handlers->end(); ++it) {
const char* result = (*it)(state, 1, &info);
if ( (result != NULL) && (state == dyld_image_state_mapped) ) {
//fprintf(stderr, " image rejected by handler=%p\n", *it);
// make copy of thrown string so that later catch clauses can free it
const char* str = strdup(result);
throw str;
}
}
}
if ( state == dyld_image_state_mapped ) {
// <rdar://problem/7008875> Save load addr + UUID for images from outside the shared cache
if ( !image->inSharedCache() ) {
dyld_uuid_info info;
if ( image->getUUID(info.imageUUID) ) {
info.imageLoadAddress = image->machHeader();
addNonSharedCacheImageUUID(info);
}
}
}
if ( (state == dyld_image_state_dependents_initialized) && (sNotifyObjCInit != NULL) && image->notifyObjC() ) {
uint64_t t0 = mach_absolute_time();
(*sNotifyObjCInit)(image->getRealPath(), image->machHeader());
uint64_t t1 = mach_absolute_time();
uint64_t t2 = mach_absolute_time();
uint64_t timeInObjC = t1-t0;
uint64_t emptyTime = (t2-t1)*100;
if ( (timeInObjC > emptyTime) && (timingInfo != NULL) ) {
timingInfo->addTime(image->getShortName(), timeInObjC);
}
}
// mach message csdlc about dynamically unloaded images
if ( image->addFuncNotified() && (state == dyld_image_state_terminated) ) {
notifyKernel(*image, false);
uint64_t loadTimestamp = mach_absolute_time();
if ( sEnv.DYLD_PRINT_CS_NOTIFICATIONS ) {
dyld::log("dyld: coresymbolication_unload_notifier(%p, 0x%016llX, %p, %s)\n",
dyld::gProcessInfo->coreSymbolicationShmPage, loadTimestamp, image->machHeader(), image->getPath());
}
if ( dyld::gProcessInfo->coreSymbolicationShmPage != NULL) {
coresymbolication_unload_notifier(dyld::gProcessInfo->coreSymbolicationShmPage, loadTimestamp, image->getPath(), image->machHeader());
}
for (int slot=0; slot < DYLD_MAX_PROCESS_INFO_NOTIFY_COUNT; ++slot) {
if ( dyld::gProcessInfo->notifyPorts[slot] != 0 ) {
dyld_image_info info;
info.imageLoadAddress = image->machHeader();
info.imageFilePath = image->getPath();
info.imageFileModDate = 0;
notifyMonitoringDyld(true, slot, 1, &info);
}
else if ( sNotifyReplyPorts[slot] != 0 ) {
// monitoring process detached from this process, so release reply port
//dyld::log("deallocated reply port %d\n", sNotifyReplyPorts[slot]);
mach_port_deallocate(mach_task_self(), sNotifyReplyPorts[slot]);
sNotifyReplyPorts[slot] = 0;
}
}
}
}
//
// Normally, dyld_all_image_infos is only updated in batches after an entire
// graph is loaded. But if there is an error loading the initial set of
// dylibs needed by the main executable, dyld_all_image_infos is not yet set
// up, leading to usually brief crash logs.
//
// This function manually adds the images loaded so far to dyld::gProcessInfo.
// It should only be called before terminating.
//
void syncAllImages()
{
for (std::vector<ImageLoader*>::iterator it=sAllImages.begin(); it != sAllImages.end(); ++it) {
dyld_image_info info;
ImageLoader* image = *it;
info.imageLoadAddress = image->machHeader();
info.imageFilePath = image->getRealPath();
info.imageFileModDate = image->lastModified();
// add to all_image_infos if not already there
bool found = false;
int existingCount = dyld::gProcessInfo->infoArrayCount;
const dyld_image_info* existing = dyld::gProcessInfo->infoArray;
if ( existing != NULL ) {
for (int i=0; i < existingCount; ++i) {
if ( existing[i].imageLoadAddress == info.imageLoadAddress ) {