dyld_process_info_notify.cpp [plain text]
#include <stdlib.h>
#include <string.h>
#include <limits.h>
#include <stdio.h>
#include <mach/shared_region.h>
#include <mach/mach_vm.h>
#include <libkern/OSAtomic.h>
#include <execinfo.h>
#include <mach-o/dyld_priv.h>
#include <mach-o/dyld_process_info.h>
#include <mach-o/dyld_images.h>
#include <Block.h>
#include <dlfcn.h>
#include "dyld_process_info_internal.h"
#include "Loading.h"
#include "Tracing.h"
#include "AllImages.h"
extern "C" int _dyld_func_lookup(const char* name, void** address);
typedef void (^Notify)(bool unload, uint64_t timestamp, uint64_t machHeader, const uuid_t uuid, const char* path);
typedef void (^NotifyExit)();
typedef void (^NotifyMain)();
struct __attribute__((visibility("hidden"))) dyld_process_info_notify_base
{
dyld_process_info_notify_base(dispatch_queue_t queue, Notify notify, NotifyExit notifyExit, task_t task, kern_return_t* kr);
~dyld_process_info_notify_base();
bool enabled() const;
void retain();
void release();
void setNotifyMain(NotifyMain notifyMain) const {
if (_notifyMain == notifyMain) { return; }
Block_release(_notifyMain);
_notifyMain = Block_copy(notifyMain);
}
static void* operator new(size_t sz) { return malloc(sz); }
static void operator delete(void* p) { free(p); }
private:
void handleEvent();
void disconnect();
void teardownMachPorts();
void replyToMonitoredProcess(mach_msg_header_t& header);
kern_return_t task_dyld_process_info_notify_register(task_read_t target_task, mach_port_t notify);
kern_return_t task_dyld_process_info_notify_deregister(task_read_t target_task, mach_port_t notify);
RemoteBuffer _remoteAllImageInfoBuffer;
mutable std::atomic<uint32_t> _retainCount;
dispatch_queue_t _queue;
mutable Notify _notify;
mutable NotifyExit _notifyExit;
mutable NotifyMain _notifyMain;
dispatch_source_t _machSource;
task_t _task;
mach_port_t _port; std::atomic<bool> _connected;
#if TARGET_OS_SIMULATOR
uint32_t _portInTarget;
#endif
};
#if TARGET_OS_SIMULATOR
template<typename F>
kern_return_t withRemotePortArray(task_t target_task, F f) {
task_dyld_info_data_t taskDyldInfo;
mach_msg_type_number_t taskDyldInfoCount = TASK_DYLD_INFO_COUNT;
auto kr = task_info(target_task, TASK_DYLD_INFO, (task_info_t)&taskDyldInfo, &taskDyldInfoCount);
if (kr != KERN_SUCCESS) {
return kr;
}
vm_prot_t cur_protection = VM_PROT_NONE;
vm_prot_t max_protection = VM_PROT_NONE;
mach_vm_address_t localAddress = 0;
mach_vm_size_t size = sizeof(dyld_all_image_infos_64);
if ( taskDyldInfo.all_image_info_format == TASK_DYLD_ALL_IMAGE_INFO_32 ) {
size = sizeof(dyld_all_image_infos_32);
}
kr = mach_vm_remap(mach_task_self(),
&localAddress,
size,
0, VM_FLAGS_ANYWHERE | VM_FLAGS_RETURN_DATA_ADDR| VM_FLAGS_RESILIENT_CODESIGN | VM_FLAGS_RESILIENT_MEDIA,
target_task,
taskDyldInfo.all_image_info_addr,
false,
&cur_protection,
&max_protection,
VM_INHERIT_NONE);
static_assert(sizeof(mach_port_t) == sizeof(uint32_t), "machport size not 32-bits");
uint32_t* notifyMachPorts;
if ( taskDyldInfo.all_image_info_format == TASK_DYLD_ALL_IMAGE_INFO_32 ) {
notifyMachPorts = (uint32_t *)((uint8_t *)localAddress + offsetof(dyld_all_image_infos_32,notifyMachPorts));
} else {
notifyMachPorts = (uint32_t *)((uint8_t *)localAddress + offsetof(dyld_all_image_infos_64,notifyMachPorts));
}
kr = f(notifyMachPorts);
(void)vm_deallocate(target_task, localAddress, size);
return kr;
}
#endif
kern_return_t dyld_process_info_notify_base::task_dyld_process_info_notify_register(task_t target_task, mach_port_t notify) {
#if TARGET_OS_SIMULATOR
static dispatch_once_t onceToken;
static kern_return_t (*tdpinr)(task_t, mach_port_t) = nullptr;
dispatch_once(&onceToken, ^{
tdpinr = (kern_return_t (*)(task_t, mach_port_t))dlsym(RTLD_DEFAULT, "task_dyld_process_info_notify_register");
});
if (tdpinr) {
return tdpinr(target_task, notify);
}
return withRemotePortArray(target_task, [this,target_task,notify](uint32_t* portArray){
mach_port_t portInTarget = MACH_PORT_NULL;
kern_return_t kr = KERN_NAME_EXISTS;
while (kr == KERN_NAME_EXISTS) {
portInTarget = MACH_PORT_NULL;
kr = mach_port_allocate(target_task, MACH_PORT_RIGHT_DEAD_NAME, &portInTarget);
if (kr != KERN_SUCCESS) {
return kr;
}
(void)mach_port_deallocate(target_task, portInTarget);
kr = mach_port_insert_right(target_task, portInTarget, notify, MACH_MSG_TYPE_MAKE_SEND);
}
if (kr != KERN_SUCCESS) {
(void)mach_port_deallocate(target_task, portInTarget);
return kr;
}
for (uint8_t notifySlot=0; notifySlot < DYLD_MAX_PROCESS_INFO_NOTIFY_COUNT; ++notifySlot) {
if (OSAtomicCompareAndSwap32(0, portInTarget, (volatile int32_t*)&portArray[notifySlot])) {
_portInTarget = portInTarget;
return KERN_SUCCESS;
}
}
(void)mach_port_deallocate(target_task, portInTarget);
return KERN_UREFS_OVERFLOW;
});
#else
return ::task_dyld_process_info_notify_register(target_task, notify);
#endif
}
kern_return_t dyld_process_info_notify_base::task_dyld_process_info_notify_deregister(task_t target_task, mach_port_t notify) {
#if TARGET_OS_SIMULATOR
static dispatch_once_t onceToken;
static kern_return_t (*tdpind)(task_t, mach_port_t) = nullptr;
dispatch_once(&onceToken, ^{
tdpind = (kern_return_t (*)(task_t, mach_port_t))dlsym(RTLD_DEFAULT, "task_dyld_process_info_notify_deregister");
});
if (tdpind) {
return tdpind(target_task, notify);
}
return withRemotePortArray(target_task, [this](uint32_t* portArray){
for (uint8_t notifySlot=0; notifySlot < DYLD_MAX_PROCESS_INFO_NOTIFY_COUNT; ++notifySlot) {
if (OSAtomicCompareAndSwap32(0, _portInTarget, (volatile int32_t*)&portArray[notifySlot])) {
return KERN_SUCCESS;
}
}
return KERN_FAILURE;
});
#else
return ::task_dyld_process_info_notify_deregister(target_task, notify);
#endif
}
dyld_process_info_notify_base::dyld_process_info_notify_base(dispatch_queue_t queue, Notify notify, NotifyExit notifyExit,
task_t task, kern_return_t* kr) :
_retainCount(0), _queue(queue), _notify(Block_copy(notify)), _notifyExit(Block_copy(notifyExit)),
_notifyMain(nullptr), _machSource(nullptr), _task(task), _port(MACH_PORT_NULL), _connected(false)
#if TARGET_OS_SIMULATOR
, _portInTarget(0)
#endif
{
assert(kr != NULL);
dispatch_retain(_queue);
mach_port_options_t options = { .flags = MPO_IMPORTANCE_RECEIVER | MPO_CONTEXT_AS_GUARD | MPO_STRICT, .mpl = { MACH_PORT_QLIMIT_DEFAULT }};
*kr = mach_port_construct(mach_task_self(), &options, (mach_port_context_t)this, &_port);
if (*kr != KERN_SUCCESS) {
teardownMachPorts();
return;
}
mach_port_t previous = MACH_PORT_NULL;
*kr = mach_port_request_notification(mach_task_self(), _port, MACH_NOTIFY_NO_SENDERS, 1, _port, MACH_MSG_TYPE_MAKE_SEND_ONCE, &previous);
if ((*kr != KERN_SUCCESS) || previous != MACH_PORT_NULL) {
teardownMachPorts();
return;
}
*kr = task_dyld_process_info_notify_register(_task, _port);
dyld3::kdebug_trace_dyld_marker(DBG_DYLD_TASK_NOTIFY_REGISTER, (uint64_t)_task, (uint64_t)_port, *kr, 0);
if (*kr != KERN_SUCCESS) {
teardownMachPorts();
return;
}
_machSource = dispatch_source_create(DISPATCH_SOURCE_TYPE_MACH_RECV, _port, 0, _queue);
if (_machSource == nullptr) {
teardownMachPorts();
return;
}
dispatch_source_set_event_handler(_machSource, ^{ handleEvent(); });
dispatch_source_set_cancel_handler(_machSource, ^{ teardownMachPorts(); });
dispatch_activate(_machSource);
_connected = true;
}
dyld_process_info_notify_base::~dyld_process_info_notify_base() {
if (_connected) { fprintf(stderr, "dyld: ~dyld_process_info_notify_base called while still connected\n"); }
Block_release(_notify);
Block_release(_notifyMain);
Block_release(_notifyExit);
dispatch_release(_queue);
}
void dyld_process_info_notify_base::teardownMachPorts() {
if ( _port != 0 ) {
kern_return_t kr = task_dyld_process_info_notify_deregister(_task, _port);
dyld3::kdebug_trace_dyld_marker(DBG_DYLD_TASK_NOTIFY_DEREGISTER, (uint64_t)_task, (uint64_t)_port, kr, 0);
(void)mach_port_destruct(mach_task_self(), _port, 0, (mach_port_context_t)this);
_port = 0;
}
}
void dyld_process_info_notify_base::disconnect() {
if (_connected) {
_connected = false;
if ( _machSource ) {
dispatch_source_cancel(_machSource);
dispatch_release(_machSource);
_machSource = NULL;
}
if (_notifyExit) {
dispatch_async(_queue, ^{
_notifyExit();
});
}
}
}
bool dyld_process_info_notify_base::enabled() const
{
return _connected;
}
void dyld_process_info_notify_base::retain()
{
_retainCount.fetch_add(1, std::memory_order_relaxed);
}
void dyld_process_info_notify_base::release()
{
if (_retainCount.fetch_sub(1, std::memory_order_acq_rel) == 0) {
disconnect();
dispatch_async(_queue, ^{
delete this;
});
}
}
void dyld_process_info_notify_base::replyToMonitoredProcess(mach_msg_header_t& header) {
mach_msg_header_t replyHeader;
replyHeader.msgh_bits = MACH_MSGH_BITS_SET(MACH_MSGH_BITS_REMOTE(header.msgh_bits), 0, 0, 0);
replyHeader.msgh_id = 0;
replyHeader.msgh_local_port = MACH_PORT_NULL;
replyHeader.msgh_remote_port = header.msgh_remote_port;
replyHeader.msgh_reserved = 0;
replyHeader.msgh_size = sizeof(replyHeader);
kern_return_t r = mach_msg(&replyHeader, MACH_SEND_MSG, replyHeader.msgh_size, 0, MACH_PORT_NULL, 0, MACH_PORT_NULL);
if (r == KERN_SUCCESS) {
header.msgh_remote_port = MACH_PORT_NULL;
} else {
disconnect();
}
}
void dyld_process_info_notify_base::handleEvent() {
if (!_connected) { return; }
uint8_t messageBuffer[DYLD_PROCESS_INFO_NOTIFY_MAX_BUFFER_SIZE] = {};
mach_msg_header_t* h = (mach_msg_header_t*)messageBuffer;
kern_return_t r = mach_msg(h, MACH_RCV_MSG | MACH_RCV_VOUCHER| MACH_RCV_TRAILER_ELEMENTS(MACH_RCV_TRAILER_AUDIT) | MACH_RCV_TRAILER_TYPE(MACH_MSG_TRAILER_FORMAT_0), 0, sizeof(messageBuffer)-sizeof(mach_msg_audit_trailer_t), _port, MACH_MSG_TIMEOUT_NONE, MACH_PORT_NULL);
if ( r == KERN_SUCCESS && !(h->msgh_bits & MACH_MSGH_BITS_COMPLEX)) {
if ( h->msgh_id == DYLD_PROCESS_INFO_NOTIFY_LOAD_ID || h->msgh_id == DYLD_PROCESS_INFO_NOTIFY_UNLOAD_ID ) {
const dyld_process_info_notify_header* header = (dyld_process_info_notify_header*)messageBuffer;
if (sizeof(*header) <= h->msgh_size
&& header->imagesOffset <= h->msgh_size
&& header->stringsOffset <= h->msgh_size
&& (header->imageCount * sizeof(dyld_process_info_image_entry)) <= (h->msgh_size - header->imagesOffset)) {
const dyld_process_info_image_entry* entries = (dyld_process_info_image_entry*)&messageBuffer[header->imagesOffset];
const char* const stringPool = (char*)&messageBuffer[header->stringsOffset];
for (unsigned i=0; i < header->imageCount; ++i) {
bool isUnload = (h->msgh_id == DYLD_PROCESS_INFO_NOTIFY_UNLOAD_ID);
if (entries[i].pathStringOffset <= h->msgh_size - header->stringsOffset) {
_notify(isUnload, header->timestamp, entries[i].loadAddress, entries[i].uuid, stringPool + entries[i].pathStringOffset);
} else {
disconnect();
break;
}
}
replyToMonitoredProcess(*h);
} else {
disconnect();
}
}
else if ( h->msgh_id == DYLD_PROCESS_INFO_NOTIFY_MAIN_ID ) {
if (h->msgh_size != sizeof(mach_msg_header_t)) {
disconnect();
} else if ( _notifyMain != NULL ) {
_notifyMain();
}
replyToMonitoredProcess(*h);
} else if ( h->msgh_id == MACH_NOTIFY_NO_SENDERS ) {
const mach_msg_audit_trailer_t *audit_tlr = (mach_msg_audit_trailer_t *)((uint8_t *)h + round_msg(h->msgh_size));
if (audit_tlr->msgh_trailer_type == MACH_MSG_TRAILER_FORMAT_0
&& audit_tlr->msgh_trailer_size >= sizeof(mach_msg_audit_trailer_t)
&& audit_tlr->msgh_audit.val[5] == 0) {
disconnect();
}
}
else {
fprintf(stderr, "dyld: received unknown message id=0x%X, size=%d\n", h->msgh_id, h->msgh_size);
}
} else {
fprintf(stderr, "dyld: received unknown message id=0x%X, size=%d\n", h->msgh_id, h->msgh_size);
}
mach_msg_destroy(h);
}
dyld_process_info_notify _dyld_process_info_notify(task_t task, dispatch_queue_t queue,
void (^notify)(bool unload, uint64_t timestamp, uint64_t machHeader, const uuid_t uuid, const char* path),
void (^notifyExit)(),
kern_return_t* kr)
{
kern_return_t krSink = KERN_SUCCESS;
if (kr == nullptr) {
kr = &krSink;
}
*kr = KERN_SUCCESS;
dyld_process_info_notify result = new dyld_process_info_notify_base(queue, notify, notifyExit, task, kr);
if (result->enabled())
return result;
const_cast<dyld_process_info_notify_base*>(result)->release();
return nullptr;
}
void _dyld_process_info_notify_main(dyld_process_info_notify object, void (^notifyMain)())
{
object->setNotifyMain(notifyMain);
}
void _dyld_process_info_notify_retain(dyld_process_info_notify object)
{
const_cast<dyld_process_info_notify_base*>(object)->retain();
}
void _dyld_process_info_notify_release(dyld_process_info_notify object)
{
const_cast<dyld_process_info_notify_base*>(object)->release();
}
static void (*sNotifyMonitoringDyldMain)() = nullptr;
static void (*sNotifyMonitoringDyld)(bool unloading, unsigned imageCount, const struct mach_header* loadAddresses[],
const char* imagePaths[]) = nullptr;
void setNotifyMonitoringDyldMain(void (*func)())
{
sNotifyMonitoringDyldMain = func;
}
void setNotifyMonitoringDyld(void (*func)(bool unloading, unsigned imageCount,
const struct mach_header* loadAddresses[],
const char* imagePaths[]))
{
sNotifyMonitoringDyld = func;
}
namespace dyld3 {
void AllImages::notifyMonitorMain()
{
#if !TARGET_OS_DRIVERKIT
assert(sNotifyMonitoringDyldMain != nullptr);
sNotifyMonitoringDyldMain();
#endif
}
void AllImages::notifyMonitorLoads(const Array<LoadedImage>& newImages)
{
#if !TARGET_OS_DRIVERKIT
assert(sNotifyMonitoringDyld != nullptr);
const struct mach_header* loadAddresses[newImages.count()];
const char* loadPaths[newImages.count()];
for(uint32_t i = 0; i<newImages.count(); ++i) {
loadAddresses[i] = newImages[i].loadedAddress();
loadPaths[i] = newImages[i].image()->path();
}
sNotifyMonitoringDyld(false, (unsigned)newImages.count(), loadAddresses, loadPaths);
#endif
}
void AllImages::notifyMonitorUnloads(const Array<LoadedImage>& unloadingImages)
{
#if !TARGET_OS_DRIVERKIT
assert(sNotifyMonitoringDyld != nullptr);
const struct mach_header* loadAddresses[unloadingImages.count()];
const char* loadPaths[unloadingImages.count()];
for(uint32_t i = 0; i<unloadingImages.count(); ++i) {
loadAddresses[i] = unloadingImages[i].loadedAddress();
loadPaths[i] = unloadingImages[i].image()->path();
}
sNotifyMonitoringDyld(true, (unsigned)unloadingImages.count(), loadAddresses, loadPaths);
#endif
}
}