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--- dyld/dyld-421.2/src/dyld_process_info_notify.cpp
+++ dyld/dyld-851.27/src/dyld_process_info_notify.cpp
@@ -29,282 +29,457 @@
#include <mach/shared_region.h>
#include <mach/mach_vm.h>
#include <libkern/OSAtomic.h>
-
-#include "dyld_process_info.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 "dyld_images.h"
-#include "dyld_priv.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)();
//
// Object used for monitoring another processes dyld loads
//
struct __attribute__((visibility("hidden"))) dyld_process_info_notify_base
{
- static dyld_process_info_notify_base* make(task_t task, dispatch_queue_t queue, Notify notify, NotifyExit notifyExit, kern_return_t* kr);
- ~dyld_process_info_notify_base();
-
- uint32_t& retainCount() const { return _retainCount; }
+ 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);
+ }
+
+ // override new and delete so we don't need to link with libc++
+ static void* operator new(size_t sz) { return malloc(sz); }
+ static void operator delete(void* p) { free(p); }
private:
- dyld_process_info_notify_base(dispatch_queue_t queue, Notify notify, NotifyExit notifyExit, task_t task);
- kern_return_t makePorts();
- kern_return_t pokeSendPortIntoTarget();
- kern_return_t unpokeSendPortInTarget();
- void setMachSourceOnQueue();
- void* operator new (size_t, void* buf) { return buf; }
-
- mutable uint32_t _retainCount;
- dispatch_queue_t _queue;
- Notify _notify;
- NotifyExit _notifyExit;
- task_t _targetTask;
- dispatch_source_t _machSource;
- uint64_t _portAddressInTarget;
- mach_port_t _sendPortInTarget; // target is process being watched for image loading/unloading
- mach_port_t _receivePortInMonitor; // monitor is process being notified of image loading/unloading
+ 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; // monitor is process being notified of image loading/unloading
+ std::atomic<bool> _connected;
+#if TARGET_OS_SIMULATOR
+ uint32_t _portInTarget;
+#endif
};
-
-dyld_process_info_notify_base::dyld_process_info_notify_base(dispatch_queue_t queue, Notify notify, NotifyExit notifyExit, task_t task)
- : _retainCount(1), _queue(queue), _notify(notify), _notifyExit(notifyExit), _targetTask(task), _machSource(NULL), _portAddressInTarget(0), _sendPortInTarget(0), _receivePortInMonitor(0)
-{
+#if TARGET_OS_SIMULATOR
+
+template<typename F>
+kern_return_t withRemotePortArray(task_t target_task, F f) {
+ // Get the all image info
+ 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, // mask
+ 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);
+ }
+ // Our libsystem does not have task_dyld_process_info_notify_register, emulate
+ return withRemotePortArray(target_task, [this,target_task,notify](uint32_t* portArray){
+ mach_port_t portInTarget = MACH_PORT_NULL;
+ // Insert the right
+ 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);
+ }
+ // The call is not succesfull return
+ if (kr != KERN_SUCCESS) {
+ (void)mach_port_deallocate(target_task, portInTarget);
+ return kr;
+ }
+ // Find a slot for the right
+ 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;
+ }
+ }
+ // The array was full, we need to fail
+ (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);
+ }
+ // Our libsystem does not have task_dyld_process_info_notify_deregister, emulate
+ return withRemotePortArray(target_task, [this](uint32_t* portArray){
+ // Find a slot for the right
+ 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
+ // Our libsystem does not have task_dyld_process_info_notify_deregister, emulate
+ 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);
-}
-
-dyld_process_info_notify_base::~dyld_process_info_notify_base()
-{
- if ( _machSource ) {
- dispatch_release(_machSource);
- _machSource = NULL;
- }
- if ( _portAddressInTarget ) {
- unpokeSendPortInTarget();
- _portAddressInTarget = 0;
- }
- if ( _sendPortInTarget ) {
- _sendPortInTarget = 0;
- }
+ // Allocate a port to listen on in this monitoring task
+ 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;
+ }
+ //FIXME: Should we retry here if we fail?
+ *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;
+ }
+
+ // Setup the event handler for the port
+ _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);
- if ( _receivePortInMonitor != 0 ) {
- mach_port_deallocate(mach_task_self(), _receivePortInMonitor);
- _receivePortInMonitor = 0;
- }
-}
-
-
-dyld_process_info_notify_base* dyld_process_info_notify_base::make(task_t task, dispatch_queue_t queue, Notify notify, NotifyExit notifyExit, kern_return_t* kr)
-{
- void* storage = malloc(sizeof(dyld_process_info_notify_base));
- dyld_process_info_notify_base* obj = new (storage) dyld_process_info_notify_base(queue, notify, notifyExit, task);
-
- if ( kern_return_t r = obj->makePorts() ) {
- if ( kr != NULL )
- *kr = r;
- goto fail;
- }
-
- obj->setMachSourceOnQueue();
-
- if ( kern_return_t r = obj->pokeSendPortIntoTarget() ) {
- if ( kr != NULL )
- *kr = r;
- goto fail;
- }
-
- if ( kr != NULL )
- *kr = KERN_SUCCESS;
- return obj;
-
-fail:
- free(obj);
- return NULL;
-}
-
-
-kern_return_t dyld_process_info_notify_base::makePorts()
-{
- // Allocate a port to listen on in this monitoring task
- if ( kern_return_t r = mach_port_allocate(mach_task_self(), MACH_PORT_RIGHT_RECEIVE, &_receivePortInMonitor) )
- return r;
-
- // Add send rights for replying
- if ( kern_return_t r = mach_port_insert_right(mach_task_self(), _receivePortInMonitor, _receivePortInMonitor, MACH_MSG_TYPE_MAKE_SEND) )
- return r;
-
- // Allocate a name in the target. We need a new name to add send rights to
- if ( kern_return_t r = mach_port_allocate(_targetTask, MACH_PORT_RIGHT_DEAD_NAME, &_sendPortInTarget) )
- return r;
-
- // Deallocate the dead name
- if ( kern_return_t r = mach_port_mod_refs(_targetTask, _sendPortInTarget, MACH_PORT_RIGHT_DEAD_NAME, -1) )
- return r;
-
- // Make the dead name a send right to our listening port
- if ( kern_return_t r = mach_port_insert_right(_targetTask, _sendPortInTarget, _receivePortInMonitor, MACH_MSG_TYPE_MAKE_SEND) )
- return r;
-
- // Notify us if the target dies
- mach_port_t previous = MACH_PORT_NULL;
- if ( kern_return_t r = mach_port_request_notification(_targetTask, _sendPortInTarget, MACH_NOTIFY_DEAD_NAME, 0, _receivePortInMonitor, MACH_MSG_TYPE_MAKE_SEND_ONCE, &previous))
- return r;
-
- //fprintf(stderr, "_sendPortInTarget=%d, _receivePortInMonitor=%d\n", _sendPortInTarget, _receivePortInMonitor);
- return KERN_SUCCESS;
-}
-
-
-
-void dyld_process_info_notify_base::setMachSourceOnQueue()
-{
- NotifyExit exitHandler = _notifyExit;
- _machSource = dispatch_source_create(DISPATCH_SOURCE_TYPE_MACH_RECV, _receivePortInMonitor, 0, _queue);
- dispatch_source_set_event_handler(_machSource, ^{
- 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, 0, sizeof(messageBuffer), _receivePortInMonitor, MACH_MSG_TIMEOUT_NONE, MACH_PORT_NULL);
- if ( r == KERN_SUCCESS ) {
- //fprintf(stderr, "received message id=0x%X, size=%d\n", h->msgh_id, h->msgh_size);
- if ( h->msgh_id == DYLD_PROCESS_INFO_NOTIFY_LOAD_ID || h->msgh_id == DYLD_PROCESS_INFO_NOTIFY_UNLOAD_ID ) {
- // run notifier block for each [un]load image
- const dyld_process_info_notify_header* header = (dyld_process_info_notify_header*)messageBuffer;
- 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);
- _notify(isUnload, header->timestamp, entries[i].loadAddress, entries[i].uuid, stringPool + entries[i].pathStringOffset);
- }
- // reply to dyld, so it can continue
- mach_msg_header_t replyHeader;
- replyHeader.msgh_bits = MACH_MSGH_BITS(MACH_MSG_TYPE_COPY_SEND, MACH_MSG_TYPE_MAKE_SEND);
- replyHeader.msgh_id = 0;
- replyHeader.msgh_local_port = MACH_PORT_NULL;
- replyHeader.msgh_remote_port = h->msgh_remote_port;
- replyHeader.msgh_reserved = 0;
- replyHeader.msgh_size = sizeof(replyHeader);
- mach_msg(&replyHeader, MACH_SEND_MSG | MACH_SEND_TIMEOUT, replyHeader.msgh_size, 0, MACH_PORT_NULL, 100, MACH_PORT_NULL);
- }
- else if ( h->msgh_id == MACH_NOTIFY_PORT_DELETED ) {
- mach_port_t deadPort = ((mach_port_deleted_notification_t *)h)->not_port;
- //fprintf(stderr, "received message id=MACH_NOTIFY_PORT_DELETED, size=%d, deadPort=%d\n", h->msgh_size, deadPort);
- if ( deadPort == _sendPortInTarget ) {
- // target process died. Clean up ports
- _sendPortInTarget = 0;
- mach_port_deallocate(mach_task_self(), _receivePortInMonitor);
- _receivePortInMonitor = 0;
- _portAddressInTarget = 0;
- // notify that target is gone
- exitHandler();
- }
- }
- else {
- fprintf(stderr, "received unknown message id=0x%X, size=%d\n", h->msgh_id, h->msgh_size);
- }
- }
- });
- dispatch_resume(_machSource);
-}
-
-
-kern_return_t dyld_process_info_notify_base::pokeSendPortIntoTarget()
-{
- // get location on all_image_infos in target task
- task_dyld_info_data_t taskDyldInfo;
- mach_msg_type_number_t count = TASK_DYLD_INFO_COUNT;
- kern_return_t r = task_info(_targetTask, TASK_DYLD_INFO, (task_info_t)&taskDyldInfo, &count);
- if ( r )
- return r;
-
- // remap the page containing all_image_infos into this process r/w
- mach_vm_address_t mappedAddress = 0;
- mach_vm_size_t mappedSize = taskDyldInfo.all_image_info_size;
- vm_prot_t curProt = VM_PROT_NONE;
- vm_prot_t maxProt = VM_PROT_NONE;
- r = mach_vm_remap(mach_task_self(), &mappedAddress, mappedSize, 0, VM_FLAGS_ANYWHERE | VM_FLAGS_RETURN_DATA_ADDR,
- _targetTask, taskDyldInfo.all_image_info_addr, false, &curProt, &maxProt, VM_INHERIT_NONE);
- if ( r )
- return r;
- if ( curProt != (VM_PROT_READ|VM_PROT_WRITE) )
- return KERN_PROTECTION_FAILURE;
-
- // atomically set port into all_image_info_struct
- static_assert(sizeof(mach_port_t) == sizeof(uint32_t), "machport size not 32-bits");
-
- mach_vm_address_t mappedAddressToPokePort = 0;
- if ( taskDyldInfo.all_image_info_format == TASK_DYLD_ALL_IMAGE_INFO_32 )
- mappedAddressToPokePort = mappedAddress + offsetof(dyld_all_image_infos_32,notifyMachPorts);
- else
- mappedAddressToPokePort = mappedAddress + offsetof(dyld_all_image_infos_64,notifyMachPorts);
-
- // use first available slot
- bool slotFound = false;
- for (int slotIndex=0; slotIndex < DYLD_MAX_PROCESS_INFO_NOTIFY_COUNT; ++slotIndex) {
- if ( OSAtomicCompareAndSwap32Barrier(0, _sendPortInTarget, (volatile int32_t*)mappedAddressToPokePort) ) {
- slotFound = true;
- break;
- }
- mappedAddressToPokePort += sizeof(uint32_t);
- }
- if ( !slotFound ) {
- mach_vm_deallocate(mach_task_self(), mappedAddress, mappedSize);
- return KERN_UREFS_OVERFLOW;
- }
- _portAddressInTarget = taskDyldInfo.all_image_info_addr + mappedAddressToPokePort - mappedAddress;
- //fprintf(stderr, "poked port %d into target at address 0x%llX\n", _sendPortInTarget, _portAddressInTarget);
- mach_vm_deallocate(mach_task_self(), mappedAddress, mappedSize);
- return r;
-}
-
-
-
-kern_return_t dyld_process_info_notify_base::unpokeSendPortInTarget()
-{
- // remap the page containing all_image_infos into this process r/w
- mach_vm_address_t mappedAddress = 0;
- mach_vm_size_t mappedSize = sizeof(mach_port_t);
- vm_prot_t curProt = VM_PROT_NONE;
- vm_prot_t maxProt = VM_PROT_NONE;
- kern_return_t r = mach_vm_remap(mach_task_self(), &mappedAddress, mappedSize, 0, VM_FLAGS_ANYWHERE | VM_FLAGS_RETURN_DATA_ADDR,
- _targetTask, _portAddressInTarget, false, &curProt, &maxProt, VM_INHERIT_NONE);
- if ( r )
- return r;
- if ( curProt != (VM_PROT_READ|VM_PROT_WRITE) )
- return KERN_PROTECTION_FAILURE;
-
- OSAtomicCompareAndSwap32Barrier(_sendPortInTarget, 0, (volatile int32_t*)mappedAddress);
-
- //fprintf(stderr, "cleared port %d from target\n", _sendPortInTarget);
- mach_vm_deallocate(mach_task_self(), mappedAddress, mappedSize);
- return r;
-}
-
-
+}
+
+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;
+ // The connection to the target is dead. Clean up ports
+ if ( _machSource ) {
+ dispatch_source_cancel(_machSource);
+ dispatch_release(_machSource);
+ _machSource = NULL;
+ }
+ if (_notifyExit) {
+ dispatch_async(_queue, ^{
+ // There was a not a mach source, so if we have any ports they will not get torn down by its cancel handler
+ _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) {
+ // When we subtracted the ref count was 0, which means it was the last reference
+ 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() {
+ // References object may still exist even after the ports are dead. Disable event dispatching
+ // if the ports have been torn down.
+ if (!_connected) { return; }
+
+ // This event handler block has an implicit reference to "this"
+ // if incrementing the count goes to one, that means the object may have already been destroyed
+ 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)) {
+ //fprintf(stderr, "received message id=0x%X, size=%d\n", h->msgh_id, h->msgh_size);
+
+ if ( h->msgh_id == DYLD_PROCESS_INFO_NOTIFY_LOAD_ID || h->msgh_id == DYLD_PROCESS_INFO_NOTIFY_UNLOAD_ID ) {
+ // run notifier block for each [un]load image
+ 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) {
+ //fprintf(stderr, "Notifying about: %s\n", stringPool + entries[i].pathStringOffset);
+ _notify(isUnload, header->timestamp, entries[i].loadAddress, entries[i].uuid, stringPool + entries[i].pathStringOffset);
+ } else {
+ disconnect();
+ break;
+ }
+ }
+ // reply to dyld, so it can continue
+ 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 ) {
+ // Validate this notification came from the kernel
+ 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)
+ // We cannot link to libbsm, so we are hardcoding the audit token offset (5)
+ // And the value the represents the kernel (0)
+ && 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)
{
- return dyld_process_info_notify_base::make(task, queue, notify, notifyExit, 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)
{
- object->retainCount() += 1;
+ const_cast<dyld_process_info_notify_base*>(object)->retain();
}
void _dyld_process_info_notify_release(dyld_process_info_notify object)
{
- object->retainCount() -= 1;
- if ( object->retainCount() == 0 ) {
- object->~dyld_process_info_notify_base();
- free((void*)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
+}
+
+} // namespace dyld3
+
+
+
+