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--- dyld/dyld-640.2/src/dyld_process_info_notify.cpp
+++ dyld/dyld-551.4/src/dyld_process_info_notify.cpp
@@ -29,352 +29,312 @@
#include <mach/shared_region.h>
#include <mach/mach_vm.h>
#include <libkern/OSAtomic.h>
-#include <execinfo.h>
-
#include "dyld_process_info.h"
#include "dyld_process_info_internal.h"
#include "dyld_images.h"
#include "dyld_priv.h"
+#include "LaunchCache.h"
#include "Loading.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
{
- 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();
+ 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();
+
+ bool incRetainCount() const;
+ bool decRetainCount() const;
void setNotifyMain(NotifyMain notifyMain) const { _notifyMain = 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); }
+ static void operator delete(void* p) { return free(p); }
private:
- void handleEvent();
- void teardown();
- void replyToMonitoredProcess(mach_msg_header_t& header);
-
- RemoteBuffer _remoteAllImageInfoBuffer;
- uint32_t* _notifyMachPorts;
- uint32_t _notifySlot;
- mutable std::atomic<int32_t> _retainCount;
- dispatch_queue_t _queue;
- Notify _notify;
- NotifyExit _notifyExit;
- mutable NotifyMain _notifyMain;
- task_t _targetTask;
- dispatch_source_t _machSource;
- 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
- std::atomic<bool> _disabled;
+ 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();
+
+ mutable int32_t _retainCount;
+ dispatch_queue_t _queue;
+ Notify _notify;
+ NotifyExit _notifyExit;
+ mutable NotifyMain _notifyMain;
+ 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
};
-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) :
- _notifyMachPorts(nullptr), _notifySlot(0), _retainCount(1), _queue(queue), _notify(notify), _notifyExit(notifyExit),
- _notifyMain(nullptr), _targetTask(task), _machSource(nullptr), _sendPortInTarget(0), _receivePortInMonitor(0),
- _disabled(false)
-{
- assert(_disabled == false);
+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), _notifyMain(NULL), _targetTask(task), _machSource(NULL), _portAddressInTarget(0), _sendPortInTarget(0), _receivePortInMonitor(0)
+{
dispatch_retain(_queue);
+}
+
+dyld_process_info_notify_base::~dyld_process_info_notify_base()
+{
+ if ( _machSource ) {
+ dispatch_source_cancel(_machSource);
+ dispatch_release(_machSource);
+ _machSource = NULL;
+ }
+ if ( _portAddressInTarget ) {
+ unpokeSendPortInTarget();
+ _portAddressInTarget = 0;
+ }
+ if ( _sendPortInTarget ) {
+ _sendPortInTarget = 0;
+ }
+ dispatch_release(_queue);
+ if ( _receivePortInMonitor != 0 ) {
+ mach_port_deallocate(mach_task_self(), _receivePortInMonitor);
+ _receivePortInMonitor = 0;
+ }
+}
+
+bool dyld_process_info_notify_base::incRetainCount() const
+{
+ int32_t newCount = OSAtomicIncrement32(&_retainCount);
+ return ( newCount == 1 );
+}
+
+bool dyld_process_info_notify_base::decRetainCount() const
+{
+ int32_t newCount = OSAtomicDecrement32(&_retainCount);
+ return ( newCount == 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)
+{
+ dyld_process_info_notify_base* obj = new 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:
+ delete obj;
+ return NULL;
+}
+
+
+kern_return_t dyld_process_info_notify_base::makePorts()
+{
// 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 }};
- if ((*kr = mach_port_construct(mach_task_self(), &options, (mach_port_context_t)this, &_receivePortInMonitor))) {
- teardown();
- return;
- }
- if (_targetTask == mach_task_self()) {
- _sendPortInTarget = _receivePortInMonitor;
- (void)mach_port_insert_right(_targetTask, _sendPortInTarget, _receivePortInMonitor, MACH_MSG_TYPE_MAKE_SEND);
- } else {
- // Insert a deadname right into the port to trigger notifications
- kern_return_t r = KERN_NAME_EXISTS;
- while (r == KERN_NAME_EXISTS) {
- _sendPortInTarget = MACH_PORT_NULL;
- //FIXME file radar
- r = mach_port_allocate(_targetTask, MACH_PORT_RIGHT_DEAD_NAME, &_sendPortInTarget);
- if (r != KERN_SUCCESS) {
- *kr = r;
- return;
- }
- (void)mach_port_deallocate(_targetTask, _sendPortInTarget);
- r = mach_port_insert_right(_targetTask, _sendPortInTarget, _receivePortInMonitor, MACH_MSG_TYPE_MAKE_SEND);
+ 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, ^{
+ // 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
+ if ( incRetainCount() )
+ 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, 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 == DYLD_PROCESS_INFO_NOTIFY_MAIN_ID ) {
+ if ( _notifyMain != NULL ) {
+ _notifyMain();
+ }
+ // 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);
+ }
}
- if (r != KERN_SUCCESS) {
- *kr = r;
- return;
- }
-
- // Notify us if the target dies
- mach_port_t previous = MACH_PORT_NULL;
- if ((*kr = mach_port_request_notification(_targetTask, _sendPortInTarget, MACH_NOTIFY_DEAD_NAME, 0, _receivePortInMonitor, MACH_MSG_TYPE_MAKE_SEND_ONCE, &previous))) {
- (void)mach_port_deallocate(_targetTask, _sendPortInTarget);
- (void)mach_port_destruct(mach_task_self(), _receivePortInMonitor, 0, (mach_port_context_t)this);
- teardown();
- return;
- }
- // This is a new port, if there is a previous notifier attached then something is wrong... abort.
- if (previous != MACH_PORT_NULL) {
- (void)mach_port_deallocate(mach_task_self(), previous);
- (void)mach_port_deallocate(_targetTask, _sendPortInTarget);
- (void)mach_port_destruct(mach_task_self(), _receivePortInMonitor, 0, (mach_port_context_t)this);
- teardown();
- return;
- }
- }
-
- // Setup the event handler for the port
- _machSource = dispatch_source_create(DISPATCH_SOURCE_TYPE_MACH_RECV, _receivePortInMonitor, 0, _queue);
- if (_machSource == nullptr) {
- (void)mach_port_deallocate(_targetTask, _sendPortInTarget);
- (void)mach_port_destruct(mach_task_self(), _receivePortInMonitor, 0, (mach_port_context_t)this);
- teardown();
- return;
- }
- dispatch_source_set_event_handler(_machSource, ^{
- handleEvent();
- });
- dispatch_source_set_cancel_handler(_machSource, ^{
- if ( _receivePortInMonitor != 0 ) {
- (void)mach_port_destruct(mach_task_self(), _receivePortInMonitor, 0, (mach_port_context_t)this);
- _receivePortInMonitor = 0;
- }
- });
- dispatch_activate(_machSource);
-
- // get location on all_image_infos in the target task
+ if ( decRetainCount() )
+ delete this;
+ });
+ 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 taskDyldInfoCount = TASK_DYLD_INFO_COUNT;
- if ((*kr = task_info(_targetTask, TASK_DYLD_INFO, (task_info_t)&taskDyldInfo, &taskDyldInfoCount))) {
- (void)mach_port_deallocate(_targetTask, _sendPortInTarget);
- teardown();
- return;
- }
- // Poke the portname of our port into the target task
- _remoteAllImageInfoBuffer = RemoteBuffer(_targetTask, taskDyldInfo.all_image_info_addr, taskDyldInfo.all_image_info_size, true, false);
- *kr = _remoteAllImageInfoBuffer.getKernelReturn();
- if (*kr) {
- (void)mach_port_deallocate(_targetTask, _sendPortInTarget);
- teardown();
- return;
- }
-
+ 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");
- if ( taskDyldInfo.all_image_info_format == TASK_DYLD_ALL_IMAGE_INFO_32 ) {
- _notifyMachPorts = (uint32_t *)((uint8_t *)_remoteAllImageInfoBuffer.getLocalAddress() + offsetof(dyld_all_image_infos_32,notifyMachPorts));
- } else {
- _notifyMachPorts = (uint32_t *)((uint8_t *)_remoteAllImageInfoBuffer.getLocalAddress() + offsetof(dyld_all_image_infos_64,notifyMachPorts));
- }
-
-#if 0
- //If all the slots are filled we will sleep and retry a few times before giving up
- for (uint32_t i=0; i<10; ++i) {
- for (_notifySlot=0; _notifySlot < DYLD_MAX_PROCESS_INFO_NOTIFY_COUNT; ++_notifySlot) {
- if (OSAtomicCompareAndSwap32(0, _sendPortInTarget, (volatile int32_t*)&_notifyMachPorts[_notifySlot])) {
- break;
- }
- }
- if (_notifySlot == DYLD_MAX_PROCESS_INFO_NOTIFY_COUNT) {
- // all the slots are filled, sleep and try again
- usleep(1000 * 50); // 50ms
- } else {
- // if _notifySlot is set we are done
- break;
- }
- }
-#else
- for (_notifySlot=0; _notifySlot < DYLD_MAX_PROCESS_INFO_NOTIFY_COUNT; ++_notifySlot) {
- if (OSAtomicCompareAndSwap32(0, _sendPortInTarget, (volatile int32_t*)&_notifyMachPorts[_notifySlot])) {
- break;
- }
- }
-#endif
-
- if (_notifySlot == DYLD_MAX_PROCESS_INFO_NOTIFY_COUNT) {
- (void)mach_port_deallocate(_targetTask, _sendPortInTarget);
- teardown();
- *kr = KERN_UREFS_OVERFLOW;
- return;
- }
-
- *kr = KERN_SUCCESS;
-}
-
-dyld_process_info_notify_base::~dyld_process_info_notify_base() {
- if (!_disabled) {
- fprintf(stderr, "dyld: ~dyld_process_info_notify_base called while still enabled\n");
- }
- dispatch_release(_queue);
-}
-
-void dyld_process_info_notify_base::teardown() {
- if (!_disabled) {
- _disabled = true;
- // The connection to the target is dead. Clean up ports
- if ( _remoteAllImageInfoBuffer.getLocalAddress() != 0 && _notifySlot < DYLD_MAX_PROCESS_INFO_NOTIFY_COUNT) {
- mach_port_t extractedPort = MACH_PORT_NULL;
- mach_msg_type_name_t extractedPortType;
- kern_return_t kr = mach_port_extract_right(_targetTask, _sendPortInTarget, MACH_MSG_TYPE_COPY_SEND, &extractedPort, &extractedPortType);
- if (kr == KERN_SUCCESS) {
- if (extractedPort == _receivePortInMonitor) {
- if (OSAtomicCompareAndSwap32(_sendPortInTarget, 0, (volatile int32_t*)&_notifyMachPorts[_notifySlot])) {
- (void)mach_port_deallocate(_targetTask, _sendPortInTarget);
- }
- }
- (void)mach_port_deallocate(mach_task_self(), extractedPort);
- }
- }
- _sendPortInTarget = 0;
- 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 !_disabled;
-}
-
-void dyld_process_info_notify_base::retain()
-{
- _retainCount++;
-}
-
-void dyld_process_info_notify_base::release()
-{
- uint32_t newCount = --_retainCount;
-
- if ( newCount == 0 ) {
- teardown();
- }
- 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 {
- teardown();
- }
-}
-
-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 (_disabled) {
- 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), _receivePortInMonitor, 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 {
- teardown();
- break;
- }
- }
- // reply to dyld, so it can continue
- replyToMonitoredProcess(*h);
- } else {
- teardown();
- }
- }
- else if ( h->msgh_id == DYLD_PROCESS_INFO_NOTIFY_MAIN_ID ) {
- if (h->msgh_size != sizeof(mach_msg_header_t)) {
- teardown();
- } else if ( _notifyMain != NULL ) {
- _notifyMain();
- }
- replyToMonitoredProcess(*h);
- } else if ( h->msgh_id == MACH_NOTIFY_PORT_DELETED ) {
- mach_port_t deadPort = ((mach_port_deleted_notification_t *)h)->not_port;
- // 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
- && deadPort == _sendPortInTarget ) {
- teardown();
- }
- }
- else {
- fprintf(stderr, "dyld: received unknown message id=0x%X, size=%d\n", h->msgh_id, h->msgh_size);
- }
- }
- mach_msg_destroy(h);
-}
+
+ 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;
+}
+
+
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;
+ return dyld_process_info_notify_base::make(task, queue, notify, notifyExit, kr);
}
void _dyld_process_info_notify_main(dyld_process_info_notify object, void (^notifyMain)())
@@ -384,60 +344,181 @@
void _dyld_process_info_notify_retain(dyld_process_info_notify object)
{
- const_cast<dyld_process_info_notify_base*>(object)->retain();
+ object->incRetainCount();
}
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;
-}
+ // Note if _machSource is currently handling a message, the retain count will not be zero
+ // and object will instead be deleted when handling is done.
+ if ( object->decRetainCount() )
+ delete object;
+}
+
+
+
+
+
+
namespace dyld3 {
+
+static mach_port_t sNotifyReplyPorts[DYLD_MAX_PROCESS_INFO_NOTIFY_COUNT];
+static bool sZombieNotifiers[DYLD_MAX_PROCESS_INFO_NOTIFY_COUNT];
+
+static void notifyMonitoringDyld(bool unloading, unsigned portSlot, const launch_cache::DynArray<loader::ImageInfo>& imageInfos)
+{
+ if ( sZombieNotifiers[portSlot] )
+ return;
+
+ unsigned entriesSize = (unsigned)imageInfos.count()*sizeof(dyld_process_info_image_entry);
+ unsigned pathsSize = 0;
+ for (uintptr_t i=0; i < imageInfos.count(); ++i) {
+ launch_cache::Image image(imageInfos[i].imageData);
+ pathsSize += (strlen(image.path()) + 1);
+ }
+ unsigned totalSize = (sizeof(dyld_process_info_notify_header) + MAX_TRAILER_SIZE + 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 = (unsigned)imageInfos.count()/2;
+ const launch_cache::DynArray<loader::ImageInfo> firstHalf(imageHalfCount, (loader::ImageInfo*)&imageInfos[0]);
+ const launch_cache::DynArray<loader::ImageInfo> secondHalf(imageInfos.count() - imageHalfCount, (loader::ImageInfo*)&imageInfos[imageHalfCount]);
+ notifyMonitoringDyld(unloading, portSlot, firstHalf);
+ notifyMonitoringDyld(unloading, portSlot, secondHalf);
+ return;
+ }
+ // build buffer to send
+ dyld_all_image_infos* allImageInfo = gAllImages.oldAllImageInfo();
+ uint8_t buffer[totalSize];
+ dyld_process_info_notify_header* header = (dyld_process_info_notify_header*)buffer;
+ header->version = 1;
+ header->imageCount = (uint32_t)imageInfos.count();
+ header->imagesOffset = sizeof(dyld_process_info_notify_header);
+ header->stringsOffset = sizeof(dyld_process_info_notify_header) + entriesSize;
+ header->timestamp = allImageInfo->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 (uintptr_t i=0; i < imageInfos.count(); ++i) {
+ launch_cache::Image image(imageInfos[i].imageData);
+ strcpy(pathPool, image.path());
+ uint32_t len = (uint32_t)strlen(pathPool);
+ memcpy(entries->uuid, image.uuid(), sizeof(uuid_t));
+ entries->loadAddress = (uint64_t)imageInfos[i].loadAddress;
+ entries->pathStringOffset = (uint32_t)(pathPool - pathPoolStart);
+ entries->pathLength = len;
+ pathPool += (len +1);
+ ++entries;
+ }
+ // lazily alloc reply port
+ 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);
+ //log("allocated reply port %d\n", sNotifyReplyPorts[portSlot]);
+ }
+ //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 = allImageInfo->notifyPorts[portSlot];
+ h->msgh_reserved = 0;
+ h->msgh_size = (mach_msg_size_t)sizeof(buffer);
+ //log("sending to port[%d]=%d, size=%d, reply port=%d, id=0x%X\n", portSlot, allImageInfo->notifyPorts[portSlot], h->msgh_size, sNotifyReplyPorts[portSlot], h->msgh_id);
+ kern_return_t sendResult = mach_msg(h, MACH_SEND_MSG | MACH_RCV_MSG | MACH_RCV_TIMEOUT, h->msgh_size, h->msgh_size, sNotifyReplyPorts[portSlot], 2000, MACH_PORT_NULL);
+ //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
+ //log("process requesting notification gone. deallocation send port %d and receive port %d\n", allImageInfo->notifyPorts[portSlot], sNotifyReplyPorts[portSlot]);
+ mach_port_deallocate(mach_task_self(), allImageInfo->notifyPorts[portSlot]);
+ mach_port_deallocate(mach_task_self(), sNotifyReplyPorts[portSlot]);
+ allImageInfo->notifyPorts[portSlot] = 0;
+ sNotifyReplyPorts[portSlot] = 0;
+ }
+ else if ( sendResult == MACH_RCV_TIMED_OUT ) {
+ // client took too long, ignore him from now on
+ sZombieNotifiers[portSlot] = true;
+ mach_port_deallocate(mach_task_self(), sNotifyReplyPorts[portSlot]);
+ sNotifyReplyPorts[portSlot] = 0;
+ }
+}
+
void AllImages::notifyMonitorMain()
{
- assert(sNotifyMonitoringDyldMain != nullptr);
- sNotifyMonitoringDyldMain();
-}
-
-void AllImages::notifyMonitorLoads(const Array<LoadedImage>& newImages)
-{
- 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);
-}
-
-void AllImages::notifyMonitorUnloads(const Array<LoadedImage>& unloadingImages)
-{
- 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);
+ dyld_all_image_infos* allImageInfo = gAllImages.oldAllImageInfo();
+ for (int slot=0; slot < DYLD_MAX_PROCESS_INFO_NOTIFY_COUNT; ++slot) {
+ if ( (allImageInfo->notifyPorts[slot] != 0 ) && !sZombieNotifiers[slot] ) {
+ 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");
+ uint8_t messageBuffer[sizeof(mach_msg_header_t) + MAX_TRAILER_SIZE];
+ mach_msg_header_t* h = (mach_msg_header_t*)messageBuffer;
+ 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 = allImageInfo->notifyPorts[slot];
+ h->msgh_reserved = 0;
+ h->msgh_size = (mach_msg_size_t)sizeof(messageBuffer);
+ //dyld::log("sending to port[%d]=%d, size=%d, reply port=%d, id=0x%X\n", slot, allImageInfo->notifyPorts[slot], h->msgh_size, sNotifyReplyPorts[slot], h->msgh_id);
+ kern_return_t sendResult = mach_msg(h, MACH_SEND_MSG | MACH_RCV_MSG | MACH_RCV_TIMEOUT, h->msgh_size, h->msgh_size, sNotifyReplyPorts[slot], 2000, 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", allImageInfo->notifyPorts[slot], sNotifyReplyPorts[slot]);
+ mach_port_deallocate(mach_task_self(), allImageInfo->notifyPorts[slot]);
+ mach_port_deallocate(mach_task_self(), sNotifyReplyPorts[slot]);
+ allImageInfo->notifyPorts[slot] = 0;
+ sNotifyReplyPorts[slot] = 0;
+ }
+ else if ( sendResult == MACH_RCV_TIMED_OUT ) {
+ // client took too long, ignore him from now on
+ sZombieNotifiers[slot] = true;
+ mach_port_deallocate(mach_task_self(), sNotifyReplyPorts[slot]);
+ sNotifyReplyPorts[slot] = 0;
+ }
+ }
+ }
+}
+
+void AllImages::notifyMonitorLoads(const launch_cache::DynArray<loader::ImageInfo>& newImages)
+{
+ // notify each monitoring process
+ dyld_all_image_infos* allImageInfo = gAllImages.oldAllImageInfo();
+ for (int slot=0; slot < DYLD_MAX_PROCESS_INFO_NOTIFY_COUNT; ++slot) {
+ if ( allImageInfo->notifyPorts[slot] != 0 ) {
+ notifyMonitoringDyld(false, slot, newImages);
+ }
+ 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;
+ sZombieNotifiers[slot] = false;
+ }
+ }
+}
+
+void AllImages::notifyMonitorUnloads(const launch_cache::DynArray<loader::ImageInfo>& unloadingImages)
+{
+ // notify each monitoring process
+ dyld_all_image_infos* allImageInfo = gAllImages.oldAllImageInfo();
+ for (int slot=0; slot < DYLD_MAX_PROCESS_INFO_NOTIFY_COUNT; ++slot) {
+ if ( allImageInfo->notifyPorts[slot] != 0 ) {
+ notifyMonitoringDyld(true, slot, unloadingImages);
+ }
+ 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;
+ sZombieNotifiers[slot] = false;
+ }
+ }
}
} // namespace dyld3