[apple/xnu.git] / osfmk / corpses / corpse.c

/*
 * Copyright (c) 2012-2013, 2015 Apple Inc. All rights reserved.
 *
 * @APPLE_OSREFERENCE_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. The rights granted to you under the License
 * may not be used to create, or enable the creation or redistribution of,
 * unlawful or unlicensed copies of an Apple operating system, or to
 * circumvent, violate, or enable the circumvention or violation of, any
 * terms of an Apple operating system software license agreement.
 *
 * 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.
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 */


/*
 * Corpses Overview
 * ================
 *
 * A corpse is a state of process that is past the point of its death. This means that process has
 * completed all its termination operations like releasing file descriptors, mach ports, sockets and
 * other constructs used to identify a process. For all the processes this mimics the behavior as if
 * the process has died and no longer available by any means.
 *
 * Why do we need Corpses?
 * -----------------------
 * For crash inspection we need to inspect the state and data that is associated with process so that
 * crash reporting infrastructure can build backtraces, find leaks etc. For example a crash
 *
 * Corpses functionality in kernel
 * ===============================
 * The corpse functionality is an extension of existing exception reporting mechanisms we have. The
 * exception_triage calls will try to deliver the first round of exceptions allowing
 * task/debugger/ReportCrash/launchd level exception handlers to  respond to exception. If even after
 * notification the exception is not handled, then the process begins the death operations and during
 * proc_prepareexit, we decide to create a corpse for inspection. Following is a sample run through
 * of events and data shuffling that happens when corpses is enabled.
 *
 *   * a process causes an exception during normal execution of threads.
 *   * The exception generated by either mach(e.g GUARDED_MARCHPORT) or bsd(eg SIGABORT, GUARDED_FD
 *     etc) side is passed through the exception_triage() function to follow the thread -> task -> host
 *     level exception handling system. This set of steps are same as before and allow for existing
 *     crash reporting systems (both internal and 3rd party) to catch and create reports as required.
 *   * If above exception handling returns failed (when nobody handles the notification), then the
 *     proc_prepareexit path has logic to decide to create corpse.
 *   * The task_mark_corpse function allocates userspace vm memory and attaches the information
 *     kcdata_descriptor_t to task->corpse_info field of task.
 *     - All the task's threads are marked with the "inspection" flag which signals the termination
 *       daemon to not reap them but hold until they are being inspected.
 *     - task flags t_flags reflect the corpse bit and also a PENDING_CORPSE bit. PENDING_CORPSE
 *       prevents task_terminate from stripping important data from task.
 *     - It marks all the threads to terminate and return to AST for termination.
 *     - The allocation logic takes into account the rate limiting policy of allowing only
 *       TOTAL_CORPSES_ALLOWED in flight.
 *   * The proc exit threads continues and collects required information in the allocated vm region.
 *     Once complete it marks itself for termination.
 *   * In the thread_terminate_self(), the last thread to enter will do a call to proc_exit().
 *     Following this is a check to see if task is marked for corpse notification and will
 *     invoke the the task_deliver_crash_notification().
 *   * Once EXC_CORPSE_NOTIFY is delivered, it removes the PENDING_CORPSE flag from task (and
 *     inspection flag from all its threads) and allows task_terminate to go ahead and continue
 *     the mach task termination process.
 *   * ASIDE: The rest of the threads that are reaching the thread_terminate_daemon() with the
 *     inspection flag set are just bounced to another holding queue (crashed_threads_queue).
 *     Only after the corpse notification these are pulled out from holding queue and enqueued
 *     back to termination queue
 *
 *
 * Corpse info format
 * ==================
 * The kernel (task_mark_corpse()) makes a vm allocation in the dead task's vm space (with tag
 *     VM_MEMORY_CORPSEINFO (80)). Within this memory all corpse information is saved by various
 *     subsystems like
 *   * bsd proc exit path may write down pid, parent pid, number of file descriptors etc
 *   * mach side may append data regarding ledger usage, memory stats etc
 * See detailed info about the memory structure and format in kern_cdata.h documentation.
 *
 * Configuring Corpses functionality
 * =================================
 *   boot-arg: -no_corpses disables the corpse generation. This can be added/removed without affecting
 *     any other subsystem.
 *   TOTAL_CORPSES_ALLOWED : (recompilation required) - Changing this number allows for controlling
 *     the number of corpse instances to be held for inspection before allowing memory to be reclaimed
 *     by system.
 *   CORPSEINFO_ALLOCATION_SIZE: is the default size of vm allocation. If in future there is much more
 *     data to be put in, then please re-tune this parameter.
 *
 * Debugging/Visibility
 * ====================
 *   * lldbmacros for thread and task summary are updated to show "C" flag for corpse task/threads.
 *   * there are macros to see list of threads in termination queue (dumpthread_terminate_queue)
 *     and holding queue (dumpcrashed_thread_queue).
 *   * In case of corpse creation is disabled of ignored then the system log is updated with
 *     printf data with reason.
 *
 * Limitations of Corpses
 * ======================
 *   With holding off memory for inspection, it creates vm pressure which might not be desirable
 *   on low memory devices. There are limits to max corpses being inspected at a time which is
 *   marked by TOTAL_CORPSES_ALLOWED.
 *
 */


#include <stdatomic.h>
#include <kern/assert.h>
#include <mach/mach_types.h>
#include <mach/boolean.h>
#include <mach/vm_param.h>
#include <kern/kern_types.h>
#include <kern/mach_param.h>
#include <kern/thread.h>
#include <kern/task.h>
#include <corpses/task_corpse.h>
#include <kern/kalloc.h>
#include <kern/kern_cdata.h>
#include <mach/mach_vm.h>
#include <kern/exc_guard.h>

#if CONFIG_MACF
#include <security/mac_mach_internal.h>
#endif

/*
 * Exported interfaces
 */
#include <mach/task_server.h>

union corpse_creation_gate {
        struct {
                uint16_t user_faults;
                uint16_t corpses;
        };
        uint32_t value;
};

static _Atomic uint32_t inflight_corpses;
unsigned long  total_corpses_created = 0;
boolean_t corpse_enabled_config = TRUE;

/* bootarg to turn on corpse forking for EXC_RESOURCE */
int exc_via_corpse_forking = 1;

/* bootarg to generate corpse for fatal high memory watermark violation */
int corpse_for_fatal_memkill = 1;

#ifdef  __arm__
static inline int
IS_64BIT_PROCESS(__unused void *p)
{
        return 0;
}
#else
extern int IS_64BIT_PROCESS(void *);
#endif /* __arm__ */
extern void gather_populate_corpse_crashinfo(void *p, task_t task,
    mach_exception_data_type_t code, mach_exception_data_type_t subcode,
    uint64_t *udata_buffer, int num_udata, void *reason);
extern void *proc_find(int pid);
extern int proc_rele(void *p);


void
corpses_init()
{
        char temp_buf[20];
        int exc_corpse_forking;
        int fatal_memkill;
        if (PE_parse_boot_argn("-no_corpses", temp_buf, sizeof(temp_buf))) {
                corpse_enabled_config = FALSE;
        }
        if (PE_parse_boot_argn("exc_via_corpse_forking", &exc_corpse_forking, sizeof(exc_corpse_forking))) {
                exc_via_corpse_forking = exc_corpse_forking;
        }
        if (PE_parse_boot_argn("corpse_for_fatal_memkill", &fatal_memkill, sizeof(fatal_memkill))) {
                corpse_for_fatal_memkill = fatal_memkill;
        }
}

/*
 * Routine: corpses_enabled
 * returns FALSE if not enabled
 */
boolean_t
corpses_enabled()
{
        return corpse_enabled_config;
}

unsigned long
total_corpses_count(void)
{
        union corpse_creation_gate gate;

        gate.value = atomic_load_explicit(&inflight_corpses, memory_order_relaxed);
        return gate.corpses;
}

/*
 * Routine: task_crashinfo_get_ref()
 *          Grab a slot at creating a corpse.
 * Returns: KERN_SUCCESS if the policy allows for creating a corpse.
 */
static kern_return_t
task_crashinfo_get_ref(uint16_t kcd_u_flags)
{
        union corpse_creation_gate oldgate, newgate;

        assert(kcd_u_flags & CORPSE_CRASHINFO_HAS_REF);

        oldgate.value = atomic_load_explicit(&inflight_corpses, memory_order_relaxed);
        for (;;) {
                newgate = oldgate;
                if (kcd_u_flags & CORPSE_CRASHINFO_USER_FAULT) {
                        if (newgate.user_faults++ >= TOTAL_USER_FAULTS_ALLOWED) {
                                return KERN_RESOURCE_SHORTAGE;
                        }
                }
                if (newgate.corpses++ >= TOTAL_CORPSES_ALLOWED) {
                        return KERN_RESOURCE_SHORTAGE;
                }

                // this reloads the value in oldgate
                if (atomic_compare_exchange_strong_explicit(&inflight_corpses,
                    &oldgate.value, newgate.value, memory_order_relaxed,
                    memory_order_relaxed)) {
                        return KERN_SUCCESS;
                }
        }
}

/*
 * Routine: task_crashinfo_release_ref
 *          release the slot for corpse being used.
 */
static kern_return_t
task_crashinfo_release_ref(uint16_t kcd_u_flags)
{
        union corpse_creation_gate oldgate, newgate;

        assert(kcd_u_flags & CORPSE_CRASHINFO_HAS_REF);

        oldgate.value = atomic_load_explicit(&inflight_corpses, memory_order_relaxed);
        for (;;) {
                newgate = oldgate;
                if (kcd_u_flags & CORPSE_CRASHINFO_USER_FAULT) {
                        if (newgate.user_faults-- == 0) {
                                panic("corpse in flight count over-release");
                        }
                }
                if (newgate.corpses-- == 0) {
                        panic("corpse in flight count over-release");
                }
                // this reloads the value in oldgate
                if (atomic_compare_exchange_strong_explicit(&inflight_corpses,
                    &oldgate.value, newgate.value, memory_order_relaxed,
                    memory_order_relaxed)) {
                        return KERN_SUCCESS;
                }
        }
}


kcdata_descriptor_t
task_crashinfo_alloc_init(mach_vm_address_t crash_data_p, unsigned size,
    uint32_t kc_u_flags, unsigned kc_flags)
{
        kcdata_descriptor_t kcdata;

        if (kc_u_flags & CORPSE_CRASHINFO_HAS_REF) {
                if (KERN_SUCCESS != task_crashinfo_get_ref(kc_u_flags)) {
                        return NULL;
                }
        }

        kcdata = kcdata_memory_alloc_init(crash_data_p, TASK_CRASHINFO_BEGIN, size,
            kc_flags);
        if (kcdata) {
                kcdata->kcd_user_flags = kc_u_flags;
        } else if (kc_u_flags & CORPSE_CRASHINFO_HAS_REF) {
                task_crashinfo_release_ref(kc_u_flags);
        }
        return kcdata;
}


/*
 * Free up the memory associated with task_crashinfo_data
 */
kern_return_t
task_crashinfo_destroy(kcdata_descriptor_t data)
{
        if (!data) {
                return KERN_INVALID_ARGUMENT;
        }
        if (data->kcd_user_flags & CORPSE_CRASHINFO_HAS_REF) {
                task_crashinfo_release_ref(data->kcd_user_flags);
        }
        return kcdata_memory_destroy(data);
}

/*
 * Routine: task_get_corpseinfo
 * params: task - task which has corpse info setup.
 * returns: crash info data attached to task.
 *          NULL if task is null or has no corpse info
 */
kcdata_descriptor_t
task_get_corpseinfo(task_t task)
{
        kcdata_descriptor_t retval = NULL;
        if (task != NULL) {
                retval = task->corpse_info;
        }
        return retval;
}

/*
 * Routine: task_add_to_corpse_task_list
 * params: task - task to be added to corpse task list
 * returns: None.
 */
void
task_add_to_corpse_task_list(task_t corpse_task)
{
        lck_mtx_lock(&tasks_corpse_lock);
        queue_enter(&corpse_tasks, corpse_task, task_t, corpse_tasks);
        lck_mtx_unlock(&tasks_corpse_lock);
}

/*
 * Routine: task_remove_from_corpse_task_list
 * params: task - task to be removed from corpse task list
 * returns: None.
 */
void
task_remove_from_corpse_task_list(task_t corpse_task)
{
        lck_mtx_lock(&tasks_corpse_lock);
        queue_remove(&corpse_tasks, corpse_task, task_t, corpse_tasks);
        lck_mtx_unlock(&tasks_corpse_lock);
}

/*
 * Routine: task_purge_all_corpses
 * params: None.
 * returns: None.
 */
void
task_purge_all_corpses(void)
{
        task_t task;

        printf("Purging corpses......\n\n");

        lck_mtx_lock(&tasks_corpse_lock);
        /* Iterate through all the corpse tasks and clear all map entries */
        queue_iterate(&corpse_tasks, task, task_t, corpse_tasks) {
                vm_map_remove(task->map,
                    task->map->min_offset,
                    task->map->max_offset,
                    /*
                     * Final cleanup:
                     * + no unnesting
                     * + remove immutable mappings
                     * + allow gaps in the range
                     */
                    (VM_MAP_REMOVE_NO_UNNESTING |
                    VM_MAP_REMOVE_IMMUTABLE |
                    VM_MAP_REMOVE_GAPS_OK));
        }

        lck_mtx_unlock(&tasks_corpse_lock);
}

/*
 * Routine: task_generate_corpse
 * params: task - task to fork a corpse
 *         corpse_task - task port of the generated corpse
 * returns: KERN_SUCCESS on Success.
 *          KERN_FAILURE on Failure.
 *          KERN_NOT_SUPPORTED on corpse disabled.
 *          KERN_RESOURCE_SHORTAGE on memory alloc failure or reaching max corpse.
 */
kern_return_t
task_generate_corpse(
        task_t task,
        ipc_port_t *corpse_task_port)
{
        task_t new_task;
        kern_return_t kr;
        thread_t thread, th_iter;
        ipc_port_t corpse_port;
        ipc_port_t old_notify;

        if (task == kernel_task || task == TASK_NULL) {
                return KERN_INVALID_ARGUMENT;
        }

        task_lock(task);
        if (task_is_a_corpse_fork(task)) {
                task_unlock(task);
                return KERN_INVALID_ARGUMENT;
        }
        task_unlock(task);

        /* Generate a corpse for the given task, will return with a ref on corpse task */
        kr = task_generate_corpse_internal(task, &new_task, &thread, 0, 0, 0, NULL);
        if (kr != KERN_SUCCESS) {
                return kr;
        }
        if (thread != THREAD_NULL) {
                thread_deallocate(thread);
        }

        /* wait for all the threads in the task to terminate */
        task_lock(new_task);
        task_wait_till_threads_terminate_locked(new_task);

        /* Reset thread ports of all the threads in task */
        queue_iterate(&new_task->threads, th_iter, thread_t, task_threads)
        {
                /* Do not reset the thread port for inactive threads */
                if (th_iter->corpse_dup == FALSE) {
                        ipc_thread_reset(th_iter);
                }
        }
        task_unlock(new_task);

        /* transfer the task ref to port and arm the no-senders notification */
        corpse_port = convert_task_to_port(new_task);
        assert(IP_NULL != corpse_port);

        ip_lock(corpse_port);
        require_ip_active(corpse_port);
        ipc_port_nsrequest(corpse_port, corpse_port->ip_mscount, ipc_port_make_sonce_locked(corpse_port), &old_notify);
        /* port unlocked */

        assert(IP_NULL == old_notify);
        *corpse_task_port = corpse_port;
        return KERN_SUCCESS;
}

/*
 * Routine: task_enqueue_exception_with_corpse
 * params: task - task to generate a corpse and enqueue it
 *         etype - EXC_RESOURCE or EXC_GUARD
 *         code - exception code to be enqueued
 *         codeCnt - code array count - code and subcode
 *
 * returns: KERN_SUCCESS on Success.
 *          KERN_FAILURE on Failure.
 *          KERN_INVALID_ARGUMENT on invalid arguments passed.
 *          KERN_NOT_SUPPORTED on corpse disabled.
 *          KERN_RESOURCE_SHORTAGE on memory alloc failure or reaching max corpse.
 */
kern_return_t
task_enqueue_exception_with_corpse(
        task_t task,
        exception_type_t etype,
        mach_exception_data_t code,
        mach_msg_type_number_t codeCnt,
        void *reason)
{
        task_t new_task = TASK_NULL;
        thread_t thread = THREAD_NULL;
        kern_return_t kr;

        if (codeCnt < 2) {
                return KERN_INVALID_ARGUMENT;
        }

        /* Generate a corpse for the given task, will return with a ref on corpse task */
        kr = task_generate_corpse_internal(task, &new_task, &thread,
            etype, code[0], code[1], reason);
        if (kr == KERN_SUCCESS) {
                if (thread == THREAD_NULL) {
                        return KERN_FAILURE;
                }
                assert(new_task != TASK_NULL);
                assert(etype == EXC_RESOURCE || etype == EXC_GUARD);
                thread_exception_enqueue(new_task, thread, etype);
        }
        return kr;
}

/*
 * Routine: task_generate_corpse_internal
 * params: task - task to fork a corpse
 *         corpse_task - task of the generated corpse
 *         exc_thread - equivalent thread in corpse enqueuing exception
 *         etype - EXC_RESOURCE or EXC_GUARD or 0
 *         code - mach exception code to be passed in corpse blob
 *         subcode - mach exception subcode to be passed in corpse blob
 * returns: KERN_SUCCESS on Success.
 *          KERN_FAILURE on Failure.
 *          KERN_NOT_SUPPORTED on corpse disabled.
 *          KERN_RESOURCE_SHORTAGE on memory alloc failure or reaching max corpse.
 */
kern_return_t
task_generate_corpse_internal(
        task_t task,
        task_t *corpse_task,
        thread_t *exc_thread,
        exception_type_t etype,
        mach_exception_data_type_t code,
        mach_exception_data_type_t subcode,
        void *reason)
{
        task_t new_task = TASK_NULL;
        thread_t thread = THREAD_NULL;
        thread_t thread_next = THREAD_NULL;
        kern_return_t kr;
        struct proc *p = NULL;
        int is_64bit_addr;
        int is_64bit_data;
        int t_flags;
        uint64_t *udata_buffer = NULL;
        int size = 0;
        int num_udata = 0;
        uint16_t kc_u_flags = CORPSE_CRASHINFO_HAS_REF;

#if CONFIG_MACF
        struct label *label = NULL;
#endif

        if (!corpses_enabled()) {
                return KERN_NOT_SUPPORTED;
        }

        if (etype == EXC_GUARD && EXC_GUARD_DECODE_GUARD_TYPE(code) == GUARD_TYPE_USER) {
                kc_u_flags |= CORPSE_CRASHINFO_USER_FAULT;
        }

        kr = task_crashinfo_get_ref(kc_u_flags);
        if (kr != KERN_SUCCESS) {
                return kr;
        }

        /* Having a task reference does not guarantee a proc reference */
        p = proc_find(task_pid(task));
        if (p == NULL) {
                kr = KERN_INVALID_TASK;
                goto error_task_generate_corpse;
        }

        is_64bit_addr = IS_64BIT_PROCESS(p);
        is_64bit_data = (task == TASK_NULL) ? is_64bit_addr : task_get_64bit_data(task);
        t_flags = TF_CORPSE_FORK |
            TF_PENDING_CORPSE |
            TF_CORPSE |
            (is_64bit_addr ? TF_64B_ADDR : TF_NONE) |
            (is_64bit_data ? TF_64B_DATA : TF_NONE);

#if CONFIG_MACF
        /* Create the corpse label credentials from the process. */
        label = mac_exc_create_label_for_proc(p);
#endif

        /* Create a task for corpse */
        kr = task_create_internal(task,
            NULL,
            TRUE,
            is_64bit_addr,
            is_64bit_data,
            t_flags,
            TPF_NONE,
            TWF_NONE,
            &new_task);
        if (kr != KERN_SUCCESS) {
                goto error_task_generate_corpse;
        }

        /* Create and copy threads from task, returns a ref to thread */
        kr = task_duplicate_map_and_threads(task, p, new_task, &thread,
            &udata_buffer, &size, &num_udata);
        if (kr != KERN_SUCCESS) {
                goto error_task_generate_corpse;
        }

        kr = task_collect_crash_info(new_task,
#if CONFIG_MACF
            label,
#endif
            TRUE);
        if (kr != KERN_SUCCESS) {
                goto error_task_generate_corpse;
        }

        /* transfer our references to the corpse info */
        assert(new_task->corpse_info->kcd_user_flags == 0);
        new_task->corpse_info->kcd_user_flags = kc_u_flags;
        kc_u_flags = 0;

        kr = task_start_halt(new_task);
        if (kr != KERN_SUCCESS) {
                goto error_task_generate_corpse;
        }

        /* terminate the ipc space */
        ipc_space_terminate(new_task->itk_space);

        /* Populate the corpse blob, use the proc struct of task instead of corpse task */
        gather_populate_corpse_crashinfo(p, new_task,
            code, subcode, udata_buffer, num_udata, reason);

        /* Add it to global corpse task list */
        task_add_to_corpse_task_list(new_task);

        *corpse_task = new_task;
        *exc_thread = thread;

error_task_generate_corpse:
#if CONFIG_MACF
        if (label) {
                mac_exc_free_label(label);
        }
#endif

        /* Release the proc reference */
        if (p != NULL) {
                proc_rele(p);
        }

        if (kr != KERN_SUCCESS) {
                if (thread != THREAD_NULL) {
                        thread_deallocate(thread);
                }
                if (new_task != TASK_NULL) {
                        task_lock(new_task);
                        /* Terminate all the other threads in the task. */
                        queue_iterate(&new_task->threads, thread_next, thread_t, task_threads)
                        {
                                thread_terminate_internal(thread_next);
                        }
                        /* wait for all the threads in the task to terminate */
                        task_wait_till_threads_terminate_locked(new_task);
                        task_unlock(new_task);

                        task_clear_corpse(new_task);
                        task_terminate_internal(new_task);
                        task_deallocate(new_task);
                }
                if (kc_u_flags) {
                        task_crashinfo_release_ref(kc_u_flags);
                }
        }
        /* Free the udata buffer allocated in task_duplicate_map_and_threads */
        if (udata_buffer != NULL) {
                kfree(udata_buffer, size);
        }

        return kr;
}

/*
 * Routine: task_map_corpse_info
 * params: task - Map the corpse info in task's address space
 *         corpse_task - task port of the corpse
 *         kcd_addr_begin - address of the mapped corpse info
 *         kcd_addr_begin - size of the mapped corpse info
 * returns: KERN_SUCCESS on Success.
 *          KERN_FAILURE on Failure.
 *          KERN_INVALID_ARGUMENT on invalid arguments.
 * Note: Temporary function, will be deleted soon.
 */
kern_return_t
task_map_corpse_info(
        task_t task,
        task_t corpse_task,
        vm_address_t *kcd_addr_begin,
        uint32_t *kcd_size)
{
        kern_return_t kr;
        mach_vm_address_t kcd_addr_begin_64;
        mach_vm_size_t size_64;

        kr = task_map_corpse_info_64(task, corpse_task, &kcd_addr_begin_64, &size_64);
        if (kr != KERN_SUCCESS) {
                return kr;
        }

        *kcd_addr_begin = (vm_address_t)kcd_addr_begin_64;
        *kcd_size = (uint32_t) size_64;
        return KERN_SUCCESS;
}

/*
 * Routine: task_map_corpse_info_64
 * params: task - Map the corpse info in task's address space
 *         corpse_task - task port of the corpse
 *         kcd_addr_begin - address of the mapped corpse info (takes mach_vm_addess_t *)
 *         kcd_addr_begin - size of the mapped corpse info (takes mach_vm_size_t *)
 * returns: KERN_SUCCESS on Success.
 *          KERN_FAILURE on Failure.
 *          KERN_INVALID_ARGUMENT on invalid arguments.
 */
kern_return_t
task_map_corpse_info_64(
        task_t task,
        task_t corpse_task,
        mach_vm_address_t *kcd_addr_begin,
        mach_vm_size_t *kcd_size)
{
        kern_return_t kr;
        mach_vm_offset_t crash_data_ptr = 0;
        mach_vm_size_t size = CORPSEINFO_ALLOCATION_SIZE;
        void *corpse_info_kernel = NULL;

        if (task == TASK_NULL || task_is_a_corpse_fork(task)) {
                return KERN_INVALID_ARGUMENT;
        }

        if (corpse_task == TASK_NULL || !task_is_a_corpse(corpse_task) ||
            kcdata_memory_get_begin_addr(corpse_task->corpse_info) == NULL) {
                return KERN_INVALID_ARGUMENT;
        }
        corpse_info_kernel = kcdata_memory_get_begin_addr(corpse_task->corpse_info);
        kr = mach_vm_allocate_kernel(task->map, &crash_data_ptr, size,
            VM_FLAGS_ANYWHERE, VM_MEMORY_CORPSEINFO);
        if (kr != KERN_SUCCESS) {
                return kr;
        }
        copyout(corpse_info_kernel, crash_data_ptr, size);
        *kcd_addr_begin = crash_data_ptr;
        *kcd_size = size;

        return KERN_SUCCESS;
}

uint64_t
task_corpse_get_crashed_thread_id(task_t corpse_task)
{
        return corpse_task->crashed_thread_id;
}