xnu-2782.1.97.tar.gz

[apple/xnu.git] / bsd / vm / vm_unix.c

/*
 * Copyright (c) 2000-2010 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.
 * Please see the License for the specific language governing rights and
 * limitations under the License.
 * 
 * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
 */
/* 
 * Mach Operating System
 * Copyright (c) 1987 Carnegie-Mellon University
 * All rights reserved.  The CMU software License Agreement specifies
 * the terms and conditions for use and redistribution.
 */
/*
 * NOTICE: This file was modified by SPARTA, Inc. in 2006 to introduce
 * support for mandatory and extensible security protections.  This notice
 * is included in support of clause 2.2 (b) of the Apple Public License,
 * Version 2.0.
 */

#include <meta_features.h>

#include <vm/vm_options.h>

#include <kern/task.h>
#include <kern/thread.h>
#include <kern/debug.h>
#include <kern/extmod_statistics.h>
#include <mach/mach_traps.h>
#include <mach/port.h>
#include <mach/task.h>
#include <mach/task_access.h>
#include <mach/task_special_ports.h>
#include <mach/time_value.h>
#include <mach/vm_map.h>
#include <mach/vm_param.h>
#include <mach/vm_prot.h>

#include <sys/file_internal.h>
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/dir.h>
#include <sys/namei.h>
#include <sys/proc_internal.h>
#include <sys/kauth.h>
#include <sys/vm.h>
#include <sys/file.h>
#include <sys/vnode_internal.h>
#include <sys/mount.h>
#include <sys/trace.h>
#include <sys/kernel.h>
#include <sys/ubc_internal.h>
#include <sys/user.h>
#include <sys/syslog.h>
#include <sys/stat.h>
#include <sys/sysproto.h>
#include <sys/mman.h>
#include <sys/sysctl.h>
#include <sys/cprotect.h>
#include <sys/kpi_socket.h>
#include <sys/kas_info.h>
#include <sys/socket.h>
#include <sys/socketvar.h>

#include <security/audit/audit.h>
#include <security/mac.h>
#include <bsm/audit_kevents.h>

#include <kern/kalloc.h>
#include <vm/vm_map.h>
#include <vm/vm_kern.h>
#include <vm/vm_pageout.h>

#include <machine/spl.h>

#include <mach/shared_region.h>
#include <vm/vm_shared_region.h>

#include <vm/vm_protos.h>

#include <sys/kern_memorystatus.h>


int _shared_region_map_and_slide(struct proc*, int, unsigned int, struct shared_file_mapping_np*, uint32_t, user_addr_t, user_addr_t);
int shared_region_copyin_mappings(struct proc*, user_addr_t, unsigned int, struct shared_file_mapping_np *);

SYSCTL_INT(_vm, OID_AUTO, vm_do_collapse_compressor, CTLFLAG_RD | CTLFLAG_LOCKED, &vm_counters.do_collapse_compressor, 0, "");
SYSCTL_INT(_vm, OID_AUTO, vm_do_collapse_compressor_pages, CTLFLAG_RD | CTLFLAG_LOCKED, &vm_counters.do_collapse_compressor_pages, 0, "");
SYSCTL_INT(_vm, OID_AUTO, vm_do_collapse_terminate, CTLFLAG_RD | CTLFLAG_LOCKED, &vm_counters.do_collapse_terminate, 0, "");
SYSCTL_INT(_vm, OID_AUTO, vm_do_collapse_terminate_failure, CTLFLAG_RD | CTLFLAG_LOCKED, &vm_counters.do_collapse_terminate_failure, 0, "");
SYSCTL_INT(_vm, OID_AUTO, vm_should_cow_but_wired, CTLFLAG_RD | CTLFLAG_LOCKED, &vm_counters.should_cow_but_wired, 0, "");
SYSCTL_INT(_vm, OID_AUTO, vm_create_upl_extra_cow, CTLFLAG_RD | CTLFLAG_LOCKED, &vm_counters.create_upl_extra_cow, 0, "");
SYSCTL_INT(_vm, OID_AUTO, vm_create_upl_extra_cow_pages, CTLFLAG_RD | CTLFLAG_LOCKED, &vm_counters.create_upl_extra_cow_pages, 0, "");
SYSCTL_INT(_vm, OID_AUTO, vm_create_upl_lookup_failure_write, CTLFLAG_RD | CTLFLAG_LOCKED, &vm_counters.create_upl_lookup_failure_write, 0, "");
SYSCTL_INT(_vm, OID_AUTO, vm_create_upl_lookup_failure_copy, CTLFLAG_RD | CTLFLAG_LOCKED, &vm_counters.create_upl_lookup_failure_copy, 0, "");
#if VM_SCAN_FOR_SHADOW_CHAIN
static int vm_shadow_max_enabled = 0;    /* Disabled by default */
extern int proc_shadow_max(void);
static int
vm_shadow_max SYSCTL_HANDLER_ARGS
{
#pragma unused(arg1, arg2, oidp)
        int value = 0;

        if (vm_shadow_max_enabled)
                value = proc_shadow_max();

        return SYSCTL_OUT(req, &value, sizeof(value));
}
SYSCTL_PROC(_vm, OID_AUTO, vm_shadow_max, CTLTYPE_INT|CTLFLAG_RD|CTLFLAG_LOCKED,
    0, 0, &vm_shadow_max, "I", "");

SYSCTL_INT(_vm, OID_AUTO, vm_shadow_max_enabled, CTLFLAG_RW | CTLFLAG_LOCKED, &vm_shadow_max_enabled, 0, "");

#endif /* VM_SCAN_FOR_SHADOW_CHAIN */

SYSCTL_INT(_vm, OID_AUTO, vm_debug_events, CTLFLAG_RW | CTLFLAG_LOCKED, &vm_debug_events, 0, "");

__attribute__((noinline)) int __KERNEL_WAITING_ON_TASKGATED_CHECK_ACCESS_UPCALL__(
        mach_port_t task_access_port, int32_t calling_pid, uint32_t calling_gid, int32_t target_pid);
/*
 * Sysctl's related to data/stack execution.  See osfmk/vm/vm_map.c
 */

#ifndef SECURE_KERNEL
extern int allow_stack_exec, allow_data_exec;

SYSCTL_INT(_vm, OID_AUTO, allow_stack_exec, CTLFLAG_RW | CTLFLAG_LOCKED, &allow_stack_exec, 0, "");
SYSCTL_INT(_vm, OID_AUTO, allow_data_exec, CTLFLAG_RW | CTLFLAG_LOCKED, &allow_data_exec, 0, "");
#endif /* !SECURE_KERNEL */

static const char *prot_values[] = {
        "none",
        "read-only",
        "write-only",
        "read-write",
        "execute-only",
        "read-execute",
        "write-execute",
        "read-write-execute"
};

void
log_stack_execution_failure(addr64_t vaddr, vm_prot_t prot)
{
        printf("Data/Stack execution not permitted: %s[pid %d] at virtual address 0x%qx, protections were %s\n", 
                current_proc()->p_comm, current_proc()->p_pid, vaddr, prot_values[prot & VM_PROT_ALL]);
}

int shared_region_unnest_logging = 1;

SYSCTL_INT(_vm, OID_AUTO, shared_region_unnest_logging, CTLFLAG_RW | CTLFLAG_LOCKED,
           &shared_region_unnest_logging, 0, "");

int vm_shared_region_unnest_log_interval = 10;
int shared_region_unnest_log_count_threshold = 5;

/*
 * Shared cache path enforcement.
 */

static int scdir_enforce = 1;
static char scdir_path[] = "/var/db/dyld/";

#ifndef SECURE_KERNEL
SYSCTL_INT(_vm, OID_AUTO, enforce_shared_cache_dir, CTLFLAG_RW | CTLFLAG_LOCKED, &scdir_enforce, 0, "");
#endif

/* These log rate throttling state variables aren't thread safe, but
 * are sufficient unto the task.
 */
static int64_t last_unnest_log_time = 0; 
static int shared_region_unnest_log_count = 0;

void log_unnest_badness(vm_map_t m, vm_map_offset_t s, vm_map_offset_t e) {
        struct timeval tv;
        const char *pcommstr;

        if (shared_region_unnest_logging == 0)
                return;

        if (shared_region_unnest_logging == 1) {
                microtime(&tv);
                if ((tv.tv_sec - last_unnest_log_time) < vm_shared_region_unnest_log_interval) {
                        if (shared_region_unnest_log_count++ > shared_region_unnest_log_count_threshold)
                                return;
                }
                else {
                        last_unnest_log_time = tv.tv_sec;
                        shared_region_unnest_log_count = 0;
                }
        }

        pcommstr = current_proc()->p_comm;

        printf("%s (map: %p) triggered DYLD shared region unnest for map: %p, region 0x%qx->0x%qx. While not abnormal for debuggers, this increases system memory footprint until the target exits.\n", current_proc()->p_comm, get_task_map(current_proc()->task), m, (uint64_t)s, (uint64_t)e);
}

int
useracc(
        user_addr_t     addr,
        user_size_t     len,
        int     prot)
{
        vm_map_t        map;

        map = current_map();
        return (vm_map_check_protection(
                        map,
                        vm_map_trunc_page(addr,
                                          vm_map_page_mask(map)),
                        vm_map_round_page(addr+len,
                                          vm_map_page_mask(map)),
                        prot == B_READ ? VM_PROT_READ : VM_PROT_WRITE));
}

int
vslock(
        user_addr_t     addr,
        user_size_t     len)
{
        kern_return_t   kret;
        vm_map_t        map;

        map = current_map();
        kret = vm_map_wire(map,
                           vm_map_trunc_page(addr,
                                             vm_map_page_mask(map)),
                           vm_map_round_page(addr+len,
                                             vm_map_page_mask(map)), 
                           VM_PROT_READ | VM_PROT_WRITE,
                           FALSE);

        switch (kret) {
        case KERN_SUCCESS:
                return (0);
        case KERN_INVALID_ADDRESS:
        case KERN_NO_SPACE:
                return (ENOMEM);
        case KERN_PROTECTION_FAILURE:
                return (EACCES);
        default:
                return (EINVAL);
        }
}

int
vsunlock(
        user_addr_t addr,
        user_size_t len,
        __unused int dirtied)
{
#if FIXME  /* [ */
        pmap_t          pmap;
        vm_page_t       pg;
        vm_map_offset_t vaddr;
        ppnum_t         paddr;
#endif  /* FIXME ] */
        kern_return_t   kret;
        vm_map_t        map;

        map = current_map();

#if FIXME  /* [ */
        if (dirtied) {
                pmap = get_task_pmap(current_task());
                for (vaddr = vm_map_trunc_page(addr, PAGE_MASK);
                     vaddr < vm_map_round_page(addr+len, PAGE_MASK);
                     vaddr += PAGE_SIZE) {
                        paddr = pmap_extract(pmap, vaddr);
                        pg = PHYS_TO_VM_PAGE(paddr);
                        vm_page_set_modified(pg);
                }
        }
#endif  /* FIXME ] */
#ifdef  lint
        dirtied++;
#endif  /* lint */
        kret = vm_map_unwire(map,
                             vm_map_trunc_page(addr,
                                               vm_map_page_mask(map)),
                             vm_map_round_page(addr+len,
                                               vm_map_page_mask(map)),
                             FALSE);
        switch (kret) {
        case KERN_SUCCESS:
                return (0);
        case KERN_INVALID_ADDRESS:
        case KERN_NO_SPACE:
                return (ENOMEM);
        case KERN_PROTECTION_FAILURE:
                return (EACCES);
        default:
                return (EINVAL);
        }
}

int
subyte(
        user_addr_t addr,
        int byte)
{
        char character;
        
        character = (char)byte;
        return (copyout((void *)&(character), addr, sizeof(char)) == 0 ? 0 : -1);
}

int
suibyte(
        user_addr_t addr,
        int byte)
{
        char character;
        
        character = (char)byte;
        return (copyout((void *)&(character), addr, sizeof(char)) == 0 ? 0 : -1);
}

int fubyte(user_addr_t addr)
{
        unsigned char byte;

        if (copyin(addr, (void *) &byte, sizeof(char)))
                return(-1);
        return(byte);
}

int fuibyte(user_addr_t addr)
{
        unsigned char byte;

        if (copyin(addr, (void *) &(byte), sizeof(char)))
                return(-1);
        return(byte);
}

int
suword(
        user_addr_t addr,
        long word)
{
        return (copyout((void *) &word, addr, sizeof(int)) == 0 ? 0 : -1);
}

long fuword(user_addr_t addr)
{
        long word = 0;

        if (copyin(addr, (void *) &word, sizeof(int)))
                return(-1);
        return(word);
}

/* suiword and fuiword are the same as suword and fuword, respectively */

int
suiword(
        user_addr_t addr,
        long word)
{
        return (copyout((void *) &word, addr, sizeof(int)) == 0 ? 0 : -1);
}

long fuiword(user_addr_t addr)
{
        long word = 0;

        if (copyin(addr, (void *) &word, sizeof(int)))
                return(-1);
        return(word);
}

/*
 * With a 32-bit kernel and mixed 32/64-bit user tasks, this interface allows the
 * fetching and setting of process-sized size_t and pointer values.
 */
int
sulong(user_addr_t addr, int64_t word)
{

        if (IS_64BIT_PROCESS(current_proc())) {
                return(copyout((void *)&word, addr, sizeof(word)) == 0 ? 0 : -1);
        } else {
                return(suiword(addr, (long)word));
        }
}

int64_t
fulong(user_addr_t addr)
{
        int64_t longword;

        if (IS_64BIT_PROCESS(current_proc())) {
                if (copyin(addr, (void *)&longword, sizeof(longword)) != 0)
                        return(-1);
                return(longword);
        } else {
                return((int64_t)fuiword(addr));
        }
}

int
suulong(user_addr_t addr, uint64_t uword)
{

        if (IS_64BIT_PROCESS(current_proc())) {
                return(copyout((void *)&uword, addr, sizeof(uword)) == 0 ? 0 : -1);
        } else {
                return(suiword(addr, (uint32_t)uword));
        }
}

uint64_t
fuulong(user_addr_t addr)
{
        uint64_t ulongword;

        if (IS_64BIT_PROCESS(current_proc())) {
                if (copyin(addr, (void *)&ulongword, sizeof(ulongword)) != 0)
                        return(-1ULL);
                return(ulongword);
        } else {
                return((uint64_t)fuiword(addr));
        }
}

int
swapon(__unused proc_t procp, __unused struct swapon_args *uap, __unused int *retval)
{
        return(ENOTSUP);
}

/*
 * pid_for_task
 *
 * Find the BSD process ID for the Mach task associated with the given Mach port 
 * name
 *
 * Parameters:  args            User argument descriptor (see below)
 *
 * Indirect parameters: args->t         Mach port name
 *                      args->pid       Process ID (returned value; see below)
 *
 * Returns:     KERL_SUCCESS    Success
 *              KERN_FAILURE    Not success           
 *
 * Implicit returns: args->pid          Process ID
 *
 */
kern_return_t
pid_for_task(
        struct pid_for_task_args *args)
{
        mach_port_name_t        t = args->t;
        user_addr_t             pid_addr  = args->pid;  
        proc_t p;
        task_t          t1;
        int     pid = -1;
        kern_return_t   err = KERN_SUCCESS;

        AUDIT_MACH_SYSCALL_ENTER(AUE_PIDFORTASK);
        AUDIT_ARG(mach_port1, t);

        t1 = port_name_to_task(t);

        if (t1 == TASK_NULL) {
                err = KERN_FAILURE;
                goto pftout;
        } else {
                p = get_bsdtask_info(t1);
                if (p) {
                        pid  = proc_pid(p);
                        err = KERN_SUCCESS;
                } else {
                        err = KERN_FAILURE;
                }
        }
        task_deallocate(t1);
pftout:
        AUDIT_ARG(pid, pid);
        (void) copyout((char *) &pid, pid_addr, sizeof(int));
        AUDIT_MACH_SYSCALL_EXIT(err);
        return(err);
}

/* 
 *
 * tfp_policy = KERN_TFP_POLICY_DENY; Deny Mode: None allowed except for self
 * tfp_policy = KERN_TFP_POLICY_DEFAULT; default mode: all posix checks and upcall via task port for authentication
 *
 */
static  int tfp_policy = KERN_TFP_POLICY_DEFAULT;

/*
 *      Routine:        task_for_pid_posix_check
 *      Purpose:
 *                      Verify that the current process should be allowed to
 *                      get the target process's task port. This is only 
 *                      permitted if:
 *                      - The current process is root
 *                      OR all of the following are true:
 *                      - The target process's real, effective, and saved uids
 *                        are the same as the current proc's euid,
 *                      - The target process's group set is a subset of the
 *                        calling process's group set, and
 *                      - The target process hasn't switched credentials.
 *
 *      Returns:        TRUE: permitted
 *                      FALSE: denied
 */
static int
task_for_pid_posix_check(proc_t target)
{
        kauth_cred_t targetcred, mycred;
        uid_t myuid;
        int allowed; 

        /* No task_for_pid on bad targets */
        if (target->p_stat == SZOMB) {
                return FALSE;
        }

        mycred = kauth_cred_get();
        myuid = kauth_cred_getuid(mycred);

        /* If we're running as root, the check passes */
        if (kauth_cred_issuser(mycred))
                return TRUE;

        /* We're allowed to get our own task port */
        if (target == current_proc())
                return TRUE;

        /* 
         * Under DENY, only root can get another proc's task port,
         * so no more checks are needed.
         */
        if (tfp_policy == KERN_TFP_POLICY_DENY) { 
                return FALSE;
        }

        targetcred = kauth_cred_proc_ref(target);
        allowed = TRUE;

        /* Do target's ruid, euid, and saved uid match my euid? */
        if ((kauth_cred_getuid(targetcred) != myuid) || 
                        (kauth_cred_getruid(targetcred) != myuid) ||
                        (kauth_cred_getsvuid(targetcred) != myuid)) {
                allowed = FALSE;
                goto out;
        }

        /* Are target's groups a subset of my groups? */
        if (kauth_cred_gid_subset(targetcred, mycred, &allowed) ||
                        allowed == 0) {
                allowed = FALSE;
                goto out;
        }

        /* Has target switched credentials? */
        if (target->p_flag & P_SUGID) {
                allowed = FALSE;
                goto out;
        }
        
out:
        kauth_cred_unref(&targetcred);
        return allowed;
}

/*
 *      __KERNEL_WAITING_ON_TASKGATED_CHECK_ACCESS_UPCALL__
 *
 *      Description:    Waits for the user space daemon to respond to the request
 *                      we made. Function declared non inline to be visible in
 *                      stackshots and spindumps as well as debugging.
 */
__attribute__((noinline)) int __KERNEL_WAITING_ON_TASKGATED_CHECK_ACCESS_UPCALL__(
        mach_port_t task_access_port, int32_t calling_pid, uint32_t calling_gid, int32_t target_pid)
{
        return check_task_access(task_access_port, calling_pid, calling_gid, target_pid);
}

/*
 *      Routine:        task_for_pid
 *      Purpose:
 *              Get the task port for another "process", named by its
 *              process ID on the same host as "target_task".
 *
 *              Only permitted to privileged processes, or processes
 *              with the same user ID.
 *
 *              Note: if pid == 0, an error is return no matter who is calling.
 *
 * XXX This should be a BSD system call, not a Mach trap!!!
 */
kern_return_t
task_for_pid(
        struct task_for_pid_args *args)
{
        mach_port_name_t        target_tport = args->target_tport;
        int                     pid = args->pid;
        user_addr_t             task_addr = args->t;
        proc_t                  p = PROC_NULL;
        task_t                  t1 = TASK_NULL;
        mach_port_name_t        tret = MACH_PORT_NULL;
        ipc_port_t              tfpport;
        void * sright;
        int error = 0;

        AUDIT_MACH_SYSCALL_ENTER(AUE_TASKFORPID);
        AUDIT_ARG(pid, pid);
        AUDIT_ARG(mach_port1, target_tport);

        /* Always check if pid == 0 */
        if (pid == 0) {
                (void ) copyout((char *)&t1, task_addr, sizeof(mach_port_name_t));
                AUDIT_MACH_SYSCALL_EXIT(KERN_FAILURE);
                return(KERN_FAILURE);
        }

        t1 = port_name_to_task(target_tport);
        if (t1 == TASK_NULL) {
                (void) copyout((char *)&t1, task_addr, sizeof(mach_port_name_t));
                AUDIT_MACH_SYSCALL_EXIT(KERN_FAILURE);
                return(KERN_FAILURE);
        } 


        p = proc_find(pid);
        if (p == PROC_NULL) {
                error = KERN_FAILURE;
                goto tfpout;
        }

#if CONFIG_AUDIT
        AUDIT_ARG(process, p);
#endif

        if (!(task_for_pid_posix_check(p))) {
                error = KERN_FAILURE;
                goto tfpout;
        }

        if (p->task != TASK_NULL) {
                /* If we aren't root and target's task access port is set... */
                if (!kauth_cred_issuser(kauth_cred_get()) &&
                        p != current_proc() &&
                        (task_get_task_access_port(p->task, &tfpport) == 0) &&
                        (tfpport != IPC_PORT_NULL)) {

                        if (tfpport == IPC_PORT_DEAD) {
                                error = KERN_PROTECTION_FAILURE;
                                goto tfpout;
                        }

                        /* Call up to the task access server */
                        error = __KERNEL_WAITING_ON_TASKGATED_CHECK_ACCESS_UPCALL__(tfpport, proc_selfpid(), kauth_getgid(), pid);

                        if (error != MACH_MSG_SUCCESS) {
                                if (error == MACH_RCV_INTERRUPTED)
                                        error = KERN_ABORTED;
                                else
                                        error = KERN_FAILURE;
                                goto tfpout;
                        }
                }
#if CONFIG_MACF
                error = mac_proc_check_get_task(kauth_cred_get(), p);
                if (error) {
                        error = KERN_FAILURE;
                        goto tfpout;
                }
#endif

                /* Grant task port access */
                task_reference(p->task);
                extmod_statistics_incr_task_for_pid(p->task);

                sright = (void *) convert_task_to_port(p->task);
                tret = ipc_port_copyout_send(
                                sright, 
                                get_task_ipcspace(current_task()));
        } 
        error = KERN_SUCCESS;

tfpout:
        task_deallocate(t1);
        AUDIT_ARG(mach_port2, tret);
        (void) copyout((char *) &tret, task_addr, sizeof(mach_port_name_t));
        if (p != PROC_NULL)
                proc_rele(p);
        AUDIT_MACH_SYSCALL_EXIT(error);
        return(error);
}

/*
 *      Routine:        task_name_for_pid
 *      Purpose:
 *              Get the task name port for another "process", named by its
 *              process ID on the same host as "target_task".
 *
 *              Only permitted to privileged processes, or processes
 *              with the same user ID.
 *
 * XXX This should be a BSD system call, not a Mach trap!!!
 */

kern_return_t
task_name_for_pid(
        struct task_name_for_pid_args *args)
{
        mach_port_name_t        target_tport = args->target_tport;
        int                     pid = args->pid;
        user_addr_t             task_addr = args->t;
        proc_t          p = PROC_NULL;
        task_t          t1;
        mach_port_name_t        tret;
        void * sright;
        int error = 0, refheld = 0;
        kauth_cred_t target_cred;

        AUDIT_MACH_SYSCALL_ENTER(AUE_TASKNAMEFORPID);
        AUDIT_ARG(pid, pid);
        AUDIT_ARG(mach_port1, target_tport);

        t1 = port_name_to_task(target_tport);
        if (t1 == TASK_NULL) {
                (void) copyout((char *)&t1, task_addr, sizeof(mach_port_name_t));
                AUDIT_MACH_SYSCALL_EXIT(KERN_FAILURE);
                return(KERN_FAILURE);
        } 

        p = proc_find(pid);
        if (p != PROC_NULL) {
                AUDIT_ARG(process, p);
                target_cred = kauth_cred_proc_ref(p);
                refheld = 1;

                if ((p->p_stat != SZOMB)
                    && ((current_proc() == p)
                        || kauth_cred_issuser(kauth_cred_get()) 
                        || ((kauth_cred_getuid(target_cred) == kauth_cred_getuid(kauth_cred_get())) && 
                            ((kauth_cred_getruid(target_cred) == kauth_getruid()))))) {

                        if (p->task != TASK_NULL) {
                                task_reference(p->task);
#if CONFIG_MACF
                                error = mac_proc_check_get_task_name(kauth_cred_get(),  p);
                                if (error) {
                                        task_deallocate(p->task);
                                        goto noperm;
                                }
#endif
                                sright = (void *)convert_task_name_to_port(p->task);
                                tret = ipc_port_copyout_send(sright, 
                                                get_task_ipcspace(current_task()));
                        } else
                                tret  = MACH_PORT_NULL;

                        AUDIT_ARG(mach_port2, tret);
                        (void) copyout((char *)&tret, task_addr, sizeof(mach_port_name_t));
                        task_deallocate(t1);
                        error = KERN_SUCCESS;
                        goto tnfpout;
                }
        }

#if CONFIG_MACF
noperm:
#endif
    task_deallocate(t1);
        tret = MACH_PORT_NULL;
        (void) copyout((char *) &tret, task_addr, sizeof(mach_port_name_t));
        error = KERN_FAILURE;
tnfpout:
        if (refheld != 0)
                kauth_cred_unref(&target_cred);
        if (p != PROC_NULL)
                proc_rele(p);
        AUDIT_MACH_SYSCALL_EXIT(error);
        return(error);
}

kern_return_t
pid_suspend(struct proc *p __unused, struct pid_suspend_args *args, int *ret)
{
        task_t  target = NULL;
        proc_t  targetproc = PROC_NULL;
        int     pid = args->pid;
        int     error = 0;

#if CONFIG_MACF
        error = mac_proc_check_suspend_resume(p, MAC_PROC_CHECK_SUSPEND);
        if (error) {
                error = EPERM;
                goto out;
        }
#endif

        if (pid == 0) {
                error = EPERM;
                goto out;
        }

        targetproc = proc_find(pid);
        if (targetproc == PROC_NULL) {
                error = ESRCH;
                goto out;
        }

        if (!task_for_pid_posix_check(targetproc)) {
                error = EPERM;
                goto out;
        }

        target = targetproc->task;
        if (target != TASK_NULL) {
                mach_port_t tfpport;

                /* If we aren't root and target's task access port is set... */
                if (!kauth_cred_issuser(kauth_cred_get()) &&
                        targetproc != current_proc() &&
                        (task_get_task_access_port(target, &tfpport) == 0) &&
                        (tfpport != IPC_PORT_NULL)) {

                        if (tfpport == IPC_PORT_DEAD) {
                                error = EACCES;
                                goto out;
                        }

                        /* Call up to the task access server */
                        error = __KERNEL_WAITING_ON_TASKGATED_CHECK_ACCESS_UPCALL__(tfpport, proc_selfpid(), kauth_getgid(), pid);

                        if (error != MACH_MSG_SUCCESS) {
                                if (error == MACH_RCV_INTERRUPTED)
                                        error = EINTR;
                                else
                                        error = EPERM;
                                goto out;
                        }
                }
        }

        task_reference(target);
        error = task_pidsuspend(target);
        if (error) {
                if (error == KERN_INVALID_ARGUMENT) {
                        error = EINVAL;
                } else {
                        error = EPERM;
                }
        }
#if CONFIG_MEMORYSTATUS
        else {
                memorystatus_on_suspend(targetproc);
        }
#endif

        task_deallocate(target);

out:
        if (targetproc != PROC_NULL)
                proc_rele(targetproc);
        *ret = error;
        return error;
}

kern_return_t
pid_resume(struct proc *p __unused, struct pid_resume_args *args, int *ret)
{
        task_t  target = NULL;
        proc_t  targetproc = PROC_NULL;
        int     pid = args->pid;
        int     error = 0;

#if CONFIG_MACF
        error = mac_proc_check_suspend_resume(p, MAC_PROC_CHECK_RESUME);
        if (error) {
                error = EPERM;
                goto out;
        }
#endif

        if (pid == 0) {
                error = EPERM;
                goto out;
        }

        targetproc = proc_find(pid);
        if (targetproc == PROC_NULL) {
                error = ESRCH;
                goto out;
        }

        if (!task_for_pid_posix_check(targetproc)) {
                error = EPERM;
                goto out;
        }

        target = targetproc->task;
        if (target != TASK_NULL) {
                mach_port_t tfpport;

                /* If we aren't root and target's task access port is set... */
                if (!kauth_cred_issuser(kauth_cred_get()) &&
                        targetproc != current_proc() &&
                        (task_get_task_access_port(target, &tfpport) == 0) &&
                        (tfpport != IPC_PORT_NULL)) {

                        if (tfpport == IPC_PORT_DEAD) {
                                error = EACCES;
                                goto out;
                        }

                        /* Call up to the task access server */
                        error = __KERNEL_WAITING_ON_TASKGATED_CHECK_ACCESS_UPCALL__(tfpport, proc_selfpid(), kauth_getgid(), pid);

                        if (error != MACH_MSG_SUCCESS) {
                                if (error == MACH_RCV_INTERRUPTED)
                                        error = EINTR;
                                else
                                        error = EPERM;
                                goto out;
                        }
                }
        }

        task_reference(target);

#if CONFIG_MEMORYSTATUS
        memorystatus_on_resume(targetproc);
#endif

        error = task_pidresume(target);
        if (error) {
                if (error == KERN_INVALID_ARGUMENT) {
                        error = EINVAL;
                } else {
                        if (error == KERN_MEMORY_ERROR) {
                                psignal(targetproc, SIGKILL);
                                error = EIO;
                        } else
                                error = EPERM;
                }
        }
        
        task_deallocate(target);

out:
        if (targetproc != PROC_NULL)
                proc_rele(targetproc);
        
        *ret = error;
        return error;
}


static int
sysctl_settfp_policy(__unused struct sysctl_oid *oidp, void *arg1,
    __unused int arg2, struct sysctl_req *req)
{
    int error = 0;
        int new_value;

    error = SYSCTL_OUT(req, arg1, sizeof(int));
    if (error || req->newptr == USER_ADDR_NULL)
        return(error);

        if (!kauth_cred_issuser(kauth_cred_get()))
                return(EPERM);

        if ((error = SYSCTL_IN(req, &new_value, sizeof(int)))) {
                goto out;
        }
        if ((new_value == KERN_TFP_POLICY_DENY) 
                || (new_value == KERN_TFP_POLICY_DEFAULT))
                        tfp_policy = new_value;
        else
                        error = EINVAL;         
out:
    return(error);

}

#if defined(SECURE_KERNEL)
static int kern_secure_kernel = 1;
#else
static int kern_secure_kernel = 0;
#endif

SYSCTL_INT(_kern, OID_AUTO, secure_kernel, CTLFLAG_RD | CTLFLAG_LOCKED, &kern_secure_kernel, 0, "");

SYSCTL_NODE(_kern, KERN_TFP, tfp, CTLFLAG_RW | CTLFLAG_LOCKED, 0, "tfp");
SYSCTL_PROC(_kern_tfp, KERN_TFP_POLICY, policy, CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_LOCKED,
    &tfp_policy, sizeof(uint32_t), &sysctl_settfp_policy ,"I","policy");

SYSCTL_INT(_vm, OID_AUTO, shared_region_trace_level, CTLFLAG_RW | CTLFLAG_LOCKED,
           &shared_region_trace_level, 0, "");
SYSCTL_INT(_vm, OID_AUTO, shared_region_version, CTLFLAG_RD | CTLFLAG_LOCKED,
           &shared_region_version, 0, "");
SYSCTL_INT(_vm, OID_AUTO, shared_region_persistence, CTLFLAG_RW | CTLFLAG_LOCKED,
           &shared_region_persistence, 0, "");

/*
 * shared_region_check_np:
 *
 * This system call is intended for dyld.
 *
 * dyld calls this when any process starts to see if the process's shared
 * region is already set up and ready to use.
 * This call returns the base address of the first mapping in the
 * process's shared region's first mapping.
 * dyld will then check what's mapped at that address.
 *
 * If the shared region is empty, dyld will then attempt to map the shared
 * cache file in the shared region via the shared_region_map_np() system call.
 *
 * If something's already mapped in the shared region, dyld will check if it
 * matches the shared cache it would like to use for that process.
 * If it matches, evrything's ready and the process can proceed and use the
 * shared region.
 * If it doesn't match, dyld will unmap the shared region and map the shared
 * cache into the process's address space via mmap().
 *
 * ERROR VALUES
 * EINVAL       no shared region
 * ENOMEM       shared region is empty
 * EFAULT       bad address for "start_address"
 */
int
shared_region_check_np(
        __unused struct proc                    *p,
        struct shared_region_check_np_args      *uap,
        __unused int                            *retvalp)
{
        vm_shared_region_t      shared_region;
        mach_vm_offset_t        start_address = 0;
        int                     error;
        kern_return_t           kr;

        SHARED_REGION_TRACE_DEBUG(
                ("shared_region: %p [%d(%s)] -> check_np(0x%llx)\n",
                 (void *)VM_KERNEL_ADDRPERM(current_thread()),
                 p->p_pid, p->p_comm,
                 (uint64_t)uap->start_address));

        /* retrieve the current tasks's shared region */
        shared_region = vm_shared_region_get(current_task());
        if (shared_region != NULL) {
                /* retrieve address of its first mapping... */
                kr = vm_shared_region_start_address(shared_region,
                                                    &start_address);
                if (kr != KERN_SUCCESS) {
                        error = ENOMEM;
                } else {
                        /* ... and give it to the caller */
                        error = copyout(&start_address,
                                        (user_addr_t) uap->start_address,
                                        sizeof (start_address));
                        if (error) {
                                SHARED_REGION_TRACE_ERROR(
                                        ("shared_region: %p [%d(%s)] "
                                         "check_np(0x%llx) "
                                         "copyout(0x%llx) error %d\n",
                                         (void *)VM_KERNEL_ADDRPERM(current_thread()),
                                         p->p_pid, p->p_comm,
                                         (uint64_t)uap->start_address, (uint64_t)start_address,
                                         error));
                        }
                }
                vm_shared_region_deallocate(shared_region);
        } else {
                /* no shared region ! */
                error = EINVAL;
        }

        SHARED_REGION_TRACE_DEBUG(
                ("shared_region: %p [%d(%s)] check_np(0x%llx) <- 0x%llx %d\n",
                 (void *)VM_KERNEL_ADDRPERM(current_thread()),
                 p->p_pid, p->p_comm,
                 (uint64_t)uap->start_address, (uint64_t)start_address, error));

        return error;
}


int
shared_region_copyin_mappings(
                struct proc                     *p,
                user_addr_t                     user_mappings,
                unsigned int                    mappings_count,
                struct shared_file_mapping_np   *mappings)
{
        int             error = 0;
        vm_size_t       mappings_size = 0;

        /* get the list of mappings the caller wants us to establish */
        mappings_size = (vm_size_t) (mappings_count * sizeof (mappings[0]));
        error = copyin(user_mappings,
                       mappings,
                       mappings_size);
        if (error) {
                SHARED_REGION_TRACE_ERROR(
                        ("shared_region: %p [%d(%s)] map(): "
                         "copyin(0x%llx, %d) failed (error=%d)\n",
                         (void *)VM_KERNEL_ADDRPERM(current_thread()),
                         p->p_pid, p->p_comm,
                         (uint64_t)user_mappings, mappings_count, error));
        }
        return error;
}
/*
 * shared_region_map_np()
 *
 * This system call is intended for dyld.
 *
 * dyld uses this to map a shared cache file into a shared region.
 * This is usually done only the first time a shared cache is needed.
 * Subsequent processes will just use the populated shared region without
 * requiring any further setup.
 */
int
_shared_region_map_and_slide(
        struct proc                             *p,
        int                                     fd,
        uint32_t                                mappings_count,
        struct shared_file_mapping_np           *mappings,
        uint32_t                                slide,
        user_addr_t                             slide_start,
        user_addr_t                             slide_size)
{
        int                             error;
        kern_return_t                   kr;
        struct fileproc                 *fp;
        struct vnode                    *vp, *root_vp, *scdir_vp;
        struct vnode_attr               va;
        off_t                           fs;
        memory_object_size_t            file_size;
#if CONFIG_MACF
        vm_prot_t                       maxprot = VM_PROT_ALL;
#endif
        memory_object_control_t         file_control;
        struct vm_shared_region         *shared_region;

        SHARED_REGION_TRACE_DEBUG(
                ("shared_region: %p [%d(%s)] -> map\n",
                 (void *)VM_KERNEL_ADDRPERM(current_thread()),
                 p->p_pid, p->p_comm));

        shared_region = NULL;
        fp = NULL;
        vp = NULL;
        scdir_vp = NULL;

        /* get file structure from file descriptor */
        error = fp_lookup(p, fd, &fp, 0);
        if (error) {
                SHARED_REGION_TRACE_ERROR(
                        ("shared_region: %p [%d(%s)] map: "
                         "fd=%d lookup failed (error=%d)\n",
                         (void *)VM_KERNEL_ADDRPERM(current_thread()),
                         p->p_pid, p->p_comm, fd, error));
                goto done;
        }

        /* make sure we're attempting to map a vnode */
        if (FILEGLOB_DTYPE(fp->f_fglob) != DTYPE_VNODE) {
                SHARED_REGION_TRACE_ERROR(
                        ("shared_region: %p [%d(%s)] map: "
                         "fd=%d not a vnode (type=%d)\n",
                         (void *)VM_KERNEL_ADDRPERM(current_thread()),
                         p->p_pid, p->p_comm,
                         fd, FILEGLOB_DTYPE(fp->f_fglob)));
                error = EINVAL;
                goto done;
        }

        /* we need at least read permission on the file */
        if (! (fp->f_fglob->fg_flag & FREAD)) {
                SHARED_REGION_TRACE_ERROR(
                        ("shared_region: %p [%d(%s)] map: "
                         "fd=%d not readable\n",
                         (void *)VM_KERNEL_ADDRPERM(current_thread()),
                         p->p_pid, p->p_comm, fd));
                error = EPERM;
                goto done;
        }

        /* get vnode from file structure */
        error = vnode_getwithref((vnode_t) fp->f_fglob->fg_data);
        if (error) {
                SHARED_REGION_TRACE_ERROR(
                        ("shared_region: %p [%d(%s)] map: "
                         "fd=%d getwithref failed (error=%d)\n",
                         (void *)VM_KERNEL_ADDRPERM(current_thread()),
                         p->p_pid, p->p_comm, fd, error));
                goto done;
        }
        vp = (struct vnode *) fp->f_fglob->fg_data;

        /* make sure the vnode is a regular file */
        if (vp->v_type != VREG) {
                SHARED_REGION_TRACE_ERROR(
                        ("shared_region: %p [%d(%s)] map(%p:'%s'): "
                         "not a file (type=%d)\n",
                         (void *)VM_KERNEL_ADDRPERM(current_thread()),
                         p->p_pid, p->p_comm,
                         (void *)VM_KERNEL_ADDRPERM(vp),
                         vp->v_name, vp->v_type));
                error = EINVAL;
                goto done;
        }

#if CONFIG_MACF
        error = mac_file_check_mmap(vfs_context_ucred(vfs_context_current()),
                        fp->f_fglob, VM_PROT_ALL, MAP_FILE, &maxprot);
        if (error) {
                goto done;
        }
#endif /* MAC */

#if CONFIG_PROTECT
        /* check for content protection access */
        {
                error = cp_handle_vnop(vp, CP_READ_ACCESS | CP_WRITE_ACCESS, 0);
                if (error) { 
                        goto done;
                }
        }
#endif /* CONFIG_PROTECT */

        /* make sure vnode is on the process's root volume */
        root_vp = p->p_fd->fd_rdir;
        if (root_vp == NULL) {
                root_vp = rootvnode;
        } else {
                /*
                 * Chroot-ed processes can't use the shared_region.
                 */
                error = EINVAL;
                goto done;
        }

        if (vp->v_mount != root_vp->v_mount) {
                SHARED_REGION_TRACE_ERROR(
                        ("shared_region: %p [%d(%s)] map(%p:'%s'): "
                         "not on process's root volume\n",
                         (void *)VM_KERNEL_ADDRPERM(current_thread()),
                         p->p_pid, p->p_comm,
                         (void *)VM_KERNEL_ADDRPERM(vp), vp->v_name));
                error = EPERM;
                goto done;
        }

        /* make sure vnode is owned by "root" */
        VATTR_INIT(&va);
        VATTR_WANTED(&va, va_uid);
        error = vnode_getattr(vp, &va, vfs_context_current());
        if (error) {
                SHARED_REGION_TRACE_ERROR(
                        ("shared_region: %p [%d(%s)] map(%p:'%s'): "
                         "vnode_getattr(%p) failed (error=%d)\n",
                         (void *)VM_KERNEL_ADDRPERM(current_thread()),
                         p->p_pid, p->p_comm,
                         (void *)VM_KERNEL_ADDRPERM(vp), vp->v_name,
                         (void *)VM_KERNEL_ADDRPERM(vp), error));
                goto done;
        }
        if (va.va_uid != 0) {
                SHARED_REGION_TRACE_ERROR(
                        ("shared_region: %p [%d(%s)] map(%p:'%s'): "
                         "owned by uid=%d instead of 0\n",
                         (void *)VM_KERNEL_ADDRPERM(current_thread()),
                         p->p_pid, p->p_comm,
                         (void *)VM_KERNEL_ADDRPERM(vp),
                         vp->v_name, va.va_uid));
                error = EPERM;
                goto done;
        }

        if (scdir_enforce) {
                /* get vnode for scdir_path */
                error = vnode_lookup(scdir_path, 0, &scdir_vp, vfs_context_current());
                if (error) {
                        SHARED_REGION_TRACE_ERROR(
                                ("shared_region: %p [%d(%s)] map(%p:'%s'): "
                                 "vnode_lookup(%s) failed (error=%d)\n",
                                 (void *)VM_KERNEL_ADDRPERM(current_thread()),
                                 p->p_pid, p->p_comm,
                                 (void *)VM_KERNEL_ADDRPERM(vp), vp->v_name,
                                 scdir_path, error));
                        goto done;
                }

                /* ensure parent is scdir_vp */
                if (vnode_parent(vp) != scdir_vp) {
                        SHARED_REGION_TRACE_ERROR(
                                ("shared_region: %p [%d(%s)] map(%p:'%s'): "
                                 "shared cache file not in %s\n",
                                 (void *)VM_KERNEL_ADDRPERM(current_thread()),
                                 p->p_pid, p->p_comm,
                                 (void *)VM_KERNEL_ADDRPERM(vp),
                                 vp->v_name, scdir_path));
                        error = EPERM;
                        goto done;
                }
        }

        /* get vnode size */
        error = vnode_size(vp, &fs, vfs_context_current());
        if (error) {
                SHARED_REGION_TRACE_ERROR(
                        ("shared_region: %p [%d(%s)] map(%p:'%s'): "
                         "vnode_size(%p) failed (error=%d)\n",
                         (void *)VM_KERNEL_ADDRPERM(current_thread()),
                         p->p_pid, p->p_comm,
                         (void *)VM_KERNEL_ADDRPERM(vp), vp->v_name,
                         (void *)VM_KERNEL_ADDRPERM(vp), error));
                goto done;
        }
        file_size = fs;

        /* get the file's memory object handle */
        file_control = ubc_getobject(vp, UBC_HOLDOBJECT);
        if (file_control == MEMORY_OBJECT_CONTROL_NULL) {
                SHARED_REGION_TRACE_ERROR(
                        ("shared_region: %p [%d(%s)] map(%p:'%s'): "
                         "no memory object\n",
                         (void *)VM_KERNEL_ADDRPERM(current_thread()),
                         p->p_pid, p->p_comm,
                         (void *)VM_KERNEL_ADDRPERM(vp), vp->v_name));
                error = EINVAL;
                goto done;
        }


        /* get the process's shared region (setup in vm_map_exec()) */
        shared_region = vm_shared_region_get(current_task());
        if (shared_region == NULL) {
                SHARED_REGION_TRACE_ERROR(
                        ("shared_region: %p [%d(%s)] map(%p:'%s'): "
                         "no shared region\n",
                         (void *)VM_KERNEL_ADDRPERM(current_thread()),
                         p->p_pid, p->p_comm,
                         (void *)VM_KERNEL_ADDRPERM(vp), vp->v_name));
                goto done;
        }

        /* map the file into that shared region's submap */
        kr = vm_shared_region_map_file(shared_region,
                                       mappings_count,
                                       mappings,
                                       file_control,
                                       file_size,
                                       (void *) p->p_fd->fd_rdir,
                                       slide,
                                       slide_start,
                                       slide_size);
        if (kr != KERN_SUCCESS) {
                SHARED_REGION_TRACE_ERROR(
                        ("shared_region: %p [%d(%s)] map(%p:'%s'): "
                         "vm_shared_region_map_file() failed kr=0x%x\n",
                         (void *)VM_KERNEL_ADDRPERM(current_thread()),
                         p->p_pid, p->p_comm,
                         (void *)VM_KERNEL_ADDRPERM(vp), vp->v_name, kr));
                switch (kr) {
                case KERN_INVALID_ADDRESS:
                        error = EFAULT;
                        break;
                case KERN_PROTECTION_FAILURE:
                        error = EPERM;
                        break;
                case KERN_NO_SPACE:
                        error = ENOMEM;
                        break;
                case KERN_FAILURE:
                case KERN_INVALID_ARGUMENT:
                default:
                        error = EINVAL;
                        break;
                }
                goto done;
        }

        error = 0;

        vnode_lock_spin(vp);

        vp->v_flag |= VSHARED_DYLD;

        vnode_unlock(vp);

        /* update the vnode's access time */
        if (! (vnode_vfsvisflags(vp) & MNT_NOATIME)) {
                VATTR_INIT(&va);
                nanotime(&va.va_access_time);
                VATTR_SET_ACTIVE(&va, va_access_time);
                vnode_setattr(vp, &va, vfs_context_current());
        }

        if (p->p_flag & P_NOSHLIB) {
                /* signal that this process is now using split libraries */
                OSBitAndAtomic(~((uint32_t)P_NOSHLIB), &p->p_flag);
        }

done:
        if (vp != NULL) {
                /*
                 * release the vnode...
                 * ubc_map() still holds it for us in the non-error case
                 */
                (void) vnode_put(vp);
                vp = NULL;
        }
        if (fp != NULL) {
                /* release the file descriptor */
                fp_drop(p, fd, fp, 0);
                fp = NULL;
        }
        if (scdir_vp != NULL) {
                (void)vnode_put(scdir_vp);
                scdir_vp = NULL;
        }

        if (shared_region != NULL) {
                vm_shared_region_deallocate(shared_region);
        }

        SHARED_REGION_TRACE_DEBUG(
                ("shared_region: %p [%d(%s)] <- map\n",
                 (void *)VM_KERNEL_ADDRPERM(current_thread()),
                 p->p_pid, p->p_comm));

        return error;
}

int
shared_region_map_and_slide_np(
        struct proc                             *p,
        struct shared_region_map_and_slide_np_args      *uap,
        __unused int                                    *retvalp)
{
        struct shared_file_mapping_np   *mappings;
        unsigned int                    mappings_count = uap->count;
        kern_return_t                   kr = KERN_SUCCESS;
        uint32_t                        slide = uap->slide;
        
#define SFM_MAX_STACK   8
        struct shared_file_mapping_np   stack_mappings[SFM_MAX_STACK];

        /* Is the process chrooted?? */
        if (p->p_fd->fd_rdir != NULL) {
                kr = EINVAL;
                goto done;
        }
                
        if ((kr = vm_shared_region_sliding_valid(slide)) != KERN_SUCCESS) {
                if (kr == KERN_INVALID_ARGUMENT) {
                        /*
                         * This will happen if we request sliding again 
                         * with the same slide value that was used earlier
                         * for the very first sliding.
                         */
                        kr = KERN_SUCCESS;
                }
                goto done;
        }

        if (mappings_count == 0) {
                SHARED_REGION_TRACE_INFO(
                        ("shared_region: %p [%d(%s)] map(): "
                         "no mappings\n",
                         (void *)VM_KERNEL_ADDRPERM(current_thread()),
                         p->p_pid, p->p_comm));
                kr = 0; /* no mappings: we're done ! */
                goto done;
        } else if (mappings_count <= SFM_MAX_STACK) {
                mappings = &stack_mappings[0];
        } else {
                SHARED_REGION_TRACE_ERROR(
                        ("shared_region: %p [%d(%s)] map(): "
                         "too many mappings (%d)\n",
                         (void *)VM_KERNEL_ADDRPERM(current_thread()),
                         p->p_pid, p->p_comm,
                         mappings_count));
                kr = KERN_FAILURE;
                goto done;
        }

        if ( (kr = shared_region_copyin_mappings(p, uap->mappings, uap->count, mappings))) {
                goto done;
        }


        kr = _shared_region_map_and_slide(p, uap->fd, mappings_count, mappings,
                                          slide,
                                          uap->slide_start, uap->slide_size);
        if (kr != KERN_SUCCESS) {
                return kr;
        }

done:
        return kr;
}

/* sysctl overflow room */

SYSCTL_INT (_vm, OID_AUTO, pagesize, CTLFLAG_RD | CTLFLAG_LOCKED,
            (int *) &page_size, 0, "vm page size");

/* vm_page_free_target is provided as a makeshift solution for applications that want to
        allocate buffer space, possibly purgeable memory, but not cause inactive pages to be
        reclaimed. It allows the app to calculate how much memory is free outside the free target. */
extern unsigned int     vm_page_free_target;
SYSCTL_INT(_vm, OID_AUTO, vm_page_free_target, CTLFLAG_RD | CTLFLAG_LOCKED, 
                   &vm_page_free_target, 0, "Pageout daemon free target");

extern unsigned int     vm_memory_pressure;
SYSCTL_INT(_vm, OID_AUTO, memory_pressure, CTLFLAG_RD | CTLFLAG_LOCKED,
           &vm_memory_pressure, 0, "Memory pressure indicator");

static int
vm_ctl_page_free_wanted SYSCTL_HANDLER_ARGS
{
#pragma unused(oidp, arg1, arg2)
        unsigned int page_free_wanted;

        page_free_wanted = mach_vm_ctl_page_free_wanted();
        return SYSCTL_OUT(req, &page_free_wanted, sizeof (page_free_wanted));
}
SYSCTL_PROC(_vm, OID_AUTO, page_free_wanted,
            CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_LOCKED,
            0, 0, vm_ctl_page_free_wanted, "I", "");

extern unsigned int     vm_page_purgeable_count;
SYSCTL_INT(_vm, OID_AUTO, page_purgeable_count, CTLFLAG_RD | CTLFLAG_LOCKED,
           &vm_page_purgeable_count, 0, "Purgeable page count");

extern unsigned int     vm_page_purgeable_wired_count;
SYSCTL_INT(_vm, OID_AUTO, page_purgeable_wired_count, CTLFLAG_RD | CTLFLAG_LOCKED,
           &vm_page_purgeable_wired_count, 0, "Wired purgeable page count");

extern int madvise_free_debug;
SYSCTL_INT(_vm, OID_AUTO, madvise_free_debug, CTLFLAG_RW | CTLFLAG_LOCKED,
           &madvise_free_debug, 0, "zero-fill on madvise(MADV_FREE*)");

SYSCTL_INT(_vm, OID_AUTO, page_reusable_count, CTLFLAG_RD | CTLFLAG_LOCKED,
           &vm_page_stats_reusable.reusable_count, 0, "Reusable page count");
SYSCTL_QUAD(_vm, OID_AUTO, reusable_success, CTLFLAG_RD | CTLFLAG_LOCKED,
           &vm_page_stats_reusable.reusable_pages_success, "");
SYSCTL_QUAD(_vm, OID_AUTO, reusable_failure, CTLFLAG_RD | CTLFLAG_LOCKED,
           &vm_page_stats_reusable.reusable_pages_failure, "");
SYSCTL_QUAD(_vm, OID_AUTO, reusable_shared, CTLFLAG_RD | CTLFLAG_LOCKED,
           &vm_page_stats_reusable.reusable_pages_shared, "");
SYSCTL_QUAD(_vm, OID_AUTO, all_reusable_calls, CTLFLAG_RD | CTLFLAG_LOCKED,
           &vm_page_stats_reusable.all_reusable_calls, "");
SYSCTL_QUAD(_vm, OID_AUTO, partial_reusable_calls, CTLFLAG_RD | CTLFLAG_LOCKED,
           &vm_page_stats_reusable.partial_reusable_calls, "");
SYSCTL_QUAD(_vm, OID_AUTO, reuse_success, CTLFLAG_RD | CTLFLAG_LOCKED,
           &vm_page_stats_reusable.reuse_pages_success, "");
SYSCTL_QUAD(_vm, OID_AUTO, reuse_failure, CTLFLAG_RD | CTLFLAG_LOCKED,
           &vm_page_stats_reusable.reuse_pages_failure, "");
SYSCTL_QUAD(_vm, OID_AUTO, all_reuse_calls, CTLFLAG_RD | CTLFLAG_LOCKED,
           &vm_page_stats_reusable.all_reuse_calls, "");
SYSCTL_QUAD(_vm, OID_AUTO, partial_reuse_calls, CTLFLAG_RD | CTLFLAG_LOCKED,
           &vm_page_stats_reusable.partial_reuse_calls, "");
SYSCTL_QUAD(_vm, OID_AUTO, can_reuse_success, CTLFLAG_RD | CTLFLAG_LOCKED,
           &vm_page_stats_reusable.can_reuse_success, "");
SYSCTL_QUAD(_vm, OID_AUTO, can_reuse_failure, CTLFLAG_RD | CTLFLAG_LOCKED,
           &vm_page_stats_reusable.can_reuse_failure, "");
SYSCTL_QUAD(_vm, OID_AUTO, reusable_reclaimed, CTLFLAG_RD | CTLFLAG_LOCKED,
           &vm_page_stats_reusable.reusable_reclaimed, "");


extern unsigned int vm_page_free_count, vm_page_speculative_count;
SYSCTL_UINT(_vm, OID_AUTO, page_free_count, CTLFLAG_RD | CTLFLAG_LOCKED, &vm_page_free_count, 0, "");
SYSCTL_UINT(_vm, OID_AUTO, page_speculative_count, CTLFLAG_RD | CTLFLAG_LOCKED, &vm_page_speculative_count, 0, "");

extern unsigned int vm_page_cleaned_count;
SYSCTL_UINT(_vm, OID_AUTO, page_cleaned_count, CTLFLAG_RD | CTLFLAG_LOCKED, &vm_page_cleaned_count, 0, "Cleaned queue size");

/* pageout counts */
extern unsigned int vm_pageout_inactive_dirty_internal, vm_pageout_inactive_dirty_external, vm_pageout_inactive_clean, vm_pageout_speculative_clean, vm_pageout_inactive_used;
extern unsigned int vm_pageout_freed_from_inactive_clean, vm_pageout_freed_from_speculative;
SYSCTL_UINT(_vm, OID_AUTO, pageout_inactive_dirty_internal, CTLFLAG_RD | CTLFLAG_LOCKED, &vm_pageout_inactive_dirty_internal, 0, "");
SYSCTL_UINT(_vm, OID_AUTO, pageout_inactive_dirty_external, CTLFLAG_RD | CTLFLAG_LOCKED, &vm_pageout_inactive_dirty_external, 0, "");
SYSCTL_UINT(_vm, OID_AUTO, pageout_inactive_clean, CTLFLAG_RD | CTLFLAG_LOCKED, &vm_pageout_inactive_clean, 0, "");
SYSCTL_UINT(_vm, OID_AUTO, pageout_speculative_clean, CTLFLAG_RD | CTLFLAG_LOCKED, &vm_pageout_speculative_clean, 0, "");
SYSCTL_UINT(_vm, OID_AUTO, pageout_inactive_used, CTLFLAG_RD | CTLFLAG_LOCKED, &vm_pageout_inactive_used, 0, "");
SYSCTL_UINT(_vm, OID_AUTO, pageout_freed_from_inactive_clean, CTLFLAG_RD | CTLFLAG_LOCKED, &vm_pageout_freed_from_inactive_clean, 0, "");
SYSCTL_UINT(_vm, OID_AUTO, pageout_freed_from_speculative, CTLFLAG_RD | CTLFLAG_LOCKED, &vm_pageout_freed_from_speculative, 0, "");

extern unsigned int vm_pageout_freed_from_cleaned;
SYSCTL_UINT(_vm, OID_AUTO, pageout_freed_from_cleaned, CTLFLAG_RD | CTLFLAG_LOCKED, &vm_pageout_freed_from_cleaned, 0, "");

/* counts of pages entering the cleaned queue */
extern unsigned int vm_pageout_enqueued_cleaned, vm_pageout_enqueued_cleaned_from_inactive_clean, vm_pageout_enqueued_cleaned_from_inactive_dirty;
SYSCTL_UINT(_vm, OID_AUTO, pageout_enqueued_cleaned, CTLFLAG_RD | CTLFLAG_LOCKED, &vm_pageout_enqueued_cleaned, 0, ""); /* sum of next two */
SYSCTL_UINT(_vm, OID_AUTO, pageout_enqueued_cleaned_from_inactive_clean, CTLFLAG_RD | CTLFLAG_LOCKED, &vm_pageout_enqueued_cleaned_from_inactive_clean, 0, "");
SYSCTL_UINT(_vm, OID_AUTO, pageout_enqueued_cleaned_from_inactive_dirty, CTLFLAG_RD | CTLFLAG_LOCKED, &vm_pageout_enqueued_cleaned_from_inactive_dirty, 0, "");

/* counts of pages leaving the cleaned queue */
extern unsigned int vm_pageout_cleaned_reclaimed, vm_pageout_cleaned_reactivated, vm_pageout_cleaned_reference_reactivated, vm_pageout_cleaned_volatile_reactivated, vm_pageout_cleaned_fault_reactivated, vm_pageout_cleaned_commit_reactivated, vm_pageout_cleaned_busy, vm_pageout_cleaned_nolock;
SYSCTL_UINT(_vm, OID_AUTO, pageout_cleaned, CTLFLAG_RD | CTLFLAG_LOCKED, &vm_pageout_cleaned_reclaimed, 0, "Cleaned pages reclaimed");
SYSCTL_UINT(_vm, OID_AUTO, pageout_cleaned_reactivated, CTLFLAG_RD | CTLFLAG_LOCKED, &vm_pageout_cleaned_reactivated, 0, "Cleaned pages reactivated"); /* sum of all reactivated AND busy and nolock (even though those actually get reDEactivated */
SYSCTL_UINT(_vm, OID_AUTO, pageout_cleaned_reference_reactivated, CTLFLAG_RD | CTLFLAG_LOCKED, &vm_pageout_cleaned_reference_reactivated, 0, "Cleaned pages reference reactivated");
SYSCTL_UINT(_vm, OID_AUTO, pageout_cleaned_volatile_reactivated, CTLFLAG_RD | CTLFLAG_LOCKED, &vm_pageout_cleaned_volatile_reactivated, 0, "Cleaned pages volatile reactivated");
SYSCTL_UINT(_vm, OID_AUTO, pageout_cleaned_fault_reactivated, CTLFLAG_RD | CTLFLAG_LOCKED, &vm_pageout_cleaned_fault_reactivated, 0, "Cleaned pages fault reactivated");
SYSCTL_UINT(_vm, OID_AUTO, pageout_cleaned_commit_reactivated, CTLFLAG_RD | CTLFLAG_LOCKED, &vm_pageout_cleaned_commit_reactivated, 0, "Cleaned pages commit reactivated");
SYSCTL_UINT(_vm, OID_AUTO, pageout_cleaned_busy, CTLFLAG_RD | CTLFLAG_LOCKED, &vm_pageout_cleaned_busy, 0, "Cleaned pages busy (deactivated)");
SYSCTL_UINT(_vm, OID_AUTO, pageout_cleaned_nolock, CTLFLAG_RD | CTLFLAG_LOCKED, &vm_pageout_cleaned_nolock, 0, "Cleaned pages no-lock (deactivated)");

/* counts of pages prefaulted when entering a memory object */
extern int64_t vm_prefault_nb_pages, vm_prefault_nb_bailout;
SYSCTL_QUAD(_vm, OID_AUTO, prefault_nb_pages, CTLFLAG_RW | CTLFLAG_LOCKED, &vm_prefault_nb_pages, "");
SYSCTL_QUAD(_vm, OID_AUTO, prefault_nb_bailout, CTLFLAG_RW | CTLFLAG_LOCKED, &vm_prefault_nb_bailout, "");

#include <kern/thread.h>
#include <sys/user.h>

void vm_pageout_io_throttle(void);

void vm_pageout_io_throttle(void) {
        struct uthread *uthread = get_bsdthread_info(current_thread());
 
               /*
                * thread is marked as a low priority I/O type
                * and the I/O we issued while in this cleaning operation
                * collided with normal I/O operations... we'll
                * delay in order to mitigate the impact of this
                * task on the normal operation of the system
                */

        if (uthread->uu_lowpri_window) {
                throttle_lowpri_io(1);
        }

}

int
vm_pressure_monitor(
        __unused struct proc *p,
        struct vm_pressure_monitor_args *uap,
        int *retval)
{
        kern_return_t   kr;
        uint32_t        pages_reclaimed;
        uint32_t        pages_wanted;

        kr = mach_vm_pressure_monitor(
                (boolean_t) uap->wait_for_pressure,
                uap->nsecs_monitored,
                (uap->pages_reclaimed) ? &pages_reclaimed : NULL,
                &pages_wanted);

        switch (kr) {
        case KERN_SUCCESS:
                break;
        case KERN_ABORTED:
                return EINTR;
        default:
                return EINVAL;
        }

        if (uap->pages_reclaimed) {
                if (copyout((void *)&pages_reclaimed,
                            uap->pages_reclaimed,
                            sizeof (pages_reclaimed)) != 0) {
                        return EFAULT;
                }
        }

        *retval = (int) pages_wanted;
        return 0;
}

int
kas_info(struct proc *p,
                          struct kas_info_args *uap,
                          int *retval __unused)
{
#ifdef SECURE_KERNEL
        (void)p;
        (void)uap;
        return ENOTSUP;
#else /* !SECURE_KERNEL */
        int                     selector = uap->selector;
        user_addr_t     valuep = uap->value;
        user_addr_t     sizep = uap->size;
        user_size_t size;
        int                     error;

        if (!kauth_cred_issuser(kauth_cred_get())) {
                return EPERM;
        }

#if CONFIG_MACF
        error = mac_system_check_kas_info(kauth_cred_get(), selector);
        if (error) {
                return error;
        }
#endif

        if (IS_64BIT_PROCESS(p)) {
                user64_size_t size64;
                error = copyin(sizep, &size64, sizeof(size64));
                size = (user_size_t)size64;
        } else {
                user32_size_t size32;
                error = copyin(sizep, &size32, sizeof(size32));
                size = (user_size_t)size32;
        }
        if (error) {
                return error;
        }

        switch (selector) {
                case KAS_INFO_KERNEL_TEXT_SLIDE_SELECTOR:
                        {
                                uint64_t slide = vm_kernel_slide;

                                if (sizeof(slide) != size) {
                                        return EINVAL;
                                }
                                
                                if (IS_64BIT_PROCESS(p)) {
                                        user64_size_t size64 = (user64_size_t)size;
                                        error = copyout(&size64, sizep, sizeof(size64));
                                } else {
                                        user32_size_t size32 = (user32_size_t)size;
                                        error = copyout(&size32, sizep, sizeof(size32));
                                }
                                if (error) {
                                        return error;
                                }
                                
                                error = copyout(&slide, valuep, sizeof(slide));
                                if (error) {
                                        return error;
                                }
                        }
                        break;
                default:
                        return EINVAL;
        }

        return 0;
#endif /* !SECURE_KERNEL */
}