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gems-kernel/source/THIRDPARTY/xnu/bsd/kern/kern_resource.c

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add darwin/xnu functionality
2024-06-03 16:29:39 +00:00
/*
* Copyright (c) 2000-2020 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@
*/
/* Copyright (c) 1995, 1997 Apple Computer, Inc. All Rights Reserved */
/*-
* Copyright (c) 1982, 1986, 1991, 1993
* The Regents of the University of California. All rights reserved.
* (c) UNIX System Laboratories, Inc.
* All or some portions of this file are derived from material licensed
* to the University of California by American Telephone and Telegraph
* Co. or Unix System Laboratories, Inc. and are reproduced herein with
* the permission of UNIX System Laboratories, Inc.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* @(#)kern_resource.c 8.5 (Berkeley) 1/21/94
*/
/*
* NOTICE: This file was modified by SPARTA, Inc. in 2005 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 <sys/param.h>
#include <sys/systm.h>
#include <sys/sysctl.h>
#include <sys/kernel.h>
#include <sys/file_internal.h>
#include <sys/resourcevar.h>
#include <sys/malloc.h>
#include <sys/proc_internal.h>
#include <sys/kauth.h>
#include <sys/mount_internal.h>
#include <sys/sysproto.h>
#include <security/audit/audit.h>
#include <machine/vmparam.h>
#include <mach/mach_types.h>
#include <mach/time_value.h>
#include <mach/task.h>
#include <mach/task_info.h>
#include <mach/vm_map.h>
#include <mach/mach_vm.h>
#include <mach/thread_act.h> /* for thread_policy_set( ) */
#include <kern/thread.h>
#include <kern/policy_internal.h>
#include <kern/task.h>
#include <kern/clock.h> /* for absolutetime_to_microtime() */
#include <netinet/in.h> /* for TRAFFIC_MGT_SO_* */
#if CONFIG_FREEZE
#include <sys/kern_memorystatus_freeze.h> /* for memorystatus_freeze_mark_ui_transition */
#endif /* CONFIG_FREEZE */
#include <sys/socketvar.h> /* for struct socket */
#if NECP
#include <net/necp.h>
#endif /* NECP */
#include <vm/vm_map.h>
#include <kern/assert.h>
#include <sys/resource.h>
#include <sys/resource_private.h>
#include <sys/priv.h>
#include <IOKit/IOBSD.h>
#if CONFIG_MACF
#include <security/mac_framework.h>
#endif
static void proc_limitblock(proc_t p);
static void proc_limitunblock(proc_t p);
static void proc_limitupdate(proc_t p, bool unblock,
void (^update)(struct plimit *plim));
static int donice(struct proc *curp, struct proc *chgp, int n);
static int dosetrlimit(struct proc *p, u_int which, struct rlimit *limp);
static void do_background_socket(struct proc *p, thread_t thread);
static int do_background_thread(thread_t thread, int priority);
static int do_background_proc(struct proc *curp, struct proc *targetp, int priority);
static int set_gpudeny_proc(struct proc *curp, struct proc *targetp, int priority);
static int proc_set_darwin_role(proc_t curp, proc_t targetp, int priority);
static int proc_get_darwin_role(proc_t curp, proc_t targetp, int *priority);
static int proc_set_game_mode(proc_t targetp, int priority);
static int proc_get_game_mode(proc_t targetp, int *priority);
static int get_background_proc(struct proc *curp, struct proc *targetp, int *priority);
int fill_task_rusage(task_t task, rusage_info_current *ri);
void fill_task_billed_usage(task_t task, rusage_info_current *ri);
int fill_task_io_rusage(task_t task, rusage_info_current *ri);
int fill_task_qos_rusage(task_t task, rusage_info_current *ri);
uint64_t get_task_logical_writes(task_t task, bool external);
rlim_t maxdmap = MAXDSIZ; /* XXX */
rlim_t maxsmap = MAXSSIZ - PAGE_MAX_SIZE; /* XXX */
/* For plimit reference count */
os_refgrp_decl(, rlimit_refgrp, "plimit_refcnt", NULL);
static KALLOC_TYPE_DEFINE(plimit_zone, struct plimit, KT_DEFAULT);
/*
* Limits on the number of open files per process, and the number
* of child processes per process.
*
* Note: would be in kern/subr_param.c in FreeBSD.
*/
__private_extern__ int maxfilesperproc = OPEN_MAX; /* per-proc open files limit */
SYSCTL_INT(_kern, KERN_MAXPROCPERUID, maxprocperuid, CTLFLAG_RW | CTLFLAG_LOCKED,
&maxprocperuid, 0, "Maximum processes allowed per userid" );
SYSCTL_INT(_kern, KERN_MAXFILESPERPROC, maxfilesperproc, CTLFLAG_RW | CTLFLAG_LOCKED,
&maxfilesperproc, 0, "Maximum files allowed open per process" );
/* Args and fn for proc_iteration callback used in setpriority */
struct puser_nice_args {
proc_t curp;
int prio;
id_t who;
int * foundp;
int * errorp;
};
static int puser_donice_callback(proc_t p, void * arg);
/* Args and fn for proc_iteration callback used in setpriority */
struct ppgrp_nice_args {
proc_t curp;
int prio;
int * foundp;
int * errorp;
};
static int ppgrp_donice_callback(proc_t p, void * arg);
/*
* Resource controls and accounting.
*/
int
getpriority(struct proc *curp, struct getpriority_args *uap, int32_t *retval)
{
struct proc *p;
int low = PRIO_MAX + 1;
kauth_cred_t my_cred;
int refheld = 0;
int error = 0;
/* would also test (uap->who < 0), but id_t is unsigned */
if (uap->who > 0x7fffffff) {
return EINVAL;
}
switch (uap->which) {
case PRIO_PROCESS:
if (uap->who == 0) {
p = curp;
low = p->p_nice;
} else {
p = proc_find(uap->who);
if (p == 0) {
break;
}
low = p->p_nice;
proc_rele(p);
}
break;
case PRIO_PGRP: {
struct pgrp *pg = PGRP_NULL;
if (uap->who == 0) {
/* returns the pgrp to ref */
pg = proc_pgrp(curp, NULL);
} else if ((pg = pgrp_find(uap->who)) == PGRP_NULL) {
break;
}
/* No need for iteration as it is a simple scan */
pgrp_lock(pg);
PGMEMBERS_FOREACH(pg, p) {
if (p->p_nice < low) {
low = p->p_nice;
}
}
pgrp_unlock(pg);
pgrp_rele(pg);
break;
}
case PRIO_USER:
if (uap->who == 0) {
uap->who = kauth_cred_getuid(kauth_cred_get());
}
proc_list_lock();
for (p = allproc.lh_first; p != 0; p = p->p_list.le_next) {
my_cred = kauth_cred_proc_ref(p);
if (kauth_cred_getuid(my_cred) == uap->who &&
p->p_nice < low) {
low = p->p_nice;
}
kauth_cred_unref(&my_cred);
}
proc_list_unlock();
break;
case PRIO_DARWIN_THREAD:
/* we currently only support the current thread */
if (uap->who != 0) {
return EINVAL;
}
low = proc_get_thread_policy(current_thread(), TASK_POLICY_INTERNAL, TASK_POLICY_DARWIN_BG);
break;
case PRIO_DARWIN_PROCESS:
if (uap->who == 0) {
p = curp;
} else {
p = proc_find(uap->who);
if (p == PROC_NULL) {
break;
}
refheld = 1;
}
error = get_background_proc(curp, p, &low);
if (refheld) {
proc_rele(p);
}
if (error) {
return error;
}
break;
case PRIO_DARWIN_ROLE:
if (uap->who == 0) {
p = curp;
} else {
p = proc_find(uap->who);
if (p == PROC_NULL) {
break;
}
refheld = 1;
}
error = proc_get_darwin_role(curp, p, &low);
if (refheld) {
proc_rele(p);
}
if (error) {
return error;
}
break;
case PRIO_DARWIN_GAME_MODE:
if (uap->who == 0) {
p = curp;
} else {
p = proc_find(uap->who);
if (p == PROC_NULL) {
break;
}
refheld = 1;
}
error = proc_get_game_mode(p, &low);
if (refheld) {
proc_rele(p);
}
if (error) {
return error;
}
break;
default:
return EINVAL;
}
if (low == PRIO_MAX + 1) {
return ESRCH;
}
*retval = low;
return 0;
}
/* call back function used for proc iteration in PRIO_USER */
static int
puser_donice_callback(proc_t p, void * arg)
{
int error, n;
struct puser_nice_args * pun = (struct puser_nice_args *)arg;
kauth_cred_t my_cred;
my_cred = kauth_cred_proc_ref(p);
if (kauth_cred_getuid(my_cred) == pun->who) {
error = donice(pun->curp, p, pun->prio);
if (pun->errorp != NULL) {
*pun->errorp = error;
}
if (pun->foundp != NULL) {
n = *pun->foundp;
*pun->foundp = n + 1;
}
}
kauth_cred_unref(&my_cred);
return PROC_RETURNED;
}
/* call back function used for proc iteration in PRIO_PGRP */
static int
ppgrp_donice_callback(proc_t p, void * arg)
{
int error;
struct ppgrp_nice_args * pun = (struct ppgrp_nice_args *)arg;
int n;
error = donice(pun->curp, p, pun->prio);
if (pun->errorp != NULL) {
*pun->errorp = error;
}
if (pun->foundp != NULL) {
n = *pun->foundp;
*pun->foundp = n + 1;
}
return PROC_RETURNED;
}
/*
* Returns: 0 Success
* EINVAL
* ESRCH
* donice:EPERM
* donice:EACCES
*/
/* ARGSUSED */
int
setpriority(struct proc *curp, struct setpriority_args *uap, int32_t *retval)
{
struct proc *p;
int found = 0, error = 0;
int refheld = 0;
AUDIT_ARG(cmd, uap->which);
AUDIT_ARG(owner, uap->who, 0);
AUDIT_ARG(value32, uap->prio);
/* would also test (uap->who < 0), but id_t is unsigned */
if (uap->who > 0x7fffffff) {
return EINVAL;
}
switch (uap->which) {
case PRIO_PROCESS:
if (uap->who == 0) {
p = curp;
} else {
p = proc_find(uap->who);
if (p == 0) {
break;
}
refheld = 1;
}
error = donice(curp, p, uap->prio);
found++;
if (refheld != 0) {
proc_rele(p);
}
break;
case PRIO_PGRP: {
struct pgrp *pg = PGRP_NULL;
struct ppgrp_nice_args ppgrp;
if (uap->who == 0) {
pg = proc_pgrp(curp, NULL);
} else if ((pg = pgrp_find(uap->who)) == PGRP_NULL) {
break;
}
ppgrp.curp = curp;
ppgrp.prio = uap->prio;
ppgrp.foundp = &found;
ppgrp.errorp = &error;
pgrp_iterate(pg, ppgrp_donice_callback, (void *)&ppgrp, NULL);
pgrp_rele(pg);
break;
}
case PRIO_USER: {
struct puser_nice_args punice;
if (uap->who == 0) {
uap->who = kauth_cred_getuid(kauth_cred_get());
}
punice.curp = curp;
punice.prio = uap->prio;
punice.who = uap->who;
punice.foundp = &found;
error = 0;
punice.errorp = &error;
proc_iterate(PROC_ALLPROCLIST, puser_donice_callback, (void *)&punice, NULL, NULL);
break;
}
case PRIO_DARWIN_THREAD: {
/* we currently only support the current thread */
if (uap->who != 0) {
return EINVAL;
}
error = do_background_thread(current_thread(), uap->prio);
found++;
break;
}
case PRIO_DARWIN_PROCESS: {
if (uap->who == 0) {
p = curp;
} else {
p = proc_find(uap->who);
if (p == 0) {
break;
}
refheld = 1;
}
error = do_background_proc(curp, p, uap->prio);
found++;
if (refheld != 0) {
proc_rele(p);
}
break;
}
case PRIO_DARWIN_GPU: {
if (uap->who == 0) {
return EINVAL;
}
p = proc_find(uap->who);
if (p == PROC_NULL) {
break;
}
error = set_gpudeny_proc(curp, p, uap->prio);
found++;
proc_rele(p);
break;
}
case PRIO_DARWIN_ROLE: {
if (uap->who == 0) {
p = curp;
} else {
p = proc_find(uap->who);
if (p == PROC_NULL) {
break;
}
refheld = 1;
}
error = proc_set_darwin_role(curp, p, uap->prio);
found++;
if (refheld != 0) {
proc_rele(p);
}
break;
}
case PRIO_DARWIN_GAME_MODE: {
if (uap->who == 0) {
p = curp;
} else {
p = proc_find(uap->who);
if (p == PROC_NULL) {
break;
}
refheld = 1;
}
error = proc_set_game_mode(p, uap->prio);
found++;
if (refheld != 0) {
proc_rele(p);
}
break;
}
default:
return EINVAL;
}
if (found == 0) {
return ESRCH;
}
if (error == EIDRM) {
*retval = -2;
error = 0;
}
return error;
}
/*
* Returns: 0 Success
* EPERM
* EACCES
* mac_check_proc_sched:???
*/
static int
donice(struct proc *curp, struct proc *chgp, int n)
{
int error = 0;
kauth_cred_t ucred;
kauth_cred_t my_cred;
ucred = kauth_cred_proc_ref(curp);
my_cred = kauth_cred_proc_ref(chgp);
if (suser(ucred, NULL) && kauth_cred_getruid(ucred) &&
kauth_cred_getuid(ucred) != kauth_cred_getuid(my_cred) &&
kauth_cred_getruid(ucred) != kauth_cred_getuid(my_cred)) {
error = EPERM;
goto out;
}
if (n > PRIO_MAX) {
n = PRIO_MAX;
}
if (n < PRIO_MIN) {
n = PRIO_MIN;
}
if (n < chgp->p_nice && suser(ucred, &curp->p_acflag)) {
error = EACCES;
goto out;
}
#if CONFIG_MACF
error = mac_proc_check_sched(curp, chgp);
if (error) {
goto out;
}
#endif
proc_lock(chgp);
chgp->p_nice = (char)n;
proc_unlock(chgp);
(void)resetpriority(chgp);
out:
kauth_cred_unref(&ucred);
kauth_cred_unref(&my_cred);
return error;
}
static int
set_gpudeny_proc(struct proc *curp, struct proc *targetp, int priority)
{
int error = 0;
kauth_cred_t ucred;
kauth_cred_t target_cred;
ucred = kauth_cred_get();
target_cred = kauth_cred_proc_ref(targetp);
/* TODO: Entitlement instead of uid check */
if (!kauth_cred_issuser(ucred) && kauth_cred_getruid(ucred) &&
kauth_cred_getuid(ucred) != kauth_cred_getuid(target_cred) &&
kauth_cred_getruid(ucred) != kauth_cred_getuid(target_cred)) {
error = EPERM;
goto out;
}
if (curp == targetp) {
error = EPERM;
goto out;
}
#if CONFIG_MACF
error = mac_proc_check_sched(curp, targetp);
if (error) {
goto out;
}
#endif
switch (priority) {
case PRIO_DARWIN_GPU_DENY:
task_set_gpu_denied(proc_task(targetp), TRUE);
break;
case PRIO_DARWIN_GPU_ALLOW:
task_set_gpu_denied(proc_task(targetp), FALSE);
break;
default:
error = EINVAL;
goto out;
}
out:
kauth_cred_unref(&target_cred);
return error;
}
static int
proc_set_darwin_role(proc_t curp, proc_t targetp, int priority)
{
int error = 0;
uint32_t flagsp = 0;
kauth_cred_t ucred, target_cred;
ucred = kauth_cred_get();
target_cred = kauth_cred_proc_ref(targetp);
if (!kauth_cred_issuser(ucred) && kauth_cred_getruid(ucred) &&
kauth_cred_getuid(ucred) != kauth_cred_getuid(target_cred) &&
kauth_cred_getruid(ucred) != kauth_cred_getuid(target_cred)) {
if (priv_check_cred(ucred, PRIV_SETPRIORITY_DARWIN_ROLE, 0) != 0) {
error = EPERM;
goto out;
}
}
if (curp != targetp) {
#if CONFIG_MACF
if ((error = mac_proc_check_sched(curp, targetp))) {
goto out;
}
#endif
}
proc_get_darwinbgstate(proc_task(targetp), &flagsp);
if ((flagsp & PROC_FLAG_APPLICATION) != PROC_FLAG_APPLICATION) {
error = ENOTSUP;
goto out;
}
task_role_t role = TASK_UNSPECIFIED;
if ((error = proc_darwin_role_to_task_role(priority, &role))) {
goto out;
}
proc_set_task_policy(proc_task(targetp), TASK_POLICY_ATTRIBUTE,
TASK_POLICY_ROLE, role);
#if CONFIG_FREEZE
if (priority == PRIO_DARWIN_ROLE_UI_FOCAL || priority == PRIO_DARWIN_ROLE_UI || priority == PRIO_DARWIN_ROLE_UI_NON_FOCAL) {
memorystatus_freezer_mark_ui_transition(targetp);
}
#endif /* CONFIG_FREEZE */
out:
kauth_cred_unref(&target_cred);
return error;
}
static int
proc_get_darwin_role(proc_t curp, proc_t targetp, int *priority)
{
int error = 0;
int role = 0;
kauth_cred_t ucred, target_cred;
ucred = kauth_cred_get();
target_cred = kauth_cred_proc_ref(targetp);
if (!kauth_cred_issuser(ucred) && kauth_cred_getruid(ucred) &&
kauth_cred_getuid(ucred) != kauth_cred_getuid(target_cred) &&
kauth_cred_getruid(ucred) != kauth_cred_getuid(target_cred)) {
error = EPERM;
goto out;
}
if (curp != targetp) {
#if CONFIG_MACF
if ((error = mac_proc_check_sched(curp, targetp))) {
goto out;
}
#endif
}
role = proc_get_task_policy(proc_task(targetp), TASK_POLICY_ATTRIBUTE, TASK_POLICY_ROLE);
*priority = proc_task_role_to_darwin_role(role);
out:
kauth_cred_unref(&target_cred);
return error;
}
#define SET_GAME_MODE_ENTITLEMENT "com.apple.private.set-game-mode"
static int
proc_set_game_mode(proc_t targetp, int priority)
{
int error = 0;
kauth_cred_t ucred, target_cred;
ucred = kauth_cred_get();
target_cred = kauth_cred_proc_ref(targetp);
boolean_t entitled = FALSE;
entitled = IOCurrentTaskHasEntitlement(SET_GAME_MODE_ENTITLEMENT);
if (!entitled) {
error = EPERM;
goto out;
}
/* Even with entitlement, non-root is only alllowed to set same-user */
if (!kauth_cred_issuser(ucred) &&
kauth_cred_getuid(ucred) != kauth_cred_getuid(target_cred)) {
error = EPERM;
goto out;
}
switch (priority) {
case PRIO_DARWIN_GAME_MODE_OFF:
task_set_game_mode(proc_task(targetp), false);
break;
case PRIO_DARWIN_GAME_MODE_ON:
task_set_game_mode(proc_task(targetp), true);
break;
default:
error = EINVAL;
goto out;
}
out:
kauth_cred_unref(&target_cred);
return error;
}
static int
proc_get_game_mode(proc_t targetp, int *priority)
{
int error = 0;
kauth_cred_t ucred, target_cred;
ucred = kauth_cred_get();
target_cred = kauth_cred_proc_ref(targetp);
boolean_t entitled = FALSE;
entitled = IOCurrentTaskHasEntitlement(SET_GAME_MODE_ENTITLEMENT);
/* Root is allowed to get without entitlement */
if (!kauth_cred_issuser(ucred) && !entitled) {
error = EPERM;
goto out;
}
/* Even with entitlement, non-root is only alllowed to see same-user */
if (!kauth_cred_issuser(ucred) &&
kauth_cred_getuid(ucred) != kauth_cred_getuid(target_cred)) {
error = EPERM;
goto out;
}
if (task_get_game_mode(proc_task(targetp))) {
*priority = PRIO_DARWIN_GAME_MODE_ON;
} else {
*priority = PRIO_DARWIN_GAME_MODE_OFF;
}
out:
kauth_cred_unref(&target_cred);
return error;
}
static int
get_background_proc(struct proc *curp, struct proc *targetp, int *priority)
{
int external = 0;
int error = 0;
kauth_cred_t ucred, target_cred;
ucred = kauth_cred_get();
target_cred = kauth_cred_proc_ref(targetp);
if (!kauth_cred_issuser(ucred) && kauth_cred_getruid(ucred) &&
kauth_cred_getuid(ucred) != kauth_cred_getuid(target_cred) &&
kauth_cred_getruid(ucred) != kauth_cred_getuid(target_cred)) {
error = EPERM;
goto out;
}
external = (curp == targetp) ? TASK_POLICY_INTERNAL : TASK_POLICY_EXTERNAL;
*priority = proc_get_task_policy(current_task(), external, TASK_POLICY_DARWIN_BG);
out:
kauth_cred_unref(&target_cred);
return error;
}
static int
do_background_proc(struct proc *curp, struct proc *targetp, int priority)
{
#if !CONFIG_MACF
#pragma unused(curp)
#endif
int error = 0;
kauth_cred_t ucred;
kauth_cred_t target_cred;
int external;
int enable;
ucred = kauth_cred_get();
target_cred = kauth_cred_proc_ref(targetp);
if (!kauth_cred_issuser(ucred) && kauth_cred_getruid(ucred) &&
kauth_cred_getuid(ucred) != kauth_cred_getuid(target_cred) &&
kauth_cred_getruid(ucred) != kauth_cred_getuid(target_cred)) {
error = EPERM;
goto out;
}
#if CONFIG_MACF
error = mac_proc_check_sched(curp, targetp);
if (error) {
goto out;
}
#endif
external = (curp == targetp) ? TASK_POLICY_INTERNAL : TASK_POLICY_EXTERNAL;
switch (priority) {
case PRIO_DARWIN_BG:
enable = TASK_POLICY_ENABLE;
break;
case PRIO_DARWIN_NONUI:
/* ignored for compatibility */
goto out;
default:
/* TODO: EINVAL if priority != 0 */
enable = TASK_POLICY_DISABLE;
break;
}
proc_set_task_policy(proc_task(targetp), external, TASK_POLICY_DARWIN_BG, enable);
out:
kauth_cred_unref(&target_cred);
return error;
}
static void
do_background_socket(struct proc *p, thread_t thread)
{
#if SOCKETS
struct fileproc *fp;
int background = false;
#if NECP
int update_necp = false;
#endif /* NECP */
if (thread != THREAD_NULL &&
get_threadtask(thread) != proc_task(p)) {
return;
}
proc_fdlock(p);
if (thread != THREAD_NULL) {
background = proc_get_effective_thread_policy(thread, TASK_POLICY_ALL_SOCKETS_BG);
} else {
background = proc_get_effective_task_policy(proc_task(p), TASK_POLICY_ALL_SOCKETS_BG);
}
if (background) {
/*
* For PRIO_DARWIN_PROCESS (thread is NULL), simply mark
* the sockets with the background flag. There's nothing
* to do here for the PRIO_DARWIN_THREAD case.
*/
if (thread == THREAD_NULL) {
fdt_foreach(fp, p) {
if (FILEGLOB_DTYPE(fp->fp_glob) == DTYPE_SOCKET) {
struct socket *sockp = (struct socket *)fp_get_data(fp);
socket_set_traffic_mgt_flags(sockp, TRAFFIC_MGT_SO_BACKGROUND);
sockp->so_background_thread = NULL;
}
#if NECP
else if (FILEGLOB_DTYPE(fp->fp_glob) == DTYPE_NETPOLICY) {
if (necp_set_client_as_background(p, fp, background)) {
update_necp = true;
}
}
#endif /* NECP */
}
}
} else {
/* disable networking IO throttle.
* NOTE - It is a known limitation of the current design that we
* could potentially clear TRAFFIC_MGT_SO_BACKGROUND bit for
* sockets created by other threads within this process.
*/
fdt_foreach(fp, p) {
struct socket *sockp;
if (FILEGLOB_DTYPE(fp->fp_glob) == DTYPE_SOCKET) {
sockp = (struct socket *)fp_get_data(fp);
/* skip if only clearing this thread's sockets */
if ((thread) && (sockp->so_background_thread != thread)) {
continue;
}
socket_clear_traffic_mgt_flags(sockp, TRAFFIC_MGT_SO_BACKGROUND);
sockp->so_background_thread = NULL;
}
#if NECP
else if (FILEGLOB_DTYPE(fp->fp_glob) == DTYPE_NETPOLICY) {
if (necp_set_client_as_background(p, fp, background)) {
update_necp = true;
}
}
#endif /* NECP */
}
}
proc_fdunlock(p);
#if NECP
if (update_necp) {
necp_update_all_clients();
}
#endif /* NECP */
#else
#pragma unused(p, thread)
#endif
}
/*
* do_background_thread
*
* Requires: thread reference
*
* Returns: 0 Success
* EPERM Tried to background while in vfork
* XXX - todo - does this need a MACF hook?
*/
static int
do_background_thread(thread_t thread, int priority)
{
int enable, external;
int rv = 0;
/* Backgrounding is unsupported for workq threads */
if (thread_is_static_param(thread)) {
return EPERM;
}
/* Not allowed to combine QoS and DARWIN_BG, doing so strips the QoS */
if (thread_has_qos_policy(thread)) {
thread_remove_qos_policy(thread);
rv = EIDRM;
}
/* TODO: Fail if someone passes something besides 0 or PRIO_DARWIN_BG */
enable = (priority == PRIO_DARWIN_BG) ? TASK_POLICY_ENABLE : TASK_POLICY_DISABLE;
external = (current_thread() == thread) ? TASK_POLICY_INTERNAL : TASK_POLICY_EXTERNAL;
proc_set_thread_policy(thread, external, TASK_POLICY_DARWIN_BG, enable);
return rv;
}
/*
* Returns: 0 Success
* copyin:EFAULT
* dosetrlimit:
*/
/* ARGSUSED */
int
setrlimit(struct proc *p, struct setrlimit_args *uap, __unused int32_t *retval)
{
struct rlimit alim;
int error;
if ((error = copyin(uap->rlp, (caddr_t)&alim,
sizeof(struct rlimit)))) {
return error;
}
return dosetrlimit(p, uap->which, &alim);
}
/*
* Returns: 0 Success
* EINVAL
* suser:EPERM
*
* Notes: EINVAL is returned both for invalid arguments, and in the
* case that the current usage (e.g. RLIMIT_STACK) is already
* in excess of the requested limit.
*/
static int
dosetrlimit(struct proc *p, u_int which, struct rlimit *newrlim)
{
struct rlimit rlim, stack_rlim = {.rlim_cur = 0, .rlim_max = 0};
int error;
kern_return_t kr;
/* Mask out POSIX flag, saved above */
which &= ~_RLIMIT_POSIX_FLAG;
/* Unknown resource */
if (which >= RLIM_NLIMITS) {
return EINVAL;
}
proc_lock(p);
/* Only one thread is able to change the current process's rlimit values */
proc_limitblock(p);
/*
* Take a snapshot of the current rlimit values and read this throughout
* this routine. This minimizes the critical sections and allow other
* processes in the system to access the plimit while we are in the
* middle of this setrlimit call.
*/
rlim = smr_serialized_load(&p->p_limit)->pl_rlimit[which];
proc_unlock(p);
error = 0;
/* Sanity check: new soft limit cannot exceed new hard limit */
if (newrlim->rlim_cur > newrlim->rlim_max) {
error = EINVAL;
}
/*
* Sanity check: only super-user may raise the hard limit.
* newrlim->rlim_cur > rlim.rlim_max implies that the call
* is increasing the hard limit as well.
*/
else if (newrlim->rlim_cur > rlim.rlim_max || newrlim->rlim_max > rlim.rlim_max) {
/* suser() returns 0 if the calling thread is super user. */
error = suser(kauth_cred_get(), &p->p_acflag);
}
if (error) {
/* Invalid setrlimit request: EINVAL or EPERM */
goto out;
}
/* We have the reader lock of the process's plimit so it's safe to read the rlimit values */
switch (which) {
case RLIMIT_CPU:
if (newrlim->rlim_cur == RLIM_INFINITY) {
task_vtimer_clear(proc_task(p), TASK_VTIMER_RLIM);
timerclear(&p->p_rlim_cpu);
} else {
task_absolutetime_info_data_t tinfo;
mach_msg_type_number_t count;
struct timeval ttv, tv;
clock_sec_t tv_sec;
clock_usec_t tv_usec;
count = TASK_ABSOLUTETIME_INFO_COUNT;
task_info(proc_task(p), TASK_ABSOLUTETIME_INFO, (task_info_t)&tinfo, &count);
absolutetime_to_microtime(tinfo.total_user + tinfo.total_system, &tv_sec, &tv_usec);
ttv.tv_sec = tv_sec;
ttv.tv_usec = tv_usec;
tv.tv_sec = (newrlim->rlim_cur > __INT_MAX__ ? __INT_MAX__ : (__darwin_time_t)newrlim->rlim_cur);
tv.tv_usec = 0;
timersub(&tv, &ttv, &p->p_rlim_cpu);
timerclear(&tv);
if (timercmp(&p->p_rlim_cpu, &tv, >)) {
task_vtimer_set(proc_task(p), TASK_VTIMER_RLIM);
} else {
task_vtimer_clear(proc_task(p), TASK_VTIMER_RLIM);
timerclear(&p->p_rlim_cpu);
psignal(p, SIGXCPU);
}
}
break;
case RLIMIT_DATA:
#if 00
if (newrlim->rlim_cur > maxdmap) {
newrlim->rlim_cur = maxdmap;
}
if (newrlim->rlim_max > maxdmap) {
newrlim->rlim_max = maxdmap;
}
#endif
/* Over to Mach VM to validate the new data limit */
if (vm_map_set_data_limit(current_map(), newrlim->rlim_cur) != KERN_SUCCESS) {
/* The limit specified cannot be lowered because current usage is already higher than the limit. */
error = EINVAL;
goto out;
}
break;
case RLIMIT_STACK:
if (p->p_lflag & P_LCUSTOM_STACK) {
/* Process has a custom stack set - rlimit cannot be used to change it */
error = EINVAL;
goto out;
}
/*
* Note: the real stack size limit is enforced by maxsmap, not a process's RLIMIT_STACK.
*
* The kernel uses maxsmap to control the actual stack size limit. While we allow
* processes to set RLIMIT_STACK to RLIM_INFINITY (UNIX 03), accessing memory
* beyond the maxsmap will still trigger an exception.
*
* stack_rlim is used to store the user-defined RLIMIT_STACK values while we adjust
* the stack size using kernel limit (i.e. maxsmap).
*/
if (newrlim->rlim_cur > maxsmap ||
newrlim->rlim_max > maxsmap) {
if (newrlim->rlim_cur > maxsmap) {
stack_rlim.rlim_cur = newrlim->rlim_cur;
newrlim->rlim_cur = maxsmap;
}
if (newrlim->rlim_max > maxsmap) {
stack_rlim.rlim_max = newrlim->rlim_max;
newrlim->rlim_max = maxsmap;
}
}
/*
* Stack is allocated to the max at exec time with only
* "rlim_cur" bytes accessible. If stack limit is going
* up make more accessible, if going down make inaccessible.
*/
if (newrlim->rlim_cur > rlim.rlim_cur) {
mach_vm_offset_t addr;
mach_vm_size_t size;
/* grow stack */
size = newrlim->rlim_cur;
if (round_page_overflow(size, &size)) {
error = EINVAL;
goto out;
}
size -= round_page_64(rlim.rlim_cur);
addr = (mach_vm_offset_t)(p->user_stack - round_page_64(newrlim->rlim_cur));
kr = mach_vm_protect(current_map(), addr, size, FALSE, VM_PROT_DEFAULT);
if (kr != KERN_SUCCESS) {
error = EINVAL;
goto out;
}
} else if (newrlim->rlim_cur < rlim.rlim_cur) {
mach_vm_offset_t addr;
mach_vm_size_t size;
uint64_t cur_sp;
/* shrink stack */
/*
* First check if new stack limit would agree
* with current stack usage.
* Get the current thread's stack pointer...
*/
cur_sp = thread_adjuserstack(current_thread(), 0);
if (cur_sp <= p->user_stack &&
cur_sp > (p->user_stack - round_page_64(rlim.rlim_cur))) {
/* stack pointer is in main stack */
if (cur_sp <= (p->user_stack - round_page_64(newrlim->rlim_cur))) {
/*
* New limit would cause current usage to be invalid:
* reject new limit.
*/
error = EINVAL;
goto out;
}
} else {
/* not on the main stack: reject */
error = EINVAL;
goto out;
}
size = round_page_64(rlim.rlim_cur);
size -= round_page_64(rlim.rlim_cur);
addr = (mach_vm_offset_t)(p->user_stack - round_page_64(rlim.rlim_cur));
kr = mach_vm_protect(current_map(), addr, size, FALSE, VM_PROT_NONE);
if (kr != KERN_SUCCESS) {
error = EINVAL;
goto out;
}
} else {
/* no change ... */
}
/*
* We've adjusted the process's stack region. If the user-defined limit is greater
* than maxsmap, we need to reflect this change in rlimit interface.
*/
if (stack_rlim.rlim_cur != 0) {
newrlim->rlim_cur = stack_rlim.rlim_cur;
}
if (stack_rlim.rlim_max != 0) {
newrlim->rlim_max = stack_rlim.rlim_max;
}
break;
case RLIMIT_NOFILE:
/*
* Nothing to be done here as we already performed the sanity checks before entering the switch code block.
* The real NOFILE limits enforced by the kernel is capped at MIN(RLIMIT_NOFILE, maxfilesperproc)
*/
break;
case RLIMIT_AS:
/* Over to Mach VM to validate the new address space limit */
if (vm_map_set_size_limit(current_map(), newrlim->rlim_cur) != KERN_SUCCESS) {
/* The limit specified cannot be lowered because current usage is already higher than the limit. */
error = EINVAL;
goto out;
}
break;
case RLIMIT_NPROC:
/*
* Only root can set to the maxproc limits, as it is
* systemwide resource; all others are limited to
* maxprocperuid (presumably less than maxproc).
*/
if (kauth_cred_issuser(kauth_cred_get())) {
if (newrlim->rlim_cur > (rlim_t)maxproc) {
newrlim->rlim_cur = maxproc;
}
if (newrlim->rlim_max > (rlim_t)maxproc) {
newrlim->rlim_max = maxproc;
}
} else {
if (newrlim->rlim_cur > (rlim_t)maxprocperuid) {
newrlim->rlim_cur = maxprocperuid;
}
if (newrlim->rlim_max > (rlim_t)maxprocperuid) {
newrlim->rlim_max = maxprocperuid;
}
}
break;
case RLIMIT_MEMLOCK:
/*
* Tell the Mach VM layer about the new limit value.
*/
newrlim->rlim_cur = (vm_size_t)newrlim->rlim_cur;
vm_map_set_user_wire_limit(current_map(), (vm_size_t)newrlim->rlim_cur);
break;
} /* switch... */
/* Everything checks out and we are now ready to update the rlimit */
error = 0;
out:
if (error == 0) {
/*
* COW the current plimit if it's shared, otherwise update it in place.
* Finally unblock other threads wishing to change plimit.
*/
proc_limitupdate(p, true, ^(struct plimit *plim) {
plim->pl_rlimit[which] = *newrlim;
});
} else {
/*
* This setrlimit has failed, just leave the plimit as is and unblock other
* threads wishing to change plimit.
*/
proc_lock(p);
proc_limitunblock(p);
proc_unlock(p);
}
return error;
}
/* ARGSUSED */
int
getrlimit(struct proc *p, struct getrlimit_args *uap, __unused int32_t *retval)
{
struct rlimit lim = {};
/*
* Take out flag now in case we need to use it to trigger variant
* behaviour later.
*/
uap->which &= ~_RLIMIT_POSIX_FLAG;
if (uap->which >= RLIM_NLIMITS) {
return EINVAL;
}
lim = proc_limitget(p, uap->which);
return copyout((caddr_t)&lim,
uap->rlp, sizeof(struct rlimit));
}
/*
* Transform the running time and tick information in proc p into user,
* system, and interrupt time usage.
*/
/* No lock on proc is held for this.. */
void
calcru(struct proc *p, struct timeval *up, struct timeval *sp, struct timeval *ip)
{
task_t task;
timerclear(up);
timerclear(sp);
if (ip != NULL) {
timerclear(ip);
}
task = proc_task(p);
if (task) {
mach_task_basic_info_data_t tinfo;
task_thread_times_info_data_t ttimesinfo;
task_events_info_data_t teventsinfo;
mach_msg_type_number_t task_info_count, task_ttimes_count;
mach_msg_type_number_t task_events_count;
struct timeval ut, st;
task_info_count = MACH_TASK_BASIC_INFO_COUNT;
task_info(task, MACH_TASK_BASIC_INFO,
(task_info_t)&tinfo, &task_info_count);
ut.tv_sec = tinfo.user_time.seconds;
ut.tv_usec = tinfo.user_time.microseconds;
st.tv_sec = tinfo.system_time.seconds;
st.tv_usec = tinfo.system_time.microseconds;
timeradd(&ut, up, up);
timeradd(&st, sp, sp);
task_ttimes_count = TASK_THREAD_TIMES_INFO_COUNT;
task_info(task, TASK_THREAD_TIMES_INFO,
(task_info_t)&ttimesinfo, &task_ttimes_count);
ut.tv_sec = ttimesinfo.user_time.seconds;
ut.tv_usec = ttimesinfo.user_time.microseconds;
st.tv_sec = ttimesinfo.system_time.seconds;
st.tv_usec = ttimesinfo.system_time.microseconds;
timeradd(&ut, up, up);
timeradd(&st, sp, sp);
task_events_count = TASK_EVENTS_INFO_COUNT;
task_info(task, TASK_EVENTS_INFO,
(task_info_t)&teventsinfo, &task_events_count);
/*
* No need to lock "p": this does not need to be
* completely consistent, right ?
*/
p->p_stats->p_ru.ru_minflt = (teventsinfo.faults -
teventsinfo.pageins);
p->p_stats->p_ru.ru_majflt = teventsinfo.pageins;
p->p_stats->p_ru.ru_nivcsw = (teventsinfo.csw -
p->p_stats->p_ru.ru_nvcsw);
if (p->p_stats->p_ru.ru_nivcsw < 0) {
p->p_stats->p_ru.ru_nivcsw = 0;
}
p->p_stats->p_ru.ru_maxrss = (long)tinfo.resident_size_max;
}
}
__private_extern__ void munge_user64_rusage(struct rusage *a_rusage_p, struct user64_rusage *a_user_rusage_p);
__private_extern__ void munge_user32_rusage(struct rusage *a_rusage_p, struct user32_rusage *a_user_rusage_p);
/* ARGSUSED */
int
getrusage(struct proc *p, struct getrusage_args *uap, __unused int32_t *retval)
{
struct rusage *rup, rubuf;
struct user64_rusage rubuf64 = {};
struct user32_rusage rubuf32 = {};
size_t retsize = sizeof(rubuf); /* default: 32 bits */
caddr_t retbuf = (caddr_t)&rubuf; /* default: 32 bits */
struct timeval utime;
struct timeval stime;
switch (uap->who) {
case RUSAGE_SELF:
calcru(p, &utime, &stime, NULL);
proc_lock(p);
rup = &p->p_stats->p_ru;
rup->ru_utime = utime;
rup->ru_stime = stime;
rubuf = *rup;
proc_unlock(p);
break;
case RUSAGE_CHILDREN:
proc_lock(p);
rup = &p->p_stats->p_cru;
rubuf = *rup;
proc_unlock(p);
break;
default:
return EINVAL;
}
if (IS_64BIT_PROCESS(p)) {
retsize = sizeof(rubuf64);
retbuf = (caddr_t)&rubuf64;
munge_user64_rusage(&rubuf, &rubuf64);
} else {
retsize = sizeof(rubuf32);
retbuf = (caddr_t)&rubuf32;
munge_user32_rusage(&rubuf, &rubuf32);
}
return copyout(retbuf, uap->rusage, retsize);
}
void
ruadd(struct rusage *ru, struct rusage *ru2)
{
long *ip, *ip2;
long i;
timeradd(&ru->ru_utime, &ru2->ru_utime, &ru->ru_utime);
timeradd(&ru->ru_stime, &ru2->ru_stime, &ru->ru_stime);
if (ru->ru_maxrss < ru2->ru_maxrss) {
ru->ru_maxrss = ru2->ru_maxrss;
}
ip = &ru->ru_first; ip2 = &ru2->ru_first;
for (i = &ru->ru_last - &ru->ru_first; i >= 0; i--) {
*ip++ += *ip2++;
}
}
/*
* Add the rusage stats of child in parent.
*
* It adds rusage statistics of child process and statistics of all its
* children to its parent.
*
* Note: proc lock of parent should be held while calling this function.
*/
void
update_rusage_info_child(struct rusage_info_child *ri, rusage_info_current *ri_current)
{
ri->ri_child_user_time += (ri_current->ri_user_time +
ri_current->ri_child_user_time);
ri->ri_child_system_time += (ri_current->ri_system_time +
ri_current->ri_child_system_time);
ri->ri_child_pkg_idle_wkups += (ri_current->ri_pkg_idle_wkups +
ri_current->ri_child_pkg_idle_wkups);
ri->ri_child_interrupt_wkups += (ri_current->ri_interrupt_wkups +
ri_current->ri_child_interrupt_wkups);
ri->ri_child_pageins += (ri_current->ri_pageins +
ri_current->ri_child_pageins);
ri->ri_child_elapsed_abstime += ((ri_current->ri_proc_exit_abstime -
ri_current->ri_proc_start_abstime) + ri_current->ri_child_elapsed_abstime);
}
static void
proc_limit_free(smr_node_t node)
{
struct plimit *plimit = __container_of(node, struct plimit, pl_node);
zfree(plimit_zone, plimit);
}
static void
proc_limit_release(struct plimit *plimit)
{
if (os_ref_release(&plimit->pl_refcnt) == 0) {
smr_proc_task_call(&plimit->pl_node, sizeof(*plimit), proc_limit_free);
}
}
/*
* Reading soft limit from specified resource.
*/
rlim_t
proc_limitgetcur(proc_t p, int which)
{
rlim_t rlim_cur;
assert(p);
assert(which < RLIM_NLIMITS);
smr_proc_task_enter();
rlim_cur = smr_entered_load(&p->p_limit)->pl_rlimit[which].rlim_cur;
smr_proc_task_leave();
return rlim_cur;
}
/*
* Handle commonly asked limit that needs to be clamped with maxfilesperproc.
*/
int
proc_limitgetcur_nofile(struct proc *p)
{
rlim_t lim = proc_limitgetcur(p, RLIMIT_NOFILE);
return (int)MIN(lim, maxfilesperproc);
}
/*
* Writing soft limit to specified resource. This is an internal function
* used only by proc_exit to update RLIMIT_FSIZE in
* place without invoking setrlimit.
*/
void
proc_limitsetcur_fsize(proc_t p, rlim_t value)
{
proc_limitupdate(p, false, ^(struct plimit *plimit) {
plimit->pl_rlimit[RLIMIT_FSIZE].rlim_cur = value;
});
}
struct rlimit
proc_limitget(proc_t p, int which)
{
struct rlimit lim;
assert(which < RLIM_NLIMITS);
smr_proc_task_enter();
lim = smr_entered_load(&p->p_limit)->pl_rlimit[which];
smr_proc_task_leave();
return lim;
}
void
proc_limitfork(proc_t parent, proc_t child)
{
struct plimit *plim;
proc_lock(parent);
plim = smr_serialized_load(&parent->p_limit);
os_ref_retain(&plim->pl_refcnt);
proc_unlock(parent);
smr_init_store(&child->p_limit, plim);
}
void
proc_limitdrop(proc_t p)
{
struct plimit *plimit = NULL;
proc_lock(p);
plimit = smr_serialized_load(&p->p_limit);
smr_clear_store(&p->p_limit);
proc_unlock(p);
proc_limit_release(plimit);
}
/*
* proc_limitblock/unblock are used to serialize access to plimit
* from concurrent threads within the same process.
* Callers must be holding the proc lock to enter, return with
* the proc lock locked
*/
static void
proc_limitblock(proc_t p)
{
lck_mtx_assert(&p->p_mlock, LCK_MTX_ASSERT_OWNED);
while (p->p_lflag & P_LLIMCHANGE) {
p->p_lflag |= P_LLIMWAIT;
msleep(&p->p_limit, &p->p_mlock, 0, "proc_limitblock", NULL);
}
p->p_lflag |= P_LLIMCHANGE;
}
/*
* Callers must be holding the proc lock to enter, return with
* the proc lock locked
*/
static void
proc_limitunblock(proc_t p)
{
lck_mtx_assert(&p->p_mlock, LCK_MTX_ASSERT_OWNED);
p->p_lflag &= ~P_LLIMCHANGE;
if (p->p_lflag & P_LLIMWAIT) {
p->p_lflag &= ~P_LLIMWAIT;
wakeup(&p->p_limit);
}
}
/*
* Perform an rlimit update (as defined by the arbitrary `update` function).
*
* Because plimits are accessed without holding any locks,
* with only a hazard reference, the struct plimit is always
* copied, updated, and replaced, to implement a const value type.
*/
static void
proc_limitupdate(proc_t p, bool unblock, void (^update)(struct plimit *))
{
struct plimit *cur_plim;
struct plimit *copy_plim;
copy_plim = zalloc_flags(plimit_zone, Z_WAITOK | Z_ZERO | Z_NOFAIL);
proc_lock(p);
cur_plim = smr_serialized_load(&p->p_limit);
os_ref_init_count(&copy_plim->pl_refcnt, &rlimit_refgrp, 1);
bcopy(cur_plim->pl_rlimit, copy_plim->pl_rlimit,
sizeof(struct rlimit) * RLIM_NLIMITS);
update(copy_plim);
smr_serialized_store(&p->p_limit, copy_plim);
if (unblock) {
proc_limitunblock(p);
}
proc_unlock(p);
proc_limit_release(cur_plim);
}
static int
iopolicysys_disk(struct proc *p, int cmd, int scope, int policy, struct _iopol_param_t *iop_param);
static int
iopolicysys_vfs_hfs_case_sensitivity(struct proc *p, int cmd, int scope, int policy, struct _iopol_param_t *iop_param);
static int
iopolicysys_vfs_atime_updates(struct proc *p, int cmd, int scope, int policy, struct _iopol_param_t *iop_param);
static int
iopolicysys_vfs_statfs_no_data_volume(struct proc *p, int cmd, int scope, int policy, struct _iopol_param_t *iop_param);
static int
iopolicysys_vfs_trigger_resolve(struct proc *p, int cmd, int scope, int policy, struct _iopol_param_t *iop_param);
static int
iopolicysys_vfs_ignore_content_protection(struct proc *p, int cmd, int scope, int policy, struct _iopol_param_t *iop_param);
static int
iopolicysys_vfs_ignore_node_permissions(struct proc *p, int cmd, int scope, int policy, struct _iopol_param_t *ipo_param);
static int
iopolicysys_vfs_skip_mtime_update(struct proc *p, int cmd, int scope, int policy, struct _iopol_param_t *iop_param);
static int
iopolicysys_vfs_allow_lowspace_writes(struct proc *p, int cmd, int scope, int policy, struct _iopol_param_t *iop_param);
static int
iopolicysys_vfs_disallow_rw_for_o_evtonly(struct proc *p, int cmd, int scope, int policy, struct _iopol_param_t *iop_param);
static int iopolicysys_vfs_altlink(struct proc *p, int cmd, int scope, int policy, struct _iopol_param_t *iop_param);
static int iopolicysys_vfs_nocache_write_fs_blksize(struct proc *p, int cmd, int scope, int policy, struct _iopol_param_t *iop_param);
/*
* iopolicysys
*
* Description: System call MUX for use in manipulating I/O policy attributes of the current process or thread
*
* Parameters: cmd Policy command
* arg Pointer to policy arguments
*
* Returns: 0 Success
* EINVAL Invalid command or invalid policy arguments
*
*/
int
iopolicysys(struct proc *p, struct iopolicysys_args *uap, int32_t *retval)
{
int error = 0;
struct _iopol_param_t iop_param;
if ((error = copyin(uap->arg, &iop_param, sizeof(iop_param))) != 0) {
goto out;
}
switch (iop_param.iop_iotype) {
case IOPOL_TYPE_DISK:
error = iopolicysys_disk(p, uap->cmd, iop_param.iop_scope, iop_param.iop_policy, &iop_param);
if (error == EIDRM) {
*retval = -2;
error = 0;
}
if (error) {
goto out;
}
break;
case IOPOL_TYPE_VFS_HFS_CASE_SENSITIVITY:
error = iopolicysys_vfs_hfs_case_sensitivity(p, uap->cmd, iop_param.iop_scope, iop_param.iop_policy, &iop_param);
if (error) {
goto out;
}
break;
case IOPOL_TYPE_VFS_ATIME_UPDATES:
error = iopolicysys_vfs_atime_updates(p, uap->cmd, iop_param.iop_scope, iop_param.iop_policy, &iop_param);
if (error) {
goto out;
}
break;
case IOPOL_TYPE_VFS_MATERIALIZE_DATALESS_FILES:
error = iopolicysys_vfs_materialize_dataless_files(p, uap->cmd, iop_param.iop_scope, iop_param.iop_policy, &iop_param);
if (error) {
goto out;
}
break;
case IOPOL_TYPE_VFS_STATFS_NO_DATA_VOLUME:
error = iopolicysys_vfs_statfs_no_data_volume(p, uap->cmd, iop_param.iop_scope, iop_param.iop_policy, &iop_param);
if (error) {
goto out;
}
break;
case IOPOL_TYPE_VFS_TRIGGER_RESOLVE:
error = iopolicysys_vfs_trigger_resolve(p, uap->cmd, iop_param.iop_scope, iop_param.iop_policy, &iop_param);
if (error) {
goto out;
}
break;
case IOPOL_TYPE_VFS_IGNORE_CONTENT_PROTECTION:
error = iopolicysys_vfs_ignore_content_protection(p, uap->cmd, iop_param.iop_scope, iop_param.iop_policy, &iop_param);
if (error) {
goto out;
}
break;
case IOPOL_TYPE_VFS_IGNORE_PERMISSIONS:
error = iopolicysys_vfs_ignore_node_permissions(p, uap->cmd, iop_param.iop_scope, iop_param.iop_policy, &iop_param);
if (error) {
goto out;
}
break;
case IOPOL_TYPE_VFS_SKIP_MTIME_UPDATE:
error = iopolicysys_vfs_skip_mtime_update(p, uap->cmd, iop_param.iop_scope, iop_param.iop_policy, &iop_param);
if (error) {
goto out;
}
break;
case IOPOL_TYPE_VFS_ALLOW_LOW_SPACE_WRITES:
error = iopolicysys_vfs_allow_lowspace_writes(p, uap->cmd, iop_param.iop_scope, iop_param.iop_policy, &iop_param);
if (error) {
goto out;
}
break;
case IOPOL_TYPE_VFS_DISALLOW_RW_FOR_O_EVTONLY:
error = iopolicysys_vfs_disallow_rw_for_o_evtonly(p, uap->cmd, iop_param.iop_scope, iop_param.iop_policy, &iop_param);
if (error) {
goto out;
}
break;
case IOPOL_TYPE_VFS_ALTLINK:
error = iopolicysys_vfs_altlink(p, uap->cmd, iop_param.iop_scope, iop_param.iop_policy, &iop_param);
if (error) {
goto out;
}
break;
case IOPOL_TYPE_VFS_NOCACHE_WRITE_FS_BLKSIZE:
error = iopolicysys_vfs_nocache_write_fs_blksize(p, uap->cmd, iop_param.iop_scope, iop_param.iop_policy, &iop_param);
if (error) {
goto out;
}
break;
default:
error = EINVAL;
goto out;
}
/* Individual iotype handlers are expected to update iop_param, if requested with a GET command */
if (uap->cmd == IOPOL_CMD_GET) {
error = copyout((caddr_t)&iop_param, uap->arg, sizeof(iop_param));
if (error) {
goto out;
}
}
out:
return error;
}
static int
iopolicysys_disk(struct proc *p __unused, int cmd, int scope, int policy, struct _iopol_param_t *iop_param)
{
int error = 0;
thread_t thread;
int policy_flavor;
/* Validate scope */
switch (scope) {
case IOPOL_SCOPE_PROCESS:
thread = THREAD_NULL;
policy_flavor = TASK_POLICY_IOPOL;
break;
case IOPOL_SCOPE_THREAD:
thread = current_thread();
policy_flavor = TASK_POLICY_IOPOL;
/* Not allowed to combine QoS and (non-PASSIVE) IO policy, doing so strips the QoS */
if (cmd == IOPOL_CMD_SET && thread_has_qos_policy(thread)) {
switch (policy) {
case IOPOL_DEFAULT:
case IOPOL_PASSIVE:
break;
case IOPOL_UTILITY:
case IOPOL_THROTTLE:
case IOPOL_IMPORTANT:
case IOPOL_STANDARD:
if (!thread_is_static_param(thread)) {
thread_remove_qos_policy(thread);
/*
* This is not an error case, this is to return a marker to user-space that
* we stripped the thread of its QoS class.
*/
error = EIDRM;
break;
}
OS_FALLTHROUGH;
default:
error = EINVAL;
goto out;
}
}
break;
case IOPOL_SCOPE_DARWIN_BG:
#if !defined(XNU_TARGET_OS_OSX)
/* We don't want this on platforms outside of macOS as BG is always IOPOL_THROTTLE */
error = ENOTSUP;
goto out;
#else /* !defined(XNU_TARGET_OS_OSX) */
thread = THREAD_NULL;
policy_flavor = TASK_POLICY_DARWIN_BG_IOPOL;
break;
#endif /* !defined(XNU_TARGET_OS_OSX) */
default:
error = EINVAL;
goto out;
}
/* Validate policy */
if (cmd == IOPOL_CMD_SET) {
switch (policy) {
case IOPOL_DEFAULT:
if (scope == IOPOL_SCOPE_DARWIN_BG) {
/* the current default BG throttle level is UTILITY */
policy = IOPOL_UTILITY;
} else {
policy = IOPOL_IMPORTANT;
}
break;
case IOPOL_UTILITY:
/* fall-through */
case IOPOL_THROTTLE:
/* These levels are OK */
break;
case IOPOL_IMPORTANT:
/* fall-through */
case IOPOL_STANDARD:
/* fall-through */
case IOPOL_PASSIVE:
if (scope == IOPOL_SCOPE_DARWIN_BG) {
/* These levels are invalid for BG */
error = EINVAL;
goto out;
} else {
/* OK for other scopes */
}
break;
default:
error = EINVAL;
goto out;
}
}
/* Perform command */
switch (cmd) {
case IOPOL_CMD_SET:
if (thread != THREAD_NULL) {
proc_set_thread_policy(thread, TASK_POLICY_INTERNAL, policy_flavor, policy);
} else {
proc_set_task_policy(current_task(), TASK_POLICY_INTERNAL, policy_flavor, policy);
}
break;
case IOPOL_CMD_GET:
if (thread != THREAD_NULL) {
policy = proc_get_thread_policy(thread, TASK_POLICY_INTERNAL, policy_flavor);
} else {
policy = proc_get_task_policy(current_task(), TASK_POLICY_INTERNAL, policy_flavor);
}
iop_param->iop_policy = policy;
break;
default:
error = EINVAL; /* unknown command */
break;
}
out:
return error;
}
static int
iopolicysys_vfs_hfs_case_sensitivity(struct proc *p, int cmd, int scope, int policy, struct _iopol_param_t *iop_param)
{
int error = 0;
/* Validate scope */
switch (scope) {
case IOPOL_SCOPE_PROCESS:
/* Only process OK */
break;
default:
error = EINVAL;
goto out;
}
/* Validate policy */
if (cmd == IOPOL_CMD_SET) {
switch (policy) {
case IOPOL_VFS_HFS_CASE_SENSITIVITY_DEFAULT:
/* fall-through */
case IOPOL_VFS_HFS_CASE_SENSITIVITY_FORCE_CASE_SENSITIVE:
/* These policies are OK */
break;
default:
error = EINVAL;
goto out;
}
}
/* Perform command */
switch (cmd) {
case IOPOL_CMD_SET:
if (0 == kauth_cred_issuser(kauth_cred_get())) {
/* If it's a non-root process, it needs to have the entitlement to set the policy */
boolean_t entitled = FALSE;
entitled = IOCurrentTaskHasEntitlement("com.apple.private.iopol.case_sensitivity");
if (!entitled) {
error = EPERM;
goto out;
}
}
switch (policy) {
case IOPOL_VFS_HFS_CASE_SENSITIVITY_DEFAULT:
OSBitAndAtomic16(~((uint32_t)P_VFS_IOPOLICY_FORCE_HFS_CASE_SENSITIVITY), &p->p_vfs_iopolicy);
break;
case IOPOL_VFS_HFS_CASE_SENSITIVITY_FORCE_CASE_SENSITIVE:
OSBitOrAtomic16((uint32_t)P_VFS_IOPOLICY_FORCE_HFS_CASE_SENSITIVITY, &p->p_vfs_iopolicy);
break;
default:
error = EINVAL;
goto out;
}
break;
case IOPOL_CMD_GET:
iop_param->iop_policy = (p->p_vfs_iopolicy & P_VFS_IOPOLICY_FORCE_HFS_CASE_SENSITIVITY)
? IOPOL_VFS_HFS_CASE_SENSITIVITY_FORCE_CASE_SENSITIVE
: IOPOL_VFS_HFS_CASE_SENSITIVITY_DEFAULT;
break;
default:
error = EINVAL; /* unknown command */
break;
}
out:
return error;
}
static inline int
get_thread_atime_policy(struct uthread *ut)
{
return (ut->uu_flag & UT_ATIME_UPDATE) ? IOPOL_ATIME_UPDATES_OFF : IOPOL_ATIME_UPDATES_DEFAULT;
}
static inline void
set_thread_atime_policy(struct uthread *ut, int policy)
{
if (policy == IOPOL_ATIME_UPDATES_OFF) {
ut->uu_flag |= UT_ATIME_UPDATE;
} else {
ut->uu_flag &= ~UT_ATIME_UPDATE;
}
}
static inline void
set_task_atime_policy(struct proc *p, int policy)
{
if (policy == IOPOL_ATIME_UPDATES_OFF) {
OSBitOrAtomic16((uint16_t)P_VFS_IOPOLICY_ATIME_UPDATES, &p->p_vfs_iopolicy);
} else {
OSBitAndAtomic16(~((uint16_t)P_VFS_IOPOLICY_ATIME_UPDATES), &p->p_vfs_iopolicy);
}
}
static inline int
get_task_atime_policy(struct proc *p)
{
return (p->p_vfs_iopolicy & P_VFS_IOPOLICY_ATIME_UPDATES) ? IOPOL_ATIME_UPDATES_OFF : IOPOL_ATIME_UPDATES_DEFAULT;
}
static int
iopolicysys_vfs_atime_updates(struct proc *p __unused, int cmd, int scope, int policy, struct _iopol_param_t *iop_param)
{
int error = 0;
thread_t thread;
/* Validate scope */
switch (scope) {
case IOPOL_SCOPE_THREAD:
thread = current_thread();
break;
case IOPOL_SCOPE_PROCESS:
thread = THREAD_NULL;
break;
default:
error = EINVAL;
goto out;
}
/* Validate policy */
if (cmd == IOPOL_CMD_SET) {
switch (policy) {
case IOPOL_ATIME_UPDATES_DEFAULT:
case IOPOL_ATIME_UPDATES_OFF:
break;
default:
error = EINVAL;
goto out;
}
}
/* Perform command */
switch (cmd) {
case IOPOL_CMD_SET:
if (thread != THREAD_NULL) {
set_thread_atime_policy(get_bsdthread_info(thread), policy);
} else {
set_task_atime_policy(p, policy);
}
break;
case IOPOL_CMD_GET:
if (thread != THREAD_NULL) {
policy = get_thread_atime_policy(get_bsdthread_info(thread));
} else {
policy = get_task_atime_policy(p);
}
iop_param->iop_policy = policy;
break;
default:
error = EINVAL; /* unknown command */
break;
}
out:
return error;
}
static inline int
get_thread_materialize_policy(struct uthread *ut)
{
if (ut->uu_flag & UT_NSPACE_NODATALESSFAULTS) {
return IOPOL_MATERIALIZE_DATALESS_FILES_OFF;
} else if (ut->uu_flag & UT_NSPACE_FORCEDATALESSFAULTS) {
return IOPOL_MATERIALIZE_DATALESS_FILES_ON;
}
/* Default thread behavior is "inherit process behavior". */
return IOPOL_MATERIALIZE_DATALESS_FILES_DEFAULT;
}
static inline void
set_thread_materialize_policy(struct uthread *ut, int policy)
{
if (policy == IOPOL_MATERIALIZE_DATALESS_FILES_OFF) {
ut->uu_flag &= ~UT_NSPACE_FORCEDATALESSFAULTS;
ut->uu_flag |= UT_NSPACE_NODATALESSFAULTS;
} else if (policy == IOPOL_MATERIALIZE_DATALESS_FILES_ON) {
ut->uu_flag &= ~UT_NSPACE_NODATALESSFAULTS;
ut->uu_flag |= UT_NSPACE_FORCEDATALESSFAULTS;
} else {
ut->uu_flag &= ~(UT_NSPACE_NODATALESSFAULTS | UT_NSPACE_FORCEDATALESSFAULTS);
}
}
static inline void
set_proc_materialize_policy(struct proc *p, int policy)
{
if (policy == IOPOL_MATERIALIZE_DATALESS_FILES_DEFAULT) {
/*
* Caller has specified "use the default policy".
* The default policy is to NOT materialize dataless
* files.
*/
policy = IOPOL_MATERIALIZE_DATALESS_FILES_OFF;
}
if (policy == IOPOL_MATERIALIZE_DATALESS_FILES_ON) {
OSBitOrAtomic16((uint16_t)P_VFS_IOPOLICY_MATERIALIZE_DATALESS_FILES, &p->p_vfs_iopolicy);
} else {
OSBitAndAtomic16(~((uint16_t)P_VFS_IOPOLICY_MATERIALIZE_DATALESS_FILES), &p->p_vfs_iopolicy);
}
}
static int
get_proc_materialize_policy(struct proc *p)
{
return (p->p_vfs_iopolicy & P_VFS_IOPOLICY_MATERIALIZE_DATALESS_FILES) ? IOPOL_MATERIALIZE_DATALESS_FILES_ON : IOPOL_MATERIALIZE_DATALESS_FILES_OFF;
}
int
iopolicysys_vfs_materialize_dataless_files(struct proc *p __unused, int cmd, int scope, int policy, struct _iopol_param_t *iop_param)
{
int error = 0;
thread_t thread;
/* Validate scope */
switch (scope) {
case IOPOL_SCOPE_THREAD:
thread = current_thread();
break;
case IOPOL_SCOPE_PROCESS:
thread = THREAD_NULL;
break;
default:
error = EINVAL;
goto out;
}
/* Validate policy */
if (cmd == IOPOL_CMD_SET) {
switch (policy) {
case IOPOL_MATERIALIZE_DATALESS_FILES_DEFAULT:
case IOPOL_MATERIALIZE_DATALESS_FILES_OFF:
case IOPOL_MATERIALIZE_DATALESS_FILES_ON:
break;
default:
error = EINVAL;
goto out;
}
}
/* Perform command */
switch (cmd) {
case IOPOL_CMD_SET:
if (thread != THREAD_NULL) {
set_thread_materialize_policy(get_bsdthread_info(thread), policy);
} else {
set_proc_materialize_policy(p, policy);
}
break;
case IOPOL_CMD_GET:
if (thread != THREAD_NULL) {
policy = get_thread_materialize_policy(get_bsdthread_info(thread));
} else {
policy = get_proc_materialize_policy(p);
}
iop_param->iop_policy = policy;
break;
default:
error = EINVAL; /* unknown command */
break;
}
out:
return error;
}
static int
iopolicysys_vfs_statfs_no_data_volume(struct proc *p __unused, int cmd,
int scope, int policy, struct _iopol_param_t *iop_param)
{
int error = 0;
/* Validate scope */
switch (scope) {
case IOPOL_SCOPE_PROCESS:
/* Only process OK */
break;
default:
error = EINVAL;
goto out;
}
/* Validate policy */
if (cmd == IOPOL_CMD_SET) {
switch (policy) {
case IOPOL_VFS_STATFS_NO_DATA_VOLUME_DEFAULT:
/* fall-through */
case IOPOL_VFS_STATFS_FORCE_NO_DATA_VOLUME:
/* These policies are OK */
break;
default:
error = EINVAL;
goto out;
}
}
/* Perform command */
switch (cmd) {
case IOPOL_CMD_SET:
if (0 == kauth_cred_issuser(kauth_cred_get())) {
/* If it's a non-root process, it needs to have the entitlement to set the policy */
boolean_t entitled = FALSE;
entitled = IOCurrentTaskHasEntitlement("com.apple.private.iopol.case_sensitivity");
if (!entitled) {
error = EPERM;
goto out;
}
}
switch (policy) {
case IOPOL_VFS_STATFS_NO_DATA_VOLUME_DEFAULT:
OSBitAndAtomic16(~((uint32_t)P_VFS_IOPOLICY_STATFS_NO_DATA_VOLUME), &p->p_vfs_iopolicy);
break;
case IOPOL_VFS_STATFS_FORCE_NO_DATA_VOLUME:
OSBitOrAtomic16((uint32_t)P_VFS_IOPOLICY_STATFS_NO_DATA_VOLUME, &p->p_vfs_iopolicy);
break;
default:
error = EINVAL;
goto out;
}
break;
case IOPOL_CMD_GET:
iop_param->iop_policy = (p->p_vfs_iopolicy & P_VFS_IOPOLICY_STATFS_NO_DATA_VOLUME)
? IOPOL_VFS_STATFS_FORCE_NO_DATA_VOLUME
: IOPOL_VFS_STATFS_NO_DATA_VOLUME_DEFAULT;
break;
default:
error = EINVAL; /* unknown command */
break;
}
out:
return error;
}
static int
iopolicysys_vfs_trigger_resolve(struct proc *p __unused, int cmd,
int scope, int policy, struct _iopol_param_t *iop_param)
{
int error = 0;
/* Validate scope */
switch (scope) {
case IOPOL_SCOPE_PROCESS:
/* Only process OK */
break;
default:
error = EINVAL;
goto out;
}
/* Validate policy */
if (cmd == IOPOL_CMD_SET) {
switch (policy) {
case IOPOL_VFS_TRIGGER_RESOLVE_DEFAULT:
/* fall-through */
case IOPOL_VFS_TRIGGER_RESOLVE_OFF:
/* These policies are OK */
break;
default:
error = EINVAL;
goto out;
}
}
/* Perform command */
switch (cmd) {
case IOPOL_CMD_SET:
switch (policy) {
case IOPOL_VFS_TRIGGER_RESOLVE_DEFAULT:
OSBitAndAtomic16(~((uint32_t)P_VFS_IOPOLICY_TRIGGER_RESOLVE_DISABLE), &p->p_vfs_iopolicy);
break;
case IOPOL_VFS_TRIGGER_RESOLVE_OFF:
OSBitOrAtomic16((uint32_t)P_VFS_IOPOLICY_TRIGGER_RESOLVE_DISABLE, &p->p_vfs_iopolicy);
break;
default:
error = EINVAL;
goto out;
}
break;
case IOPOL_CMD_GET:
iop_param->iop_policy = (p->p_vfs_iopolicy & P_VFS_IOPOLICY_TRIGGER_RESOLVE_DISABLE)
? IOPOL_VFS_TRIGGER_RESOLVE_OFF
: IOPOL_VFS_TRIGGER_RESOLVE_DEFAULT;
break;
default:
error = EINVAL; /* unknown command */
break;
}
out:
return error;
}
static int
iopolicysys_vfs_ignore_content_protection(struct proc *p, int cmd, int scope,
int policy, struct _iopol_param_t *iop_param)
{
int error = 0;
/* Validate scope */
switch (scope) {
case IOPOL_SCOPE_PROCESS:
/* Only process OK */
break;
default:
error = EINVAL;
goto out;
}
/* Validate policy */
if (cmd == IOPOL_CMD_SET) {
switch (policy) {
case IOPOL_VFS_CONTENT_PROTECTION_DEFAULT:
OS_FALLTHROUGH;
case IOPOL_VFS_CONTENT_PROTECTION_IGNORE:
/* These policies are OK */
break;
default:
error = EINVAL;
goto out;
}
}
/* Perform command */
switch (cmd) {
case IOPOL_CMD_SET:
if (0 == kauth_cred_issuser(kauth_cred_get())) {
/* If it's a non-root process, it needs to have the entitlement to set the policy */
boolean_t entitled = FALSE;
entitled = IOCurrentTaskHasEntitlement("com.apple.private.iopol.case_sensitivity");
if (!entitled) {
error = EPERM;
goto out;
}
}
switch (policy) {
case IOPOL_VFS_CONTENT_PROTECTION_DEFAULT:
os_atomic_andnot(&p->p_vfs_iopolicy, P_VFS_IOPOLICY_IGNORE_CONTENT_PROTECTION, relaxed);
break;
case IOPOL_VFS_CONTENT_PROTECTION_IGNORE:
os_atomic_or(&p->p_vfs_iopolicy, P_VFS_IOPOLICY_IGNORE_CONTENT_PROTECTION, relaxed);
break;
default:
error = EINVAL;
goto out;
}
break;
case IOPOL_CMD_GET:
iop_param->iop_policy = (os_atomic_load(&p->p_vfs_iopolicy, relaxed) & P_VFS_IOPOLICY_IGNORE_CONTENT_PROTECTION)
? IOPOL_VFS_CONTENT_PROTECTION_IGNORE
: IOPOL_VFS_CONTENT_PROTECTION_DEFAULT;
break;
default:
error = EINVAL; /* unknown command */
break;
}
out:
return error;
}
#define AUTHORIZED_ACCESS_ENTITLEMENT \
"com.apple.private.vfs.authorized-access"
int
iopolicysys_vfs_ignore_node_permissions(struct proc *p, int cmd, int scope,
int policy, __unused struct _iopol_param_t *iop_param)
{
int error = EINVAL;
switch (scope) {
case IOPOL_SCOPE_PROCESS:
break;
default:
goto out;
}
switch (cmd) {
case IOPOL_CMD_GET:
policy = os_atomic_load(&p->p_vfs_iopolicy, relaxed) & P_VFS_IOPOLICY_IGNORE_NODE_PERMISSIONS ?
IOPOL_VFS_IGNORE_PERMISSIONS_ON : IOPOL_VFS_IGNORE_PERMISSIONS_OFF;
iop_param->iop_policy = policy;
goto out_ok;
case IOPOL_CMD_SET:
/* SET is handled after the switch */
break;
default:
goto out;
}
if (!IOCurrentTaskHasEntitlement(AUTHORIZED_ACCESS_ENTITLEMENT)) {
error = EPERM;
goto out;
}
switch (policy) {
case IOPOL_VFS_IGNORE_PERMISSIONS_OFF:
os_atomic_andnot(&p->p_vfs_iopolicy, P_VFS_IOPOLICY_IGNORE_NODE_PERMISSIONS, relaxed);
break;
case IOPOL_VFS_IGNORE_PERMISSIONS_ON:
os_atomic_or(&p->p_vfs_iopolicy, P_VFS_IOPOLICY_IGNORE_NODE_PERMISSIONS, relaxed);
break;
default:
break;
}
out_ok:
error = 0;
out:
return error;
}
#define SKIP_MTIME_UPDATE_ENTITLEMENT \
"com.apple.private.vfs.skip-mtime-updates"
int
iopolicysys_vfs_skip_mtime_update(struct proc *p, int cmd, int scope,
int policy, __unused struct _iopol_param_t *iop_param)
{
int error = EINVAL;
switch (scope) {
case IOPOL_SCOPE_PROCESS:
break;
default:
goto out;
}
switch (cmd) {
case IOPOL_CMD_GET:
policy = os_atomic_load(&p->p_vfs_iopolicy, relaxed) & P_VFS_IOPOLICY_SKIP_MTIME_UPDATE ?
IOPOL_VFS_SKIP_MTIME_UPDATE_ON : IOPOL_VFS_SKIP_MTIME_UPDATE_OFF;
iop_param->iop_policy = policy;
goto out_ok;
case IOPOL_CMD_SET:
break;
default:
break;
}
if (!IOCurrentTaskHasEntitlement(SKIP_MTIME_UPDATE_ENTITLEMENT)) {
error = EPERM;
goto out;
}
switch (policy) {
case IOPOL_VFS_SKIP_MTIME_UPDATE_OFF:
os_atomic_andnot(&p->p_vfs_iopolicy, P_VFS_IOPOLICY_SKIP_MTIME_UPDATE, relaxed);
break;
case IOPOL_VFS_SKIP_MTIME_UPDATE_ON:
os_atomic_or(&p->p_vfs_iopolicy, P_VFS_IOPOLICY_SKIP_MTIME_UPDATE, relaxed);
break;
default:
break;
}
out_ok:
error = 0;
out:
return error;
}
#define ALLOW_LOW_SPACE_WRITES_ENTITLEMENT \
"com.apple.private.vfs.allow-low-space-writes"
static int
iopolicysys_vfs_allow_lowspace_writes(struct proc *p, int cmd, int scope,
int policy, __unused struct _iopol_param_t *iop_param)
{
int error = EINVAL;
switch (scope) {
case IOPOL_SCOPE_PROCESS:
break;
default:
goto out;
}
switch (cmd) {
case IOPOL_CMD_GET:
policy = os_atomic_load(&p->p_vfs_iopolicy, relaxed) & P_VFS_IOPOLICY_ALLOW_LOW_SPACE_WRITES ?
IOPOL_VFS_ALLOW_LOW_SPACE_WRITES_ON : IOPOL_VFS_ALLOW_LOW_SPACE_WRITES_OFF;
iop_param->iop_policy = policy;
goto out_ok;
case IOPOL_CMD_SET:
break;
default:
break;
}
if (!IOCurrentTaskHasEntitlement(ALLOW_LOW_SPACE_WRITES_ENTITLEMENT)) {
error = EPERM;
goto out;
}
switch (policy) {
case IOPOL_VFS_ALLOW_LOW_SPACE_WRITES_OFF:
os_atomic_andnot(&p->p_vfs_iopolicy, P_VFS_IOPOLICY_ALLOW_LOW_SPACE_WRITES, relaxed);
break;
case IOPOL_VFS_ALLOW_LOW_SPACE_WRITES_ON:
os_atomic_or(&p->p_vfs_iopolicy, P_VFS_IOPOLICY_ALLOW_LOW_SPACE_WRITES, relaxed);
break;
default:
break;
}
out_ok:
error = 0;
out:
return error;
}
static int
iopolicysys_vfs_disallow_rw_for_o_evtonly(struct proc *p, int cmd, int scope,
int policy, __unused struct _iopol_param_t *iop_param)
{
int error = EINVAL;
switch (scope) {
case IOPOL_SCOPE_PROCESS:
break;
default:
goto out;
}
switch (cmd) {
case IOPOL_CMD_GET:
policy = (os_atomic_load(&p->p_vfs_iopolicy, relaxed) &
P_VFS_IOPOLICY_DISALLOW_RW_FOR_O_EVTONLY) ?
IOPOL_VFS_DISALLOW_RW_FOR_O_EVTONLY_ON :
IOPOL_VFS_DISALLOW_RW_FOR_O_EVTONLY_DEFAULT;
iop_param->iop_policy = policy;
goto out_ok;
case IOPOL_CMD_SET:
break;
default:
goto out;
}
/* Once set, we don't allow the process to clear it. */
switch (policy) {
case IOPOL_VFS_DISALLOW_RW_FOR_O_EVTONLY_ON:
os_atomic_or(&p->p_vfs_iopolicy,
P_VFS_IOPOLICY_DISALLOW_RW_FOR_O_EVTONLY, relaxed);
break;
default:
goto out;
}
out_ok:
error = 0;
out:
return error;
}
static int
iopolicysys_vfs_altlink(struct proc *p, int cmd, int scope, int policy,
struct _iopol_param_t *iop_param)
{
if (scope != IOPOL_SCOPE_PROCESS) {
return EINVAL;
}
if (cmd == IOPOL_CMD_GET) {
policy = (os_atomic_load(&p->p_vfs_iopolicy, relaxed) & P_VFS_IOPOLICY_ALTLINK) ?
IOPOL_VFS_ALTLINK_ENABLED : IOPOL_VFS_ALTLINK_DISABLED;
iop_param->iop_policy = policy;
return 0;
}
/* Once set, we don't allow the process to clear it. */
if (policy == IOPOL_VFS_ALTLINK_ENABLED) {
os_atomic_or(&p->p_vfs_iopolicy, P_VFS_IOPOLICY_ALTLINK, relaxed);
return 0;
}
return EINVAL;
}
static int
iopolicysys_vfs_nocache_write_fs_blksize(struct proc *p, int cmd, int scope, int policy,
struct _iopol_param_t *iop_param)
{
thread_t thread;
switch (scope) {
case IOPOL_SCOPE_THREAD:
thread = current_thread();
break;
case IOPOL_SCOPE_PROCESS:
thread = THREAD_NULL;
break;
default:
return EINVAL;
}
if (cmd == IOPOL_CMD_GET) {
if (thread != THREAD_NULL) {
struct uthread *ut = get_bsdthread_info(thread);
policy = ut->uu_flag & UT_FS_BLKSIZE_NOCACHE_WRITES ?
IOPOL_VFS_NOCACHE_WRITE_FS_BLKSIZE_ON : IOPOL_VFS_NOCACHE_WRITE_FS_BLKSIZE_DEFAULT;
} else {
policy = (os_atomic_load(&p->p_vfs_iopolicy, relaxed) & P_VFS_IOPOLICY_NOCACHE_WRITE_FS_BLKSIZE) ?
IOPOL_VFS_NOCACHE_WRITE_FS_BLKSIZE_ON : IOPOL_VFS_NOCACHE_WRITE_FS_BLKSIZE_DEFAULT;
}
iop_param->iop_policy = policy;
return 0;
}
/* Once set, we don't allow the process or thread to clear it. */
if ((cmd == IOPOL_CMD_SET) && (policy == IOPOL_VFS_NOCACHE_WRITE_FS_BLKSIZE_ON)) {
#if 0
if (thread != THREAD_NULL) {
struct uthread *ut = get_bsdthread_info(thread);
ut->uu_flag |= UT_FS_BLKSIZE_NOCACHE_WRITES;
} else {
os_atomic_or(&p->p_vfs_iopolicy, P_VFS_IOPOLICY_NOCACHE_WRITE_FS_BLKSIZE, relaxed);
}
#endif
return 0;
}
return EINVAL;
}
void
proc_apply_task_networkbg(int pid, thread_t thread)
{
proc_t p = proc_find(pid);
if (p != PROC_NULL) {
do_background_socket(p, thread);
proc_rele(p);
}
}
void
gather_rusage_info(proc_t p, rusage_info_current *ru, int flavor)
{
struct rusage_info_child *ri_child;
assert(p->p_stats != NULL);
memset(ru, 0, sizeof(*ru));
switch (flavor) {
case RUSAGE_INFO_V6:
/* Any P-specific resource counters are captured in fill_task_rusage. */
OS_FALLTHROUGH;
case RUSAGE_INFO_V5:
#if __has_feature(ptrauth_calls)
if (vm_shared_region_is_reslide(proc_task(p))) {
ru->ri_flags |= RU_PROC_RUNS_RESLIDE;
}
#endif /* __has_feature(ptrauth_calls) */
OS_FALLTHROUGH;
case RUSAGE_INFO_V4:
ru->ri_logical_writes = get_task_logical_writes(proc_task(p), false);
ru->ri_lifetime_max_phys_footprint = get_task_phys_footprint_lifetime_max(proc_task(p));
#if CONFIG_LEDGER_INTERVAL_MAX
ru->ri_interval_max_phys_footprint = get_task_phys_footprint_interval_max(proc_task(p), FALSE);
#endif
OS_FALLTHROUGH;
case RUSAGE_INFO_V3:
fill_task_qos_rusage(proc_task(p), ru);
fill_task_billed_usage(proc_task(p), ru);
OS_FALLTHROUGH;
case RUSAGE_INFO_V2:
fill_task_io_rusage(proc_task(p), ru);
OS_FALLTHROUGH;
case RUSAGE_INFO_V1:
/*
* p->p_stats->ri_child statistics are protected under proc lock.
*/
proc_lock(p);
ri_child = &(p->p_stats->ri_child);
ru->ri_child_user_time = ri_child->ri_child_user_time;
ru->ri_child_system_time = ri_child->ri_child_system_time;
ru->ri_child_pkg_idle_wkups = ri_child->ri_child_pkg_idle_wkups;
ru->ri_child_interrupt_wkups = ri_child->ri_child_interrupt_wkups;
ru->ri_child_pageins = ri_child->ri_child_pageins;
ru->ri_child_elapsed_abstime = ri_child->ri_child_elapsed_abstime;
proc_unlock(p);
OS_FALLTHROUGH;
case RUSAGE_INFO_V0:
proc_getexecutableuuid(p, (unsigned char *)&ru->ri_uuid, sizeof(ru->ri_uuid));
fill_task_rusage(proc_task(p), ru);
ru->ri_proc_start_abstime = p->p_stats->ps_start;
}
}
int
proc_get_rusage(proc_t p, int flavor, user_addr_t buffer, __unused int is_zombie)
{
rusage_info_current ri_current = {};
size_t size = 0;
switch (flavor) {
case RUSAGE_INFO_V0:
size = sizeof(struct rusage_info_v0);
break;
case RUSAGE_INFO_V1:
size = sizeof(struct rusage_info_v1);
break;
case RUSAGE_INFO_V2:
size = sizeof(struct rusage_info_v2);
break;
case RUSAGE_INFO_V3:
size = sizeof(struct rusage_info_v3);
break;
case RUSAGE_INFO_V4:
size = sizeof(struct rusage_info_v4);
break;
case RUSAGE_INFO_V5:
size = sizeof(struct rusage_info_v5);
break;
case RUSAGE_INFO_V6:
size = sizeof(struct rusage_info_v6);
break;
default:
return EINVAL;
}
if (size == 0) {
return EINVAL;
}
/*
* If task is still alive, collect info from the live task itself.
* Otherwise, look to the cached info in the zombie proc.
*/
if (p->p_ru) {
return copyout(&p->p_ru->ri, buffer, size);
} else {
gather_rusage_info(p, &ri_current, flavor);
ri_current.ri_proc_exit_abstime = 0;
return copyout(&ri_current, buffer, size);
}
}
static int
mach_to_bsd_rv(int mach_rv)
{
int bsd_rv = 0;
switch (mach_rv) {
case KERN_SUCCESS:
bsd_rv = 0;
break;
case KERN_INVALID_ARGUMENT:
bsd_rv = EINVAL;
break;
default:
panic("unknown error %#x", mach_rv);
}
return bsd_rv;
}
/*
* Resource limit controls
*
* uap->flavor available flavors:
*
* RLIMIT_WAKEUPS_MONITOR
* RLIMIT_CPU_USAGE_MONITOR
* RLIMIT_THREAD_CPULIMITS
* RLIMIT_FOOTPRINT_INTERVAL
*/
int
proc_rlimit_control(__unused struct proc *p, struct proc_rlimit_control_args *uap, __unused int32_t *retval)
{
proc_t targetp;
int error = 0;
struct proc_rlimit_control_wakeupmon wakeupmon_args;
uint32_t cpumon_flags;
uint32_t cpulimits_flags;
kauth_cred_t my_cred, target_cred;
#if CONFIG_LEDGER_INTERVAL_MAX
uint32_t footprint_interval_flags;
uint64_t interval_max_footprint;
#endif /* CONFIG_LEDGER_INTERVAL_MAX */
/* -1 implicitly means our own process (perhaps even the current thread for per-thread attributes) */
if (uap->pid == -1) {
targetp = proc_self();
} else {
targetp = proc_find(uap->pid);
}
/* proc_self() can return NULL for an exiting process */
if (targetp == PROC_NULL) {
return ESRCH;
}
my_cred = kauth_cred_get();
target_cred = kauth_cred_proc_ref(targetp);
if (!kauth_cred_issuser(my_cred) && kauth_cred_getruid(my_cred) &&
kauth_cred_getuid(my_cred) != kauth_cred_getuid(target_cred) &&
kauth_cred_getruid(my_cred) != kauth_cred_getuid(target_cred)) {
proc_rele(targetp);
kauth_cred_unref(&target_cred);
return EACCES;
}
switch (uap->flavor) {
case RLIMIT_WAKEUPS_MONITOR:
if ((error = copyin(uap->arg, &wakeupmon_args, sizeof(wakeupmon_args))) != 0) {
break;
}
if ((error = mach_to_bsd_rv(task_wakeups_monitor_ctl(proc_task(targetp), &wakeupmon_args.wm_flags,
&wakeupmon_args.wm_rate))) != 0) {
break;
}
error = copyout(&wakeupmon_args, uap->arg, sizeof(wakeupmon_args));
break;
case RLIMIT_CPU_USAGE_MONITOR:
cpumon_flags = (uint32_t)uap->arg; // XXX temporarily stashing flags in argp (12592127)
error = mach_to_bsd_rv(task_cpu_usage_monitor_ctl(proc_task(targetp), &cpumon_flags));
break;
case RLIMIT_THREAD_CPULIMITS:
cpulimits_flags = (uint32_t)uap->arg; // only need a limited set of bits, pass in void * argument
if (uap->pid != -1) {
error = EINVAL;
break;
}
uint8_t percent = 0;
uint32_t ms_refill = 0;
uint64_t ns_refill;
percent = (uint8_t)(cpulimits_flags & 0xffU); /* low 8 bits for percent */
ms_refill = (cpulimits_flags >> 8) & 0xffffff; /* next 24 bits represent ms refill value */
if (percent >= 100 || percent == 0) {
error = EINVAL;
break;
}
ns_refill = ((uint64_t)ms_refill) * NSEC_PER_MSEC;
error = mach_to_bsd_rv(thread_set_cpulimit(THREAD_CPULIMIT_BLOCK, percent, ns_refill));
break;
#if CONFIG_LEDGER_INTERVAL_MAX
case RLIMIT_FOOTPRINT_INTERVAL:
footprint_interval_flags = (uint32_t)uap->arg; // XXX temporarily stashing flags in argp (12592127)
/*
* There is currently only one option for this flavor.
*/
if ((footprint_interval_flags & FOOTPRINT_INTERVAL_RESET) == 0) {
error = EINVAL;
break;
}
interval_max_footprint = get_task_phys_footprint_interval_max(proc_task(targetp), TRUE);
break;
#endif /* CONFIG_LEDGER_INTERVAL_MAX */
default:
error = EINVAL;
break;
}
proc_rele(targetp);
kauth_cred_unref(&target_cred);
/*
* Return value from this function becomes errno to userland caller.
*/
return error;
}
/*
* Return the current amount of CPU consumed by this thread (in either user or kernel mode)
*/
int
thread_selfusage(struct proc *p __unused, struct thread_selfusage_args *uap __unused, uint64_t *retval)
{
uint64_t runtime;
runtime = thread_get_runtime_self();
*retval = runtime;
return 0;
}
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