/*
* Copyright (c) 2000-2009 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 NeXT Computer, Inc. All Rights Reserved */
/*
* Copyright (c) 1982, 1986, 1989, 1993
* The Regents of the University of California. All rights reserved.
*
* 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_xxx.c 8.2 (Berkeley) 11/14/93
*/
/*
* 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/kernel.h>
#include <sys/proc_internal.h>
#include <sys/kauth.h>
#include <sys/reboot.h>
#include <sys/vm.h>
#include <sys/sysctl.h>
#include <sys/buf.h>
#include <security/audit/audit.h>
#include <sys/mount_internal.h>
#include <sys/sysproto.h>
#if CONFIG_MACF
#include <security/mac_framework.h>
#endif
#if CONFIG_ATM
#include <atm/atm_internal.h>
#endif
#include <kern/kalloc.h>
#include <kern/ext_paniclog.h>
#include <IOKit/IOBSD.h>
/* Max panic string length */
#define kPanicStringMaxLen 1024
extern int psem_cache_purge_all(void);
extern int pshm_cache_purge_all(void);
extern int pshm_cache_purge_uid(uid_t uid);
extern void reset_osvariant_status(void);
extern void reset_osreleasetype(void);
int
reboot(struct proc *p, struct reboot_args *uap, __unused int32_t *retval)
{
char *message = NULL;
int error = 0;
size_t dummy = 0;
AUDIT_ARG(cmd, uap->opt);
if ((error = suser(kauth_cred_get(), &p->p_acflag))) {
#if (DEVELOPMENT || DEBUG)
if (uap->opt & RB_PANIC) {
/* clear 'error' to allow non-root users to call panic on dev/debug kernels */
error = 0;
} else {
return error;
}
#else
return error;
#endif
}
if (uap->opt & RB_PANIC && uap->msg != USER_ADDR_NULL) {
message = (char *)kalloc_data(kPanicStringMaxLen, Z_WAITOK | Z_ZERO);
if (!message) {
return ENOMEM;
}
int copy_error = copyinstr(uap->msg, (void *)message, kPanicStringMaxLen, (size_t *)&dummy);
if (copy_error != 0 && copy_error != ENAMETOOLONG) {
strncpy(message, "user space RB_PANIC message copyin failed", kPanicStringMaxLen - 1);
} else {
message[kPanicStringMaxLen - 1] = '\0';
}
}
#if CONFIG_MACF
#if (DEVELOPMENT || DEBUG)
if (uap->opt & RB_PANIC) {
/* on dev/debug kernels: allow anyone to call panic */
goto skip_cred_check;
}
#endif
error = mac_system_check_reboot(current_cached_proc_cred(p), uap->opt);
#if (DEVELOPMENT || DEBUG)
skip_cred_check:
#endif
#endif
if (!error) {
OSBitOrAtomic(P_REBOOT, &p->p_flag); /* No more signals for this proc */
error = reboot_kernel(uap->opt, message);
}
kfree_data(message, kPanicStringMaxLen);
return error;
}
int
sys_panic_with_data(struct proc *p,
struct panic_with_data_args *uap,
__unused int32_t *retval)
{
char *message = NULL;
void *data = NULL;
int copy_len = 0;
size_t dummy = 0;
uuid_t uuid = {0};
AUDIT_ARG(addr, uap->addr);
AUDIT_ARG(value32, uap->len);
AUDIT_ARG(addr, uap->uuid);
if (!IOCurrentTaskHasEntitlement(EXTPANICLOG_ENTITLEMENT)) {
return EPERM;
}
const char *proc_name = proc_best_name(p);
if (uap->msg != USER_ADDR_NULL) {
message = (char *)kalloc_data(kPanicStringMaxLen, Z_WAITOK | Z_ZERO);
if (!message) {
goto finish;
}
int copy_error = copyinstr(uap->msg, (void *)message, kPanicStringMaxLen, (size_t *)&dummy);
if (copy_error != 0 && copy_error != ENAMETOOLONG) {
strlcpy(message, "user space panic_with_data message copyin failed", kPanicStringMaxLen - 1);
} else {
message[kPanicStringMaxLen - 1] = '\0';
}
}
if (uap->addr != USER_ADDR_NULL) {
copy_len = MIN(uap->len, PANIC_WITH_DATA_MAX_LEN);
data = kalloc_data(copy_len, Z_WAITOK | Z_ZERO);
if (!data) {
goto finish;
}
int copy_error = copyin(uap->addr, data, copy_len);
if (copy_error != 0) {
kfree_data(data, copy_len);
data = NULL;
}
}
if (uap->uuid != USER_ADDR_NULL) {
int copyerror = copyin(uap->uuid, &uuid[0], sizeof(uuid_t));
if (copyerror != 0) {
goto finish;
}
}
finish:
panic_with_data(uuid, data, copy_len,
"Panic called from Process: %s Message: %s", proc_name, message);
}
extern void OSKextResetAfterUserspaceReboot(void);
extern uint64_t pmap_release_pages_fast(void);
static int
usrctl_full(void)
{
reset_osvariant_status();
reset_osreleasetype();
#if CONFIG_ATM
atm_reset();
#endif
#if CONFIG_EXT_RESOLVER
/*
* We're doing a user space reboot. We are guaranteed that the
* external identity resolver is gone, so ensure that everything
* comes back up as with fresh-boot just in case it didn't go
* down cleanly.
*/
kauth_resolver_identity_reset();
#endif /* CONFIG_EXT_RESOLVER */
OSKextResetAfterUserspaceReboot();
int shm_error = pshm_cache_purge_all();
int sem_error = psem_cache_purge_all();
zone_gc_drain();
pmap_release_pages_fast();
return shm_error != 0 ? shm_error : sem_error;
}
static int
usrctl_logout(uid_t uid)
{
int shm_error = pshm_cache_purge_uid(uid);
/*
* Currently there is a requirement to purge some root-owned semaphores,
* and no use-case for preserving any. Just purge all of them.
*/
int sem_error = psem_cache_purge_all();
/*
* Until rdar://78965143, kern.willuserspacereboot is set when logout begins
* so its effects need to be reset here, when logout completes.
*/
OSKextResetAfterUserspaceReboot();
return shm_error != 0 ? shm_error : sem_error;
}
int
usrctl(struct proc *p, struct usrctl_args *uap, __unused int32_t *retval)
{
if (p != initproc) {
return EPERM;
}
if (uap->flags == 0) {
return usrctl_full();
} else {
return usrctl_logout((uid_t)uap->flags);
}
}