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darling-xnu/bsd/kern/bsd_init.c

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/*
* 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) 1982, 1986, 1989, 1991, 1992, 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.
*
* @(#)init_main.c 8.16 (Berkeley) 5/14/95
*/
/*
*
* 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 McAfee Research in 2004 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/filedesc.h>
#include <sys/kernel.h>
#include <sys/mount_internal.h>
#include <sys/proc_internal.h>
#include <sys/kauth.h>
#include <sys/systm.h>
#include <sys/vnode_internal.h>
#include <sys/conf.h>
#include <sys/buf_internal.h>
#include <sys/user.h>
#include <sys/time.h>
#include <sys/systm.h>
#include <sys/mman.h>
#include <sys/kasl.h>
#include <security/audit/audit.h>
#include <sys/malloc.h>
#include <sys/dkstat.h>
#include <sys/codesign.h>
#include <kern/startup.h>
#include <kern/thread.h>
#include <kern/task.h>
#include <kern/ast.h>
#include <kern/zalloc.h>
#include <kern/ux_handler.h> /* for ux_handler_setup() */
#include <mach/vm_param.h>
#include <vm/vm_map.h>
#include <vm/vm_kern.h>
#include <sys/reboot.h>
#include <dev/busvar.h> /* for pseudo_inits */
#include <sys/kdebug.h>
#include <sys/monotonic.h>
#include <mach/mach_types.h>
#include <mach/vm_prot.h>
#include <mach/semaphore.h>
#include <mach/sync_policy.h>
#include <kern/clock.h>
#include <sys/csr.h>
#include <mach/kern_return.h>
#include <mach/thread_act.h> /* for thread_resume() */
#include <sys/mcache.h> /* for mcache_init() */
#include <sys/mbuf.h> /* for mbinit() */
#include <sys/event.h> /* for knote_init() */
#include <sys/eventhandler.h> /* for eventhandler_init() */
#include <sys/kern_memorystatus.h> /* for memorystatus_init() */
#include <sys/kern_memorystatus_freeze.h> /* for memorystatus_freeze_init() */
#include <sys/aio_kern.h> /* for aio_init() */
#include <sys/semaphore.h> /* for psem_cache_init() */
#include <net/dlil.h> /* for dlil_init() */
#include <net/kpi_protocol.h> /* for proto_kpi_init() */
#include <net/iptap.h> /* for iptap_init() */
#include <sys/socketvar.h> /* for socketinit() */
#include <sys/protosw.h> /* for domaininit() */
#include <kern/sched_prim.h> /* for thread_wakeup() */
#include <net/if_ether.h> /* for ether_family_init() */
#include <net/if_gif.h> /* for gif_init() */
#include <miscfs/devfs/devfsdefs.h> /* for devfs_kernel_mount() */
#include <vm/vm_kern.h> /* for kmem_suballoc() */
#include <sys/msgbuf.h> /* for log_setsize() */
#include <sys/proc_uuid_policy.h> /* proc_uuid_policy_init() */
#include <netinet/flow_divert.h> /* flow_divert_init() */
#include <net/content_filter.h> /* for cfil_init() */
#include <net/necp.h> /* for necp_init() */
#include <net/network_agent.h> /* for netagent_init() */
#include <net/packet_mangler.h> /* for pkt_mnglr_init() */
#include <net/if_utun.h> /* for utun_register_control() */
#include <net/if_ipsec.h> /* for ipsec_register_control() */
#include <net/net_str_id.h> /* for net_str_id_init() */
#include <net/netsrc.h> /* for netsrc_init() */
#include <net/ntstat.h> /* for nstat_init() */
#include <netinet/tcp_cc.h> /* for tcp_cc_init() */
#include <netinet/mptcp_var.h> /* for mptcp_control_register() */
#include <net/nwk_wq.h> /* for nwk_wq_init */
#include <net/restricted_in_port.h> /* for restricted_in_port_init() */
#include <kern/assert.h> /* for assert() */
#include <sys/kern_overrides.h> /* for init_system_override() */
#include <sys/lockf.h> /* for lf_init() */
#include <sys/fsctl.h>
#include <net/init.h>
#if CONFIG_MACF
#include <security/mac_framework.h>
#include <security/mac_internal.h> /* mac_init_bsd() */
#include <security/mac_mach_internal.h> /* mac_update_task_label() */
#endif
#include <machine/exec.h>
#if CONFIG_NETBOOT
#include <sys/netboot.h>
#endif
#if CONFIG_IMAGEBOOT
#include <sys/imageboot.h>
#endif
#if PFLOG
#include <net/if_pflog.h>
#endif
#include <pexpert/pexpert.h>
#include <machine/pal_routines.h>
#include <console/video_console.h>
#if CONFIG_XNUPOST
#include <tests/xnupost.h>
#endif
void * get_user_regs(thread_t); /* XXX kludge for <machine/thread.h> */
void IOKitInitializeTime(void); /* XXX */
void IOSleep(unsigned int); /* XXX */
void loopattach(void); /* XXX */
const char *const copyright =
"Copyright (c) 1982, 1986, 1989, 1991, 1993\n\t"
"The Regents of the University of California. "
"All rights reserved.\n\n";
/* Components of the first process -- never freed. */
struct proc proc0 = { .p_comm = "kernel_task", .p_name = "kernel_task" };
struct session session0;
struct pgrp pgrp0;
struct filedesc filedesc0;
struct plimit limit0;
struct pstats pstats0;
struct sigacts sigacts0;
SECURITY_READ_ONLY_LATE(proc_t) kernproc = &proc0;
proc_t XNU_PTRAUTH_SIGNED_PTR("initproc") initproc;
long tk_cancc;
long tk_nin;
long tk_nout;
long tk_rawcc;
int lock_trace = 0;
/* Global variables to make pstat happy. We do swapping differently */
int nswdev, nswap;
int nswapmap;
void *swapmap;
struct swdevt swdevt[1];
static LCK_GRP_DECLARE(hostname_lck_grp, "hostname");
LCK_MTX_DECLARE(hostname_lock, &hostname_lck_grp);
LCK_MTX_DECLARE(domainname_lock, &hostname_lck_grp);
dev_t rootdev; /* device of the root */
dev_t dumpdev; /* device to take dumps on */
long dumplo; /* offset into dumpdev */
long hostid;
char hostname[MAXHOSTNAMELEN];
char domainname[MAXDOMNAMELEN];
char rootdevice[DEVMAXNAMESIZE];
struct vnode *rootvp;
bool rootvp_is_ssd = false;
int boothowto;
int minimalboot = 0;
#if CONFIG_DARKBOOT
int darkboot = 0;
#endif
#if __arm64__
int legacy_footprint_entitlement_mode = LEGACY_FOOTPRINT_ENTITLEMENT_IGNORE;
#endif /* __arm64__ */
#if PROC_REF_DEBUG
__private_extern__ int proc_ref_tracking_disabled = 0; /* disable panics on leaked proc refs across syscall boundary */
#endif
extern kern_return_t IOFindBSDRoot(char *, unsigned int, dev_t *, u_int32_t *);
extern void IOSecureBSDRoot(const char * rootName);
extern kern_return_t IOKitBSDInit(void );
extern boolean_t IOSetRecoveryBoot(bsd_bootfail_mode_t, uuid_t, boolean_t);
extern void kminit(void);
extern void bsd_bufferinit(void);
extern void oslog_setsize(int size);
extern void throttle_init(void);
#if CONFIG_LOCKERBOOT
#define LOCKER_PROTOBOOT_MOUNT "/protoboot"
const char kernel_protoboot_mount[] = LOCKER_PROTOBOOT_MOUNT;
extern int mount_locker_protoboot(const char *fsname, const char *mntpoint,
const char *pbdevpath);
#endif
extern int ncl;
#if DEVELOPMENT || DEBUG
extern int syscallfilter_disable;
#endif // DEVELOPMENT || DEBUG
vm_map_t bsd_pageable_map;
vm_map_t mb_map;
static int bsd_simul_execs;
static int bsd_pageable_map_size;
__private_extern__ int execargs_cache_size = 0;
__private_extern__ int execargs_free_count = 0;
__private_extern__ vm_offset_t * execargs_cache = NULL;
void bsd_exec_setup(int);
__private_extern__ int bootarg_execfailurereports = 0;
#if __x86_64__
__private_extern__ int bootarg_no32exec = 1;
#endif
__private_extern__ int bootarg_vnode_cache_defeat = 0;
#if CONFIG_JETSAM && (DEVELOPMENT || DEBUG)
__private_extern__ int bootarg_no_vnode_jetsam = 0;
#endif /* CONFIG_JETSAM && (DEVELOPMENT || DEBUG) */
__private_extern__ int bootarg_no_vnode_drain = 0;
/*
* Prevent kernel-based ASLR from being used, for testing.
*/
#if DEVELOPMENT || DEBUG
__private_extern__ int bootarg_disable_aslr = 0;
#endif
/*
* Allow an alternate dyld to be used for testing.
*/
#if DEVELOPMENT || DEBUG
char dyld_alt_path[MAXPATHLEN];
int use_alt_dyld = 0;
extern uint64_t dyld_flags;
#endif
int cmask = CMASK;
extern int customnbuf;
kern_return_t bsd_autoconf(void);
void bsd_utaskbootstrap(void);
static void parse_bsd_args(void);
#if CONFIG_DEV_KMEM
extern void dev_kmem_init(void);
#endif
extern void select_waitq_init(void);
static void process_name(const char *, proc_t);
static void setconf(void);
#if CONFIG_BASESYSTEMROOT
static int bsd_find_basesystem_dmg(char *bsdmgpath_out, bool *rooted_dmg, bool *skip_signature_check);
static boolean_t bsdmgroot_bootable(void);
#endif // CONFIG_BASESYSTEMROOT
static bool bsd_rooted_ramdisk(void);
#if SYSV_SHM
extern void sysv_shm_lock_init(void);
#endif
#if SYSV_SEM
extern void sysv_sem_lock_init(void);
#endif
#if SYSV_MSG
extern void sysv_msg_lock_init(void);
#endif
extern void ulock_initialize(void);
#if CONFIG_MACF
#if defined (__i386__) || defined (__x86_64__)
/* MACF policy_check configuration flags; see policy_check.c for details */
int policy_check_flags = 0;
extern int check_policy_init(int);
#endif
#endif /* CONFIG_MACF */
/* If we are using CONFIG_DTRACE */
#if CONFIG_DTRACE
extern void dtrace_postinit(void);
#endif
/*
* Initialization code.
* Called from cold start routine as
* soon as a stack and segmentation
* have been established.
* Functions:
* turn on clock
* hand craft 0th process
* call all initialization routines
* hand craft 1st user process
*/
/*
* Sets the name for the given task.
*/
static void
process_name(const char *s, proc_t p)
{
strlcpy(p->p_comm, s, sizeof(p->p_comm));
strlcpy(p->p_name, s, sizeof(p->p_name));
}
/* To allow these values to be patched, they're globals here */
#include <machine/vmparam.h>
struct rlimit vm_initial_limit_stack = { .rlim_cur = DFLSSIZ, .rlim_max = MAXSSIZ - PAGE_MAX_SIZE };
struct rlimit vm_initial_limit_data = { .rlim_cur = DFLDSIZ, .rlim_max = MAXDSIZ };
struct rlimit vm_initial_limit_core = { .rlim_cur = DFLCSIZ, .rlim_max = MAXCSIZ };
extern struct os_refgrp rlimit_refgrp;
extern thread_t cloneproc(task_t, coalition_t, proc_t, int, int);
extern int (*mountroot)(void);
LCK_ATTR_DECLARE(proc_lck_attr, 0, 0);
LCK_GRP_DECLARE(proc_lck_grp, "proc");
LCK_GRP_DECLARE(proc_slock_grp, "proc-slock");
LCK_GRP_DECLARE(proc_fdmlock_grp, "proc-fdmlock");
LCK_GRP_DECLARE(proc_mlock_grp, "proc-mlock");
LCK_GRP_DECLARE(proc_ucred_mlock_grp, "proc-ucred-mlock");
LCK_GRP_DECLARE(proc_dirslock_grp, "proc-dirslock");
LCK_GRP_DECLARE(proc_kqhashlock_grp, "proc-kqhashlock");
LCK_GRP_DECLARE(proc_knhashlock_grp, "proc-knhashlock");
LCK_MTX_DECLARE_ATTR(proc_list_mlock, &proc_mlock_grp, &proc_lck_attr);
#if XNU_TARGET_OS_OSX
/* hook called after root is mounted XXX temporary hack */
void (*mountroot_post_hook)(void);
void (*unmountroot_pre_hook)(void);
#endif
void set_rootvnode(vnode_t);
extern lck_rw_t rootvnode_rw_lock;
/* called with an iocount and usecount on new_rootvnode */
void
set_rootvnode(vnode_t new_rootvnode)
{
mount_t new_mount = (new_rootvnode != NULL) ? new_rootvnode->v_mount : NULL;
vnode_t new_devvp = (new_mount != NULL) ? new_mount->mnt_devvp : NULL;
vnode_t old_rootvnode = rootvnode;
new_rootvnode->v_flag |= VROOT;
rootvp = new_devvp;
rootvnode = new_rootvnode;
filedesc0.fd_cdir = new_rootvnode;
if (new_devvp != NULL) {
rootdev = vnode_specrdev(new_devvp);
} else if (new_mount != NULL) {
rootdev = vfs_statfs(new_mount)->f_fsid.val[0]; /* like ATTR_CMN_DEVID */
} else {
rootdev = NODEV;
}
if (old_rootvnode) {
vnode_rele(old_rootvnode);
}
}
#define RAMDEV "md0"
bool
bsd_rooted_ramdisk(void)
{
bool is_ramdisk = false;
char *dev_path = zalloc(ZV_NAMEI);
if (dev_path == NULL) {
panic("failed to allocate devpath string! \n");
}
if (PE_parse_boot_argn("rd", dev_path, MAXPATHLEN)) {
if (strncmp(dev_path, RAMDEV, strlen(RAMDEV)) == 0) {
is_ramdisk = true;
}
}
zfree(ZV_NAMEI, dev_path);
return is_ramdisk;
}
/*
* This function is called very early on in the Mach startup, from the
* function start_kernel_threads() in osfmk/kern/startup.c. It's called
* in the context of the current (startup) task using a call to the
* function kernel_thread_create() to jump into start_kernel_threads().
* Internally, kernel_thread_create() calls thread_create_internal(),
* which calls uthread_alloc(). The function of uthread_alloc() is
* normally to allocate a uthread structure, and fill out the uu_sigmask,
* uu_context fields. It skips filling these out in the case of the "task"
* being "kernel_task", because the order of operation is inverted. To
* account for that, we need to manually fill in at least the contents
* of the uu_context.vc_ucred field so that the uthread structure can be
* used like any other.
*/
void
bsd_init(void)
{
struct uthread *ut;
unsigned int i;
struct vfs_context context;
kern_return_t ret;
struct ucred temp_cred;
struct posix_cred temp_pcred;
vnode_t init_rootvnode = NULLVP;
#if CONFIG_NETBOOT || CONFIG_IMAGEBOOT
boolean_t netboot = FALSE;
#endif
#if CONFIG_LOCKERBOOT
vnode_t pbvn = NULLVP;
mount_t pbmnt = NULL;
char *pbdevp = NULL;
char pbdevpath[64];
char pbfsname[MFSNAMELEN];
const char *slash_dev = NULL;
#endif
#define DEBUG_BSDINIT 0
#if DEBUG_BSDINIT
#define bsd_init_kprintf(x, ...) kprintf("bsd_init: " x, ## __VA_ARGS__)
#else
#define bsd_init_kprintf(x, ...)
#endif
throttle_init();
printf(copyright);
bsd_init_kprintf("calling parse_bsd_args\n");
parse_bsd_args();
#if CONFIG_DEV_KMEM
bsd_init_kprintf("calling dev_kmem_init\n");
dev_kmem_init();
#endif
/* Initialize kauth subsystem before instancing the first credential */
bsd_init_kprintf("calling kauth_init\n");
kauth_init();
/* Initialize process and pgrp structures. */
bsd_init_kprintf("calling procinit\n");
procinit();
/* kernel_task->proc = kernproc; */
set_bsdtask_info(kernel_task, (void *)kernproc);
/* give kernproc a name */
bsd_init_kprintf("calling process_name\n");
process_name("kernel_task", kernproc);
/* Allocate proc lock attribute */
lck_mtx_init(&kernproc->p_mlock, &proc_mlock_grp, &proc_lck_attr);
lck_mtx_init(&kernproc->p_fdmlock, &proc_fdmlock_grp, &proc_lck_attr);
lck_mtx_init(&kernproc->p_ucred_mlock, &proc_ucred_mlock_grp, &proc_lck_attr);
lck_spin_init(&kernproc->p_slock, &proc_slock_grp, &proc_lck_attr);
lck_rw_init(&kernproc->p_dirs_lock, &proc_dirslock_grp, &proc_lck_attr);
assert(bsd_simul_execs != 0);
execargs_cache_size = bsd_simul_execs;
execargs_free_count = bsd_simul_execs;
execargs_cache = zalloc_permanent(bsd_simul_execs * sizeof(vm_offset_t),
ZALIGN(vm_offset_t));
if (current_task() != kernel_task) {
printf("bsd_init: We have a problem, "
"current task is not kernel task\n");
}
bsd_init_kprintf("calling get_bsdthread_info\n");
ut = (uthread_t)get_bsdthread_info(current_thread());
#if CONFIG_MACF
/*
* Initialize the MAC Framework
*/
mac_policy_initbsd();
#if defined (__i386__) || defined (__x86_64__)
/*
* We currently only support this on i386/x86_64, as that is the
* only lock code we have instrumented so far.
*/
check_policy_init(policy_check_flags);
#endif
#endif /* MAC */
ulock_initialize();
/*
* Create process 0.
*/
proc_list_lock();
LIST_INSERT_HEAD(&allproc, kernproc, p_list);
kernproc->p_pgrp = &pgrp0;
LIST_INSERT_HEAD(PGRPHASH(0), &pgrp0, pg_hash);
LIST_INIT(&pgrp0.pg_members);
lck_mtx_init(&pgrp0.pg_mlock, &proc_mlock_grp, &proc_lck_attr);
/* There is no other bsd thread this point and is safe without pgrp lock */
LIST_INSERT_HEAD(&pgrp0.pg_members, kernproc, p_pglist);
kernproc->p_listflag |= P_LIST_INPGRP;
kernproc->p_pgrpid = 0;
kernproc->p_uniqueid = 0;
pgrp0.pg_session = &session0;
pgrp0.pg_membercnt = 1;
session0.s_count = 1;
session0.s_leader = kernproc;
session0.s_listflags = 0;
lck_mtx_init(&session0.s_mlock, &proc_mlock_grp, &proc_lck_attr);
LIST_INSERT_HEAD(SESSHASH(0), &session0, s_hash);
proc_list_unlock();
#if CONFIG_PERSONAS
kernproc->p_persona = NULL;
#endif
kernproc->task = kernel_task;
kernproc->p_stat = SRUN;
kernproc->p_flag = P_SYSTEM;
kernproc->p_lflag = 0;
kernproc->p_ladvflag = 0;
#if defined(__LP64__)
kernproc->p_flag |= P_LP64;
#endif
#if DEVELOPMENT || DEBUG
if (bootarg_disable_aslr) {
kernproc->p_flag |= P_DISABLE_ASLR;
}
#endif
kernproc->p_nice = NZERO;
kernproc->p_pptr = kernproc;
TAILQ_INIT(&kernproc->p_uthlist);
TAILQ_INSERT_TAIL(&kernproc->p_uthlist, ut, uu_list);
kernproc->sigwait = FALSE;
kernproc->sigwait_thread = THREAD_NULL;
kernproc->exit_thread = THREAD_NULL;
kernproc->p_csflags = CS_VALID;
/*
* Create credential. This also Initializes the audit information.
*/
bsd_init_kprintf("calling bzero\n");
bzero(&temp_cred, sizeof(temp_cred));
bzero(&temp_pcred, sizeof(temp_pcred));
temp_pcred.cr_ngroups = 1;
/* kern_proc, shouldn't call up to DS for group membership */
temp_pcred.cr_flags = CRF_NOMEMBERD;
temp_cred.cr_audit.as_aia_p = audit_default_aia_p;
bsd_init_kprintf("calling kauth_cred_create\n");
/*
* We have to label the temp cred before we create from it to
* properly set cr_ngroups, or the create will fail.
*/
posix_cred_label(&temp_cred, &temp_pcred);
kernproc->p_ucred = kauth_cred_create(&temp_cred);
/* update cred on proc */
PROC_UPDATE_CREDS_ONPROC(kernproc);
/* give the (already exisiting) initial thread a reference on it */
bsd_init_kprintf("calling kauth_cred_ref\n");
kauth_cred_ref(kernproc->p_ucred);
ut->uu_context.vc_ucred = kernproc->p_ucred;
ut->uu_context.vc_thread = current_thread();
vfs_set_context_kernel(&ut->uu_context);
TAILQ_INIT(&kernproc->p_aio_activeq);
TAILQ_INIT(&kernproc->p_aio_doneq);
kernproc->p_aio_total_count = 0;
#if CONFIG_MACF
mac_cred_label_associate_kernel(kernproc->p_ucred);
#endif
/* Create the file descriptor table. */
kernproc->p_fd = &filedesc0;
filedesc0.fd_cmask = (mode_t)cmask;
filedesc0.fd_knlistsize = 0;
filedesc0.fd_knlist = NULL;
filedesc0.fd_knhash = NULL;
filedesc0.fd_knhashmask = 0;
lck_mtx_init(&filedesc0.fd_kqhashlock, &proc_kqhashlock_grp, &proc_lck_attr);
lck_mtx_init(&filedesc0.fd_knhashlock, &proc_knhashlock_grp, &proc_lck_attr);
/* Create the limits structures. */
kernproc->p_limit = &limit0;
for (i = 0; i < sizeof(kernproc->p_limit->pl_rlimit) / sizeof(kernproc->p_limit->pl_rlimit[0]); i++) {
limit0.pl_rlimit[i].rlim_cur =
limit0.pl_rlimit[i].rlim_max = RLIM_INFINITY;
}
limit0.pl_rlimit[RLIMIT_NOFILE].rlim_cur = NOFILE;
limit0.pl_rlimit[RLIMIT_NPROC].rlim_cur = maxprocperuid;
limit0.pl_rlimit[RLIMIT_NPROC].rlim_max = maxproc;
limit0.pl_rlimit[RLIMIT_STACK] = vm_initial_limit_stack;
limit0.pl_rlimit[RLIMIT_DATA] = vm_initial_limit_data;
limit0.pl_rlimit[RLIMIT_CORE] = vm_initial_limit_core;
os_ref_init_count(&limit0.pl_refcnt, &rlimit_refgrp, 1);
kernproc->p_stats = &pstats0;
kernproc->p_sigacts = &sigacts0;
kernproc->p_subsystem_root_path = NULL;
/*
* Charge root for one process: launchd.
*/
bsd_init_kprintf("calling chgproccnt\n");
(void)chgproccnt(0, 1);
/*
* Allocate a kernel submap for pageable memory
* for temporary copying (execve()).
*/
{
vm_offset_t minimum;
bsd_init_kprintf("calling kmem_suballoc\n");
assert(bsd_pageable_map_size != 0);
ret = kmem_suballoc(kernel_map,
&minimum,
(vm_size_t)bsd_pageable_map_size,
TRUE,
VM_FLAGS_ANYWHERE,
VM_MAP_KERNEL_FLAGS_NONE,
VM_KERN_MEMORY_BSD,
&bsd_pageable_map);
if (ret != KERN_SUCCESS) {
panic("bsd_init: Failed to allocate bsd pageable map");
}
}
/*
* Initialize buffers and hash links for buffers
*
* SIDE EFFECT: Starts a thread for bcleanbuf_thread(), so must
* happen after a credential has been associated with
* the kernel task.
*/
bsd_init_kprintf("calling bsd_bufferinit\n");
bsd_bufferinit();
/*
* Initialize the calendar.
*/
bsd_init_kprintf("calling IOKitInitializeTime\n");
IOKitInitializeTime();
/* Initialize the file systems. */
bsd_init_kprintf("calling vfsinit\n");
vfsinit();
#if CONFIG_PROC_UUID_POLICY
/* Initial proc_uuid_policy subsystem */
bsd_init_kprintf("calling proc_uuid_policy_init()\n");
proc_uuid_policy_init();
#endif
#if SOCKETS
/* Initialize per-CPU cache allocator */
mcache_init();
/* Initialize mbuf's. */
bsd_init_kprintf("calling mbinit\n");
mbinit();
net_str_id_init(); /* for mbuf tags */
restricted_in_port_init();
#endif /* SOCKETS */
/*
* Initializes security event auditing.
* XXX: Should/could this occur later?
*/
#if CONFIG_AUDIT
bsd_init_kprintf("calling audit_init\n");
audit_init();
#endif
/* Initialize kqueues */
bsd_init_kprintf("calling knote_init\n");
knote_init();
/* Initialize event handler */
bsd_init_kprintf("calling eventhandler_init\n");
eventhandler_init();
/* Initialize for async IO */
bsd_init_kprintf("calling aio_init\n");
aio_init();
pthread_init();
/* POSIX Shm and Sem */
bsd_init_kprintf("calling pshm_cache_init\n");
pshm_cache_init();
bsd_init_kprintf("calling psem_cache_init\n");
psem_cache_init();
bsd_init_kprintf("calling select_waitq_init\n");
select_waitq_init();
/*
* Initialize protocols. Block reception of incoming packets
* until everything is ready.
*/
#if NETWORKING
bsd_init_kprintf("calling nwk_wq_init\n");
nwk_wq_init();
bsd_init_kprintf("calling dlil_init\n");
dlil_init();
bsd_init_kprintf("calling proto_kpi_init\n");
proto_kpi_init();
#endif /* NETWORKING */
#if SOCKETS
bsd_init_kprintf("calling socketinit\n");
socketinit();
bsd_init_kprintf("calling domaininit\n");
domaininit();
iptap_init();
#if FLOW_DIVERT
flow_divert_init();
#endif /* FLOW_DIVERT */
#endif /* SOCKETS */
#if NETWORKING
#if NECP
/* Initialize Network Extension Control Policies */
necp_init();
#endif
netagent_init();
#endif /* NETWORKING */
kernproc->p_fd->fd_cdir = NULL;
kernproc->p_fd->fd_rdir = NULL;
#if defined (__x86_64__) && (DEBUG || DEVELOPMENT)
hvg_bsd_init();
#endif /* DEBUG || DEVELOPMENT */
#if CONFIG_FREEZE
#ifndef CONFIG_MEMORYSTATUS
#error "CONFIG_FREEZE defined without matching CONFIG_MEMORYSTATUS"
#endif
/* Initialise background freezing */
bsd_init_kprintf("calling memorystatus_freeze_init\n");
memorystatus_freeze_init();
#endif
#if CONFIG_MEMORYSTATUS
/* Initialize kernel memory status notifications */
bsd_init_kprintf("calling memorystatus_init\n");
memorystatus_init();
#endif /* CONFIG_MEMORYSTATUS */
bsd_init_kprintf("calling sysctl_mib_init\n");
sysctl_mib_init();
bsd_init_kprintf("calling bsd_autoconf\n");
bsd_autoconf();
#if CONFIG_DTRACE
dtrace_postinit();
#endif
/*
* We attach the loopback interface *way* down here to ensure
* it happens after autoconf(), otherwise it becomes the
* "primary" interface.
*/
#include <loop.h>
#if NLOOP > 0
bsd_init_kprintf("calling loopattach\n");
loopattach(); /* XXX */
#endif
#if NGIF
/* Initialize gif interface (after lo0) */
gif_init();
#endif
#if PFLOG
/* Initialize packet filter log interface */
pfloginit();
#endif /* PFLOG */
#if NETHER > 0
/* Register the built-in dlil ethernet interface family */
bsd_init_kprintf("calling ether_family_init\n");
ether_family_init();
#endif /* ETHER */
#if NETWORKING
#if CONTENT_FILTER
cfil_init();
#endif
#if PACKET_MANGLER
pkt_mnglr_init();
#endif
/*
* Register subsystems with kernel control handlers
*/
utun_register_control();
#if IPSEC
ipsec_register_control();
#endif /* IPSEC */
netsrc_init();
nstat_init();
tcp_cc_init();
#if MPTCP
mptcp_control_register();
#endif /* MPTCP */
/*
* The the networking stack is now initialized so it is a good time to call
* the clients that are waiting for the networking stack to be usable.
*/
bsd_init_kprintf("calling net_init_run\n");
net_init_run();
#endif /* NETWORKING */
bsd_init_kprintf("calling inittodr\n");
inittodr(0);
/* Mount the root file system. */
while (TRUE) {
int err;
bsd_init_kprintf("calling setconf\n");
setconf();
#if CONFIG_NETBOOT
netboot = (mountroot == netboot_mountroot);
#endif
bsd_init_kprintf("vfs_mountroot\n");
if (0 == (err = vfs_mountroot())) {
break;
}
rootdevice[0] = '\0';
#if CONFIG_NETBOOT
if (netboot) {
PE_display_icon( 0, "noroot"); /* XXX a netboot-specific icon would be nicer */
vc_progress_set(FALSE, 0);
for (i = 1; 1; i *= 2) {
printf("bsd_init: failed to mount network root, error %d, %s\n",
err, PE_boot_args());
printf("We are hanging here...\n");
IOSleep(i * 60 * 1000);
}
/*NOTREACHED*/
}
#endif
printf("cannot mount root, errno = %d\n", err);
boothowto |= RB_ASKNAME;
}
IOSecureBSDRoot(rootdevice);
context.vc_thread = current_thread();
context.vc_ucred = kernproc->p_ucred;
mountlist.tqh_first->mnt_flag |= MNT_ROOTFS;
bsd_init_kprintf("calling VFS_ROOT\n");
/* Get the vnode for '/'. Set fdp->fd_fd.fd_cdir to reference it. */
if (VFS_ROOT(mountlist.tqh_first, &init_rootvnode, &context)) {
panic("bsd_init: cannot find root vnode: %s", PE_boot_args());
}
(void)vnode_ref(init_rootvnode);
(void)vnode_put(init_rootvnode);
lck_rw_lock_exclusive(&rootvnode_rw_lock);
set_rootvnode(init_rootvnode);
lck_rw_unlock_exclusive(&rootvnode_rw_lock);
init_rootvnode = NULLVP; /* use rootvnode after this point */
if (!bsd_rooted_ramdisk()) {
#if CONFIG_IMAGEBOOT
#if XNU_TARGET_OS_OSX && defined(__arm64__)
/* Apple Silicon MacOS */
if (!imageboot_desired()) {
/* enforce sealedness */
int autherr = VNOP_IOCTL(rootvnode, FSIOC_KERNEL_ROOTAUTH, NULL, 0, vfs_context_kernel());
if (autherr) {
panic("rootvp not authenticated after mounting \n");
}
}
#endif // TARGET_OS_OSX && arm64
#endif // config_imageboot
/* Otherwise, noop */
}
#if CONFIG_NETBOOT
if (netboot) {
int err;
netboot = TRUE;
/* post mount setup */
if ((err = netboot_setup()) != 0) {
PE_display_icon( 0, "noroot"); /* XXX a netboot-specific icon would be nicer */
vc_progress_set(FALSE, 0);
for (i = 1; 1; i *= 2) {
printf("bsd_init: NetBoot could not find root, error %d: %s\n",
err, PE_boot_args());
printf("We are hanging here...\n");
IOSleep(i * 60 * 1000);
}
/*NOTREACHED*/
}
}
#endif
#if CONFIG_IMAGEBOOT
#if CONFIG_LOCKERBOOT
/*
* Stash the protoboot vnode, mount, filesystem name, and device name for
* later use. Note that the mount-from name may not have the "/dev/"
* component, so we must sniff out this condition and add it as needed.
*/
pbvn = rootvnode;
pbmnt = pbvn->v_mount;
pbdevp = vfs_statfs(pbmnt)->f_mntfromname;
slash_dev = strnstr(pbdevp, "/dev/", strlen(pbdevp));
if (slash_dev) {
/*
* If the old root is a snapshot mount, it will have the form:
*
* com.apple.os.update-<boot manifest hash>@<dev node path>
*
* So we just search the mntfromname for any occurrence of "/dev/" and
* grab that as the device path. The image boot code needs a dev node to
* do the re-mount, so we cannot directly mount the snapshot as the
* protoboot volume currently.
*/
strlcpy(pbdevpath, slash_dev, sizeof(pbdevpath));
} else {
snprintf(pbdevpath, sizeof(pbdevpath), "/dev/%s", pbdevp);
}
bsd_init_kprintf("protoboot mount-from: %s\n", pbdevp);
bsd_init_kprintf("protoboot dev path: %s\n", pbdevpath);
strlcpy(pbfsname, pbmnt->mnt_vtable->vfc_name, sizeof(pbfsname));
#endif
/*
* See if a system disk image is present. If so, mount it and
* switch the root vnode to point to it
*/
imageboot_type_t imageboot_type = imageboot_needed();
if (netboot == FALSE && imageboot_type) {
/*
* An image was found. No turning back: we're booted
* with a kernel from the disk image.
*/
bsd_init_kprintf("doing image boot: type = %d\n", imageboot_type);
imageboot_setup(imageboot_type);
}
#if CONFIG_LOCKERBOOT
if (imageboot_type == IMAGEBOOT_LOCKER) {
bsd_init_kprintf("booting from locker\n");
if (vnode_tag(rootvnode) != VT_LOCKERFS) {
panic("root filesystem not a locker: fsname = %s",
rootvnode->v_mount->mnt_vtable->vfc_name);
}
}
#endif /* CONFIG_LOCKERBOOT */
#endif /* CONFIG_IMAGEBOOT */
/* set initial time; all other resource data is already zero'ed */
microtime_with_abstime(&kernproc->p_start, &kernproc->p_stats->ps_start);
#if DEVFS
{
char mounthere[] = "/dev"; /* !const because of internal casting */
bsd_init_kprintf("calling devfs_kernel_mount\n");
devfs_kernel_mount(mounthere);
}
#endif /* DEVFS */
#if CONFIG_BASESYSTEMROOT
#if CONFIG_IMAGEBOOT
if (bsdmgroot_bootable()) {
int error;
bool rooted_dmg = false;
bool skip_signature_check = false;
printf("trying to find and mount BaseSystem dmg as root volume\n");
#if DEVELOPMENT || DEBUG
printf("(set boot-arg -nobsdmgroot to avoid this)\n");
#endif // DEVELOPMENT || DEBUG
char *dmgpath = NULL;
dmgpath = zalloc_flags(ZV_NAMEI, Z_ZERO | Z_WAITOK);
if (dmgpath == NULL) {
panic("%s: M_NAMEI zone exhausted", __FUNCTION__);
}
error = bsd_find_basesystem_dmg(dmgpath, &rooted_dmg, &skip_signature_check);
if (error) {
bsd_init_kprintf("failed to to find BaseSystem dmg: error = %d\n", error);
} else {
PE_parse_boot_argn("bsdmgpath", dmgpath, sizeof(dmgpath));
bsd_init_kprintf("found BaseSystem dmg at: %s\n", dmgpath);
error = imageboot_pivot_image(dmgpath, IMAGEBOOT_DMG, "/System/Volumes/BaseSystem", "System/Volumes/macOS", rooted_dmg, skip_signature_check);
if (error) {
bsd_init_kprintf("couldn't mount BaseSystem dmg: error = %d", error);
}
}
zfree(ZV_NAMEI, dmgpath);
}
#else /* CONFIG_IMAGEBOOT */
#error CONFIG_BASESYSTEMROOT requires CONFIG_IMAGEBOOT
#endif /* CONFIG_IMAGEBOOT */
#endif /* CONFIG_BASESYSTEMROOT */
#if CONFIG_LOCKERBOOT
/*
* We need to wait until devfs is up before remounting the protoboot volume
* within the locker so that it can have a real devfs vnode backing it.
*/
if (imageboot_type == IMAGEBOOT_LOCKER) {
bsd_init_kprintf("re-mounting protoboot volume\n");
int error = mount_locker_protoboot(pbfsname, LOCKER_PROTOBOOT_MOUNT,
pbdevpath);
if (error) {
panic("failed to mount protoboot volume: dev path = %s, error = %d",
pbdevpath, error);
}
}
#endif /* CONFIG_LOCKERBOOT */
/* Initialize signal state for process 0. */
bsd_init_kprintf("calling siginit\n");
siginit(kernproc);
bsd_init_kprintf("calling bsd_utaskbootstrap\n");
bsd_utaskbootstrap();
pal_kernel_announce();
bsd_init_kprintf("calling mountroot_post_hook\n");
#if XNU_TARGET_OS_OSX
/* invoke post-root-mount hook */
if (mountroot_post_hook != NULL) {
mountroot_post_hook();
}
#endif
#if 0 /* not yet */
consider_zone_gc(FALSE);
#endif
bsd_init_kprintf("done\n");
}
void
bsdinit_task(void)
{
proc_t p = current_proc();
process_name("init", p);
/* Set up exception-to-signal reflection */
ux_handler_setup();
#if CONFIG_MACF
mac_cred_label_associate_user(p->p_ucred);
#endif
vm_init_before_launchd();
#if CONFIG_XNUPOST
int result = bsd_list_tests();
result = bsd_do_post();
if (result != 0) {
panic("bsd_do_post: Tests failed with result = 0x%08x\n", result);
}
#endif
bsd_init_kprintf("bsd_do_post - done");
load_init_program(p);
lock_trace = 1;
}
kern_return_t
bsd_autoconf(void)
{
kprintf("bsd_autoconf: calling kminit\n");
kminit();
/*
* Early startup for bsd pseudodevices.
*/
{
struct pseudo_init *pi;
for (pi = pseudo_inits; pi->ps_func; pi++) {
(*pi->ps_func)(pi->ps_count);
}
}
return IOKitBSDInit();
}
#include <sys/disklabel.h> /* for MAXPARTITIONS */
static void
setconf(void)
{
u_int32_t flags;
kern_return_t err;
err = IOFindBSDRoot(rootdevice, sizeof(rootdevice), &rootdev, &flags);
if (err) {
printf("setconf: IOFindBSDRoot returned an error (%d);"
"setting rootdevice to 'sd0a'.\n", err); /* XXX DEBUG TEMP */
rootdev = makedev( 6, 0 );
strlcpy(rootdevice, "sd0a", sizeof(rootdevice));
flags = 0;
}
#if CONFIG_NETBOOT
if (flags & 1) {
/* network device */
mountroot = netboot_mountroot;
} else {
#endif
/* otherwise have vfs determine root filesystem */
mountroot = NULL;
#if CONFIG_NETBOOT
}
#endif
}
/*
* Boot into the flavor of Recovery dictated by `mode`.
*/
boolean_t
bsd_boot_to_recovery(bsd_bootfail_mode_t mode, uuid_t volume_uuid, boolean_t reboot)
{
return IOSetRecoveryBoot(mode, volume_uuid, reboot);
}
void
bsd_utaskbootstrap(void)
{
thread_t thread;
struct uthread *ut;
/*
* Clone the bootstrap process from the kernel process, without
* inheriting either task characteristics or memory from the kernel;
*/
thread = cloneproc(TASK_NULL, COALITION_NULL, kernproc, FALSE, TRUE);
/* Hold the reference as it will be dropped during shutdown */
initproc = proc_find(1);
#if __PROC_INTERNAL_DEBUG
if (initproc == PROC_NULL) {
panic("bsd_utaskbootstrap: initproc not set\n");
}
#endif
zalloc_first_proc_made();
/*
* Since we aren't going back out the normal way to our parent,
* we have to drop the transition locks explicitly.
*/
proc_signalend(initproc, 0);
proc_transend(initproc, 0);
ut = (struct uthread *)get_bsdthread_info(thread);
ut->uu_sigmask = 0;
act_set_astbsd(thread);
task_clear_return_wait(get_threadtask(thread), TCRW_CLEAR_ALL_WAIT);
}
static void
parse_bsd_args(void)
{
char namep[48];
int msgbuf;
if (PE_parse_boot_argn("-s", namep, sizeof(namep))) {
boothowto |= RB_SINGLE;
}
if (PE_parse_boot_argn("-x", namep, sizeof(namep))) { /* safe boot */
boothowto |= RB_SAFEBOOT;
}
if (PE_parse_boot_argn("-minimalboot", namep, sizeof(namep))) {
/*
* -minimalboot indicates that we want userspace to be bootstrapped to a
* minimal environment. What constitutes minimal is up to the bootstrap
* process.
*/
minimalboot = 1;
}
#if __x86_64__
int no32exec;
/* disable 32 bit grading */
if (PE_parse_boot_argn("no32exec", &no32exec, sizeof(no32exec))) {
bootarg_no32exec = !!no32exec;
}
#endif
int execfailure_crashreports;
/* enable crash reports on various exec failures */
if (PE_parse_boot_argn("execfailurecrashes", &execfailure_crashreports, sizeof(execfailure_crashreports))) {
bootarg_execfailurereports = !!execfailure_crashreports;
}
/* disable vnode_cache_is_authorized() by setting vnode_cache_defeat */
if (PE_parse_boot_argn("-vnode_cache_defeat", namep, sizeof(namep))) {
bootarg_vnode_cache_defeat = 1;
}
#if DEVELOPMENT || DEBUG
if (PE_parse_boot_argn("-disable_aslr", namep, sizeof(namep))) {
bootarg_disable_aslr = 1;
}
#endif
PE_parse_boot_argn("ncl", &ncl, sizeof(ncl));
if (PE_parse_boot_argn("nbuf", &max_nbuf_headers,
sizeof(max_nbuf_headers))) {
customnbuf = 1;
}
#if CONFIG_MACF
#if defined (__i386__) || defined (__x86_64__)
PE_parse_boot_argn("policy_check", &policy_check_flags, sizeof(policy_check_flags));
#endif
#endif /* CONFIG_MACF */
if (PE_parse_boot_argn("msgbuf", &msgbuf, sizeof(msgbuf))) {
log_setsize(msgbuf);
oslog_setsize(msgbuf);
}
if (PE_parse_boot_argn("-novfscache", namep, sizeof(namep))) {
nc_disabled = 1;
}
#if CONFIG_JETSAM && (DEVELOPMENT || DEBUG)
if (PE_parse_boot_argn("-no_vnode_jetsam", namep, sizeof(namep))) {
bootarg_no_vnode_jetsam = 1;
}
#endif /* CONFIG_JETSAM && (DEVELOPMENT || DEBUG) */
if (PE_parse_boot_argn("-no_vnode_drain", namep, sizeof(namep))) {
bootarg_no_vnode_drain = 1;
}
#if CONFIG_DARKBOOT
/*
* The darkboot flag is specified by the bootloader and is stored in
* boot_args->bootFlags. This flag is available starting revision 2.
*/
boot_args *args = (boot_args *) PE_state.bootArgs;
if ((args != NULL) && (args->Revision >= kBootArgsRevision2)) {
darkboot = (args->bootFlags & kBootFlagsDarkBoot) ? 1 : 0;
} else {
darkboot = 0;
}
#endif
#if PROC_REF_DEBUG
if (PE_parse_boot_argn("-disable_procref_tracking", namep, sizeof(namep))) {
proc_ref_tracking_disabled = 1;
}
#endif
PE_parse_boot_argn("sigrestrict", &sigrestrict_arg, sizeof(sigrestrict_arg));
#if DEVELOPMENT || DEBUG
if (PE_parse_boot_argn("-no_sigsys", namep, sizeof(namep))) {
send_sigsys = false;
}
if (PE_parse_boot_argn("alt-dyld", dyld_alt_path, sizeof(dyld_alt_path))) {
if (strlen(dyld_alt_path) > 0) {
use_alt_dyld = 1;
}
}
PE_parse_boot_argn("dyld_flags", &dyld_flags, sizeof(dyld_flags));
if (PE_parse_boot_argn("-disable_syscallfilter", &namep, sizeof(namep))) {
syscallfilter_disable = 1;
}
#if __arm64__
if (PE_parse_boot_argn("legacy_footprint_entitlement_mode", &legacy_footprint_entitlement_mode, sizeof(legacy_footprint_entitlement_mode))) {
/*
* legacy_footprint_entitlement_mode specifies the behavior we want associated
* with the entitlement. The supported modes are:
*
* LEGACY_FOOTPRINT_ENTITLEMENT_IGNORE:
* Indicates that we want every process to have the memory accounting
* that is available in iOS 12.0 and beyond.
*
* LEGACY_FOOTPRINT_ENTITLEMENT_IOS11_ACCT:
* Indicates that for every process that has the 'legacy footprint entitlement',
* we want to give it the old iOS 11.0 accounting behavior which accounted some
* of the process's memory to the kernel.
*
* LEGACY_FOOTPRINT_ENTITLEMENT_LIMIT_INCREASE:
* Indicates that for every process that has the 'legacy footprint entitlement',
* we want it to have a higher memory limit which will help them acclimate to the
* iOS 12.0 (& beyond) accounting behavior that does the right accounting.
* The bonus added to the system-wide task limit to calculate this higher memory limit
* is available in legacy_footprint_bonus_mb.
*/
if (legacy_footprint_entitlement_mode < LEGACY_FOOTPRINT_ENTITLEMENT_IGNORE ||
legacy_footprint_entitlement_mode > LEGACY_FOOTPRINT_ENTITLEMENT_LIMIT_INCREASE) {
legacy_footprint_entitlement_mode = LEGACY_FOOTPRINT_ENTITLEMENT_LIMIT_INCREASE;
}
}
#endif /* __arm64__ */
#endif /* DEVELOPMENT || DEBUG */
}
#if CONFIG_BASESYSTEMROOT
extern const char* IOGetBootUUID(void);
extern const char* IOGetApfsPrebootUUID(void);
// Get the UUID of the Preboot (and Recovery) folder associated with the
// current boot volume, if applicable. The meaning of the UUID can be
// filesystem-dependent and not all kinds of boots will have a UUID.
// If available, the string will be returned. It does not need to be
// deallocate. (Future: if we need to return the string as a copy that the
// caller must free, we'll introduce a new functcion for that.)
// NULL will be returned if the current boot has no applicable Preboot UUID.
static
const char *
get_preboot_uuid(void)
{
const char *maybe_uuid_string;
// try IOGetApfsPrebootUUID
maybe_uuid_string = IOGetApfsPrebootUUID();
if (maybe_uuid_string) {
uuid_t maybe_uuid;
int error = uuid_parse(maybe_uuid_string, maybe_uuid);
if (error == 0) {
return maybe_uuid_string;
}
}
// try IOGetBootUUID
maybe_uuid_string = IOGetBootUUID();
if (maybe_uuid_string) {
uuid_t maybe_uuid;
int error = uuid_parse(maybe_uuid_string, maybe_uuid);
if (error == 0) {
return maybe_uuid_string;
}
}
// didn't find it
return NULL;
}
#if defined(__arm64__)
extern const char *IOGetBootObjectsPath(void);
#endif
// Find the BaseSystem.dmg to be used as the initial root volume during certain
// kinds of boots.
// This may mount volumes and lookup vnodes.
// The DEVELOPMENT kernel will look for BaseSystem.rooted.dmg first.
// If it returns 0 (no error), then it also writes the absolute path to the
// BaseSystem.dmg into its argument (which must be a char[MAXPATHLEN]).
static
int
bsd_find_basesystem_dmg(char *bsdmgpath_out, bool *rooted_dmg, bool *skip_signature_check)
{
int error;
size_t len;
char *dmgbasepath;
char *dmgpath;
bool allow_rooted_dmg = false;
dmgbasepath = zalloc_flags(ZV_NAMEI, Z_ZERO | Z_WAITOK);
dmgpath = zalloc_flags(ZV_NAMEI, Z_ZERO | Z_WAITOK);
vnode_t imagevp = NULLVP;
#if DEVELOPMENT || DEBUG
allow_rooted_dmg = true;
#endif
//must provide output bool
if (rooted_dmg && skip_signature_check) {
*rooted_dmg = false;
*skip_signature_check = false;
} else {
error = EINVAL;
goto done;
}
error = vfs_mount_recovery();
if (error) {
goto done;
}
len = strlcpy(dmgbasepath, "/System/Volumes/Recovery/", MAXPATHLEN);
if (len > MAXPATHLEN) {
error = ENAMETOOLONG;
goto done;
}
if (csr_check(CSR_ALLOW_ANY_RECOVERY_OS) == 0) {
*skip_signature_check = true;
allow_rooted_dmg = true;
}
#if defined(__arm64__)
const char *boot_obj_path = IOGetBootObjectsPath();
if (boot_obj_path) {
if (boot_obj_path[0] == '/') {
dmgbasepath[len - 1] = '\0';
}
len = strlcat(dmgbasepath, boot_obj_path, MAXPATHLEN);
if (len > MAXPATHLEN) {
error = ENAMETOOLONG;
goto done;
}
len = strlcat(dmgbasepath, "/usr/standalone/firmware/", MAXPATHLEN);
if (len > MAXPATHLEN) {
error = ENAMETOOLONG;
goto done;
}
if (allow_rooted_dmg) {
len = strlcpy(dmgpath, dmgbasepath, MAXPATHLEN);
if (len > MAXPATHLEN) {
error = ENAMETOOLONG;
goto done;
}
len = strlcat(dmgpath, "arm64eBaseSystem.rooted.dmg", MAXPATHLEN);
if (len > MAXPATHLEN) {
error = ENAMETOOLONG;
goto done;
}
error = vnode_lookup(dmgpath, 0, &imagevp, vfs_context_kernel());
if (error == 0) {
*rooted_dmg = true;
*skip_signature_check = true;
goto done;
}
memset(dmgpath, 0, MAXPATHLEN);
}
len = strlcpy(dmgpath, dmgbasepath, MAXPATHLEN);
if (len > MAXPATHLEN) {
error = ENAMETOOLONG;
goto done;
}
len = strlcat(dmgpath, "arm64eBaseSystem.dmg", MAXPATHLEN);
if (len > MAXPATHLEN) {
error = ENAMETOOLONG;
goto done;
}
error = vnode_lookup(dmgpath, 0, &imagevp, vfs_context_kernel());
if (error == 0) {
goto done;
}
memset(dmgpath, 0, MAXPATHLEN);
dmgbasepath[strlen("/System/Volumes/Recovery/")] = '\0';
}
#endif // __arm64__
const char *preboot_uuid = get_preboot_uuid();
if (preboot_uuid == NULL) {
// no preboot? bail out
return EINVAL;
}
len = strlcat(dmgbasepath, preboot_uuid, MAXPATHLEN);
if (len > MAXPATHLEN) {
error = ENAMETOOLONG;
goto done;
}
if (allow_rooted_dmg) {
// Try BaseSystem.rooted.dmg
len = strlcpy(dmgpath, dmgbasepath, MAXPATHLEN);
if (len > MAXPATHLEN) {
error = ENAMETOOLONG;
goto done;
}
len = strlcat(dmgpath, "/BaseSystem.rooted.dmg", MAXPATHLEN);
if (len > MAXPATHLEN) {
error = ENAMETOOLONG;
goto done;
}
error = vnode_lookup(dmgpath, 0, &imagevp, vfs_context_kernel());
if (error == 0) {
// we found it! success!
*rooted_dmg = true;
*skip_signature_check = true;
goto done;
}
}
// Try BaseSystem.dmg
len = strlcpy(dmgpath, dmgbasepath, MAXPATHLEN);
if (len > MAXPATHLEN) {
error = ENAMETOOLONG;
goto done;
}
len = strlcat(dmgpath, "/BaseSystem.dmg", MAXPATHLEN);
if (len > MAXPATHLEN) {
error = ENAMETOOLONG;
goto done;
}
error = vnode_lookup(dmgpath, 0, &imagevp, vfs_context_kernel());
if (error == 0) {
// success!
goto done;
}
done:
if (error == 0) {
strlcpy(bsdmgpath_out, dmgpath, MAXPATHLEN);
} else {
bsd_init_kprintf("%s: error %d\n", __func__, error);
}
if (imagevp != NULLVP) {
vnode_put(imagevp);
}
zfree(ZV_NAMEI, dmgpath);
zfree(ZV_NAMEI, dmgbasepath);
return error;
}
static boolean_t
bsdmgroot_bootable(void)
{
#if defined(__arm64__)
#define BSDMGROOT_DEFAULT true
#else
#define BSDMGROOT_DEFAULT false
#endif
boolean_t resolved = BSDMGROOT_DEFAULT;
boolean_t boot_arg_bsdmgroot = false;
boolean_t boot_arg_nobsdmgroot = false;
int error;
mount_t mp;
boolean_t root_part_of_volume_group = false;
struct vfs_attr vfsattr;
mp = rootvnode->v_mount;
VFSATTR_INIT(&vfsattr);
VFSATTR_WANTED(&vfsattr, f_capabilities);
boot_arg_bsdmgroot = PE_parse_boot_argn("-bsdmgroot", NULL, 0);
boot_arg_nobsdmgroot = PE_parse_boot_argn("-nobsdmgroot", NULL, 0);
error = vfs_getattr(mp, &vfsattr, vfs_context_kernel());
if (!error && VFSATTR_IS_SUPPORTED(&vfsattr, f_capabilities)) {
if ((vfsattr.f_capabilities.capabilities[VOL_CAPABILITIES_FORMAT] & VOL_CAP_FMT_VOL_GROUPS) &&
(vfsattr.f_capabilities.valid[VOL_CAPABILITIES_FORMAT] & VOL_CAP_FMT_VOL_GROUPS)) {
root_part_of_volume_group = true;
}
}
boolean_t singleuser = (boothowto & RB_SINGLE) != 0;
// Start with the #defined default above.
// If booting to single-user mode, default to false, because single-
// user mode inside the BaseSystem is probably not what's wanted.
// If the 'yes' boot-arg is set, we'll allow that even in single-user
// mode, we'll assume you know what you're doing.
// The 'no' boot-arg overpowers the 'yes' boot-arg.
// In any case, we will not attempt to root from BaseSystem if the
// original (booter-chosen) root volume isn't in a volume group.
// This is just out of an abundance of caution: if the boot environment
// seems to be "something other than a standard install",
// we'll be conservative in messing with the root volume.
if (singleuser) {
resolved = false;
}
if (boot_arg_bsdmgroot) {
resolved = true;
}
if (boot_arg_nobsdmgroot) {
resolved = false;
}
if (!root_part_of_volume_group) {
resolved = false;
}
return resolved;
}
#endif // CONFIG_BASESYSTEMROOT
void
bsd_exec_setup(int scale)
{
switch (scale) {
case 0:
case 1:
bsd_simul_execs = BSD_SIMUL_EXECS;
break;
case 2:
case 3:
bsd_simul_execs = 65;
break;
case 4:
case 5:
bsd_simul_execs = 129;
break;
case 6:
case 7:
bsd_simul_execs = 257;
break;
default:
bsd_simul_execs = 513;
break;
}
bsd_pageable_map_size = (bsd_simul_execs * BSD_PAGEABLE_SIZE_PER_EXEC);
}
#if !CONFIG_NETBOOT
int
netboot_root(void);
int
netboot_root(void)
{
return 0;
}
#endif
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