/* $NetBSD: init_sysctl.c,v 1.228 2023/09/09 16:01:09 christos Exp $ */

/* $NetBSD: init_sysctl.c,v 1.228 2023/09/09 16:01:09 christos Exp $ */

/*-
* Copyright (c) 2003, 2007, 2008, 2009 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Andrew Brown, and by Andrew Doran.
*
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. 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 FOUNDATION 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.
*/

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: init_sysctl.c,v 1.228 2023/09/09 16:01:09 christos Exp $");

#include "opt_sysv.h"
#include "opt_compat_netbsd.h"
#include "opt_modular.h"
#include "opt_gprof.h"
#include "pty.h"

#include <sys/param.h>
#include <sys/types.h>

#include <dev/cons.h>
#include <sys/conf.h>
#include <sys/cprng.h>
#include <sys/cpu.h>
#include <sys/device.h>
#include <sys/disklabel.h>
#include <sys/errno.h>
#include <sys/exec.h>
#include <sys/filedesc.h>
#include <sys/file.h>
#include <sys/kauth.h>
#include <sys/kernel.h>
#include <sys/kmem.h>
#include <sys/ktrace.h>
#include <sys/mount.h>
#include <sys/namei.h>
#include <sys/reboot.h>
#include <sys/resource.h>
#include <sys/resourcevar.h>
#include <sys/socketvar.h>
#include <sys/stat.h>
#include <sys/sysctl.h>
#include <sys/systm.h>
#include <sys/tty.h>
#include <sys/unistd.h>
#include <sys/vnode_impl.h> /* For vfs_drainvnodes(). */

int security_setidcore_dump;
char security_setidcore_path[MAXPATHLEN] = "/var/crash/%n.core";
uid_t security_setidcore_owner = 0;
gid_t security_setidcore_group = 0;
mode_t security_setidcore_mode = (S_IRUSR|S_IWUSR);

/*
* Current status of SysV IPC capability. Initially, these are
* 0 if the capability is not built-in to the kernel, but can
* be updated if the appropriate kernel module is (auto)loaded.
*/

int kern_has_sysvmsg = 0;
int kern_has_sysvshm = 0;
int kern_has_sysvsem = 0;

static const u_int sysctl_lwpprflagmap[] = {
LPR_DETACHED, L_DETACHED,
0
};

/*
* try over estimating by 5 procs/lwps
*/
#define KERN_LWPSLOP (5 * sizeof(struct kinfo_lwp))

static int dcopyout(struct lwp *, const void *, void *, size_t);

static int
dcopyout(struct lwp *l, const void *kaddr, void *uaddr, size_t len)
{
int error;

error = copyout(kaddr, uaddr, len);
ktrmibio(-1, UIO_READ, uaddr, len, error);

return error;
}

static int sysctl_kern_maxvnodes(SYSCTLFN_PROTO);
static int sysctl_kern_messages(SYSCTLFN_PROTO);
static int sysctl_kern_boottime(SYSCTLFN_PROTO);
static int sysctl_kern_rtc_offset(SYSCTLFN_PROTO);
static int sysctl_kern_maxproc(SYSCTLFN_PROTO);
static int sysctl_kern_hostid(SYSCTLFN_PROTO);
static int sysctl_kern_defcorename(SYSCTLFN_PROTO);
static int sysctl_kern_cptime(SYSCTLFN_PROTO);
#if NPTY > 0
static int sysctl_kern_maxptys(SYSCTLFN_PROTO);
#endif /* NPTY > 0 */
static int sysctl_kern_lwp(SYSCTLFN_PROTO);
static int sysctl_kern_forkfsleep(SYSCTLFN_PROTO);
static int sysctl_kern_root_partition(SYSCTLFN_PROTO);
static int sysctl_kern_drivers(SYSCTLFN_PROTO);
static int sysctl_security_setidcore(SYSCTLFN_PROTO);
static int sysctl_security_setidcorename(SYSCTLFN_PROTO);
static int sysctl_kern_cpid(SYSCTLFN_PROTO);
static int sysctl_hw_usermem(SYSCTLFN_PROTO);
static int sysctl_hw_cnmagic(SYSCTLFN_PROTO);

static void fill_lwp(struct lwp *l, struct kinfo_lwp *kl);

/*
* ********************************************************************
* section 1: setup routines
* ********************************************************************
* These functions are stuffed into a link set for sysctl setup
* functions. They're never called or referenced from anywhere else.
* ********************************************************************
*/

/*
* this setup routine is a replacement for kern_sysctl()
*/
SYSCTL_SETUP(sysctl_kern_setup, "sysctl kern subtree setup")
{
extern int kern_logsigexit; /* defined in kern/kern_sig.c */
extern fixpt_t ccpu; /* defined in kern/kern_synch.c */
extern int dumponpanic; /* defined in kern/subr_prf.c */
const struct sysctlnode *rnode;

sysctl_createv(clog, 0, NULL, NULL,
CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
CTLTYPE_INT, "maxvnodes",
SYSCTL_DESCR("Maximum number of vnodes"),
sysctl_kern_maxvnodes, 0, NULL, 0,
CTL_KERN, KERN_MAXVNODES, CTL_EOL);
sysctl_createv(clog, 0, NULL, NULL,
CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
CTLTYPE_INT, "maxproc",
SYSCTL_DESCR("Maximum number of simultaneous processes"),
sysctl_kern_maxproc, 0, NULL, 0,
CTL_KERN, KERN_MAXPROC, CTL_EOL);
sysctl_createv(clog, 0, NULL, NULL,
CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
CTLTYPE_INT, "maxfiles",
SYSCTL_DESCR("Maximum number of open files"),
NULL, 0, &maxfiles, 0,
CTL_KERN, KERN_MAXFILES, CTL_EOL);
sysctl_createv(clog, 0, NULL, NULL,
CTLFLAG_PERMANENT|CTLFLAG_IMMEDIATE,
CTLTYPE_INT, "argmax",
SYSCTL_DESCR("Maximum number of bytes of arguments to "
"execve(2)"),
NULL, ARG_MAX, NULL, 0,
CTL_KERN, KERN_ARGMAX, CTL_EOL);
sysctl_createv(clog, 0, NULL, NULL,
CTLFLAG_PERMANENT|CTLFLAG_READWRITE|CTLFLAG_HEX,
CTLTYPE_INT, "hostid",
SYSCTL_DESCR("System host ID number"),
sysctl_kern_hostid, 0, NULL, 0,
CTL_KERN, KERN_HOSTID, CTL_EOL);
sysctl_createv(clog, 0, NULL, NULL,
CTLFLAG_PERMANENT,
CTLTYPE_STRUCT, "vnode",
SYSCTL_DESCR("System vnode table"),
sysctl_kern_vnode, 0, NULL, 0,
CTL_KERN, KERN_VNODE, CTL_EOL);
#ifndef GPROF
sysctl_createv(clog, 0, NULL, NULL,
CTLFLAG_PERMANENT,
CTLTYPE_NODE, "profiling",
SYSCTL_DESCR("Profiling information (not available)"),
sysctl_notavail, 0, NULL, 0,
CTL_KERN, KERN_PROF, CTL_EOL);
#endif
sysctl_createv(clog, 0, NULL, NULL,
CTLFLAG_PERMANENT|CTLFLAG_IMMEDIATE,
CTLTYPE_INT, "posix1version",
SYSCTL_DESCR("Version of ISO/IEC 9945 (POSIX 1003.1) "
"with which the operating system attempts "
"to comply"),
NULL, _POSIX_VERSION, NULL, 0,
CTL_KERN, KERN_POSIX1, CTL_EOL);
sysctl_createv(clog, 0, NULL, NULL,
CTLFLAG_PERMANENT|CTLFLAG_IMMEDIATE,
CTLTYPE_INT, "ngroups",
SYSCTL_DESCR("Maximum number of supplemental groups"),
NULL, NGROUPS_MAX, NULL, 0,
CTL_KERN, KERN_NGROUPS, CTL_EOL);
sysctl_createv(clog, 0, NULL, NULL,
CTLFLAG_PERMANENT|CTLFLAG_IMMEDIATE,
CTLTYPE_INT, "job_control",
SYSCTL_DESCR("Whether job control is available"),
NULL, 1, NULL, 0,
CTL_KERN, KERN_JOB_CONTROL, CTL_EOL);
sysctl_createv(clog, 0, NULL, NULL,
CTLFLAG_PERMANENT|CTLFLAG_IMMEDIATE,
CTLTYPE_INT, "saved_ids",
SYSCTL_DESCR("Whether POSIX saved set-group/user ID is "
"available"), NULL,
#ifdef _POSIX_SAVED_IDS
1,
#else /* _POSIX_SAVED_IDS */
0,
#endif /* _POSIX_SAVED_IDS */
NULL, 0, CTL_KERN, KERN_SAVED_IDS, CTL_EOL);
sysctl_createv(clog, 0, NULL, NULL,
CTLFLAG_PERMANENT|CTLFLAG_HEX,
CTLTYPE_INT, "boothowto",
SYSCTL_DESCR("Flags from boot loader"),
NULL, 0, &boothowto, sizeof(boothowto),
CTL_KERN, CTL_CREATE, CTL_EOL);
sysctl_createv(clog, 0, NULL, NULL,
CTLFLAG_PERMANENT,
CTLTYPE_STRUCT, "boottime",
SYSCTL_DESCR("System boot time"),
sysctl_kern_boottime, 0, NULL, sizeof(struct timespec),
CTL_KERN, KERN_BOOTTIME, CTL_EOL);
sysctl_createv(clog, 0, NULL, NULL,
CTLFLAG_PERMANENT|CTLFLAG_IMMEDIATE,
CTLTYPE_INT, "maxpartitions",
SYSCTL_DESCR("Maximum number of partitions allowed per "
"disk"),
NULL, MAXPARTITIONS, NULL, 0,
CTL_KERN, KERN_MAXPARTITIONS, CTL_EOL);
sysctl_createv(clog, 0, NULL, NULL,
CTLFLAG_PERMANENT,
CTLTYPE_STRUCT, "timex", NULL,
sysctl_notavail, 0, NULL, 0,
CTL_KERN, KERN_TIMEX, CTL_EOL);
sysctl_createv(clog, 0, NULL, NULL,
CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
CTLTYPE_INT, "rtc_offset",
SYSCTL_DESCR("Offset of real time clock from UTC in "
"minutes"),
sysctl_kern_rtc_offset, 0, &rtc_offset, 0,
CTL_KERN, KERN_RTC_OFFSET, CTL_EOL);
sysctl_createv(clog, 0, NULL, NULL,
CTLFLAG_PERMANENT,
CTLTYPE_STRING, "root_device",
SYSCTL_DESCR("Name of the root device"),
sysctl_root_device, 0, NULL, 0,
CTL_KERN, KERN_ROOT_DEVICE, CTL_EOL);
sysctl_createv(clog, 0, NULL, NULL,
CTLFLAG_PERMANENT|CTLFLAG_IMMEDIATE,
CTLTYPE_INT, "fsync",
SYSCTL_DESCR("Whether the POSIX 1003.1b File "
"Synchronization Option is available on "
"this system"),
NULL, 1, NULL, 0,
CTL_KERN, KERN_FSYNC, CTL_EOL);
sysctl_createv(clog, 0, NULL, NULL,
CTLFLAG_PERMANENT,
CTLTYPE_NODE, "ipc",
SYSCTL_DESCR("SysV IPC options"),
NULL, 0, NULL, 0,
CTL_KERN, KERN_SYSVIPC, CTL_EOL);
sysctl_createv(clog, 0, NULL, NULL,
CTLFLAG_PERMANENT|CTLFLAG_READONLY,
CTLTYPE_INT, "sysvmsg",
SYSCTL_DESCR("System V style message support available"),
NULL, 0, &kern_has_sysvmsg, sizeof(int),
CTL_KERN, KERN_SYSVIPC, KERN_SYSVIPC_MSG, CTL_EOL);
sysctl_createv(clog, 0, NULL, NULL,
CTLFLAG_PERMANENT|CTLFLAG_READONLY,
CTLTYPE_INT, "sysvsem",
SYSCTL_DESCR("System V style semaphore support "
"available"),
NULL, 0, &kern_has_sysvsem, sizeof(int),
CTL_KERN, KERN_SYSVIPC, KERN_SYSVIPC_SEM, CTL_EOL);
sysctl_createv(clog, 0, NULL, NULL,
CTLFLAG_PERMANENT|CTLFLAG_READONLY,
CTLTYPE_INT, "sysvshm",
SYSCTL_DESCR("System V style shared memory support "
"available"),
NULL, 0, &kern_has_sysvshm, sizeof(int),
CTL_KERN, KERN_SYSVIPC, KERN_SYSVIPC_SHM, CTL_EOL);
sysctl_createv(clog, 0, NULL, NULL,
CTLFLAG_PERMANENT|CTLFLAG_IMMEDIATE,
CTLTYPE_INT, "synchronized_io",
SYSCTL_DESCR("Whether the POSIX 1003.1b Synchronized "
"I/O Option is available on this system"),
NULL, 1, NULL, 0,
CTL_KERN, KERN_SYNCHRONIZED_IO, CTL_EOL);
sysctl_createv(clog, 0, NULL, NULL,
CTLFLAG_PERMANENT|CTLFLAG_IMMEDIATE,
CTLTYPE_INT, "iov_max",
SYSCTL_DESCR("Maximum number of iovec structures per "
"process"),
NULL, IOV_MAX, NULL, 0,
CTL_KERN, KERN_IOV_MAX, CTL_EOL);
sysctl_createv(clog, 0, NULL, NULL,
CTLFLAG_PERMANENT|CTLFLAG_IMMEDIATE,
CTLTYPE_INT, "mapped_files",
SYSCTL_DESCR("Whether the POSIX 1003.1b Memory Mapped "
"Files Option is available on this system"),
NULL, 1, NULL, 0,
CTL_KERN, KERN_MAPPED_FILES, CTL_EOL);
sysctl_createv(clog, 0, NULL, NULL,
CTLFLAG_PERMANENT|CTLFLAG_IMMEDIATE,
CTLTYPE_INT, "memlock",
SYSCTL_DESCR("Whether the POSIX 1003.1b Process Memory "
"Locking Option is available on this "
"system"),
NULL, 1, NULL, 0,
CTL_KERN, KERN_MEMLOCK, CTL_EOL);
sysctl_createv(clog, 0, NULL, NULL,
CTLFLAG_PERMANENT|CTLFLAG_IMMEDIATE,
CTLTYPE_INT, "memlock_range",
SYSCTL_DESCR("Whether the POSIX 1003.1b Range Memory "
"Locking Option is available on this "
"system"),
NULL, 1, NULL, 0,
CTL_KERN, KERN_MEMLOCK_RANGE, CTL_EOL);
sysctl_createv(clog, 0, NULL, NULL,
CTLFLAG_PERMANENT|CTLFLAG_IMMEDIATE,
CTLTYPE_INT, "memory_protection",
SYSCTL_DESCR("Whether the POSIX 1003.1b Memory "
"Protection Option is available on this "
"system"),
NULL, 1, NULL, 0,
CTL_KERN, KERN_MEMORY_PROTECTION, CTL_EOL);
sysctl_createv(clog, 0, NULL, NULL,
CTLFLAG_PERMANENT|CTLFLAG_IMMEDIATE,
CTLTYPE_INT, "login_name_max",
SYSCTL_DESCR("Maximum login name length"),
NULL, LOGIN_NAME_MAX, NULL, 0,
CTL_KERN, KERN_LOGIN_NAME_MAX, CTL_EOL);
sysctl_createv(clog, 0, NULL, NULL,
CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
CTLTYPE_STRING, "defcorename",
SYSCTL_DESCR("Default core file name"),
sysctl_kern_defcorename, 0, defcorename, MAXPATHLEN,
CTL_KERN, KERN_DEFCORENAME, CTL_EOL);
sysctl_createv(clog, 0, NULL, NULL,
CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
CTLTYPE_INT, "logsigexit",
SYSCTL_DESCR("Log process exit when caused by signals"),
NULL, 0, &kern_logsigexit, 0,
CTL_KERN, KERN_LOGSIGEXIT, CTL_EOL);
sysctl_createv(clog, 0, NULL, NULL,
CTLFLAG_PERMANENT|CTLFLAG_IMMEDIATE,
CTLTYPE_INT, "fscale",
SYSCTL_DESCR("Kernel fixed-point scale factor"),
NULL, FSCALE, NULL, 0,
CTL_KERN, KERN_FSCALE, CTL_EOL);
sysctl_createv(clog, 0, NULL, NULL,
CTLFLAG_PERMANENT,
CTLTYPE_INT, "ccpu",
SYSCTL_DESCR("Scheduler exponential decay value"),
NULL, 0, &ccpu, 0,
CTL_KERN, KERN_CCPU, CTL_EOL);
sysctl_createv(clog, 0, NULL, NULL,
CTLFLAG_PERMANENT,
CTLTYPE_STRUCT, "cp_time",
SYSCTL_DESCR("Clock ticks spent in different CPU states"),
sysctl_kern_cptime, 0, NULL, 0,
CTL_KERN, KERN_CP_TIME, CTL_EOL);
sysctl_createv(clog, 0, NULL, NULL,
CTLFLAG_PERMANENT,
CTLTYPE_STRUCT, "consdev",
SYSCTL_DESCR("Console device"),
sysctl_consdev, 0, NULL, sizeof(dev_t),
CTL_KERN, KERN_CONSDEV, CTL_EOL);
#if NPTY > 0
sysctl_createv(clog, 0, NULL, NULL,
CTLFLAG_PERMANENT,
CTLTYPE_INT, "maxptys",
SYSCTL_DESCR("Maximum number of pseudo-ttys"),
sysctl_kern_maxptys, 0, NULL, 0,
CTL_KERN, KERN_MAXPTYS, CTL_EOL);
#endif /* NPTY > 0 */
sysctl_createv(clog, 0, NULL, NULL,
CTLFLAG_PERMANENT|CTLFLAG_IMMEDIATE,
CTLTYPE_INT, "maxphys",
SYSCTL_DESCR("Maximum raw I/O transfer size"),
NULL, MAXPHYS, NULL, 0,
CTL_KERN, KERN_MAXPHYS, CTL_EOL);
sysctl_createv(clog, 0, NULL, NULL,
CTLFLAG_PERMANENT|CTLFLAG_IMMEDIATE,
CTLTYPE_INT, "monotonic_clock",
SYSCTL_DESCR("Implementation version of the POSIX "
"1003.1b Monotonic Clock Option"),
/* XXX _POSIX_VERSION */
NULL, _POSIX_MONOTONIC_CLOCK, NULL, 0,
CTL_KERN, KERN_MONOTONIC_CLOCK, CTL_EOL);
sysctl_createv(clog, 0, NULL, NULL,
CTLFLAG_PERMANENT|CTLFLAG_IMMEDIATE,
CTLTYPE_INT, "labelsector",
SYSCTL_DESCR("Sector number containing the disklabel"),
NULL, LABELSECTOR, NULL, 0,
CTL_KERN, KERN_LABELSECTOR, CTL_EOL);
sysctl_createv(clog, 0, NULL, NULL,
CTLFLAG_PERMANENT|CTLFLAG_IMMEDIATE,
CTLTYPE_INT, "labeloffset",
SYSCTL_DESCR("Offset of the disklabel within the "
"sector"),
NULL, LABELOFFSET, NULL, 0,
CTL_KERN, KERN_LABELOFFSET, CTL_EOL);
sysctl_createv(clog, 0, NULL, NULL,
CTLFLAG_PERMANENT|CTLFLAG_IMMEDIATE,
CTLTYPE_INT, "labelusesmbr",
SYSCTL_DESCR("disklabel is inside MBR partition"),
NULL, LABELUSESMBR, NULL, 0,
CTL_KERN, CTL_CREATE, CTL_EOL);
sysctl_createv(clog, 0, NULL, NULL,
CTLFLAG_PERMANENT,
CTLTYPE_NODE, "lwp",
SYSCTL_DESCR("System-wide LWP information"),
sysctl_kern_lwp, 0, NULL, 0,
CTL_KERN, KERN_LWP, CTL_EOL);
sysctl_createv(clog, 0, NULL, NULL,
CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
CTLTYPE_INT, "forkfsleep",
SYSCTL_DESCR("Milliseconds to sleep on fork failure due "
"to process limits"),
sysctl_kern_forkfsleep, 0, NULL, 0,
CTL_KERN, KERN_FORKFSLEEP, CTL_EOL);
sysctl_createv(clog, 0, NULL, NULL,
CTLFLAG_PERMANENT|CTLFLAG_IMMEDIATE,
CTLTYPE_INT, "posix_threads",
SYSCTL_DESCR("Version of IEEE Std 1003.1 and its "
"Threads option to which the system "
"attempts to conform"),
/* XXX _POSIX_VERSION */
NULL, _POSIX_THREADS, NULL, 0,
CTL_KERN, KERN_POSIX_THREADS, CTL_EOL);
sysctl_createv(clog, 0, NULL, NULL,
CTLFLAG_PERMANENT|CTLFLAG_IMMEDIATE,
CTLTYPE_INT, "posix_semaphores",
SYSCTL_DESCR("Version of IEEE Std 1003.1 and its "
"Semaphores option to which the system "
"attempts to conform"), NULL,
200112, NULL, 0,
CTL_KERN, KERN_POSIX_SEMAPHORES, CTL_EOL);
sysctl_createv(clog, 0, NULL, NULL,
CTLFLAG_PERMANENT|CTLFLAG_IMMEDIATE,
CTLTYPE_INT, "posix_barriers",
SYSCTL_DESCR("Version of IEEE Std 1003.1 and its "
"Barriers option to which the system "
"attempts to conform"),
/* XXX _POSIX_VERSION */
NULL, _POSIX_BARRIERS, NULL, 0,
CTL_KERN, KERN_POSIX_BARRIERS, CTL_EOL);
sysctl_createv(clog, 0, NULL, NULL,
CTLFLAG_PERMANENT|CTLFLAG_IMMEDIATE,
CTLTYPE_INT, "posix_timers",
SYSCTL_DESCR("Version of IEEE Std 1003.1 and its "
"Timers option to which the system "
"attempts to conform"),
/* XXX _POSIX_VERSION */
NULL, _POSIX_TIMERS, NULL, 0,
CTL_KERN, KERN_POSIX_TIMERS, CTL_EOL);
sysctl_createv(clog, 0, NULL, NULL,
CTLFLAG_PERMANENT|CTLFLAG_IMMEDIATE,
CTLTYPE_INT, "posix_spin_locks",
SYSCTL_DESCR("Version of IEEE Std 1003.1 and its Spin "
"Locks option to which the system attempts "
"to conform"),
/* XXX _POSIX_VERSION */
NULL, _POSIX_SPIN_LOCKS, NULL, 0,
CTL_KERN, KERN_POSIX_SPIN_LOCKS, CTL_EOL);
sysctl_createv(clog, 0, NULL, NULL,
CTLFLAG_PERMANENT|CTLFLAG_IMMEDIATE,
CTLTYPE_INT, "posix_reader_writer_locks",
SYSCTL_DESCR("Version of IEEE Std 1003.1 and its "
"Read-Write Locks option to which the "
"system attempts to conform"),
/* XXX _POSIX_VERSION */
NULL, _POSIX_READER_WRITER_LOCKS, NULL, 0,
CTL_KERN, KERN_POSIX_READER_WRITER_LOCKS, CTL_EOL);
sysctl_createv(clog, 0, NULL, NULL,
CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
CTLTYPE_INT, "dump_on_panic",
SYSCTL_DESCR("Perform a crash dump on system panic"),
NULL, 0, &dumponpanic, 0,
CTL_KERN, KERN_DUMP_ON_PANIC, CTL_EOL);
sysctl_createv(clog, 0, NULL, NULL,
CTLFLAG_PERMANENT,
CTLTYPE_INT, "root_partition",
SYSCTL_DESCR("Root partition on the root device"),
sysctl_kern_root_partition, 0, NULL, 0,
CTL_KERN, KERN_ROOT_PARTITION, CTL_EOL);
sysctl_createv(clog, 0, NULL, NULL,
CTLFLAG_PERMANENT,
CTLTYPE_STRUCT, "drivers",
SYSCTL_DESCR("List of all drivers with block and "
"character device numbers"),
sysctl_kern_drivers, 0, NULL, 0,
CTL_KERN, KERN_DRIVERS, CTL_EOL);
sysctl_createv(clog, 0, NULL, NULL,
CTLFLAG_PERMANENT,
CTLTYPE_STRUCT, "cp_id",
SYSCTL_DESCR("Mapping of CPU number to CPU id"),
sysctl_kern_cpid, 0, NULL, 0,
CTL_KERN, KERN_CP_ID, CTL_EOL);
sysctl_createv(clog, 0, NULL, &rnode,
CTLFLAG_PERMANENT,
CTLTYPE_NODE, "coredump",
SYSCTL_DESCR("Coredump settings."),
NULL, 0, NULL, 0,
CTL_KERN, CTL_CREATE, CTL_EOL);
sysctl_createv(clog, 0, &rnode, &rnode,
CTLFLAG_PERMANENT,
CTLTYPE_NODE, "setid",
SYSCTL_DESCR("Set-id processes' coredump settings."),
NULL, 0, NULL, 0,
CTL_CREATE, CTL_EOL);
sysctl_createv(clog, 0, &rnode, NULL,
CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
CTLTYPE_INT, "dump",
SYSCTL_DESCR("Allow set-id processes to dump core."),
sysctl_security_setidcore, 0, &security_setidcore_dump,
sizeof(security_setidcore_dump),
CTL_CREATE, CTL_EOL);
sysctl_createv(clog, 0, &rnode, NULL,
CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
CTLTYPE_STRING, "path",
SYSCTL_DESCR("Path pattern for set-id coredumps."),
sysctl_security_setidcorename, 0,
security_setidcore_path,
sizeof(security_setidcore_path),
CTL_CREATE, CTL_EOL);
sysctl_createv(clog, 0, &rnode, NULL,
CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
CTLTYPE_INT, "owner",
SYSCTL_DESCR("Owner id for set-id processes' cores."),
sysctl_security_setidcore, 0, &security_setidcore_owner,
0,
CTL_CREATE, CTL_EOL);
sysctl_createv(clog, 0, &rnode, NULL,
CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
CTLTYPE_INT, "group",
SYSCTL_DESCR("Group id for set-id processes' cores."),
sysctl_security_setidcore, 0, &security_setidcore_group,
0,
CTL_CREATE, CTL_EOL);
sysctl_createv(clog, 0, &rnode, NULL,
CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
CTLTYPE_INT, "mode",
SYSCTL_DESCR("Mode for set-id processes' cores."),
sysctl_security_setidcore, 0, &security_setidcore_mode,
0,
CTL_CREATE, CTL_EOL);
sysctl_createv(clog, 0, NULL, NULL,
CTLFLAG_IMMEDIATE|CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
CTLTYPE_INT, "no_sa_support",
SYSCTL_DESCR("0 if the kernel supports SA, otherwise "
"it doesn't"),
NULL, 1, NULL, 0,
CTL_KERN, CTL_CREATE, CTL_EOL);
sysctl_createv(clog, 0, NULL, NULL,
CTLFLAG_PERMANENT,
CTLTYPE_STRING, "configname",
SYSCTL_DESCR("Name of config file"),
NULL, 0, __UNCONST(kernel_ident), 0,
CTL_KERN, CTL_CREATE, CTL_EOL);
sysctl_createv(clog, 0, NULL, NULL,
CTLFLAG_PERMANENT,
CTLTYPE_STRING, "buildinfo",
SYSCTL_DESCR("Information from build environment"),
NULL, 0, __UNCONST(buildinfo), 0,
CTL_KERN, CTL_CREATE, CTL_EOL);
sysctl_createv(clog, 0, NULL, NULL,
CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
CTLTYPE_INT, "messages",
SYSCTL_DESCR("Kernel message verbosity"),
sysctl_kern_messages, 0, NULL, 0,
CTL_KERN, CTL_CREATE, CTL_EOL);
}

SYSCTL_SETUP(sysctl_hw_misc_setup, "sysctl hw subtree misc setup")
{

sysctl_createv(clog, 0, NULL, NULL,
CTLFLAG_PERMANENT,
CTLTYPE_INT, "usermem",
SYSCTL_DESCR("Bytes of non-kernel memory"),
sysctl_hw_usermem, 0, NULL, 0,
CTL_HW, HW_USERMEM, CTL_EOL);
sysctl_createv(clog, 0, NULL, NULL,
CTLFLAG_PERMANENT|CTLFLAG_READWRITE|CTLFLAG_HEX,
CTLTYPE_STRING, "cnmagic",
SYSCTL_DESCR("Console magic key sequence"),
sysctl_hw_cnmagic, 0, NULL, CNS_LEN,
CTL_HW, HW_CNMAGIC, CTL_EOL);
sysctl_createv(clog, 0, NULL, NULL,
CTLFLAG_PERMANENT,
CTLTYPE_QUAD, "usermem64",
SYSCTL_DESCR("Bytes of non-kernel memory"),
sysctl_hw_usermem, 0, NULL, 0,
CTL_HW, HW_USERMEM64, CTL_EOL);
}

#ifdef DEBUG
/*
* Debugging related system variables.
*/
struct ctldebug /* debug0, */ /* debug1, */ debug2, debug3, debug4;
struct ctldebug debug5, debug6, debug7, debug8, debug9;
struct ctldebug debug10, debug11, debug12, debug13, debug14;
struct ctldebug debug15, debug16, debug17, debug18, debug19;
static struct ctldebug *debugvars[] = {
&debug0, &debug1, &debug2, &debug3, &debug4,
&debug5, &debug6, &debug7, &debug8, &debug9,
&debug10, &debug11, &debug12, &debug13, &debug14,
&debug15, &debug16, &debug17, &debug18, &debug19,
};

/*
* this setup routine is a replacement for debug_sysctl()
*
* note that it creates several nodes per defined debug variable
*/
SYSCTL_SETUP(sysctl_debug_setup, "sysctl debug subtree setup")
{
struct ctldebug *cdp;
char nodename[20];
int i;

/*
* two ways here:
*
* the "old" way (debug.name -> value) which was emulated by
* the sysctl(8) binary
*
* the new way, which the sysctl(8) binary was actually using

node debug
node debug.0
string debug.0.name
int debug.0.value
int debug.name

*/

for (i = 0; i < __arraycount(debugvars); i++) {
cdp = debugvars[i];
if (cdp->debugname == NULL || cdp->debugvar == NULL)
continue;

snprintf(nodename, sizeof(nodename), "debug%d", i);
sysctl_createv(clog, 0, NULL, NULL,
CTLFLAG_PERMANENT|CTLFLAG_HIDDEN,
CTLTYPE_NODE, nodename, NULL,
NULL, 0, NULL, 0,
CTL_DEBUG, i, CTL_EOL);
sysctl_createv(clog, 0, NULL, NULL,
CTLFLAG_PERMANENT|CTLFLAG_HIDDEN,
CTLTYPE_STRING, "name", NULL,
/*XXXUNCONST*/
NULL, 0, __UNCONST(cdp->debugname), 0,
CTL_DEBUG, i, CTL_DEBUG_NAME, CTL_EOL);
sysctl_createv(clog, 0, NULL, NULL,
CTLFLAG_PERMANENT|CTLFLAG_HIDDEN,
CTLTYPE_INT, "value", NULL,
NULL, 0, cdp->debugvar, 0,
CTL_DEBUG, i, CTL_DEBUG_VALUE, CTL_EOL);
sysctl_createv(clog, 0, NULL, NULL,
CTLFLAG_PERMANENT,
CTLTYPE_INT, cdp->debugname, NULL,
NULL, 0, cdp->debugvar, 0,
CTL_DEBUG, CTL_CREATE, CTL_EOL);
}
}
#endif /* DEBUG */

/*
* ********************************************************************
* section 2: private node-specific helper routines.
* ********************************************************************
*/

/*
* sysctl helper routine for kern.maxvnodes. Drain vnodes if
* new value is lower than desiredvnodes and then calls reinit
* routines that needs to adjust to the new value.
*/
static int
sysctl_kern_maxvnodes(SYSCTLFN_ARGS)
{
int error, new_vnodes, old_vnodes, new_max;
struct sysctlnode node;

new_vnodes = desiredvnodes;
node = *rnode;
node.sysctl_data = &new_vnodes;
error = sysctl_lookup(SYSCTLFN_CALL(&node));
if (error || newp == NULL)
return (error);

/*
* sysctl passes down unsigned values, require them
* to be positive
*/
if (new_vnodes <= 0)
return (EINVAL);

/* Limits: 75% of kmem and physical memory. */
new_max = calc_cache_size(vmem_size(kmem_arena, VMEM_FREE|VMEM_ALLOC),
75, 75) / VNODE_COST;
if (new_vnodes > new_max)
new_vnodes = new_max;

old_vnodes = desiredvnodes;
desiredvnodes = new_vnodes;
error = vfs_drainvnodes();
if (error) {
desiredvnodes = old_vnodes;
return (error);
}
vfs_reinit();

return (0);
}

/*
* sysctl helper routine for kern.messages.
* Alters boothowto to display kernel messages in increasing verbosity
* from 0 to 4.
*/

#define MAXMESSAGES 4
static int
sysctl_kern_messages(SYSCTLFN_ARGS)
{
int error, messageverbose, messagemask, newboothowto;
struct sysctlnode node;

messagemask = (AB_NORMAL|AB_QUIET|AB_SILENT|AB_VERBOSE|AB_DEBUG);
switch (boothowto & messagemask) {
case AB_SILENT:
messageverbose = 0;
break;
case AB_QUIET:
messageverbose = 1;
break;
case AB_VERBOSE:
messageverbose = 3;
break;
case AB_DEBUG:
messageverbose = 4;
break;
case AB_NORMAL:
default:
messageverbose = 2;
}

node = *rnode;
node.sysctl_data = &messageverbose;
error = sysctl_lookup(SYSCTLFN_CALL(&node));
if (error || newp == NULL)
return (error);
if (messageverbose < 0 || messageverbose > MAXMESSAGES)
return EINVAL;

/* Set boothowto */
newboothowto = boothowto & ~messagemask;

switch (messageverbose) {
case 0:
newboothowto |= AB_SILENT;
break;
case 1:
newboothowto |= AB_QUIET;
break;
case 3:
newboothowto |= AB_VERBOSE;
break;
case 4:
newboothowto |= AB_DEBUG;
break;
case 2:
default: /* Messages default to normal. */
break;
}

boothowto = newboothowto;

return (0);
}

/*
* sysctl helper routine for the kern.boottime node
*/
static int
sysctl_kern_boottime(SYSCTLFN_ARGS)
{
struct sysctlnode node;
struct timespec ts;

getnanoboottime(&ts);
node = *rnode;
node.sysctl_data = &ts;
return (sysctl_lookup(SYSCTLFN_CALL(&node)));
}

/*
* sysctl helper routine for rtc_offset - set time after changes
*/
static int
sysctl_kern_rtc_offset(SYSCTLFN_ARGS)
{
struct timespec ts, delta;
int error, new_rtc_offset;
struct sysctlnode node;

new_rtc_offset = rtc_offset;
node = *rnode;
node.sysctl_data = &new_rtc_offset;
error = sysctl_lookup(SYSCTLFN_CALL(&node));
if (error || newp == NULL)
return (error);

if (kauth_authorize_system(l->l_cred, KAUTH_SYSTEM_TIME,
KAUTH_REQ_SYSTEM_TIME_RTCOFFSET,
KAUTH_ARG(new_rtc_offset), NULL, NULL))
return (EPERM);
if (rtc_offset == new_rtc_offset)
return (0);

/* if we change the offset, adjust the time */
nanotime(&ts);
delta.tv_sec = 60 * (new_rtc_offset - rtc_offset);
delta.tv_nsec = 0;
timespecadd(&ts, &delta, &ts);
rtc_offset = new_rtc_offset;
return (settime(l->l_proc, &ts));
}

/*
* sysctl helper routine for kern.maxproc. Ensures that the new
* values are not too low or too high.
*/
static int
sysctl_kern_maxproc(SYSCTLFN_ARGS)
{
int error, nmaxproc;
struct sysctlnode node;

nmaxproc = maxproc;
node = *rnode;
node.sysctl_data = &nmaxproc;
error = sysctl_lookup(SYSCTLFN_CALL(&node));
if (error || newp == NULL)
return (error);

if (nmaxproc < 0 || nmaxproc >= PID_MAX)
return (EINVAL);
#ifdef __HAVE_CPU_MAXPROC
if (nmaxproc > cpu_maxproc())
return (EINVAL);
#endif
error = 0;
#ifdef __HAVE_MAXPROC_HOOK
error = cpu_maxproc_hook(nmaxproc);
#endif
if (error)
return error;

maxproc = nmaxproc;

return (0);
}

/*
* sysctl helper function for kern.hostid. The hostid is a long, but
* we export it as an int, so we need to give it a little help.
*/
static int
sysctl_kern_hostid(SYSCTLFN_ARGS)
{
int error, inthostid;
struct sysctlnode node;

inthostid = hostid; /* XXX assumes sizeof int <= sizeof long */
node = *rnode;
node.sysctl_data = &inthostid;
error = sysctl_lookup(SYSCTLFN_CALL(&node));
if (error || newp == NULL)
return (error);

hostid = (unsigned)inthostid;

return (0);
}

/*
* sysctl helper routine for kern.defcorename. In the case of a new
* string being assigned, check that it's not a zero-length string.
* (XXX the check in -current doesn't work, but do we really care?)
*/
static int
sysctl_kern_defcorename(SYSCTLFN_ARGS)
{
int error;
char *newcorename;
struct sysctlnode node;

newcorename = PNBUF_GET();
node = *rnode;
node.sysctl_data = &newcorename[0];
memcpy(node.sysctl_data, rnode->sysctl_data, MAXPATHLEN);
error = sysctl_lookup(SYSCTLFN_CALL(&node));
if (error || newp == NULL) {
goto done;
}

/*
* when sysctl_lookup() deals with a string, it's guaranteed
* to come back nul terminated. So there. :)
*/
if (strlen(newcorename) == 0) {
error = EINVAL;
} else {
memcpy(rnode->sysctl_data, node.sysctl_data, MAXPATHLEN);
error = 0;
}
done:
PNBUF_PUT(newcorename);
return error;
}

/*
* sysctl helper routine for kern.cp_time node. Adds up cpu time
* across all cpus.
*/
static int
sysctl_kern_cptime(SYSCTLFN_ARGS)
{
struct sysctlnode node = *rnode;
uint64_t *cp_time = NULL;
int error, n = ncpu, i;
struct cpu_info *ci;
CPU_INFO_ITERATOR cii;

/*
* if you specifically pass a buffer that is the size of the
* sum, or if you are probing for the size, you get the "sum"
* of cp_time (and the size thereof) across all processors.
*
* alternately, you can pass an additional mib number and get
* cp_time for that particular processor.
*/
switch (namelen) {
case 0:
if (*oldlenp == sizeof(uint64_t) * CPUSTATES || oldp == NULL) {
node.sysctl_size = sizeof(uint64_t) * CPUSTATES;
n = -1; /* SUM */
}
else {
node.sysctl_size = n * sizeof(uint64_t) * CPUSTATES;
n = -2; /* ALL */
}
break;
case 1:
if (name[0] < 0 || name[0] >= n)
return (ENOENT); /* ENOSUCHPROCESSOR */
node.sysctl_size = sizeof(uint64_t) * CPUSTATES;
n = name[0];
/*
* adjust these so that sysctl_lookup() will be happy
*/
name++;
namelen--;
break;
default:
return (EINVAL);
}

cp_time = kmem_alloc(node.sysctl_size, KM_SLEEP);
node.sysctl_data = cp_time;
memset(cp_time, 0, node.sysctl_size);

for (CPU_INFO_FOREACH(cii, ci)) {
if (n <= 0) {
for (i = 0; i < CPUSTATES; i++) {
cp_time[i] += ci->ci_schedstate.spc_cp_time[i];
}
}
/*
* if a specific processor was requested and we just
* did it, we're done here
*/
if (n == 0)
break;
/*
* if doing "all", skip to next cp_time set for next processor
*/
if (n == -2)
cp_time += CPUSTATES;
/*
* if we're doing a specific processor, we're one
* processor closer
*/
if (n > 0)
n--;
}

error = sysctl_lookup(SYSCTLFN_CALL(&node));
kmem_free(node.sysctl_data, node.sysctl_size);
return (error);
}

#if NPTY > 0
/*
* sysctl helper routine for kern.maxptys. Ensures that any new value
* is acceptable to the pty subsystem.
*/
static int
sysctl_kern_maxptys(SYSCTLFN_ARGS)
{
int pty_maxptys(int, int); /* defined in kern/tty_pty.c */
int error, xmax;
struct sysctlnode node;

/* get current value of maxptys */
xmax = pty_maxptys(0, 0);

node = *rnode;
node.sysctl_data = &xmax;
error = sysctl_lookup(SYSCTLFN_CALL(&node));
if (error || newp == NULL)
return (error);

if (xmax != pty_maxptys(xmax, 1))
return (EINVAL);

return (0);
}
#endif /* NPTY > 0 */

/*
* sysctl helper routine to do kern.lwp.* work.
*/
static int
sysctl_kern_lwp(SYSCTLFN_ARGS)
{
struct kinfo_lwp klwp;
struct proc *p;
struct lwp *l2, *l3;
char *where, *dp;
int pid, elem_size, elem_count;
int buflen, needed, error;
bool gotit;

hash_value_ensure_initialized();

if (namelen == 1 && name[0] == CTL_QUERY)
return (sysctl_query(SYSCTLFN_CALL(rnode)));

dp = where = oldp;
buflen = where != NULL ? *oldlenp : 0;
error = needed = 0;

if (newp != NULL || namelen != 3)
return (EINVAL);
pid = name[0];
elem_size = name[1];
elem_count = name[2];

sysctl_unlock();
if (pid == -1) {
mutex_enter(&proc_lock);
PROCLIST_FOREACH(p, &allproc) {
/* Grab a hold on the process. */
if (!rw_tryenter(&p->p_reflock, RW_READER)) {
continue;
}
mutex_exit(&proc_lock);

mutex_enter(p->p_lock);
LIST_FOREACH(l2, &p->p_lwps, l_sibling) {
if (buflen >= elem_size && elem_count > 0) {
lwp_lock(l2);
fill_lwp(l2, &klwp);
lwp_unlock(l2);
mutex_exit(p->p_lock);

/*
* Copy out elem_size, but not
* larger than the size of a
* struct kinfo_proc2.
*/
error = dcopyout(l, &klwp, dp,
uimin(sizeof(klwp), elem_size));
if (error) {
rw_exit(&p->p_reflock);
goto cleanup;
}
mutex_enter(p->p_lock);
LIST_FOREACH(l3, &p->p_lwps,
l_sibling) {
if (l2 == l3)
break;
}
if (l3 == NULL) {
mutex_exit(p->p_lock);
rw_exit(&p->p_reflock);
error = EAGAIN;
goto cleanup;
}
dp += elem_size;
buflen -= elem_size;
elem_count--;
}
needed += elem_size;
}
mutex_exit(p->p_lock);

/* Drop reference to process. */
mutex_enter(&proc_lock);
rw_exit(&p->p_reflock);
}
mutex_exit(&proc_lock);
} else {
mutex_enter(&proc_lock);
p = proc_find(pid);
if (p == NULL) {
error = ESRCH;
mutex_exit(&proc_lock);
goto cleanup;
}
/* Grab a hold on the process. */
gotit = rw_tryenter(&p->p_reflock, RW_READER);
mutex_exit(&proc_lock);
if (!gotit) {
error = ESRCH;
goto cleanup;
}

mutex_enter(p->p_lock);
LIST_FOREACH(l2, &p->p_lwps, l_sibling) {
if (buflen >= elem_size && elem_count > 0) {
lwp_lock(l2);
fill_lwp(l2, &klwp);
lwp_unlock(l2);
mutex_exit(p->p_lock);
/*
* Copy out elem_size, but not larger than
* the size of a struct kinfo_proc2.
*/
error = dcopyout(l, &klwp, dp,
uimin(sizeof(klwp), elem_size));
if (error) {
rw_exit(&p->p_reflock);
goto cleanup;
}
mutex_enter(p->p_lock);
LIST_FOREACH(l3, &p->p_lwps, l_sibling) {
if (l2 == l3)
break;
}
if (l3 == NULL) {
mutex_exit(p->p_lock);
rw_exit(&p->p_reflock);
error = EAGAIN;
goto cleanup;
}
dp += elem_size;
buflen -= elem_size;
elem_count--;
}
needed += elem_size;
}
mutex_exit(p->p_lock);

/* Drop reference to process. */
rw_exit(&p->p_reflock);
}

if (where != NULL) {
*oldlenp = dp - where;
if (needed > *oldlenp) {
sysctl_relock();
return (ENOMEM);
}
} else {
needed += KERN_LWPSLOP;
*oldlenp = needed;
}
error = 0;
cleanup:
sysctl_relock();
return (error);
}

/*
* sysctl helper routine for kern.forkfsleep node. Ensures that the
* given value is not too large or two small, and is at least one
* timer tick if not zero.
*/
static int
sysctl_kern_forkfsleep(SYSCTLFN_ARGS)
{
/* userland sees value in ms, internally is in ticks */
extern int forkfsleep; /* defined in kern/kern_fork.c */
int error, timo, lsleep;
struct sysctlnode node;

lsleep = forkfsleep * 1000 / hz;
node = *rnode;
node.sysctl_data = &lsleep;
error = sysctl_lookup(SYSCTLFN_CALL(&node));
if (error || newp == NULL)
return (error);

/* refuse negative values, and overly 'long time' */
if (lsleep < 0 || lsleep > MAXSLP * 1000)
return (EINVAL);

timo = mstohz(lsleep);

/* if the interval is >0 ms && <1 tick, use 1 tick */
if (lsleep != 0 && timo == 0)
forkfsleep = 1;
else
forkfsleep = timo;

return (0);
}

/*
* sysctl helper routine for kern.root_partition
*/
static int
sysctl_kern_root_partition(SYSCTLFN_ARGS)
{
int rootpart = DISKPART(rootdev);
struct sysctlnode node = *rnode;

node.sysctl_data = &rootpart;
return (sysctl_lookup(SYSCTLFN_CALL(&node)));
}

/*
* sysctl helper function for kern.drivers
*/
static int
sysctl_kern_drivers(SYSCTLFN_ARGS)
{
int error;
size_t buflen;
struct kinfo_drivers kd;
char *start, *where;
const char *dname;
int i;
extern struct devsw_conv *devsw_conv;
extern int max_devsw_convs;

start = where = oldp;
buflen = *oldlenp;
if (where == NULL) {
*oldlenp = max_devsw_convs * sizeof kd;
return 0;
}

/*
* An array of kinfo_drivers structures
*/
error = 0;
sysctl_unlock();
mutex_enter(&device_lock);
for (i = 0; i < max_devsw_convs; i++) {
dname = devsw_conv[i].d_name;
if (dname == NULL)
continue;
if (buflen < sizeof kd) {
error = ENOMEM;
break;
}
memset(&kd, 0, sizeof(kd));
kd.d_bmajor = devsw_conv[i].d_bmajor;
kd.d_cmajor = devsw_conv[i].d_cmajor;
strlcpy(kd.d_name, dname, sizeof kd.d_name);
mutex_exit(&device_lock);
error = dcopyout(l, &kd, where, sizeof kd);
mutex_enter(&device_lock);
if (error != 0)
break;
buflen -= sizeof kd;
where += sizeof kd;
}
mutex_exit(&device_lock);
sysctl_relock();
*oldlenp = where - start;
return error;
}

static int
sysctl_security_setidcore(SYSCTLFN_ARGS)
{
int newsize, error;
struct sysctlnode node;

node = *rnode;
node.sysctl_data = &newsize;
newsize = *(int *)rnode->sysctl_data;
error = sysctl_lookup(SYSCTLFN_CALL(&node));
if (error || newp == NULL)
return error;

if (kauth_authorize_system(l->l_cred, KAUTH_SYSTEM_SETIDCORE,
0, NULL, NULL, NULL))
return (EPERM);

*(int *)rnode->sysctl_data = newsize;

return 0;
}

static int
sysctl_security_setidcorename(SYSCTLFN_ARGS)
{
int error;
char *newsetidcorename;
struct sysctlnode node;

newsetidcorename = PNBUF_GET();
node = *rnode;
node.sysctl_data = newsetidcorename;
memcpy(node.sysctl_data, rnode->sysctl_data, MAXPATHLEN);
error = sysctl_lookup(SYSCTLFN_CALL(&node));
if (error || newp == NULL) {
goto out;
}
if (kauth_authorize_system(l->l_cred, KAUTH_SYSTEM_SETIDCORE,
0, NULL, NULL, NULL)) {
error = EPERM;
goto out;
}
if (strlen(newsetidcorename) == 0) {
error = EINVAL;
goto out;
}
memcpy(rnode->sysctl_data, node.sysctl_data, MAXPATHLEN);
out:
PNBUF_PUT(newsetidcorename);
return error;
}

/*
* sysctl helper routine for kern.cp_id node. Maps cpus to their
* cpuids.
*/
static int
sysctl_kern_cpid(SYSCTLFN_ARGS)
{
struct sysctlnode node = *rnode;
uint64_t *cp_id = NULL;
int error, n = ncpu;
struct cpu_info *ci;
CPU_INFO_ITERATOR cii;

/*
* Here you may either retrieve a single cpu id or the whole
* set. The size you get back when probing depends on what
* you ask for.
*/
switch (namelen) {
case 0:
node.sysctl_size = n * sizeof(uint64_t);
n = -2; /* ALL */
break;
case 1:
if (name[0] < 0 || name[0] >= n)
return (ENOENT); /* ENOSUCHPROCESSOR */
node.sysctl_size = sizeof(uint64_t);
n = name[0];
/*
* adjust these so that sysctl_lookup() will be happy
*/
name++;
namelen--;
break;
default:
return (EINVAL);
}

cp_id = kmem_alloc(node.sysctl_size, KM_SLEEP);
node.sysctl_data = cp_id;
memset(cp_id, 0, node.sysctl_size);

for (CPU_INFO_FOREACH(cii, ci)) {
if (n <= 0)
cp_id[0] = cpu_index(ci);
/*
* if a specific processor was requested and we just
* did it, we're done here
*/
if (n == 0)
break;
/*
* if doing "all", skip to next cp_id slot for next processor
*/
if (n == -2)
cp_id++;
/*
* if we're doing a specific processor, we're one
* processor closer
*/
if (n > 0)
n--;
}

error = sysctl_lookup(SYSCTLFN_CALL(&node));
kmem_free(node.sysctl_data, node.sysctl_size);
return (error);
}

/*
* sysctl helper routine for hw.usermem and hw.usermem64. Values are
* calculate on the fly taking into account integer overflow and the
* current wired count.
*/
static int
sysctl_hw_usermem(SYSCTLFN_ARGS)
{
u_int ui;
u_quad_t uq;
struct sysctlnode node;

node = *rnode;
switch (rnode->sysctl_num) {
case HW_USERMEM:
if ((ui = physmem - uvmexp.wired) > (UINT_MAX / PAGE_SIZE))
ui = UINT_MAX;
else
ui *= PAGE_SIZE;
node.sysctl_data = &ui;
break;
case HW_USERMEM64:
uq = (u_quad_t)(physmem - uvmexp.wired) * PAGE_SIZE;
node.sysctl_data = &uq;
break;
default:
return (EINVAL);
}

return (sysctl_lookup(SYSCTLFN_CALL(&node)));
}

/*
* sysctl helper routine for kern.cnmagic node. Pulls the old value
* out, encoded, and stuffs the new value in for decoding.
*/
static int
sysctl_hw_cnmagic(SYSCTLFN_ARGS)
{
char magic[CNS_LEN];
int error;
struct sysctlnode node;

if (oldp)
cn_get_magic(magic, CNS_LEN);
node = *rnode;
node.sysctl_data = &magic[0];
error = sysctl_lookup(SYSCTLFN_CALL(&node));
if (error || newp == NULL)
return (error);

return (cn_set_magic(magic));
}

/*
* ********************************************************************
* section 3: public helper routines that are used for more than one
* node
* ********************************************************************
*/

/*
* sysctl helper routine for the kern.root_device node and some ports'
* machdep.root_device nodes.
*/
int
sysctl_root_device(SYSCTLFN_ARGS)
{
struct sysctlnode node;

node = *rnode;
node.sysctl_data = __UNCONST(device_xname(root_device));
node.sysctl_size = strlen(device_xname(root_device)) + 1;
return (sysctl_lookup(SYSCTLFN_CALL(&node)));
}

/*
* sysctl helper routine for kern.consdev, dependent on the current
* state of the console. Also used for machdep.console_device on some
* ports.
*/
int
sysctl_consdev(SYSCTLFN_ARGS)
{
dev_t consdev;
uint32_t oconsdev;
struct sysctlnode node;

if (cn_tab != NULL)
consdev = cn_tab->cn_dev;
else
consdev = NODEV;
node = *rnode;
switch (*oldlenp) {
case sizeof(consdev):
node.sysctl_data = &consdev;
node.sysctl_size = sizeof(consdev);
break;
case sizeof(oconsdev):
oconsdev = (uint32_t)consdev;
node.sysctl_data = &oconsdev;
node.sysctl_size = sizeof(oconsdev);
break;
default:
return EINVAL;
}
return (sysctl_lookup(SYSCTLFN_CALL(&node)));
}

/*
* ********************************************************************
* section 4: support for some helpers
* ********************************************************************
*/

/*
* Fill in a kinfo_lwp structure for the specified lwp.
*/
static void
fill_lwp(struct lwp *l, struct kinfo_lwp *kl)
{
const bool allowaddr = get_expose_address(curproc);
struct proc *p = l->l_proc;
struct timeval tv;

KASSERT(lwp_locked(l, NULL));

memset(kl, 0, sizeof(*kl));

kl->l_forw = 0;
kl->l_back = 0;
COND_SET_VALUE(kl->l_laddr, PTRTOUINT64(l), allowaddr);
COND_SET_VALUE(kl->l_addr, PTRTOUINT64(l->l_addr), allowaddr);
kl->l_stat = l->l_stat;
kl->l_lid = l->l_lid;
kl->l_flag = L_INMEM;
kl->l_flag |= sysctl_map_flags(sysctl_lwpprflagmap, l->l_prflag);
kl->l_flag |= sysctl_map_flags(sysctl_lwpflagmap, l->l_flag);

kl->l_swtime = l->l_swtime;
kl->l_slptime = l->l_slptime;
if (l->l_stat == LSONPROC)
kl->l_schedflags = l->l_cpu->ci_schedstate.spc_flags;
else
kl->l_schedflags = 0;
kl->l_priority = lwp_eprio(l);
kl->l_usrpri = l->l_priority;
if (l->l_wchan)
strncpy(kl->l_wmesg, l->l_wmesg, sizeof(kl->l_wmesg));
COND_SET_VALUE(kl->l_wchan, PTRTOUINT64(l->l_wchan), allowaddr);
kl->l_cpuid = cpu_index(l->l_cpu);
bintime2timeval(&l->l_rtime, &tv);
kl->l_rtime_sec = tv.tv_sec;
kl->l_rtime_usec = tv.tv_usec;
kl->l_cpticks = l->l_cpticks;
kl->l_pctcpu = l->l_pctcpu;
kl->l_pid = p->p_pid;
if (l->l_name == NULL)
kl->l_name[0] = '\0';
else
strlcpy(kl->l_name, l->l_name, sizeof(kl->l_name));
}