config root man

/*-
 * Copyright (c) 2001 Jake Burkholder.
 * 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.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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.
 *
 * $FreeBSD: release/9.1.0/sys/sparc64/sparc64/sys_machdep.c 223692 2011-06-30 10:56:02Z jonathan $
 */

#include "opt_capsicum.h"

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/capability.h>
#include <sys/lock.h>
#include <sys/malloc.h>
#include <sys/mutex.h>
#include <sys/proc.h>
#include <sys/sysproto.h>

#include <machine/md_var.h>
#include <machine/utrap.h>
#include <machine/sysarch.h>

static int sparc_sigtramp_install(struct thread *td, char *args);
static int sparc_utrap_install(struct thread *td, char *args);

#ifndef	_SYS_SYSPROTO_H_
struct sysarch_args {
	int	op;
	char	*parms;
};
#endif

int
sysarch(struct thread *td, struct sysarch_args *uap)
{
	int error;

#ifdef CAPABILITY_MODE
	/*
	 * When adding new operations, add a new case statement here to
	 * explicitly indicate whether or not the operation is safe to
	 * perform in capability mode.
	 */
	if (IN_CAPABILITY_MODE(td)) {
		switch (uap->op) {
		case SPARC_SIGTRAMP_INSTALL:
		case SPARC_UTRAP_INSTALL:
			break;

		default:
			return (ECAPMODE);
		}
	}
#endif

	mtx_lock(&Giant);
	switch (uap->op) {
	case SPARC_SIGTRAMP_INSTALL:
		error = sparc_sigtramp_install(td, uap->parms);
		break;
	case SPARC_UTRAP_INSTALL:
		error = sparc_utrap_install(td, uap->parms);
		break;
	default:
		error = EINVAL;
		break;
	}
	mtx_unlock(&Giant);
	return (error);
}

static int
sparc_sigtramp_install(struct thread *td, char *args)
{
	struct sparc_sigtramp_install_args sia;
	struct proc *p;
	int error;

	p = td->td_proc;
	if ((error = copyin(args, &sia, sizeof(sia))) != 0)
		return (error);
	if (sia.sia_old != NULL) {
		if (suword(sia.sia_old, (long)p->p_md.md_sigtramp) != 0)
			return (EFAULT);
	}
	p->p_md.md_sigtramp = sia.sia_new;
	return (0);
}

static int
sparc_utrap_install(struct thread *td, char *args)
{
	struct sparc_utrap_install_args uia;
	struct sparc_utrap_args ua;
	struct md_utrap *ut;
	int error;
	int i;

	ut = td->td_proc->p_md.md_utrap;
	if ((error = copyin(args, &uia, sizeof(uia))) != 0)
		return (error);
	if (uia.num < 0 || uia.num > UT_MAX ||
	    (uia.handlers == NULL && uia.num > 0))
		return (EINVAL);
	for (i = 0; i < uia.num; i++) {
		if ((error = copyin(&uia.handlers[i], &ua, sizeof(ua))) != 0)
			return (error);
		if (ua.type != UTH_NOCHANGE &&
		    (ua.type < 0 || ua.type >= UT_MAX))
			return (EINVAL);
		if (ua.old_deferred != NULL) {
			if ((error = suword(ua.old_deferred, 0)) != 0)
				return (error);
		}
		if (ua.old_precise != NULL) {
			error = suword(ua.old_precise,
			    ut != NULL ? (long)ut->ut_precise[ua.type] : 0);
			if (error != 0)
				return (error);
		}
		if (ua.type != UTH_NOCHANGE) {
			if (ut == NULL) {
				ut = utrap_alloc();
				td->td_proc->p_md.md_utrap = ut;
			}
			ut->ut_precise[ua.type] = ua.new_precise;
		}
	}
	return (0);
}