xref: /freebsd-11.0-release/sys/compat/svr4/svr4_resource.c

/*-
 * Copyright (c) 1998 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by Christos Zoulas.
 *
 * 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.
 */
/*-
 * Portions of this software have been derived from software contributed
 * to the FreeBSD Project by Mark Newton.
 *
 * Copyright (c) 1999 Mark Newton
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 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.
 *
 * Derived from: $NetBSD: svr4_resource.c,v 1.3 1998/12/13 18:00:52 christos Exp $
 */

#include <sys/cdefs.h>
__FBSDID("$FreeBSD: releng/11.0/sys/compat/svr4/svr4_resource.c 284215 2015-06-10 10:48:12Z mjg $");

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/file.h>
#include <sys/lock.h>
#include <sys/mutex.h>
#include <sys/proc.h>
#include <sys/resource.h>
#include <sys/resourcevar.h>
#include <sys/syscallsubr.h>

#include <compat/svr4/svr4.h>
#include <compat/svr4/svr4_types.h>
#include <compat/svr4/svr4_resource.h>
#include <compat/svr4/svr4_signal.h>
#include <compat/svr4/svr4_proto.h>
#include <compat/svr4/svr4_util.h>

static __inline int svr4_to_native_rl(int);

static __inline int
svr4_to_native_rl(rl)
	int rl;
{
	switch (rl) {
	case SVR4_RLIMIT_CPU:
		return RLIMIT_CPU;
	case SVR4_RLIMIT_FSIZE:
		return RLIMIT_FSIZE;
	case SVR4_RLIMIT_DATA:
		return RLIMIT_DATA;
	case SVR4_RLIMIT_STACK:
		return RLIMIT_STACK;
	case SVR4_RLIMIT_CORE:
		return RLIMIT_CORE;
	case SVR4_RLIMIT_NOFILE:
		return RLIMIT_NOFILE;
	case SVR4_RLIMIT_VMEM:
		return RLIMIT_VMEM;
	default:
		return -1;
	}
}

/*
 * Check if the resource limit fits within the BSD range and it is not
 * one of the magic SVR4 limit values
 */
#define OKLIMIT(l) (((int32_t)(l)) >= 0 && ((int32_t)(l)) < 0x7fffffff && \
	((svr4_rlim_t)(l)) != SVR4_RLIM_INFINITY && \
	((svr4_rlim_t)(l)) != SVR4_RLIM_SAVED_CUR && \
	((svr4_rlim_t)(l)) != SVR4_RLIM_SAVED_MAX)

#define OKLIMIT64(l) (((rlim_t)(l)) >= 0 && ((rlim_t)(l)) < RLIM_INFINITY && \
	((svr4_rlim64_t)(l)) != SVR4_RLIM64_INFINITY && \
	((svr4_rlim64_t)(l)) != SVR4_RLIM64_SAVED_CUR && \
	((svr4_rlim64_t)(l)) != SVR4_RLIM64_SAVED_MAX)

int
svr4_sys_getrlimit(td, uap)
	struct thread *td;
	struct svr4_sys_getrlimit_args *uap;
{
	int rl = svr4_to_native_rl(uap->which);
	struct rlimit blim;
	struct svr4_rlimit slim;

	if (rl == -1)
		return EINVAL;

	lim_rlimit(td, rl, &blim);

	/*
	 * Our infinity, is their maxfiles.
	 */
	if (rl == RLIMIT_NOFILE && blim.rlim_max == RLIM_INFINITY)
		blim.rlim_max = maxfiles;

	/*
	 * If the limit can be be represented, it is returned.
	 * Otherwise, if rlim_cur == rlim_max, return RLIM_SAVED_MAX
	 * else return RLIM_SAVED_CUR
	 */
	if (blim.rlim_max == RLIM_INFINITY)
		slim.rlim_max = SVR4_RLIM_INFINITY;
	else if (OKLIMIT(blim.rlim_max))
		slim.rlim_max = (svr4_rlim_t) blim.rlim_max;
	else
		slim.rlim_max = SVR4_RLIM_SAVED_MAX;

	if (blim.rlim_cur == RLIM_INFINITY)
		slim.rlim_cur = SVR4_RLIM_INFINITY;
	else if (OKLIMIT(blim.rlim_cur))
		slim.rlim_cur = (svr4_rlim_t) blim.rlim_cur;
	else if (blim.rlim_max == blim.rlim_cur)
		slim.rlim_cur = SVR4_RLIM_SAVED_MAX;
	else
		slim.rlim_cur = SVR4_RLIM_SAVED_CUR;

	return copyout(&slim, uap->rlp, sizeof(*uap->rlp));
}


int
svr4_sys_setrlimit(td, uap)
	struct thread *td;
	struct svr4_sys_setrlimit_args *uap;
{
	int rl = svr4_to_native_rl(uap->which);
	struct rlimit blim, curlim;
	struct svr4_rlimit slim;
	int error;

	if (rl == -1)
		return EINVAL;

	if ((error = copyin(uap->rlp, &slim, sizeof(slim))) != 0)
		return error;

	lim_rlimit(td, rl, &curlim);

	/*
	 * if the limit is SVR4_RLIM_INFINITY, then we set it to our
	 * unlimited.
	 * We should also: If it is SVR4_RLIM_SAVED_MAX, we should set the
	 * new limit to the corresponding saved hard limit, and if
	 * it is equal to SVR4_RLIM_SAVED_CUR, we should set it to the
	 * corresponding saved soft limit.
	 *
	 */
	if (slim.rlim_max == SVR4_RLIM_INFINITY)
		blim.rlim_max = RLIM_INFINITY;
	else if (OKLIMIT(slim.rlim_max))
		blim.rlim_max = (rlim_t) slim.rlim_max;
	else if (slim.rlim_max == SVR4_RLIM_SAVED_MAX)
		blim.rlim_max = curlim.rlim_max;
	else if (slim.rlim_max == SVR4_RLIM_SAVED_CUR)
		blim.rlim_max = curlim.rlim_cur;

	if (slim.rlim_cur == SVR4_RLIM_INFINITY)
		blim.rlim_cur = RLIM_INFINITY;
	else if (OKLIMIT(slim.rlim_cur))
		blim.rlim_cur = (rlim_t) slim.rlim_cur;
	else if (slim.rlim_cur == SVR4_RLIM_SAVED_MAX)
		blim.rlim_cur = curlim.rlim_max;
	else if (slim.rlim_cur == SVR4_RLIM_SAVED_CUR)
		blim.rlim_cur = curlim.rlim_cur;

	return (kern_setrlimit(td, rl, &blim));
}


int
svr4_sys_getrlimit64(td, uap)
	struct thread *td;
	struct svr4_sys_getrlimit64_args *uap;
{
	int rl = svr4_to_native_rl(uap->which);
	struct rlimit blim;
	struct svr4_rlimit64 slim;

	if (rl == -1)
		return EINVAL;

	lim_rlimit(td, rl, &blim);

	/*
	 * Our infinity, is their maxfiles.
	 */
	if (rl == RLIMIT_NOFILE && blim.rlim_max == RLIM_INFINITY)
		blim.rlim_max = maxfiles;

	/*
	 * If the limit can be be represented, it is returned.
	 * Otherwise, if rlim_cur == rlim_max, return SVR4_RLIM_SAVED_MAX
	 * else return SVR4_RLIM_SAVED_CUR
	 */
	if (blim.rlim_max == RLIM_INFINITY)
		slim.rlim_max = SVR4_RLIM64_INFINITY;
	else if (OKLIMIT64(blim.rlim_max))
		slim.rlim_max = (svr4_rlim64_t) blim.rlim_max;
	else
		slim.rlim_max = SVR4_RLIM64_SAVED_MAX;

	if (blim.rlim_cur == RLIM_INFINITY)
		slim.rlim_cur = SVR4_RLIM64_INFINITY;
	else if (OKLIMIT64(blim.rlim_cur))
		slim.rlim_cur = (svr4_rlim64_t) blim.rlim_cur;
	else if (blim.rlim_max == blim.rlim_cur)
		slim.rlim_cur = SVR4_RLIM64_SAVED_MAX;
	else
		slim.rlim_cur = SVR4_RLIM64_SAVED_CUR;

	return copyout(&slim, uap->rlp, sizeof(*uap->rlp));
}


int
svr4_sys_setrlimit64(td, uap)
	struct thread *td;
	struct svr4_sys_setrlimit64_args *uap;
{
	int rl = svr4_to_native_rl(uap->which);
	struct rlimit blim, curlim;
	struct svr4_rlimit64 slim;
	int error;

	if (rl == -1)
		return EINVAL;

	if ((error = copyin(uap->rlp, &slim, sizeof(slim))) != 0)
		return error;

	lim_rlimit(td, rl, &curlim);

	/*
	 * if the limit is SVR4_RLIM64_INFINITY, then we set it to our
	 * unlimited.
	 * We should also: If it is SVR4_RLIM64_SAVED_MAX, we should set the
	 * new limit to the corresponding saved hard limit, and if
	 * it is equal to SVR4_RLIM64_SAVED_CUR, we should set it to the
	 * corresponding saved soft limit.
	 *
	 */
	if (slim.rlim_max == SVR4_RLIM64_INFINITY)
		blim.rlim_max = RLIM_INFINITY;
	else if (OKLIMIT64(slim.rlim_max))
		blim.rlim_max = (rlim_t) slim.rlim_max;
	else if (slim.rlim_max == SVR4_RLIM64_SAVED_MAX)
		blim.rlim_max = curlim.rlim_max;
	else if (slim.rlim_max == SVR4_RLIM64_SAVED_CUR)
		blim.rlim_max = curlim.rlim_cur;

	if (slim.rlim_cur == SVR4_RLIM64_INFINITY)
		blim.rlim_cur = RLIM_INFINITY;
	else if (OKLIMIT64(slim.rlim_cur))
		blim.rlim_cur = (rlim_t) slim.rlim_cur;
	else if (slim.rlim_cur == SVR4_RLIM64_SAVED_MAX)
		blim.rlim_cur = curlim.rlim_max;
	else if (slim.rlim_cur == SVR4_RLIM64_SAVED_CUR)
		blim.rlim_cur = curlim.rlim_cur;

	return (kern_setrlimit(td, rl, &blim));
}