c8660b50b6
via sysctl(8). The initial value of maxprocperuid is maxproc-1, that of maxfilesperproc is maxfiles (untill maxfile will disappear) Now it is at least possible to prohibit one user opening maxfiles -Guido Submitted by: Obtained from:
570 lines
13 KiB
C
570 lines
13 KiB
C
/*-
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* Copyright (c) 1982, 1986, 1991, 1993
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* The Regents of the University of California. All rights reserved.
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* (c) UNIX System Laboratories, Inc.
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* All or some portions of this file are derived from material licensed
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* to the University of California by American Telephone and Telegraph
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* Co. or Unix System Laboratories, Inc. and are reproduced herein with
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* the permission of UNIX System Laboratories, Inc.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)kern_resource.c 8.5 (Berkeley) 1/21/94
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* $Id: kern_resource.c,v 1.10 1994/12/06 22:53:37 bde Exp $
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*/
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/kernel.h>
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#include <sys/file.h>
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#include <sys/resourcevar.h>
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#include <sys/malloc.h>
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#include <sys/proc.h>
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#include <vm/vm.h>
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int donice __P((struct proc *, struct proc *, int));
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int dosetrlimit __P((struct proc *, u_int, struct rlimit *));
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/*
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* Resource controls and accounting.
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*/
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struct getpriority_args {
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int which;
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int who;
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};
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int
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getpriority(curp, uap, retval)
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struct proc *curp;
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register struct getpriority_args *uap;
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int *retval;
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{
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register struct proc *p;
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register int low = PRIO_MAX + 1;
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switch (uap->which) {
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case PRIO_PROCESS:
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if (uap->who == 0)
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p = curp;
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else
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p = pfind(uap->who);
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if (p == 0)
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break;
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low = p->p_nice;
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break;
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case PRIO_PGRP: {
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register struct pgrp *pg;
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if (uap->who == 0)
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pg = curp->p_pgrp;
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else if ((pg = pgfind(uap->who)) == NULL)
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break;
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for (p = pg->pg_mem; p != NULL; p = p->p_pgrpnxt) {
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if (p->p_nice < low)
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low = p->p_nice;
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}
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break;
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}
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case PRIO_USER:
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if (uap->who == 0)
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uap->who = curp->p_ucred->cr_uid;
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for (p = (struct proc *)allproc; p != NULL; p = p->p_next) {
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if (p->p_ucred->cr_uid == uap->who &&
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p->p_nice < low)
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low = p->p_nice;
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}
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break;
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default:
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return (EINVAL);
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}
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if (low == PRIO_MAX + 1)
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return (ESRCH);
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*retval = low;
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return (0);
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}
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struct setpriority_args {
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int which;
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int who;
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int prio;
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};
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/* ARGSUSED */
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int
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setpriority(curp, uap, retval)
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struct proc *curp;
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register struct setpriority_args *uap;
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int *retval;
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{
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register struct proc *p;
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int found = 0, error = 0;
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switch (uap->which) {
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case PRIO_PROCESS:
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if (uap->who == 0)
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p = curp;
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else
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p = pfind(uap->who);
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if (p == 0)
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break;
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error = donice(curp, p, uap->prio);
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found++;
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break;
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case PRIO_PGRP: {
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register struct pgrp *pg;
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if (uap->who == 0)
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pg = curp->p_pgrp;
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else if ((pg = pgfind(uap->who)) == NULL)
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break;
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for (p = pg->pg_mem; p != NULL; p = p->p_pgrpnxt) {
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error = donice(curp, p, uap->prio);
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found++;
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}
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break;
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}
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case PRIO_USER:
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if (uap->who == 0)
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uap->who = curp->p_ucred->cr_uid;
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for (p = (struct proc *)allproc; p != NULL; p = p->p_next)
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if (p->p_ucred->cr_uid == uap->who) {
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error = donice(curp, p, uap->prio);
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found++;
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}
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break;
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default:
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return (EINVAL);
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}
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if (found == 0)
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return (ESRCH);
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return (error);
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}
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int
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donice(curp, chgp, n)
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register struct proc *curp, *chgp;
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register int n;
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{
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register struct pcred *pcred = curp->p_cred;
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if (pcred->pc_ucred->cr_uid && pcred->p_ruid &&
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pcred->pc_ucred->cr_uid != chgp->p_ucred->cr_uid &&
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pcred->p_ruid != chgp->p_ucred->cr_uid)
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return (EPERM);
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if (n > PRIO_MAX)
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n = PRIO_MAX;
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if (n < PRIO_MIN)
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n = PRIO_MIN;
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if (n < chgp->p_nice && suser(pcred->pc_ucred, &curp->p_acflag))
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return (EACCES);
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chgp->p_nice = n;
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(void)resetpriority(chgp);
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return (0);
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}
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/* rtprio system call */
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struct rtprio_args {
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int function;
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pid_t pid;
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struct rtprio *rtprio;
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};
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/*
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* Set realtime priority
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*/
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/* ARGSUSED */
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int
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rtprio(curp, uap, retval)
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struct proc *curp;
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register struct rtprio_args *uap;
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int *retval;
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{
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register struct proc *p;
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register struct pcred *pcred = curp->p_cred;
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struct rtprio rtp;
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int error;
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error = copyin(uap->rtprio, &rtp, sizeof(struct rtprio));
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if (error)
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return (error);
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if (uap->pid == 0)
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p = curp;
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else
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p = pfind(uap->pid);
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if (p == 0)
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return (ESRCH);
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switch (uap->function) {
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case RTP_LOOKUP:
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return (copyout(&p->p_rtprio, uap->rtprio, sizeof(struct rtprio)));
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case RTP_SET:
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if (pcred->pc_ucred->cr_uid && pcred->p_ruid &&
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pcred->pc_ucred->cr_uid != p->p_ucred->cr_uid &&
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pcred->p_ruid != p->p_ucred->cr_uid)
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return (EPERM);
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/* disallow setting rtprio in most cases if not superuser */
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if (suser(pcred->pc_ucred, &curp->p_acflag)) {
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/* can't set someone else's */
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if (uap->pid)
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return (EPERM);
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/* can't set realtime priority */
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if (rtp.type == RTP_PRIO_REALTIME)
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return (EPERM);
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}
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switch (rtp.type) {
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case RTP_PRIO_REALTIME:
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case RTP_PRIO_NORMAL:
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case RTP_PRIO_IDLE:
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if (rtp.prio > RTP_PRIO_MAX)
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return (EINVAL);
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p->p_rtprio = rtp;
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return (0);
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default:
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return (EINVAL);
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}
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default:
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return (EINVAL);
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}
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}
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#if defined(COMPAT_43) || defined(COMPAT_SUNOS)
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struct setrlimit_args {
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u_int which;
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struct orlimit *lim;
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};
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/* ARGSUSED */
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int
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osetrlimit(p, uap, retval)
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struct proc *p;
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register struct setrlimit_args *uap;
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int *retval;
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{
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struct orlimit olim;
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struct rlimit lim;
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int error;
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if ((error =
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copyin((caddr_t)uap->lim, (caddr_t)&olim, sizeof(struct orlimit))))
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return (error);
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lim.rlim_cur = olim.rlim_cur;
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lim.rlim_max = olim.rlim_max;
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return (dosetrlimit(p, uap->which, &lim));
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}
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struct getrlimit_args {
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u_int which;
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struct orlimit *rlp;
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};
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/* ARGSUSED */
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int
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ogetrlimit(p, uap, retval)
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struct proc *p;
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register struct getrlimit_args *uap;
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int *retval;
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{
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struct orlimit olim;
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if (uap->which >= RLIM_NLIMITS)
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return (EINVAL);
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olim.rlim_cur = p->p_rlimit[uap->which].rlim_cur;
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if (olim.rlim_cur == -1)
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olim.rlim_cur = 0x7fffffff;
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olim.rlim_max = p->p_rlimit[uap->which].rlim_max;
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if (olim.rlim_max == -1)
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olim.rlim_max = 0x7fffffff;
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return (copyout((caddr_t)&olim, (caddr_t)uap->rlp, sizeof(olim)));
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}
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#endif /* COMPAT_43 || COMPAT_SUNOS */
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struct __setrlimit_args {
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u_int which;
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struct rlimit *lim;
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};
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/* ARGSUSED */
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int
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setrlimit(p, uap, retval)
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struct proc *p;
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register struct __setrlimit_args *uap;
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int *retval;
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{
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struct rlimit alim;
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int error;
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if ((error =
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copyin((caddr_t)uap->lim, (caddr_t)&alim, sizeof (struct rlimit))))
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return (error);
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return (dosetrlimit(p, uap->which, &alim));
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}
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int
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dosetrlimit(p, which, limp)
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struct proc *p;
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u_int which;
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struct rlimit *limp;
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{
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register struct rlimit *alimp;
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int error;
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if (which >= RLIM_NLIMITS)
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return (EINVAL);
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alimp = &p->p_rlimit[which];
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/*
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* Preserve historical bugs by treating negative limits as unsigned.
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*/
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if (limp->rlim_cur < 0)
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limp->rlim_cur = RLIM_INFINITY;
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if (limp->rlim_max < 0)
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limp->rlim_max = RLIM_INFINITY;
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if (limp->rlim_cur > alimp->rlim_max ||
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limp->rlim_max > alimp->rlim_max)
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if ((error = suser(p->p_ucred, &p->p_acflag)))
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return (error);
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if (limp->rlim_cur > limp->rlim_max)
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limp->rlim_cur = limp->rlim_max;
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if (p->p_limit->p_refcnt > 1 &&
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(p->p_limit->p_lflags & PL_SHAREMOD) == 0) {
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p->p_limit->p_refcnt--;
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p->p_limit = limcopy(p->p_limit);
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alimp = &p->p_rlimit[which];
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}
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switch (which) {
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case RLIMIT_DATA:
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if (limp->rlim_cur > MAXDSIZ)
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limp->rlim_cur = MAXDSIZ;
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if (limp->rlim_max > MAXDSIZ)
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limp->rlim_max = MAXDSIZ;
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break;
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case RLIMIT_STACK:
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if (limp->rlim_cur > MAXSSIZ)
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limp->rlim_cur = MAXSSIZ;
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if (limp->rlim_max > MAXSSIZ)
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limp->rlim_max = MAXSSIZ;
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/*
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* Stack is allocated to the max at exec time with only
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* "rlim_cur" bytes accessible. If stack limit is going
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* up make more accessible, if going down make inaccessible.
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*/
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if (limp->rlim_cur != alimp->rlim_cur) {
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vm_offset_t addr;
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vm_size_t size;
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vm_prot_t prot;
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if (limp->rlim_cur > alimp->rlim_cur) {
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prot = VM_PROT_ALL;
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size = limp->rlim_cur - alimp->rlim_cur;
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addr = USRSTACK - limp->rlim_cur;
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} else {
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prot = VM_PROT_NONE;
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size = alimp->rlim_cur - limp->rlim_cur;
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addr = USRSTACK - alimp->rlim_cur;
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}
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addr = trunc_page(addr);
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size = round_page(size);
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(void) vm_map_protect(&p->p_vmspace->vm_map,
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addr, addr+size, prot, FALSE);
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}
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break;
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case RLIMIT_NOFILE:
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if (limp->rlim_cur > maxfilesperproc)
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limp->rlim_cur = maxfilesperproc;
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if (limp->rlim_max > maxfilesperproc)
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limp->rlim_max = maxfilesperproc;
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break;
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case RLIMIT_NPROC:
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if (limp->rlim_cur > maxprocperuid)
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limp->rlim_cur = maxprocperuid;
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if (limp->rlim_max > maxprocperuid)
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limp->rlim_max = maxprocperuid;
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break;
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}
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*alimp = *limp;
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return (0);
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}
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struct __getrlimit_args {
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u_int which;
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struct rlimit *rlp;
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};
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/* ARGSUSED */
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int
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getrlimit(p, uap, retval)
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struct proc *p;
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register struct __getrlimit_args *uap;
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int *retval;
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{
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if (uap->which >= RLIM_NLIMITS)
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return (EINVAL);
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return (copyout((caddr_t)&p->p_rlimit[uap->which], (caddr_t)uap->rlp,
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sizeof (struct rlimit)));
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}
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/*
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* Transform the running time and tick information in proc p into user,
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* system, and interrupt time usage.
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*/
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void
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calcru(p, up, sp, ip)
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register struct proc *p;
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register struct timeval *up;
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register struct timeval *sp;
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register struct timeval *ip;
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{
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register u_quad_t u, st, ut, it, tot;
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register u_long sec, usec;
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register int s;
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struct timeval tv;
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s = splstatclock();
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st = p->p_sticks;
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ut = p->p_uticks;
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it = p->p_iticks;
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splx(s);
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tot = st + ut + it;
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if (tot == 0) {
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up->tv_sec = up->tv_usec = 0;
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sp->tv_sec = sp->tv_usec = 0;
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if (ip != NULL)
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ip->tv_sec = ip->tv_usec = 0;
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return;
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}
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sec = p->p_rtime.tv_sec;
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usec = p->p_rtime.tv_usec;
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if (p == curproc) {
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/*
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* Adjust for the current time slice. This is actually fairly
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* important since the error here is on the order of a time
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* quantum, which is much greater than the sampling error.
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*/
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microtime(&tv);
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sec += tv.tv_sec - runtime.tv_sec;
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usec += tv.tv_usec - runtime.tv_usec;
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}
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u = sec * 1000000 + usec;
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st = (u * st) / tot;
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sp->tv_sec = st / 1000000;
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sp->tv_usec = st % 1000000;
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ut = (u * ut) / tot;
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up->tv_sec = ut / 1000000;
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up->tv_usec = ut % 1000000;
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if (ip != NULL) {
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it = (u * it) / tot;
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ip->tv_sec = it / 1000000;
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ip->tv_usec = it % 1000000;
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}
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}
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struct getrusage_args {
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int who;
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struct rusage *rusage;
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};
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/* ARGSUSED */
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int
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getrusage(p, uap, retval)
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register struct proc *p;
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register struct getrusage_args *uap;
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int *retval;
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{
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register struct rusage *rup;
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switch (uap->who) {
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case RUSAGE_SELF:
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rup = &p->p_stats->p_ru;
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calcru(p, &rup->ru_utime, &rup->ru_stime, NULL);
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break;
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case RUSAGE_CHILDREN:
|
|
rup = &p->p_stats->p_cru;
|
|
break;
|
|
|
|
default:
|
|
return (EINVAL);
|
|
}
|
|
return (copyout((caddr_t)rup, (caddr_t)uap->rusage,
|
|
sizeof (struct rusage)));
|
|
}
|
|
|
|
void
|
|
ruadd(ru, ru2)
|
|
register struct rusage *ru, *ru2;
|
|
{
|
|
register long *ip, *ip2;
|
|
register int i;
|
|
|
|
timevaladd(&ru->ru_utime, &ru2->ru_utime);
|
|
timevaladd(&ru->ru_stime, &ru2->ru_stime);
|
|
if (ru->ru_maxrss < ru2->ru_maxrss)
|
|
ru->ru_maxrss = ru2->ru_maxrss;
|
|
ip = &ru->ru_first; ip2 = &ru2->ru_first;
|
|
for (i = &ru->ru_last - &ru->ru_first; i >= 0; i--)
|
|
*ip++ += *ip2++;
|
|
}
|
|
|
|
/*
|
|
* Make a copy of the plimit structure.
|
|
* We share these structures copy-on-write after fork,
|
|
* and copy when a limit is changed.
|
|
*/
|
|
struct plimit *
|
|
limcopy(lim)
|
|
struct plimit *lim;
|
|
{
|
|
register struct plimit *copy;
|
|
|
|
MALLOC(copy, struct plimit *, sizeof(struct plimit),
|
|
M_SUBPROC, M_WAITOK);
|
|
bcopy(lim->pl_rlimit, copy->pl_rlimit,
|
|
sizeof(struct rlimit) * RLIM_NLIMITS);
|
|
copy->p_lflags = 0;
|
|
copy->p_refcnt = 1;
|
|
return (copy);
|
|
}
|