/*- * Copyright (c) 1982, 1986, 1991, 1993 * The Regents of the University of California. All rights reserved. * (c) UNIX System Laboratories, Inc. * All or some portions of this file are derived from material licensed * to the University of California by American Telephone and Telegraph * Co. or Unix System Laboratories, Inc. and are reproduced herein with * the permission of UNIX System Laboratories, Inc. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by the University of * California, Berkeley and its contributors. * 4. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * @(#)kern_resource.c 8.5 (Berkeley) 1/21/94 * $Id: kern_resource.c,v 1.31 1998/02/04 18:43:10 dg Exp $ */ #include "opt_compat.h" #include "opt_rlimit.h" #include #include #include #include #include #include #include #include #include #include #include #include #include #include static int donice __P((struct proc *curp, struct proc *chgp, int n)); static int dosetrlimit __P((struct proc *p, u_int which, struct rlimit *limp)); /* * Resource controls and accounting. */ #ifndef _SYS_SYSPROTO_H_ struct getpriority_args { int which; int who; }; #endif int getpriority(curp, uap) struct proc *curp; register struct getpriority_args *uap; { register struct proc *p; register int low = PRIO_MAX + 1; switch (uap->which) { case PRIO_PROCESS: if (uap->who == 0) p = curp; else p = pfind(uap->who); if (p == 0) break; low = p->p_nice; break; case PRIO_PGRP: { register struct pgrp *pg; if (uap->who == 0) pg = curp->p_pgrp; else if ((pg = pgfind(uap->who)) == NULL) break; for (p = pg->pg_members.lh_first; p != 0; p = p->p_pglist.le_next) { if (p->p_nice < low) low = p->p_nice; } break; } case PRIO_USER: if (uap->who == 0) uap->who = curp->p_ucred->cr_uid; for (p = allproc.lh_first; p != 0; p = p->p_list.le_next) if (p->p_ucred->cr_uid == uap->who && p->p_nice < low) low = p->p_nice; break; default: return (EINVAL); } if (low == PRIO_MAX + 1) return (ESRCH); curp->p_retval[0] = low; return (0); } #ifndef _SYS_SYSPROTO_H_ struct setpriority_args { int which; int who; int prio; }; #endif /* ARGSUSED */ int setpriority(curp, uap) struct proc *curp; register struct setpriority_args *uap; { register struct proc *p; int found = 0, error = 0; switch (uap->which) { case PRIO_PROCESS: if (uap->who == 0) p = curp; else p = pfind(uap->who); if (p == 0) break; error = donice(curp, p, uap->prio); found++; break; case PRIO_PGRP: { register struct pgrp *pg; if (uap->who == 0) pg = curp->p_pgrp; else if ((pg = pgfind(uap->who)) == NULL) break; for (p = pg->pg_members.lh_first; p != 0; p = p->p_pglist.le_next) { error = donice(curp, p, uap->prio); found++; } break; } case PRIO_USER: if (uap->who == 0) uap->who = curp->p_ucred->cr_uid; for (p = allproc.lh_first; p != 0; p = p->p_list.le_next) if (p->p_ucred->cr_uid == uap->who) { error = donice(curp, p, uap->prio); found++; } break; default: return (EINVAL); } if (found == 0) return (ESRCH); return (error); } static int donice(curp, chgp, n) register struct proc *curp, *chgp; register int n; { register struct pcred *pcred = curp->p_cred; if (pcred->pc_ucred->cr_uid && pcred->p_ruid && pcred->pc_ucred->cr_uid != chgp->p_ucred->cr_uid && pcred->p_ruid != chgp->p_ucred->cr_uid) return (EPERM); if (n > PRIO_MAX) n = PRIO_MAX; if (n < PRIO_MIN) n = PRIO_MIN; if (n < chgp->p_nice && suser(pcred->pc_ucred, &curp->p_acflag)) return (EACCES); chgp->p_nice = n; (void)resetpriority(chgp); return (0); } /* rtprio system call */ #ifndef _SYS_SYSPROTO_H_ struct rtprio_args { int function; pid_t pid; struct rtprio *rtp; }; #endif /* * Set realtime priority */ /* ARGSUSED */ int rtprio(curp, uap) struct proc *curp; register struct rtprio_args *uap; { register struct proc *p; register struct pcred *pcred = curp->p_cred; struct rtprio rtp; int error; error = copyin(uap->rtp, &rtp, sizeof(struct rtprio)); if (error) return (error); if (uap->pid == 0) p = curp; else p = pfind(uap->pid); if (p == 0) return (ESRCH); switch (uap->function) { case RTP_LOOKUP: return (copyout(&p->p_rtprio, uap->rtp, sizeof(struct rtprio))); case RTP_SET: if (pcred->pc_ucred->cr_uid && pcred->p_ruid && pcred->pc_ucred->cr_uid != p->p_ucred->cr_uid && pcred->p_ruid != p->p_ucred->cr_uid) return (EPERM); /* disallow setting rtprio in most cases if not superuser */ if (suser(pcred->pc_ucred, &curp->p_acflag)) { /* can't set someone else's */ if (uap->pid) return (EPERM); /* can't set realtime priority */ /* * Realtime priority has to be restricted for reasons which should be * obvious. However, for idle priority, there is a potential for * system deadlock if an idleprio process gains a lock on a resource * that other processes need (and the idleprio process can't run * due to a CPU-bound normal process). Fix me! XXX */ #if 0 if (rtp.type == RTP_PRIO_REALTIME) #endif if (rtp.type != RTP_PRIO_NORMAL) return (EPERM); } switch (rtp.type) { case RTP_PRIO_REALTIME: case RTP_PRIO_NORMAL: case RTP_PRIO_IDLE: if (rtp.prio > RTP_PRIO_MAX) return (EINVAL); p->p_rtprio = rtp; return (0); default: return (EINVAL); } default: return (EINVAL); } } #if defined(COMPAT_43) || defined(COMPAT_SUNOS) #ifndef _SYS_SYSPROTO_H_ struct osetrlimit_args { u_int which; struct orlimit *rlp; }; #endif /* ARGSUSED */ int osetrlimit(p, uap) struct proc *p; register struct osetrlimit_args *uap; { struct orlimit olim; struct rlimit lim; int error; if ((error = copyin((caddr_t)uap->rlp, (caddr_t)&olim, sizeof(struct orlimit)))) return (error); lim.rlim_cur = olim.rlim_cur; lim.rlim_max = olim.rlim_max; return (dosetrlimit(p, uap->which, &lim)); } #ifndef _SYS_SYSPROTO_H_ struct ogetrlimit_args { u_int which; struct orlimit *rlp; }; #endif /* ARGSUSED */ int ogetrlimit(p, uap) struct proc *p; register struct ogetrlimit_args *uap; { struct orlimit olim; if (uap->which >= RLIM_NLIMITS) return (EINVAL); olim.rlim_cur = p->p_rlimit[uap->which].rlim_cur; if (olim.rlim_cur == -1) olim.rlim_cur = 0x7fffffff; olim.rlim_max = p->p_rlimit[uap->which].rlim_max; if (olim.rlim_max == -1) olim.rlim_max = 0x7fffffff; return (copyout((caddr_t)&olim, (caddr_t)uap->rlp, sizeof(olim))); } #endif /* COMPAT_43 || COMPAT_SUNOS */ #ifndef _SYS_SYSPROTO_H_ struct __setrlimit_args { u_int which; struct rlimit *rlp; }; #endif /* ARGSUSED */ int setrlimit(p, uap) struct proc *p; register struct __setrlimit_args *uap; { struct rlimit alim; int error; if ((error = copyin((caddr_t)uap->rlp, (caddr_t)&alim, sizeof (struct rlimit)))) return (error); return (dosetrlimit(p, uap->which, &alim)); } static int dosetrlimit(p, which, limp) struct proc *p; u_int which; struct rlimit *limp; { register struct rlimit *alimp; int error; if (which >= RLIM_NLIMITS) return (EINVAL); alimp = &p->p_rlimit[which]; /* * Preserve historical bugs by treating negative limits as unsigned. */ if (limp->rlim_cur < 0) limp->rlim_cur = RLIM_INFINITY; if (limp->rlim_max < 0) limp->rlim_max = RLIM_INFINITY; if (limp->rlim_cur > alimp->rlim_max || limp->rlim_max > alimp->rlim_max) if ((error = suser(p->p_ucred, &p->p_acflag))) return (error); if (limp->rlim_cur > limp->rlim_max) limp->rlim_cur = limp->rlim_max; if (p->p_limit->p_refcnt > 1 && (p->p_limit->p_lflags & PL_SHAREMOD) == 0) { p->p_limit->p_refcnt--; p->p_limit = limcopy(p->p_limit); alimp = &p->p_rlimit[which]; } switch (which) { case RLIMIT_DATA: if (limp->rlim_cur > MAXDSIZ) limp->rlim_cur = MAXDSIZ; if (limp->rlim_max > MAXDSIZ) limp->rlim_max = MAXDSIZ; break; case RLIMIT_STACK: if (limp->rlim_cur > MAXSSIZ) limp->rlim_cur = MAXSSIZ; if (limp->rlim_max > MAXSSIZ) limp->rlim_max = MAXSSIZ; /* * Stack is allocated to the max at exec time with only * "rlim_cur" bytes accessible. If stack limit is going * up make more accessible, if going down make inaccessible. */ if (limp->rlim_cur != alimp->rlim_cur) { vm_offset_t addr; vm_size_t size; vm_prot_t prot; if (limp->rlim_cur > alimp->rlim_cur) { prot = VM_PROT_ALL; size = limp->rlim_cur - alimp->rlim_cur; addr = USRSTACK - limp->rlim_cur; } else { prot = VM_PROT_NONE; size = alimp->rlim_cur - limp->rlim_cur; addr = USRSTACK - alimp->rlim_cur; } addr = trunc_page(addr); size = round_page(size); (void) vm_map_protect(&p->p_vmspace->vm_map, addr, addr+size, prot, FALSE); } break; case RLIMIT_NOFILE: if (limp->rlim_cur > maxfilesperproc) limp->rlim_cur = maxfilesperproc; if (limp->rlim_max > maxfilesperproc) limp->rlim_max = maxfilesperproc; break; case RLIMIT_NPROC: if (limp->rlim_cur > maxprocperuid) limp->rlim_cur = maxprocperuid; if (limp->rlim_max > maxprocperuid) limp->rlim_max = maxprocperuid; break; } *alimp = *limp; return (0); } #ifndef _SYS_SYSPROTO_H_ struct __getrlimit_args { u_int which; struct rlimit *rlp; }; #endif /* ARGSUSED */ int getrlimit(p, uap) struct proc *p; register struct __getrlimit_args *uap; { if (uap->which >= RLIM_NLIMITS) return (EINVAL); return (copyout((caddr_t)&p->p_rlimit[uap->which], (caddr_t)uap->rlp, sizeof (struct rlimit))); } /* * Transform the running time and tick information in proc p into user, * system, and interrupt time usage. */ void calcru(p, up, sp, ip) struct proc *p; struct timeval *up; struct timeval *sp; struct timeval *ip; { quad_t totusec; u_quad_t u, st, ut, it, tot; long sec, usec; int s; struct timeval tv; s = splstatclock(); st = p->p_sticks; ut = p->p_uticks; it = p->p_iticks; splx(s); tot = st + ut + it; if (tot == 0) { st = 1; tot = 1; } sec = p->p_rtime.tv_sec; usec = p->p_rtime.tv_usec; if (p == curproc) { /* XXX what if it's running on another cpu?? */ /* * Adjust for the current time slice. This is actually fairly * important since the error here is on the order of a time * quantum, which is much greater than the sampling error. */ microtime(&tv); sec += tv.tv_sec - runtime.tv_sec; usec += tv.tv_usec - runtime.tv_usec; } totusec = (quad_t)sec * 1000000 + usec; if (totusec < 0) { #ifndef SMP /* sigh, microtime and fork/exit madness here */ /* XXX no %qd in kernel. Truncate. */ printf("calcru: negative time of %ld usec for pid %d (%s)\n", (long)totusec, p->p_pid, p->p_comm); #endif totusec = 0; } u = totusec; st = (u * st) / tot; sp->tv_sec = st / 1000000; sp->tv_usec = st % 1000000; ut = (u * ut) / tot; up->tv_sec = ut / 1000000; up->tv_usec = ut % 1000000; if (ip != NULL) { it = (u * it) / tot; ip->tv_sec = it / 1000000; ip->tv_usec = it % 1000000; } } #ifndef _SYS_SYSPROTO_H_ struct getrusage_args { int who; struct rusage *rusage; }; #endif /* ARGSUSED */ int getrusage(p, uap) register struct proc *p; register struct getrusage_args *uap; { register struct rusage *rup; switch (uap->who) { case RUSAGE_SELF: rup = &p->p_stats->p_ru; calcru(p, &rup->ru_utime, &rup->ru_stime, NULL); break; 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); }