2 * Copyright (c) 1982, 1986, 1991, 1993
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4 * (c) UNIX System Laboratories, Inc.
5 * All or some portions of this file are derived from material licensed
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38 * @(#)kern_resource.c 8.5 (Berkeley) 1/21/94
39 * $FreeBSD: src/sys/kern/kern_resource.c,v 1.55.2.5 2001/11/03 01:41:08 ps Exp $
40 * $DragonFly: src/sys/kern/kern_resource.c,v 1.6 2003/06/25 03:55:57 dillon Exp $
43 #include "opt_compat.h"
45 #include <sys/param.h>
46 #include <sys/systm.h>
47 #include <sys/sysproto.h>
49 #include <sys/kernel.h>
50 #include <sys/resourcevar.h>
51 #include <sys/malloc.h>
56 #include <vm/vm_param.h>
59 #include <vm/vm_map.h>
61 static int donice __P((struct proc *chgp, int n));
62 /* dosetrlimit non-static: Needed by SysVR4 emulator */
63 int dosetrlimit __P((u_int which, struct rlimit *limp));
65 static MALLOC_DEFINE(M_UIDINFO, "uidinfo", "uidinfo structures");
66 #define UIHASH(uid) (&uihashtbl[(uid) & uihash])
67 static LIST_HEAD(uihashhead, uidinfo) *uihashtbl;
68 static u_long uihash; /* size of hash table - 1 */
70 static struct uidinfo *uicreate __P((uid_t uid));
71 static struct uidinfo *uilookup __P((uid_t uid));
74 * Resource controls and accounting.
77 #ifndef _SYS_SYSPROTO_H_
78 struct getpriority_args {
84 getpriority(struct getpriority_args *uap)
86 struct proc *curp = curproc;
88 int low = PRIO_MAX + 1;
98 if (!PRISON_CHECK(curp->p_ucred, p->p_ucred))
105 register struct pgrp *pg;
109 else if ((pg = pgfind(uap->who)) == NULL)
111 LIST_FOREACH(p, &pg->pg_members, p_pglist) {
112 if ((PRISON_CHECK(curp->p_ucred, p->p_ucred) && p->p_nice < low))
119 uap->who = curp->p_ucred->cr_uid;
120 LIST_FOREACH(p, &allproc, p_list)
121 if (PRISON_CHECK(curp->p_ucred, p->p_ucred) &&
122 p->p_ucred->cr_uid == uap->who &&
130 if (low == PRIO_MAX + 1)
132 curp->p_retval[0] = low;
136 #ifndef _SYS_SYSPROTO_H_
137 struct setpriority_args {
145 setpriority(struct setpriority_args *uap)
147 struct proc *curp = curproc;
149 int found = 0, error = 0;
151 switch (uap->which) {
160 if (!PRISON_CHECK(curp->p_ucred, p->p_ucred))
162 error = donice(p, uap->prio);
168 register struct pgrp *pg;
172 else if ((pg = pgfind(uap->who)) == NULL)
174 LIST_FOREACH(p, &pg->pg_members, p_pglist) {
175 if (PRISON_CHECK(curp->p_ucred, p->p_ucred)) {
176 error = donice(p, uap->prio);
184 uap->who = curp->p_ucred->cr_uid;
185 LIST_FOREACH(p, &allproc, p_list)
186 if (p->p_ucred->cr_uid == uap->who &&
187 PRISON_CHECK(curp->p_ucred, p->p_ucred)) {
188 error = donice(p, uap->prio);
202 donice(struct proc *chgp, int n)
204 struct proc *curp = curproc;
205 struct ucred *cr = curp->p_ucred;
207 if (cr->cr_uid && cr->cr_ruid &&
208 cr->cr_uid != chgp->p_ucred->cr_uid &&
209 cr->cr_ruid != chgp->p_ucred->cr_uid)
215 if (n < chgp->p_nice && suser_cred(cr, 0))
218 (void)resetpriority(chgp);
222 /* rtprio system call */
223 #ifndef _SYS_SYSPROTO_H_
232 * Set realtime priority
237 rtprio(register struct rtprio_args *uap)
239 struct proc *curp = curproc;
241 struct ucred *cr = curp->p_ucred;
245 error = copyin(uap->rtp, &rtp, sizeof(struct rtprio));
257 switch (uap->function) {
259 return (copyout(&p->p_rtprio, uap->rtp, sizeof(struct rtprio)));
261 if (cr->cr_uid && cr->cr_ruid &&
262 cr->cr_uid != p->p_ucred->cr_uid &&
263 cr->cr_ruid != p->p_ucred->cr_uid)
265 /* disallow setting rtprio in most cases if not superuser */
266 if (suser_cred(cr, 0)) {
267 /* can't set someone else's */
270 /* can't set realtime priority */
272 * Realtime priority has to be restricted for reasons which should be
273 * obvious. However, for idle priority, there is a potential for
274 * system deadlock if an idleprio process gains a lock on a resource
275 * that other processes need (and the idleprio process can't run
276 * due to a CPU-bound normal process). Fix me! XXX
279 if (RTP_PRIO_IS_REALTIME(rtp.type))
281 if (rtp.type != RTP_PRIO_NORMAL)
288 case RTP_PRIO_REALTIME:
289 case RTP_PRIO_NORMAL:
291 if (rtp.prio > RTP_PRIO_MAX)
304 #if defined(COMPAT_43) || defined(COMPAT_SUNOS)
305 #ifndef _SYS_SYSPROTO_H_
306 struct osetrlimit_args {
313 osetrlimit(struct osetrlimit_args *uap)
320 copyin((caddr_t)uap->rlp, (caddr_t)&olim, sizeof(struct orlimit))))
322 lim.rlim_cur = olim.rlim_cur;
323 lim.rlim_max = olim.rlim_max;
324 return (dosetrlimit(uap->which, &lim));
327 #ifndef _SYS_SYSPROTO_H_
328 struct ogetrlimit_args {
335 ogetrlimit(struct ogetrlimit_args *uap)
337 struct proc *p = curproc;
340 if (uap->which >= RLIM_NLIMITS)
342 olim.rlim_cur = p->p_rlimit[uap->which].rlim_cur;
343 if (olim.rlim_cur == -1)
344 olim.rlim_cur = 0x7fffffff;
345 olim.rlim_max = p->p_rlimit[uap->which].rlim_max;
346 if (olim.rlim_max == -1)
347 olim.rlim_max = 0x7fffffff;
348 return (copyout((caddr_t)&olim, (caddr_t)uap->rlp, sizeof(olim)));
350 #endif /* COMPAT_43 || COMPAT_SUNOS */
352 #ifndef _SYS_SYSPROTO_H_
353 struct __setrlimit_args {
360 setrlimit(struct __setrlimit_args *uap)
366 copyin((caddr_t)uap->rlp, (caddr_t)&alim, sizeof (struct rlimit))))
368 return (dosetrlimit(uap->which, &alim));
372 dosetrlimit(u_int which, struct rlimit *limp)
374 struct proc *p = curproc;
375 struct rlimit *alimp;
378 if (which >= RLIM_NLIMITS)
380 alimp = &p->p_rlimit[which];
383 * Preserve historical bugs by treating negative limits as unsigned.
385 if (limp->rlim_cur < 0)
386 limp->rlim_cur = RLIM_INFINITY;
387 if (limp->rlim_max < 0)
388 limp->rlim_max = RLIM_INFINITY;
390 if (limp->rlim_cur > alimp->rlim_max ||
391 limp->rlim_max > alimp->rlim_max)
392 if ((error = suser_cred(p->p_ucred, PRISON_ROOT)))
394 if (limp->rlim_cur > limp->rlim_max)
395 limp->rlim_cur = limp->rlim_max;
396 if (p->p_limit->p_refcnt > 1 &&
397 (p->p_limit->p_lflags & PL_SHAREMOD) == 0) {
398 p->p_limit->p_refcnt--;
399 p->p_limit = limcopy(p->p_limit);
400 alimp = &p->p_rlimit[which];
406 if (limp->rlim_cur > RLIM_INFINITY / (rlim_t)1000000)
407 p->p_limit->p_cpulimit = RLIM_INFINITY;
409 p->p_limit->p_cpulimit =
410 (rlim_t)1000000 * limp->rlim_cur;
413 if (limp->rlim_cur > maxdsiz)
414 limp->rlim_cur = maxdsiz;
415 if (limp->rlim_max > maxdsiz)
416 limp->rlim_max = maxdsiz;
420 if (limp->rlim_cur > maxssiz)
421 limp->rlim_cur = maxssiz;
422 if (limp->rlim_max > maxssiz)
423 limp->rlim_max = maxssiz;
425 * Stack is allocated to the max at exec time with only
426 * "rlim_cur" bytes accessible. If stack limit is going
427 * up make more accessible, if going down make inaccessible.
429 if (limp->rlim_cur != alimp->rlim_cur) {
434 if (limp->rlim_cur > alimp->rlim_cur) {
436 size = limp->rlim_cur - alimp->rlim_cur;
437 addr = USRSTACK - limp->rlim_cur;
440 size = alimp->rlim_cur - limp->rlim_cur;
441 addr = USRSTACK - alimp->rlim_cur;
443 addr = trunc_page(addr);
444 size = round_page(size);
445 (void) vm_map_protect(&p->p_vmspace->vm_map,
446 addr, addr+size, prot, FALSE);
451 if (limp->rlim_cur > maxfilesperproc)
452 limp->rlim_cur = maxfilesperproc;
453 if (limp->rlim_max > maxfilesperproc)
454 limp->rlim_max = maxfilesperproc;
458 if (limp->rlim_cur > maxprocperuid)
459 limp->rlim_cur = maxprocperuid;
460 if (limp->rlim_max > maxprocperuid)
461 limp->rlim_max = maxprocperuid;
462 if (limp->rlim_cur < 1)
464 if (limp->rlim_max < 1)
472 #ifndef _SYS_SYSPROTO_H_
473 struct __getrlimit_args {
480 getrlimit(struct __getrlimit_args *uap)
482 struct proc *p = curproc;
484 if (uap->which >= RLIM_NLIMITS)
486 return (copyout((caddr_t)&p->p_rlimit[uap->which], (caddr_t)uap->rlp,
487 sizeof (struct rlimit)));
491 * Transform the running time and tick information in proc p into user,
492 * system, and interrupt time usage.
494 * Since we are limited to statclock tick granularity this is a statisical
495 * calculation which will be correct over the long haul, but should not be
496 * expected to measure fine grained deltas.
499 calcru(p, up, sp, ip)
505 struct thread *td = p->p_thread;
509 * Calculate at the statclock level. YYY if the thread is owned by
510 * another cpu we need to forward the request to the other cpu, or
511 * have a token to interlock the information.
514 up->tv_sec = td->td_uticks / 1000000;
515 up->tv_usec = td->td_uticks % 1000000;
516 sp->tv_sec = td->td_sticks / 1000000;
517 sp->tv_usec = td->td_sticks % 1000000;
519 ip->tv_sec = td->td_iticks / 1000000;
520 ip->tv_usec = td->td_iticks % 1000000;
525 #ifndef _SYS_SYSPROTO_H_
526 struct getrusage_args {
528 struct rusage *rusage;
533 getrusage(struct getrusage_args *uap)
535 struct proc *p = curproc;
541 rup = &p->p_stats->p_ru;
542 calcru(p, &rup->ru_utime, &rup->ru_stime, NULL);
545 case RUSAGE_CHILDREN:
546 rup = &p->p_stats->p_cru;
552 return (copyout((caddr_t)rup, (caddr_t)uap->rusage,
553 sizeof (struct rusage)));
558 register struct rusage *ru, *ru2;
560 register long *ip, *ip2;
563 timevaladd(&ru->ru_utime, &ru2->ru_utime);
564 timevaladd(&ru->ru_stime, &ru2->ru_stime);
565 if (ru->ru_maxrss < ru2->ru_maxrss)
566 ru->ru_maxrss = ru2->ru_maxrss;
567 ip = &ru->ru_first; ip2 = &ru2->ru_first;
568 for (i = &ru->ru_last - &ru->ru_first; i >= 0; i--)
573 * Make a copy of the plimit structure.
574 * We share these structures copy-on-write after fork,
575 * and copy when a limit is changed.
581 register struct plimit *copy;
583 MALLOC(copy, struct plimit *, sizeof(struct plimit),
584 M_SUBPROC, M_WAITOK);
585 bcopy(lim->pl_rlimit, copy->pl_rlimit, sizeof(struct plimit));
592 * Find the uidinfo structure for a uid. This structure is used to
593 * track the total resource consumption (process count, socket buffer
594 * size, etc.) for the uid and impose limits.
599 uihashtbl = hashinit(maxproc / 16, M_UIDINFO, &uihash);
602 static struct uidinfo *
606 struct uihashhead *uipp;
610 LIST_FOREACH(uip, uipp, ui_hash)
611 if (uip->ui_uid == uid)
617 static struct uidinfo *
621 struct uidinfo *uip, *norace;
623 MALLOC(uip, struct uidinfo *, sizeof(*uip), M_UIDINFO, M_NOWAIT);
625 MALLOC(uip, struct uidinfo *, sizeof(*uip), M_UIDINFO, M_WAITOK);
627 * if we M_WAITOK we must look afterwards or risk
630 norace = uilookup(uid);
631 if (norace != NULL) {
632 FREE(uip, M_UIDINFO);
636 LIST_INSERT_HEAD(UIHASH(uid), uip, ui_hash);
662 if (--uip->ui_ref == 0) {
663 if (uip->ui_sbsize != 0)
664 /* XXX no %qd in kernel. Truncate. */
665 printf("freeing uidinfo: uid = %d, sbsize = %ld\n",
666 uip->ui_uid, (long)uip->ui_sbsize);
667 if (uip->ui_proccnt != 0)
668 printf("freeing uidinfo: uid = %d, proccnt = %ld\n",
669 uip->ui_uid, uip->ui_proccnt);
670 LIST_REMOVE(uip, ui_hash);
671 FREE(uip, M_UIDINFO);
678 * Change the count associated with number of processes
679 * a given user is using. When 'max' is 0, don't enforce a limit
682 chgproccnt(uip, diff, max)
687 /* don't allow them to exceed max, but allow subtraction */
688 if (diff > 0 && uip->ui_proccnt + diff > max && max != 0)
690 uip->ui_proccnt += diff;
691 if (uip->ui_proccnt < 0)
692 printf("negative proccnt for uid = %d\n", uip->ui_uid);
697 * Change the total socket buffer size a user has used.
700 chgsbsize(uip, hiwat, to, max)
710 new = uip->ui_sbsize + to - *hiwat;
711 /* don't allow them to exceed max, but allow subtraction */
712 if (to > *hiwat && new > max) {
716 uip->ui_sbsize = new;
718 if (uip->ui_sbsize < 0)
719 printf("negative sbsize for uid = %d\n", uip->ui_uid);