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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 1.31 2007/02/03 17:05:58 corecode Exp $
43 #include "opt_compat.h"
45 #include <sys/param.h>
46 #include <sys/systm.h>
47 #include <sys/sysproto.h>
49 #include <sys/kern_syscall.h>
50 #include <sys/kernel.h>
51 #include <sys/resourcevar.h>
52 #include <sys/malloc.h>
55 #include <sys/lockf.h>
58 #include <vm/vm_param.h>
61 #include <vm/vm_map.h>
63 #include <sys/thread2.h>
65 static int donice (struct proc *chgp, int n);
67 static MALLOC_DEFINE(M_UIDINFO, "uidinfo", "uidinfo structures");
68 #define UIHASH(uid) (&uihashtbl[(uid) & uihash])
69 static LIST_HEAD(uihashhead, uidinfo) *uihashtbl;
70 static u_long uihash; /* size of hash table - 1 */
72 static struct uidinfo *uicreate (uid_t uid);
73 static struct uidinfo *uilookup (uid_t uid);
76 * Resource controls and accounting.
79 struct getpriority_info {
84 static int getpriority_callback(struct proc *p, void *data);
87 sys_getpriority(struct getpriority_args *uap)
89 struct getpriority_info info;
90 struct proc *curp = curproc;
92 int low = PRIO_MAX + 1;
102 if (!PRISON_CHECK(curp->p_ucred, p->p_ucred))
113 else if ((pg = pgfind(uap->who)) == NULL)
115 LIST_FOREACH(p, &pg->pg_members, p_pglist) {
116 if ((PRISON_CHECK(curp->p_ucred, p->p_ucred) && p->p_nice < low))
123 uap->who = curp->p_ucred->cr_uid;
126 allproc_scan(getpriority_callback, &info);
133 if (low == PRIO_MAX + 1)
135 uap->sysmsg_result = low;
140 * Figure out the current lowest nice priority for processes owned
141 * by the specified user.
145 getpriority_callback(struct proc *p, void *data)
147 struct getpriority_info *info = data;
149 if (PRISON_CHECK(curproc->p_ucred, p->p_ucred) &&
150 p->p_ucred->cr_uid == info->who &&
151 p->p_nice < info->low) {
152 info->low = p->p_nice;
157 struct setpriority_info {
164 static int setpriority_callback(struct proc *p, void *data);
167 sys_setpriority(struct setpriority_args *uap)
169 struct setpriority_info info;
170 struct proc *curp = curproc;
172 int found = 0, error = 0;
174 switch (uap->which) {
182 if (!PRISON_CHECK(curp->p_ucred, p->p_ucred))
184 error = donice(p, uap->prio);
194 else if ((pg = pgfind(uap->who)) == NULL)
196 LIST_FOREACH(p, &pg->pg_members, p_pglist) {
197 if (PRISON_CHECK(curp->p_ucred, p->p_ucred)) {
198 error = donice(p, uap->prio);
206 uap->who = curp->p_ucred->cr_uid;
207 info.prio = uap->prio;
211 allproc_scan(setpriority_callback, &info);
226 setpriority_callback(struct proc *p, void *data)
228 struct setpriority_info *info = data;
231 if (p->p_ucred->cr_uid == info->who &&
232 PRISON_CHECK(curproc->p_ucred, p->p_ucred)) {
233 error = donice(p, info->prio);
242 donice(struct proc *chgp, int n)
244 struct proc *curp = curproc;
245 struct ucred *cr = curp->p_ucred;
248 if (cr->cr_uid && cr->cr_ruid &&
249 cr->cr_uid != chgp->p_ucred->cr_uid &&
250 cr->cr_ruid != chgp->p_ucred->cr_uid)
256 if (n < chgp->p_nice && suser_cred(cr, 0))
259 FOREACH_LWP_IN_PROC(lp, chgp)
260 chgp->p_usched->resetpriority(lp);
265 * Set realtime priority
269 sys_rtprio(struct rtprio_args *uap)
271 struct proc *curp = curproc;
274 struct ucred *cr = curp->p_ucred;
278 error = copyin(uap->rtp, &rtp, sizeof(struct rtprio));
291 lp = FIRST_LWP_IN_PROC(p);
292 switch (uap->function) {
294 return (copyout(&lp->lwp_rtprio, uap->rtp, sizeof(struct rtprio)));
296 if (cr->cr_uid && cr->cr_ruid &&
297 cr->cr_uid != p->p_ucred->cr_uid &&
298 cr->cr_ruid != p->p_ucred->cr_uid)
300 /* disallow setting rtprio in most cases if not superuser */
301 if (suser_cred(cr, 0)) {
302 /* can't set someone else's */
305 /* can't set realtime priority */
307 * Realtime priority has to be restricted for reasons which should be
308 * obvious. However, for idle priority, there is a potential for
309 * system deadlock if an idleprio process gains a lock on a resource
310 * that other processes need (and the idleprio process can't run
311 * due to a CPU-bound normal process). Fix me! XXX
313 if (RTP_PRIO_IS_REALTIME(rtp.type))
320 case RTP_PRIO_REALTIME:
321 case RTP_PRIO_NORMAL:
323 if (rtp.prio > RTP_PRIO_MAX)
325 lp->lwp_rtprio = rtp;
337 sys_setrlimit(struct __setrlimit_args *uap)
342 error = copyin(uap->rlp, &alim, sizeof(alim));
346 error = kern_setrlimit(uap->which, &alim);
352 sys_getrlimit(struct __getrlimit_args *uap)
357 error = kern_getrlimit(uap->which, &lim);
360 error = copyout(&lim, uap->rlp, sizeof(*uap->rlp));
365 * Transform the running time and tick information in lwp lp's thread into user,
366 * system, and interrupt time usage.
368 * Since we are limited to statclock tick granularity this is a statisical
369 * calculation which will be correct over the long haul, but should not be
370 * expected to measure fine grained deltas.
373 calcru(struct lwp *lp, struct timeval *up, struct timeval *sp)
375 struct thread *td = lp->lwp_thread;
378 * Calculate at the statclock level. YYY if the thread is owned by
379 * another cpu we need to forward the request to the other cpu, or
380 * have a token to interlock the information.
383 up->tv_sec = td->td_uticks / 1000000;
384 up->tv_usec = td->td_uticks % 1000000;
385 sp->tv_sec = td->td_sticks / 1000000;
386 sp->tv_usec = td->td_sticks % 1000000;
391 * Aggregate resource statistics of all lwps of a process.
393 * proc.p_ru keeps track of all statistics directly related to a proc. This
394 * consists of RSS usage and nswap information and aggregate numbers for all
395 * former lwps of this proc.
397 * proc.p_cru is the sum of all stats of reaped children.
399 * lwp.lwp_ru contains the stats directly related to one specific lwp, meaning
400 * packet, scheduler switch or page fault counts, etc. This information gets
401 * added to lwp.lwp_proc.p_ru when the lwp exits.
404 calcru_proc(struct proc *p, struct rusage *ru)
406 struct timeval upt, spt;
412 FOREACH_LWP_IN_PROC(lp, p) {
413 calcru(lp, &upt, &spt);
414 timevaladd(&ru->ru_utime, &upt);
415 timevaladd(&ru->ru_stime, &spt);
416 for (rip1 = &ru->ru_first, rip2 = &lp->lwp_ru.ru_first;
417 rip1 <= &ru->ru_last;
426 sys_getrusage(struct getrusage_args *uap)
435 calcru_proc(curproc, rup);
438 case RUSAGE_CHILDREN:
439 rup = &curproc->p_cru;
445 return (copyout((caddr_t)rup, (caddr_t)uap->rusage,
446 sizeof (struct rusage)));
450 ruadd(struct rusage *ru, struct rusage *ru2)
455 timevaladd(&ru->ru_utime, &ru2->ru_utime);
456 timevaladd(&ru->ru_stime, &ru2->ru_stime);
457 if (ru->ru_maxrss < ru2->ru_maxrss)
458 ru->ru_maxrss = ru2->ru_maxrss;
459 ip = &ru->ru_first; ip2 = &ru2->ru_first;
460 for (i = &ru->ru_last - &ru->ru_first; i >= 0; i--)
465 * Find the uidinfo structure for a uid. This structure is used to
466 * track the total resource consumption (process count, socket buffer
467 * size, etc.) for the uid and impose limits.
472 uihashtbl = hashinit(maxproc / 16, M_UIDINFO, &uihash);
475 static struct uidinfo *
478 struct uihashhead *uipp;
482 LIST_FOREACH(uip, uipp, ui_hash) {
483 if (uip->ui_uid == uid)
489 static struct uidinfo *
492 struct uidinfo *uip, *norace;
495 * Allocate space and check for a race
497 MALLOC(uip, struct uidinfo *, sizeof(*uip), M_UIDINFO, M_WAITOK);
498 norace = uilookup(uid);
499 if (norace != NULL) {
500 FREE(uip, M_UIDINFO);
505 * Initialize structure and enter it into the hash table
507 LIST_INSERT_HEAD(UIHASH(uid), uip, ui_hash);
512 uip->ui_posixlocks = 0;
513 varsymset_init(&uip->ui_varsymset, NULL);
530 uifree(struct uidinfo *uip)
532 if (uip->ui_sbsize != 0)
533 /* XXX no %qd in kernel. Truncate. */
534 kprintf("freeing uidinfo: uid = %d, sbsize = %ld\n",
535 uip->ui_uid, (long)uip->ui_sbsize);
536 if (uip->ui_proccnt != 0)
537 kprintf("freeing uidinfo: uid = %d, proccnt = %ld\n",
538 uip->ui_uid, uip->ui_proccnt);
539 LIST_REMOVE(uip, ui_hash);
540 varsymset_clean(&uip->ui_varsymset);
541 FREE(uip, M_UIDINFO);
545 uihold(struct uidinfo *uip)
548 KKASSERT(uip->ui_ref > 0);
552 uidrop(struct uidinfo *uip)
554 KKASSERT(uip->ui_ref > 0);
555 if (--uip->ui_ref == 0)
560 uireplace(struct uidinfo **puip, struct uidinfo *nuip)
567 * Change the count associated with number of processes
568 * a given user is using. When 'max' is 0, don't enforce a limit
571 chgproccnt(struct uidinfo *uip, int diff, int max)
573 /* don't allow them to exceed max, but allow subtraction */
574 if (diff > 0 && uip->ui_proccnt + diff > max && max != 0)
576 uip->ui_proccnt += diff;
577 if (uip->ui_proccnt < 0)
578 kprintf("negative proccnt for uid = %d\n", uip->ui_uid);
583 * Change the total socket buffer size a user has used.
586 chgsbsize(struct uidinfo *uip, u_long *hiwat, u_long to, rlim_t max)
591 new = uip->ui_sbsize + to - *hiwat;
592 /* don't allow them to exceed max, but allow subtraction */
593 if (to > *hiwat && new > max) {
597 uip->ui_sbsize = new;
599 if (uip->ui_sbsize < 0)
600 kprintf("negative sbsize for uid = %d\n", uip->ui_uid);