562 lines
13 KiB
C
562 lines
13 KiB
C
/* $NetBSD: kern_resource.c,v 1.73 2003/08/24 17:52:47 chs Exp $ */
|
|
|
|
/*-
|
|
* 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. 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 8.8 (Berkeley) 2/14/95
|
|
*/
|
|
|
|
#include <sys/cdefs.h>
|
|
__KERNEL_RCSID(0, "$NetBSD: kern_resource.c,v 1.73 2003/08/24 17:52:47 chs Exp $");
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/systm.h>
|
|
#include <sys/kernel.h>
|
|
#include <sys/file.h>
|
|
#include <sys/resourcevar.h>
|
|
#include <sys/malloc.h>
|
|
#include <sys/pool.h>
|
|
#include <sys/proc.h>
|
|
|
|
#include <sys/mount.h>
|
|
#include <sys/sa.h>
|
|
#include <sys/syscallargs.h>
|
|
|
|
#include <uvm/uvm_extern.h>
|
|
|
|
/*
|
|
* Maximum process data and stack limits.
|
|
* They are variables so they are patchable.
|
|
*
|
|
* XXXX Do we really need them to be patchable?
|
|
*/
|
|
rlim_t maxdmap = MAXDSIZ;
|
|
rlim_t maxsmap = MAXSSIZ;
|
|
|
|
/*
|
|
* Resource controls and accounting.
|
|
*/
|
|
|
|
int
|
|
sys_getpriority(l, v, retval)
|
|
struct lwp *l;
|
|
void *v;
|
|
register_t *retval;
|
|
{
|
|
struct sys_getpriority_args /* {
|
|
syscallarg(int) which;
|
|
syscallarg(int) who;
|
|
} */ *uap = v;
|
|
struct proc *curp = l->l_proc, *p;
|
|
int low = NZERO + PRIO_MAX + 1;
|
|
|
|
switch (SCARG(uap, which)) {
|
|
|
|
case PRIO_PROCESS:
|
|
if (SCARG(uap, who) == 0)
|
|
p = curp;
|
|
else
|
|
p = pfind(SCARG(uap, who));
|
|
if (p == 0)
|
|
break;
|
|
low = p->p_nice;
|
|
break;
|
|
|
|
case PRIO_PGRP: {
|
|
struct pgrp *pg;
|
|
|
|
if (SCARG(uap, who) == 0)
|
|
pg = curp->p_pgrp;
|
|
else if ((pg = pgfind(SCARG(uap, who))) == NULL)
|
|
break;
|
|
LIST_FOREACH(p, &pg->pg_members, p_pglist) {
|
|
if (p->p_nice < low)
|
|
low = p->p_nice;
|
|
}
|
|
break;
|
|
}
|
|
|
|
case PRIO_USER:
|
|
if (SCARG(uap, who) == 0)
|
|
SCARG(uap, who) = curp->p_ucred->cr_uid;
|
|
proclist_lock_read();
|
|
LIST_FOREACH(p, &allproc, p_list) {
|
|
if (p->p_ucred->cr_uid == (uid_t) SCARG(uap, who) &&
|
|
p->p_nice < low)
|
|
low = p->p_nice;
|
|
}
|
|
proclist_unlock_read();
|
|
break;
|
|
|
|
default:
|
|
return (EINVAL);
|
|
}
|
|
if (low == NZERO + PRIO_MAX + 1)
|
|
return (ESRCH);
|
|
*retval = low - NZERO;
|
|
return (0);
|
|
}
|
|
|
|
/* ARGSUSED */
|
|
int
|
|
sys_setpriority(l, v, retval)
|
|
struct lwp *l;
|
|
void *v;
|
|
register_t *retval;
|
|
{
|
|
struct sys_setpriority_args /* {
|
|
syscallarg(int) which;
|
|
syscallarg(int) who;
|
|
syscallarg(int) prio;
|
|
} */ *uap = v;
|
|
struct proc *curp = l->l_proc, *p;
|
|
int found = 0, error = 0;
|
|
|
|
switch (SCARG(uap, which)) {
|
|
|
|
case PRIO_PROCESS:
|
|
if (SCARG(uap, who) == 0)
|
|
p = curp;
|
|
else
|
|
p = pfind(SCARG(uap, who));
|
|
if (p == 0)
|
|
break;
|
|
error = donice(curp, p, SCARG(uap, prio));
|
|
found++;
|
|
break;
|
|
|
|
case PRIO_PGRP: {
|
|
struct pgrp *pg;
|
|
|
|
if (SCARG(uap, who) == 0)
|
|
pg = curp->p_pgrp;
|
|
else if ((pg = pgfind(SCARG(uap, who))) == NULL)
|
|
break;
|
|
LIST_FOREACH(p, &pg->pg_members, p_pglist) {
|
|
error = donice(curp, p, SCARG(uap, prio));
|
|
found++;
|
|
}
|
|
break;
|
|
}
|
|
|
|
case PRIO_USER:
|
|
if (SCARG(uap, who) == 0)
|
|
SCARG(uap, who) = curp->p_ucred->cr_uid;
|
|
proclist_lock_read();
|
|
LIST_FOREACH(p, &allproc, p_list) {
|
|
if (p->p_ucred->cr_uid == (uid_t) SCARG(uap, who)) {
|
|
error = donice(curp, p, SCARG(uap, prio));
|
|
found++;
|
|
}
|
|
}
|
|
proclist_unlock_read();
|
|
break;
|
|
|
|
default:
|
|
return (EINVAL);
|
|
}
|
|
if (found == 0)
|
|
return (ESRCH);
|
|
return (error);
|
|
}
|
|
|
|
int
|
|
donice(curp, chgp, n)
|
|
struct proc *curp, *chgp;
|
|
int n;
|
|
{
|
|
struct pcred *pcred = curp->p_cred;
|
|
int s;
|
|
|
|
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;
|
|
n += NZERO;
|
|
if (n < chgp->p_nice && suser(pcred->pc_ucred, &curp->p_acflag))
|
|
return (EACCES);
|
|
chgp->p_nice = n;
|
|
SCHED_LOCK(s);
|
|
(void)resetprocpriority(chgp);
|
|
SCHED_UNLOCK(s);
|
|
return (0);
|
|
}
|
|
|
|
/* ARGSUSED */
|
|
int
|
|
sys_setrlimit(l, v, retval)
|
|
struct lwp *l;
|
|
void *v;
|
|
register_t *retval;
|
|
{
|
|
struct sys_setrlimit_args /* {
|
|
syscallarg(int) which;
|
|
syscallarg(const struct rlimit *) rlp;
|
|
} */ *uap = v;
|
|
struct proc *p = l->l_proc;
|
|
int which = SCARG(uap, which);
|
|
struct rlimit alim;
|
|
int error;
|
|
|
|
error = copyin(SCARG(uap, rlp), &alim, sizeof(struct rlimit));
|
|
if (error)
|
|
return (error);
|
|
return (dosetrlimit(p, p->p_cred, which, &alim));
|
|
}
|
|
|
|
int
|
|
dosetrlimit(p, cred, which, limp)
|
|
struct proc *p;
|
|
struct pcred *cred;
|
|
int which;
|
|
struct rlimit *limp;
|
|
{
|
|
struct rlimit *alimp;
|
|
struct plimit *newplim;
|
|
int error;
|
|
|
|
if ((u_int)which >= RLIM_NLIMITS)
|
|
return (EINVAL);
|
|
|
|
if (limp->rlim_cur < 0 || limp->rlim_max < 0)
|
|
return (EINVAL);
|
|
|
|
alimp = &p->p_rlimit[which];
|
|
/* if we don't change the value, no need to limcopy() */
|
|
if (limp->rlim_cur == alimp->rlim_cur &&
|
|
limp->rlim_max == alimp->rlim_max)
|
|
return 0;
|
|
|
|
if (limp->rlim_cur > limp->rlim_max) {
|
|
/*
|
|
* This is programming error. According to SUSv2, we should
|
|
* return error in this case.
|
|
*/
|
|
return (EINVAL);
|
|
}
|
|
if (limp->rlim_max > alimp->rlim_max
|
|
&& (error = suser(cred->pc_ucred, &p->p_acflag)) != 0)
|
|
return (error);
|
|
|
|
if (p->p_limit->p_refcnt > 1 &&
|
|
(p->p_limit->p_lflags & PL_SHAREMOD) == 0) {
|
|
newplim = limcopy(p->p_limit);
|
|
limfree(p->p_limit);
|
|
p->p_limit = newplim;
|
|
alimp = &p->p_rlimit[which];
|
|
}
|
|
|
|
switch (which) {
|
|
|
|
case RLIMIT_DATA:
|
|
if (limp->rlim_cur > maxdmap)
|
|
limp->rlim_cur = maxdmap;
|
|
if (limp->rlim_max > maxdmap)
|
|
limp->rlim_max = maxdmap;
|
|
break;
|
|
|
|
case RLIMIT_STACK:
|
|
if (limp->rlim_cur > maxsmap)
|
|
limp->rlim_cur = maxsmap;
|
|
if (limp->rlim_max > maxsmap)
|
|
limp->rlim_max = maxsmap;
|
|
|
|
/*
|
|
* Return EINVAL if the new stack size limit is lower than
|
|
* current usage. Otherwise, the process would get SIGSEGV the
|
|
* moment it would try to access anything on it's current stack.
|
|
* This conforms to SUSv2.
|
|
*/
|
|
if (limp->rlim_cur < p->p_vmspace->vm_ssize * PAGE_SIZE
|
|
|| limp->rlim_max < p->p_vmspace->vm_ssize * PAGE_SIZE)
|
|
return (EINVAL);
|
|
|
|
/*
|
|
* Stack is allocated to the max at exec time with
|
|
* only "rlim_cur" bytes accessible (In other words,
|
|
* allocates stack dividing two contiguous regions at
|
|
* "rlim_cur" bytes boundary).
|
|
*
|
|
* Since allocation is done in terms of page, roundup
|
|
* "rlim_cur" (otherwise, contiguous regions
|
|
* overlap). If stack limit is going up make more
|
|
* accessible, if going down make inaccessible.
|
|
*/
|
|
limp->rlim_cur = round_page(limp->rlim_cur);
|
|
if (limp->rlim_cur != alimp->rlim_cur) {
|
|
vaddr_t addr;
|
|
vsize_t size;
|
|
vm_prot_t prot;
|
|
|
|
if (limp->rlim_cur > alimp->rlim_cur) {
|
|
prot = VM_PROT_READ | VM_PROT_WRITE;
|
|
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;
|
|
}
|
|
(void) uvm_map_protect(&p->p_vmspace->vm_map,
|
|
addr, addr+size, prot, FALSE);
|
|
}
|
|
break;
|
|
|
|
case RLIMIT_NOFILE:
|
|
if (limp->rlim_cur > maxfiles)
|
|
limp->rlim_cur = maxfiles;
|
|
if (limp->rlim_max > maxfiles)
|
|
limp->rlim_max = maxfiles;
|
|
break;
|
|
|
|
case RLIMIT_NPROC:
|
|
if (limp->rlim_cur > maxproc)
|
|
limp->rlim_cur = maxproc;
|
|
if (limp->rlim_max > maxproc)
|
|
limp->rlim_max = maxproc;
|
|
break;
|
|
}
|
|
*alimp = *limp;
|
|
return (0);
|
|
}
|
|
|
|
/* ARGSUSED */
|
|
int
|
|
sys_getrlimit(l, v, retval)
|
|
struct lwp *l;
|
|
void *v;
|
|
register_t *retval;
|
|
{
|
|
struct sys_getrlimit_args /* {
|
|
syscallarg(int) which;
|
|
syscallarg(struct rlimit *) rlp;
|
|
} */ *uap = v;
|
|
struct proc *p = l->l_proc;
|
|
int which = SCARG(uap, which);
|
|
|
|
if ((u_int)which >= RLIM_NLIMITS)
|
|
return (EINVAL);
|
|
return (copyout(&p->p_rlimit[which], SCARG(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;
|
|
{
|
|
u_quad_t u, st, ut, it, tot;
|
|
unsigned long sec;
|
|
long usec;
|
|
int s;
|
|
struct timeval tv;
|
|
struct lwp *l;
|
|
|
|
s = splstatclock();
|
|
st = p->p_sticks;
|
|
ut = p->p_uticks;
|
|
it = p->p_iticks;
|
|
splx(s);
|
|
|
|
sec = p->p_rtime.tv_sec;
|
|
usec = p->p_rtime.tv_usec;
|
|
LIST_FOREACH(l, &p->p_lwps, l_sibling) {
|
|
if (l->l_stat == LSONPROC) {
|
|
struct schedstate_percpu *spc;
|
|
|
|
KDASSERT(l->l_cpu != NULL);
|
|
spc = &l->l_cpu->ci_schedstate;
|
|
|
|
/*
|
|
* 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 - spc->spc_runtime.tv_sec;
|
|
usec += tv.tv_usec - spc->spc_runtime.tv_usec;
|
|
}
|
|
}
|
|
|
|
tot = st + ut + it;
|
|
u = sec * 1000000ull + usec;
|
|
|
|
if (tot == 0) {
|
|
/* No ticks, so can't use to share time out, split 50-50 */
|
|
st = ut = u / 2;
|
|
} else {
|
|
st = (u * st) / tot;
|
|
ut = (u * ut) / tot;
|
|
}
|
|
sp->tv_sec = st / 1000000;
|
|
sp->tv_usec = st % 1000000;
|
|
up->tv_sec = ut / 1000000;
|
|
up->tv_usec = ut % 1000000;
|
|
if (ip != NULL) {
|
|
if (it != 0)
|
|
it = (u * it) / tot;
|
|
ip->tv_sec = it / 1000000;
|
|
ip->tv_usec = it % 1000000;
|
|
}
|
|
}
|
|
|
|
/* ARGSUSED */
|
|
int
|
|
sys_getrusage(l, v, retval)
|
|
struct lwp *l;
|
|
void *v;
|
|
register_t *retval;
|
|
{
|
|
struct sys_getrusage_args /* {
|
|
syscallarg(int) who;
|
|
syscallarg(struct rusage *) rusage;
|
|
} */ *uap = v;
|
|
struct rusage *rup;
|
|
struct proc *p = l->l_proc;
|
|
|
|
switch (SCARG(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(rup, SCARG(uap, rusage), sizeof(struct rusage)));
|
|
}
|
|
|
|
void
|
|
ruadd(ru, ru2)
|
|
struct rusage *ru, *ru2;
|
|
{
|
|
long *ip, *ip2;
|
|
int i;
|
|
|
|
timeradd(&ru->ru_utime, &ru2->ru_utime, &ru->ru_utime);
|
|
timeradd(&ru->ru_stime, &ru2->ru_stime, &ru->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;
|
|
{
|
|
struct plimit *newlim;
|
|
size_t l;
|
|
|
|
newlim = pool_get(&plimit_pool, PR_WAITOK);
|
|
memcpy(newlim->pl_rlimit, lim->pl_rlimit,
|
|
sizeof(struct rlimit) * RLIM_NLIMITS);
|
|
if (lim->pl_corename == defcorename) {
|
|
newlim->pl_corename = defcorename;
|
|
} else {
|
|
l = strlen(lim->pl_corename) + 1;
|
|
newlim->pl_corename = malloc(l, M_TEMP, M_WAITOK);
|
|
strlcpy(newlim->pl_corename, lim->pl_corename, l);
|
|
}
|
|
newlim->p_lflags = 0;
|
|
newlim->p_refcnt = 1;
|
|
return (newlim);
|
|
}
|
|
|
|
void
|
|
limfree(lim)
|
|
struct plimit *lim;
|
|
{
|
|
|
|
if (--lim->p_refcnt > 0)
|
|
return;
|
|
#ifdef DIAGNOSTIC
|
|
if (lim->p_refcnt < 0)
|
|
panic("limfree");
|
|
#endif
|
|
if (lim->pl_corename != defcorename)
|
|
free(lim->pl_corename, M_TEMP);
|
|
pool_put(&plimit_pool, lim);
|
|
}
|
|
|
|
struct pstats *
|
|
pstatscopy(ps)
|
|
struct pstats *ps;
|
|
{
|
|
|
|
struct pstats *newps;
|
|
|
|
newps = pool_get(&pstats_pool, PR_WAITOK);
|
|
|
|
memset(&newps->pstat_startzero, 0,
|
|
(unsigned) ((caddr_t)&newps->pstat_endzero -
|
|
(caddr_t)&newps->pstat_startzero));
|
|
memcpy(&newps->pstat_startcopy, &ps->pstat_startcopy,
|
|
((caddr_t)&newps->pstat_endcopy -
|
|
(caddr_t)&newps->pstat_startcopy));
|
|
|
|
return (newps);
|
|
|
|
}
|
|
|
|
void
|
|
pstatsfree(ps)
|
|
struct pstats *ps;
|
|
{
|
|
|
|
pool_put(&pstats_pool, ps);
|
|
}
|