kern_resource.c revision 1.23
1 /* $NetBSD: kern_resource.c,v 1.23 1994/11/17 20:27:10 christos Exp $ */ 2 3 /*- 4 * Copyright (c) 1982, 1986, 1991, 1993 5 * The Regents of the University of California. All rights reserved. 6 * (c) UNIX System Laboratories, Inc. 7 * All or some portions of this file are derived from material licensed 8 * to the University of California by American Telephone and Telegraph 9 * Co. or Unix System Laboratories, Inc. and are reproduced herein with 10 * the permission of UNIX System Laboratories, Inc. 11 * 12 * Redistribution and use in source and binary forms, with or without 13 * modification, are permitted provided that the following conditions 14 * are met: 15 * 1. Redistributions of source code must retain the above copyright 16 * notice, this list of conditions and the following disclaimer. 17 * 2. Redistributions in binary form must reproduce the above copyright 18 * notice, this list of conditions and the following disclaimer in the 19 * documentation and/or other materials provided with the distribution. 20 * 3. All advertising materials mentioning features or use of this software 21 * must display the following acknowledgement: 22 * This product includes software developed by the University of 23 * California, Berkeley and its contributors. 24 * 4. Neither the name of the University nor the names of its contributors 25 * may be used to endorse or promote products derived from this software 26 * without specific prior written permission. 27 * 28 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 29 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 30 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 31 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 32 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 33 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 34 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 35 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 36 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 37 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 38 * SUCH DAMAGE. 39 * 40 * @(#)kern_resource.c 8.5 (Berkeley) 1/21/94 41 */ 42 43 #include <sys/param.h> 44 #include <sys/systm.h> 45 #include <sys/kernel.h> 46 #include <sys/file.h> 47 #include <sys/resourcevar.h> 48 #include <sys/malloc.h> 49 #include <sys/proc.h> 50 51 #include <sys/mount.h> 52 #include <sys/syscallargs.h> 53 54 #include <vm/vm.h> 55 56 /* 57 * Resource controls and accounting. 58 */ 59 60 getpriority(curp, uap, retval) 61 struct proc *curp; 62 register struct getpriority_args /* { 63 syscallarg(int) which; 64 syscallarg(int) who; 65 } */ *uap; 66 register_t *retval; 67 { 68 register struct proc *p; 69 register int low = PRIO_MAX + 1; 70 71 switch (SCARG(uap, which)) { 72 73 case PRIO_PROCESS: 74 if (SCARG(uap, who) == 0) 75 p = curp; 76 else 77 p = pfind(SCARG(uap, who)); 78 if (p == 0) 79 break; 80 low = p->p_nice; 81 break; 82 83 case PRIO_PGRP: { 84 register struct pgrp *pg; 85 86 if (SCARG(uap, who) == 0) 87 pg = curp->p_pgrp; 88 else if ((pg = pgfind(SCARG(uap, who))) == NULL) 89 break; 90 for (p = pg->pg_members.lh_first; p != 0; p = p->p_pglist.le_next) { 91 if (p->p_nice < low) 92 low = p->p_nice; 93 } 94 break; 95 } 96 97 case PRIO_USER: 98 if (SCARG(uap, who) == 0) 99 SCARG(uap, who) = curp->p_ucred->cr_uid; 100 for (p = allproc.lh_first; p != 0; p = p->p_list.le_next) 101 if (p->p_ucred->cr_uid == SCARG(uap, who) && 102 p->p_nice < low) 103 low = p->p_nice; 104 break; 105 106 default: 107 return (EINVAL); 108 } 109 if (low == PRIO_MAX + 1) 110 return (ESRCH); 111 *retval = low; 112 return (0); 113 } 114 115 /* ARGSUSED */ 116 setpriority(curp, uap, retval) 117 struct proc *curp; 118 register struct setpriority_args /* { 119 syscallarg(int) which; 120 syscallarg(int) who; 121 syscallarg(int) prio; 122 } */ *uap; 123 register_t *retval; 124 { 125 register struct proc *p; 126 int found = 0, error = 0; 127 128 switch (SCARG(uap, which)) { 129 130 case PRIO_PROCESS: 131 if (SCARG(uap, who) == 0) 132 p = curp; 133 else 134 p = pfind(SCARG(uap, who)); 135 if (p == 0) 136 break; 137 error = donice(curp, p, SCARG(uap, prio)); 138 found++; 139 break; 140 141 case PRIO_PGRP: { 142 register struct pgrp *pg; 143 144 if (SCARG(uap, who) == 0) 145 pg = curp->p_pgrp; 146 else if ((pg = pgfind(SCARG(uap, who))) == NULL) 147 break; 148 for (p = pg->pg_members.lh_first; p != 0; 149 p = p->p_pglist.le_next) { 150 error = donice(curp, p, SCARG(uap, prio)); 151 found++; 152 } 153 break; 154 } 155 156 case PRIO_USER: 157 if (SCARG(uap, who) == 0) 158 SCARG(uap, who) = curp->p_ucred->cr_uid; 159 for (p = allproc.lh_first; p != 0; p = p->p_list.le_next) 160 if (p->p_ucred->cr_uid == SCARG(uap, who)) { 161 error = donice(curp, p, SCARG(uap, prio)); 162 found++; 163 } 164 break; 165 166 default: 167 return (EINVAL); 168 } 169 if (found == 0) 170 return (ESRCH); 171 return (error); 172 } 173 174 donice(curp, chgp, n) 175 register struct proc *curp, *chgp; 176 register int n; 177 { 178 register struct pcred *pcred = curp->p_cred; 179 180 if (pcred->pc_ucred->cr_uid && pcred->p_ruid && 181 pcred->pc_ucred->cr_uid != chgp->p_ucred->cr_uid && 182 pcred->p_ruid != chgp->p_ucred->cr_uid) 183 return (EPERM); 184 if (n > PRIO_MAX) 185 n = PRIO_MAX; 186 if (n < PRIO_MIN) 187 n = PRIO_MIN; 188 if (n < chgp->p_nice && suser(pcred->pc_ucred, &curp->p_acflag)) 189 return (EACCES); 190 chgp->p_nice = n; 191 (void)resetpriority(chgp); 192 return (0); 193 } 194 195 #if defined(COMPAT_43) || defined(COMPAT_SUNOS) || defined(COMPAT_SVR4) 196 /* ARGSUSED */ 197 compat_43_setrlimit(p, uap, retval) 198 struct proc *p; 199 struct compat_43_setrlimit_args /* { 200 syscallarg(u_int) which; 201 syscallarg(struct ogetrlimit *) rlp; 202 } */ *uap; 203 register_t *retval; 204 { 205 struct orlimit olim; 206 struct rlimit lim; 207 int error; 208 209 if (error = copyin((caddr_t)SCARG(uap, rlp), (caddr_t)&olim, 210 sizeof (struct orlimit))) 211 return (error); 212 lim.rlim_cur = olim.rlim_cur; 213 lim.rlim_max = olim.rlim_max; 214 return (dosetrlimit(p, SCARG(uap, which), &lim)); 215 } 216 217 /* ARGSUSED */ 218 compat_43_getrlimit(p, uap, retval) 219 struct proc *p; 220 register struct compat_43_getrlimit_args /* { 221 syscallarg(u_int) which; 222 syscallarg(struct ogetrlimit *) rlp; 223 } */ *uap; 224 register_t *retval; 225 { 226 struct orlimit olim; 227 228 if (SCARG(uap, which) >= RLIM_NLIMITS) 229 return (EINVAL); 230 olim.rlim_cur = p->p_rlimit[SCARG(uap, which)].rlim_cur; 231 if (olim.rlim_cur == -1) 232 olim.rlim_cur = 0x7fffffff; 233 olim.rlim_max = p->p_rlimit[SCARG(uap, which)].rlim_max; 234 if (olim.rlim_max == -1) 235 olim.rlim_max = 0x7fffffff; 236 return (copyout((caddr_t)&olim, (caddr_t)SCARG(uap, rlp), 237 sizeof(olim))); 238 } 239 #endif /* COMPAT_43 || COMPAT_SUNOS || COMPAT_SVR4 */ 240 241 /* ARGSUSED */ 242 setrlimit(p, uap, retval) 243 struct proc *p; 244 register struct setrlimit_args /* { 245 syscallarg(u_int) which; 246 syscallarg(struct rlimit *) rlp; 247 } */ *uap; 248 register_t *retval; 249 { 250 struct rlimit alim; 251 int error; 252 253 if (error = copyin((caddr_t)SCARG(uap, rlp), (caddr_t)&alim, 254 sizeof (struct rlimit))) 255 return (error); 256 return (dosetrlimit(p, SCARG(uap, which), &alim)); 257 } 258 259 int 260 dosetrlimit(p, which, limp) 261 struct proc *p; 262 u_int which; 263 struct rlimit *limp; 264 { 265 register struct rlimit *alimp; 266 extern unsigned maxdmap, maxsmap; 267 int error; 268 269 if (which >= RLIM_NLIMITS) 270 return (EINVAL); 271 alimp = &p->p_rlimit[which]; 272 if (limp->rlim_cur > alimp->rlim_max || 273 limp->rlim_max > alimp->rlim_max) 274 if (error = suser(p->p_ucred, &p->p_acflag)) 275 return (error); 276 if (limp->rlim_cur > limp->rlim_max) 277 limp->rlim_cur = limp->rlim_max; 278 if (p->p_limit->p_refcnt > 1 && 279 (p->p_limit->p_lflags & PL_SHAREMOD) == 0) { 280 p->p_limit->p_refcnt--; 281 p->p_limit = limcopy(p->p_limit); 282 alimp = &p->p_rlimit[which]; 283 } 284 285 switch (which) { 286 287 case RLIMIT_DATA: 288 if (limp->rlim_cur > maxdmap) 289 limp->rlim_cur = maxdmap; 290 if (limp->rlim_max > maxdmap) 291 limp->rlim_max = maxdmap; 292 break; 293 294 case RLIMIT_STACK: 295 if (limp->rlim_cur > maxsmap) 296 limp->rlim_cur = maxsmap; 297 if (limp->rlim_max > maxsmap) 298 limp->rlim_max = maxsmap; 299 /* 300 * Stack is allocated to the max at exec time with only 301 * "rlim_cur" bytes accessible. If stack limit is going 302 * up make more accessible, if going down make inaccessible. 303 */ 304 if (limp->rlim_cur != alimp->rlim_cur) { 305 vm_offset_t addr; 306 vm_size_t size; 307 vm_prot_t prot; 308 309 if (limp->rlim_cur > alimp->rlim_cur) { 310 prot = VM_PROT_ALL; 311 size = limp->rlim_cur - alimp->rlim_cur; 312 addr = USRSTACK - limp->rlim_cur; 313 } else { 314 prot = VM_PROT_NONE; 315 size = alimp->rlim_cur - limp->rlim_cur; 316 addr = USRSTACK - alimp->rlim_cur; 317 } 318 addr = trunc_page(addr); 319 size = round_page(size); 320 (void) vm_map_protect(&p->p_vmspace->vm_map, 321 addr, addr+size, prot, FALSE); 322 } 323 break; 324 325 case RLIMIT_NOFILE: 326 if (limp->rlim_cur > maxfiles) 327 limp->rlim_cur = maxfiles; 328 if (limp->rlim_max > maxfiles) 329 limp->rlim_max = maxfiles; 330 break; 331 332 case RLIMIT_NPROC: 333 if (limp->rlim_cur > maxproc) 334 limp->rlim_cur = maxproc; 335 if (limp->rlim_max > maxproc) 336 limp->rlim_max = maxproc; 337 break; 338 } 339 *alimp = *limp; 340 return (0); 341 } 342 343 /* ARGSUSED */ 344 getrlimit(p, uap, retval) 345 struct proc *p; 346 register struct getrlimit_args /* { 347 syscallarg(u_int) which; 348 syscallarg(struct rlimit *) rlp; 349 } */ *uap; 350 register_t *retval; 351 { 352 353 if (SCARG(uap, which) >= RLIM_NLIMITS) 354 return (EINVAL); 355 return (copyout((caddr_t)&p->p_rlimit[SCARG(uap, which)], 356 (caddr_t)SCARG(uap, rlp), sizeof (struct rlimit))); 357 } 358 359 /* 360 * Transform the running time and tick information in proc p into user, 361 * system, and interrupt time usage. 362 */ 363 calcru(p, up, sp, ip) 364 register struct proc *p; 365 register struct timeval *up; 366 register struct timeval *sp; 367 register struct timeval *ip; 368 { 369 register u_quad_t u, st, ut, it, tot; 370 register u_long sec, usec; 371 register int s; 372 struct timeval tv; 373 374 s = splstatclock(); 375 st = p->p_sticks; 376 ut = p->p_uticks; 377 it = p->p_iticks; 378 splx(s); 379 380 tot = st + ut + it; 381 if (tot == 0) { 382 up->tv_sec = up->tv_usec = 0; 383 sp->tv_sec = sp->tv_usec = 0; 384 if (ip != NULL) 385 ip->tv_sec = ip->tv_usec = 0; 386 return; 387 } 388 389 sec = p->p_rtime.tv_sec; 390 usec = p->p_rtime.tv_usec; 391 if (p == curproc) { 392 /* 393 * Adjust for the current time slice. This is actually fairly 394 * important since the error here is on the order of a time 395 * quantum, which is much greater than the sampling error. 396 */ 397 microtime(&tv); 398 sec += tv.tv_sec - runtime.tv_sec; 399 usec += tv.tv_usec - runtime.tv_usec; 400 } 401 u = sec * 1000000 + usec; 402 st = (u * st) / tot; 403 sp->tv_sec = st / 1000000; 404 sp->tv_usec = st % 1000000; 405 ut = (u * ut) / tot; 406 up->tv_sec = ut / 1000000; 407 up->tv_usec = ut % 1000000; 408 if (ip != NULL) { 409 it = (u * it) / tot; 410 ip->tv_sec = it / 1000000; 411 ip->tv_usec = it % 1000000; 412 } 413 } 414 415 /* ARGSUSED */ 416 getrusage(p, uap, retval) 417 register struct proc *p; 418 register struct getrusage_args /* { 419 syscallarg(int) who; 420 syscallarg(struct rusage *) rusage; 421 } */ *uap; 422 register_t *retval; 423 { 424 register struct rusage *rup; 425 426 switch (SCARG(uap, who)) { 427 428 case RUSAGE_SELF: 429 rup = &p->p_stats->p_ru; 430 calcru(p, &rup->ru_utime, &rup->ru_stime, NULL); 431 break; 432 433 case RUSAGE_CHILDREN: 434 rup = &p->p_stats->p_cru; 435 break; 436 437 default: 438 return (EINVAL); 439 } 440 return (copyout((caddr_t)rup, (caddr_t)SCARG(uap, rusage), 441 sizeof (struct rusage))); 442 } 443 444 ruadd(ru, ru2) 445 register struct rusage *ru, *ru2; 446 { 447 register long *ip, *ip2; 448 register int i; 449 450 timevaladd(&ru->ru_utime, &ru2->ru_utime); 451 timevaladd(&ru->ru_stime, &ru2->ru_stime); 452 if (ru->ru_maxrss < ru2->ru_maxrss) 453 ru->ru_maxrss = ru2->ru_maxrss; 454 ip = &ru->ru_first; ip2 = &ru2->ru_first; 455 for (i = &ru->ru_last - &ru->ru_first; i >= 0; i--) 456 *ip++ += *ip2++; 457 } 458 459 /* 460 * Make a copy of the plimit structure. 461 * We share these structures copy-on-write after fork, 462 * and copy when a limit is changed. 463 */ 464 struct plimit * 465 limcopy(lim) 466 struct plimit *lim; 467 { 468 register struct plimit *copy; 469 470 MALLOC(copy, struct plimit *, sizeof(struct plimit), 471 M_SUBPROC, M_WAITOK); 472 bcopy(lim->pl_rlimit, copy->pl_rlimit, 473 sizeof(struct rlimit) * RLIM_NLIMITS); 474 copy->p_lflags = 0; 475 copy->p_refcnt = 1; 476 return (copy); 477 } 478
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