kern_resource.c revision 1.79
1 /* $NetBSD: kern_resource.c,v 1.79 2004/04/17 15:15:29 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. Neither the name of the University nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 * 36 * @(#)kern_resource.c 8.8 (Berkeley) 2/14/95 37 */ 38 39 #include <sys/cdefs.h> 40 __KERNEL_RCSID(0, "$NetBSD: kern_resource.c,v 1.79 2004/04/17 15:15:29 christos Exp $"); 41 42 #include <sys/param.h> 43 #include <sys/systm.h> 44 #include <sys/kernel.h> 45 #include <sys/file.h> 46 #include <sys/resourcevar.h> 47 #include <sys/malloc.h> 48 #include <sys/pool.h> 49 #include <sys/proc.h> 50 #include <sys/sysctl.h> 51 52 #include <sys/mount.h> 53 #include <sys/sa.h> 54 #include <sys/syscallargs.h> 55 56 #include <uvm/uvm_extern.h> 57 58 /* 59 * Maximum process data and stack limits. 60 * They are variables so they are patchable. 61 */ 62 rlim_t maxdmap = MAXDSIZ; 63 rlim_t maxsmap = MAXSSIZ; 64 65 static struct uidinfo *getuidinfo(uid_t); 66 static void freeuidinfo(struct uidinfo *); 67 static struct uidinfo *allocuidinfo(uid_t); 68 69 /* 70 * Resource controls and accounting. 71 */ 72 73 int 74 sys_getpriority(l, v, retval) 75 struct lwp *l; 76 void *v; 77 register_t *retval; 78 { 79 struct sys_getpriority_args /* { 80 syscallarg(int) which; 81 syscallarg(int) who; 82 } */ *uap = v; 83 struct proc *curp = l->l_proc, *p; 84 int low = NZERO + PRIO_MAX + 1; 85 86 switch (SCARG(uap, which)) { 87 88 case PRIO_PROCESS: 89 if (SCARG(uap, who) == 0) 90 p = curp; 91 else 92 p = pfind(SCARG(uap, who)); 93 if (p == 0) 94 break; 95 low = p->p_nice; 96 break; 97 98 case PRIO_PGRP: { 99 struct pgrp *pg; 100 101 if (SCARG(uap, who) == 0) 102 pg = curp->p_pgrp; 103 else if ((pg = pgfind(SCARG(uap, who))) == NULL) 104 break; 105 LIST_FOREACH(p, &pg->pg_members, p_pglist) { 106 if (p->p_nice < low) 107 low = p->p_nice; 108 } 109 break; 110 } 111 112 case PRIO_USER: 113 if (SCARG(uap, who) == 0) 114 SCARG(uap, who) = curp->p_ucred->cr_uid; 115 proclist_lock_read(); 116 LIST_FOREACH(p, &allproc, p_list) { 117 if (p->p_ucred->cr_uid == (uid_t) SCARG(uap, who) && 118 p->p_nice < low) 119 low = p->p_nice; 120 } 121 proclist_unlock_read(); 122 break; 123 124 default: 125 return (EINVAL); 126 } 127 if (low == NZERO + PRIO_MAX + 1) 128 return (ESRCH); 129 *retval = low - NZERO; 130 return (0); 131 } 132 133 /* ARGSUSED */ 134 int 135 sys_setpriority(l, v, retval) 136 struct lwp *l; 137 void *v; 138 register_t *retval; 139 { 140 struct sys_setpriority_args /* { 141 syscallarg(int) which; 142 syscallarg(int) who; 143 syscallarg(int) prio; 144 } */ *uap = v; 145 struct proc *curp = l->l_proc, *p; 146 int found = 0, error = 0; 147 148 switch (SCARG(uap, which)) { 149 150 case PRIO_PROCESS: 151 if (SCARG(uap, who) == 0) 152 p = curp; 153 else 154 p = pfind(SCARG(uap, who)); 155 if (p == 0) 156 break; 157 error = donice(curp, p, SCARG(uap, prio)); 158 found++; 159 break; 160 161 case PRIO_PGRP: { 162 struct pgrp *pg; 163 164 if (SCARG(uap, who) == 0) 165 pg = curp->p_pgrp; 166 else if ((pg = pgfind(SCARG(uap, who))) == NULL) 167 break; 168 LIST_FOREACH(p, &pg->pg_members, p_pglist) { 169 error = donice(curp, p, SCARG(uap, prio)); 170 found++; 171 } 172 break; 173 } 174 175 case PRIO_USER: 176 if (SCARG(uap, who) == 0) 177 SCARG(uap, who) = curp->p_ucred->cr_uid; 178 proclist_lock_read(); 179 LIST_FOREACH(p, &allproc, p_list) { 180 if (p->p_ucred->cr_uid == (uid_t) SCARG(uap, who)) { 181 error = donice(curp, p, SCARG(uap, prio)); 182 found++; 183 } 184 } 185 proclist_unlock_read(); 186 break; 187 188 default: 189 return (EINVAL); 190 } 191 if (found == 0) 192 return (ESRCH); 193 return (error); 194 } 195 196 int 197 donice(curp, chgp, n) 198 struct proc *curp, *chgp; 199 int n; 200 { 201 struct pcred *pcred = curp->p_cred; 202 int s; 203 204 if (pcred->pc_ucred->cr_uid && pcred->p_ruid && 205 pcred->pc_ucred->cr_uid != chgp->p_ucred->cr_uid && 206 pcred->p_ruid != chgp->p_ucred->cr_uid) 207 return (EPERM); 208 if (n > PRIO_MAX) 209 n = PRIO_MAX; 210 if (n < PRIO_MIN) 211 n = PRIO_MIN; 212 n += NZERO; 213 if (n < chgp->p_nice && suser(pcred->pc_ucred, &curp->p_acflag)) 214 return (EACCES); 215 chgp->p_nice = n; 216 SCHED_LOCK(s); 217 (void)resetprocpriority(chgp); 218 SCHED_UNLOCK(s); 219 return (0); 220 } 221 222 /* ARGSUSED */ 223 int 224 sys_setrlimit(l, v, retval) 225 struct lwp *l; 226 void *v; 227 register_t *retval; 228 { 229 struct sys_setrlimit_args /* { 230 syscallarg(int) which; 231 syscallarg(const struct rlimit *) rlp; 232 } */ *uap = v; 233 struct proc *p = l->l_proc; 234 int which = SCARG(uap, which); 235 struct rlimit alim; 236 int error; 237 238 error = copyin(SCARG(uap, rlp), &alim, sizeof(struct rlimit)); 239 if (error) 240 return (error); 241 return (dosetrlimit(p, p->p_cred, which, &alim)); 242 } 243 244 int 245 dosetrlimit(p, cred, which, limp) 246 struct proc *p; 247 struct pcred *cred; 248 int which; 249 struct rlimit *limp; 250 { 251 struct rlimit *alimp; 252 struct plimit *newplim; 253 int error; 254 255 if ((u_int)which >= RLIM_NLIMITS) 256 return (EINVAL); 257 258 if (limp->rlim_cur < 0 || limp->rlim_max < 0) 259 return (EINVAL); 260 261 alimp = &p->p_rlimit[which]; 262 /* if we don't change the value, no need to limcopy() */ 263 if (limp->rlim_cur == alimp->rlim_cur && 264 limp->rlim_max == alimp->rlim_max) 265 return 0; 266 267 if (limp->rlim_cur > limp->rlim_max) { 268 /* 269 * This is programming error. According to SUSv2, we should 270 * return error in this case. 271 */ 272 return (EINVAL); 273 } 274 if (limp->rlim_max > alimp->rlim_max 275 && (error = suser(cred->pc_ucred, &p->p_acflag)) != 0) 276 return (error); 277 278 if (p->p_limit->p_refcnt > 1 && 279 (p->p_limit->p_lflags & PL_SHAREMOD) == 0) { 280 newplim = limcopy(p->p_limit); 281 limfree(p->p_limit); 282 p->p_limit = newplim; 283 alimp = &p->p_rlimit[which]; 284 } 285 286 switch (which) { 287 288 case RLIMIT_DATA: 289 if (limp->rlim_cur > maxdmap) 290 limp->rlim_cur = maxdmap; 291 if (limp->rlim_max > maxdmap) 292 limp->rlim_max = maxdmap; 293 break; 294 295 case RLIMIT_STACK: 296 if (limp->rlim_cur > maxsmap) 297 limp->rlim_cur = maxsmap; 298 if (limp->rlim_max > maxsmap) 299 limp->rlim_max = maxsmap; 300 301 /* 302 * Return EINVAL if the new stack size limit is lower than 303 * current usage. Otherwise, the process would get SIGSEGV the 304 * moment it would try to access anything on it's current stack. 305 * This conforms to SUSv2. 306 */ 307 if (limp->rlim_cur < p->p_vmspace->vm_ssize * PAGE_SIZE 308 || limp->rlim_max < p->p_vmspace->vm_ssize * PAGE_SIZE) 309 return (EINVAL); 310 311 /* 312 * Stack is allocated to the max at exec time with 313 * only "rlim_cur" bytes accessible (In other words, 314 * allocates stack dividing two contiguous regions at 315 * "rlim_cur" bytes boundary). 316 * 317 * Since allocation is done in terms of page, roundup 318 * "rlim_cur" (otherwise, contiguous regions 319 * overlap). If stack limit is going up make more 320 * accessible, if going down make inaccessible. 321 */ 322 limp->rlim_cur = round_page(limp->rlim_cur); 323 if (limp->rlim_cur != alimp->rlim_cur) { 324 vaddr_t addr; 325 vsize_t size; 326 vm_prot_t prot; 327 328 if (limp->rlim_cur > alimp->rlim_cur) { 329 prot = VM_PROT_READ | VM_PROT_WRITE; 330 size = limp->rlim_cur - alimp->rlim_cur; 331 addr = USRSTACK - limp->rlim_cur; 332 } else { 333 prot = VM_PROT_NONE; 334 size = alimp->rlim_cur - limp->rlim_cur; 335 addr = USRSTACK - alimp->rlim_cur; 336 } 337 (void) uvm_map_protect(&p->p_vmspace->vm_map, 338 addr, addr+size, prot, FALSE); 339 } 340 break; 341 342 case RLIMIT_NOFILE: 343 if (limp->rlim_cur > maxfiles) 344 limp->rlim_cur = maxfiles; 345 if (limp->rlim_max > maxfiles) 346 limp->rlim_max = maxfiles; 347 break; 348 349 case RLIMIT_NPROC: 350 if (limp->rlim_cur > maxproc) 351 limp->rlim_cur = maxproc; 352 if (limp->rlim_max > maxproc) 353 limp->rlim_max = maxproc; 354 break; 355 } 356 *alimp = *limp; 357 return (0); 358 } 359 360 /* ARGSUSED */ 361 int 362 sys_getrlimit(l, v, retval) 363 struct lwp *l; 364 void *v; 365 register_t *retval; 366 { 367 struct sys_getrlimit_args /* { 368 syscallarg(int) which; 369 syscallarg(struct rlimit *) rlp; 370 } */ *uap = v; 371 struct proc *p = l->l_proc; 372 int which = SCARG(uap, which); 373 374 if ((u_int)which >= RLIM_NLIMITS) 375 return (EINVAL); 376 return (copyout(&p->p_rlimit[which], SCARG(uap, rlp), 377 sizeof(struct rlimit))); 378 } 379 380 /* 381 * Transform the running time and tick information in proc p into user, 382 * system, and interrupt time usage. 383 */ 384 void 385 calcru(p, up, sp, ip) 386 struct proc *p; 387 struct timeval *up; 388 struct timeval *sp; 389 struct timeval *ip; 390 { 391 u_quad_t u, st, ut, it, tot; 392 unsigned long sec; 393 long usec; 394 int s; 395 struct timeval tv; 396 struct lwp *l; 397 398 s = splstatclock(); 399 st = p->p_sticks; 400 ut = p->p_uticks; 401 it = p->p_iticks; 402 splx(s); 403 404 sec = p->p_rtime.tv_sec; 405 usec = p->p_rtime.tv_usec; 406 LIST_FOREACH(l, &p->p_lwps, l_sibling) { 407 if (l->l_stat == LSONPROC) { 408 struct schedstate_percpu *spc; 409 410 KDASSERT(l->l_cpu != NULL); 411 spc = &l->l_cpu->ci_schedstate; 412 413 /* 414 * Adjust for the current time slice. This is 415 * actually fairly important since the error 416 * here is on the order of a time quantum, 417 * which is much greater than the sampling 418 * error. 419 */ 420 microtime(&tv); 421 sec += tv.tv_sec - spc->spc_runtime.tv_sec; 422 usec += tv.tv_usec - spc->spc_runtime.tv_usec; 423 } 424 } 425 426 tot = st + ut + it; 427 u = sec * 1000000ull + usec; 428 429 if (tot == 0) { 430 /* No ticks, so can't use to share time out, split 50-50 */ 431 st = ut = u / 2; 432 } else { 433 st = (u * st) / tot; 434 ut = (u * ut) / tot; 435 } 436 sp->tv_sec = st / 1000000; 437 sp->tv_usec = st % 1000000; 438 up->tv_sec = ut / 1000000; 439 up->tv_usec = ut % 1000000; 440 if (ip != NULL) { 441 if (it != 0) 442 it = (u * it) / tot; 443 ip->tv_sec = it / 1000000; 444 ip->tv_usec = it % 1000000; 445 } 446 } 447 448 /* ARGSUSED */ 449 int 450 sys_getrusage(l, v, retval) 451 struct lwp *l; 452 void *v; 453 register_t *retval; 454 { 455 struct sys_getrusage_args /* { 456 syscallarg(int) who; 457 syscallarg(struct rusage *) rusage; 458 } */ *uap = v; 459 struct rusage *rup; 460 struct proc *p = l->l_proc; 461 462 switch (SCARG(uap, who)) { 463 464 case RUSAGE_SELF: 465 rup = &p->p_stats->p_ru; 466 calcru(p, &rup->ru_utime, &rup->ru_stime, NULL); 467 break; 468 469 case RUSAGE_CHILDREN: 470 rup = &p->p_stats->p_cru; 471 break; 472 473 default: 474 return (EINVAL); 475 } 476 return (copyout(rup, SCARG(uap, rusage), sizeof(struct rusage))); 477 } 478 479 void 480 ruadd(ru, ru2) 481 struct rusage *ru, *ru2; 482 { 483 long *ip, *ip2; 484 int i; 485 486 timeradd(&ru->ru_utime, &ru2->ru_utime, &ru->ru_utime); 487 timeradd(&ru->ru_stime, &ru2->ru_stime, &ru->ru_stime); 488 if (ru->ru_maxrss < ru2->ru_maxrss) 489 ru->ru_maxrss = ru2->ru_maxrss; 490 ip = &ru->ru_first; ip2 = &ru2->ru_first; 491 for (i = &ru->ru_last - &ru->ru_first; i >= 0; i--) 492 *ip++ += *ip2++; 493 } 494 495 /* 496 * Make a copy of the plimit structure. 497 * We share these structures copy-on-write after fork, 498 * and copy when a limit is changed. 499 */ 500 struct plimit * 501 limcopy(lim) 502 struct plimit *lim; 503 { 504 struct plimit *newlim; 505 size_t l; 506 507 newlim = pool_get(&plimit_pool, PR_WAITOK); 508 memcpy(newlim->pl_rlimit, lim->pl_rlimit, 509 sizeof(struct rlimit) * RLIM_NLIMITS); 510 if (lim->pl_corename == defcorename) { 511 newlim->pl_corename = defcorename; 512 } else { 513 l = strlen(lim->pl_corename) + 1; 514 newlim->pl_corename = malloc(l, M_TEMP, M_WAITOK); 515 strlcpy(newlim->pl_corename, lim->pl_corename, l); 516 } 517 newlim->p_lflags = 0; 518 newlim->p_refcnt = 1; 519 return (newlim); 520 } 521 522 void 523 limfree(lim) 524 struct plimit *lim; 525 { 526 527 if (--lim->p_refcnt > 0) 528 return; 529 #ifdef DIAGNOSTIC 530 if (lim->p_refcnt < 0) 531 panic("limfree"); 532 #endif 533 if (lim->pl_corename != defcorename) 534 free(lim->pl_corename, M_TEMP); 535 pool_put(&plimit_pool, lim); 536 } 537 538 struct pstats * 539 pstatscopy(ps) 540 struct pstats *ps; 541 { 542 543 struct pstats *newps; 544 545 newps = pool_get(&pstats_pool, PR_WAITOK); 546 547 memset(&newps->pstat_startzero, 0, 548 (unsigned) ((caddr_t)&newps->pstat_endzero - 549 (caddr_t)&newps->pstat_startzero)); 550 memcpy(&newps->pstat_startcopy, &ps->pstat_startcopy, 551 ((caddr_t)&newps->pstat_endcopy - 552 (caddr_t)&newps->pstat_startcopy)); 553 554 return (newps); 555 556 } 557 558 void 559 pstatsfree(ps) 560 struct pstats *ps; 561 { 562 563 pool_put(&pstats_pool, ps); 564 } 565 566 /* 567 * sysctl interface in five parts 568 */ 569 570 /* 571 * a routine for sysctl proc subtree helpers that need to pick a valid 572 * process by pid. 573 */ 574 static int 575 sysctl_proc_findproc(struct proc *p, struct proc **p2, pid_t pid) 576 { 577 struct proc *ptmp; 578 int i, error = 0; 579 580 if (pid == PROC_CURPROC) 581 ptmp = p; 582 else if ((ptmp = pfind(pid)) == NULL) 583 error = ESRCH; 584 else { 585 /* 586 * suid proc of ours or proc not ours 587 */ 588 if (p->p_cred->p_ruid != ptmp->p_cred->p_ruid || 589 p->p_cred->p_ruid != ptmp->p_cred->p_svuid) 590 error = suser(p->p_ucred, &p->p_acflag); 591 592 /* 593 * sgid proc has sgid back to us temporarily 594 */ 595 else if (ptmp->p_cred->p_rgid != ptmp->p_cred->p_svgid) 596 error = suser(p->p_ucred, &p->p_acflag); 597 598 /* 599 * our rgid must be in target's group list (ie, 600 * sub-processes started by a sgid process) 601 */ 602 else { 603 for (i = 0; i < p->p_ucred->cr_ngroups; i++) { 604 if (p->p_ucred->cr_groups[i] == 605 ptmp->p_cred->p_rgid) 606 break; 607 } 608 if (i == p->p_ucred->cr_ngroups) 609 error = suser(p->p_ucred, &p->p_acflag); 610 } 611 } 612 613 *p2 = ptmp; 614 return (error); 615 } 616 617 /* 618 * sysctl helper routine for setting a process's specific corefile 619 * name. picks the process based on the given pid and checks the 620 * correctness of the new value. 621 */ 622 static int 623 sysctl_proc_corename(SYSCTLFN_ARGS) 624 { 625 struct proc *ptmp, *p; 626 struct plimit *newplim; 627 int error = 0, len; 628 char cname[MAXPATHLEN], *tmp; 629 struct sysctlnode node; 630 631 /* 632 * is this all correct? 633 */ 634 if (namelen != 0) 635 return (EINVAL); 636 if (name[-1] != PROC_PID_CORENAME) 637 return (EINVAL); 638 639 /* 640 * whom are we tweaking? 641 */ 642 p = l->l_proc; 643 error = sysctl_proc_findproc(p, &ptmp, (pid_t)name[-2]); 644 if (error) 645 return (error); 646 647 /* 648 * let them modify a temporary copy of the core name 649 */ 650 node = *rnode; 651 strlcpy(cname, ptmp->p_limit->pl_corename, sizeof(cname)); 652 node.sysctl_data = cname; 653 error = sysctl_lookup(SYSCTLFN_CALL(&node)); 654 655 /* 656 * if that failed, or they have nothing new to say, or we've 657 * heard it before... 658 */ 659 if (error || newp == NULL || 660 strcmp(cname, ptmp->p_limit->pl_corename) == 0) 661 return (error); 662 663 /* 664 * no error yet and cname now has the new core name in it. 665 * let's see if it looks acceptable. it must be either "core" 666 * or end in ".core" or "/core". 667 */ 668 len = strlen(cname); 669 if (len < 4) 670 return (EINVAL); 671 if (strcmp(cname + len - 4, "core") != 0) 672 return (EINVAL); 673 if (len > 4 && cname[len - 5] != '/' && cname[len - 5] != '.') 674 return (EINVAL); 675 676 /* 677 * hmm...looks good. now...where do we put it? 678 */ 679 tmp = malloc(len + 1, M_TEMP, M_WAITOK|M_CANFAIL); 680 if (tmp == NULL) 681 return (ENOMEM); 682 strlcpy(tmp, cname, len + 1); 683 684 if (ptmp->p_limit->p_refcnt > 1 && 685 (ptmp->p_limit->p_lflags & PL_SHAREMOD) == 0) { 686 newplim = limcopy(ptmp->p_limit); 687 limfree(ptmp->p_limit); 688 ptmp->p_limit = newplim; 689 } 690 if (ptmp->p_limit->pl_corename != defcorename) 691 FREE(ptmp->p_limit->pl_corename, M_SYSCTLDATA); 692 ptmp->p_limit->pl_corename = tmp; 693 694 return (error); 695 } 696 697 /* 698 * sysctl helper routine for checking/setting a process's stop flags, 699 * one for fork and one for exec. 700 */ 701 static int 702 sysctl_proc_stop(SYSCTLFN_ARGS) 703 { 704 struct proc *p, *ptmp; 705 int i, f, error = 0; 706 struct sysctlnode node; 707 708 if (namelen != 0) 709 return (EINVAL); 710 711 p = l->l_proc; 712 error = sysctl_proc_findproc(p, &ptmp, (pid_t)name[-2]); 713 if (error) 714 return (error); 715 716 switch (rnode->sysctl_num) { 717 case PROC_PID_STOPFORK: 718 f = P_STOPFORK; 719 break; 720 case PROC_PID_STOPEXEC: 721 f = P_STOPEXEC; 722 break; 723 case PROC_PID_STOPEXIT: 724 f = P_STOPEXIT; 725 break; 726 default: 727 return (EINVAL); 728 } 729 730 i = (ptmp->p_flag & f) ? 1 : 0; 731 node = *rnode; 732 node.sysctl_data = &i; 733 error = sysctl_lookup(SYSCTLFN_CALL(&node)); 734 if (error || newp == NULL) 735 return (error); 736 737 if (i) 738 ptmp->p_flag |= f; 739 else 740 ptmp->p_flag &= ~f; 741 742 return (0); 743 } 744 745 /* 746 * sysctl helper routine for a process's rlimits as exposed by sysctl. 747 */ 748 static int 749 sysctl_proc_plimit(SYSCTLFN_ARGS) 750 { 751 struct proc *ptmp, *p; 752 u_int limitno; 753 int which, error = 0; 754 struct rlimit alim; 755 struct sysctlnode node; 756 757 if (namelen != 0) 758 return (EINVAL); 759 760 which = name[-1]; 761 if (which != PROC_PID_LIMIT_TYPE_SOFT && 762 which != PROC_PID_LIMIT_TYPE_HARD) 763 return (EINVAL); 764 765 limitno = name[-2] - 1; 766 if (limitno >= RLIM_NLIMITS) 767 return (EINVAL); 768 769 if (name[-3] != PROC_PID_LIMIT) 770 return (EINVAL); 771 772 p = l->l_proc; 773 error = sysctl_proc_findproc(p, &ptmp, (pid_t)name[-4]); 774 if (error) 775 return (error); 776 777 node = *rnode; 778 memcpy(&alim, &ptmp->p_rlimit[limitno], sizeof(alim)); 779 if (which == PROC_PID_LIMIT_TYPE_HARD) 780 node.sysctl_data = &alim.rlim_max; 781 else 782 node.sysctl_data = &alim.rlim_cur; 783 784 error = sysctl_lookup(SYSCTLFN_CALL(&node)); 785 if (error || newp == NULL) 786 return (error); 787 788 return (dosetrlimit(ptmp, p->p_cred, limitno, &alim)); 789 } 790 791 /* 792 * and finally, the actually glue that sticks it to the tree 793 */ 794 SYSCTL_SETUP(sysctl_proc_setup, "sysctl proc subtree setup") 795 { 796 797 sysctl_createv(clog, 0, NULL, NULL, 798 CTLFLAG_PERMANENT, 799 CTLTYPE_NODE, "proc", NULL, 800 NULL, 0, NULL, 0, 801 CTL_PROC, CTL_EOL); 802 sysctl_createv(clog, 0, NULL, NULL, 803 CTLFLAG_PERMANENT|CTLFLAG_ANYNUMBER, 804 CTLTYPE_NODE, "curproc", 805 SYSCTL_DESCR("Per-process settings"), 806 NULL, 0, NULL, 0, 807 CTL_PROC, PROC_CURPROC, CTL_EOL); 808 809 sysctl_createv(clog, 0, NULL, NULL, 810 CTLFLAG_PERMANENT|CTLFLAG_READONLY2|CTLFLAG_ANYWRITE, 811 CTLTYPE_STRING, "corename", 812 SYSCTL_DESCR("Core file name"), 813 sysctl_proc_corename, 0, NULL, MAXPATHLEN, 814 CTL_PROC, PROC_CURPROC, PROC_PID_CORENAME, CTL_EOL); 815 sysctl_createv(clog, 0, NULL, NULL, 816 CTLFLAG_PERMANENT, 817 CTLTYPE_NODE, "rlimit", 818 SYSCTL_DESCR("Process limits"), 819 NULL, 0, NULL, 0, 820 CTL_PROC, PROC_CURPROC, PROC_PID_LIMIT, CTL_EOL); 821 822 #define create_proc_plimit(s, n) do { \ 823 sysctl_createv(clog, 0, NULL, NULL, \ 824 CTLFLAG_PERMANENT, \ 825 CTLTYPE_NODE, s, \ 826 SYSCTL_DESCR("Process " s " limits"), \ 827 NULL, 0, NULL, 0, \ 828 CTL_PROC, PROC_CURPROC, PROC_PID_LIMIT, n, \ 829 CTL_EOL); \ 830 sysctl_createv(clog, 0, NULL, NULL, \ 831 CTLFLAG_PERMANENT|CTLFLAG_READWRITE|CTLFLAG_ANYWRITE, \ 832 CTLTYPE_QUAD, "soft", \ 833 SYSCTL_DESCR("Process soft " s " limit"), \ 834 sysctl_proc_plimit, 0, NULL, 0, \ 835 CTL_PROC, PROC_CURPROC, PROC_PID_LIMIT, n, \ 836 PROC_PID_LIMIT_TYPE_SOFT, CTL_EOL); \ 837 sysctl_createv(clog, 0, NULL, NULL, \ 838 CTLFLAG_PERMANENT|CTLFLAG_READWRITE|CTLFLAG_ANYWRITE, \ 839 CTLTYPE_QUAD, "hard", \ 840 SYSCTL_DESCR("Process hard " s " limit"), \ 841 sysctl_proc_plimit, 0, NULL, 0, \ 842 CTL_PROC, PROC_CURPROC, PROC_PID_LIMIT, n, \ 843 PROC_PID_LIMIT_TYPE_HARD, CTL_EOL); \ 844 } while (0/*CONSTCOND*/) 845 846 create_proc_plimit("cputime", PROC_PID_LIMIT_CPU); 847 create_proc_plimit("filesize", PROC_PID_LIMIT_FSIZE); 848 create_proc_plimit("datasize", PROC_PID_LIMIT_DATA); 849 create_proc_plimit("stacksize", PROC_PID_LIMIT_STACK); 850 create_proc_plimit("coredumpsize", PROC_PID_LIMIT_CORE); 851 create_proc_plimit("memoryuse", PROC_PID_LIMIT_RSS); 852 create_proc_plimit("memorylocked", PROC_PID_LIMIT_MEMLOCK); 853 create_proc_plimit("maxproc", PROC_PID_LIMIT_NPROC); 854 create_proc_plimit("descriptors", PROC_PID_LIMIT_NOFILE); 855 create_proc_plimit("sbsize", PROC_PID_LIMIT_SBSIZE); 856 857 #undef create_proc_plimit 858 859 sysctl_createv(clog, 0, NULL, NULL, 860 CTLFLAG_PERMANENT|CTLFLAG_READWRITE|CTLFLAG_ANYWRITE, 861 CTLTYPE_INT, "stopfork", 862 SYSCTL_DESCR("Stop process at fork(2)"), 863 sysctl_proc_stop, 0, NULL, 0, 864 CTL_PROC, PROC_CURPROC, PROC_PID_STOPFORK, CTL_EOL); 865 sysctl_createv(clog, 0, NULL, NULL, 866 CTLFLAG_PERMANENT|CTLFLAG_READWRITE|CTLFLAG_ANYWRITE, 867 CTLTYPE_INT, "stopexec", 868 SYSCTL_DESCR("Stop process at execve(2)"), 869 sysctl_proc_stop, 0, NULL, 0, 870 CTL_PROC, PROC_CURPROC, PROC_PID_STOPEXEC, CTL_EOL); 871 sysctl_createv(clog, 0, NULL, NULL, 872 CTLFLAG_PERMANENT|CTLFLAG_READWRITE|CTLFLAG_ANYWRITE, 873 CTLTYPE_INT, "stopexit", 874 SYSCTL_DESCR("Stop process before completing exit"), 875 sysctl_proc_stop, 0, NULL, 0, 876 CTL_PROC, PROC_CURPROC, PROC_PID_STOPEXIT, CTL_EOL); 877 } 878 879 static struct uidinfo * 880 getuidinfo(uid_t uid) 881 { 882 struct uidinfo *uip; 883 struct uihashhead *uipp; 884 885 uipp = UIHASH(uid); 886 887 LIST_FOREACH(uip, uipp, ui_hash) 888 if (uip->ui_uid == uid) 889 return uip; 890 return NULL; 891 } 892 893 static void 894 freeuidinfo(struct uidinfo *uip) 895 { 896 LIST_REMOVE(uip, ui_hash); 897 FREE(uip, M_PROC); 898 } 899 900 static struct uidinfo * 901 allocuidinfo(uid_t uid) 902 { 903 struct uidinfo *uip; 904 struct uihashhead *uipp; 905 906 uipp = UIHASH(uid); 907 MALLOC(uip, struct uidinfo *, sizeof(*uip), M_PROC, M_WAITOK); 908 LIST_INSERT_HEAD(uipp, uip, ui_hash); 909 uip->ui_uid = uid; 910 uip->ui_proccnt = 0; 911 uip->ui_sbsize = 0; 912 return uip; 913 } 914 915 /* 916 * Change the count associated with number of processes 917 * a given user is using. 918 */ 919 int 920 chgproccnt(uid_t uid, int diff) 921 { 922 struct uidinfo *uip; 923 924 if (diff == 0) 925 return 0; 926 927 if ((uip = getuidinfo(uid)) != NULL) { 928 uip->ui_proccnt += diff; 929 KASSERT(uip->ui_proccnt >= 0); 930 if (uip->ui_proccnt > 0) 931 return uip->ui_proccnt; 932 else { 933 if (uip->ui_sbsize == 0) 934 freeuidinfo(uip); 935 return 0; 936 } 937 } else { 938 if (diff < 0) 939 panic("chgproccnt: lost user %lu", (unsigned long)uid); 940 uip = allocuidinfo(uid); 941 uip->ui_proccnt = diff; 942 return uip->ui_proccnt; 943 } 944 } 945 946 int 947 chgsbsize(uid_t uid, u_long *hiwat, u_long to, rlim_t max) 948 { 949 struct uidinfo *uip; 950 rlim_t nsb; 951 int rv = 0; 952 953 if ((uip = getuidinfo(uid)) == NULL) 954 uip = allocuidinfo(uid); 955 nsb = uip->ui_sbsize + to + *hiwat; 956 if (nsb > *hiwat && nsb > max) 957 goto done; 958 *hiwat = to; 959 uip->ui_sbsize = nsb; 960 rv = 1; 961 KASSERT(uip->ui_sbsize >= 0); 962 done: 963 if (uip->ui_sbsize == 0 && uip->ui_proccnt == 0) 964 freeuidinfo(uip); 965 return rv; 966 } 967
Indexes created Sun Sep 21 19:09:51 GMT 2025