kern_resource.c revision 1.113.2.2
1 /* $NetBSD: kern_resource.c,v 1.113.2.2 2007/02/27 16:54:24 yamt 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 1.113.2.2 2007/02/27 16:54:24 yamt 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/namei.h> 49 #include <sys/pool.h> 50 #include <sys/proc.h> 51 #include <sys/sysctl.h> 52 #include <sys/kauth.h> 53 54 #include <sys/mount.h> 55 #include <sys/syscallargs.h> 56 57 #include <uvm/uvm_extern.h> 58 59 /* 60 * Maximum process data and stack limits. 61 * They are variables so they are patchable. 62 */ 63 rlim_t maxdmap = MAXDSIZ; 64 rlim_t maxsmap = MAXSSIZ; 65 66 struct uihashhead *uihashtbl; 67 u_long uihash; /* size of hash table - 1 */ 68 struct simplelock uihashtbl_slock = SIMPLELOCK_INITIALIZER; 69 70 71 /* 72 * Resource controls and accounting. 73 */ 74 75 int 76 sys_getpriority(struct lwp *l, void *v, register_t *retval) 77 { 78 struct sys_getpriority_args /* { 79 syscallarg(int) which; 80 syscallarg(id_t) who; 81 } */ *uap = v; 82 struct proc *curp = l->l_proc, *p; 83 int low = NZERO + PRIO_MAX + 1; 84 int who = SCARG(uap, who); 85 86 rw_enter(&proclist_lock, RW_READER); 87 switch (SCARG(uap, which)) { 88 case PRIO_PROCESS: 89 if (who == 0) 90 p = curp; 91 else 92 p = p_find(who, PFIND_LOCKED); 93 if (p != NULL) 94 low = p->p_nice; 95 break; 96 97 case PRIO_PGRP: { 98 struct pgrp *pg; 99 100 if (who == 0) 101 pg = curp->p_pgrp; 102 else if ((pg = pg_find(who, PFIND_LOCKED)) == NULL) 103 break; 104 LIST_FOREACH(p, &pg->pg_members, p_pglist) { 105 if (p->p_nice < low) 106 low = p->p_nice; 107 } 108 break; 109 } 110 111 case PRIO_USER: 112 if (who == 0) 113 who = (int)kauth_cred_geteuid(l->l_cred); 114 PROCLIST_FOREACH(p, &allproc) { 115 mutex_enter(&p->p_mutex); 116 if (kauth_cred_geteuid(p->p_cred) == 117 (uid_t)who && p->p_nice < low) 118 low = p->p_nice; 119 mutex_exit(&p->p_mutex); 120 } 121 break; 122 123 default: 124 rw_exit(&proclist_lock); 125 return (EINVAL); 126 } 127 rw_exit(&proclist_lock); 128 129 if (low == NZERO + PRIO_MAX + 1) 130 return (ESRCH); 131 *retval = low - NZERO; 132 return (0); 133 } 134 135 /* ARGSUSED */ 136 int 137 sys_setpriority(struct lwp *l, void *v, register_t *retval) 138 { 139 struct sys_setpriority_args /* { 140 syscallarg(int) which; 141 syscallarg(id_t) who; 142 syscallarg(int) prio; 143 } */ *uap = v; 144 struct proc *curp = l->l_proc, *p; 145 int found = 0, error = 0; 146 int who = SCARG(uap, who); 147 148 rw_enter(&proclist_lock, RW_READER); 149 switch (SCARG(uap, which)) { 150 case PRIO_PROCESS: 151 if (who == 0) 152 p = curp; 153 else 154 p = p_find(who, PFIND_LOCKED); 155 if (p != 0) { 156 mutex_enter(&p->p_mutex); 157 error = donice(l, p, SCARG(uap, prio)); 158 mutex_exit(&p->p_mutex); 159 } 160 found++; 161 break; 162 163 case PRIO_PGRP: { 164 struct pgrp *pg; 165 166 if (who == 0) 167 pg = curp->p_pgrp; 168 else if ((pg = pg_find(who, PFIND_LOCKED)) == NULL) 169 break; 170 LIST_FOREACH(p, &pg->pg_members, p_pglist) { 171 mutex_enter(&p->p_mutex); 172 error = donice(l, p, SCARG(uap, prio)); 173 mutex_exit(&p->p_mutex); 174 found++; 175 } 176 break; 177 } 178 179 case PRIO_USER: 180 if (who == 0) 181 who = (int)kauth_cred_geteuid(l->l_cred); 182 PROCLIST_FOREACH(p, &allproc) { 183 mutex_enter(&p->p_mutex); 184 if (kauth_cred_geteuid(p->p_cred) == 185 (uid_t)SCARG(uap, who)) { 186 error = donice(l, p, SCARG(uap, prio)); 187 found++; 188 } 189 mutex_exit(&p->p_mutex); 190 } 191 break; 192 193 default: 194 error = EINVAL; 195 break; 196 } 197 rw_exit(&proclist_lock); 198 if (found == 0) 199 return (ESRCH); 200 return (error); 201 } 202 203 /* 204 * Renice a process. 205 * 206 * Call with the target process' credentials locked. 207 */ 208 int 209 donice(struct lwp *l, struct proc *chgp, int n) 210 { 211 kauth_cred_t cred = l->l_cred; 212 int onice; 213 214 LOCK_ASSERT(mutex_owned(&chgp->p_mutex)); 215 216 if (n > PRIO_MAX) 217 n = PRIO_MAX; 218 if (n < PRIO_MIN) 219 n = PRIO_MIN; 220 n += NZERO; 221 onice = chgp->p_nice; 222 onice = chgp->p_nice; 223 224 again: 225 if (kauth_authorize_process(cred, KAUTH_PROCESS_NICE, chgp, 226 KAUTH_ARG(n), NULL, NULL)) 227 return (EACCES); 228 mutex_spin_enter(&chgp->p_stmutex); 229 if (onice != chgp->p_nice) { 230 mutex_spin_exit(&chgp->p_stmutex); 231 goto again; 232 } 233 sched_nice(chgp, n); 234 mutex_spin_exit(&chgp->p_stmutex); 235 return (0); 236 } 237 238 /* ARGSUSED */ 239 int 240 sys_setrlimit(struct lwp *l, void *v, register_t *retval) 241 { 242 struct sys_setrlimit_args /* { 243 syscallarg(int) which; 244 syscallarg(const struct rlimit *) rlp; 245 } */ *uap = v; 246 int which = SCARG(uap, which); 247 struct rlimit alim; 248 int error; 249 250 error = copyin(SCARG(uap, rlp), &alim, sizeof(struct rlimit)); 251 if (error) 252 return (error); 253 return (dosetrlimit(l, l->l_proc, which, &alim)); 254 } 255 256 int 257 dosetrlimit(struct lwp *l, struct proc *p, int which, struct rlimit *limp) 258 { 259 struct rlimit *alimp; 260 struct plimit *oldplim; 261 int error; 262 263 if ((u_int)which >= RLIM_NLIMITS) 264 return (EINVAL); 265 266 if (limp->rlim_cur < 0 || limp->rlim_max < 0) 267 return (EINVAL); 268 269 alimp = &p->p_rlimit[which]; 270 /* if we don't change the value, no need to limcopy() */ 271 if (limp->rlim_cur == alimp->rlim_cur && 272 limp->rlim_max == alimp->rlim_max) 273 return 0; 274 275 if (limp->rlim_cur > limp->rlim_max) { 276 /* 277 * This is programming error. According to SUSv2, we should 278 * return error in this case. 279 */ 280 return (EINVAL); 281 } 282 error = kauth_authorize_process(l->l_cred, KAUTH_PROCESS_RLIMIT, 283 p, limp, KAUTH_ARG(which), NULL); 284 if (error) 285 return (error); 286 287 mutex_enter(&p->p_mutex); 288 if (p->p_limit->p_refcnt > 1 && 289 (p->p_limit->p_lflags & PL_SHAREMOD) == 0) { 290 oldplim = p->p_limit; 291 p->p_limit = limcopy(p); 292 limfree(oldplim); 293 alimp = &p->p_rlimit[which]; 294 } 295 296 switch (which) { 297 298 case RLIMIT_DATA: 299 if (limp->rlim_cur > maxdmap) 300 limp->rlim_cur = maxdmap; 301 if (limp->rlim_max > maxdmap) 302 limp->rlim_max = maxdmap; 303 break; 304 305 case RLIMIT_STACK: 306 if (limp->rlim_cur > maxsmap) 307 limp->rlim_cur = maxsmap; 308 if (limp->rlim_max > maxsmap) 309 limp->rlim_max = maxsmap; 310 311 /* 312 * Return EINVAL if the new stack size limit is lower than 313 * current usage. Otherwise, the process would get SIGSEGV the 314 * moment it would try to access anything on it's current stack. 315 * This conforms to SUSv2. 316 */ 317 if (limp->rlim_cur < p->p_vmspace->vm_ssize * PAGE_SIZE 318 || limp->rlim_max < p->p_vmspace->vm_ssize * PAGE_SIZE) { 319 mutex_exit(&p->p_mutex); 320 return (EINVAL); 321 } 322 323 /* 324 * Stack is allocated to the max at exec time with 325 * only "rlim_cur" bytes accessible (In other words, 326 * allocates stack dividing two contiguous regions at 327 * "rlim_cur" bytes boundary). 328 * 329 * Since allocation is done in terms of page, roundup 330 * "rlim_cur" (otherwise, contiguous regions 331 * overlap). If stack limit is going up make more 332 * accessible, if going down make inaccessible. 333 */ 334 limp->rlim_cur = round_page(limp->rlim_cur); 335 if (limp->rlim_cur != alimp->rlim_cur) { 336 vaddr_t addr; 337 vsize_t size; 338 vm_prot_t prot; 339 340 if (limp->rlim_cur > alimp->rlim_cur) { 341 prot = VM_PROT_READ | VM_PROT_WRITE; 342 size = limp->rlim_cur - alimp->rlim_cur; 343 addr = (vaddr_t)p->p_vmspace->vm_minsaddr - 344 limp->rlim_cur; 345 } else { 346 prot = VM_PROT_NONE; 347 size = alimp->rlim_cur - limp->rlim_cur; 348 addr = (vaddr_t)p->p_vmspace->vm_minsaddr - 349 alimp->rlim_cur; 350 } 351 (void) uvm_map_protect(&p->p_vmspace->vm_map, 352 addr, addr+size, prot, false); 353 } 354 break; 355 356 case RLIMIT_NOFILE: 357 if (limp->rlim_cur > maxfiles) 358 limp->rlim_cur = maxfiles; 359 if (limp->rlim_max > maxfiles) 360 limp->rlim_max = maxfiles; 361 break; 362 363 case RLIMIT_NPROC: 364 if (limp->rlim_cur > maxproc) 365 limp->rlim_cur = maxproc; 366 if (limp->rlim_max > maxproc) 367 limp->rlim_max = maxproc; 368 break; 369 } 370 *alimp = *limp; 371 mutex_exit(&p->p_mutex); 372 return (0); 373 } 374 375 /* ARGSUSED */ 376 int 377 sys_getrlimit(struct lwp *l, void *v, register_t *retval) 378 { 379 struct sys_getrlimit_args /* { 380 syscallarg(int) which; 381 syscallarg(struct rlimit *) rlp; 382 } */ *uap = v; 383 struct proc *p = l->l_proc; 384 int which = SCARG(uap, which); 385 386 if ((u_int)which >= RLIM_NLIMITS) 387 return (EINVAL); 388 return (copyout(&p->p_rlimit[which], SCARG(uap, rlp), 389 sizeof(struct rlimit))); 390 } 391 392 /* 393 * Transform the running time and tick information in proc p into user, 394 * system, and interrupt time usage. 395 * 396 * Should be called with p->p_smutex held unless called from exit1(). 397 */ 398 void 399 calcru(struct proc *p, struct timeval *up, struct timeval *sp, 400 struct timeval *ip, struct timeval *rp) 401 { 402 u_quad_t u, st, ut, it, tot; 403 unsigned long sec; 404 long usec; 405 struct timeval tv; 406 struct lwp *l; 407 408 mutex_spin_enter(&p->p_stmutex); 409 st = p->p_sticks; 410 ut = p->p_uticks; 411 it = p->p_iticks; 412 mutex_spin_exit(&p->p_stmutex); 413 414 sec = p->p_rtime.tv_sec; 415 usec = p->p_rtime.tv_usec; 416 417 LIST_FOREACH(l, &p->p_lwps, l_sibling) { 418 lwp_lock(l); 419 sec += l->l_rtime.tv_sec; 420 if ((usec += l->l_rtime.tv_usec) >= 1000000) { 421 sec++; 422 usec -= 1000000; 423 } 424 if (l->l_cpu == curcpu()) { 425 struct schedstate_percpu *spc; 426 427 KDASSERT(l->l_cpu != NULL); 428 spc = &l->l_cpu->ci_schedstate; 429 430 /* 431 * Adjust for the current time slice. This is 432 * actually fairly important since the error 433 * here is on the order of a time quantum, 434 * which is much greater than the sampling 435 * error. 436 */ 437 microtime(&tv); 438 sec += tv.tv_sec - spc->spc_runtime.tv_sec; 439 usec += tv.tv_usec - spc->spc_runtime.tv_usec; 440 if (usec >= 1000000) { 441 sec++; 442 usec -= 1000000; 443 } 444 } 445 lwp_unlock(l); 446 } 447 448 tot = st + ut + it; 449 u = sec * 1000000ull + usec; 450 451 if (tot == 0) { 452 /* No ticks, so can't use to share time out, split 50-50 */ 453 st = ut = u / 2; 454 } else { 455 st = (u * st) / tot; 456 ut = (u * ut) / tot; 457 } 458 if (sp != NULL) { 459 sp->tv_sec = st / 1000000; 460 sp->tv_usec = st % 1000000; 461 } 462 if (up != NULL) { 463 up->tv_sec = ut / 1000000; 464 up->tv_usec = ut % 1000000; 465 } 466 if (ip != NULL) { 467 if (it != 0) 468 it = (u * it) / tot; 469 ip->tv_sec = it / 1000000; 470 ip->tv_usec = it % 1000000; 471 } 472 if (rp != NULL) { 473 rp->tv_sec = sec; 474 rp->tv_usec = usec; 475 } 476 } 477 478 /* ARGSUSED */ 479 int 480 sys_getrusage(struct lwp *l, void *v, register_t *retval) 481 { 482 struct sys_getrusage_args /* { 483 syscallarg(int) who; 484 syscallarg(struct rusage *) rusage; 485 } */ *uap = v; 486 struct rusage *rup; 487 struct proc *p = l->l_proc; 488 489 switch (SCARG(uap, who)) { 490 491 case RUSAGE_SELF: 492 rup = &p->p_stats->p_ru; 493 mutex_enter(&p->p_smutex); 494 calcru(p, &rup->ru_utime, &rup->ru_stime, NULL, NULL); 495 mutex_exit(&p->p_smutex); 496 break; 497 498 case RUSAGE_CHILDREN: 499 rup = &p->p_stats->p_cru; 500 break; 501 502 default: 503 return (EINVAL); 504 } 505 return (copyout(rup, SCARG(uap, rusage), sizeof(struct rusage))); 506 } 507 508 void 509 ruadd(struct rusage *ru, struct rusage *ru2) 510 { 511 long *ip, *ip2; 512 int i; 513 514 timeradd(&ru->ru_utime, &ru2->ru_utime, &ru->ru_utime); 515 timeradd(&ru->ru_stime, &ru2->ru_stime, &ru->ru_stime); 516 if (ru->ru_maxrss < ru2->ru_maxrss) 517 ru->ru_maxrss = ru2->ru_maxrss; 518 ip = &ru->ru_first; ip2 = &ru2->ru_first; 519 for (i = &ru->ru_last - &ru->ru_first; i >= 0; i--) 520 *ip++ += *ip2++; 521 } 522 523 /* 524 * Make a copy of the plimit structure. 525 * We share these structures copy-on-write after fork, 526 * and copy when a limit is changed. 527 * 528 * XXXSMP This is atrocious, need to simplify. 529 */ 530 struct plimit * 531 limcopy(struct proc *p) 532 { 533 struct plimit *lim, *newlim; 534 char *corename; 535 size_t l; 536 537 LOCK_ASSERT(mutex_owned(&p->p_mutex)); 538 539 mutex_exit(&p->p_mutex); 540 newlim = pool_get(&plimit_pool, PR_WAITOK); 541 simple_lock_init(&newlim->p_slock); 542 newlim->p_lflags = 0; 543 newlim->p_refcnt = 1; 544 mutex_enter(&p->p_mutex); 545 546 for (;;) { 547 lim = p->p_limit; 548 simple_lock(&lim->p_slock); 549 if (lim->pl_corename != defcorename) { 550 l = strlen(lim->pl_corename) + 1; 551 552 simple_unlock(&lim->p_slock); 553 mutex_exit(&p->p_mutex); 554 corename = malloc(l, M_TEMP, M_WAITOK); 555 mutex_enter(&p->p_mutex); 556 simple_lock(&lim->p_slock); 557 558 if (l != strlen(lim->pl_corename) + 1) { 559 simple_unlock(&lim->p_slock); 560 mutex_exit(&p->p_mutex); 561 free(corename, M_TEMP); 562 mutex_enter(&p->p_mutex); 563 continue; 564 } 565 } else 566 l = 0; 567 568 memcpy(newlim->pl_rlimit, lim->pl_rlimit, 569 sizeof(struct rlimit) * RLIM_NLIMITS); 570 if (l != 0) 571 strlcpy(newlim->pl_corename, lim->pl_corename, l); 572 else 573 newlim->pl_corename = defcorename; 574 simple_unlock(&lim->p_slock); 575 break; 576 } 577 578 return (newlim); 579 } 580 581 void 582 limfree(struct plimit *lim) 583 { 584 int n; 585 586 simple_lock(&lim->p_slock); 587 n = --lim->p_refcnt; 588 simple_unlock(&lim->p_slock); 589 if (n > 0) 590 return; 591 #ifdef DIAGNOSTIC 592 if (n < 0) 593 panic("limfree"); 594 #endif 595 if (lim->pl_corename != defcorename) 596 free(lim->pl_corename, M_TEMP); 597 pool_put(&plimit_pool, lim); 598 } 599 600 struct pstats * 601 pstatscopy(struct pstats *ps) 602 { 603 604 struct pstats *newps; 605 606 newps = pool_get(&pstats_pool, PR_WAITOK); 607 608 memset(&newps->pstat_startzero, 0, 609 (unsigned) ((caddr_t)&newps->pstat_endzero - 610 (caddr_t)&newps->pstat_startzero)); 611 memcpy(&newps->pstat_startcopy, &ps->pstat_startcopy, 612 ((caddr_t)&newps->pstat_endcopy - 613 (caddr_t)&newps->pstat_startcopy)); 614 615 return (newps); 616 617 } 618 619 void 620 pstatsfree(struct pstats *ps) 621 { 622 623 pool_put(&pstats_pool, ps); 624 } 625 626 /* 627 * sysctl interface in five parts 628 */ 629 630 /* 631 * a routine for sysctl proc subtree helpers that need to pick a valid 632 * process by pid. 633 */ 634 static int 635 sysctl_proc_findproc(struct lwp *l, struct proc **p2, pid_t pid) 636 { 637 struct proc *ptmp; 638 int error = 0; 639 640 if (pid == PROC_CURPROC) 641 ptmp = l->l_proc; 642 else if ((ptmp = pfind(pid)) == NULL) 643 error = ESRCH; 644 645 *p2 = ptmp; 646 return (error); 647 } 648 649 /* 650 * sysctl helper routine for setting a process's specific corefile 651 * name. picks the process based on the given pid and checks the 652 * correctness of the new value. 653 */ 654 static int 655 sysctl_proc_corename(SYSCTLFN_ARGS) 656 { 657 struct proc *ptmp; 658 struct plimit *lim; 659 int error = 0, len; 660 char *cname; 661 char *tmp; 662 struct sysctlnode node; 663 664 /* 665 * is this all correct? 666 */ 667 if (namelen != 0) 668 return (EINVAL); 669 if (name[-1] != PROC_PID_CORENAME) 670 return (EINVAL); 671 672 /* 673 * whom are we tweaking? 674 */ 675 error = sysctl_proc_findproc(l, &ptmp, (pid_t)name[-2]); 676 if (error) 677 return (error); 678 679 /* XXX this should be in p_find() */ 680 error = kauth_authorize_process(l->l_cred, KAUTH_PROCESS_CANSEE, 681 ptmp, NULL, NULL, NULL); 682 if (error) 683 return (error); 684 685 cname = PNBUF_GET(); 686 /* 687 * let them modify a temporary copy of the core name 688 */ 689 node = *rnode; 690 strlcpy(cname, ptmp->p_limit->pl_corename, MAXPATHLEN); 691 node.sysctl_data = cname; 692 error = sysctl_lookup(SYSCTLFN_CALL(&node)); 693 694 /* 695 * if that failed, or they have nothing new to say, or we've 696 * heard it before... 697 */ 698 if (error || newp == NULL || 699 strcmp(cname, ptmp->p_limit->pl_corename) == 0) { 700 goto done; 701 } 702 703 error = kauth_authorize_process(l->l_cred, KAUTH_PROCESS_CORENAME, 704 ptmp, cname, NULL, NULL); 705 if (error) 706 return (error); 707 708 /* 709 * no error yet and cname now has the new core name in it. 710 * let's see if it looks acceptable. it must be either "core" 711 * or end in ".core" or "/core". 712 */ 713 len = strlen(cname); 714 if (len < 4) { 715 error = EINVAL; 716 } else if (strcmp(cname + len - 4, "core") != 0) { 717 error = EINVAL; 718 } else if (len > 4 && cname[len - 5] != '/' && cname[len - 5] != '.') { 719 error = EINVAL; 720 } 721 if (error != 0) { 722 goto done; 723 } 724 725 /* 726 * hmm...looks good. now...where do we put it? 727 */ 728 tmp = malloc(len + 1, M_TEMP, M_WAITOK|M_CANFAIL); 729 if (tmp == NULL) { 730 error = ENOMEM; 731 goto done; 732 } 733 strlcpy(tmp, cname, len + 1); 734 735 mutex_enter(&ptmp->p_mutex); 736 lim = ptmp->p_limit; 737 if (lim->p_refcnt > 1 && (lim->p_lflags & PL_SHAREMOD) == 0) { 738 ptmp->p_limit = limcopy(ptmp); 739 limfree(lim); 740 lim = ptmp->p_limit; 741 } 742 if (lim->pl_corename != defcorename) 743 free(lim->pl_corename, M_TEMP); 744 lim->pl_corename = tmp; 745 mutex_exit(&ptmp->p_mutex); 746 done: 747 PNBUF_PUT(cname); 748 return error; 749 } 750 751 /* 752 * sysctl helper routine for checking/setting a process's stop flags, 753 * one for fork and one for exec. 754 */ 755 static int 756 sysctl_proc_stop(SYSCTLFN_ARGS) 757 { 758 struct proc *ptmp; 759 int i, f, error = 0; 760 struct sysctlnode node; 761 762 if (namelen != 0) 763 return (EINVAL); 764 765 error = sysctl_proc_findproc(l, &ptmp, (pid_t)name[-2]); 766 if (error) 767 return (error); 768 769 /* XXX this should be in p_find() */ 770 error = kauth_authorize_process(l->l_cred, KAUTH_PROCESS_CANSEE, 771 ptmp, NULL, NULL, NULL); 772 if (error) 773 return (error); 774 775 switch (rnode->sysctl_num) { 776 case PROC_PID_STOPFORK: 777 f = PS_STOPFORK; 778 break; 779 case PROC_PID_STOPEXEC: 780 f = PS_STOPEXEC; 781 break; 782 case PROC_PID_STOPEXIT: 783 f = PS_STOPEXIT; 784 break; 785 default: 786 return (EINVAL); 787 } 788 789 i = (ptmp->p_flag & f) ? 1 : 0; 790 node = *rnode; 791 node.sysctl_data = &i; 792 error = sysctl_lookup(SYSCTLFN_CALL(&node)); 793 if (error || newp == NULL) 794 return (error); 795 796 mutex_enter(&ptmp->p_smutex); 797 error = kauth_authorize_process(l->l_cred, KAUTH_PROCESS_STOPFLAG, 798 ptmp, KAUTH_ARG(f), NULL, NULL); 799 if (error) 800 return (error); 801 if (i) 802 ptmp->p_sflag |= f; 803 else 804 ptmp->p_sflag &= ~f; 805 mutex_exit(&ptmp->p_smutex); 806 807 return (0); 808 } 809 810 /* 811 * sysctl helper routine for a process's rlimits as exposed by sysctl. 812 */ 813 static int 814 sysctl_proc_plimit(SYSCTLFN_ARGS) 815 { 816 struct proc *ptmp; 817 u_int limitno; 818 int which, error = 0; 819 struct rlimit alim; 820 struct sysctlnode node; 821 822 if (namelen != 0) 823 return (EINVAL); 824 825 which = name[-1]; 826 if (which != PROC_PID_LIMIT_TYPE_SOFT && 827 which != PROC_PID_LIMIT_TYPE_HARD) 828 return (EINVAL); 829 830 limitno = name[-2] - 1; 831 if (limitno >= RLIM_NLIMITS) 832 return (EINVAL); 833 834 if (name[-3] != PROC_PID_LIMIT) 835 return (EINVAL); 836 837 error = sysctl_proc_findproc(l, &ptmp, (pid_t)name[-4]); 838 if (error) 839 return (error); 840 841 /* XXX this should be in p_find() */ 842 error = kauth_authorize_process(l->l_cred, KAUTH_PROCESS_CANSEE, 843 ptmp, NULL, NULL, NULL); 844 if (error) 845 return (error); 846 847 node = *rnode; 848 memcpy(&alim, &ptmp->p_rlimit[limitno], sizeof(alim)); 849 if (which == PROC_PID_LIMIT_TYPE_HARD) 850 node.sysctl_data = &alim.rlim_max; 851 else 852 node.sysctl_data = &alim.rlim_cur; 853 854 error = sysctl_lookup(SYSCTLFN_CALL(&node)); 855 if (error || newp == NULL) 856 return (error); 857 858 return (dosetrlimit(l, ptmp, limitno, &alim)); 859 } 860 861 /* 862 * and finally, the actually glue that sticks it to the tree 863 */ 864 SYSCTL_SETUP(sysctl_proc_setup, "sysctl proc subtree setup") 865 { 866 867 sysctl_createv(clog, 0, NULL, NULL, 868 CTLFLAG_PERMANENT, 869 CTLTYPE_NODE, "proc", NULL, 870 NULL, 0, NULL, 0, 871 CTL_PROC, CTL_EOL); 872 sysctl_createv(clog, 0, NULL, NULL, 873 CTLFLAG_PERMANENT|CTLFLAG_ANYNUMBER, 874 CTLTYPE_NODE, "curproc", 875 SYSCTL_DESCR("Per-process settings"), 876 NULL, 0, NULL, 0, 877 CTL_PROC, PROC_CURPROC, CTL_EOL); 878 879 sysctl_createv(clog, 0, NULL, NULL, 880 CTLFLAG_PERMANENT|CTLFLAG_READWRITE|CTLFLAG_ANYWRITE, 881 CTLTYPE_STRING, "corename", 882 SYSCTL_DESCR("Core file name"), 883 sysctl_proc_corename, 0, NULL, MAXPATHLEN, 884 CTL_PROC, PROC_CURPROC, PROC_PID_CORENAME, CTL_EOL); 885 sysctl_createv(clog, 0, NULL, NULL, 886 CTLFLAG_PERMANENT, 887 CTLTYPE_NODE, "rlimit", 888 SYSCTL_DESCR("Process limits"), 889 NULL, 0, NULL, 0, 890 CTL_PROC, PROC_CURPROC, PROC_PID_LIMIT, CTL_EOL); 891 892 #define create_proc_plimit(s, n) do { \ 893 sysctl_createv(clog, 0, NULL, NULL, \ 894 CTLFLAG_PERMANENT, \ 895 CTLTYPE_NODE, s, \ 896 SYSCTL_DESCR("Process " s " limits"), \ 897 NULL, 0, NULL, 0, \ 898 CTL_PROC, PROC_CURPROC, PROC_PID_LIMIT, n, \ 899 CTL_EOL); \ 900 sysctl_createv(clog, 0, NULL, NULL, \ 901 CTLFLAG_PERMANENT|CTLFLAG_READWRITE|CTLFLAG_ANYWRITE, \ 902 CTLTYPE_QUAD, "soft", \ 903 SYSCTL_DESCR("Process soft " s " limit"), \ 904 sysctl_proc_plimit, 0, NULL, 0, \ 905 CTL_PROC, PROC_CURPROC, PROC_PID_LIMIT, n, \ 906 PROC_PID_LIMIT_TYPE_SOFT, CTL_EOL); \ 907 sysctl_createv(clog, 0, NULL, NULL, \ 908 CTLFLAG_PERMANENT|CTLFLAG_READWRITE|CTLFLAG_ANYWRITE, \ 909 CTLTYPE_QUAD, "hard", \ 910 SYSCTL_DESCR("Process hard " s " limit"), \ 911 sysctl_proc_plimit, 0, NULL, 0, \ 912 CTL_PROC, PROC_CURPROC, PROC_PID_LIMIT, n, \ 913 PROC_PID_LIMIT_TYPE_HARD, CTL_EOL); \ 914 } while (0/*CONSTCOND*/) 915 916 create_proc_plimit("cputime", PROC_PID_LIMIT_CPU); 917 create_proc_plimit("filesize", PROC_PID_LIMIT_FSIZE); 918 create_proc_plimit("datasize", PROC_PID_LIMIT_DATA); 919 create_proc_plimit("stacksize", PROC_PID_LIMIT_STACK); 920 create_proc_plimit("coredumpsize", PROC_PID_LIMIT_CORE); 921 create_proc_plimit("memoryuse", PROC_PID_LIMIT_RSS); 922 create_proc_plimit("memorylocked", PROC_PID_LIMIT_MEMLOCK); 923 create_proc_plimit("maxproc", PROC_PID_LIMIT_NPROC); 924 create_proc_plimit("descriptors", PROC_PID_LIMIT_NOFILE); 925 create_proc_plimit("sbsize", PROC_PID_LIMIT_SBSIZE); 926 927 #undef create_proc_plimit 928 929 sysctl_createv(clog, 0, NULL, NULL, 930 CTLFLAG_PERMANENT|CTLFLAG_READWRITE|CTLFLAG_ANYWRITE, 931 CTLTYPE_INT, "stopfork", 932 SYSCTL_DESCR("Stop process at fork(2)"), 933 sysctl_proc_stop, 0, NULL, 0, 934 CTL_PROC, PROC_CURPROC, PROC_PID_STOPFORK, CTL_EOL); 935 sysctl_createv(clog, 0, NULL, NULL, 936 CTLFLAG_PERMANENT|CTLFLAG_READWRITE|CTLFLAG_ANYWRITE, 937 CTLTYPE_INT, "stopexec", 938 SYSCTL_DESCR("Stop process at execve(2)"), 939 sysctl_proc_stop, 0, NULL, 0, 940 CTL_PROC, PROC_CURPROC, PROC_PID_STOPEXEC, CTL_EOL); 941 sysctl_createv(clog, 0, NULL, NULL, 942 CTLFLAG_PERMANENT|CTLFLAG_READWRITE|CTLFLAG_ANYWRITE, 943 CTLTYPE_INT, "stopexit", 944 SYSCTL_DESCR("Stop process before completing exit"), 945 sysctl_proc_stop, 0, NULL, 0, 946 CTL_PROC, PROC_CURPROC, PROC_PID_STOPEXIT, CTL_EOL); 947 } 948 949 struct uidinfo * 950 uid_find(uid_t uid) 951 { 952 struct uidinfo *uip; 953 struct uidinfo *newuip = NULL; 954 struct uihashhead *uipp; 955 956 uipp = UIHASH(uid); 957 958 again: 959 simple_lock(&uihashtbl_slock); 960 LIST_FOREACH(uip, uipp, ui_hash) 961 if (uip->ui_uid == uid) { 962 simple_unlock(&uihashtbl_slock); 963 if (newuip) 964 free(newuip, M_PROC); 965 return uip; 966 } 967 968 if (newuip == NULL) { 969 simple_unlock(&uihashtbl_slock); 970 newuip = malloc(sizeof(*uip), M_PROC, M_WAITOK | M_ZERO); 971 goto again; 972 } 973 uip = newuip; 974 975 LIST_INSERT_HEAD(uipp, uip, ui_hash); 976 uip->ui_uid = uid; 977 simple_lock_init(&uip->ui_slock); 978 simple_unlock(&uihashtbl_slock); 979 980 return uip; 981 } 982 983 /* 984 * Change the count associated with number of processes 985 * a given user is using. 986 */ 987 int 988 chgproccnt(uid_t uid, int diff) 989 { 990 struct uidinfo *uip; 991 int s; 992 993 if (diff == 0) 994 return 0; 995 996 uip = uid_find(uid); 997 UILOCK(uip, s); 998 uip->ui_proccnt += diff; 999 KASSERT(uip->ui_proccnt >= 0); 1000 UIUNLOCK(uip, s); 1001 return uip->ui_proccnt; 1002 } 1003 1004 int 1005 chgsbsize(struct uidinfo *uip, u_long *hiwat, u_long to, rlim_t xmax) 1006 { 1007 rlim_t nsb; 1008 int s; 1009 1010 UILOCK(uip, s); 1011 nsb = uip->ui_sbsize + to - *hiwat; 1012 if (to > *hiwat && nsb > xmax) { 1013 UIUNLOCK(uip, s); 1014 splx(s); 1015 return 0; 1016 } 1017 *hiwat = to; 1018 uip->ui_sbsize = nsb; 1019 KASSERT(uip->ui_sbsize >= 0); 1020 UIUNLOCK(uip, s); 1021 return 1; 1022 } 1023
Indexes created Sun Sep 21 20:09:37 GMT 2025