Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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sys/kern/kern_resource.c
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1 /* $NetBSD: kern_resource.c,v 1.147.4.2 2009/08/14 21:15:16 snj 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 1.147.4.2 2009/08/14 21:15:16 snj 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/kmem.h> 49 #include <sys/namei.h> 50 #include <sys/pool.h> 51 #include <sys/proc.h> 52 #include <sys/sysctl.h> 53 #include <sys/timevar.h> 54 #include <sys/kauth.h> 55 #include <sys/atomic.h> 56 #include <sys/mount.h> 57 #include <sys/syscallargs.h> 58 #include <sys/atomic.h> 59 60 #include <uvm/uvm_extern.h> 61 62 /* 63 * Maximum process data and stack limits. 64 * They are variables so they are patchable. 65 */ 66 rlim_t maxdmap = MAXDSIZ; 67 rlim_t maxsmap = MAXSSIZ; 68 69 static pool_cache_t plimit_cache; 70 static pool_cache_t pstats_cache; 71 72 void 73 resource_init(void) 74 { 75 76 plimit_cache = pool_cache_init(sizeof(struct plimit), 0, 0, 0, 77 "plimitpl", NULL, IPL_NONE, NULL, NULL, NULL); 78 pstats_cache = pool_cache_init(sizeof(struct pstats), 0, 0, 0, 79 "pstatspl", NULL, IPL_NONE, NULL, NULL, NULL); 80 } 81 82 /* 83 * Resource controls and accounting. 84 */ 85 86 int 87 sys_getpriority(struct lwp *l, const struct sys_getpriority_args *uap, 88 register_t *retval) 89 { 90 /* { 91 syscallarg(int) which; 92 syscallarg(id_t) who; 93 } */ 94 struct proc *curp = l->l_proc, *p; 95 int low = NZERO + PRIO_MAX + 1; 96 int who = SCARG(uap, who); 97 98 mutex_enter(proc_lock); 99 switch (SCARG(uap, which)) { 100 case PRIO_PROCESS: 101 if (who == 0) 102 p = curp; 103 else 104 p = p_find(who, PFIND_LOCKED); 105 if (p != NULL) 106 low = p->p_nice; 107 break; 108 109 case PRIO_PGRP: { 110 struct pgrp *pg; 111 112 if (who == 0) 113 pg = curp->p_pgrp; 114 else if ((pg = pg_find(who, PFIND_LOCKED)) == NULL) 115 break; 116 LIST_FOREACH(p, &pg->pg_members, p_pglist) { 117 if (p->p_nice < low) 118 low = p->p_nice; 119 } 120 break; 121 } 122 123 case PRIO_USER: 124 if (who == 0) 125 who = (int)kauth_cred_geteuid(l->l_cred); 126 PROCLIST_FOREACH(p, &allproc) { 127 if ((p->p_flag & PK_MARKER) != 0) 128 continue; 129 mutex_enter(p->p_lock); 130 if (kauth_cred_geteuid(p->p_cred) == 131 (uid_t)who && p->p_nice < low) 132 low = p->p_nice; 133 mutex_exit(p->p_lock); 134 } 135 break; 136 137 default: 138 mutex_exit(proc_lock); 139 return (EINVAL); 140 } 141 mutex_exit(proc_lock); 142 143 if (low == NZERO + PRIO_MAX + 1) 144 return (ESRCH); 145 *retval = low - NZERO; 146 return (0); 147 } 148 149 /* ARGSUSED */ 150 int 151 sys_setpriority(struct lwp *l, const struct sys_setpriority_args *uap, 152 register_t *retval) 153 { 154 /* { 155 syscallarg(int) which; 156 syscallarg(id_t) who; 157 syscallarg(int) prio; 158 } */ 159 struct proc *curp = l->l_proc, *p; 160 int found = 0, error = 0; 161 int who = SCARG(uap, who); 162 163 mutex_enter(proc_lock); 164 switch (SCARG(uap, which)) { 165 case PRIO_PROCESS: 166 if (who == 0) 167 p = curp; 168 else 169 p = p_find(who, PFIND_LOCKED); 170 if (p != 0) { 171 mutex_enter(p->p_lock); 172 error = donice(l, p, SCARG(uap, prio)); 173 mutex_exit(p->p_lock); 174 found++; 175 } 176 break; 177 178 case PRIO_PGRP: { 179 struct pgrp *pg; 180 181 if (who == 0) 182 pg = curp->p_pgrp; 183 else if ((pg = pg_find(who, PFIND_LOCKED)) == NULL) 184 break; 185 LIST_FOREACH(p, &pg->pg_members, p_pglist) { 186 mutex_enter(p->p_lock); 187 error = donice(l, p, SCARG(uap, prio)); 188 mutex_exit(p->p_lock); 189 found++; 190 } 191 break; 192 } 193 194 case PRIO_USER: 195 if (who == 0) 196 who = (int)kauth_cred_geteuid(l->l_cred); 197 PROCLIST_FOREACH(p, &allproc) { 198 if ((p->p_flag & PK_MARKER) != 0) 199 continue; 200 mutex_enter(p->p_lock); 201 if (kauth_cred_geteuid(p->p_cred) == 202 (uid_t)SCARG(uap, who)) { 203 error = donice(l, p, SCARG(uap, prio)); 204 found++; 205 } 206 mutex_exit(p->p_lock); 207 } 208 break; 209 210 default: 211 mutex_exit(proc_lock); 212 return EINVAL; 213 } 214 mutex_exit(proc_lock); 215 if (found == 0) 216 return (ESRCH); 217 return (error); 218 } 219 220 /* 221 * Renice a process. 222 * 223 * Call with the target process' credentials locked. 224 */ 225 int 226 donice(struct lwp *l, struct proc *chgp, int n) 227 { 228 kauth_cred_t cred = l->l_cred; 229 230 KASSERT(mutex_owned(chgp->p_lock)); 231 232 if (kauth_cred_geteuid(cred) && kauth_cred_getuid(cred) && 233 kauth_cred_geteuid(cred) != kauth_cred_geteuid(chgp->p_cred) && 234 kauth_cred_getuid(cred) != kauth_cred_geteuid(chgp->p_cred)) 235 return (EPERM); 236 237 if (n > PRIO_MAX) 238 n = PRIO_MAX; 239 if (n < PRIO_MIN) 240 n = PRIO_MIN; 241 n += NZERO; 242 if (kauth_authorize_process(cred, KAUTH_PROCESS_NICE, chgp, 243 KAUTH_ARG(n), NULL, NULL)) 244 return (EACCES); 245 sched_nice(chgp, n); 246 return (0); 247 } 248 249 /* ARGSUSED */ 250 int 251 sys_setrlimit(struct lwp *l, const struct sys_setrlimit_args *uap, 252 register_t *retval) 253 { 254 /* { 255 syscallarg(int) which; 256 syscallarg(const struct rlimit *) rlp; 257 } */ 258 int which = SCARG(uap, which); 259 struct rlimit alim; 260 int error; 261 262 error = copyin(SCARG(uap, rlp), &alim, sizeof(struct rlimit)); 263 if (error) 264 return (error); 265 return (dosetrlimit(l, l->l_proc, which, &alim)); 266 } 267 268 int 269 dosetrlimit(struct lwp *l, struct proc *p, int which, struct rlimit *limp) 270 { 271 struct rlimit *alimp; 272 int error; 273 274 if ((u_int)which >= RLIM_NLIMITS) 275 return (EINVAL); 276 277 if (limp->rlim_cur < 0 || limp->rlim_max < 0) 278 return (EINVAL); 279 280 if (limp->rlim_cur > limp->rlim_max) { 281 /* 282 * This is programming error. According to SUSv2, we should 283 * return error in this case. 284 */ 285 return (EINVAL); 286 } 287 288 alimp = &p->p_rlimit[which]; 289 /* if we don't change the value, no need to limcopy() */ 290 if (limp->rlim_cur == alimp->rlim_cur && 291 limp->rlim_max == alimp->rlim_max) 292 return 0; 293 294 error = kauth_authorize_process(l->l_cred, KAUTH_PROCESS_RLIMIT, 295 p, KAUTH_ARG(KAUTH_REQ_PROCESS_RLIMIT_SET), limp, KAUTH_ARG(which)); 296 if (error) 297 return (error); 298 299 lim_privatise(p, false); 300 /* p->p_limit is now unchangeable */ 301 alimp = &p->p_rlimit[which]; 302 303 switch (which) { 304 305 case RLIMIT_DATA: 306 if (limp->rlim_cur > maxdmap) 307 limp->rlim_cur = maxdmap; 308 if (limp->rlim_max > maxdmap) 309 limp->rlim_max = maxdmap; 310 break; 311 312 case RLIMIT_STACK: 313 if (limp->rlim_cur > maxsmap) 314 limp->rlim_cur = maxsmap; 315 if (limp->rlim_max > maxsmap) 316 limp->rlim_max = maxsmap; 317 318 /* 319 * Return EINVAL if the new stack size limit is lower than 320 * current usage. Otherwise, the process would get SIGSEGV the 321 * moment it would try to access anything on it's current stack. 322 * This conforms to SUSv2. 323 */ 324 if (limp->rlim_cur < p->p_vmspace->vm_ssize * PAGE_SIZE 325 || limp->rlim_max < p->p_vmspace->vm_ssize * PAGE_SIZE) { 326 return (EINVAL); 327 } 328 329 /* 330 * Stack is allocated to the max at exec time with 331 * only "rlim_cur" bytes accessible (In other words, 332 * allocates stack dividing two contiguous regions at 333 * "rlim_cur" bytes boundary). 334 * 335 * Since allocation is done in terms of page, roundup 336 * "rlim_cur" (otherwise, contiguous regions 337 * overlap). If stack limit is going up make more 338 * accessible, if going down make inaccessible. 339 */ 340 limp->rlim_cur = round_page(limp->rlim_cur); 341 if (limp->rlim_cur != alimp->rlim_cur) { 342 vaddr_t addr; 343 vsize_t size; 344 vm_prot_t prot; 345 346 if (limp->rlim_cur > alimp->rlim_cur) { 347 prot = VM_PROT_READ | VM_PROT_WRITE; 348 size = limp->rlim_cur - alimp->rlim_cur; 349 addr = (vaddr_t)p->p_vmspace->vm_minsaddr - 350 limp->rlim_cur; 351 } else { 352 prot = VM_PROT_NONE; 353 size = alimp->rlim_cur - limp->rlim_cur; 354 addr = (vaddr_t)p->p_vmspace->vm_minsaddr - 355 alimp->rlim_cur; 356 } 357 (void) uvm_map_protect(&p->p_vmspace->vm_map, 358 addr, addr+size, prot, false); 359 } 360 break; 361 362 case RLIMIT_NOFILE: 363 if (limp->rlim_cur > maxfiles) 364 limp->rlim_cur = maxfiles; 365 if (limp->rlim_max > maxfiles) 366 limp->rlim_max = maxfiles; 367 break; 368 369 case RLIMIT_NPROC: 370 if (limp->rlim_cur > maxproc) 371 limp->rlim_cur = maxproc; 372 if (limp->rlim_max > maxproc) 373 limp->rlim_max = maxproc; 374 break; 375 } 376 377 mutex_enter(&p->p_limit->pl_lock); 378 *alimp = *limp; 379 mutex_exit(&p->p_limit->pl_lock); 380 return (0); 381 } 382 383 /* ARGSUSED */ 384 int 385 sys_getrlimit(struct lwp *l, const struct sys_getrlimit_args *uap, 386 register_t *retval) 387 { 388 /* { 389 syscallarg(int) which; 390 syscallarg(struct rlimit *) rlp; 391 } */ 392 struct proc *p = l->l_proc; 393 int which = SCARG(uap, which); 394 struct rlimit rl; 395 396 if ((u_int)which >= RLIM_NLIMITS) 397 return (EINVAL); 398 399 mutex_enter(p->p_lock); 400 memcpy(&rl, &p->p_rlimit[which], sizeof(rl)); 401 mutex_exit(p->p_lock); 402 403 return copyout(&rl, SCARG(uap, rlp), sizeof(rl)); 404 } 405 406 /* 407 * Transform the running time and tick information in proc p into user, 408 * system, and interrupt time usage. 409 * 410 * Should be called with p->p_lock held unless called from exit1(). 411 */ 412 void 413 calcru(struct proc *p, struct timeval *up, struct timeval *sp, 414 struct timeval *ip, struct timeval *rp) 415 { 416 uint64_t u, st, ut, it, tot; 417 struct lwp *l; 418 struct bintime tm; 419 struct timeval tv; 420 421 mutex_spin_enter(&p->p_stmutex); 422 st = p->p_sticks; 423 ut = p->p_uticks; 424 it = p->p_iticks; 425 mutex_spin_exit(&p->p_stmutex); 426 427 tm = p->p_rtime; 428 429 LIST_FOREACH(l, &p->p_lwps, l_sibling) { 430 lwp_lock(l); 431 bintime_add(&tm, &l->l_rtime); 432 if ((l->l_pflag & LP_RUNNING) != 0) { 433 struct bintime diff; 434 /* 435 * Adjust for the current time slice. This is 436 * actually fairly important since the error 437 * here is on the order of a time quantum, 438 * which is much greater than the sampling 439 * error. 440 */ 441 binuptime(&diff); 442 bintime_sub(&diff, &l->l_stime); 443 bintime_add(&tm, &diff); 444 } 445 lwp_unlock(l); 446 } 447 448 tot = st + ut + it; 449 bintime2timeval(&tm, &tv); 450 u = (uint64_t)tv.tv_sec * 1000000ul + tv.tv_usec; 451 452 if (tot == 0) { 453 /* No ticks, so can't use to share time out, split 50-50 */ 454 st = ut = u / 2; 455 } else { 456 st = (u * st) / tot; 457 ut = (u * ut) / tot; 458 } 459 if (sp != NULL) { 460 sp->tv_sec = st / 1000000; 461 sp->tv_usec = st % 1000000; 462 } 463 if (up != NULL) { 464 up->tv_sec = ut / 1000000; 465 up->tv_usec = ut % 1000000; 466 } 467 if (ip != NULL) { 468 if (it != 0) 469 it = (u * it) / tot; 470 ip->tv_sec = it / 1000000; 471 ip->tv_usec = it % 1000000; 472 } 473 if (rp != NULL) { 474 *rp = tv; 475 } 476 } 477 478 /* ARGSUSED */ 479 int 480 sys_getrusage(struct lwp *l, const struct sys_getrusage_args *uap, 481 register_t *retval) 482 { 483 /* { 484 syscallarg(int) who; 485 syscallarg(struct rusage *) rusage; 486 } */ 487 struct rusage ru; 488 struct proc *p = l->l_proc; 489 490 switch (SCARG(uap, who)) { 491 case RUSAGE_SELF: 492 mutex_enter(p->p_lock); 493 memcpy(&ru, &p->p_stats->p_ru, sizeof(ru)); 494 calcru(p, &ru.ru_utime, &ru.ru_stime, NULL, NULL); 495 rulwps(p, &ru); 496 mutex_exit(p->p_lock); 497 break; 498 499 case RUSAGE_CHILDREN: 500 mutex_enter(p->p_lock); 501 memcpy(&ru, &p->p_stats->p_cru, sizeof(ru)); 502 mutex_exit(p->p_lock); 503 break; 504 505 default: 506 return EINVAL; 507 } 508 509 return copyout(&ru, SCARG(uap, rusage), sizeof(ru)); 510 } 511 512 void 513 ruadd(struct rusage *ru, struct rusage *ru2) 514 { 515 long *ip, *ip2; 516 int i; 517 518 timeradd(&ru->ru_utime, &ru2->ru_utime, &ru->ru_utime); 519 timeradd(&ru->ru_stime, &ru2->ru_stime, &ru->ru_stime); 520 if (ru->ru_maxrss < ru2->ru_maxrss) 521 ru->ru_maxrss = ru2->ru_maxrss; 522 ip = &ru->ru_first; ip2 = &ru2->ru_first; 523 for (i = &ru->ru_last - &ru->ru_first; i >= 0; i--) 524 *ip++ += *ip2++; 525 } 526 527 void 528 rulwps(proc_t *p, struct rusage *ru) 529 { 530 lwp_t *l; 531 532 KASSERT(mutex_owned(p->p_lock)); 533 534 LIST_FOREACH(l, &p->p_lwps, l_sibling) { 535 ruadd(ru, &l->l_ru); 536 ru->ru_nvcsw += (l->l_ncsw - l->l_nivcsw); 537 ru->ru_nivcsw += l->l_nivcsw; 538 } 539 } 540 541 /* 542 * Make a copy of the plimit structure. 543 * We share these structures copy-on-write after fork, 544 * and copy when a limit is changed. 545 * 546 * Unfortunately (due to PL_SHAREMOD) it is possibly for the structure 547 * we are copying to change beneath our feet! 548 */ 549 struct plimit * 550 lim_copy(struct plimit *lim) 551 { 552 struct plimit *newlim; 553 char *corename; 554 size_t alen, len; 555 556 newlim = pool_cache_get(plimit_cache, PR_WAITOK); 557 mutex_init(&newlim->pl_lock, MUTEX_DEFAULT, IPL_NONE); 558 newlim->pl_flags = 0; 559 newlim->pl_refcnt = 1; 560 newlim->pl_sv_limit = NULL; 561 562 mutex_enter(&lim->pl_lock); 563 memcpy(newlim->pl_rlimit, lim->pl_rlimit, 564 sizeof(struct rlimit) * RLIM_NLIMITS); 565 566 alen = 0; 567 corename = NULL; 568 for (;;) { 569 if (lim->pl_corename == defcorename) { 570 newlim->pl_corename = defcorename; 571 break; 572 } 573 len = strlen(lim->pl_corename) + 1; 574 if (len <= alen) { 575 newlim->pl_corename = corename; 576 memcpy(corename, lim->pl_corename, len); 577 corename = NULL; 578 break; 579 } 580 mutex_exit(&lim->pl_lock); 581 if (corename != NULL) 582 free(corename, M_TEMP); 583 alen = len; 584 corename = malloc(alen, M_TEMP, M_WAITOK); 585 mutex_enter(&lim->pl_lock); 586 } 587 mutex_exit(&lim->pl_lock); 588 if (corename != NULL) 589 free(corename, M_TEMP); 590 return newlim; 591 } 592 593 void 594 lim_addref(struct plimit *lim) 595 { 596 atomic_inc_uint(&lim->pl_refcnt); 597 } 598 599 /* 600 * Give a process it's own private plimit structure. 601 * This will only be shared (in fork) if modifications are to be shared. 602 */ 603 void 604 lim_privatise(struct proc *p, bool set_shared) 605 { 606 struct plimit *lim, *newlim; 607 608 lim = p->p_limit; 609 if (lim->pl_flags & PL_WRITEABLE) { 610 if (set_shared) 611 lim->pl_flags |= PL_SHAREMOD; 612 return; 613 } 614 615 if (set_shared && lim->pl_flags & PL_SHAREMOD) 616 return; 617 618 newlim = lim_copy(lim); 619 620 mutex_enter(p->p_lock); 621 if (p->p_limit->pl_flags & PL_WRITEABLE) { 622 /* Someone crept in while we were busy */ 623 mutex_exit(p->p_lock); 624 limfree(newlim); 625 if (set_shared) 626 p->p_limit->pl_flags |= PL_SHAREMOD; 627 return; 628 } 629 630 /* 631 * Since most accesses to p->p_limit aren't locked, we must not 632 * delete the old limit structure yet. 633 */ 634 newlim->pl_sv_limit = p->p_limit; 635 newlim->pl_flags |= PL_WRITEABLE; 636 if (set_shared) 637 newlim->pl_flags |= PL_SHAREMOD; 638 p->p_limit = newlim; 639 mutex_exit(p->p_lock); 640 } 641 642 void 643 limfree(struct plimit *lim) 644 { 645 struct plimit *sv_lim; 646 647 do { 648 if (atomic_dec_uint_nv(&lim->pl_refcnt) > 0) 649 return; 650 if (lim->pl_corename != defcorename) 651 free(lim->pl_corename, M_TEMP); 652 sv_lim = lim->pl_sv_limit; 653 mutex_destroy(&lim->pl_lock); 654 pool_cache_put(plimit_cache, lim); 655 } while ((lim = sv_lim) != NULL); 656 } 657 658 struct pstats * 659 pstatscopy(struct pstats *ps) 660 { 661 662 struct pstats *newps; 663 664 newps = pool_cache_get(pstats_cache, PR_WAITOK); 665 666 memset(&newps->pstat_startzero, 0, 667 (unsigned) ((char *)&newps->pstat_endzero - 668 (char *)&newps->pstat_startzero)); 669 memcpy(&newps->pstat_startcopy, &ps->pstat_startcopy, 670 ((char *)&newps->pstat_endcopy - 671 (char *)&newps->pstat_startcopy)); 672 673 return (newps); 674 675 } 676 677 void 678 pstatsfree(struct pstats *ps) 679 { 680 681 pool_cache_put(pstats_cache, ps); 682 } 683 684 /* 685 * sysctl interface in five parts 686 */ 687 688 /* 689 * a routine for sysctl proc subtree helpers that need to pick a valid 690 * process by pid. 691 */ 692 static int 693 sysctl_proc_findproc(struct lwp *l, struct proc **p2, pid_t pid) 694 { 695 struct proc *ptmp; 696 int error = 0; 697 698 if (pid == PROC_CURPROC) 699 ptmp = l->l_proc; 700 else if ((ptmp = pfind(pid)) == NULL) 701 error = ESRCH; 702 703 *p2 = ptmp; 704 return (error); 705 } 706 707 /* 708 * sysctl helper routine for setting a process's specific corefile 709 * name. picks the process based on the given pid and checks the 710 * correctness of the new value. 711 */ 712 static int 713 sysctl_proc_corename(SYSCTLFN_ARGS) 714 { 715 struct proc *ptmp; 716 struct plimit *lim; 717 int error = 0, len; 718 char *cname; 719 char *ocore; 720 char *tmp; 721 struct sysctlnode node; 722 723 /* 724 * is this all correct? 725 */ 726 if (namelen != 0) 727 return (EINVAL); 728 if (name[-1] != PROC_PID_CORENAME) 729 return (EINVAL); 730 731 /* 732 * whom are we tweaking? 733 */ 734 error = sysctl_proc_findproc(l, &ptmp, (pid_t)name[-2]); 735 if (error) 736 return (error); 737 738 /* XXX-elad */ 739 error = kauth_authorize_process(l->l_cred, KAUTH_PROCESS_CANSEE, ptmp, 740 KAUTH_ARG(KAUTH_REQ_PROCESS_CANSEE_ENTRY), NULL, NULL); 741 if (error) 742 return (error); 743 744 if (newp == NULL) { 745 error = kauth_authorize_process(l->l_cred, 746 KAUTH_PROCESS_CORENAME, ptmp, 747 KAUTH_ARG(KAUTH_REQ_PROCESS_CORENAME_GET), NULL, NULL); 748 if (error) 749 return (error); 750 } 751 752 /* 753 * let them modify a temporary copy of the core name 754 */ 755 cname = PNBUF_GET(); 756 lim = ptmp->p_limit; 757 mutex_enter(&lim->pl_lock); 758 strlcpy(cname, lim->pl_corename, MAXPATHLEN); 759 mutex_exit(&lim->pl_lock); 760 761 node = *rnode; 762 node.sysctl_data = cname; 763 error = sysctl_lookup(SYSCTLFN_CALL(&node)); 764 765 /* 766 * if that failed, or they have nothing new to say, or we've 767 * heard it before... 768 */ 769 if (error || newp == NULL) 770 goto done; 771 lim = ptmp->p_limit; 772 mutex_enter(&lim->pl_lock); 773 error = strcmp(cname, lim->pl_corename); 774 mutex_exit(&lim->pl_lock); 775 if (error == 0) 776 /* Unchanged */ 777 goto done; 778 779 error = kauth_authorize_process(l->l_cred, KAUTH_PROCESS_CORENAME, 780 ptmp, KAUTH_ARG(KAUTH_REQ_PROCESS_CORENAME_SET), cname, NULL); 781 if (error) 782 return (error); 783 784 /* 785 * no error yet and cname now has the new core name in it. 786 * let's see if it looks acceptable. it must be either "core" 787 * or end in ".core" or "/core". 788 */ 789 len = strlen(cname); 790 if (len < 4) { 791 error = EINVAL; 792 } else if (strcmp(cname + len - 4, "core") != 0) { 793 error = EINVAL; 794 } else if (len > 4 && cname[len - 5] != '/' && cname[len - 5] != '.') { 795 error = EINVAL; 796 } 797 if (error != 0) { 798 goto done; 799 } 800 801 /* 802 * hmm...looks good. now...where do we put it? 803 */ 804 tmp = malloc(len + 1, M_TEMP, M_WAITOK|M_CANFAIL); 805 if (tmp == NULL) { 806 error = ENOMEM; 807 goto done; 808 } 809 memcpy(tmp, cname, len + 1); 810 811 lim_privatise(ptmp, false); 812 lim = ptmp->p_limit; 813 mutex_enter(&lim->pl_lock); 814 ocore = lim->pl_corename; 815 lim->pl_corename = tmp; 816 mutex_exit(&lim->pl_lock); 817 if (ocore != defcorename) 818 free(ocore, M_TEMP); 819 820 done: 821 PNBUF_PUT(cname); 822 return error; 823 } 824 825 /* 826 * sysctl helper routine for checking/setting a process's stop flags, 827 * one for fork and one for exec. 828 */ 829 static int 830 sysctl_proc_stop(SYSCTLFN_ARGS) 831 { 832 struct proc *ptmp; 833 int i, f, error = 0; 834 struct sysctlnode node; 835 836 if (namelen != 0) 837 return (EINVAL); 838 839 error = sysctl_proc_findproc(l, &ptmp, (pid_t)name[-2]); 840 if (error) 841 return (error); 842 843 /* XXX-elad */ 844 error = kauth_authorize_process(l->l_cred, KAUTH_PROCESS_CANSEE, ptmp, 845 KAUTH_ARG(KAUTH_REQ_PROCESS_CANSEE_ENTRY), NULL, NULL); 846 if (error) 847 return (error); 848 849 switch (rnode->sysctl_num) { 850 case PROC_PID_STOPFORK: 851 f = PS_STOPFORK; 852 break; 853 case PROC_PID_STOPEXEC: 854 f = PS_STOPEXEC; 855 break; 856 case PROC_PID_STOPEXIT: 857 f = PS_STOPEXIT; 858 break; 859 default: 860 return (EINVAL); 861 } 862 863 i = (ptmp->p_flag & f) ? 1 : 0; 864 node = *rnode; 865 node.sysctl_data = &i; 866 error = sysctl_lookup(SYSCTLFN_CALL(&node)); 867 if (error || newp == NULL) 868 return (error); 869 870 mutex_enter(ptmp->p_lock); 871 error = kauth_authorize_process(l->l_cred, KAUTH_PROCESS_STOPFLAG, 872 ptmp, KAUTH_ARG(f), NULL, NULL); 873 if (!error) { 874 if (i) { 875 ptmp->p_sflag |= f; 876 } else { 877 ptmp->p_sflag &= ~f; 878 } 879 } 880 mutex_exit(ptmp->p_lock); 881 882 return error; 883 } 884 885 /* 886 * sysctl helper routine for a process's rlimits as exposed by sysctl. 887 */ 888 static int 889 sysctl_proc_plimit(SYSCTLFN_ARGS) 890 { 891 struct proc *ptmp; 892 u_int limitno; 893 int which, error = 0; 894 struct rlimit alim; 895 struct sysctlnode node; 896 897 if (namelen != 0) 898 return (EINVAL); 899 900 which = name[-1]; 901 if (which != PROC_PID_LIMIT_TYPE_SOFT && 902 which != PROC_PID_LIMIT_TYPE_HARD) 903 return (EINVAL); 904 905 limitno = name[-2] - 1; 906 if (limitno >= RLIM_NLIMITS) 907 return (EINVAL); 908 909 if (name[-3] != PROC_PID_LIMIT) 910 return (EINVAL); 911 912 error = sysctl_proc_findproc(l, &ptmp, (pid_t)name[-4]); 913 if (error) 914 return (error); 915 916 /* XXX-elad */ 917 error = kauth_authorize_process(l->l_cred, KAUTH_PROCESS_CANSEE, ptmp, 918 KAUTH_ARG(KAUTH_REQ_PROCESS_CANSEE_ENTRY), NULL, NULL); 919 if (error) 920 return (error); 921 922 /* Check if we can view limits. */ 923 if (newp == NULL) { 924 error = kauth_authorize_process(l->l_cred, KAUTH_PROCESS_RLIMIT, 925 ptmp, KAUTH_ARG(KAUTH_REQ_PROCESS_RLIMIT_GET), &alim, 926 KAUTH_ARG(which)); 927 if (error) 928 return (error); 929 } 930 931 node = *rnode; 932 memcpy(&alim, &ptmp->p_rlimit[limitno], sizeof(alim)); 933 if (which == PROC_PID_LIMIT_TYPE_HARD) 934 node.sysctl_data = &alim.rlim_max; 935 else 936 node.sysctl_data = &alim.rlim_cur; 937 938 error = sysctl_lookup(SYSCTLFN_CALL(&node)); 939 if (error || newp == NULL) 940 return (error); 941 942 return (dosetrlimit(l, ptmp, limitno, &alim)); 943 } 944 945 /* 946 * and finally, the actually glue that sticks it to the tree 947 */ 948 SYSCTL_SETUP(sysctl_proc_setup, "sysctl proc subtree setup") 949 { 950 951 sysctl_createv(clog, 0, NULL, NULL, 952 CTLFLAG_PERMANENT, 953 CTLTYPE_NODE, "proc", NULL, 954 NULL, 0, NULL, 0, 955 CTL_PROC, CTL_EOL); 956 sysctl_createv(clog, 0, NULL, NULL, 957 CTLFLAG_PERMANENT|CTLFLAG_ANYNUMBER, 958 CTLTYPE_NODE, "curproc", 959 SYSCTL_DESCR("Per-process settings"), 960 NULL, 0, NULL, 0, 961 CTL_PROC, PROC_CURPROC, CTL_EOL); 962 963 sysctl_createv(clog, 0, NULL, NULL, 964 CTLFLAG_PERMANENT|CTLFLAG_READWRITE|CTLFLAG_ANYWRITE, 965 CTLTYPE_STRING, "corename", 966 SYSCTL_DESCR("Core file name"), 967 sysctl_proc_corename, 0, NULL, MAXPATHLEN, 968 CTL_PROC, PROC_CURPROC, PROC_PID_CORENAME, CTL_EOL); 969 sysctl_createv(clog, 0, NULL, NULL, 970 CTLFLAG_PERMANENT, 971 CTLTYPE_NODE, "rlimit", 972 SYSCTL_DESCR("Process limits"), 973 NULL, 0, NULL, 0, 974 CTL_PROC, PROC_CURPROC, PROC_PID_LIMIT, CTL_EOL); 975 976 #define create_proc_plimit(s, n) do { \ 977 sysctl_createv(clog, 0, NULL, NULL, \ 978 CTLFLAG_PERMANENT, \ 979 CTLTYPE_NODE, s, \ 980 SYSCTL_DESCR("Process " s " limits"), \ 981 NULL, 0, NULL, 0, \ 982 CTL_PROC, PROC_CURPROC, PROC_PID_LIMIT, n, \ 983 CTL_EOL); \ 984 sysctl_createv(clog, 0, NULL, NULL, \ 985 CTLFLAG_PERMANENT|CTLFLAG_READWRITE|CTLFLAG_ANYWRITE, \ 986 CTLTYPE_QUAD, "soft", \ 987 SYSCTL_DESCR("Process soft " s " limit"), \ 988 sysctl_proc_plimit, 0, NULL, 0, \ 989 CTL_PROC, PROC_CURPROC, PROC_PID_LIMIT, n, \ 990 PROC_PID_LIMIT_TYPE_SOFT, CTL_EOL); \ 991 sysctl_createv(clog, 0, NULL, NULL, \ 992 CTLFLAG_PERMANENT|CTLFLAG_READWRITE|CTLFLAG_ANYWRITE, \ 993 CTLTYPE_QUAD, "hard", \ 994 SYSCTL_DESCR("Process hard " s " limit"), \ 995 sysctl_proc_plimit, 0, NULL, 0, \ 996 CTL_PROC, PROC_CURPROC, PROC_PID_LIMIT, n, \ 997 PROC_PID_LIMIT_TYPE_HARD, CTL_EOL); \ 998 } while (0/*CONSTCOND*/) 999 1000 create_proc_plimit("cputime", PROC_PID_LIMIT_CPU); 1001 create_proc_plimit("filesize", PROC_PID_LIMIT_FSIZE); 1002 create_proc_plimit("datasize", PROC_PID_LIMIT_DATA); 1003 create_proc_plimit("stacksize", PROC_PID_LIMIT_STACK); 1004 create_proc_plimit("coredumpsize", PROC_PID_LIMIT_CORE); 1005 create_proc_plimit("memoryuse", PROC_PID_LIMIT_RSS); 1006 create_proc_plimit("memorylocked", PROC_PID_LIMIT_MEMLOCK); 1007 create_proc_plimit("maxproc", PROC_PID_LIMIT_NPROC); 1008 create_proc_plimit("descriptors", PROC_PID_LIMIT_NOFILE); 1009 create_proc_plimit("sbsize", PROC_PID_LIMIT_SBSIZE); 1010 create_proc_plimit("vmemoryuse", PROC_PID_LIMIT_AS); 1011 1012 #undef create_proc_plimit 1013 1014 sysctl_createv(clog, 0, NULL, NULL, 1015 CTLFLAG_PERMANENT|CTLFLAG_READWRITE|CTLFLAG_ANYWRITE, 1016 CTLTYPE_INT, "stopfork", 1017 SYSCTL_DESCR("Stop process at fork(2)"), 1018 sysctl_proc_stop, 0, NULL, 0, 1019 CTL_PROC, PROC_CURPROC, PROC_PID_STOPFORK, CTL_EOL); 1020 sysctl_createv(clog, 0, NULL, NULL, 1021 CTLFLAG_PERMANENT|CTLFLAG_READWRITE|CTLFLAG_ANYWRITE, 1022 CTLTYPE_INT, "stopexec", 1023 SYSCTL_DESCR("Stop process at execve(2)"), 1024 sysctl_proc_stop, 0, NULL, 0, 1025 CTL_PROC, PROC_CURPROC, PROC_PID_STOPEXEC, CTL_EOL); 1026 sysctl_createv(clog, 0, NULL, NULL, 1027 CTLFLAG_PERMANENT|CTLFLAG_READWRITE|CTLFLAG_ANYWRITE, 1028 CTLTYPE_INT, "stopexit", 1029 SYSCTL_DESCR("Stop process before completing exit"), 1030 sysctl_proc_stop, 0, NULL, 0, 1031 CTL_PROC, PROC_CURPROC, PROC_PID_STOPEXIT, CTL_EOL); 1032 }
Cache object: b28b75859465c4f45e78f14c087b3b48
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