1 /* $OpenBSD: kern_ktrace.c,v 1.114 2023/12/15 15:12:08 deraadt Exp $ */ 2 /* $NetBSD: kern_ktrace.c,v 1.23 1996/02/09 18:59:36 christos Exp $ */ 3 4 /* 5 * Copyright (c) 1989, 1993 6 * The Regents of the University of California. All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. Neither the name of the University nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 * 32 * @(#)kern_ktrace.c 8.2 (Berkeley) 9/23/93 33 */ 34 35 #include <sys/param.h> 36 #include <sys/systm.h> 37 #include <sys/proc.h> 38 #include <sys/sched.h> 39 #include <sys/fcntl.h> 40 #include <sys/namei.h> 41 #include <sys/vnode.h> 42 #include <sys/lock.h> 43 #include <sys/ktrace.h> 44 #include <sys/malloc.h> 45 #include <sys/syslog.h> 46 #include <sys/sysctl.h> 47 #include <sys/pledge.h> 48 49 #include <sys/mount.h> 50 #include <sys/syscall.h> 51 #include <sys/syscallargs.h> 52 53 void ktrinitheaderraw(struct ktr_header *, uint, pid_t, pid_t); 54 void ktrinitheader(struct ktr_header *, struct proc *, int); 55 int ktrstart(struct proc *, struct vnode *, struct ucred *); 56 int ktrops(struct proc *, struct process *, int, int, struct vnode *, 57 struct ucred *); 58 int ktrsetchildren(struct proc *, struct process *, int, int, 59 struct vnode *, struct ucred *); 60 int ktrwrite(struct proc *, struct ktr_header *, const void *, size_t); 61 int ktrwrite2(struct proc *, struct ktr_header *, const void *, size_t, 62 const void *, size_t); 63 int ktrwriteraw(struct proc *, struct vnode *, struct ucred *, 64 struct ktr_header *, struct iovec *); 65 int ktrcanset(struct proc *, struct process *); 66 67 /* 68 * Clear the trace settings in a correct way (to avoid races). 69 */ 70 void 71 ktrcleartrace(struct process *pr) 72 { 73 struct vnode *vp; 74 struct ucred *cred; 75 76 if (pr->ps_tracevp != NULL) { 77 vp = pr->ps_tracevp; 78 cred = pr->ps_tracecred; 79 80 pr->ps_traceflag = 0; 81 pr->ps_tracevp = NULL; 82 pr->ps_tracecred = NULL; 83 84 vp->v_writecount--; 85 vrele(vp); 86 crfree(cred); 87 } 88 } 89 90 /* 91 * Change the trace setting in a correct way (to avoid races). 92 */ 93 void 94 ktrsettrace(struct process *pr, int facs, struct vnode *newvp, 95 struct ucred *newcred) 96 { 97 struct vnode *oldvp; 98 struct ucred *oldcred; 99 100 KASSERT(newvp != NULL); 101 KASSERT(newcred != NULL); 102 103 pr->ps_traceflag |= facs; 104 105 /* nothing to change about where the trace goes? */ 106 if (pr->ps_tracevp == newvp && pr->ps_tracecred == newcred) 107 return; 108 109 vref(newvp); 110 crhold(newcred); 111 newvp->v_writecount++; 112 113 oldvp = pr->ps_tracevp; 114 oldcred = pr->ps_tracecred; 115 116 pr->ps_tracevp = newvp; 117 pr->ps_tracecred = newcred; 118 119 if (oldvp != NULL) { 120 oldvp->v_writecount--; 121 vrele(oldvp); 122 crfree(oldcred); 123 } 124 } 125 126 void 127 ktrinitheaderraw(struct ktr_header *kth, uint type, pid_t pid, pid_t tid) 128 { 129 memset(kth, 0, sizeof(struct ktr_header)); 130 kth->ktr_type = type; 131 kth->ktr_pid = pid; 132 kth->ktr_tid = tid; 133 } 134 135 void 136 ktrinitheader(struct ktr_header *kth, struct proc *p, int type) 137 { 138 struct process *pr = p->p_p; 139 140 ktrinitheaderraw(kth, type, pr->ps_pid, p->p_tid + THREAD_PID_OFFSET); 141 memcpy(kth->ktr_comm, pr->ps_comm, sizeof(kth->ktr_comm)); 142 } 143 144 int 145 ktrstart(struct proc *p, struct vnode *vp, struct ucred *cred) 146 { 147 struct ktr_header kth; 148 149 ktrinitheaderraw(&kth, htobe32(KTR_START), -1, -1); 150 return (ktrwriteraw(p, vp, cred, &kth, NULL)); 151 } 152 153 void 154 ktrsyscall(struct proc *p, register_t code, size_t argsize, register_t args[]) 155 { 156 struct ktr_header kth; 157 struct ktr_syscall *ktp; 158 size_t len = sizeof(struct ktr_syscall) + argsize; 159 register_t *argp; 160 u_int nargs = 0; 161 int i; 162 163 if (code == SYS_sysctl) { 164 /* 165 * The sysctl encoding stores the mib[] 166 * array because it is interesting. 167 */ 168 if (args[1] > 0) 169 nargs = lmin(args[1], CTL_MAXNAME); 170 len += nargs * sizeof(int); 171 } 172 atomic_setbits_int(&p->p_flag, P_INKTR); 173 ktrinitheader(&kth, p, KTR_SYSCALL); 174 ktp = malloc(len, M_TEMP, M_WAITOK); 175 ktp->ktr_code = code; 176 ktp->ktr_argsize = argsize; 177 argp = (register_t *)((char *)ktp + sizeof(struct ktr_syscall)); 178 for (i = 0; i < (argsize / sizeof *argp); i++) 179 *argp++ = args[i]; 180 if (nargs && copyin((void *)args[0], argp, nargs * sizeof(int))) 181 memset(argp, 0, nargs * sizeof(int)); 182 ktrwrite(p, &kth, ktp, len); 183 free(ktp, M_TEMP, len); 184 atomic_clearbits_int(&p->p_flag, P_INKTR); 185 } 186 187 void 188 ktrsysret(struct proc *p, register_t code, int error, 189 const register_t retval[2]) 190 { 191 struct ktr_header kth; 192 struct ktr_sysret ktp; 193 int len; 194 195 atomic_setbits_int(&p->p_flag, P_INKTR); 196 ktrinitheader(&kth, p, KTR_SYSRET); 197 ktp.ktr_code = code; 198 ktp.ktr_error = error; 199 if (error) 200 len = 0; 201 else if (code == SYS_lseek) 202 /* the one exception: lseek on ILP32 needs more */ 203 len = sizeof(long long); 204 else 205 len = sizeof(register_t); 206 ktrwrite2(p, &kth, &ktp, sizeof(ktp), retval, len); 207 atomic_clearbits_int(&p->p_flag, P_INKTR); 208 } 209 210 void 211 ktrnamei(struct proc *p, char *path) 212 { 213 struct ktr_header kth; 214 215 atomic_setbits_int(&p->p_flag, P_INKTR); 216 ktrinitheader(&kth, p, KTR_NAMEI); 217 ktrwrite(p, &kth, path, strlen(path)); 218 atomic_clearbits_int(&p->p_flag, P_INKTR); 219 } 220 221 void 222 ktrgenio(struct proc *p, int fd, enum uio_rw rw, struct iovec *iov, 223 ssize_t len) 224 { 225 struct ktr_header kth; 226 struct ktr_genio ktp; 227 caddr_t cp; 228 int count, error; 229 int buflen; 230 231 atomic_setbits_int(&p->p_flag, P_INKTR); 232 233 /* beware overflow */ 234 if (len > PAGE_SIZE) 235 buflen = PAGE_SIZE; 236 else 237 buflen = len + sizeof(struct ktr_genio); 238 239 ktrinitheader(&kth, p, KTR_GENIO); 240 ktp.ktr_fd = fd; 241 ktp.ktr_rw = rw; 242 243 cp = malloc(buflen, M_TEMP, M_WAITOK); 244 while (len > 0) { 245 /* 246 * Don't allow this process to hog the cpu when doing 247 * huge I/O. 248 */ 249 sched_pause(preempt); 250 251 count = lmin(iov->iov_len, buflen); 252 if (count > len) 253 count = len; 254 if (copyin(iov->iov_base, cp, count)) 255 break; 256 257 KERNEL_LOCK(); 258 error = ktrwrite2(p, &kth, &ktp, sizeof(ktp), cp, count); 259 KERNEL_UNLOCK(); 260 if (error != 0) 261 break; 262 263 iov->iov_len -= count; 264 iov->iov_base = (caddr_t)iov->iov_base + count; 265 266 if (iov->iov_len == 0) 267 iov++; 268 269 len -= count; 270 } 271 272 free(cp, M_TEMP, buflen); 273 atomic_clearbits_int(&p->p_flag, P_INKTR); 274 } 275 276 void 277 ktrpsig(struct proc *p, int sig, sig_t action, int mask, int code, 278 siginfo_t *si) 279 { 280 struct ktr_header kth; 281 struct ktr_psig kp; 282 283 atomic_setbits_int(&p->p_flag, P_INKTR); 284 ktrinitheader(&kth, p, KTR_PSIG); 285 kp.signo = (char)sig; 286 kp.action = action; 287 kp.mask = mask; 288 kp.code = code; 289 kp.si = *si; 290 291 KERNEL_LOCK(); 292 ktrwrite(p, &kth, &kp, sizeof(kp)); 293 KERNEL_UNLOCK(); 294 atomic_clearbits_int(&p->p_flag, P_INKTR); 295 } 296 297 void 298 ktrstruct(struct proc *p, const char *name, const void *data, size_t datalen) 299 { 300 struct ktr_header kth; 301 302 atomic_setbits_int(&p->p_flag, P_INKTR); 303 ktrinitheader(&kth, p, KTR_STRUCT); 304 305 if (data == NULL) 306 datalen = 0; 307 KERNEL_LOCK(); 308 ktrwrite2(p, &kth, name, strlen(name) + 1, data, datalen); 309 KERNEL_UNLOCK(); 310 atomic_clearbits_int(&p->p_flag, P_INKTR); 311 } 312 313 int 314 ktruser(struct proc *p, const char *id, const void *addr, size_t len) 315 { 316 struct ktr_header kth; 317 struct ktr_user ktp; 318 int error; 319 void *memp; 320 #define STK_PARAMS 128 321 long long stkbuf[STK_PARAMS / sizeof(long long)]; 322 323 if (!KTRPOINT(p, KTR_USER)) 324 return (0); 325 if (len > KTR_USER_MAXLEN) 326 return (EINVAL); 327 328 atomic_setbits_int(&p->p_flag, P_INKTR); 329 ktrinitheader(&kth, p, KTR_USER); 330 memset(ktp.ktr_id, 0, KTR_USER_MAXIDLEN); 331 error = copyinstr(id, ktp.ktr_id, KTR_USER_MAXIDLEN, NULL); 332 if (error == 0) { 333 if (len > sizeof(stkbuf)) 334 memp = malloc(len, M_TEMP, M_WAITOK); 335 else 336 memp = stkbuf; 337 error = copyin(addr, memp, len); 338 if (error == 0) { 339 KERNEL_LOCK(); 340 ktrwrite2(p, &kth, &ktp, sizeof(ktp), memp, len); 341 KERNEL_UNLOCK(); 342 } 343 if (memp != stkbuf) 344 free(memp, M_TEMP, len); 345 } 346 atomic_clearbits_int(&p->p_flag, P_INKTR); 347 return (error); 348 } 349 350 void 351 ktrexec(struct proc *p, int type, const char *data, ssize_t len) 352 { 353 struct ktr_header kth; 354 int count; 355 int buflen; 356 357 assert(type == KTR_EXECARGS || type == KTR_EXECENV); 358 atomic_setbits_int(&p->p_flag, P_INKTR); 359 360 /* beware overflow */ 361 if (len > PAGE_SIZE) 362 buflen = PAGE_SIZE; 363 else 364 buflen = len; 365 366 ktrinitheader(&kth, p, type); 367 368 while (len > 0) { 369 /* 370 * Don't allow this process to hog the cpu when doing 371 * huge I/O. 372 */ 373 sched_pause(preempt); 374 375 count = lmin(len, buflen); 376 if (ktrwrite(p, &kth, data, count) != 0) 377 break; 378 379 len -= count; 380 data += count; 381 } 382 383 atomic_clearbits_int(&p->p_flag, P_INKTR); 384 } 385 386 void 387 ktrpledge(struct proc *p, int error, uint64_t code, int syscall) 388 { 389 struct ktr_header kth; 390 struct ktr_pledge kp; 391 392 atomic_setbits_int(&p->p_flag, P_INKTR); 393 ktrinitheader(&kth, p, KTR_PLEDGE); 394 kp.error = error; 395 kp.code = code; 396 kp.syscall = syscall; 397 398 KERNEL_LOCK(); 399 ktrwrite(p, &kth, &kp, sizeof(kp)); 400 KERNEL_UNLOCK(); 401 atomic_clearbits_int(&p->p_flag, P_INKTR); 402 } 403 404 void 405 ktrpinsyscall(struct proc *p, int error, int syscall, vaddr_t addr) 406 { 407 struct ktr_header kth; 408 struct ktr_pinsyscall kp; 409 410 atomic_setbits_int(&p->p_flag, P_INKTR); 411 ktrinitheader(&kth, p, KTR_PINSYSCALL); 412 kp.error = error; 413 kp.syscall = syscall; 414 kp.addr = addr; 415 416 KERNEL_LOCK(); 417 ktrwrite(p, &kth, &kp, sizeof(kp)); 418 KERNEL_UNLOCK(); 419 atomic_clearbits_int(&p->p_flag, P_INKTR); 420 } 421 422 /* Interface and common routines */ 423 424 int 425 doktrace(struct vnode *vp, int ops, int facs, pid_t pid, struct proc *p) 426 { 427 struct process *pr = NULL; 428 struct ucred *cred = NULL; 429 struct pgrp *pg; 430 int descend = ops & KTRFLAG_DESCEND; 431 int ret = 0; 432 int error = 0; 433 434 facs = facs & ~((unsigned)KTRFAC_ROOT); 435 ops = KTROP(ops); 436 437 if (ops != KTROP_CLEAR) { 438 /* 439 * an operation which requires a file argument. 440 */ 441 cred = p->p_ucred; 442 if (!vp) { 443 error = EINVAL; 444 goto done; 445 } 446 if (vp->v_type != VREG) { 447 error = EACCES; 448 goto done; 449 } 450 } 451 /* 452 * Clear all uses of the tracefile 453 */ 454 if (ops == KTROP_CLEARFILE) { 455 LIST_FOREACH(pr, &allprocess, ps_list) { 456 if (pr->ps_tracevp == vp) { 457 if (ktrcanset(p, pr)) 458 ktrcleartrace(pr); 459 else 460 error = EPERM; 461 } 462 } 463 goto done; 464 } 465 /* 466 * need something to (un)trace (XXX - why is this here?) 467 */ 468 if (!facs) { 469 error = EINVAL; 470 goto done; 471 } 472 if (ops == KTROP_SET) { 473 if (suser(p) == 0) 474 facs |= KTRFAC_ROOT; 475 error = ktrstart(p, vp, cred); 476 if (error != 0) 477 goto done; 478 } 479 /* 480 * do it 481 */ 482 if (pid < 0) { 483 /* 484 * by process group 485 */ 486 pg = pgfind(-pid); 487 if (pg == NULL) { 488 error = ESRCH; 489 goto done; 490 } 491 LIST_FOREACH(pr, &pg->pg_members, ps_pglist) { 492 if (descend) 493 ret |= ktrsetchildren(p, pr, ops, facs, vp, 494 cred); 495 else 496 ret |= ktrops(p, pr, ops, facs, vp, cred); 497 } 498 } else { 499 /* 500 * by pid 501 */ 502 pr = prfind(pid); 503 if (pr == NULL) { 504 error = ESRCH; 505 goto done; 506 } 507 if (descend) 508 ret |= ktrsetchildren(p, pr, ops, facs, vp, cred); 509 else 510 ret |= ktrops(p, pr, ops, facs, vp, cred); 511 } 512 if (!ret) 513 error = EPERM; 514 done: 515 return (error); 516 } 517 518 /* 519 * ktrace system call 520 */ 521 int 522 sys_ktrace(struct proc *p, void *v, register_t *retval) 523 { 524 struct sys_ktrace_args /* { 525 syscallarg(const char *) fname; 526 syscallarg(int) ops; 527 syscallarg(int) facs; 528 syscallarg(pid_t) pid; 529 } */ *uap = v; 530 struct vnode *vp = NULL; 531 const char *fname = SCARG(uap, fname); 532 struct ucred *cred = NULL; 533 int error; 534 535 if (fname) { 536 struct nameidata nd; 537 538 cred = p->p_ucred; 539 NDINIT(&nd, 0, 0, UIO_USERSPACE, fname, p); 540 nd.ni_pledge = PLEDGE_CPATH | PLEDGE_WPATH; 541 nd.ni_unveil = UNVEIL_CREATE | UNVEIL_WRITE; 542 if ((error = vn_open(&nd, FWRITE|O_NOFOLLOW, 0)) != 0) 543 return error; 544 vp = nd.ni_vp; 545 546 VOP_UNLOCK(vp); 547 } 548 549 error = doktrace(vp, SCARG(uap, ops), SCARG(uap, facs), 550 SCARG(uap, pid), p); 551 if (vp != NULL) 552 (void)vn_close(vp, FWRITE, cred, p); 553 554 return error; 555 } 556 557 int 558 ktrops(struct proc *curp, struct process *pr, int ops, int facs, 559 struct vnode *vp, struct ucred *cred) 560 { 561 if (!ktrcanset(curp, pr)) 562 return (0); 563 if (ops == KTROP_SET) 564 ktrsettrace(pr, facs, vp, cred); 565 else { 566 /* KTROP_CLEAR */ 567 pr->ps_traceflag &= ~facs; 568 if ((pr->ps_traceflag & KTRFAC_MASK) == 0) { 569 /* cleared all the facility bits, so stop completely */ 570 ktrcleartrace(pr); 571 } 572 } 573 574 return (1); 575 } 576 577 int 578 ktrsetchildren(struct proc *curp, struct process *top, int ops, int facs, 579 struct vnode *vp, struct ucred *cred) 580 { 581 struct process *pr; 582 int ret = 0; 583 584 pr = top; 585 for (;;) { 586 ret |= ktrops(curp, pr, ops, facs, vp, cred); 587 /* 588 * If this process has children, descend to them next, 589 * otherwise do any siblings, and if done with this level, 590 * follow back up the tree (but not past top). 591 */ 592 if (!LIST_EMPTY(&pr->ps_children)) 593 pr = LIST_FIRST(&pr->ps_children); 594 else for (;;) { 595 if (pr == top) 596 return (ret); 597 if (LIST_NEXT(pr, ps_sibling) != NULL) { 598 pr = LIST_NEXT(pr, ps_sibling); 599 break; 600 } 601 pr = pr->ps_pptr; 602 } 603 } 604 /*NOTREACHED*/ 605 } 606 607 int 608 ktrwrite(struct proc *p, struct ktr_header *kth, const void *aux, size_t len) 609 { 610 struct vnode *vp = p->p_p->ps_tracevp; 611 struct ucred *cred = p->p_p->ps_tracecred; 612 struct iovec data[2]; 613 int error; 614 615 if (vp == NULL) 616 return 0; 617 crhold(cred); 618 data[0].iov_base = (void *)aux; 619 data[0].iov_len = len; 620 data[1].iov_len = 0; 621 kth->ktr_len = len; 622 error = ktrwriteraw(p, vp, cred, kth, data); 623 crfree(cred); 624 return (error); 625 } 626 627 int 628 ktrwrite2(struct proc *p, struct ktr_header *kth, const void *aux1, 629 size_t len1, const void *aux2, size_t len2) 630 { 631 struct vnode *vp = p->p_p->ps_tracevp; 632 struct ucred *cred = p->p_p->ps_tracecred; 633 struct iovec data[2]; 634 int error; 635 636 if (vp == NULL) 637 return 0; 638 crhold(cred); 639 data[0].iov_base = (void *)aux1; 640 data[0].iov_len = len1; 641 data[1].iov_base = (void *)aux2; 642 data[1].iov_len = len2; 643 kth->ktr_len = len1 + len2; 644 error = ktrwriteraw(p, vp, cred, kth, data); 645 crfree(cred); 646 return (error); 647 } 648 649 int 650 ktrwriteraw(struct proc *curp, struct vnode *vp, struct ucred *cred, 651 struct ktr_header *kth, struct iovec *data) 652 { 653 struct uio auio; 654 struct iovec aiov[3]; 655 struct process *pr; 656 int error; 657 658 nanotime(&kth->ktr_time); 659 660 KERNEL_ASSERT_LOCKED(); 661 662 auio.uio_iov = &aiov[0]; 663 auio.uio_offset = 0; 664 auio.uio_segflg = UIO_SYSSPACE; 665 auio.uio_rw = UIO_WRITE; 666 aiov[0].iov_base = (caddr_t)kth; 667 aiov[0].iov_len = sizeof(struct ktr_header); 668 auio.uio_resid = sizeof(struct ktr_header); 669 auio.uio_iovcnt = 1; 670 auio.uio_procp = curp; 671 if (kth->ktr_len > 0) { 672 aiov[1] = data[0]; 673 aiov[2] = data[1]; 674 auio.uio_iovcnt++; 675 if (aiov[2].iov_len > 0) 676 auio.uio_iovcnt++; 677 auio.uio_resid += kth->ktr_len; 678 } 679 error = vget(vp, LK_EXCLUSIVE | LK_RETRY); 680 if (error) 681 goto bad; 682 error = VOP_WRITE(vp, &auio, IO_UNIT|IO_APPEND, cred); 683 vput(vp); 684 if (error) 685 goto bad; 686 687 return (0); 688 689 bad: 690 /* 691 * If error encountered, give up tracing on this vnode. 692 */ 693 log(LOG_NOTICE, "ktrace write failed, errno %d, tracing stopped\n", 694 error); 695 LIST_FOREACH(pr, &allprocess, ps_list) { 696 if (pr == curp->p_p) 697 continue; 698 if (pr->ps_tracevp == vp && pr->ps_tracecred == cred) 699 ktrcleartrace(pr); 700 } 701 ktrcleartrace(curp->p_p); 702 return (error); 703 } 704 705 /* 706 * Return true if caller has permission to set the ktracing state 707 * of target. Essentially, the target can't possess any 708 * more permissions than the caller. KTRFAC_ROOT signifies that 709 * root previously set the tracing status on the target process, and 710 * so, only root may further change it. 711 * 712 * TODO: check groups. use caller effective gid. 713 */ 714 int 715 ktrcanset(struct proc *callp, struct process *targetpr) 716 { 717 struct ucred *caller = callp->p_ucred; 718 struct ucred *target = targetpr->ps_ucred; 719 720 if ((caller->cr_uid == target->cr_ruid && 721 target->cr_ruid == target->cr_svuid && 722 caller->cr_rgid == target->cr_rgid && /* XXX */ 723 target->cr_rgid == target->cr_svgid && 724 (targetpr->ps_traceflag & KTRFAC_ROOT) == 0 && 725 !ISSET(targetpr->ps_flags, PS_SUGID)) || 726 caller->cr_uid == 0) 727 return (1); 728 729 return (0); 730 } 731