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kern_ktrace.c revision 1.33.8.1 
      1 /*	$NetBSD: kern_ktrace.c,v 1.33.8.1 1999/06/21 01:24:01 thorpej Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 1989, 1993
      5  *	The Regents of the University of California.  All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  * 3. All advertising materials mentioning features or use of this software
     16  *    must display the following acknowledgement:
     17  *	This product includes software developed by the University of
     18  *	California, Berkeley and its contributors.
     19  * 4. Neither the name of the University nor the names of its contributors
     20  *    may be used to endorse or promote products derived from this software
     21  *    without specific prior written permission.
     22  *
     23  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     33  * SUCH DAMAGE.
     34  *
     35  *	@(#)kern_ktrace.c	8.5 (Berkeley) 5/14/95
     36  */
     37 
     38 #include "opt_ktrace.h"
     39 
     40 #ifdef KTRACE
     41 
     42 #include <sys/param.h>
     43 #include <sys/systm.h>
     44 #include <sys/proc.h>
     45 #include <sys/file.h>
     46 #include <sys/namei.h>
     47 #include <sys/vnode.h>
     48 #include <sys/ktrace.h>
     49 #include <sys/malloc.h>
     50 #include <sys/syslog.h>
     51 #include <sys/filedesc.h>
     52 
     53 #include <sys/mount.h>
     54 #include <sys/syscallargs.h>
     55 
     56 struct ktr_header *ktrgetheader __P((int));
     57 int ktrops __P((struct proc *, struct proc *, int, int, void *));
     58 int ktrsetchildren __P((struct proc *, struct proc *, int, int, void *));
     59 void ktrwrite __P((struct proc *, void *, struct ktr_header *));
     60 int ktrcanset __P((struct proc *, struct proc *));
     61 
     62 void
     63 ktrderef(p)
     64 	struct proc *p;
     65 {
     66 	if (p->p_tracep == NULL)
     67 		return;
     68 
     69 	if (p->p_traceflag & KTRFAC_FD) {
     70 		struct file *fp = p->p_tracep;
     71 
     72 		FILE_USE(fp);
     73 		closef(fp, NULL);
     74 	} else {
     75 		struct vnode *vp = p->p_tracep;
     76 
     77 		vrele(vp);
     78 	}
     79 	p->p_tracep = NULL;
     80 	p->p_traceflag = 0;
     81 }
     82 
     83 void
     84 ktradref(p)
     85 	struct proc *p;
     86 {
     87 	if (p->p_traceflag & KTRFAC_FD) {
     88 		struct file *fp = p->p_tracep;
     89 
     90 		fp->f_count++;
     91 	} else {
     92 		struct vnode *vp = p->p_tracep;
     93 
     94 		VREF(vp);
     95 	}
     96 }
     97 
     98 struct ktr_header *
     99 ktrgetheader(type)
    100 	int type;
    101 {
    102 	struct ktr_header *kth;
    103 	struct proc *p = curproc;	/* XXX */
    104 
    105 	MALLOC(kth, struct ktr_header *, sizeof(struct ktr_header),
    106 		M_TEMP, M_WAITOK);
    107 	kth->ktr_type = type;
    108 	microtime(&kth->ktr_time);
    109 	kth->ktr_pid = p->p_pid;
    110 	memcpy(kth->ktr_comm, p->p_comm, MAXCOMLEN);
    111 	/* Note: ktr_len and ktr_buf are left to be filled in by the caller. */
    112 	return (kth);
    113 }
    114 
    115 void
    116 ktrsyscall(v, code, argsize, args)
    117 	void *v;
    118 	register_t code;
    119 	size_t argsize;
    120 	register_t args[];
    121 {
    122 	struct	ktr_header *kth;
    123 	struct	ktr_syscall *ktp;
    124 	struct proc *p = curproc;	/* XXX */
    125 	register_t *argp;
    126 	int	len = sizeof(struct ktr_syscall) + argsize;
    127 	int i;
    128 
    129 	p->p_traceflag |= KTRFAC_ACTIVE;
    130 	kth = ktrgetheader(KTR_SYSCALL);
    131 	MALLOC(ktp, struct ktr_syscall *, len, M_TEMP, M_WAITOK);
    132 	ktp->ktr_code = code;
    133 	ktp->ktr_argsize = argsize;
    134 	argp = (register_t *)((char *)ktp + sizeof(struct ktr_syscall));
    135 	for (i = 0; i < (argsize / sizeof(*argp)); i++)
    136 		*argp++ = args[i];
    137 	kth->ktr_buf = (caddr_t)ktp;
    138 	kth->ktr_len = len;
    139 	ktrwrite(p, v, kth);
    140 	FREE(ktp, M_TEMP);
    141 	FREE(kth, M_TEMP);
    142 	p->p_traceflag &= ~KTRFAC_ACTIVE;
    143 }
    144 
    145 void
    146 ktrsysret(v, code, error, retval)
    147 	void *v;
    148 	register_t code;
    149 	int error;
    150 	register_t retval;
    151 {
    152 	struct ktr_header *kth;
    153 	struct ktr_sysret ktp;
    154 	struct proc *p = curproc;	/* XXX */
    155 
    156 	p->p_traceflag |= KTRFAC_ACTIVE;
    157 	kth = ktrgetheader(KTR_SYSRET);
    158 	ktp.ktr_code = code;
    159 	ktp.ktr_eosys = 0;			/* XXX unused */
    160 	ktp.ktr_error = error;
    161 	ktp.ktr_retval = retval;		/* what about val2 ? */
    162 
    163 	kth->ktr_buf = (caddr_t)&ktp;
    164 	kth->ktr_len = sizeof(struct ktr_sysret);
    165 
    166 	ktrwrite(p, v, kth);
    167 	FREE(kth, M_TEMP);
    168 	p->p_traceflag &= ~KTRFAC_ACTIVE;
    169 }
    170 
    171 void
    172 ktrnamei(v, path)
    173 	void *v;
    174 	char *path;
    175 {
    176 	struct ktr_header *kth;
    177 	struct proc *p = curproc;	/* XXX */
    178 
    179 	p->p_traceflag |= KTRFAC_ACTIVE;
    180 	kth = ktrgetheader(KTR_NAMEI);
    181 	kth->ktr_len = strlen(path);
    182 	kth->ktr_buf = path;
    183 
    184 	ktrwrite(p, v, kth);
    185 	FREE(kth, M_TEMP);
    186 	p->p_traceflag &= ~KTRFAC_ACTIVE;
    187 }
    188 
    189 void
    190 ktremul(v, p, emul)
    191 	void *v;
    192 	struct proc *p;
    193 	char *emul;
    194 {
    195 	struct ktr_header *kth;
    196 
    197 	p->p_traceflag |= KTRFAC_ACTIVE;
    198 	kth = ktrgetheader(KTR_EMUL);
    199 	kth->ktr_len = strlen(emul);
    200 	kth->ktr_buf = emul;
    201 
    202 	ktrwrite(p, v, kth);
    203 	FREE(kth, M_TEMP);
    204 	p->p_traceflag &= ~KTRFAC_ACTIVE;
    205 }
    206 
    207 void
    208 ktrgenio(v, fd, rw, iov, len, error)
    209 	void *v;
    210 	int fd;
    211 	enum uio_rw rw;
    212 	struct iovec *iov;
    213 	int len, error;
    214 {
    215 	struct ktr_header *kth;
    216 	struct ktr_genio *ktp;
    217 	caddr_t cp;
    218 	int resid = len, cnt;
    219 	struct proc *p = curproc;	/* XXX */
    220 
    221 	if (error)
    222 		return;
    223 	p->p_traceflag |= KTRFAC_ACTIVE;
    224 	kth = ktrgetheader(KTR_GENIO);
    225 	MALLOC(ktp, struct ktr_genio *, sizeof(struct ktr_genio) + len,
    226 		M_TEMP, M_WAITOK);
    227 	ktp->ktr_fd = fd;
    228 	ktp->ktr_rw = rw;
    229 	cp = (caddr_t)((char *)ktp + sizeof(struct ktr_genio));
    230 	while (resid > 0) {
    231 		if ((cnt = iov->iov_len) > resid)
    232 			cnt = resid;
    233 		if (copyin(iov->iov_base, cp, (unsigned)cnt))
    234 			goto done;
    235 		cp += cnt;
    236 		resid -= cnt;
    237 		iov++;
    238 	}
    239 	kth->ktr_buf = (caddr_t)ktp;
    240 	kth->ktr_len = sizeof(struct ktr_genio) + len;
    241 
    242 	ktrwrite(p, v, kth);
    243 done:
    244 	FREE(kth, M_TEMP);
    245 	FREE(ktp, M_TEMP);
    246 	p->p_traceflag &= ~KTRFAC_ACTIVE;
    247 }
    248 
    249 void
    250 ktrpsig(v, sig, action, mask, code)
    251 	void *v;
    252 	int sig;
    253 	sig_t action;
    254 	sigset_t *mask;
    255 	int code;
    256 {
    257 	struct ktr_header *kth;
    258 	struct ktr_psig	kp;
    259 	struct proc *p = curproc;	/* XXX */
    260 
    261 	p->p_traceflag |= KTRFAC_ACTIVE;
    262 	kth = ktrgetheader(KTR_PSIG);
    263 	kp.signo = (char)sig;
    264 	kp.action = action;
    265 	kp.mask = *mask;
    266 	kp.code = code;
    267 	kth->ktr_buf = (caddr_t)&kp;
    268 	kth->ktr_len = sizeof(struct ktr_psig);
    269 
    270 	ktrwrite(p, v, kth);
    271 	FREE(kth, M_TEMP);
    272 	p->p_traceflag &= ~KTRFAC_ACTIVE;
    273 }
    274 
    275 void
    276 ktrcsw(v, out, user)
    277 	void *v;
    278 	int out, user;
    279 {
    280 	struct ktr_header *kth;
    281 	struct	ktr_csw kc;
    282 	struct proc *p = curproc;	/* XXX */
    283 
    284 	p->p_traceflag |= KTRFAC_ACTIVE;
    285 	kth = ktrgetheader(KTR_CSW);
    286 	kc.out = out;
    287 	kc.user = user;
    288 	kth->ktr_buf = (caddr_t)&kc;
    289 	kth->ktr_len = sizeof(struct ktr_csw);
    290 
    291 	ktrwrite(p, v, kth);
    292 	FREE(kth, M_TEMP);
    293 	p->p_traceflag &= ~KTRFAC_ACTIVE;
    294 }
    295 
    296 /* Interface and common routines */
    297 
    298 /*
    299  * ktrace system call
    300  */
    301 /* ARGSUSED */
    302 int
    303 sys_fktrace(curp, v, retval)
    304 	struct proc *curp;
    305 	void *v;
    306 	register_t *retval;
    307 {
    308 	struct sys_fktrace_args /* {
    309 		syscallarg(int) fd;
    310 		syscallarg(int) ops;
    311 		syscallarg(int) facs;
    312 		syscallarg(int) pid;
    313 	} */ *uap = v;
    314 	struct file *fp = NULL;
    315 	struct proc *p;
    316 	struct filedesc *fdp = curp->p_fd;
    317 	struct pgrp *pg;
    318 	int facs;
    319 	int ops;
    320 	int descend;
    321 	int ret = 0;
    322 	int error = 0;
    323 
    324 	if (((u_int)SCARG(uap, fd)) >= fdp->fd_nfiles ||
    325 	    (fp = fdp->fd_ofiles[SCARG(uap, fd)]) == NULL ||
    326 	    (fp->f_flag & FWRITE) == 0)
    327 		return (EBADF);
    328 
    329 	ops = KTROP(SCARG(uap, ops)) | KTRFLAG_FD;
    330 	descend = SCARG(uap, ops) & KTRFLAG_DESCEND;
    331 	facs = SCARG(uap, facs) & ~((unsigned) KTRFAC_ROOT);
    332 	curp->p_traceflag |= KTRFAC_ACTIVE;
    333 
    334 	/*
    335 	 * Clear all uses of the tracefile
    336 	 */
    337 	if (KTROP(ops) == KTROP_CLEARFILE) {
    338 		for (p = allproc.lh_first; p != 0; p = p->p_list.le_next) {
    339 			if (p->p_tracep == fp) {
    340 				if (ktrcanset(curp, p))
    341 					ktrderef(p);
    342 				else
    343 					error = EPERM;
    344 			}
    345 		}
    346 		goto done;
    347 	}
    348 	/*
    349 	 * need something to (un)trace (XXX - why is this here?)
    350 	 */
    351 	if (!facs) {
    352 		error = EINVAL;
    353 		goto done;
    354 	}
    355 	/*
    356 	 * do it
    357 	 */
    358 	if (SCARG(uap, pid) < 0) {
    359 		/*
    360 		 * by process group
    361 		 */
    362 		pg = pgfind(-SCARG(uap, pid));
    363 		if (pg == NULL) {
    364 			error = ESRCH;
    365 			goto done;
    366 		}
    367 		for (p = pg->pg_members.lh_first; p != 0; p = p->p_pglist.le_next)
    368 			if (descend)
    369 				ret |= ktrsetchildren(curp, p, ops, facs, fp);
    370 			else
    371 				ret |= ktrops(curp, p, ops, facs, fp);
    372 
    373 	} else {
    374 		/*
    375 		 * by pid
    376 		 */
    377 		p = pfind(SCARG(uap, pid));
    378 		if (p == NULL) {
    379 			error = ESRCH;
    380 			goto done;
    381 		}
    382 		if (descend)
    383 			ret |= ktrsetchildren(curp, p, ops, facs, fp);
    384 		else
    385 			ret |= ktrops(curp, p, ops, facs, fp);
    386 	}
    387 	if (!ret)
    388 		error = EPERM;
    389 done:
    390 	curp->p_traceflag &= ~KTRFAC_ACTIVE;
    391 	return (error);
    392 }
    393 
    394 /*
    395  * ktrace system call
    396  */
    397 /* ARGSUSED */
    398 int
    399 sys_ktrace(curp, v, retval)
    400 	struct proc *curp;
    401 	void *v;
    402 	register_t *retval;
    403 {
    404 	struct sys_ktrace_args /* {
    405 		syscallarg(const char *) fname;
    406 		syscallarg(int) ops;
    407 		syscallarg(int) facs;
    408 		syscallarg(int) pid;
    409 	} */ *uap = v;
    410 	struct vnode *vp = NULL;
    411 	struct proc *p;
    412 	struct pgrp *pg;
    413 	int facs = SCARG(uap, facs) & ~((unsigned) KTRFAC_ROOT);
    414 	int ops = KTROP(SCARG(uap, ops));
    415 	int descend = SCARG(uap, ops) & KTRFLAG_DESCEND;
    416 	int ret = 0;
    417 	int error = 0;
    418 	struct nameidata nd;
    419 
    420 	curp->p_traceflag |= KTRFAC_ACTIVE;
    421 	if (ops != KTROP_CLEAR) {
    422 		/*
    423 		 * an operation which requires a file argument.
    424 		 */
    425 		NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, fname),
    426 		    curp);
    427 		if ((error = vn_open(&nd, FREAD|FWRITE, 0)) != 0) {
    428 			curp->p_traceflag &= ~KTRFAC_ACTIVE;
    429 			return (error);
    430 		}
    431 		vp = nd.ni_vp;
    432 		VOP_UNLOCK(vp, 0);
    433 		if (vp->v_type != VREG) {
    434 			(void) vn_close(vp, FREAD|FWRITE, curp->p_ucred, curp);
    435 			curp->p_traceflag &= ~KTRFAC_ACTIVE;
    436 			return (EACCES);
    437 		}
    438 	}
    439 	/*
    440 	 * Clear all uses of the tracefile
    441 	 */
    442 	if (KTROP(ops) == KTROP_CLEARFILE) {
    443 		for (p = allproc.lh_first; p != 0; p = p->p_list.le_next) {
    444 			if (p->p_tracep == vp &&
    445 			    !ktrops(curp, p, KTROP_CLEAR, ~0, vp))
    446 				error = EPERM;
    447 		}
    448 		goto done;
    449 	}
    450 	/*
    451 	 * need something to (un)trace (XXX - why is this here?)
    452 	 */
    453 	if (!facs) {
    454 		error = EINVAL;
    455 		goto done;
    456 	}
    457 	/*
    458 	 * do it
    459 	 */
    460 	if (SCARG(uap, pid) < 0) {
    461 		/*
    462 		 * by process group
    463 		 */
    464 		pg = pgfind(-SCARG(uap, pid));
    465 		if (pg == NULL) {
    466 			error = ESRCH;
    467 			goto done;
    468 		}
    469 		for (p = pg->pg_members.lh_first; p != 0; p = p->p_pglist.le_next)
    470 			if (descend)
    471 				ret |= ktrsetchildren(curp, p, ops, facs, vp);
    472 			else
    473 				ret |= ktrops(curp, p, ops, facs, vp);
    474 
    475 	} else {
    476 		/*
    477 		 * by pid
    478 		 */
    479 		p = pfind(SCARG(uap, pid));
    480 		if (p == NULL) {
    481 			error = ESRCH;
    482 			goto done;
    483 		}
    484 		if (descend)
    485 			ret |= ktrsetchildren(curp, p, ops, facs, vp);
    486 		else
    487 			ret |= ktrops(curp, p, ops, facs, vp);
    488 	}
    489 	if (!ret)
    490 		error = EPERM;
    491 done:
    492 	if (vp != NULL)
    493 		(void) vn_close(vp, FWRITE, curp->p_ucred, curp);
    494 	curp->p_traceflag &= ~KTRFAC_ACTIVE;
    495 	return (error);
    496 }
    497 
    498 int
    499 ktrops(curp, p, ops, facs, v)
    500 	struct proc *p, *curp;
    501 	int ops, facs;
    502 	void *v;
    503 {
    504 
    505 	if (!ktrcanset(curp, p))
    506 		return (0);
    507 	if (KTROP(ops) == KTROP_SET) {
    508 		if (p->p_tracep != v) {
    509 			/*
    510 			 * if trace file already in use, relinquish
    511 			 */
    512 			ktrderef(p);
    513 			if (ops & KTRFLAG_FD)
    514 				p->p_traceflag = KTRFAC_FD;
    515 			p->p_tracep = v;
    516 			ktradref(p);
    517 		}
    518 		p->p_traceflag |= facs;
    519 		if (curp->p_ucred->cr_uid == 0)
    520 			p->p_traceflag |= KTRFAC_ROOT;
    521 	} else {
    522 		/* KTROP_CLEAR */
    523 		if (((p->p_traceflag &= ~facs) & KTRFAC_MASK) == 0) {
    524 			/* no more tracing */
    525 			ktrderef(p);
    526 		}
    527 	}
    528 
    529 	/*
    530 	 * Emit an emulation record, every time there is a ktrace
    531 	 * change/attach request.
    532 	 */
    533 	if (KTRPOINT(p, KTR_EMUL))
    534 		ktremul(p->p_tracep, p, p->p_emul->e_name);
    535 
    536 	return (1);
    537 }
    538 
    539 int
    540 ktrsetchildren(curp, top, ops, facs, v)
    541 	struct proc *curp, *top;
    542 	int ops, facs;
    543 	void *v;
    544 {
    545 	struct proc *p;
    546 	int ret = 0;
    547 
    548 	p = top;
    549 	for (;;) {
    550 		ret |= ktrops(curp, p, ops, facs, v);
    551 		/*
    552 		 * If this process has children, descend to them next,
    553 		 * otherwise do any siblings, and if done with this level,
    554 		 * follow back up the tree (but not past top).
    555 		 */
    556 		if (p->p_children.lh_first)
    557 			p = p->p_children.lh_first;
    558 		else for (;;) {
    559 			if (p == top)
    560 				return (ret);
    561 			if (p->p_sibling.le_next) {
    562 				p = p->p_sibling.le_next;
    563 				break;
    564 			}
    565 			p = p->p_pptr;
    566 		}
    567 	}
    568 	/*NOTREACHED*/
    569 }
    570 
    571 void
    572 ktrwrite(p, v, kth)
    573 	struct proc *p;
    574 	void *v;
    575 	struct ktr_header *kth;
    576 {
    577 	struct uio auio;
    578 	struct iovec aiov[2];
    579 	int error;
    580 
    581 	if (v == NULL)
    582 		return;
    583 	auio.uio_iov = &aiov[0];
    584 	auio.uio_offset = 0;
    585 	auio.uio_segflg = UIO_SYSSPACE;
    586 	auio.uio_rw = UIO_WRITE;
    587 	aiov[0].iov_base = (caddr_t)kth;
    588 	aiov[0].iov_len = sizeof(struct ktr_header);
    589 	auio.uio_resid = sizeof(struct ktr_header);
    590 	auio.uio_iovcnt = 1;
    591 	auio.uio_procp = (struct proc *)0;
    592 	if (kth->ktr_len > 0) {
    593 		auio.uio_iovcnt++;
    594 		aiov[1].iov_base = kth->ktr_buf;
    595 		aiov[1].iov_len = kth->ktr_len;
    596 		auio.uio_resid += kth->ktr_len;
    597 	}
    598 	if (p->p_traceflag & KTRFAC_FD) {
    599 		struct file *fp = v;
    600 
    601 		FILE_USE(fp);
    602 		error = (*fp->f_ops->fo_write)(fp, &fp->f_offset, &auio,
    603 		    fp->f_cred, FOF_UPDATE_OFFSET);
    604 		FILE_UNUSE(fp, NULL);
    605 	}
    606 	else {
    607 		struct vnode *vp = v;
    608 
    609 		vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
    610 		error = VOP_WRITE(vp, &auio, IO_UNIT|IO_APPEND, p->p_ucred);
    611 		VOP_UNLOCK(vp, 0);
    612 	}
    613 	if (!error)
    614 		return;
    615 	/*
    616 	 * If error encountered, give up tracing on this vnode.
    617 	 */
    618 	log(LOG_NOTICE, "ktrace write failed, errno %d, tracing stopped\n",
    619 	    error);
    620 	for (p = allproc.lh_first; p != 0; p = p->p_list.le_next) {
    621 		if (p->p_tracep == v)
    622 			ktrderef(p);
    623 	}
    624 }
    625 
    626 /*
    627  * Return true if caller has permission to set the ktracing state
    628  * of target.  Essentially, the target can't possess any
    629  * more permissions than the caller.  KTRFAC_ROOT signifies that
    630  * root previously set the tracing status on the target process, and
    631  * so, only root may further change it.
    632  *
    633  * TODO: check groups.  use caller effective gid.
    634  */
    635 int
    636 ktrcanset(callp, targetp)
    637 	struct proc *callp, *targetp;
    638 {
    639 	struct pcred *caller = callp->p_cred;
    640 	struct pcred *target = targetp->p_cred;
    641 
    642 	if ((caller->pc_ucred->cr_uid == target->p_ruid &&
    643 	     target->p_ruid == target->p_svuid &&
    644 	     caller->p_rgid == target->p_rgid &&	/* XXX */
    645 	     target->p_rgid == target->p_svgid &&
    646 	     (targetp->p_traceflag & KTRFAC_ROOT) == 0) ||
    647 	     caller->pc_ucred->cr_uid == 0)
    648 		return (1);
    649 
    650 	return (0);
    651 }
    652 
    653 #endif
    654