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kern_ktrace.c revision 1.34 
      1 /*	$NetBSD: kern_ktrace.c,v 1.34 1999/04/11 18:44:00 kleink 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 		closef(fp, NULL);
     73 	} else {
     74 		struct vnode *vp = p->p_tracep;
     75 
     76 		vrele(vp);
     77 	}
     78 	p->p_tracep = NULL;
     79 	p->p_traceflag = 0;
     80 }
     81 
     82 void
     83 ktradref(p)
     84 	struct proc *p;
     85 {
     86 	if (p->p_traceflag & KTRFAC_FD) {
     87 		struct file *fp = p->p_tracep;
     88 
     89 		fp->f_count++;
     90 	} else {
     91 		struct vnode *vp = p->p_tracep;
     92 
     93 		VREF(vp);
     94 	}
     95 }
     96 
     97 struct ktr_header *
     98 ktrgetheader(type)
     99 	int type;
    100 {
    101 	struct ktr_header *kth;
    102 	struct proc *p = curproc;	/* XXX */
    103 
    104 	MALLOC(kth, struct ktr_header *, sizeof(struct ktr_header),
    105 		M_TEMP, M_WAITOK);
    106 	kth->ktr_type = type;
    107 	microtime(&kth->ktr_time);
    108 	kth->ktr_pid = p->p_pid;
    109 	memcpy(kth->ktr_comm, p->p_comm, MAXCOMLEN);
    110 	/* Note: ktr_len and ktr_buf are left to be filled in by the caller. */
    111 	return (kth);
    112 }
    113 
    114 void
    115 ktrsyscall(v, code, argsize, args)
    116 	void *v;
    117 	register_t code;
    118 	size_t argsize;
    119 	register_t args[];
    120 {
    121 	struct	ktr_header *kth;
    122 	struct	ktr_syscall *ktp;
    123 	struct proc *p = curproc;	/* XXX */
    124 	register_t *argp;
    125 	int	len = sizeof(struct ktr_syscall) + argsize;
    126 	int i;
    127 
    128 	p->p_traceflag |= KTRFAC_ACTIVE;
    129 	kth = ktrgetheader(KTR_SYSCALL);
    130 	MALLOC(ktp, struct ktr_syscall *, len, M_TEMP, M_WAITOK);
    131 	ktp->ktr_code = code;
    132 	ktp->ktr_argsize = argsize;
    133 	argp = (register_t *)((char *)ktp + sizeof(struct ktr_syscall));
    134 	for (i = 0; i < (argsize / sizeof(*argp)); i++)
    135 		*argp++ = args[i];
    136 	kth->ktr_buf = (caddr_t)ktp;
    137 	kth->ktr_len = len;
    138 	ktrwrite(p, v, kth);
    139 	FREE(ktp, M_TEMP);
    140 	FREE(kth, M_TEMP);
    141 	p->p_traceflag &= ~KTRFAC_ACTIVE;
    142 }
    143 
    144 void
    145 ktrsysret(v, code, error, retval)
    146 	void *v;
    147 	register_t code;
    148 	int error;
    149 	register_t retval;
    150 {
    151 	struct ktr_header *kth;
    152 	struct ktr_sysret ktp;
    153 	struct proc *p = curproc;	/* XXX */
    154 
    155 	p->p_traceflag |= KTRFAC_ACTIVE;
    156 	kth = ktrgetheader(KTR_SYSRET);
    157 	ktp.ktr_code = code;
    158 	ktp.ktr_eosys = 0;			/* XXX unused */
    159 	ktp.ktr_error = error;
    160 	ktp.ktr_retval = retval;		/* what about val2 ? */
    161 
    162 	kth->ktr_buf = (caddr_t)&ktp;
    163 	kth->ktr_len = sizeof(struct ktr_sysret);
    164 
    165 	ktrwrite(p, v, kth);
    166 	FREE(kth, M_TEMP);
    167 	p->p_traceflag &= ~KTRFAC_ACTIVE;
    168 }
    169 
    170 void
    171 ktrnamei(v, path)
    172 	void *v;
    173 	char *path;
    174 {
    175 	struct ktr_header *kth;
    176 	struct proc *p = curproc;	/* XXX */
    177 
    178 	p->p_traceflag |= KTRFAC_ACTIVE;
    179 	kth = ktrgetheader(KTR_NAMEI);
    180 	kth->ktr_len = strlen(path);
    181 	kth->ktr_buf = path;
    182 
    183 	ktrwrite(p, v, kth);
    184 	FREE(kth, M_TEMP);
    185 	p->p_traceflag &= ~KTRFAC_ACTIVE;
    186 }
    187 
    188 void
    189 ktremul(v, p, emul)
    190 	void *v;
    191 	struct proc *p;
    192 	char *emul;
    193 {
    194 	struct ktr_header *kth;
    195 
    196 	p->p_traceflag |= KTRFAC_ACTIVE;
    197 	kth = ktrgetheader(KTR_EMUL);
    198 	kth->ktr_len = strlen(emul);
    199 	kth->ktr_buf = emul;
    200 
    201 	ktrwrite(p, v, kth);
    202 	FREE(kth, M_TEMP);
    203 	p->p_traceflag &= ~KTRFAC_ACTIVE;
    204 }
    205 
    206 void
    207 ktrgenio(v, fd, rw, iov, len, error)
    208 	void *v;
    209 	int fd;
    210 	enum uio_rw rw;
    211 	struct iovec *iov;
    212 	int len, error;
    213 {
    214 	struct ktr_header *kth;
    215 	struct ktr_genio *ktp;
    216 	caddr_t cp;
    217 	int resid = len, cnt;
    218 	struct proc *p = curproc;	/* XXX */
    219 
    220 	if (error)
    221 		return;
    222 	p->p_traceflag |= KTRFAC_ACTIVE;
    223 	kth = ktrgetheader(KTR_GENIO);
    224 	MALLOC(ktp, struct ktr_genio *, sizeof(struct ktr_genio) + len,
    225 		M_TEMP, M_WAITOK);
    226 	ktp->ktr_fd = fd;
    227 	ktp->ktr_rw = rw;
    228 	cp = (caddr_t)((char *)ktp + sizeof(struct ktr_genio));
    229 	while (resid > 0) {
    230 		if ((cnt = iov->iov_len) > resid)
    231 			cnt = resid;
    232 		if (copyin(iov->iov_base, cp, (unsigned)cnt))
    233 			goto done;
    234 		cp += cnt;
    235 		resid -= cnt;
    236 		iov++;
    237 	}
    238 	kth->ktr_buf = (caddr_t)ktp;
    239 	kth->ktr_len = sizeof(struct ktr_genio) + len;
    240 
    241 	ktrwrite(p, v, kth);
    242 done:
    243 	FREE(kth, M_TEMP);
    244 	FREE(ktp, M_TEMP);
    245 	p->p_traceflag &= ~KTRFAC_ACTIVE;
    246 }
    247 
    248 void
    249 ktrpsig(v, sig, action, mask, code)
    250 	void *v;
    251 	int sig;
    252 	sig_t action;
    253 	sigset_t *mask;
    254 	int code;
    255 {
    256 	struct ktr_header *kth;
    257 	struct ktr_psig	kp;
    258 	struct proc *p = curproc;	/* XXX */
    259 
    260 	p->p_traceflag |= KTRFAC_ACTIVE;
    261 	kth = ktrgetheader(KTR_PSIG);
    262 	kp.signo = (char)sig;
    263 	kp.action = action;
    264 	kp.mask = *mask;
    265 	kp.code = code;
    266 	kth->ktr_buf = (caddr_t)&kp;
    267 	kth->ktr_len = sizeof(struct ktr_psig);
    268 
    269 	ktrwrite(p, v, kth);
    270 	FREE(kth, M_TEMP);
    271 	p->p_traceflag &= ~KTRFAC_ACTIVE;
    272 }
    273 
    274 void
    275 ktrcsw(v, out, user)
    276 	void *v;
    277 	int out, user;
    278 {
    279 	struct ktr_header *kth;
    280 	struct	ktr_csw kc;
    281 	struct proc *p = curproc;	/* XXX */
    282 
    283 	p->p_traceflag |= KTRFAC_ACTIVE;
    284 	kth = ktrgetheader(KTR_CSW);
    285 	kc.out = out;
    286 	kc.user = user;
    287 	kth->ktr_buf = (caddr_t)&kc;
    288 	kth->ktr_len = sizeof(struct ktr_csw);
    289 
    290 	ktrwrite(p, v, kth);
    291 	FREE(kth, M_TEMP);
    292 	p->p_traceflag &= ~KTRFAC_ACTIVE;
    293 }
    294 
    295 /* Interface and common routines */
    296 
    297 /*
    298  * ktrace system call
    299  */
    300 /* ARGSUSED */
    301 int
    302 sys_fktrace(curp, v, retval)
    303 	struct proc *curp;
    304 	void *v;
    305 	register_t *retval;
    306 {
    307 	struct sys_fktrace_args /* {
    308 		syscallarg(int) fd;
    309 		syscallarg(int) ops;
    310 		syscallarg(int) facs;
    311 		syscallarg(int) pid;
    312 	} */ *uap = v;
    313 	struct file *fp = NULL;
    314 	struct proc *p;
    315 	struct filedesc *fdp = curp->p_fd;
    316 	struct pgrp *pg;
    317 	int facs;
    318 	int ops;
    319 	int descend;
    320 	int ret = 0;
    321 	int error = 0;
    322 
    323 	if (((u_int)SCARG(uap, fd)) >= fdp->fd_nfiles ||
    324 	    (fp = fdp->fd_ofiles[SCARG(uap, fd)]) == NULL ||
    325 	    (fp->f_flag & FWRITE) == 0)
    326 		return (EBADF);
    327 
    328 	ops = KTROP(SCARG(uap, ops)) | KTRFLAG_FD;
    329 	descend = SCARG(uap, ops) & KTRFLAG_DESCEND;
    330 	facs = SCARG(uap, facs) & ~((unsigned) KTRFAC_ROOT);
    331 	curp->p_traceflag |= KTRFAC_ACTIVE;
    332 
    333 	/*
    334 	 * Clear all uses of the tracefile
    335 	 */
    336 	if (KTROP(ops) == KTROP_CLEARFILE) {
    337 		for (p = allproc.lh_first; p != 0; p = p->p_list.le_next) {
    338 			if (p->p_tracep == fp) {
    339 				if (ktrcanset(curp, p))
    340 					ktrderef(p);
    341 				else
    342 					error = EPERM;
    343 			}
    344 		}
    345 		goto done;
    346 	}
    347 	/*
    348 	 * need something to (un)trace (XXX - why is this here?)
    349 	 */
    350 	if (!facs) {
    351 		error = EINVAL;
    352 		goto done;
    353 	}
    354 	/*
    355 	 * do it
    356 	 */
    357 	if (SCARG(uap, pid) < 0) {
    358 		/*
    359 		 * by process group
    360 		 */
    361 		pg = pgfind(-SCARG(uap, pid));
    362 		if (pg == NULL) {
    363 			error = ESRCH;
    364 			goto done;
    365 		}
    366 		for (p = pg->pg_members.lh_first; p != 0; p = p->p_pglist.le_next)
    367 			if (descend)
    368 				ret |= ktrsetchildren(curp, p, ops, facs, fp);
    369 			else
    370 				ret |= ktrops(curp, p, ops, facs, fp);
    371 
    372 	} else {
    373 		/*
    374 		 * by pid
    375 		 */
    376 		p = pfind(SCARG(uap, pid));
    377 		if (p == NULL) {
    378 			error = ESRCH;
    379 			goto done;
    380 		}
    381 		if (descend)
    382 			ret |= ktrsetchildren(curp, p, ops, facs, fp);
    383 		else
    384 			ret |= ktrops(curp, p, ops, facs, fp);
    385 	}
    386 	if (!ret)
    387 		error = EPERM;
    388 done:
    389 	curp->p_traceflag &= ~KTRFAC_ACTIVE;
    390 	return (error);
    391 }
    392 
    393 /*
    394  * ktrace system call
    395  */
    396 /* ARGSUSED */
    397 int
    398 sys_ktrace(curp, v, retval)
    399 	struct proc *curp;
    400 	void *v;
    401 	register_t *retval;
    402 {
    403 	struct sys_ktrace_args /* {
    404 		syscallarg(const char *) fname;
    405 		syscallarg(int) ops;
    406 		syscallarg(int) facs;
    407 		syscallarg(int) pid;
    408 	} */ *uap = v;
    409 	struct vnode *vp = NULL;
    410 	struct proc *p;
    411 	struct pgrp *pg;
    412 	int facs = SCARG(uap, facs) & ~((unsigned) KTRFAC_ROOT);
    413 	int ops = KTROP(SCARG(uap, ops));
    414 	int descend = SCARG(uap, ops) & KTRFLAG_DESCEND;
    415 	int ret = 0;
    416 	int error = 0;
    417 	struct nameidata nd;
    418 
    419 	curp->p_traceflag |= KTRFAC_ACTIVE;
    420 	if (ops != KTROP_CLEAR) {
    421 		/*
    422 		 * an operation which requires a file argument.
    423 		 */
    424 		NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, fname),
    425 		    curp);
    426 		if ((error = vn_open(&nd, FREAD|FWRITE, 0)) != 0) {
    427 			curp->p_traceflag &= ~KTRFAC_ACTIVE;
    428 			return (error);
    429 		}
    430 		vp = nd.ni_vp;
    431 		VOP_UNLOCK(vp, 0);
    432 		if (vp->v_type != VREG) {
    433 			(void) vn_close(vp, FREAD|FWRITE, curp->p_ucred, curp);
    434 			curp->p_traceflag &= ~KTRFAC_ACTIVE;
    435 			return (EACCES);
    436 		}
    437 	}
    438 	/*
    439 	 * Clear all uses of the tracefile
    440 	 */
    441 	if (KTROP(ops) == KTROP_CLEARFILE) {
    442 		for (p = allproc.lh_first; p != 0; p = p->p_list.le_next) {
    443 			if (p->p_tracep == vp &&
    444 			    !ktrops(curp, p, KTROP_CLEAR, ~0, vp))
    445 				error = EPERM;
    446 		}
    447 		goto done;
    448 	}
    449 	/*
    450 	 * need something to (un)trace (XXX - why is this here?)
    451 	 */
    452 	if (!facs) {
    453 		error = EINVAL;
    454 		goto done;
    455 	}
    456 	/*
    457 	 * do it
    458 	 */
    459 	if (SCARG(uap, pid) < 0) {
    460 		/*
    461 		 * by process group
    462 		 */
    463 		pg = pgfind(-SCARG(uap, pid));
    464 		if (pg == NULL) {
    465 			error = ESRCH;
    466 			goto done;
    467 		}
    468 		for (p = pg->pg_members.lh_first; p != 0; p = p->p_pglist.le_next)
    469 			if (descend)
    470 				ret |= ktrsetchildren(curp, p, ops, facs, vp);
    471 			else
    472 				ret |= ktrops(curp, p, ops, facs, vp);
    473 
    474 	} else {
    475 		/*
    476 		 * by pid
    477 		 */
    478 		p = pfind(SCARG(uap, pid));
    479 		if (p == NULL) {
    480 			error = ESRCH;
    481 			goto done;
    482 		}
    483 		if (descend)
    484 			ret |= ktrsetchildren(curp, p, ops, facs, vp);
    485 		else
    486 			ret |= ktrops(curp, p, ops, facs, vp);
    487 	}
    488 	if (!ret)
    489 		error = EPERM;
    490 done:
    491 	if (vp != NULL)
    492 		(void) vn_close(vp, FWRITE, curp->p_ucred, curp);
    493 	curp->p_traceflag &= ~KTRFAC_ACTIVE;
    494 	return (error);
    495 }
    496 
    497 int
    498 ktrops(curp, p, ops, facs, v)
    499 	struct proc *p, *curp;
    500 	int ops, facs;
    501 	void *v;
    502 {
    503 
    504 	if (!ktrcanset(curp, p))
    505 		return (0);
    506 	if (KTROP(ops) == KTROP_SET) {
    507 		if (p->p_tracep != v) {
    508 			/*
    509 			 * if trace file already in use, relinquish
    510 			 */
    511 			ktrderef(p);
    512 			if (ops & KTRFLAG_FD)
    513 				p->p_traceflag = KTRFAC_FD;
    514 			p->p_tracep = v;
    515 			ktradref(p);
    516 		}
    517 		p->p_traceflag |= facs;
    518 		if (curp->p_ucred->cr_uid == 0)
    519 			p->p_traceflag |= KTRFAC_ROOT;
    520 	} else {
    521 		/* KTROP_CLEAR */
    522 		if (((p->p_traceflag &= ~facs) & KTRFAC_MASK) == 0) {
    523 			/* no more tracing */
    524 			ktrderef(p);
    525 		}
    526 	}
    527 
    528 	/*
    529 	 * Emit an emulation record, every time there is a ktrace
    530 	 * change/attach request.
    531 	 */
    532 	if (KTRPOINT(p, KTR_EMUL))
    533 		ktremul(p->p_tracep, p, p->p_emul->e_name);
    534 
    535 	return (1);
    536 }
    537 
    538 int
    539 ktrsetchildren(curp, top, ops, facs, v)
    540 	struct proc *curp, *top;
    541 	int ops, facs;
    542 	void *v;
    543 {
    544 	struct proc *p;
    545 	int ret = 0;
    546 
    547 	p = top;
    548 	for (;;) {
    549 		ret |= ktrops(curp, p, ops, facs, v);
    550 		/*
    551 		 * If this process has children, descend to them next,
    552 		 * otherwise do any siblings, and if done with this level,
    553 		 * follow back up the tree (but not past top).
    554 		 */
    555 		if (p->p_children.lh_first)
    556 			p = p->p_children.lh_first;
    557 		else for (;;) {
    558 			if (p == top)
    559 				return (ret);
    560 			if (p->p_sibling.le_next) {
    561 				p = p->p_sibling.le_next;
    562 				break;
    563 			}
    564 			p = p->p_pptr;
    565 		}
    566 	}
    567 	/*NOTREACHED*/
    568 }
    569 
    570 void
    571 ktrwrite(p, v, kth)
    572 	struct proc *p;
    573 	void *v;
    574 	struct ktr_header *kth;
    575 {
    576 	struct uio auio;
    577 	struct iovec aiov[2];
    578 	int error;
    579 
    580 	if (v == NULL)
    581 		return;
    582 	auio.uio_iov = &aiov[0];
    583 	auio.uio_offset = 0;
    584 	auio.uio_segflg = UIO_SYSSPACE;
    585 	auio.uio_rw = UIO_WRITE;
    586 	aiov[0].iov_base = (caddr_t)kth;
    587 	aiov[0].iov_len = sizeof(struct ktr_header);
    588 	auio.uio_resid = sizeof(struct ktr_header);
    589 	auio.uio_iovcnt = 1;
    590 	auio.uio_procp = (struct proc *)0;
    591 	if (kth->ktr_len > 0) {
    592 		auio.uio_iovcnt++;
    593 		aiov[1].iov_base = kth->ktr_buf;
    594 		aiov[1].iov_len = kth->ktr_len;
    595 		auio.uio_resid += kth->ktr_len;
    596 	}
    597 	if (p->p_traceflag & KTRFAC_FD) {
    598 		struct file *fp = v;
    599 
    600 		error = (*fp->f_ops->fo_write)(fp, &fp->f_offset, &auio,
    601 		    fp->f_cred, FOF_UPDATE_OFFSET);
    602 	}
    603 	else {
    604 		struct vnode *vp = v;
    605 
    606 		vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
    607 		error = VOP_WRITE(vp, &auio, IO_UNIT|IO_APPEND, p->p_ucred);
    608 		VOP_UNLOCK(vp, 0);
    609 	}
    610 	if (!error)
    611 		return;
    612 	/*
    613 	 * If error encountered, give up tracing on this vnode.
    614 	 */
    615 	log(LOG_NOTICE, "ktrace write failed, errno %d, tracing stopped\n",
    616 	    error);
    617 	for (p = allproc.lh_first; p != 0; p = p->p_list.le_next) {
    618 		if (p->p_tracep == v)
    619 			ktrderef(p);
    620 	}
    621 }
    622 
    623 /*
    624  * Return true if caller has permission to set the ktracing state
    625  * of target.  Essentially, the target can't possess any
    626  * more permissions than the caller.  KTRFAC_ROOT signifies that
    627  * root previously set the tracing status on the target process, and
    628  * so, only root may further change it.
    629  *
    630  * TODO: check groups.  use caller effective gid.
    631  */
    632 int
    633 ktrcanset(callp, targetp)
    634 	struct proc *callp, *targetp;
    635 {
    636 	struct pcred *caller = callp->p_cred;
    637 	struct pcred *target = targetp->p_cred;
    638 
    639 	if ((caller->pc_ucred->cr_uid == target->p_ruid &&
    640 	     target->p_ruid == target->p_svuid &&
    641 	     caller->p_rgid == target->p_rgid &&	/* XXX */
    642 	     target->p_rgid == target->p_svgid &&
    643 	     (targetp->p_traceflag & KTRFAC_ROOT) == 0) ||
    644 	     caller->pc_ucred->cr_uid == 0)
    645 		return (1);
    646 
    647 	return (0);
    648 }
    649 
    650 #endif
    651