1 /* $NetBSD: kern_prot.c,v 1.122 2020/05/23 23:42:43 ad Exp $ */
2
3 /*
4 * Copyright (c) 1982, 1986, 1989, 1990, 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_prot.c 8.9 (Berkeley) 2/14/95
37 */
38
39 /*
40 * System calls related to processes and protection
41 */
42
43 #include <sys/cdefs.h>
44 __KERNEL_RCSID(0, "$NetBSD: kern_prot.c,v 1.122 2020/05/23 23:42:43 ad Exp $");
45
46 #ifdef _KERNEL_OPT
47 #include "opt_compat_43.h"
48 #endif
49
50 #include <sys/param.h>
51 #include <sys/acct.h>
52 #include <sys/systm.h>
53 #include <sys/ucred.h>
54 #include <sys/proc.h>
55 #include <sys/timeb.h>
56 #include <sys/times.h>
57 #include <sys/pool.h>
58 #include <sys/prot.h>
59 #include <sys/syslog.h>
60 #include <sys/uidinfo.h>
61 #include <sys/kauth.h>
62
63 #include <sys/mount.h>
64 #include <sys/syscallargs.h>
65
66 int sys_getpid(struct lwp *, const void *, register_t *);
67 int sys_getpid_with_ppid(struct lwp *, const void *, register_t *);
68 int sys_getuid(struct lwp *, const void *, register_t *);
69 int sys_getuid_with_euid(struct lwp *, const void *, register_t *);
70 int sys_getgid(struct lwp *, const void *, register_t *);
71 int sys_getgid_with_egid(struct lwp *, const void *, register_t *);
72
73 /* ARGSUSED */
74 int
sys_getpid(struct lwp * l,const void * v,register_t * retval)75 sys_getpid(struct lwp *l, const void *v, register_t *retval)
76 {
77 struct proc *p = l->l_proc;
78
79 *retval = p->p_pid;
80 return (0);
81 }
82
83 /* ARGSUSED */
84 int
sys_getpid_with_ppid(struct lwp * l,const void * v,register_t * retval)85 sys_getpid_with_ppid(struct lwp *l, const void *v, register_t *retval)
86 {
87 struct proc *p = l->l_proc;
88
89 retval[0] = p->p_pid;
90 retval[1] = p->p_ppid;
91 return (0);
92 }
93
94 /* ARGSUSED */
95 int
sys_getppid(struct lwp * l,const void * v,register_t * retval)96 sys_getppid(struct lwp *l, const void *v, register_t *retval)
97 {
98 struct proc *p = l->l_proc;
99
100 *retval = p->p_ppid;
101 return (0);
102 }
103
104 /* Get process group ID; note that POSIX getpgrp takes no parameter */
105 int
sys_getpgrp(struct lwp * l,const void * v,register_t * retval)106 sys_getpgrp(struct lwp *l, const void *v, register_t *retval)
107 {
108 struct proc *p = l->l_proc;
109
110 mutex_enter(&proc_lock);
111 *retval = p->p_pgrp->pg_id;
112 mutex_exit(&proc_lock);
113 return (0);
114 }
115
116 /*
117 * Return the process group ID of the session leader (session ID)
118 * for the specified process.
119 */
120 int
sys_getsid(struct lwp * l,const struct sys_getsid_args * uap,register_t * retval)121 sys_getsid(struct lwp *l, const struct sys_getsid_args *uap, register_t *retval)
122 {
123 /* {
124 syscalldarg(pid_t) pid;
125 } */
126 pid_t pid = SCARG(uap, pid);
127 struct proc *p;
128 int error = 0;
129
130 mutex_enter(&proc_lock);
131 if (pid == 0)
132 *retval = l->l_proc->p_session->s_sid;
133 else if ((p = proc_find(pid)) != NULL)
134 *retval = p->p_session->s_sid;
135 else
136 error = ESRCH;
137 mutex_exit(&proc_lock);
138
139 return error;
140 }
141
142 int
sys_getpgid(struct lwp * l,const struct sys_getpgid_args * uap,register_t * retval)143 sys_getpgid(struct lwp *l, const struct sys_getpgid_args *uap, register_t *retval)
144 {
145 /* {
146 syscallarg(pid_t) pid;
147 } */
148 pid_t pid = SCARG(uap, pid);
149 struct proc *p;
150 int error = 0;
151
152 mutex_enter(&proc_lock);
153 if (pid == 0)
154 *retval = l->l_proc->p_pgid;
155 else if ((p = proc_find(pid)) != NULL)
156 *retval = p->p_pgid;
157 else
158 error = ESRCH;
159 mutex_exit(&proc_lock);
160
161 return error;
162 }
163
164 /* ARGSUSED */
165 int
sys_getuid(struct lwp * l,const void * v,register_t * retval)166 sys_getuid(struct lwp *l, const void *v, register_t *retval)
167 {
168
169 *retval = kauth_cred_getuid(l->l_cred);
170 return (0);
171 }
172
173 /* ARGSUSED */
174 int
sys_getuid_with_euid(struct lwp * l,const void * v,register_t * retval)175 sys_getuid_with_euid(struct lwp *l, const void *v, register_t *retval)
176 {
177
178 retval[0] = kauth_cred_getuid(l->l_cred);
179 retval[1] = kauth_cred_geteuid(l->l_cred);
180 return (0);
181 }
182
183 /* ARGSUSED */
184 int
sys_geteuid(struct lwp * l,const void * v,register_t * retval)185 sys_geteuid(struct lwp *l, const void *v, register_t *retval)
186 {
187
188 *retval = kauth_cred_geteuid(l->l_cred);
189 return (0);
190 }
191
192 /* ARGSUSED */
193 int
sys_getgid(struct lwp * l,const void * v,register_t * retval)194 sys_getgid(struct lwp *l, const void *v, register_t *retval)
195 {
196
197 *retval = kauth_cred_getgid(l->l_cred);
198 return (0);
199 }
200
201 /* ARGSUSED */
202 int
sys_getgid_with_egid(struct lwp * l,const void * v,register_t * retval)203 sys_getgid_with_egid(struct lwp *l, const void *v, register_t *retval)
204 {
205
206 retval[0] = kauth_cred_getgid(l->l_cred);
207 retval[1] = kauth_cred_getegid(l->l_cred);
208 return (0);
209 }
210
211 /*
212 * Get effective group ID. The "egid" is groups[0], and could be obtained
213 * via getgroups. This syscall exists because it is somewhat painful to do
214 * correctly in a library function.
215 */
216 /* ARGSUSED */
217 int
sys_getegid(struct lwp * l,const void * v,register_t * retval)218 sys_getegid(struct lwp *l, const void *v, register_t *retval)
219 {
220
221 *retval = kauth_cred_getegid(l->l_cred);
222 return (0);
223 }
224
225 int
sys_getgroups(struct lwp * l,const struct sys_getgroups_args * uap,register_t * retval)226 sys_getgroups(struct lwp *l, const struct sys_getgroups_args *uap, register_t *retval)
227 {
228 /* {
229 syscallarg(int) gidsetsize;
230 syscallarg(gid_t *) gidset;
231 } */
232
233 *retval = kauth_cred_ngroups(l->l_cred);
234 if (SCARG(uap, gidsetsize) == 0)
235 return 0;
236 if (SCARG(uap, gidsetsize) < (int)*retval)
237 return EINVAL;
238
239 return kauth_cred_getgroups(l->l_cred, SCARG(uap, gidset), *retval,
240 UIO_USERSPACE);
241 }
242
243 int
sys_setsid(struct lwp * l,const void * v,register_t * retval)244 sys_setsid(struct lwp *l, const void *v, register_t *retval)
245 {
246 struct proc *p = l->l_proc;
247 int error;
248
249 error = proc_enterpgrp(p, p->p_pid, p->p_pid, true);
250 *retval = p->p_pid;
251 return (error);
252 }
253
254
255 /*
256 * set process group (setpgid/old setpgrp)
257 *
258 * caller does setpgid(targpid, targpgid)
259 *
260 * pgid must be in valid range (EINVAL)
261 * pid must be caller or child of caller (ESRCH)
262 * if a child
263 * pid must be in same session (EPERM)
264 * pid can't have done an exec (EACCES)
265 * if pgid != pid
266 * there must exist some pid in same session having pgid (EPERM)
267 * pid must not be session leader (EPERM)
268 *
269 * Permission checks now in proc_enterpgrp()
270 */
271 int
sys_setpgid(struct lwp * l,const struct sys_setpgid_args * uap,register_t * retval)272 sys_setpgid(struct lwp *l, const struct sys_setpgid_args *uap,
273 register_t *retval)
274 {
275 /* {
276 syscallarg(int) pid;
277 syscallarg(int) pgid;
278 } */
279 struct proc *p = l->l_proc;
280 pid_t targp, pgid;
281
282 if (SCARG(uap, pgid) < 0)
283 return EINVAL;
284 if ((targp = SCARG(uap, pid)) == 0)
285 targp = p->p_pid;
286 if ((pgid = SCARG(uap, pgid)) == 0)
287 pgid = targp;
288
289 return proc_enterpgrp(p, targp, pgid, false);
290 }
291
292 /*
293 * Set real, effective and saved uids to the requested values.
294 * non-root callers can only ever change uids to values that match
295 * one of the processes current uid values.
296 * This is further restricted by the flags argument.
297 */
298
299 int
do_setresuid(struct lwp * l,uid_t r,uid_t e,uid_t sv,u_int flags)300 do_setresuid(struct lwp *l, uid_t r, uid_t e, uid_t sv, u_int flags)
301 {
302 struct proc *p = l->l_proc;
303 kauth_cred_t cred, ncred;
304
305 ncred = kauth_cred_alloc();
306
307 /* Get a write lock on the process credential. */
308 proc_crmod_enter();
309 cred = p->p_cred;
310
311 /*
312 * Check that the new value is one of the allowed existing values,
313 * or that we have root privilege.
314 */
315 if ((r != -1
316 && !((flags & ID_R_EQ_R) && r == kauth_cred_getuid(cred))
317 && !((flags & ID_R_EQ_E) && r == kauth_cred_geteuid(cred))
318 && !((flags & ID_R_EQ_S) && r == kauth_cred_getsvuid(cred))) ||
319 (e != -1
320 && !((flags & ID_E_EQ_R) && e == kauth_cred_getuid(cred))
321 && !((flags & ID_E_EQ_E) && e == kauth_cred_geteuid(cred))
322 && !((flags & ID_E_EQ_S) && e == kauth_cred_getsvuid(cred))) ||
323 (sv != -1
324 && !((flags & ID_S_EQ_R) && sv == kauth_cred_getuid(cred))
325 && !((flags & ID_S_EQ_E) && sv == kauth_cred_geteuid(cred))
326 && !((flags & ID_S_EQ_S) && sv == kauth_cred_getsvuid(cred)))) {
327 int error;
328
329 error = kauth_authorize_process(cred, KAUTH_PROCESS_SETID,
330 p, NULL, NULL, NULL);
331 if (error != 0) {
332 proc_crmod_leave(cred, ncred, false);
333 return error;
334 }
335 }
336
337 /* If nothing has changed, short circuit the request */
338 if ((r == -1 || r == kauth_cred_getuid(cred))
339 && (e == -1 || e == kauth_cred_geteuid(cred))
340 && (sv == -1 || sv == kauth_cred_getsvuid(cred))) {
341 proc_crmod_leave(cred, ncred, false);
342 return 0;
343 }
344
345 kauth_cred_clone(cred, ncred);
346
347 if (r != -1 && r != kauth_cred_getuid(ncred)) {
348 u_long nlwps;
349
350 /* Update count of processes for this user. */
351 (void)chgproccnt(kauth_cred_getuid(ncred), -1);
352 (void)chgproccnt(r, 1);
353
354 /* The first LWP of a process is excluded. */
355 KASSERT(mutex_owned(p->p_lock));
356 nlwps = p->p_nlwps - 1;
357 (void)chglwpcnt(kauth_cred_getuid(ncred), -nlwps);
358 (void)chglwpcnt(r, nlwps);
359
360 kauth_cred_setuid(ncred, r);
361 }
362 if (sv != -1)
363 kauth_cred_setsvuid(ncred, sv);
364 if (e != -1)
365 kauth_cred_seteuid(ncred, e);
366
367 /* Broadcast our credentials to the process and other LWPs. */
368 proc_crmod_leave(ncred, cred, true);
369
370 return 0;
371 }
372
373 /*
374 * Set real, effective and saved gids to the requested values.
375 * non-root callers can only ever change gids to values that match
376 * one of the processes current gid values.
377 * This is further restricted by the flags argument.
378 */
379
380 int
do_setresgid(struct lwp * l,gid_t r,gid_t e,gid_t sv,u_int flags)381 do_setresgid(struct lwp *l, gid_t r, gid_t e, gid_t sv, u_int flags)
382 {
383 struct proc *p = l->l_proc;
384 kauth_cred_t cred, ncred;
385
386 ncred = kauth_cred_alloc();
387
388 /* Get a write lock on the process credential. */
389 proc_crmod_enter();
390 cred = p->p_cred;
391
392 /*
393 * check new value is one of the allowed existing values.
394 * otherwise, check if we have root privilege.
395 */
396 if ((r != -1
397 && !((flags & ID_R_EQ_R) && r == kauth_cred_getgid(cred))
398 && !((flags & ID_R_EQ_E) && r == kauth_cred_getegid(cred))
399 && !((flags & ID_R_EQ_S) && r == kauth_cred_getsvgid(cred))) ||
400 (e != -1
401 && !((flags & ID_E_EQ_R) && e == kauth_cred_getgid(cred))
402 && !((flags & ID_E_EQ_E) && e == kauth_cred_getegid(cred))
403 && !((flags & ID_E_EQ_S) && e == kauth_cred_getsvgid(cred))) ||
404 (sv != -1
405 && !((flags & ID_S_EQ_R) && sv == kauth_cred_getgid(cred))
406 && !((flags & ID_S_EQ_E) && sv == kauth_cred_getegid(cred))
407 && !((flags & ID_S_EQ_S) && sv == kauth_cred_getsvgid(cred)))) {
408 int error;
409
410 error = kauth_authorize_process(cred, KAUTH_PROCESS_SETID,
411 p, NULL, NULL, NULL);
412 if (error != 0) {
413 proc_crmod_leave(cred, ncred, false);
414 return error;
415 }
416 }
417
418 /* If nothing has changed, short circuit the request */
419 if ((r == -1 || r == kauth_cred_getgid(cred))
420 && (e == -1 || e == kauth_cred_getegid(cred))
421 && (sv == -1 || sv == kauth_cred_getsvgid(cred))) {
422 proc_crmod_leave(cred, ncred, false);
423 return 0;
424 }
425
426 kauth_cred_clone(cred, ncred);
427
428 if (r != -1)
429 kauth_cred_setgid(ncred, r);
430 if (sv != -1)
431 kauth_cred_setsvgid(ncred, sv);
432 if (e != -1)
433 kauth_cred_setegid(ncred, e);
434
435 /* Broadcast our credentials to the process and other LWPs. */
436 proc_crmod_leave(ncred, cred, true);
437
438 return 0;
439 }
440
441 /* ARGSUSED */
442 int
sys_setuid(struct lwp * l,const struct sys_setuid_args * uap,register_t * retval)443 sys_setuid(struct lwp *l, const struct sys_setuid_args *uap, register_t *retval)
444 {
445 /* {
446 syscallarg(uid_t) uid;
447 } */
448 uid_t uid = SCARG(uap, uid);
449
450 return do_setresuid(l, uid, uid, uid,
451 ID_R_EQ_R | ID_E_EQ_R | ID_S_EQ_R);
452 }
453
454 /* ARGSUSED */
455 int
sys_seteuid(struct lwp * l,const struct sys_seteuid_args * uap,register_t * retval)456 sys_seteuid(struct lwp *l, const struct sys_seteuid_args *uap, register_t *retval)
457 {
458 /* {
459 syscallarg(uid_t) euid;
460 } */
461
462 return do_setresuid(l, -1, SCARG(uap, euid), -1, ID_E_EQ_R | ID_E_EQ_S);
463 }
464
465 int
sys_setreuid(struct lwp * l,const struct sys_setreuid_args * uap,register_t * retval)466 sys_setreuid(struct lwp *l, const struct sys_setreuid_args *uap, register_t *retval)
467 {
468 /* {
469 syscallarg(uid_t) ruid;
470 syscallarg(uid_t) euid;
471 } */
472 kauth_cred_t cred = l->l_cred;
473 uid_t ruid, euid, svuid;
474
475 ruid = SCARG(uap, ruid);
476 euid = SCARG(uap, euid);
477
478 if (ruid == -1)
479 ruid = kauth_cred_getuid(cred);
480 if (euid == -1)
481 euid = kauth_cred_geteuid(cred);
482
483 /* Saved uid is set to the new euid if the ruid changed */
484 svuid = (ruid == kauth_cred_getuid(cred)) ? -1 : euid;
485
486 return do_setresuid(l, ruid, euid, svuid,
487 ID_R_EQ_R | ID_R_EQ_E |
488 ID_E_EQ_R | ID_E_EQ_E | ID_E_EQ_S |
489 ID_S_EQ_R | ID_S_EQ_E | ID_S_EQ_S);
490 }
491
492 /* ARGSUSED */
493 int
sys_setgid(struct lwp * l,const struct sys_setgid_args * uap,register_t * retval)494 sys_setgid(struct lwp *l, const struct sys_setgid_args *uap, register_t *retval)
495 {
496 /* {
497 syscallarg(gid_t) gid;
498 } */
499 gid_t gid = SCARG(uap, gid);
500
501 return do_setresgid(l, gid, gid, gid,
502 ID_R_EQ_R | ID_E_EQ_R | ID_S_EQ_R);
503 }
504
505 /* ARGSUSED */
506 int
sys_setegid(struct lwp * l,const struct sys_setegid_args * uap,register_t * retval)507 sys_setegid(struct lwp *l, const struct sys_setegid_args *uap, register_t *retval)
508 {
509 /* {
510 syscallarg(gid_t) egid;
511 } */
512
513 return do_setresgid(l, -1, SCARG(uap, egid), -1, ID_E_EQ_R | ID_E_EQ_S);
514 }
515
516 int
sys_setregid(struct lwp * l,const struct sys_setregid_args * uap,register_t * retval)517 sys_setregid(struct lwp *l, const struct sys_setregid_args *uap, register_t *retval)
518 {
519 /* {
520 syscallarg(gid_t) rgid;
521 syscallarg(gid_t) egid;
522 } */
523 kauth_cred_t cred = l->l_cred;
524 gid_t rgid, egid, svgid;
525
526 rgid = SCARG(uap, rgid);
527 egid = SCARG(uap, egid);
528
529 if (rgid == -1)
530 rgid = kauth_cred_getgid(cred);
531 if (egid == -1)
532 egid = kauth_cred_getegid(cred);
533
534 /* Saved gid is set to the new egid if the rgid changed */
535 svgid = rgid == kauth_cred_getgid(cred) ? -1 : egid;
536
537 return do_setresgid(l, rgid, egid, svgid,
538 ID_R_EQ_R | ID_R_EQ_E |
539 ID_E_EQ_R | ID_E_EQ_E | ID_E_EQ_S |
540 ID_S_EQ_R | ID_S_EQ_E | ID_S_EQ_S);
541 }
542
543 int
sys_issetugid(struct lwp * l,const void * v,register_t * retval)544 sys_issetugid(struct lwp *l, const void *v, register_t *retval)
545 {
546 struct proc *p = l->l_proc;
547
548 /*
549 * Note: OpenBSD sets a P_SUGIDEXEC flag set at execve() time,
550 * we use PK_SUGID because we consider changing the owners as
551 * "tainting" as well.
552 * This is significant for procs that start as root and "become"
553 * a user without an exec - programs cannot know *everything*
554 * that libc *might* have put in their data segment.
555 */
556 *retval = (p->p_flag & PK_SUGID) != 0;
557 return (0);
558 }
559
560 /* ARGSUSED */
561 int
sys_setgroups(struct lwp * l,const struct sys_setgroups_args * uap,register_t * retval)562 sys_setgroups(struct lwp *l, const struct sys_setgroups_args *uap, register_t *retval)
563 {
564 /* {
565 syscallarg(int) gidsetsize;
566 syscallarg(const gid_t *) gidset;
567 } */
568 kauth_cred_t ncred;
569 int error;
570
571 ncred = kauth_cred_alloc();
572 error = kauth_cred_setgroups(ncred, SCARG(uap, gidset),
573 SCARG(uap, gidsetsize), -1, UIO_USERSPACE);
574 if (error != 0) {
575 kauth_cred_free(ncred);
576 return error;
577 }
578
579 return kauth_proc_setgroups(l, ncred);
580 }
581
582 /*
583 * Get login name, if available.
584 */
585 /* ARGSUSED */
586 int
sys___getlogin(struct lwp * l,const struct sys___getlogin_args * uap,register_t * retval)587 sys___getlogin(struct lwp *l, const struct sys___getlogin_args *uap, register_t *retval)
588 {
589 /* {
590 syscallarg(char *) namebuf;
591 syscallarg(size_t) namelen;
592 } */
593 struct proc *p = l->l_proc;
594 char login[sizeof(p->p_session->s_login)];
595 size_t namelen = SCARG(uap, namelen);
596
597 if (namelen > sizeof(login))
598 namelen = sizeof(login);
599 mutex_enter(&proc_lock);
600 memcpy(login, p->p_session->s_login, namelen);
601 mutex_exit(&proc_lock);
602 return (copyout(login, (void *)SCARG(uap, namebuf), namelen));
603 }
604
605 /*
606 * Set login name.
607 */
608 /* ARGSUSED */
609 int
sys___setlogin(struct lwp * l,const struct sys___setlogin_args * uap,register_t * retval)610 sys___setlogin(struct lwp *l, const struct sys___setlogin_args *uap, register_t *retval)
611 {
612 /* {
613 syscallarg(const char *) namebuf;
614 } */
615 struct proc *p = l->l_proc;
616 struct session *sp;
617 char newname[sizeof sp->s_login + 1];
618 int error;
619
620 if ((error = kauth_authorize_process(l->l_cred, KAUTH_PROCESS_SETID,
621 p, NULL, NULL, NULL)) != 0)
622 return (error);
623 error = copyinstr(SCARG(uap, namebuf), newname, sizeof newname, NULL);
624 if (error != 0)
625 return (error == ENAMETOOLONG ? EINVAL : error);
626
627 mutex_enter(&proc_lock);
628 sp = p->p_session;
629 if (sp->s_flags & S_LOGIN_SET && p->p_pid != sp->s_sid &&
630 strncmp(newname, sp->s_login, sizeof sp->s_login) != 0)
631 log(LOG_WARNING, "%s (pid %d) changing logname from "
632 "%.*s to %s\n", p->p_comm, p->p_pid,
633 (int)sizeof sp->s_login, sp->s_login, newname);
634 sp->s_flags |= S_LOGIN_SET;
635 strncpy(sp->s_login, newname, sizeof sp->s_login);
636 mutex_exit(&proc_lock);
637 return (0);
638 }
639