FreeBSD/Linux Kernel Cross Reference
sys/kern/kern_prot.c
1 /* $NetBSD: kern_prot.c,v 1.80 2003/08/07 16:31:47 agc 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 1.80 2003/08/07 16:31:47 agc Exp $");
45
46 #include "opt_compat_43.h"
47
48 #include <sys/param.h>
49 #include <sys/acct.h>
50 #include <sys/systm.h>
51 #include <sys/ucred.h>
52 #include <sys/proc.h>
53 #include <sys/timeb.h>
54 #include <sys/times.h>
55 #include <sys/malloc.h>
56 #include <sys/syslog.h>
57
58 #include <sys/mount.h>
59 #include <sys/sa.h>
60 #include <sys/syscallargs.h>
61
62 MALLOC_DEFINE(M_CRED, "cred", "credentials");
63
64 int sys_getpid(struct lwp *, void *, register_t *);
65 int sys_getpid_with_ppid(struct lwp *, void *, register_t *);
66 int sys_getuid(struct lwp *, void *, register_t *);
67 int sys_getuid_with_euid(struct lwp *, void *, register_t *);
68 int sys_getgid(struct lwp *, void *, register_t *);
69 int sys_getgid_with_egid(struct lwp *, void *, register_t *);
70
71 /* ARGSUSED */
72 int
73 sys_getpid(struct lwp *l, void *v, register_t *retval)
74 {
75 struct proc *p = l->l_proc;
76
77 *retval = p->p_pid;
78 return (0);
79 }
80
81 /* ARGSUSED */
82 int
83 sys_getpid_with_ppid(struct lwp *l, void *v, register_t *retval)
84 {
85 struct proc *p = l->l_proc;
86
87 retval[0] = p->p_pid;
88 retval[1] = p->p_pptr->p_pid;
89 return (0);
90 }
91
92 /* ARGSUSED */
93 int
94 sys_getppid(struct lwp *l, void *v, register_t *retval)
95 {
96 struct proc *p = l->l_proc;
97
98 *retval = p->p_pptr->p_pid;
99 return (0);
100 }
101
102 /* Get process group ID; note that POSIX getpgrp takes no parameter */
103 int
104 sys_getpgrp(struct lwp *l, void *v, register_t *retval)
105 {
106 struct proc *p = l->l_proc;
107
108 *retval = p->p_pgrp->pg_id;
109 return (0);
110 }
111
112 /*
113 * Return the process group ID of the session leader (session ID)
114 * for the specified process.
115 */
116 int
117 sys_getsid(struct lwp *l, void *v, register_t *retval)
118 {
119 struct sys_getsid_args /* {
120 syscalldarg(pid_t) pid;
121 } */ *uap = v;
122 struct proc *p = l->l_proc;
123
124 if (SCARG(uap, pid) == 0)
125 goto found;
126 if ((p = pfind(SCARG(uap, pid))) == 0)
127 return (ESRCH);
128 found:
129 *retval = p->p_session->s_sid;
130 return (0);
131 }
132
133 int
134 sys_getpgid(struct lwp *l, void *v, register_t *retval)
135 {
136 struct sys_getpgid_args /* {
137 syscallarg(pid_t) pid;
138 } */ *uap = v;
139 struct proc *p = l->l_proc;
140
141 if (SCARG(uap, pid) == 0)
142 goto found;
143 if ((p = pfind(SCARG(uap, pid))) == 0)
144 return (ESRCH);
145 found:
146 *retval = p->p_pgid;
147 return (0);
148 }
149
150 /* ARGSUSED */
151 int
152 sys_getuid(struct lwp *l, void *v, register_t *retval)
153 {
154 struct proc *p = l->l_proc;
155
156 *retval = p->p_cred->p_ruid;
157 return (0);
158 }
159
160 /* ARGSUSED */
161 int
162 sys_getuid_with_euid(struct lwp *l, void *v, register_t *retval)
163 {
164 struct proc *p = l->l_proc;
165
166 retval[0] = p->p_cred->p_ruid;
167 retval[1] = p->p_ucred->cr_uid;
168 return (0);
169 }
170
171 /* ARGSUSED */
172 int
173 sys_geteuid(struct lwp *l, void *v, register_t *retval)
174 {
175 struct proc *p = l->l_proc;
176
177 *retval = p->p_ucred->cr_uid;
178 return (0);
179 }
180
181 /* ARGSUSED */
182 int
183 sys_getgid(struct lwp *l, void *v, register_t *retval)
184 {
185 struct proc *p = l->l_proc;
186
187 *retval = p->p_cred->p_rgid;
188 return (0);
189 }
190
191 /* ARGSUSED */
192 int
193 sys_getgid_with_egid(struct lwp *l, void *v, register_t *retval)
194 {
195 struct proc *p = l->l_proc;
196
197 retval[0] = p->p_cred->p_rgid;
198 retval[1] = p->p_ucred->cr_gid;
199 return (0);
200 }
201
202 /*
203 * Get effective group ID. The "egid" is groups[0], and could be obtained
204 * via getgroups. This syscall exists because it is somewhat painful to do
205 * correctly in a library function.
206 */
207 /* ARGSUSED */
208 int
209 sys_getegid(struct lwp *l, void *v, register_t *retval)
210 {
211 struct proc *p = l->l_proc;
212
213 *retval = p->p_ucred->cr_gid;
214 return (0);
215 }
216
217 int
218 sys_getgroups(struct lwp *l, void *v, register_t *retval)
219 {
220 struct sys_getgroups_args /* {
221 syscallarg(int) gidsetsize;
222 syscallarg(gid_t *) gidset;
223 } */ *uap = v;
224 struct proc *p = l->l_proc;
225 struct pcred *pc = p->p_cred;
226 u_int ngrp;
227 int error;
228
229 if (SCARG(uap, gidsetsize) == 0) {
230 *retval = pc->pc_ucred->cr_ngroups;
231 return (0);
232 } else if (SCARG(uap, gidsetsize) < 0)
233 return (EINVAL);
234 ngrp = SCARG(uap, gidsetsize);
235 if (ngrp < pc->pc_ucred->cr_ngroups)
236 return (EINVAL);
237 ngrp = pc->pc_ucred->cr_ngroups;
238 error = copyout((caddr_t)pc->pc_ucred->cr_groups,
239 (caddr_t)SCARG(uap, gidset), ngrp * sizeof(gid_t));
240 if (error)
241 return (error);
242 *retval = ngrp;
243 return (0);
244 }
245
246 /* ARGSUSED */
247 int
248 sys_setsid(struct lwp *l, void *v, register_t *retval)
249 {
250 struct proc *p = l->l_proc;
251
252 if (p->p_pgid == p->p_pid || pgfind(p->p_pid)) {
253 return (EPERM);
254 } else {
255 (void)enterpgrp(p, p->p_pid, 1);
256 *retval = p->p_pid;
257 return (0);
258 }
259 }
260
261 /*
262 * set process group (setpgid/old setpgrp)
263 *
264 * caller does setpgid(targpid, targpgid)
265 *
266 * pgid must be in valid range (EINVAL)
267 * pid must be caller or child of caller (ESRCH)
268 * if a child
269 * pid must be in same session (EPERM)
270 * pid can't have done an exec (EACCES)
271 * if pgid != pid
272 * there must exist some pid in same session having pgid (EPERM)
273 * pid must not be session leader (EPERM)
274 *
275 * Permission checks now in enterpgrp()
276 */
277 /* ARGSUSED */
278 int
279 sys_setpgid(struct lwp *l, void *v, register_t *retval)
280 {
281 struct sys_setpgid_args /* {
282 syscallarg(int) pid;
283 syscallarg(int) pgid;
284 } */ *uap = v;
285 struct proc *curp = l->l_proc;
286 struct proc *targp; /* target process */
287
288 if (SCARG(uap, pgid) < 0)
289 return EINVAL;
290
291 /* XXX MP - there is a horrid race here with targp exiting! */
292 if (SCARG(uap, pid) != 0 && SCARG(uap, pid) != curp->p_pid) {
293 targp = pfind(SCARG(uap, pid));
294 if (targp == NULL)
295 return ESRCH;
296 } else
297 targp = curp;
298
299 if (SCARG(uap, pgid) == 0)
300 SCARG(uap, pgid) = targp->p_pid;
301 return enterpgrp(targp, SCARG(uap, pgid), 0);
302 }
303
304 /*
305 * Set real, effective and saved uids to the requested values.
306 * non-root callers can only ever change uids to values that match
307 * one of the processes current uid values.
308 * This is further restricted by the flags argument.
309 */
310
311 int
312 do_setresuid(struct lwp *l, uid_t r, uid_t e, uid_t sv, u_int flags)
313 {
314 int error;
315 struct proc *p = l->l_proc;
316 struct pcred *pcred = p->p_cred;
317 struct ucred *cred = pcred->pc_ucred;
318
319 /* Superuser can do anything it wants to.... */
320 error = suser(cred, &p->p_acflag);
321 if (error) {
322 /* Otherwise check new value is one of the allowed
323 existing values. */
324 if (r != -1 && !((flags & ID_R_EQ_R) && r == pcred->p_ruid)
325 && !((flags & ID_R_EQ_E) && r == cred->cr_uid)
326 && !((flags & ID_R_EQ_S) && r == pcred->p_svuid))
327 return error;
328 if (e != -1 && !((flags & ID_E_EQ_R) && e == pcred->p_ruid)
329 && !((flags & ID_E_EQ_E) && e == cred->cr_uid)
330 && !((flags & ID_E_EQ_S) && e == pcred->p_svuid))
331 return error;
332 if (sv != -1 && !((flags & ID_S_EQ_R) && sv == pcred->p_ruid)
333 && !((flags & ID_S_EQ_E) && sv == cred->cr_uid)
334 && !((flags & ID_S_EQ_S) && sv == pcred->p_svuid))
335 return error;
336 }
337
338 /* If nothing has changed, short circuit the request */
339 if ((r == -1 || r == pcred->p_ruid)
340 && (e == -1 || e == cred->cr_uid)
341 && (sv == -1 || sv == pcred->p_svuid))
342 /* nothing to do */
343 return 0;
344
345 /* The pcred structure is not actually shared... */
346 if (r != -1 && r != pcred->p_ruid) {
347 /* Update count of processes for this user */
348 (void)chgproccnt(pcred->p_ruid, -1);
349 (void)chgproccnt(r, 1);
350 pcred->p_ruid = r;
351 }
352 if (sv != -1)
353 pcred->p_svuid = sv;
354 if (e != -1 && e != cred->cr_uid) {
355 /* Update a clone of the current credentials */
356 pcred->pc_ucred = cred = crcopy(cred);
357 cred->cr_uid = e;
358 }
359
360 /* Mark process as having changed credentials, stops tracing etc */
361 p_sugid(p);
362 return 0;
363 }
364
365 /*
366 * Set real, effective and saved gids to the requested values.
367 * non-root callers can only ever change gids to values that match
368 * one of the processes current gid values.
369 * This is further restricted by the flags argument.
370 */
371
372 int
373 do_setresgid(struct lwp *l, gid_t r, gid_t e, gid_t sv, u_int flags)
374 {
375 int error;
376 struct proc *p = l->l_proc;
377 struct pcred *pcred = p->p_cred;
378 struct ucred *cred = pcred->pc_ucred;
379
380 /* Superuser can do anything it wants to.... */
381 error = suser(cred, &p->p_acflag);
382 if (error) {
383 /* Otherwise check new value is one of the allowed
384 existing values. */
385 if (r != -1 && !((flags & ID_R_EQ_R) && r == pcred->p_rgid)
386 && !((flags & ID_R_EQ_E) && r == cred->cr_gid)
387 && !((flags & ID_R_EQ_S) && r == pcred->p_svgid))
388 return error;
389 if (e != -1 && !((flags & ID_E_EQ_R) && e == pcred->p_rgid)
390 && !((flags & ID_E_EQ_E) && e == cred->cr_gid)
391 && !((flags & ID_E_EQ_S) && e == pcred->p_svgid))
392 return error;
393 if (sv != -1 && !((flags & ID_S_EQ_R) && sv == pcred->p_rgid)
394 && !((flags & ID_S_EQ_E) && sv == cred->cr_gid)
395 && !((flags & ID_S_EQ_S) && sv == pcred->p_svgid))
396 return error;
397 }
398
399 /* If nothing has changed, short circuit the request */
400 if ((r == -1 || r == pcred->p_rgid)
401 && (e == -1 || e == cred->cr_gid)
402 && (sv == -1 || sv == pcred->p_svgid))
403 /* nothing to do */
404 return 0;
405
406 /* The pcred structure is not actually shared... */
407 if (r != -1)
408 pcred->p_rgid = r;
409 if (sv != -1)
410 pcred->p_svgid = sv;
411 if (e != -1 && e != cred->cr_gid) {
412 /* Update a clone of the current credentials */
413 pcred->pc_ucred = cred = crcopy(cred);
414 cred->cr_gid = e;
415 }
416
417 /* Mark process as having changed credentials, stops tracing etc */
418 p_sugid(p);
419 return 0;
420 }
421
422 /* ARGSUSED */
423 int
424 sys_setuid(struct lwp *l, void *v, register_t *retval)
425 {
426 struct sys_setuid_args /* {
427 syscallarg(uid_t) uid;
428 } */ *uap = v;
429 uid_t uid = SCARG(uap, uid);
430
431 return do_setresuid(l, uid, uid, uid,
432 ID_R_EQ_R | ID_E_EQ_R | ID_S_EQ_R);
433 }
434
435 /* ARGSUSED */
436 int
437 sys_seteuid(struct lwp *l, void *v, register_t *retval)
438 {
439 struct sys_seteuid_args /* {
440 syscallarg(uid_t) euid;
441 } */ *uap = v;
442
443 return do_setresuid(l, -1, SCARG(uap, euid), -1, ID_E_EQ_R | ID_E_EQ_S);
444 }
445
446 int
447 sys_setreuid(struct lwp *l, void *v, register_t *retval)
448 {
449 struct sys_setreuid_args /* {
450 syscallarg(uid_t) ruid;
451 syscallarg(uid_t) euid;
452 } */ *uap = v;
453 struct proc *p = l->l_proc;
454 uid_t ruid, euid, svuid;
455
456 ruid = SCARG(uap, ruid);
457 euid = SCARG(uap, euid);
458 if (ruid == -1)
459 ruid = p->p_cred->p_ruid;
460 if (euid == -1)
461 euid = p->p_ucred->cr_uid;
462 /* Saved uid is set to the new euid if the ruid changed */
463 svuid = (ruid == p->p_cred->p_ruid) ? -1 : euid;
464
465 return do_setresuid(l, ruid, euid, svuid,
466 ID_R_EQ_R | ID_R_EQ_E |
467 ID_E_EQ_R | ID_E_EQ_E | ID_E_EQ_S |
468 ID_S_EQ_R | ID_S_EQ_E | ID_S_EQ_S);
469 }
470
471 /* ARGSUSED */
472 int
473 sys_setgid(struct lwp *l, void *v, register_t *retval)
474 {
475 struct sys_setgid_args /* {
476 syscallarg(gid_t) gid;
477 } */ *uap = v;
478 gid_t gid = SCARG(uap, gid);
479
480 return do_setresgid(l, gid, gid, gid,
481 ID_R_EQ_R | ID_E_EQ_R | ID_S_EQ_R);
482 }
483
484 /* ARGSUSED */
485 int
486 sys_setegid(struct lwp *l, void *v, register_t *retval)
487 {
488 struct sys_setegid_args /* {
489 syscallarg(gid_t) egid;
490 } */ *uap = v;
491
492 return do_setresgid(l, -1, SCARG(uap, egid), -1, ID_E_EQ_R | ID_E_EQ_S);
493 }
494
495 int
496 sys_setregid(struct lwp *l, void *v, register_t *retval)
497 {
498 struct sys_setregid_args /* {
499 syscallarg(gid_t) rgid;
500 syscallarg(gid_t) egid;
501 } */ *uap = v;
502 struct proc *p = l->l_proc;
503 gid_t rgid, egid, svgid;
504
505 rgid = SCARG(uap, rgid);
506 egid = SCARG(uap, egid);
507 if (rgid == -1)
508 rgid = p->p_cred->p_rgid;
509 if (egid == -1)
510 egid = p->p_ucred->cr_gid;
511 /* Saved gid is set to the new egid if the rgid changed */
512 svgid = rgid == p->p_cred->p_rgid ? -1 : egid;
513
514 return do_setresgid(l, rgid, egid, svgid,
515 ID_R_EQ_R | ID_R_EQ_E |
516 ID_E_EQ_R | ID_E_EQ_E | ID_E_EQ_S |
517 ID_S_EQ_R | ID_S_EQ_E | ID_S_EQ_S);
518 }
519
520 int
521 sys_issetugid(struct lwp *l, void *v, register_t *retval)
522 {
523 struct proc *p = l->l_proc;
524
525 /*
526 * Note: OpenBSD sets a P_SUGIDEXEC flag set at execve() time,
527 * we use P_SUGID because we consider changing the owners as
528 * "tainting" as well.
529 * This is significant for procs that start as root and "become"
530 * a user without an exec - programs cannot know *everything*
531 * that libc *might* have put in their data segment.
532 */
533 *retval = (p->p_flag & P_SUGID) != 0;
534 return (0);
535 }
536
537 /* ARGSUSED */
538 int
539 sys_setgroups(struct lwp *l, void *v, register_t *retval)
540 {
541 struct sys_setgroups_args /* {
542 syscallarg(int) gidsetsize;
543 syscallarg(const gid_t *) gidset;
544 } */ *uap = v;
545 struct proc *p = l->l_proc;
546 struct pcred *pc = p->p_cred;
547 int ngrp;
548 int error;
549 gid_t grp[NGROUPS];
550 size_t grsize;
551
552 if ((error = suser(pc->pc_ucred, &p->p_acflag)) != 0)
553 return (error);
554
555 ngrp = SCARG(uap, gidsetsize);
556 if ((u_int)ngrp > NGROUPS)
557 return (EINVAL);
558
559 grsize = ngrp * sizeof(gid_t);
560 error = copyin(SCARG(uap, gidset), grp, grsize);
561 if (error)
562 return (error);
563 /*
564 * Check if this is a no-op.
565 */
566 if (pc->pc_ucred->cr_ngroups == (u_int) ngrp &&
567 memcmp(grp, pc->pc_ucred->cr_groups, grsize) == 0)
568 return (0);
569
570 pc->pc_ucred = crcopy(pc->pc_ucred);
571 (void)memcpy(pc->pc_ucred->cr_groups, grp, grsize);
572 pc->pc_ucred->cr_ngroups = ngrp;
573 p_sugid(p);
574 return (0);
575 }
576
577 /*
578 * Check if gid is a member of the group set.
579 */
580 int
581 groupmember(gid_t gid, const struct ucred *cred)
582 {
583 const gid_t *gp;
584 const gid_t *egp;
585
586 egp = &(cred->cr_groups[cred->cr_ngroups]);
587 for (gp = cred->cr_groups; gp < egp; gp++)
588 if (*gp == gid)
589 return (1);
590 return (0);
591 }
592
593 /*
594 * Test whether the specified credentials imply "super-user"
595 * privilege; if so, and we have accounting info, set the flag
596 * indicating use of super-powers.
597 * Returns 0 or error.
598 */
599 int
600 suser(const struct ucred *cred, u_short *acflag)
601 {
602
603 if (cred->cr_uid == 0) {
604 if (acflag)
605 *acflag |= ASU;
606 return (0);
607 }
608 return (EPERM);
609 }
610
611 /*
612 * Allocate a zeroed cred structure.
613 */
614 struct ucred *
615 crget(void)
616 {
617 struct ucred *cr;
618
619 MALLOC(cr, struct ucred *, sizeof(*cr), M_CRED, M_WAITOK);
620 memset((caddr_t)cr, 0, sizeof(*cr));
621 cr->cr_ref = 1;
622 return (cr);
623 }
624
625 /*
626 * Free a cred structure.
627 * Throws away space when ref count gets to 0.
628 */
629 void
630 crfree(struct ucred *cr)
631 {
632
633 if (--cr->cr_ref == 0)
634 FREE((caddr_t)cr, M_CRED);
635 }
636
637 /*
638 * Compare cred structures and return 0 if they match
639 */
640 int
641 crcmp(const struct ucred *cr1, const struct uucred *cr2)
642 {
643 return cr1->cr_uid != cr2->cr_uid ||
644 cr1->cr_gid != cr2->cr_gid ||
645 cr1->cr_ngroups != (uint32_t)cr2->cr_ngroups ||
646 memcmp(cr1->cr_groups, cr2->cr_groups, cr1->cr_ngroups);
647 }
648
649 /*
650 * Copy cred structure to a new one and free the old one.
651 */
652 struct ucred *
653 crcopy(struct ucred *cr)
654 {
655 struct ucred *newcr;
656
657 if (cr->cr_ref == 1)
658 return (cr);
659 newcr = crget();
660 *newcr = *cr;
661 crfree(cr);
662 newcr->cr_ref = 1;
663 return (newcr);
664 }
665
666 /*
667 * Dup cred struct to a new held one.
668 */
669 struct ucred *
670 crdup(const struct ucred *cr)
671 {
672 struct ucred *newcr;
673
674 newcr = crget();
675 *newcr = *cr;
676 newcr->cr_ref = 1;
677 return (newcr);
678 }
679
680 /*
681 * convert from userland credentials to kernel one
682 */
683 void
684 crcvt(struct ucred *uc, const struct uucred *uuc)
685 {
686
687 uc->cr_ref = 0;
688 uc->cr_uid = uuc->cr_uid;
689 uc->cr_gid = uuc->cr_gid;
690 uc->cr_ngroups = uuc->cr_ngroups;
691 (void)memcpy(uc->cr_groups, uuc->cr_groups, sizeof(uuc->cr_groups));
692 }
693
694 /*
695 * Get login name, if available.
696 */
697 /* ARGSUSED */
698 int
699 sys___getlogin(struct lwp *l, void *v, register_t *retval)
700 {
701 struct sys___getlogin_args /* {
702 syscallarg(char *) namebuf;
703 syscallarg(size_t) namelen;
704 } */ *uap = v;
705 struct proc *p = l->l_proc;
706
707 if (SCARG(uap, namelen) > sizeof(p->p_pgrp->pg_session->s_login))
708 SCARG(uap, namelen) = sizeof(p->p_pgrp->pg_session->s_login);
709 return (copyout((caddr_t) p->p_pgrp->pg_session->s_login,
710 (caddr_t) SCARG(uap, namebuf), SCARG(uap, namelen)));
711 }
712
713 /*
714 * Set login name.
715 */
716 /* ARGSUSED */
717 int
718 sys___setlogin(struct lwp *l, void *v, register_t *retval)
719 {
720 struct sys___setlogin_args /* {
721 syscallarg(const char *) namebuf;
722 } */ *uap = v;
723 struct proc *p = l->l_proc;
724 struct session *s = p->p_pgrp->pg_session;
725 char newname[sizeof s->s_login + 1];
726 int error;
727
728 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0)
729 return (error);
730 error = copyinstr(SCARG(uap, namebuf), &newname, sizeof newname, NULL);
731 if (error != 0)
732 return (error == ENAMETOOLONG ? EINVAL : error);
733
734 if (s->s_flags & S_LOGIN_SET && p->p_pid != s->s_sid &&
735 strncmp(newname, s->s_login, sizeof s->s_login) != 0)
736 log(LOG_WARNING, "%s (pid %d) changing logname from "
737 "%.*s to %s\n", p->p_comm, p->p_pid,
738 (int)sizeof s->s_login, s->s_login, newname);
739 s->s_flags |= S_LOGIN_SET;
740 strncpy(s->s_login, newname, sizeof s->s_login);
741 return (0);
742 }
Cache object: 1aed2a31c8be1e0e8d5f2eb2f316938d
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