kern_prot.c revision 1.74
1 /* $NetBSD: kern_prot.c,v 1.74 2003/02/18 19:26:23 wiz 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. All advertising materials mentioning features or use of this software 21 * must display the following acknowledgement: 22 * This product includes software developed by the University of 23 * California, Berkeley and its contributors. 24 * 4. Neither the name of the University nor the names of its contributors 25 * may be used to endorse or promote products derived from this software 26 * without specific prior written permission. 27 * 28 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 29 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 30 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 31 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 32 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 33 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 34 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 35 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 36 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 37 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 38 * SUCH DAMAGE. 39 * 40 * @(#)kern_prot.c 8.9 (Berkeley) 2/14/95 41 */ 42 43 /* 44 * System calls related to processes and protection 45 */ 46 47 #include <sys/cdefs.h> 48 __KERNEL_RCSID(0, "$NetBSD: kern_prot.c,v 1.74 2003/02/18 19:26:23 wiz Exp $"); 49 50 #include "opt_compat_43.h" 51 52 #include <sys/param.h> 53 #include <sys/acct.h> 54 #include <sys/systm.h> 55 #include <sys/ucred.h> 56 #include <sys/proc.h> 57 #include <sys/timeb.h> 58 #include <sys/times.h> 59 #include <sys/malloc.h> 60 #include <sys/syslog.h> 61 62 #include <sys/mount.h> 63 #include <sys/sa.h> 64 #include <sys/syscallargs.h> 65 66 MALLOC_DEFINE(M_CRED, "cred", "credentials"); 67 68 int sys_getpid(struct lwp *, void *, register_t *); 69 int sys_getpid_with_ppid(struct lwp *, void *, register_t *); 70 int sys_getuid(struct lwp *, void *, register_t *); 71 int sys_getuid_with_euid(struct lwp *, void *, register_t *); 72 int sys_getgid(struct lwp *, void *, register_t *); 73 int sys_getgid_with_egid(struct lwp *, void *, register_t *); 74 75 /* ARGSUSED */ 76 int 77 sys_getpid(struct lwp *l, void *v, register_t *retval) 78 { 79 struct proc *p = l->l_proc; 80 81 *retval = p->p_pid; 82 return (0); 83 } 84 85 /* ARGSUSED */ 86 int 87 sys_getpid_with_ppid(struct lwp *l, void *v, register_t *retval) 88 { 89 struct proc *p = l->l_proc; 90 91 retval[0] = p->p_pid; 92 retval[1] = p->p_pptr->p_pid; 93 return (0); 94 } 95 96 /* ARGSUSED */ 97 int 98 sys_getppid(struct lwp *l, void *v, register_t *retval) 99 { 100 struct proc *p = l->l_proc; 101 102 *retval = p->p_pptr->p_pid; 103 return (0); 104 } 105 106 /* Get process group ID; note that POSIX getpgrp takes no parameter */ 107 int 108 sys_getpgrp(struct lwp *l, void *v, register_t *retval) 109 { 110 struct proc *p = l->l_proc; 111 112 *retval = p->p_pgrp->pg_id; 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 121 sys_getsid(struct lwp *l, void *v, register_t *retval) 122 { 123 struct sys_getsid_args /* { 124 syscalldarg(pid_t) pid; 125 } */ *uap = v; 126 struct proc *p = l->l_proc; 127 128 if (SCARG(uap, pid) == 0) 129 goto found; 130 if ((p = pfind(SCARG(uap, pid))) == 0) 131 return (ESRCH); 132 found: 133 *retval = p->p_session->s_sid; 134 return (0); 135 } 136 137 int 138 sys_getpgid(struct lwp *l, void *v, register_t *retval) 139 { 140 struct sys_getpgid_args /* { 141 syscallarg(pid_t) pid; 142 } */ *uap = v; 143 struct proc *p = l->l_proc; 144 145 if (SCARG(uap, pid) == 0) 146 goto found; 147 if ((p = pfind(SCARG(uap, pid))) == 0) 148 return (ESRCH); 149 found: 150 *retval = p->p_pgid; 151 return (0); 152 } 153 154 /* ARGSUSED */ 155 int 156 sys_getuid(struct lwp *l, void *v, register_t *retval) 157 { 158 struct proc *p = l->l_proc; 159 160 *retval = p->p_cred->p_ruid; 161 return (0); 162 } 163 164 /* ARGSUSED */ 165 int 166 sys_getuid_with_euid(struct lwp *l, void *v, register_t *retval) 167 { 168 struct proc *p = l->l_proc; 169 170 retval[0] = p->p_cred->p_ruid; 171 retval[1] = p->p_ucred->cr_uid; 172 return (0); 173 } 174 175 /* ARGSUSED */ 176 int 177 sys_geteuid(struct lwp *l, void *v, register_t *retval) 178 { 179 struct proc *p = l->l_proc; 180 181 *retval = p->p_ucred->cr_uid; 182 return (0); 183 } 184 185 /* ARGSUSED */ 186 int 187 sys_getgid(struct lwp *l, void *v, register_t *retval) 188 { 189 struct proc *p = l->l_proc; 190 191 *retval = p->p_cred->p_rgid; 192 return (0); 193 } 194 195 /* ARGSUSED */ 196 int 197 sys_getgid_with_egid(struct lwp *l, void *v, register_t *retval) 198 { 199 struct proc *p = l->l_proc; 200 201 retval[0] = p->p_cred->p_rgid; 202 retval[1] = p->p_ucred->cr_gid; 203 return (0); 204 } 205 206 /* 207 * Get effective group ID. The "egid" is groups[0], and could be obtained 208 * via getgroups. This syscall exists because it is somewhat painful to do 209 * correctly in a library function. 210 */ 211 /* ARGSUSED */ 212 int 213 sys_getegid(struct lwp *l, void *v, register_t *retval) 214 { 215 struct proc *p = l->l_proc; 216 *retval = p->p_ucred->cr_gid; 217 return (0); 218 } 219 220 int 221 sys_getgroups(struct lwp *l, void *v, register_t *retval) 222 { 223 struct sys_getgroups_args /* { 224 syscallarg(int) gidsetsize; 225 syscallarg(gid_t *) gidset; 226 } */ *uap = v; 227 struct proc *p = l->l_proc; 228 struct pcred *pc = p->p_cred; 229 u_int ngrp; 230 int error; 231 232 if (SCARG(uap, gidsetsize) == 0) { 233 *retval = pc->pc_ucred->cr_ngroups; 234 return (0); 235 } else if (SCARG(uap, gidsetsize) < 0) 236 return (EINVAL); 237 ngrp = SCARG(uap, gidsetsize); 238 if (ngrp < pc->pc_ucred->cr_ngroups) 239 return (EINVAL); 240 ngrp = pc->pc_ucred->cr_ngroups; 241 error = copyout((caddr_t)pc->pc_ucred->cr_groups, 242 (caddr_t)SCARG(uap, gidset), ngrp * sizeof(gid_t)); 243 if (error) 244 return (error); 245 *retval = ngrp; 246 return (0); 247 } 248 249 /* ARGSUSED */ 250 int 251 sys_setsid(struct lwp *l, void *v, register_t *retval) 252 { 253 struct proc *p = l->l_proc; 254 255 if (p->p_pgid == p->p_pid || pgfind(p->p_pid)) { 256 return (EPERM); 257 } else { 258 (void)enterpgrp(p, p->p_pid, 1); 259 *retval = p->p_pid; 260 return (0); 261 } 262 } 263 264 /* 265 * set process group (setpgid/old setpgrp) 266 * 267 * caller does setpgid(targpid, targpgid) 268 * 269 * pgid must be in valid range (EINVAL) 270 * pid must be caller or child of caller (ESRCH) 271 * if a child 272 * pid must be in same session (EPERM) 273 * pid can't have done an exec (EACCES) 274 * if pgid != pid 275 * there must exist some pid in same session having pgid (EPERM) 276 * pid must not be session leader (EPERM) 277 */ 278 /* ARGSUSED */ 279 int 280 sys_setpgid(struct lwp *l, void *v, register_t *retval) 281 { 282 struct sys_setpgid_args /* { 283 syscallarg(int) pid; 284 syscallarg(int) pgid; 285 } */ *uap = v; 286 struct proc *curp = l->l_proc; 287 struct proc *targp; /* target process */ 288 struct pgrp *pgrp; /* target pgrp */ 289 290 if (SCARG(uap, pgid) < 0) 291 return (EINVAL); 292 293 if (SCARG(uap, pid) != 0 && SCARG(uap, pid) != curp->p_pid) { 294 if ((targp = pfind(SCARG(uap, pid))) == 0 295 || !inferior(targp, curp)) 296 return (ESRCH); 297 if (targp->p_session != curp->p_session) 298 return (EPERM); 299 if (targp->p_flag & P_EXEC) 300 return (EACCES); 301 } else 302 targp = curp; 303 if (SESS_LEADER(targp)) 304 return (EPERM); 305 if (SCARG(uap, pgid) == 0) 306 SCARG(uap, pgid) = targp->p_pid; 307 else if (SCARG(uap, pgid) != targp->p_pid) 308 if ((pgrp = pgfind(SCARG(uap, pgid))) == 0 || 309 pgrp->pg_session != curp->p_session) 310 return (EPERM); 311 return (enterpgrp(targp, SCARG(uap, pgid), 0)); 312 } 313 314 /* ARGSUSED */ 315 int 316 sys_setuid(struct lwp *l, void *v, register_t *retval) 317 { 318 struct sys_setuid_args /* { 319 syscallarg(uid_t) uid; 320 } */ *uap = v; 321 struct proc *p = l->l_proc; 322 struct pcred *pc = p->p_cred; 323 uid_t uid; 324 int error; 325 326 uid = SCARG(uap, uid); 327 if (uid != pc->p_ruid && 328 (error = suser(pc->pc_ucred, &p->p_acflag))) 329 return (error); 330 /* 331 * Check if we are all set, and this is a no-op. 332 */ 333 if (pc->p_ruid == uid && pc->p_svuid == uid && 334 pc->pc_ucred->cr_uid == uid) 335 return (0); 336 /* 337 * Everything's okay, do it. 338 * Transfer proc count to new user. 339 * Copy credentials so other references do not see our changes. 340 */ 341 (void)chgproccnt(pc->p_ruid, -1); 342 (void)chgproccnt(uid, 1); 343 pc->pc_ucred = crcopy(pc->pc_ucred); 344 pc->pc_ucred->cr_uid = uid; 345 pc->p_ruid = uid; 346 pc->p_svuid = uid; 347 p_sugid(p); 348 return (0); 349 } 350 351 /* ARGSUSED */ 352 int 353 sys_seteuid(struct lwp *l, void *v, register_t *retval) 354 { 355 struct sys_seteuid_args /* { 356 syscallarg(uid_t) euid; 357 } */ *uap = v; 358 struct proc *p = l->l_proc; 359 struct pcred *pc = p->p_cred; 360 uid_t euid; 361 int error; 362 363 euid = SCARG(uap, euid); 364 if (euid != pc->p_ruid && euid != pc->p_svuid && 365 (error = suser(pc->pc_ucred, &p->p_acflag))) 366 return (error); 367 /* 368 * Check if we are all set, and this is a no-op. 369 */ 370 if (pc->pc_ucred->cr_uid == euid) 371 return (0); 372 373 /* 374 * Everything's okay, do it. Copy credentials so other references do 375 * not see our changes. 376 */ 377 pc->pc_ucred = crcopy(pc->pc_ucred); 378 pc->pc_ucred->cr_uid = euid; 379 p_sugid(p); 380 return (0); 381 } 382 383 int 384 sys_setreuid(struct lwp *l, void *v, register_t *retval) 385 { 386 struct sys_setreuid_args /* { 387 syscallarg(uid_t) ruid; 388 syscallarg(uid_t) euid; 389 } */ *uap = v; 390 struct proc *p = l->l_proc; 391 struct pcred *pc = p->p_cred; 392 uid_t ruid, euid; 393 int error, changed = 0; 394 395 ruid = SCARG(uap, ruid); 396 euid = SCARG(uap, euid); 397 398 if (ruid != (uid_t)-1 && 399 ruid != pc->p_ruid && ruid != pc->pc_ucred->cr_uid && 400 (error = suser(pc->pc_ucred, &p->p_acflag))) 401 return (error); 402 403 if (euid != (uid_t)-1 && 404 euid != pc->p_ruid && euid != pc->pc_ucred->cr_uid && 405 euid != pc->p_svuid && 406 (error = suser(pc->pc_ucred, &p->p_acflag))) 407 return (error); 408 409 if (euid != (uid_t)-1 && euid != pc->pc_ucred->cr_uid) { 410 pc->pc_ucred = crcopy(pc->pc_ucred); 411 pc->pc_ucred->cr_uid = euid; 412 changed++; 413 } 414 415 if (ruid != (uid_t)-1 && 416 (pc->p_ruid != ruid || pc->p_svuid != pc->pc_ucred->cr_uid)) { 417 (void)chgproccnt(pc->p_ruid, -1); 418 (void)chgproccnt(ruid, 1); 419 pc->p_ruid = ruid; 420 pc->p_svuid = pc->pc_ucred->cr_uid; 421 changed++; 422 } 423 424 if (changed) 425 p_sugid(p); 426 return (0); 427 } 428 429 /* ARGSUSED */ 430 int 431 sys_setgid(struct lwp *l, void *v, register_t *retval) 432 { 433 struct sys_setgid_args /* { 434 syscallarg(gid_t) gid; 435 } */ *uap = v; 436 struct proc *p = l->l_proc; 437 struct pcred *pc = p->p_cred; 438 gid_t gid; 439 int error; 440 441 gid = SCARG(uap, gid); 442 if (gid != pc->p_rgid && 443 (error = suser(pc->pc_ucred, &p->p_acflag))) 444 return (error); 445 /* 446 * Check if we are all set, and this is a no-op. 447 */ 448 if (pc->pc_ucred->cr_gid == gid && pc->p_rgid == gid && 449 pc->p_svgid == gid) 450 return (0); 451 452 pc->pc_ucred = crcopy(pc->pc_ucred); 453 pc->pc_ucred->cr_gid = gid; 454 pc->p_rgid = gid; 455 pc->p_svgid = gid; 456 p_sugid(p); 457 return (0); 458 } 459 460 /* ARGSUSED */ 461 int 462 sys_setegid(struct lwp *l, void *v, register_t *retval) 463 { 464 struct sys_setegid_args /* { 465 syscallarg(gid_t) egid; 466 } */ *uap = v; 467 struct proc *p = l->l_proc; 468 struct pcred *pc = p->p_cred; 469 gid_t egid; 470 int error; 471 472 egid = SCARG(uap, egid); 473 if (egid != pc->p_rgid && egid != pc->p_svgid && 474 (error = suser(pc->pc_ucred, &p->p_acflag))) 475 return (error); 476 /* 477 * Check if we are all set, and this is a no-op. 478 */ 479 if (pc->pc_ucred->cr_gid == egid) 480 return (0); 481 482 pc->pc_ucred = crcopy(pc->pc_ucred); 483 pc->pc_ucred->cr_gid = egid; 484 p_sugid(p); 485 return (0); 486 } 487 488 int 489 sys_setregid(struct lwp *l, void *v, register_t *retval) 490 { 491 struct sys_setregid_args /* { 492 syscallarg(gid_t) rgid; 493 syscallarg(gid_t) egid; 494 } */ *uap = v; 495 struct proc *p = l->l_proc; 496 struct pcred *pc = p->p_cred; 497 gid_t rgid, egid; 498 int error, changed = 0; 499 500 rgid = SCARG(uap, rgid); 501 egid = SCARG(uap, egid); 502 503 if (rgid != (gid_t)-1 && 504 rgid != pc->p_rgid && rgid != pc->pc_ucred->cr_gid && 505 (error = suser(pc->pc_ucred, &p->p_acflag))) 506 return (error); 507 508 if (egid != (gid_t)-1 && 509 egid != pc->p_rgid && egid != pc->pc_ucred->cr_gid && 510 egid != pc->p_svgid && 511 (error = suser(pc->pc_ucred, &p->p_acflag))) 512 return (error); 513 514 if (egid != (gid_t)-1 && pc->pc_ucred->cr_gid != egid) { 515 pc->pc_ucred = crcopy(pc->pc_ucred); 516 pc->pc_ucred->cr_gid = egid; 517 changed++; 518 } 519 520 if (rgid != (gid_t)-1 && 521 (pc->p_rgid != rgid || pc->p_svgid != pc->pc_ucred->cr_gid)) { 522 pc->p_rgid = rgid; 523 pc->p_svgid = pc->pc_ucred->cr_gid; 524 changed++; 525 } 526 527 if (changed) 528 p_sugid(p); 529 return (0); 530 } 531 532 int 533 sys_issetugid(struct lwp *l, void *v, register_t *retval) 534 { 535 struct proc *p = l->l_proc; 536 /* 537 * Note: OpenBSD sets a P_SUGIDEXEC flag set at execve() time, 538 * we use P_SUGID because we consider changing the owners as 539 * "tainting" as well. 540 * This is significant for procs that start as root and "become" 541 * a user without an exec - programs cannot know *everything* 542 * that libc *might* have put in their data segment. 543 */ 544 *retval = (p->p_flag & P_SUGID) != 0; 545 return (0); 546 } 547 548 /* ARGSUSED */ 549 int 550 sys_setgroups(struct lwp *l, void *v, register_t *retval) 551 { 552 struct sys_setgroups_args /* { 553 syscallarg(int) gidsetsize; 554 syscallarg(const gid_t *) gidset; 555 } */ *uap = v; 556 struct proc *p = l->l_proc; 557 struct pcred *pc = p->p_cred; 558 int ngrp; 559 int error; 560 gid_t grp[NGROUPS]; 561 size_t grsize; 562 563 if ((error = suser(pc->pc_ucred, &p->p_acflag)) != 0) 564 return (error); 565 566 ngrp = SCARG(uap, gidsetsize); 567 if ((u_int)ngrp > NGROUPS) 568 return (EINVAL); 569 570 grsize = ngrp * sizeof(gid_t); 571 error = copyin(SCARG(uap, gidset), grp, grsize); 572 if (error) 573 return (error); 574 /* 575 * Check if this is a no-op. 576 */ 577 if (pc->pc_ucred->cr_ngroups == (u_int) ngrp && 578 memcmp(grp, pc->pc_ucred->cr_groups, grsize) == 0) 579 return (0); 580 581 pc->pc_ucred = crcopy(pc->pc_ucred); 582 (void)memcpy(pc->pc_ucred->cr_groups, grp, grsize); 583 pc->pc_ucred->cr_ngroups = ngrp; 584 p_sugid(p); 585 return (0); 586 } 587 588 /* 589 * Check if gid is a member of the group set. 590 */ 591 int 592 groupmember(gid_t gid, const struct ucred *cred) 593 { 594 const gid_t *gp; 595 const gid_t *egp; 596 597 egp = &(cred->cr_groups[cred->cr_ngroups]); 598 for (gp = cred->cr_groups; gp < egp; gp++) 599 if (*gp == gid) 600 return (1); 601 return (0); 602 } 603 604 /* 605 * Test whether the specified credentials imply "super-user" 606 * privilege; if so, and we have accounting info, set the flag 607 * indicating use of super-powers. 608 * Returns 0 or error. 609 */ 610 int 611 suser(const struct ucred *cred, u_short *acflag) 612 { 613 if (cred->cr_uid == 0) { 614 if (acflag) 615 *acflag |= ASU; 616 return (0); 617 } 618 return (EPERM); 619 } 620 621 /* 622 * Allocate a zeroed cred structure. 623 */ 624 struct ucred * 625 crget(void) 626 { 627 struct ucred *cr; 628 629 MALLOC(cr, struct ucred *, sizeof(*cr), M_CRED, M_WAITOK); 630 memset((caddr_t)cr, 0, sizeof(*cr)); 631 cr->cr_ref = 1; 632 return (cr); 633 } 634 635 /* 636 * Free a cred structure. 637 * Throws away space when ref count gets to 0. 638 */ 639 void 640 crfree(struct ucred *cr) 641 { 642 643 if (--cr->cr_ref == 0) 644 FREE((caddr_t)cr, M_CRED); 645 } 646 647 /* 648 * Copy cred structure to a new one and free the old one. 649 */ 650 struct ucred * 651 crcopy(struct ucred *cr) 652 { 653 struct ucred *newcr; 654 655 if (cr->cr_ref == 1) 656 return (cr); 657 newcr = crget(); 658 *newcr = *cr; 659 crfree(cr); 660 newcr->cr_ref = 1; 661 return (newcr); 662 } 663 664 /* 665 * Dup cred struct to a new held one. 666 */ 667 struct ucred * 668 crdup(const struct ucred *cr) 669 { 670 struct ucred *newcr; 671 672 newcr = crget(); 673 *newcr = *cr; 674 newcr->cr_ref = 1; 675 return (newcr); 676 } 677 678 /* 679 * convert from userland credentials to kernel one 680 */ 681 void 682 crcvt(struct ucred *uc, const struct uucred *uuc) 683 { 684 uc->cr_ref = 0; 685 uc->cr_uid = uuc->cr_uid; 686 uc->cr_gid = uuc->cr_gid; 687 uc->cr_ngroups = uuc->cr_ngroups; 688 (void)memcpy(uc->cr_groups, uuc->cr_groups, sizeof(uuc->cr_groups)); 689 } 690 691 /* 692 * Get login name, if available. 693 */ 694 /* ARGSUSED */ 695 int 696 sys___getlogin(struct lwp *l, void *v, register_t *retval) 697 { 698 struct sys___getlogin_args /* { 699 syscallarg(char *) namebuf; 700 syscallarg(size_t) namelen; 701 } */ *uap = v; 702 struct proc *p = l->l_proc; 703 704 if (SCARG(uap, namelen) > sizeof(p->p_pgrp->pg_session->s_login)) 705 SCARG(uap, namelen) = sizeof(p->p_pgrp->pg_session->s_login); 706 return (copyout((caddr_t) p->p_pgrp->pg_session->s_login, 707 (caddr_t) SCARG(uap, namebuf), SCARG(uap, namelen))); 708 } 709 710 /* 711 * Set login name. 712 */ 713 /* ARGSUSED */ 714 int 715 sys___setlogin(struct lwp *l, void *v, register_t *retval) 716 { 717 struct sys___setlogin_args /* { 718 syscallarg(const char *) namebuf; 719 } */ *uap = v; 720 struct proc *p = l->l_proc; 721 struct session *s = p->p_pgrp->pg_session; 722 char newname[sizeof s->s_login + 1]; 723 int error; 724 725 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 726 return (error); 727 error = copyinstr(SCARG(uap, namebuf), &newname, sizeof newname, NULL); 728 if (error != 0) 729 return error == ENAMETOOLONG ? EINVAL : error; 730 731 if (s->s_flags & S_LOGIN_SET && p->p_pid != s->s_sid && 732 strncmp(newname, s->s_login, sizeof s->s_login) != 0) 733 log(LOG_WARNING, "%s (pid %d) changing logname from " 734 "%.*s to %s\n", p->p_comm, p->p_pid, 735 (int)sizeof s->s_login, s->s_login, newname); 736 s->s_flags |= S_LOGIN_SET; 737 strncpy(s->s_login, newname, sizeof s->s_login); 738 return 0; 739 } 740
Indexes created Sun Sep 21 20:09:37 GMT 2025