kern_prot.c revision 1.101
1 /* $NetBSD: kern_prot.c,v 1.101 2007/03/09 14:11:25 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 1.101 2007/03/09 14:11:25 ad 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/pool.h> 56 #include <sys/syslog.h> 57 #include <sys/resourcevar.h> 58 #include <sys/kauth.h> 59 60 #include <sys/mount.h> 61 #include <sys/syscallargs.h> 62 63 #include <sys/malloc.h> 64 65 int sys_getpid(struct lwp *, void *, register_t *); 66 int sys_getpid_with_ppid(struct lwp *, void *, register_t *); 67 int sys_getuid(struct lwp *, void *, register_t *); 68 int sys_getuid_with_euid(struct lwp *, void *, register_t *); 69 int sys_getgid(struct lwp *, void *, register_t *); 70 int sys_getgid_with_egid(struct lwp *, void *, register_t *); 71 72 static int grsortu(gid_t *, int); 73 74 /* ARGSUSED */ 75 int 76 sys_getpid(struct lwp *l, void *v, register_t *retval) 77 { 78 struct proc *p = l->l_proc; 79 80 *retval = p->p_pid; 81 return (0); 82 } 83 84 /* ARGSUSED */ 85 int 86 sys_getpid_with_ppid(struct lwp *l, void *v, register_t *retval) 87 { 88 struct proc *p = l->l_proc; 89 90 retval[0] = p->p_pid; 91 mutex_enter(&proclist_lock); 92 retval[1] = p->p_pptr->p_pid; 93 mutex_exit(&proclist_lock); 94 return (0); 95 } 96 97 /* ARGSUSED */ 98 int 99 sys_getppid(struct lwp *l, void *v, register_t *retval) 100 { 101 struct proc *p = l->l_proc; 102 103 mutex_enter(&proclist_lock); 104 *retval = p->p_pptr->p_pid; 105 mutex_exit(&proclist_lock); 106 return (0); 107 } 108 109 /* Get process group ID; note that POSIX getpgrp takes no parameter */ 110 int 111 sys_getpgrp(struct lwp *l, void *v, register_t *retval) 112 { 113 struct proc *p = l->l_proc; 114 115 mutex_enter(&proclist_lock); 116 *retval = p->p_pgrp->pg_id; 117 mutex_exit(&proclist_lock); 118 return (0); 119 } 120 121 /* 122 * Return the process group ID of the session leader (session ID) 123 * for the specified process. 124 */ 125 int 126 sys_getsid(struct lwp *l, void *v, register_t *retval) 127 { 128 struct sys_getsid_args /* { 129 syscalldarg(pid_t) pid; 130 } */ *uap = v; 131 pid_t pid = SCARG(uap, pid); 132 struct proc *p; 133 int error = 0; 134 135 mutex_enter(&proclist_lock); 136 if (pid == 0) 137 *retval = l->l_proc->p_session->s_sid; 138 else if ((p = p_find(pid, PFIND_LOCKED)) != NULL) 139 *retval = p->p_session->s_sid; 140 else 141 error = ESRCH; 142 mutex_exit(&proclist_lock); 143 144 return error; 145 } 146 147 int 148 sys_getpgid(struct lwp *l, void *v, register_t *retval) 149 { 150 struct sys_getpgid_args /* { 151 syscallarg(pid_t) pid; 152 } */ *uap = v; 153 pid_t pid = SCARG(uap, pid); 154 struct proc *p; 155 int error = 0; 156 157 mutex_enter(&proclist_lock); 158 if (pid == 0) 159 *retval = l->l_proc->p_pgid; 160 else if ((p = p_find(pid, PFIND_LOCKED)) != NULL) 161 *retval = p->p_pgid; 162 else 163 error = ESRCH; 164 mutex_exit(&proclist_lock); 165 166 return error; 167 } 168 169 /* ARGSUSED */ 170 int 171 sys_getuid(struct lwp *l, void *v, register_t *retval) 172 { 173 174 *retval = kauth_cred_getuid(l->l_cred); 175 return (0); 176 } 177 178 /* ARGSUSED */ 179 int 180 sys_getuid_with_euid(struct lwp *l, void *v, register_t *retval) 181 { 182 183 retval[0] = kauth_cred_getuid(l->l_cred); 184 retval[1] = kauth_cred_geteuid(l->l_cred); 185 return (0); 186 } 187 188 /* ARGSUSED */ 189 int 190 sys_geteuid(struct lwp *l, void *v, register_t *retval) 191 { 192 193 *retval = kauth_cred_geteuid(l->l_cred); 194 return (0); 195 } 196 197 /* ARGSUSED */ 198 int 199 sys_getgid(struct lwp *l, void *v, register_t *retval) 200 { 201 202 *retval = kauth_cred_getgid(l->l_cred); 203 return (0); 204 } 205 206 /* ARGSUSED */ 207 int 208 sys_getgid_with_egid(struct lwp *l, void *v, register_t *retval) 209 { 210 211 retval[0] = kauth_cred_getgid(l->l_cred); 212 retval[1] = kauth_cred_getegid(l->l_cred); 213 return (0); 214 } 215 216 /* 217 * Get effective group ID. The "egid" is groups[0], and could be obtained 218 * via getgroups. This syscall exists because it is somewhat painful to do 219 * correctly in a library function. 220 */ 221 /* ARGSUSED */ 222 int 223 sys_getegid(struct lwp *l, void *v, register_t *retval) 224 { 225 226 *retval = kauth_cred_getegid(l->l_cred); 227 return (0); 228 } 229 230 int 231 sys_getgroups(struct lwp *l, void *v, register_t *retval) 232 { 233 struct sys_getgroups_args /* { 234 syscallarg(int) gidsetsize; 235 syscallarg(gid_t *) gidset; 236 } */ *uap = v; 237 kauth_cred_t cred = l->l_cred; 238 u_int ngrp; 239 int error; 240 gid_t *grbuf; 241 242 if (SCARG(uap, gidsetsize) == 0) { 243 *retval = kauth_cred_ngroups(cred); 244 return (0); 245 } else if (SCARG(uap, gidsetsize) < 0) 246 return (EINVAL); 247 ngrp = SCARG(uap, gidsetsize); 248 if (ngrp < kauth_cred_ngroups(cred)) 249 return (EINVAL); 250 ngrp = kauth_cred_ngroups(cred); 251 252 grbuf = malloc(ngrp * sizeof(*grbuf), M_TEMP, M_WAITOK); 253 kauth_cred_getgroups(cred, grbuf, ngrp); 254 error = copyout(grbuf, (void *)SCARG(uap, gidset), 255 ngrp * sizeof(gid_t)); 256 free(grbuf, M_TEMP); 257 if (error) 258 return (error); 259 *retval = ngrp; 260 return (0); 261 } 262 263 /* ARGSUSED */ 264 int 265 sys_setsid(struct lwp *l, void *v, register_t *retval) 266 { 267 struct proc *p = l->l_proc; 268 int error; 269 270 error = enterpgrp(p, p->p_pid, p->p_pid, 1); 271 *retval = p->p_pid; 272 return (error); 273 } 274 275 276 /* 277 * set process group (setpgid/old setpgrp) 278 * 279 * caller does setpgid(targpid, targpgid) 280 * 281 * pgid must be in valid range (EINVAL) 282 * pid must be caller or child of caller (ESRCH) 283 * if a child 284 * pid must be in same session (EPERM) 285 * pid can't have done an exec (EACCES) 286 * if pgid != pid 287 * there must exist some pid in same session having pgid (EPERM) 288 * pid must not be session leader (EPERM) 289 * 290 * Permission checks now in enterpgrp() 291 */ 292 /* ARGSUSED */ 293 int 294 sys_setpgid(struct lwp *l, void *v, register_t *retval) 295 { 296 struct sys_setpgid_args /* { 297 syscallarg(int) pid; 298 syscallarg(int) pgid; 299 } */ *uap = v; 300 struct proc *p = l->l_proc; 301 pid_t targp, pgid; 302 303 if (SCARG(uap, pgid) < 0) 304 return EINVAL; 305 if ((targp = SCARG(uap, pid)) == 0) 306 targp = p->p_pid; 307 if ((pgid = SCARG(uap, pgid)) == 0) 308 pgid = targp; 309 310 return enterpgrp(p, targp, pgid, 0); 311 } 312 313 /* 314 * Set real, effective and saved uids to the requested values. 315 * non-root callers can only ever change uids to values that match 316 * one of the processes current uid values. 317 * This is further restricted by the flags argument. 318 */ 319 320 int 321 do_setresuid(struct lwp *l, uid_t r, uid_t e, uid_t sv, u_int flags) 322 { 323 struct proc *p = l->l_proc; 324 kauth_cred_t cred, ncred; 325 326 ncred = kauth_cred_alloc(); 327 328 /* Get a write lock on the process credential. */ 329 proc_crmod_enter(); 330 cred = p->p_cred; 331 332 /* 333 * Check that the new value is one of the allowed existing values, 334 * or that we have root privilege. 335 */ 336 if ((r != -1 337 && !((flags & ID_R_EQ_R) && r == kauth_cred_getuid(cred)) 338 && !((flags & ID_R_EQ_E) && r == kauth_cred_geteuid(cred)) 339 && !((flags & ID_R_EQ_S) && r == kauth_cred_getsvuid(cred))) || 340 (e != -1 341 && !((flags & ID_E_EQ_R) && e == kauth_cred_getuid(cred)) 342 && !((flags & ID_E_EQ_E) && e == kauth_cred_geteuid(cred)) 343 && !((flags & ID_E_EQ_S) && e == kauth_cred_getsvuid(cred))) || 344 (sv != -1 345 && !((flags & ID_S_EQ_R) && sv == kauth_cred_getuid(cred)) 346 && !((flags & ID_S_EQ_E) && sv == kauth_cred_geteuid(cred)) 347 && !((flags & ID_S_EQ_S) && sv == kauth_cred_getsvuid(cred)))) { 348 int error; 349 350 error = kauth_authorize_process(cred, KAUTH_PROCESS_SETID, 351 p, NULL, NULL, NULL); 352 if (error != 0) { 353 proc_crmod_leave(cred, ncred, false); 354 return error; 355 } 356 } 357 358 /* If nothing has changed, short circuit the request */ 359 if ((r == -1 || r == kauth_cred_getuid(cred)) 360 && (e == -1 || e == kauth_cred_geteuid(cred)) 361 && (sv == -1 || sv == kauth_cred_getsvuid(cred))) { 362 proc_crmod_leave(cred, ncred, false); 363 return 0; 364 } 365 366 kauth_cred_clone(cred, ncred); 367 368 if (r != -1 && r != kauth_cred_getuid(ncred)) { 369 /* Update count of processes for this user */ 370 (void)chgproccnt(kauth_cred_getuid(ncred), -1); 371 (void)chgproccnt(r, 1); 372 kauth_cred_setuid(ncred, r); 373 } 374 if (sv != -1) 375 kauth_cred_setsvuid(ncred, sv); 376 if (e != -1) 377 kauth_cred_seteuid(ncred, e); 378 379 /* Broadcast our credentials to the process and other LWPs. */ 380 proc_crmod_leave(ncred, cred, true); 381 382 return 0; 383 } 384 385 /* 386 * Set real, effective and saved gids to the requested values. 387 * non-root callers can only ever change gids to values that match 388 * one of the processes current gid values. 389 * This is further restricted by the flags argument. 390 */ 391 392 int 393 do_setresgid(struct lwp *l, gid_t r, gid_t e, gid_t sv, u_int flags) 394 { 395 struct proc *p = l->l_proc; 396 kauth_cred_t cred, ncred; 397 398 ncred = kauth_cred_alloc(); 399 400 /* Get a write lock on the process credential. */ 401 proc_crmod_enter(); 402 cred = p->p_cred; 403 404 /* 405 * check new value is one of the allowed existing values. 406 * otherwise, check if we have root privilege. 407 */ 408 if ((r != -1 409 && !((flags & ID_R_EQ_R) && r == kauth_cred_getgid(cred)) 410 && !((flags & ID_R_EQ_E) && r == kauth_cred_getegid(cred)) 411 && !((flags & ID_R_EQ_S) && r == kauth_cred_getsvgid(cred))) || 412 (e != -1 413 && !((flags & ID_E_EQ_R) && e == kauth_cred_getgid(cred)) 414 && !((flags & ID_E_EQ_E) && e == kauth_cred_getegid(cred)) 415 && !((flags & ID_E_EQ_S) && e == kauth_cred_getsvgid(cred))) || 416 (sv != -1 417 && !((flags & ID_S_EQ_R) && sv == kauth_cred_getgid(cred)) 418 && !((flags & ID_S_EQ_E) && sv == kauth_cred_getegid(cred)) 419 && !((flags & ID_S_EQ_S) && sv == kauth_cred_getsvgid(cred)))) { 420 int error; 421 422 error = kauth_authorize_process(cred, KAUTH_PROCESS_SETID, 423 p, NULL, NULL, NULL); 424 if (error != 0) { 425 proc_crmod_leave(cred, ncred, false); 426 return error; 427 } 428 } 429 430 /* If nothing has changed, short circuit the request */ 431 if ((r == -1 || r == kauth_cred_getgid(cred)) 432 && (e == -1 || e == kauth_cred_getegid(cred)) 433 && (sv == -1 || sv == kauth_cred_getsvgid(cred))) { 434 proc_crmod_leave(cred, ncred, false); 435 return 0; 436 } 437 438 kauth_cred_clone(cred, ncred); 439 440 if (r != -1) 441 kauth_cred_setgid(ncred, r); 442 if (sv != -1) 443 kauth_cred_setsvgid(ncred, sv); 444 if (e != -1) 445 kauth_cred_setegid(ncred, e); 446 447 /* Broadcast our credentials to the process and other LWPs. */ 448 proc_crmod_leave(ncred, cred, true); 449 450 return 0; 451 } 452 453 /* ARGSUSED */ 454 int 455 sys_setuid(struct lwp *l, void *v, register_t *retval) 456 { 457 struct sys_setuid_args /* { 458 syscallarg(uid_t) uid; 459 } */ *uap = v; 460 uid_t uid = SCARG(uap, uid); 461 462 return do_setresuid(l, uid, uid, uid, 463 ID_R_EQ_R | ID_E_EQ_R | ID_S_EQ_R); 464 } 465 466 /* ARGSUSED */ 467 int 468 sys_seteuid(struct lwp *l, void *v, register_t *retval) 469 { 470 struct sys_seteuid_args /* { 471 syscallarg(uid_t) euid; 472 } */ *uap = v; 473 474 return do_setresuid(l, -1, SCARG(uap, euid), -1, ID_E_EQ_R | ID_E_EQ_S); 475 } 476 477 int 478 sys_setreuid(struct lwp *l, void *v, register_t *retval) 479 { 480 struct sys_setreuid_args /* { 481 syscallarg(uid_t) ruid; 482 syscallarg(uid_t) euid; 483 } */ *uap = v; 484 kauth_cred_t cred = l->l_cred; 485 uid_t ruid, euid, svuid; 486 487 ruid = SCARG(uap, ruid); 488 euid = SCARG(uap, euid); 489 490 if (ruid == -1) 491 ruid = kauth_cred_getuid(cred); 492 if (euid == -1) 493 euid = kauth_cred_geteuid(cred); 494 495 /* Saved uid is set to the new euid if the ruid changed */ 496 svuid = (ruid == kauth_cred_getuid(cred)) ? -1 : euid; 497 498 return do_setresuid(l, ruid, euid, svuid, 499 ID_R_EQ_R | ID_R_EQ_E | 500 ID_E_EQ_R | ID_E_EQ_E | ID_E_EQ_S | 501 ID_S_EQ_R | ID_S_EQ_E | ID_S_EQ_S); 502 } 503 504 /* ARGSUSED */ 505 int 506 sys_setgid(struct lwp *l, void *v, register_t *retval) 507 { 508 struct sys_setgid_args /* { 509 syscallarg(gid_t) gid; 510 } */ *uap = v; 511 gid_t gid = SCARG(uap, gid); 512 513 return do_setresgid(l, gid, gid, gid, 514 ID_R_EQ_R | ID_E_EQ_R | ID_S_EQ_R); 515 } 516 517 /* ARGSUSED */ 518 int 519 sys_setegid(struct lwp *l, void *v, register_t *retval) 520 { 521 struct sys_setegid_args /* { 522 syscallarg(gid_t) egid; 523 } */ *uap = v; 524 525 return do_setresgid(l, -1, SCARG(uap, egid), -1, ID_E_EQ_R | ID_E_EQ_S); 526 } 527 528 int 529 sys_setregid(struct lwp *l, void *v, register_t *retval) 530 { 531 struct sys_setregid_args /* { 532 syscallarg(gid_t) rgid; 533 syscallarg(gid_t) egid; 534 } */ *uap = v; 535 kauth_cred_t cred = l->l_cred; 536 gid_t rgid, egid, svgid; 537 538 rgid = SCARG(uap, rgid); 539 egid = SCARG(uap, egid); 540 541 if (rgid == -1) 542 rgid = kauth_cred_getgid(cred); 543 if (egid == -1) 544 egid = kauth_cred_getegid(cred); 545 546 /* Saved gid is set to the new egid if the rgid changed */ 547 svgid = rgid == kauth_cred_getgid(cred) ? -1 : egid; 548 549 return do_setresgid(l, rgid, egid, svgid, 550 ID_R_EQ_R | ID_R_EQ_E | 551 ID_E_EQ_R | ID_E_EQ_E | ID_E_EQ_S | 552 ID_S_EQ_R | ID_S_EQ_E | ID_S_EQ_S); 553 } 554 555 int 556 sys_issetugid(struct lwp *l, void *v, register_t *retval) 557 { 558 struct proc *p = l->l_proc; 559 560 /* 561 * Note: OpenBSD sets a P_SUGIDEXEC flag set at execve() time, 562 * we use PK_SUGID because we consider changing the owners as 563 * "tainting" as well. 564 * This is significant for procs that start as root and "become" 565 * a user without an exec - programs cannot know *everything* 566 * that libc *might* have put in their data segment. 567 */ 568 *retval = (p->p_flag & PK_SUGID) != 0; 569 return (0); 570 } 571 572 /* 573 * sort -u for groups. 574 */ 575 static int 576 grsortu(gid_t *grp, int ngrp) 577 { 578 const gid_t *src, *end; 579 gid_t *dst; 580 gid_t group; 581 int i, j; 582 583 /* bubble sort */ 584 for (i = 0; i < ngrp; i++) 585 for (j = i + 1; j < ngrp; j++) 586 if (grp[i] > grp[j]) { 587 gid_t tmp = grp[i]; 588 grp[i] = grp[j]; 589 grp[j] = tmp; 590 } 591 592 /* uniq */ 593 end = grp + ngrp; 594 src = grp; 595 dst = grp; 596 while (src < end) { 597 group = *src++; 598 while (src < end && *src == group) 599 src++; 600 *dst++ = group; 601 } 602 603 #ifdef DIAGNOSTIC 604 /* zero out the rest of the array */ 605 (void)memset(dst, 0, sizeof(*grp) * (end - dst)); 606 #endif 607 608 return dst - grp; 609 } 610 611 /* ARGSUSED */ 612 int 613 sys_setgroups(struct lwp *l, void *v, register_t *retval) 614 { 615 struct sys_setgroups_args /* { 616 syscallarg(int) gidsetsize; 617 syscallarg(const gid_t *) gidset; 618 } */ *uap = v; 619 kauth_cred_t cred, ncred; 620 struct proc *p = l->l_proc; 621 int ngrp; 622 int error; 623 gid_t grp[NGROUPS]; 624 size_t grsize; 625 626 ngrp = SCARG(uap, gidsetsize); 627 if ((u_int)ngrp > NGROUPS) 628 return EINVAL; 629 630 grsize = ngrp * sizeof(gid_t); 631 error = copyin(SCARG(uap, gidset), grp, grsize); 632 if (error) 633 return error; 634 635 ncred = kauth_cred_alloc(); 636 proc_crmod_enter(); 637 cred = p->p_cred; 638 639 if ((error = kauth_authorize_process(cred, KAUTH_PROCESS_SETID, 640 p, NULL, NULL, NULL)) != 0) 641 goto bad; 642 643 ngrp = grsortu(grp, ngrp); 644 kauth_cred_clone(cred, ncred); 645 kauth_cred_setgroups(ncred, grp, ngrp, -1); 646 647 /* Broadcast our credentials to the process and other LWPs. */ 648 proc_crmod_leave(ncred, cred, true); 649 650 return (0); 651 bad: 652 proc_crmod_leave(cred, ncred, false); 653 return (error); 654 } 655 656 /* 657 * Get login name, if available. 658 */ 659 /* ARGSUSED */ 660 int 661 sys___getlogin(struct lwp *l, void *v, register_t *retval) 662 { 663 struct sys___getlogin_args /* { 664 syscallarg(char *) namebuf; 665 syscallarg(size_t) namelen; 666 } */ *uap = v; 667 struct proc *p = l->l_proc; 668 char login[sizeof(p->p_session->s_login)]; 669 int namelen = SCARG(uap, namelen); 670 671 if (namelen > sizeof(login)) 672 namelen = sizeof(login); 673 mutex_enter(&proclist_lock); 674 memcpy(login, p->p_session->s_login, namelen); 675 mutex_exit(&proclist_lock); 676 return (copyout(login, (void *)SCARG(uap, namebuf), namelen)); 677 } 678 679 /* 680 * Set login name. 681 */ 682 /* ARGSUSED */ 683 int 684 sys___setlogin(struct lwp *l, void *v, register_t *retval) 685 { 686 struct sys___setlogin_args /* { 687 syscallarg(const char *) namebuf; 688 } */ *uap = v; 689 struct proc *p = l->l_proc; 690 struct session *sp; 691 char newname[sizeof sp->s_login + 1]; 692 int error; 693 694 if ((error = kauth_authorize_process(l->l_cred, KAUTH_PROCESS_SETID, 695 p, NULL, NULL, NULL)) != 0) 696 return (error); 697 error = copyinstr(SCARG(uap, namebuf), &newname, sizeof newname, NULL); 698 if (error != 0) 699 return (error == ENAMETOOLONG ? EINVAL : error); 700 701 mutex_enter(&proclist_lock); 702 sp = p->p_session; 703 if (sp->s_flags & S_LOGIN_SET && p->p_pid != sp->s_sid && 704 strncmp(newname, sp->s_login, sizeof sp->s_login) != 0) 705 log(LOG_WARNING, "%s (pid %d) changing logname from " 706 "%.*s to %s\n", p->p_comm, p->p_pid, 707 (int)sizeof sp->s_login, sp->s_login, newname); 708 sp->s_flags |= S_LOGIN_SET; 709 strncpy(sp->s_login, newname, sizeof sp->s_login); 710 mutex_exit(&proclist_lock); 711 return (0); 712 } 713 714
Indexes created Mon Sep 22 10:09:38 GMT 2025