kern_prot.c revision 1.76
1 /* $NetBSD: kern_prot.c,v 1.76 2003/03/05 18:42:19 dsl 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 1.76 2003/03/05 18:42:19 dsl 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; 216 217 *retval = p->p_ucred->cr_gid; 218 return (0); 219 } 220 221 int 222 sys_getgroups(struct lwp *l, void *v, register_t *retval) 223 { 224 struct sys_getgroups_args /* { 225 syscallarg(int) gidsetsize; 226 syscallarg(gid_t *) gidset; 227 } */ *uap = v; 228 struct proc *p = l->l_proc; 229 struct pcred *pc = p->p_cred; 230 u_int ngrp; 231 int error; 232 233 if (SCARG(uap, gidsetsize) == 0) { 234 *retval = pc->pc_ucred->cr_ngroups; 235 return (0); 236 } else if (SCARG(uap, gidsetsize) < 0) 237 return (EINVAL); 238 ngrp = SCARG(uap, gidsetsize); 239 if (ngrp < pc->pc_ucred->cr_ngroups) 240 return (EINVAL); 241 ngrp = pc->pc_ucred->cr_ngroups; 242 error = copyout((caddr_t)pc->pc_ucred->cr_groups, 243 (caddr_t)SCARG(uap, gidset), ngrp * sizeof(gid_t)); 244 if (error) 245 return (error); 246 *retval = ngrp; 247 return (0); 248 } 249 250 /* ARGSUSED */ 251 int 252 sys_setsid(struct lwp *l, void *v, register_t *retval) 253 { 254 struct proc *p = l->l_proc; 255 256 if (p->p_pgid == p->p_pid || pgfind(p->p_pid)) { 257 return (EPERM); 258 } else { 259 (void)enterpgrp(p, p->p_pid, 1); 260 *retval = p->p_pid; 261 return (0); 262 } 263 } 264 265 /* 266 * set process group (setpgid/old setpgrp) 267 * 268 * caller does setpgid(targpid, targpgid) 269 * 270 * pgid must be in valid range (EINVAL) 271 * pid must be caller or child of caller (ESRCH) 272 * if a child 273 * pid must be in same session (EPERM) 274 * pid can't have done an exec (EACCES) 275 * if pgid != pid 276 * there must exist some pid in same session having pgid (EPERM) 277 * pid must not be session leader (EPERM) 278 */ 279 /* ARGSUSED */ 280 int 281 sys_setpgid(struct lwp *l, void *v, register_t *retval) 282 { 283 struct sys_setpgid_args /* { 284 syscallarg(int) pid; 285 syscallarg(int) pgid; 286 } */ *uap = v; 287 struct proc *curp = l->l_proc; 288 struct proc *targp; /* target process */ 289 struct pgrp *pgrp; /* target pgrp */ 290 291 if (SCARG(uap, pgid) < 0) 292 return (EINVAL); 293 294 if (SCARG(uap, pid) != 0 && SCARG(uap, pid) != curp->p_pid) { 295 if ((targp = pfind(SCARG(uap, pid))) == 0 || 296 !inferior(targp, curp)) 297 return (ESRCH); 298 if (targp->p_session != curp->p_session) 299 return (EPERM); 300 if (targp->p_flag & P_EXEC) 301 return (EACCES); 302 } else 303 targp = curp; 304 if (SESS_LEADER(targp)) 305 return (EPERM); 306 if (SCARG(uap, pgid) == 0) 307 SCARG(uap, pgid) = targp->p_pid; 308 else if (SCARG(uap, pgid) != targp->p_pid) 309 if ((pgrp = pgfind(SCARG(uap, pgid))) == 0 || 310 pgrp->pg_session != curp->p_session) 311 return (EPERM); 312 return (enterpgrp(targp, SCARG(uap, pgid), 0)); 313 } 314 315 /* 316 * Set real, effective and saved uids to the requested values. 317 * non-root callers can only ever change uids to values that match 318 * one of the processes current uid values. 319 * This is further restricted by the flags argument. 320 */ 321 322 int 323 do_setresuid(struct lwp *l, uid_t r, uid_t e, uid_t sv, u_int flags) 324 { 325 int error; 326 struct proc *p = l->l_proc; 327 struct pcred *pcred = p->p_cred; 328 struct ucred *cred = pcred->pc_ucred; 329 330 /* Superuser can do anything it wants to.... */ 331 error = suser(cred, &p->p_acflag); 332 if (error) { 333 /* Otherwise check new value is one of the allowed 334 existing values. */ 335 if (r != -1 && !((flags & ID_R_EQ_R) && r == pcred->p_ruid) 336 && !((flags & ID_R_EQ_E) && r == cred->cr_uid) 337 && !((flags & ID_R_EQ_S) && r == pcred->p_svuid)) 338 return error; 339 if (e != -1 && !((flags & ID_E_EQ_R) && e == pcred->p_ruid) 340 && !((flags & ID_E_EQ_E) && e == cred->cr_uid) 341 && !((flags & ID_E_EQ_S) && e == pcred->p_svuid)) 342 return error; 343 if (sv != -1 && !((flags & ID_S_EQ_R) && sv == pcred->p_ruid) 344 && !((flags & ID_S_EQ_E) && sv == cred->cr_uid) 345 && !((flags & ID_S_EQ_S) && sv == pcred->p_svuid)) 346 return error; 347 } 348 349 /* If nothing has changed, short circuit the request */ 350 if ((r == -1 || r == pcred->p_ruid) 351 && (e == -1 || e == cred->cr_uid) 352 && (sv == -1 || sv == pcred->p_svuid)) 353 /* nothing to do */ 354 return 0; 355 356 /* The pcred structure is not actually shared... */ 357 if (r != -1 && r != pcred->p_ruid) { 358 /* Update count of processes for this user */ 359 (void)chgproccnt(pcred->p_ruid, -1); 360 (void)chgproccnt(r, 1); 361 pcred->p_ruid = r; 362 } 363 if (sv != -1) 364 pcred->p_svuid = sv; 365 if (e != -1 && e != cred->cr_uid) { 366 /* Update a clone of the current credentials */ 367 pcred->pc_ucred = cred = crcopy(cred); 368 cred->cr_uid = e; 369 } 370 371 /* Mark process as having changed credentials, stops tracing etc */ 372 p_sugid(p); 373 return 0; 374 } 375 376 /* 377 * Set real, effective and saved gids to the requested values. 378 * non-root callers can only ever change gids to values that match 379 * one of the processes current gid values. 380 * This is further restricted by the flags argument. 381 */ 382 383 int 384 do_setresgid(struct lwp *l, gid_t r, gid_t e, gid_t sv, u_int flags) 385 { 386 int error; 387 struct proc *p = l->l_proc; 388 struct pcred *pcred = p->p_cred; 389 struct ucred *cred = pcred->pc_ucred; 390 391 /* Superuser can do anything it wants to.... */ 392 error = suser(cred, &p->p_acflag); 393 if (error) { 394 /* Otherwise check new value is one of the allowed 395 existing values. */ 396 if (r != -1 && !((flags & ID_R_EQ_R) && r == pcred->p_rgid) 397 && !((flags & ID_R_EQ_E) && r == cred->cr_gid) 398 && !((flags & ID_R_EQ_S) && r == pcred->p_svgid)) 399 return error; 400 if (e != -1 && !((flags & ID_E_EQ_R) && e == pcred->p_rgid) 401 && !((flags & ID_E_EQ_E) && e == cred->cr_gid) 402 && !((flags & ID_E_EQ_S) && e == pcred->p_svgid)) 403 return error; 404 if (sv != -1 && !((flags & ID_S_EQ_R) && sv == pcred->p_rgid) 405 && !((flags & ID_S_EQ_E) && sv == cred->cr_gid) 406 && !((flags & ID_S_EQ_S) && sv == pcred->p_svgid)) 407 return error; 408 } 409 410 /* If nothing has changed, short circuit the request */ 411 if ((r == -1 || r == pcred->p_rgid) 412 && (e == -1 || e == cred->cr_gid) 413 && (sv == -1 || sv == pcred->p_svgid)) 414 /* nothing to do */ 415 return 0; 416 417 /* The pcred structure is not actually shared... */ 418 if (r != -1) 419 pcred->p_rgid = r; 420 if (sv != -1) 421 pcred->p_svgid = sv; 422 if (e != -1 && e != cred->cr_gid) { 423 /* Update a clone of the current credentials */ 424 pcred->pc_ucred = cred = crcopy(cred); 425 cred->cr_gid = e; 426 } 427 428 /* Mark process as having changed credentials, stops tracing etc */ 429 p_sugid(p); 430 return 0; 431 } 432 433 /* ARGSUSED */ 434 int 435 sys_setuid(struct lwp *l, void *v, register_t *retval) 436 { 437 struct sys_setuid_args /* { 438 syscallarg(uid_t) uid; 439 } */ *uap = v; 440 uid_t uid = SCARG(uap, uid); 441 442 return do_setresuid(l, uid, uid, uid, 443 ID_R_EQ_R | ID_E_EQ_R | ID_S_EQ_R); 444 } 445 446 /* ARGSUSED */ 447 int 448 sys_seteuid(struct lwp *l, void *v, register_t *retval) 449 { 450 struct sys_seteuid_args /* { 451 syscallarg(uid_t) euid; 452 } */ *uap = v; 453 454 return do_setresuid(l, -1, SCARG(uap, euid), -1, ID_E_EQ_R | ID_E_EQ_S); 455 } 456 457 int 458 sys_setreuid(struct lwp *l, void *v, register_t *retval) 459 { 460 struct sys_setreuid_args /* { 461 syscallarg(uid_t) ruid; 462 syscallarg(uid_t) euid; 463 } */ *uap = v; 464 struct proc *p = l->l_proc; 465 uid_t ruid, euid, svuid; 466 467 ruid = SCARG(uap, ruid); 468 euid = SCARG(uap, euid); 469 if (ruid == -1) 470 ruid = p->p_cred->p_ruid; 471 if (euid == -1) 472 euid = p->p_ucred->cr_uid; 473 /* Saved uid is set to the new euid if the ruid changed */ 474 svuid = ruid == p->p_cred->p_ruid ? -1 : euid; 475 476 return do_setresuid(l, ruid, euid, svuid, 477 ID_R_EQ_R | ID_R_EQ_E | 478 ID_E_EQ_R | ID_E_EQ_E | ID_E_EQ_S | 479 ID_S_EQ_R | ID_S_EQ_E | ID_S_EQ_S); 480 } 481 482 /* ARGSUSED */ 483 int 484 sys_setgid(struct lwp *l, void *v, register_t *retval) 485 { 486 struct sys_setgid_args /* { 487 syscallarg(gid_t) gid; 488 } */ *uap = v; 489 gid_t gid = SCARG(uap, gid); 490 491 return do_setresgid(l, gid, gid, gid, 492 ID_R_EQ_R | ID_E_EQ_R | ID_S_EQ_R); 493 } 494 495 /* ARGSUSED */ 496 int 497 sys_setegid(struct lwp *l, void *v, register_t *retval) 498 { 499 struct sys_setegid_args /* { 500 syscallarg(gid_t) egid; 501 } */ *uap = v; 502 503 return do_setresgid(l, -1, SCARG(uap, egid), -1, ID_E_EQ_R | ID_E_EQ_S); 504 } 505 506 int 507 sys_setregid(struct lwp *l, void *v, register_t *retval) 508 { 509 struct sys_setregid_args /* { 510 syscallarg(gid_t) rgid; 511 syscallarg(gid_t) egid; 512 } */ *uap = v; 513 struct proc *p = l->l_proc; 514 gid_t rgid, egid, svgid; 515 516 rgid = SCARG(uap, rgid); 517 egid = SCARG(uap, egid); 518 if (rgid == -1) 519 rgid = p->p_cred->p_rgid; 520 if (egid == -1) 521 egid = p->p_ucred->cr_gid; 522 /* Saved gid is set to the new egid if the rgid changed */ 523 svgid = rgid == p->p_cred->p_rgid ? -1 : egid; 524 525 return do_setresgid(l, rgid, egid, svgid, 526 ID_R_EQ_R | ID_R_EQ_E | 527 ID_E_EQ_R | ID_E_EQ_E | ID_E_EQ_S | 528 ID_S_EQ_R | ID_S_EQ_E | ID_S_EQ_S); 529 } 530 531 int 532 sys_issetugid(struct lwp *l, void *v, register_t *retval) 533 { 534 struct proc *p = l->l_proc; 535 536 /* 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 { 613 614 if (cred->cr_uid == 0) { 615 if (acflag) 616 *acflag |= ASU; 617 return (0); 618 } 619 return (EPERM); 620 } 621 622 /* 623 * Allocate a zeroed cred structure. 624 */ 625 struct ucred * 626 crget(void) 627 { 628 struct ucred *cr; 629 630 MALLOC(cr, struct ucred *, sizeof(*cr), M_CRED, M_WAITOK); 631 memset((caddr_t)cr, 0, sizeof(*cr)); 632 cr->cr_ref = 1; 633 return (cr); 634 } 635 636 /* 637 * Free a cred structure. 638 * Throws away space when ref count gets to 0. 639 */ 640 void 641 crfree(struct ucred *cr) 642 { 643 644 if (--cr->cr_ref == 0) 645 FREE((caddr_t)cr, M_CRED); 646 } 647 648 /* 649 * Copy cred structure to a new one and free the old one. 650 */ 651 struct ucred * 652 crcopy(struct ucred *cr) 653 { 654 struct ucred *newcr; 655 656 if (cr->cr_ref == 1) 657 return (cr); 658 newcr = crget(); 659 *newcr = *cr; 660 crfree(cr); 661 newcr->cr_ref = 1; 662 return (newcr); 663 } 664 665 /* 666 * Dup cred struct to a new held one. 667 */ 668 struct ucred * 669 crdup(const struct ucred *cr) 670 { 671 struct ucred *newcr; 672 673 newcr = crget(); 674 *newcr = *cr; 675 newcr->cr_ref = 1; 676 return (newcr); 677 } 678 679 /* 680 * convert from userland credentials to kernel one 681 */ 682 void 683 crcvt(struct ucred *uc, const struct uucred *uuc) 684 { 685 686 uc->cr_ref = 0; 687 uc->cr_uid = uuc->cr_uid; 688 uc->cr_gid = uuc->cr_gid; 689 uc->cr_ngroups = uuc->cr_ngroups; 690 (void)memcpy(uc->cr_groups, uuc->cr_groups, sizeof(uuc->cr_groups)); 691 } 692 693 /* 694 * Get login name, if available. 695 */ 696 /* ARGSUSED */ 697 int 698 sys___getlogin(struct lwp *l, void *v, register_t *retval) 699 { 700 struct sys___getlogin_args /* { 701 syscallarg(char *) namebuf; 702 syscallarg(size_t) namelen; 703 } */ *uap = v; 704 struct proc *p = l->l_proc; 705 706 if (SCARG(uap, namelen) > sizeof(p->p_pgrp->pg_session->s_login)) 707 SCARG(uap, namelen) = sizeof(p->p_pgrp->pg_session->s_login); 708 return (copyout((caddr_t) p->p_pgrp->pg_session->s_login, 709 (caddr_t) SCARG(uap, namebuf), SCARG(uap, namelen))); 710 } 711 712 /* 713 * Set login name. 714 */ 715 /* ARGSUSED */ 716 int 717 sys___setlogin(struct lwp *l, void *v, register_t *retval) 718 { 719 struct sys___setlogin_args /* { 720 syscallarg(const char *) namebuf; 721 } */ *uap = v; 722 struct proc *p = l->l_proc; 723 struct session *s = p->p_pgrp->pg_session; 724 char newname[sizeof s->s_login + 1]; 725 int error; 726 727 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 728 return (error); 729 error = copyinstr(SCARG(uap, namebuf), &newname, sizeof newname, NULL); 730 if (error != 0) 731 return (error == ENAMETOOLONG ? EINVAL : error); 732 733 if (s->s_flags & S_LOGIN_SET && p->p_pid != s->s_sid && 734 strncmp(newname, s->s_login, sizeof s->s_login) != 0) 735 log(LOG_WARNING, "%s (pid %d) changing logname from " 736 "%.*s to %s\n", p->p_comm, p->p_pid, 737 (int)sizeof s->s_login, s->s_login, newname); 738 s->s_flags |= S_LOGIN_SET; 739 strncpy(s->s_login, newname, sizeof s->s_login); 740 return (0); 741 } 742
Indexes created Tue Sep 23 02:09:52 GMT 2025