1 /* $OpenBSD: kern_exec.c,v 1.54 2001/06/27 04:49:41 art Exp $ */ 2 /* $NetBSD: kern_exec.c,v 1.75 1996/02/09 18:59:28 christos Exp $ */ 3 4 /*- 5 * Copyright (C) 1993, 1994 Christopher G. Demetriou 6 * Copyright (C) 1992 Wolfgang Solfrank. 7 * Copyright (C) 1992 TooLs GmbH. 8 * All rights reserved. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by TooLs GmbH. 21 * 4. The name of TooLs GmbH may not be used to endorse or promote products 22 * derived from this software without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``AS IS'' AND ANY EXPRESS OR 25 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 26 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 27 * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 28 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 29 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; 30 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 31 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 32 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 33 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 34 */ 35 36 #include <sys/param.h> 37 #include <sys/systm.h> 38 #include <sys/filedesc.h> 39 #include <sys/kernel.h> 40 #include <sys/proc.h> 41 #include <sys/mount.h> 42 #include <sys/malloc.h> 43 #include <sys/namei.h> 44 #include <sys/vnode.h> 45 #include <sys/file.h> 46 #include <sys/acct.h> 47 #include <sys/exec.h> 48 #include <sys/ktrace.h> 49 #include <sys/resourcevar.h> 50 #include <sys/wait.h> 51 #include <sys/mman.h> 52 #include <sys/signalvar.h> 53 #include <sys/stat.h> 54 #include <sys/conf.h> 55 #ifdef SYSVSHM 56 #include <sys/shm.h> 57 #endif 58 59 #include <sys/syscallargs.h> 60 61 #include <vm/vm.h> 62 #include <vm/vm_kern.h> 63 64 #include <uvm/uvm_extern.h> 65 66 #include <machine/cpu.h> 67 #include <machine/reg.h> 68 69 /* 70 * check exec: 71 * given an "executable" described in the exec package's namei info, 72 * see what we can do with it. 73 * 74 * ON ENTRY: 75 * exec package with appropriate namei info 76 * proc pointer of exec'ing proc 77 * NO SELF-LOCKED VNODES 78 * 79 * ON EXIT: 80 * error: nothing held, etc. exec header still allocated. 81 * ok: filled exec package, one locked vnode. 82 * 83 * EXEC SWITCH ENTRY: 84 * Locked vnode to check, exec package, proc. 85 * 86 * EXEC SWITCH EXIT: 87 * ok: return 0, filled exec package, one locked vnode. 88 * error: destructive: 89 * everything deallocated execept exec header. 90 * non-descructive: 91 * error code, locked vnode, exec header unmodified 92 */ 93 int 94 check_exec(p, epp) 95 struct proc *p; 96 struct exec_package *epp; 97 { 98 int error, i; 99 struct vnode *vp; 100 struct nameidata *ndp; 101 size_t resid; 102 103 ndp = epp->ep_ndp; 104 ndp->ni_cnd.cn_nameiop = LOOKUP; 105 ndp->ni_cnd.cn_flags = FOLLOW | LOCKLEAF | SAVENAME; 106 /* first get the vnode */ 107 if ((error = namei(ndp)) != 0) 108 return (error); 109 epp->ep_vp = vp = ndp->ni_vp; 110 111 /* check for regular file */ 112 if (vp->v_type == VDIR) { 113 error = EISDIR; 114 goto bad1; 115 } 116 if (vp->v_type != VREG) { 117 error = EACCES; 118 goto bad1; 119 } 120 121 /* get attributes */ 122 if ((error = VOP_GETATTR(vp, epp->ep_vap, p->p_ucred, p)) != 0) 123 goto bad1; 124 125 /* Check mount point */ 126 if (vp->v_mount->mnt_flag & MNT_NOEXEC) { 127 error = EACCES; 128 goto bad1; 129 } 130 131 if ((vp->v_mount->mnt_flag & MNT_NOSUID)) 132 epp->ep_vap->va_mode &= ~(VSUID | VSGID); 133 134 /* check access. for root we have to see if any exec bit on */ 135 if ((error = VOP_ACCESS(vp, VEXEC, p->p_ucred, p)) != 0) 136 goto bad1; 137 if ((epp->ep_vap->va_mode & (S_IXUSR | S_IXGRP | S_IXOTH)) == 0) { 138 error = EACCES; 139 goto bad1; 140 } 141 142 /* try to open it */ 143 if ((error = VOP_OPEN(vp, FREAD, p->p_ucred, p)) != 0) 144 goto bad1; 145 146 /* now we have the file, get the exec header */ 147 error = vn_rdwr(UIO_READ, vp, epp->ep_hdr, epp->ep_hdrlen, 0, 148 UIO_SYSSPACE, IO_NODELOCKED, p->p_ucred, &resid, p); 149 if (error) 150 goto bad2; 151 epp->ep_hdrvalid = epp->ep_hdrlen - resid; 152 153 /* 154 * set up the vmcmds for creation of the process 155 * address space 156 */ 157 error = ENOEXEC; 158 for (i = 0; i < nexecs && error != 0; i++) { 159 int newerror; 160 161 if (execsw[i].es_check == NULL) 162 continue; 163 164 newerror = (*execsw[i].es_check)(p, epp); 165 /* make sure the first "interesting" error code is saved. */ 166 if (!newerror || error == ENOEXEC) 167 error = newerror; 168 if (epp->ep_flags & EXEC_DESTR && error != 0) 169 return (error); 170 } 171 if (!error) { 172 /* check that entry point is sane */ 173 if (epp->ep_entry > VM_MAXUSER_ADDRESS) { 174 error = ENOEXEC; 175 } 176 177 /* check limits */ 178 if ((epp->ep_tsize > MAXTSIZ) || 179 (epp->ep_dsize > p->p_rlimit[RLIMIT_DATA].rlim_cur)) 180 error = ENOMEM; 181 182 if (!error) 183 return (0); 184 } 185 186 /* 187 * free any vmspace-creation commands, 188 * and release their references 189 */ 190 kill_vmcmds(&epp->ep_vmcmds); 191 192 bad2: 193 /* 194 * unlock and close the vnode, free the 195 * pathname buf, and punt. 196 */ 197 VOP_UNLOCK(vp, 0, p); 198 vn_close(vp, FREAD, p->p_ucred, p); 199 FREE(ndp->ni_cnd.cn_pnbuf, M_NAMEI); 200 return (error); 201 202 bad1: 203 /* 204 * free the namei pathname buffer, and put the vnode 205 * (which we don't yet have open). 206 */ 207 FREE(ndp->ni_cnd.cn_pnbuf, M_NAMEI); 208 vput(vp); 209 return (error); 210 } 211 212 /* 213 * exec system call 214 */ 215 /* ARGSUSED */ 216 int 217 sys_execve(p, v, retval) 218 register struct proc *p; 219 void *v; 220 register_t *retval; 221 { 222 register struct sys_execve_args /* { 223 syscallarg(char *) path; 224 syscallarg(char * *) argp; 225 syscallarg(char * *) envp; 226 } */ *uap = v; 227 int error, i; 228 struct exec_package pack; 229 struct nameidata nid; 230 struct vattr attr; 231 struct ucred *cred = p->p_ucred; 232 char *argp; 233 char * const *cpp, *dp, *sp; 234 long argc, envc; 235 size_t len; 236 #ifdef MACHINE_STACK_GROWS_UP 237 size_t slen; 238 #endif 239 char *stack; 240 struct ps_strings arginfo; 241 struct vmspace *vm = p->p_vmspace; 242 char **tmpfap; 243 int szsigcode; 244 extern struct emul emul_native; 245 246 /* 247 * figure out the maximum size of an exec header, if necessary. 248 * XXX should be able to keep LKM code from modifying exec switch 249 * when we're still using it, but... 250 */ 251 if (exec_maxhdrsz == 0) { 252 for (i = 0; i < nexecs; i++) 253 if (execsw[i].es_check != NULL 254 && execsw[i].es_hdrsz > exec_maxhdrsz) 255 exec_maxhdrsz = execsw[i].es_hdrsz; 256 } 257 258 /* init the namei data to point the file user's program name */ 259 NDINIT(&nid, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 260 261 /* 262 * initialize the fields of the exec package. 263 */ 264 pack.ep_name = (char *)SCARG(uap, path); 265 pack.ep_hdr = malloc(exec_maxhdrsz, M_EXEC, M_WAITOK); 266 pack.ep_hdrlen = exec_maxhdrsz; 267 pack.ep_hdrvalid = 0; 268 pack.ep_ndp = &nid; 269 pack.ep_emul_arg = NULL; 270 VMCMDSET_INIT(&pack.ep_vmcmds); 271 pack.ep_vap = &attr; 272 pack.ep_emul = &emul_native; 273 pack.ep_flags = 0; 274 275 /* see if we can run it. */ 276 if ((error = check_exec(p, &pack)) != 0) { 277 goto freehdr; 278 } 279 280 /* XXX -- THE FOLLOWING SECTION NEEDS MAJOR CLEANUP */ 281 282 /* allocate an argument buffer */ 283 argp = (char *) uvm_km_valloc_wait(exec_map, NCARGS); 284 #ifdef DIAGNOSTIC 285 if (argp == (vaddr_t) 0) 286 panic("execve: argp == NULL"); 287 #endif 288 dp = argp; 289 argc = 0; 290 291 /* copy the fake args list, if there's one, freeing it as we go */ 292 if (pack.ep_flags & EXEC_HASARGL) { 293 tmpfap = pack.ep_fa; 294 while (*tmpfap != NULL) { 295 char *cp; 296 297 cp = *tmpfap; 298 while (*cp) 299 *dp++ = *cp++; 300 dp++; 301 302 free(*tmpfap, M_EXEC); 303 tmpfap++; argc++; 304 } 305 FREE(pack.ep_fa, M_EXEC); 306 pack.ep_flags &= ~EXEC_HASARGL; 307 } 308 309 /* Now get argv & environment */ 310 if (!(cpp = SCARG(uap, argp))) { 311 error = EINVAL; 312 goto bad; 313 } 314 315 if (pack.ep_flags & EXEC_SKIPARG) 316 cpp++; 317 318 while (1) { 319 len = argp + ARG_MAX - dp; 320 if ((error = copyin(cpp, &sp, sizeof(sp))) != 0) 321 goto bad; 322 if (!sp) 323 break; 324 if ((error = copyinstr(sp, dp, len, &len)) != 0) { 325 if (error == ENAMETOOLONG) 326 error = E2BIG; 327 goto bad; 328 } 329 dp += len; 330 cpp++; 331 argc++; 332 } 333 334 envc = 0; 335 /* environment need not be there */ 336 if ((cpp = SCARG(uap, envp)) != NULL ) { 337 while (1) { 338 len = argp + ARG_MAX - dp; 339 if ((error = copyin(cpp, &sp, sizeof(sp))) != 0) 340 goto bad; 341 if (!sp) 342 break; 343 if ((error = copyinstr(sp, dp, len, &len)) != 0) { 344 if (error == ENAMETOOLONG) 345 error = E2BIG; 346 goto bad; 347 } 348 dp += len; 349 cpp++; 350 envc++; 351 } 352 } 353 354 dp = (char *)ALIGN(dp); 355 356 szsigcode = pack.ep_emul->e_esigcode - pack.ep_emul->e_sigcode; 357 358 /* Now check if args & environ fit into new stack */ 359 len = ((argc + envc + 2 + pack.ep_emul->e_arglen) * sizeof(char *) + 360 sizeof(long) + dp + STACKGAPLEN + szsigcode + 361 sizeof(struct ps_strings)) - argp; 362 363 len = ALIGN(len); /* make the stack "safely" aligned */ 364 365 if (len > pack.ep_ssize) { /* in effect, compare to initial limit */ 366 error = ENOMEM; 367 goto bad; 368 } 369 370 /* adjust "active stack depth" for process VSZ */ 371 pack.ep_ssize = len; /* maybe should go elsewhere, but... */ 372 373 /* 374 * Prepare vmspace for remapping. Note that uvmspace_exec can replace 375 * p_vmspace! 376 */ 377 uvmspace_exec(p); 378 379 vm = p->p_vmspace; 380 /* Now map address space */ 381 vm->vm_taddr = (char *)pack.ep_taddr; 382 vm->vm_tsize = btoc(pack.ep_tsize); 383 vm->vm_daddr = (char *)pack.ep_daddr; 384 vm->vm_dsize = btoc(pack.ep_dsize); 385 vm->vm_ssize = btoc(pack.ep_ssize); 386 vm->vm_maxsaddr = (char *)pack.ep_maxsaddr; 387 388 /* create the new process's VM space by running the vmcmds */ 389 #ifdef DIAGNOSTIC 390 if (pack.ep_vmcmds.evs_used == 0) 391 panic("execve: no vmcmds"); 392 #endif 393 for (i = 0; i < pack.ep_vmcmds.evs_used && !error; i++) { 394 struct exec_vmcmd *vcp; 395 396 vcp = &pack.ep_vmcmds.evs_cmds[i]; 397 error = (*vcp->ev_proc)(p, vcp); 398 } 399 400 /* free the vmspace-creation commands, and release their references */ 401 kill_vmcmds(&pack.ep_vmcmds); 402 403 /* if an error happened, deallocate and punt */ 404 if (error) 405 goto exec_abort; 406 407 /* remember information about the process */ 408 arginfo.ps_nargvstr = argc; 409 arginfo.ps_nenvstr = envc; 410 411 #ifdef MACHINE_STACK_GROWS_UP 412 stack = (char *)USRSTACK + sizeof(arginfo) + szsigcode; 413 slen = len - sizeof(arginfo) - szsigcode; 414 #else 415 stack = (char *)(USRSTACK - len); 416 #endif 417 /* Now copy argc, args & environ to new stack */ 418 if (!(*pack.ep_emul->e_copyargs)(&pack, &arginfo, stack, argp)) 419 goto exec_abort; 420 421 /* copy out the process's ps_strings structure */ 422 if (copyout(&arginfo, (char *)PS_STRINGS, sizeof(arginfo))) 423 goto exec_abort; 424 425 /* copy out the process's signal trampoline code */ 426 #ifdef MACHINE_STACK_GROWS_UP 427 if (szsigcode && copyout((char *)pack.ep_emul->e_sigcode, 428 ((char *)PS_STRINGS) + sizeof(arginfo), szsigcode)) 429 goto exec_abort; 430 #else 431 if (szsigcode && copyout((char *)pack.ep_emul->e_sigcode, 432 ((char *)PS_STRINGS) - szsigcode, szsigcode)) 433 goto exec_abort; 434 #endif 435 436 stopprofclock(p); /* stop profiling */ 437 fdcloseexec(p); /* handle close on exec */ 438 execsigs(p); /* reset catched signals */ 439 440 /* set command name & other accounting info */ 441 len = min(nid.ni_cnd.cn_namelen, MAXCOMLEN); 442 bcopy(nid.ni_cnd.cn_nameptr, p->p_comm, len); 443 p->p_comm[len] = 0; 444 p->p_acflag &= ~AFORK; 445 446 /* record proc's vnode, for use by procfs and others */ 447 if (p->p_textvp) 448 vrele(p->p_textvp); 449 VREF(pack.ep_vp); 450 p->p_textvp = pack.ep_vp; 451 452 p->p_flag |= P_EXEC; 453 if (p->p_flag & P_PPWAIT) { 454 p->p_flag &= ~P_PPWAIT; 455 wakeup((caddr_t)p->p_pptr); 456 } 457 458 /* 459 * If process does execve() while it has euid/uid or egid/gid 460 * which are mismatched, it remains P_SUGIDEXEC. 461 */ 462 if (p->p_ucred->cr_uid == p->p_cred->p_ruid && 463 p->p_ucred->cr_gid == p->p_cred->p_rgid) 464 p->p_flag &= ~P_SUGIDEXEC; 465 466 /* 467 * deal with set[ug]id. 468 * MNT_NOEXEC has already been used to disable s[ug]id. 469 */ 470 if ((attr.va_mode & (VSUID | VSGID)) && proc_cansugid(p)) { 471 int i; 472 473 p->p_flag |= P_SUGID; 474 p->p_flag |= P_SUGIDEXEC; 475 476 #ifdef KTRACE 477 /* 478 * If process is being ktraced, turn off - unless 479 * root set it. 480 */ 481 if (p->p_tracep && !(p->p_traceflag & KTRFAC_ROOT)) { 482 p->p_traceflag = 0; 483 ktrsettracevnode(p, NULL); 484 } 485 #endif 486 p->p_ucred = crcopy(cred); 487 if (attr.va_mode & VSUID) 488 p->p_ucred->cr_uid = attr.va_uid; 489 if (attr.va_mode & VSGID) 490 p->p_ucred->cr_gid = attr.va_gid; 491 492 /* 493 * For set[ug]id processes, a few caveats apply to 494 * stdin, stdout, and stderr. 495 */ 496 for (i = 0; i < 3; i++) { 497 struct file *fp = NULL; 498 499 if (i < p->p_fd->fd_nfiles) 500 fp = p->p_fd->fd_ofiles[i]; 501 502 #ifdef PROCFS 503 /* 504 * Close descriptors that are writing to procfs. 505 */ 506 if (fp && fp->f_type == DTYPE_VNODE && 507 ((struct vnode *)(fp->f_data))->v_tag == VT_PROCFS && 508 (fp->f_flag & FWRITE)) { 509 fdrelease(p, i); 510 fp = NULL; 511 } 512 #endif 513 514 /* 515 * Ensure that stdin, stdout, and stderr are already 516 * allocated. We do not want userland to accidentally 517 * allocate descriptors in this range which has implied 518 * meaning to libc. 519 * 520 * XXX - Shouldn't the exec fail if we can't allocate 521 * resources here? 522 */ 523 if (fp == NULL) { 524 short flags = FREAD | (i == 0 ? 0 : FWRITE); 525 struct vnode *vp; 526 int indx; 527 528 if ((error = falloc(p, &fp, &indx)) != 0) 529 break; 530 #ifdef DIAGNOSTIC 531 if (indx != i) 532 panic("sys_execve: falloc indx != i"); 533 #endif 534 if ((error = cdevvp(getnulldev(), &vp)) != 0) { 535 ffree(fp); 536 fdremove(p->p_fd, indx); 537 break; 538 } 539 if ((error = VOP_OPEN(vp, flags, p->p_ucred, p)) != 0) { 540 ffree(fp); 541 fdremove(p->p_fd, indx); 542 vrele(vp); 543 break; 544 } 545 if (flags & FWRITE) 546 vp->v_writecount++; 547 fp->f_flag = flags; 548 fp->f_type = DTYPE_VNODE; 549 fp->f_ops = &vnops; 550 fp->f_data = (caddr_t)vp; 551 } 552 } 553 } else 554 p->p_flag &= ~P_SUGID; 555 p->p_cred->p_svuid = p->p_ucred->cr_uid; 556 p->p_cred->p_svgid = p->p_ucred->cr_gid; 557 558 if (p->p_flag & P_SUGIDEXEC) { 559 int i, s = splclock(); 560 561 timeout_del(&p->p_realit_to); 562 timerclear(&p->p_realtimer.it_interval); 563 timerclear(&p->p_realtimer.it_value); 564 for (i = 0; i < sizeof(p->p_stats->p_timer) / 565 sizeof(p->p_stats->p_timer[0]); i++) { 566 timerclear(&p->p_stats->p_timer[i].it_interval); 567 timerclear(&p->p_stats->p_timer[i].it_value); 568 } 569 splx(s); 570 } 571 572 uvm_km_free_wakeup(exec_map, (vaddr_t) argp, NCARGS); 573 574 FREE(nid.ni_cnd.cn_pnbuf, M_NAMEI); 575 VOP_CLOSE(pack.ep_vp, FREAD, cred, p); 576 vput(pack.ep_vp); 577 578 /* 579 * notify others that we exec'd 580 */ 581 KNOTE(&p->p_klist, NOTE_EXEC); 582 583 /* setup new registers and do misc. setup. */ 584 if (pack.ep_emul->e_fixup != NULL) { 585 if ((*pack.ep_emul->e_fixup)(p, &pack) != 0) 586 goto free_pack_abort; 587 } 588 #ifdef MACHINE_STACK_GROWS_UP 589 (*pack.ep_emul->e_setregs)(p, &pack, (u_long)stack + slen, retval); 590 #else 591 (*pack.ep_emul->e_setregs)(p, &pack, (u_long)stack, retval); 592 #endif 593 594 if (p->p_flag & P_TRACED) 595 psignal(p, SIGTRAP); 596 597 p->p_emul = pack.ep_emul; 598 free(pack.ep_hdr, M_EXEC); 599 600 #ifdef KTRACE 601 if (KTRPOINT(p, KTR_EMUL)) 602 ktremul(p, p->p_emul->e_name); 603 #endif 604 return (0); 605 606 bad: 607 /* free the vmspace-creation commands, and release their references */ 608 kill_vmcmds(&pack.ep_vmcmds); 609 /* kill any opened file descriptor, if necessary */ 610 if (pack.ep_flags & EXEC_HASFD) { 611 pack.ep_flags &= ~EXEC_HASFD; 612 (void) fdrelease(p, pack.ep_fd); 613 } 614 /* close and put the exec'd file */ 615 VOP_CLOSE(pack.ep_vp, FREAD, cred, p); 616 vput(pack.ep_vp); 617 FREE(nid.ni_cnd.cn_pnbuf, M_NAMEI); 618 uvm_km_free_wakeup(exec_map, (vaddr_t) argp, NCARGS); 619 620 freehdr: 621 free(pack.ep_hdr, M_EXEC); 622 return (error); 623 624 exec_abort: 625 /* 626 * the old process doesn't exist anymore. exit gracefully. 627 * get rid of the (new) address space we have created, if any, get rid 628 * of our namei data and vnode, and exit noting failure 629 */ 630 uvm_deallocate(&vm->vm_map, VM_MIN_ADDRESS, 631 VM_MAXUSER_ADDRESS - VM_MIN_ADDRESS); 632 if (pack.ep_emul_arg) 633 FREE(pack.ep_emul_arg, M_TEMP); 634 FREE(nid.ni_cnd.cn_pnbuf, M_NAMEI); 635 VOP_CLOSE(pack.ep_vp, FREAD, cred, p); 636 vput(pack.ep_vp); 637 uvm_km_free_wakeup(exec_map, (vaddr_t) argp, NCARGS); 638 639 free_pack_abort: 640 free(pack.ep_hdr, M_EXEC); 641 exit1(p, W_EXITCODE(0, SIGABRT)); 642 exit1(p, -1); 643 644 /* NOTREACHED */ 645 return (0); 646 } 647 648 649 void * 650 copyargs(pack, arginfo, stack, argp) 651 struct exec_package *pack; 652 struct ps_strings *arginfo; 653 void *stack; 654 void *argp; 655 { 656 char **cpp = stack; 657 char *dp, *sp; 658 size_t len; 659 void *nullp = NULL; 660 int argc = arginfo->ps_nargvstr; 661 int envc = arginfo->ps_nenvstr; 662 663 if (copyout(&argc, cpp++, sizeof(argc))) 664 return (NULL); 665 666 dp = (char *) (cpp + argc + envc + 2 + pack->ep_emul->e_arglen); 667 sp = argp; 668 669 /* XXX don't copy them out, remap them! */ 670 arginfo->ps_argvstr = cpp; /* remember location of argv for later */ 671 672 for (; --argc >= 0; sp += len, dp += len) 673 if (copyout(&dp, cpp++, sizeof(dp)) || 674 copyoutstr(sp, dp, ARG_MAX, &len)) 675 return (NULL); 676 677 if (copyout(&nullp, cpp++, sizeof(nullp))) 678 return (NULL); 679 680 arginfo->ps_envstr = cpp; /* remember location of envp for later */ 681 682 for (; --envc >= 0; sp += len, dp += len) 683 if (copyout(&dp, cpp++, sizeof(dp)) || 684 copyoutstr(sp, dp, ARG_MAX, &len)) 685 return (NULL); 686 687 if (copyout(&nullp, cpp++, sizeof(nullp))) 688 return (NULL); 689 690 return (cpp); 691 } 692