1 /* $OpenBSD: kern_exec.c,v 1.65 2002/02/17 04:31:26 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 <uvm/uvm_extern.h> 62 63 #include <machine/cpu.h> 64 #include <machine/reg.h> 65 66 #include <dev/rndvar.h> 67 68 /* 69 * stackgap_random specifies if the stackgap should have a random size added 70 * to it. Must be a n^2. If non-zero, the stack gap will be calculated as: 71 * (arc4random() * ALIGNBYTES) & (stackgap_random - 1) + STACKGAPLEN. 72 */ 73 int stackgap_random = 1024; 74 75 /* 76 * check exec: 77 * given an "executable" described in the exec package's namei info, 78 * see what we can do with it. 79 * 80 * ON ENTRY: 81 * exec package with appropriate namei info 82 * proc pointer of exec'ing proc 83 * NO SELF-LOCKED VNODES 84 * 85 * ON EXIT: 86 * error: nothing held, etc. exec header still allocated. 87 * ok: filled exec package, one locked vnode. 88 * 89 * EXEC SWITCH ENTRY: 90 * Locked vnode to check, exec package, proc. 91 * 92 * EXEC SWITCH EXIT: 93 * ok: return 0, filled exec package, one locked vnode. 94 * error: destructive: 95 * everything deallocated execept exec header. 96 * non-descructive: 97 * error code, locked vnode, exec header unmodified 98 */ 99 int 100 check_exec(p, epp) 101 struct proc *p; 102 struct exec_package *epp; 103 { 104 int error, i; 105 struct vnode *vp; 106 struct nameidata *ndp; 107 size_t resid; 108 109 ndp = epp->ep_ndp; 110 ndp->ni_cnd.cn_nameiop = LOOKUP; 111 ndp->ni_cnd.cn_flags = FOLLOW | LOCKLEAF | SAVENAME; 112 /* first get the vnode */ 113 if ((error = namei(ndp)) != 0) 114 return (error); 115 epp->ep_vp = vp = ndp->ni_vp; 116 117 /* check for regular file */ 118 if (vp->v_type == VDIR) { 119 error = EISDIR; 120 goto bad1; 121 } 122 if (vp->v_type != VREG) { 123 error = EACCES; 124 goto bad1; 125 } 126 127 /* get attributes */ 128 if ((error = VOP_GETATTR(vp, epp->ep_vap, p->p_ucred, p)) != 0) 129 goto bad1; 130 131 /* Check mount point */ 132 if (vp->v_mount->mnt_flag & MNT_NOEXEC) { 133 error = EACCES; 134 goto bad1; 135 } 136 137 if ((vp->v_mount->mnt_flag & MNT_NOSUID)) 138 epp->ep_vap->va_mode &= ~(VSUID | VSGID); 139 140 /* check access. for root we have to see if any exec bit on */ 141 if ((error = VOP_ACCESS(vp, VEXEC, p->p_ucred, p)) != 0) 142 goto bad1; 143 if ((epp->ep_vap->va_mode & (S_IXUSR | S_IXGRP | S_IXOTH)) == 0) { 144 error = EACCES; 145 goto bad1; 146 } 147 148 /* try to open it */ 149 if ((error = VOP_OPEN(vp, FREAD, p->p_ucred, p)) != 0) 150 goto bad1; 151 152 /* now we have the file, get the exec header */ 153 error = vn_rdwr(UIO_READ, vp, epp->ep_hdr, epp->ep_hdrlen, 0, 154 UIO_SYSSPACE, IO_NODELOCKED, p->p_ucred, &resid, p); 155 if (error) 156 goto bad2; 157 epp->ep_hdrvalid = epp->ep_hdrlen - resid; 158 159 /* 160 * set up the vmcmds for creation of the process 161 * address space 162 */ 163 error = ENOEXEC; 164 for (i = 0; i < nexecs && error != 0; i++) { 165 int newerror; 166 167 if (execsw[i].es_check == NULL) 168 continue; 169 170 newerror = (*execsw[i].es_check)(p, epp); 171 /* make sure the first "interesting" error code is saved. */ 172 if (!newerror || error == ENOEXEC) 173 error = newerror; 174 if (epp->ep_flags & EXEC_DESTR && error != 0) 175 return (error); 176 } 177 if (!error) { 178 /* check that entry point is sane */ 179 if (epp->ep_entry > VM_MAXUSER_ADDRESS) { 180 error = ENOEXEC; 181 } 182 183 /* check limits */ 184 if ((epp->ep_tsize > MAXTSIZ) || 185 (epp->ep_dsize > p->p_rlimit[RLIMIT_DATA].rlim_cur)) 186 error = ENOMEM; 187 188 if (!error) 189 return (0); 190 } 191 192 /* 193 * free any vmspace-creation commands, 194 * and release their references 195 */ 196 kill_vmcmds(&epp->ep_vmcmds); 197 198 bad2: 199 /* 200 * unlock and close the vnode, free the 201 * pathname buf, and punt. 202 */ 203 VOP_UNLOCK(vp, 0, p); 204 vn_close(vp, FREAD, p->p_ucred, p); 205 FREE(ndp->ni_cnd.cn_pnbuf, M_NAMEI); 206 return (error); 207 208 bad1: 209 /* 210 * free the namei pathname buffer, and put the vnode 211 * (which we don't yet have open). 212 */ 213 FREE(ndp->ni_cnd.cn_pnbuf, M_NAMEI); 214 vput(vp); 215 return (error); 216 } 217 218 /* 219 * exec system call 220 */ 221 /* ARGSUSED */ 222 int 223 sys_execve(p, v, retval) 224 register struct proc *p; 225 void *v; 226 register_t *retval; 227 { 228 struct sys_execve_args /* { 229 syscallarg(char *) path; 230 syscallarg(char * *) argp; 231 syscallarg(char * *) envp; 232 } */ *uap = v; 233 int error, i; 234 struct exec_package pack; 235 struct nameidata nid; 236 struct vattr attr; 237 struct ucred *cred = p->p_ucred; 238 char *argp; 239 char * const *cpp, *dp, *sp; 240 long argc, envc; 241 size_t len, sgap; 242 #ifdef MACHINE_STACK_GROWS_UP 243 size_t slen; 244 #endif 245 char *stack; 246 struct ps_strings arginfo; 247 struct vmspace *vm = p->p_vmspace; 248 char **tmpfap; 249 int szsigcode; 250 extern struct emul emul_native; 251 252 /* 253 * Cheap solution to complicated problems. 254 * Mark this process as "leave me alone, I'm execing". 255 */ 256 p->p_flag |= P_INEXEC; 257 258 /* 259 * figure out the maximum size of an exec header, if necessary. 260 * XXX should be able to keep LKM code from modifying exec switch 261 * when we're still using it, but... 262 */ 263 if (exec_maxhdrsz == 0) { 264 for (i = 0; i < nexecs; i++) 265 if (execsw[i].es_check != NULL 266 && execsw[i].es_hdrsz > exec_maxhdrsz) 267 exec_maxhdrsz = execsw[i].es_hdrsz; 268 } 269 270 /* init the namei data to point the file user's program name */ 271 NDINIT(&nid, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 272 273 /* 274 * initialize the fields of the exec package. 275 */ 276 pack.ep_name = (char *)SCARG(uap, path); 277 pack.ep_hdr = malloc(exec_maxhdrsz, M_EXEC, M_WAITOK); 278 pack.ep_hdrlen = exec_maxhdrsz; 279 pack.ep_hdrvalid = 0; 280 pack.ep_ndp = &nid; 281 pack.ep_emul_arg = NULL; 282 VMCMDSET_INIT(&pack.ep_vmcmds); 283 pack.ep_vap = &attr; 284 pack.ep_emul = &emul_native; 285 pack.ep_flags = 0; 286 287 /* see if we can run it. */ 288 if ((error = check_exec(p, &pack)) != 0) { 289 goto freehdr; 290 } 291 292 /* XXX -- THE FOLLOWING SECTION NEEDS MAJOR CLEANUP */ 293 294 /* allocate an argument buffer */ 295 argp = (char *) uvm_km_valloc_wait(exec_map, NCARGS); 296 #ifdef DIAGNOSTIC 297 if (argp == (vaddr_t) 0) 298 panic("execve: argp == NULL"); 299 #endif 300 dp = argp; 301 argc = 0; 302 303 /* copy the fake args list, if there's one, freeing it as we go */ 304 if (pack.ep_flags & EXEC_HASARGL) { 305 tmpfap = pack.ep_fa; 306 while (*tmpfap != NULL) { 307 char *cp; 308 309 cp = *tmpfap; 310 while (*cp) 311 *dp++ = *cp++; 312 dp++; 313 314 free(*tmpfap, M_EXEC); 315 tmpfap++; argc++; 316 } 317 FREE(pack.ep_fa, M_EXEC); 318 pack.ep_flags &= ~EXEC_HASARGL; 319 } 320 321 /* Now get argv & environment */ 322 if (!(cpp = SCARG(uap, argp))) { 323 error = EINVAL; 324 goto bad; 325 } 326 327 if (pack.ep_flags & EXEC_SKIPARG) 328 cpp++; 329 330 while (1) { 331 len = argp + ARG_MAX - dp; 332 if ((error = copyin(cpp, &sp, sizeof(sp))) != 0) 333 goto bad; 334 if (!sp) 335 break; 336 if ((error = copyinstr(sp, dp, len, &len)) != 0) { 337 if (error == ENAMETOOLONG) 338 error = E2BIG; 339 goto bad; 340 } 341 dp += len; 342 cpp++; 343 argc++; 344 } 345 346 envc = 0; 347 /* environment need not be there */ 348 if ((cpp = SCARG(uap, envp)) != NULL ) { 349 while (1) { 350 len = argp + ARG_MAX - dp; 351 if ((error = copyin(cpp, &sp, sizeof(sp))) != 0) 352 goto bad; 353 if (!sp) 354 break; 355 if ((error = copyinstr(sp, dp, len, &len)) != 0) { 356 if (error == ENAMETOOLONG) 357 error = E2BIG; 358 goto bad; 359 } 360 dp += len; 361 cpp++; 362 envc++; 363 } 364 } 365 366 dp = (char *)ALIGN(dp); 367 368 szsigcode = pack.ep_emul->e_esigcode - pack.ep_emul->e_sigcode; 369 370 sgap = STACKGAPLEN; 371 if (stackgap_random != 0) 372 sgap += (arc4random() * ALIGNBYTES) & (stackgap_random - 1); 373 /* Now check if args & environ fit into new stack */ 374 len = ((argc + envc + 2 + pack.ep_emul->e_arglen) * sizeof(char *) + 375 sizeof(long) + dp + sgap + szsigcode + 376 sizeof(struct ps_strings)) - argp; 377 378 len = ALIGN(len); /* make the stack "safely" aligned */ 379 380 if (len > pack.ep_ssize) { /* in effect, compare to initial limit */ 381 error = ENOMEM; 382 goto bad; 383 } 384 385 /* adjust "active stack depth" for process VSZ */ 386 pack.ep_ssize = len; /* maybe should go elsewhere, but... */ 387 388 /* 389 * Prepare vmspace for remapping. Note that uvmspace_exec can replace 390 * p_vmspace! 391 */ 392 uvmspace_exec(p, VM_MIN_ADDRESS, VM_MAXUSER_ADDRESS); 393 394 vm = p->p_vmspace; 395 /* Now map address space */ 396 vm->vm_taddr = (char *)pack.ep_taddr; 397 vm->vm_tsize = btoc(pack.ep_tsize); 398 vm->vm_daddr = (char *)pack.ep_daddr; 399 vm->vm_dsize = btoc(pack.ep_dsize); 400 vm->vm_ssize = btoc(pack.ep_ssize); 401 vm->vm_maxsaddr = (char *)pack.ep_maxsaddr; 402 403 /* create the new process's VM space by running the vmcmds */ 404 #ifdef DIAGNOSTIC 405 if (pack.ep_vmcmds.evs_used == 0) 406 panic("execve: no vmcmds"); 407 #endif 408 for (i = 0; i < pack.ep_vmcmds.evs_used && !error; i++) { 409 struct exec_vmcmd *vcp; 410 411 vcp = &pack.ep_vmcmds.evs_cmds[i]; 412 error = (*vcp->ev_proc)(p, vcp); 413 } 414 415 /* free the vmspace-creation commands, and release their references */ 416 kill_vmcmds(&pack.ep_vmcmds); 417 418 /* if an error happened, deallocate and punt */ 419 if (error) 420 goto exec_abort; 421 422 /* remember information about the process */ 423 arginfo.ps_nargvstr = argc; 424 arginfo.ps_nenvstr = envc; 425 426 #ifdef MACHINE_STACK_GROWS_UP 427 stack = (char *)USRSTACK + sizeof(arginfo) + szsigcode; 428 slen = len - sizeof(arginfo) - szsigcode; 429 #else 430 stack = (char *)(USRSTACK - len); 431 #endif 432 /* Now copy argc, args & environ to new stack */ 433 if (!(*pack.ep_emul->e_copyargs)(&pack, &arginfo, stack, argp)) 434 goto exec_abort; 435 436 /* copy out the process's ps_strings structure */ 437 if (copyout(&arginfo, (char *)PS_STRINGS, sizeof(arginfo))) 438 goto exec_abort; 439 440 /* copy out the process's signal trampoline code */ 441 #ifdef MACHINE_STACK_GROWS_UP 442 if (szsigcode && copyout((char *)pack.ep_emul->e_sigcode, 443 ((char *)PS_STRINGS) + sizeof(arginfo), szsigcode)) 444 goto exec_abort; 445 #else 446 if (szsigcode && copyout((char *)pack.ep_emul->e_sigcode, 447 ((char *)PS_STRINGS) - szsigcode, szsigcode)) 448 goto exec_abort; 449 #endif 450 451 stopprofclock(p); /* stop profiling */ 452 fdcloseexec(p); /* handle close on exec */ 453 execsigs(p); /* reset catched signals */ 454 455 /* set command name & other accounting info */ 456 len = min(nid.ni_cnd.cn_namelen, MAXCOMLEN); 457 bcopy(nid.ni_cnd.cn_nameptr, p->p_comm, len); 458 p->p_comm[len] = 0; 459 p->p_acflag &= ~AFORK; 460 461 /* record proc's vnode, for use by procfs and others */ 462 if (p->p_textvp) 463 vrele(p->p_textvp); 464 VREF(pack.ep_vp); 465 p->p_textvp = pack.ep_vp; 466 467 p->p_flag |= P_EXEC; 468 if (p->p_flag & P_PPWAIT) { 469 p->p_flag &= ~P_PPWAIT; 470 wakeup((caddr_t)p->p_pptr); 471 } 472 473 /* 474 * If process does execve() while it has euid/uid or egid/gid 475 * which are mismatched, it remains P_SUGIDEXEC. 476 */ 477 if (p->p_ucred->cr_uid == p->p_cred->p_ruid && 478 p->p_ucred->cr_gid == p->p_cred->p_rgid) 479 p->p_flag &= ~P_SUGIDEXEC; 480 481 /* 482 * deal with set[ug]id. 483 * MNT_NOEXEC has already been used to disable s[ug]id. 484 */ 485 if ((attr.va_mode & (VSUID | VSGID)) && proc_cansugid(p)) { 486 int i; 487 488 p->p_flag |= P_SUGID; 489 p->p_flag |= P_SUGIDEXEC; 490 491 #ifdef KTRACE 492 /* 493 * If process is being ktraced, turn off - unless 494 * root set it. 495 */ 496 if (p->p_tracep && !(p->p_traceflag & KTRFAC_ROOT)) { 497 p->p_traceflag = 0; 498 ktrsettracevnode(p, NULL); 499 } 500 #endif 501 p->p_ucred = crcopy(cred); 502 if (attr.va_mode & VSUID) 503 p->p_ucred->cr_uid = attr.va_uid; 504 if (attr.va_mode & VSGID) 505 p->p_ucred->cr_gid = attr.va_gid; 506 507 /* 508 * For set[ug]id processes, a few caveats apply to 509 * stdin, stdout, and stderr. 510 */ 511 for (i = 0; i < 3; i++) { 512 struct file *fp = NULL; 513 514 /* 515 * NOTE - This will never return NULL because of 516 * unmature fds. The file descriptor table is not 517 * shared because we're suid. 518 */ 519 fp = fd_getfile(p->p_fd, i); 520 #ifdef PROCFS 521 /* 522 * Close descriptors that are writing to procfs. 523 */ 524 if (fp && fp->f_type == DTYPE_VNODE && 525 ((struct vnode *)(fp->f_data))->v_tag == VT_PROCFS && 526 (fp->f_flag & FWRITE)) { 527 fdrelease(p, i); 528 fp = NULL; 529 } 530 #endif 531 532 /* 533 * Ensure that stdin, stdout, and stderr are already 534 * allocated. We do not want userland to accidentally 535 * allocate descriptors in this range which has implied 536 * meaning to libc. 537 * 538 * XXX - Shouldn't the exec fail if we can't allocate 539 * resources here? 540 */ 541 if (fp == NULL) { 542 short flags = FREAD | (i == 0 ? 0 : FWRITE); 543 struct vnode *vp; 544 int indx; 545 546 if ((error = falloc(p, &fp, &indx)) != 0) 547 break; 548 #ifdef DIAGNOSTIC 549 if (indx != i) 550 panic("sys_execve: falloc indx != i"); 551 #endif 552 if ((error = cdevvp(getnulldev(), &vp)) != 0) { 553 fdremove(p->p_fd, indx); 554 closef(fp, p); 555 break; 556 } 557 if ((error = VOP_OPEN(vp, flags, p->p_ucred, p)) != 0) { 558 fdremove(p->p_fd, indx); 559 closef(fp, p); 560 vrele(vp); 561 break; 562 } 563 if (flags & FWRITE) 564 vp->v_writecount++; 565 fp->f_flag = flags; 566 fp->f_type = DTYPE_VNODE; 567 fp->f_ops = &vnops; 568 fp->f_data = (caddr_t)vp; 569 FILE_SET_MATURE(fp); 570 } 571 } 572 } else 573 p->p_flag &= ~P_SUGID; 574 p->p_cred->p_svuid = p->p_ucred->cr_uid; 575 p->p_cred->p_svgid = p->p_ucred->cr_gid; 576 577 if (p->p_flag & P_SUGIDEXEC) { 578 int i, s = splclock(); 579 580 timeout_del(&p->p_realit_to); 581 timerclear(&p->p_realtimer.it_interval); 582 timerclear(&p->p_realtimer.it_value); 583 for (i = 0; i < sizeof(p->p_stats->p_timer) / 584 sizeof(p->p_stats->p_timer[0]); i++) { 585 timerclear(&p->p_stats->p_timer[i].it_interval); 586 timerclear(&p->p_stats->p_timer[i].it_value); 587 } 588 splx(s); 589 } 590 591 uvm_km_free_wakeup(exec_map, (vaddr_t) argp, NCARGS); 592 593 FREE(nid.ni_cnd.cn_pnbuf, M_NAMEI); 594 VOP_CLOSE(pack.ep_vp, FREAD, cred, p); 595 vput(pack.ep_vp); 596 597 /* 598 * notify others that we exec'd 599 */ 600 KNOTE(&p->p_klist, NOTE_EXEC); 601 602 /* setup new registers and do misc. setup. */ 603 if (pack.ep_emul->e_fixup != NULL) { 604 if ((*pack.ep_emul->e_fixup)(p, &pack) != 0) 605 goto free_pack_abort; 606 } 607 #ifdef MACHINE_STACK_GROWS_UP 608 (*pack.ep_emul->e_setregs)(p, &pack, (u_long)stack + slen, retval); 609 #else 610 (*pack.ep_emul->e_setregs)(p, &pack, (u_long)stack, retval); 611 #endif 612 613 if (p->p_flag & P_TRACED) 614 psignal(p, SIGTRAP); 615 616 p->p_emul = pack.ep_emul; 617 free(pack.ep_hdr, M_EXEC); 618 619 #ifdef KTRACE 620 if (KTRPOINT(p, KTR_EMUL)) 621 ktremul(p, p->p_emul->e_name); 622 #endif 623 p->p_flag &= ~P_INEXEC; 624 return (0); 625 626 bad: 627 /* free the vmspace-creation commands, and release their references */ 628 kill_vmcmds(&pack.ep_vmcmds); 629 /* kill any opened file descriptor, if necessary */ 630 if (pack.ep_flags & EXEC_HASFD) { 631 pack.ep_flags &= ~EXEC_HASFD; 632 (void) fdrelease(p, pack.ep_fd); 633 } 634 /* close and put the exec'd file */ 635 VOP_CLOSE(pack.ep_vp, FREAD, cred, p); 636 vput(pack.ep_vp); 637 FREE(nid.ni_cnd.cn_pnbuf, M_NAMEI); 638 uvm_km_free_wakeup(exec_map, (vaddr_t) argp, NCARGS); 639 640 freehdr: 641 free(pack.ep_hdr, M_EXEC); 642 p->p_flag &= ~P_INEXEC; 643 return (error); 644 645 exec_abort: 646 /* 647 * the old process doesn't exist anymore. exit gracefully. 648 * get rid of the (new) address space we have created, if any, get rid 649 * of our namei data and vnode, and exit noting failure 650 */ 651 uvm_deallocate(&vm->vm_map, VM_MIN_ADDRESS, 652 VM_MAXUSER_ADDRESS - VM_MIN_ADDRESS); 653 if (pack.ep_emul_arg) 654 FREE(pack.ep_emul_arg, M_TEMP); 655 FREE(nid.ni_cnd.cn_pnbuf, M_NAMEI); 656 VOP_CLOSE(pack.ep_vp, FREAD, cred, p); 657 vput(pack.ep_vp); 658 uvm_km_free_wakeup(exec_map, (vaddr_t) argp, NCARGS); 659 660 free_pack_abort: 661 free(pack.ep_hdr, M_EXEC); 662 exit1(p, W_EXITCODE(0, SIGABRT)); 663 exit1(p, -1); 664 665 /* NOTREACHED */ 666 p->p_flag &= ~P_INEXEC; 667 return (0); 668 } 669 670 671 void * 672 copyargs(pack, arginfo, stack, argp) 673 struct exec_package *pack; 674 struct ps_strings *arginfo; 675 void *stack; 676 void *argp; 677 { 678 char **cpp = stack; 679 char *dp, *sp; 680 size_t len; 681 void *nullp = NULL; 682 long argc = arginfo->ps_nargvstr; 683 int envc = arginfo->ps_nenvstr; 684 685 if (copyout(&argc, cpp++, sizeof(argc))) 686 return (NULL); 687 688 dp = (char *) (cpp + argc + envc + 2 + pack->ep_emul->e_arglen); 689 sp = argp; 690 691 /* XXX don't copy them out, remap them! */ 692 arginfo->ps_argvstr = cpp; /* remember location of argv for later */ 693 694 for (; --argc >= 0; sp += len, dp += len) 695 if (copyout(&dp, cpp++, sizeof(dp)) || 696 copyoutstr(sp, dp, ARG_MAX, &len)) 697 return (NULL); 698 699 if (copyout(&nullp, cpp++, sizeof(nullp))) 700 return (NULL); 701 702 arginfo->ps_envstr = cpp; /* remember location of envp for later */ 703 704 for (; --envc >= 0; sp += len, dp += len) 705 if (copyout(&dp, cpp++, sizeof(dp)) || 706 copyoutstr(sp, dp, ARG_MAX, &len)) 707 return (NULL); 708 709 if (copyout(&nullp, cpp++, sizeof(nullp))) 710 return (NULL); 711 712 return (cpp); 713 } 714