1 /*- 2 * Copyright (c) 1982, 1986, 1991 The Regents of the University of California. 3 * All rights reserved. 4 * 5 * %sccs.include.proprietary.c% 6 * 7 * @(#)kern_exec.c 7.52 (Berkeley) 02/15/92 8 */ 9 10 #include "param.h" 11 #include "systm.h" 12 #include "filedesc.h" 13 #include "kernel.h" 14 #include "proc.h" 15 #include "mount.h" 16 #include "malloc.h" 17 #include "namei.h" 18 #include "vnode.h" 19 #include "file.h" 20 #include "acct.h" 21 #include "exec.h" 22 #include "ktrace.h" 23 #include "resourcevar.h" 24 25 #include "machine/cpu.h" 26 #include "machine/reg.h" 27 28 #include "mman.h" 29 #include "vm/vm.h" 30 #include "vm/vm_param.h" 31 #include "vm/vm_map.h" 32 #include "vm/vm_kern.h" 33 #include "vm/vm_pager.h" 34 35 #include "signalvar.h" 36 #include "kinfo_proc.h" 37 38 #ifdef HPUXCOMPAT 39 #include "user.h" /* for pcb */ 40 #include "hp300/hpux/hpux_exec.h" 41 #endif 42 43 #ifdef COPY_SIGCODE 44 extern char sigcode[], esigcode[]; 45 #define szsigcode (esigcode - sigcode) 46 #else 47 #define szsigcode 0 48 #endif 49 50 /* 51 * exec system call 52 */ 53 /* ARGSUSED */ 54 execve(p, uap, retval) 55 register struct proc *p; 56 register struct args { 57 char *fname; 58 char **argp; 59 char **envp; 60 } *uap; 61 int *retval; 62 { 63 register struct ucred *cred = p->p_ucred; 64 register struct filedesc *fdp = p->p_fd; 65 int na, ne, ucp, ap, cc, ssize; 66 register char *cp; 67 register int nc; 68 unsigned len; 69 int indir, uid, gid; 70 char *sharg; 71 struct vnode *vp; 72 int resid, error, paged = 0; 73 vm_offset_t execargs = 0; 74 struct vattr vattr; 75 char cfarg[MAXINTERP]; 76 union { 77 char ex_shell[MAXINTERP]; /* #! and interpreter name */ 78 struct exec ex_exec; 79 #ifdef HPUXCOMPAT 80 struct hpux_exec ex_hexec; 81 #endif 82 } exdata; 83 #ifdef HPUXCOMPAT 84 struct hpux_exec hhead; 85 #endif 86 struct nameidata nd; 87 88 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF | SAVENAME, UIO_USERSPACE, 89 uap->fname, p); 90 if (error = namei(&nd)) 91 return (error); 92 vp = nd.ni_vp; 93 indir = 0; 94 uid = cred->cr_uid; 95 gid = cred->cr_gid; 96 if (error = VOP_GETATTR(vp, &vattr, cred, p)) 97 goto bad; 98 if (vp->v_mount->mnt_flag & MNT_NOEXEC) { 99 error = EACCES; 100 goto bad; 101 } 102 if ((vp->v_mount->mnt_flag & MNT_NOSUID) == 0) { 103 if (vattr.va_mode & VSUID) 104 uid = vattr.va_uid; 105 if (vattr.va_mode & VSGID) 106 gid = vattr.va_gid; 107 } 108 109 again: 110 if (error = VOP_ACCESS(vp, VEXEC, cred, p)) 111 goto bad; 112 if ((p->p_flag & STRC) && (error = VOP_ACCESS(vp, VREAD, cred, p))) 113 goto bad; 114 if (vp->v_type != VREG || 115 (vattr.va_mode & (VEXEC|(VEXEC>>3)|(VEXEC>>6))) == 0) { 116 error = EACCES; 117 goto bad; 118 } 119 120 /* 121 * Read in first few bytes of file for segment sizes, magic number: 122 * OMAGIC = plain executable 123 * NMAGIC = RO text 124 * ZMAGIC = demand paged RO text 125 * Also an ASCII line beginning with #! is 126 * the file name of a ``shell'' and arguments may be prepended 127 * to the argument list if given here. 128 * 129 * SHELL NAMES ARE LIMITED IN LENGTH. 130 * 131 * ONLY ONE ARGUMENT MAY BE PASSED TO THE SHELL FROM 132 * THE ASCII LINE. 133 */ 134 exdata.ex_shell[0] = '\0'; /* for zero length files */ 135 error = vn_rdwr(UIO_READ, vp, (caddr_t)&exdata, sizeof (exdata), 136 (off_t)0, UIO_SYSSPACE, (IO_UNIT|IO_NODELOCKED), cred, &resid, 137 (struct proc *)0); 138 if (error) 139 goto bad; 140 #ifndef lint 141 if (resid > sizeof(exdata) - sizeof(exdata.ex_exec) && 142 exdata.ex_shell[0] != '#') { 143 error = ENOEXEC; 144 goto bad; 145 } 146 #endif 147 #if defined(hp300) 148 switch ((int)exdata.ex_exec.a_mid) { 149 150 /* 151 * An ancient hp200 or hp300 binary, shouldn't happen anymore. 152 * Mark as invalid. 153 */ 154 case MID_ZERO: 155 exdata.ex_exec.a_magic = 0; 156 break; 157 158 /* 159 * HP200 series has a smaller page size so we cannot 160 * demand-load or even write protect text, so we just 161 * treat as OMAGIC. 162 */ 163 case MID_HP200: 164 exdata.ex_exec.a_magic = OMAGIC; 165 break; 166 167 case MID_HP300: 168 break; 169 170 #ifdef HPUXCOMPAT 171 case MID_HPUX: 172 /* 173 * Save a.out header. This is eventually saved in the pcb, 174 * but we cannot do that yet in case the exec fails before 175 * the image is overlayed. 176 */ 177 bcopy((caddr_t)&exdata.ex_hexec, 178 (caddr_t)&hhead, sizeof hhead); 179 /* 180 * If version number is 0x2bad this is a native BSD 181 * binary created via the HPUX SGS. Should not be 182 * treated as an HPUX binary. 183 */ 184 if (exdata.ex_hexec.ha_version != BSDVNUM) 185 paged |= SHPUX; /* XXX */ 186 /* 187 * Shuffle important fields to their BSD locations. 188 * Note that the order in which this is done is important. 189 */ 190 exdata.ex_exec.a_text = exdata.ex_hexec.ha_text; 191 exdata.ex_exec.a_data = exdata.ex_hexec.ha_data; 192 exdata.ex_exec.a_bss = exdata.ex_hexec.ha_bss; 193 exdata.ex_exec.a_entry = exdata.ex_hexec.ha_entry; 194 /* 195 * For ZMAGIC files, make sizes consistant with those 196 * generated by BSD ld. 197 */ 198 if (exdata.ex_exec.a_magic == ZMAGIC) { 199 exdata.ex_exec.a_text = 200 ctob(btoc(exdata.ex_exec.a_text)); 201 nc = exdata.ex_exec.a_data + exdata.ex_exec.a_bss; 202 exdata.ex_exec.a_data = 203 ctob(btoc(exdata.ex_exec.a_data)); 204 nc -= (int)exdata.ex_exec.a_data; 205 exdata.ex_exec.a_bss = (nc < 0) ? 0 : nc; 206 } 207 break; 208 #endif 209 } 210 #endif 211 switch ((int)exdata.ex_exec.a_magic) { 212 213 case OMAGIC: 214 #ifdef COFF 215 if (exdata.ex_exec.ex_fhdr.magic != COFF_MAGIC) { 216 error = ENOEXEC; 217 goto bad; 218 } 219 #endif 220 #ifdef sparc 221 if (exdata.ex_exec.a_mid != MID_SUN_SPARC) { 222 error = ENOEXEC; 223 goto bad; 224 } 225 #endif 226 exdata.ex_exec.a_data += exdata.ex_exec.a_text; 227 exdata.ex_exec.a_text = 0; 228 break; 229 230 case ZMAGIC: 231 paged = 1; 232 /* FALLTHROUGH */ 233 234 case NMAGIC: 235 #ifdef COFF 236 if (exdata.ex_exec.ex_fhdr.magic != COFF_MAGIC) { 237 error = ENOEXEC; 238 goto bad; 239 } 240 #endif 241 #ifdef sparc 242 if (exdata.ex_exec.a_mid != MID_SUN_SPARC) { 243 error = ENOEXEC; 244 goto bad; 245 } 246 #endif 247 if (exdata.ex_exec.a_text == 0) { 248 error = ENOEXEC; 249 goto bad; 250 } 251 break; 252 253 default: 254 if (exdata.ex_shell[0] != '#' || 255 exdata.ex_shell[1] != '!' || 256 indir) { 257 error = ENOEXEC; 258 goto bad; 259 } 260 for (cp = &exdata.ex_shell[2];; ++cp) { 261 if (cp >= &exdata.ex_shell[MAXINTERP]) { 262 error = ENOEXEC; 263 goto bad; 264 } 265 if (*cp == '\n') { 266 *cp = '\0'; 267 break; 268 } 269 if (*cp == '\t') 270 *cp = ' '; 271 } 272 cp = &exdata.ex_shell[2]; 273 while (*cp == ' ') 274 cp++; 275 nd.ni_dirp = cp; 276 while (*cp && *cp != ' ') 277 cp++; 278 cfarg[0] = '\0'; 279 if (*cp) { 280 *cp++ = '\0'; 281 while (*cp == ' ') 282 cp++; 283 if (*cp) 284 bcopy((caddr_t)cp, (caddr_t)cfarg, MAXINTERP); 285 } 286 indir = 1; 287 vput(vp); 288 nd.ni_segflg = UIO_SYSSPACE; 289 if (error = namei(&nd)) 290 return (error); 291 vp = nd.ni_vp; 292 if (error = VOP_GETATTR(vp, &vattr, cred, p)) 293 goto bad; 294 uid = cred->cr_uid; /* shell scripts can't be setuid */ 295 gid = cred->cr_gid; 296 goto again; 297 } 298 299 /* 300 * Collect arguments on "file" in swap space. 301 */ 302 na = 0; 303 ne = 0; 304 nc = 0; 305 cc = NCARGS; 306 execargs = kmem_alloc_wait(exec_map, NCARGS); 307 #ifdef DIAGNOSTIC 308 if (execargs == (vm_offset_t)0) 309 panic("execve: kmem_alloc_wait"); 310 #endif 311 cp = (char *) execargs; 312 /* 313 * Copy arguments into file in argdev area. 314 */ 315 if (uap->argp) for (;;) { 316 ap = NULL; 317 sharg = NULL; 318 if (indir && na == 0) { 319 sharg = nd.ni_cnd.cn_nameptr; 320 ap = (int)sharg; 321 uap->argp++; /* ignore argv[0] */ 322 } else if (indir && (na == 1 && cfarg[0])) { 323 sharg = cfarg; 324 ap = (int)sharg; 325 } else if (indir && (na == 1 || na == 2 && cfarg[0])) 326 ap = (int)uap->fname; 327 else if (uap->argp) { 328 ap = fuword((caddr_t)uap->argp); 329 uap->argp++; 330 } 331 if (ap == NULL && uap->envp) { 332 uap->argp = NULL; 333 if ((ap = fuword((caddr_t)uap->envp)) != NULL) 334 uap->envp++, ne++; 335 } 336 if (ap == NULL) 337 break; 338 na++; 339 if (ap == -1) { 340 error = EFAULT; 341 goto bad; 342 } 343 do { 344 if (nc >= NCARGS-1) { 345 error = E2BIG; 346 break; 347 } 348 if (sharg) { 349 error = copystr(sharg, cp, (unsigned)cc, &len); 350 sharg += len; 351 } else { 352 error = copyinstr((caddr_t)ap, cp, (unsigned)cc, 353 &len); 354 ap += len; 355 } 356 cp += len; 357 nc += len; 358 cc -= len; 359 } while (error == ENAMETOOLONG); 360 if (error) 361 goto bad; 362 } 363 364 /* 365 * XXX the following is excessively bogus 366 * 367 * Compute initial process stack size and location of argc 368 * and character strings. `nc' is currently just the number 369 * of characters of arg and env strings. 370 * 371 * nc = size of signal code + 4 bytes of NULL pointer + nc, 372 * rounded to nearest integer; 373 * ucp = USRSTACK - nc; [user characters pointer] 374 * apsize = padding (if any) + 375 * 4 bytes of NULL pointer + 376 * ne 4-byte pointers to env strings + 377 * 4 bytes of NULL pointer + 378 * (na-ne) 4-byte pointers to arg strings + 379 * 4 bytes of argc; 380 * (this is the same as nc + (na+3)*4) 381 * ap = ucp - apsize; [user address of argc] 382 * ssize = ssize + nc + machine-dependent space; 383 */ 384 nc = (szsigcode + 4 + nc + NBPW-1) & ~(NBPW - 1); 385 #ifdef sparc 386 ucp = USRSTACK; 387 ssize = (nc + (na + 3) * NBPW + 7) & ~7; 388 ap = ucp - ssize; 389 ucp -= nc; 390 ssize += sizeof(struct rwindow); 391 #else 392 ssize = (na + 3) * NBPW; 393 ucp = USRSTACK - nc; 394 ap = ucp - ssize; 395 ssize += nc; 396 #endif 397 error = getxfile(p, vp, &exdata.ex_exec, paged, ssize, uid, gid); 398 if (error) 399 goto bad; 400 vput(vp); 401 vp = NULL; 402 403 #ifdef HPUXCOMPAT 404 /* 405 * We are now committed to the exec so we can save the exec 406 * header in the pcb where we can dump it if necessary in core() 407 */ 408 if (p->p_addr->u_pcb.pcb_flags & PCB_HPUXBIN) 409 bcopy((caddr_t)&hhead, 410 (caddr_t)p->p_addr->u_pcb.pcb_exec, sizeof hhead); 411 #endif 412 413 /* 414 * Copy back arglist. 415 */ 416 cpu_setstack(p, ap); 417 (void) suword((caddr_t)ap, na-ne); 418 nc = 0; 419 cp = (char *) execargs; 420 cc = NCARGS; 421 for (;;) { 422 ap += NBPW; 423 if (na == ne) { 424 (void) suword((caddr_t)ap, 0); 425 ap += NBPW; 426 } 427 if (--na < 0) 428 break; 429 (void) suword((caddr_t)ap, ucp); 430 do { 431 error = copyoutstr(cp, (caddr_t)ucp, (unsigned)cc, 432 &len); 433 ucp += len; 434 cp += len; 435 nc += len; 436 cc -= len; 437 } while (error == ENAMETOOLONG); 438 if (error == EFAULT) 439 panic("exec: EFAULT"); 440 } 441 (void) suword((caddr_t)ap, 0); 442 443 execsigs(p); 444 445 for (nc = fdp->fd_lastfile; nc >= 0; --nc) { 446 if (fdp->fd_ofileflags[nc] & UF_EXCLOSE) { 447 (void) closef(fdp->fd_ofiles[nc], p); 448 fdp->fd_ofiles[nc] = NULL; 449 fdp->fd_ofileflags[nc] = 0; 450 if (nc < fdp->fd_freefile) 451 fdp->fd_freefile = nc; 452 } 453 fdp->fd_ofileflags[nc] &= ~UF_MAPPED; 454 } 455 /* 456 * Adjust fd_lastfile to account for descriptors closed above. 457 * Don't decrement fd_lastfile past 0, as it's unsigned. 458 */ 459 while (fdp->fd_lastfile > 0 && fdp->fd_ofiles[fdp->fd_lastfile] == NULL) 460 fdp->fd_lastfile--; 461 setregs(p, exdata.ex_exec.a_entry, retval); 462 #ifdef COPY_SIGCODE 463 /* 464 * Install sigcode at top of user stack. 465 */ 466 copyout((caddr_t)sigcode, (caddr_t)(USRSTACK - szsigcode), szsigcode); 467 #endif 468 /* 469 * Remember file name for accounting. 470 */ 471 p->p_acflag &= ~AFORK; 472 if (nd.ni_cnd.cn_namelen > MAXCOMLEN) 473 nd.ni_cnd.cn_namelen = MAXCOMLEN; 474 bcopy((caddr_t)nd.ni_cnd.cn_nameptr, (caddr_t)p->p_comm, 475 (unsigned)nd.ni_cnd.cn_namelen); 476 p->p_comm[nd.ni_cnd.cn_namelen] = '\0'; 477 cpu_exec(p); 478 bad: 479 FREE(nd.ni_cnd.cn_pnbuf, M_NAMEI); 480 if (execargs) 481 kmem_free_wakeup(exec_map, execargs, NCARGS); 482 if (vp) 483 vput(vp); 484 return (error); 485 } 486 487 /* 488 * Read in and set up memory for executed file. 489 */ 490 getxfile(p, vp, ep, paged, ssize, uid, gid) 491 register struct proc *p; 492 register struct vnode *vp; 493 register struct exec *ep; 494 int paged, ssize, uid, gid; 495 { 496 register struct ucred *cred = p->p_ucred; 497 register struct vmspace *vm = p->p_vmspace; 498 vm_offset_t addr; 499 vm_size_t xts, size; 500 segsz_t ds; 501 off_t toff; 502 int error = 0; 503 504 #ifdef HPUXCOMPAT 505 int hpux = (paged & SHPUX); 506 paged &= ~SHPUX; 507 if (ep->a_mid == MID_HPUX) { 508 if (paged) 509 toff = CLBYTES; 510 else 511 toff = sizeof (struct hpux_exec); 512 } else 513 #endif 514 #ifdef COFF 515 toff = N_TXTOFF(*ep); 516 #else 517 #ifdef sparc 518 if (ep->a_mid == MID_SUN_SPARC) 519 toff = paged ? 0 : sizeof(struct exec); 520 else 521 #endif 522 if (paged) 523 toff = CLBYTES; 524 else 525 toff = sizeof (struct exec); 526 #endif 527 if (ep->a_text != 0 && (vp->v_flag & VTEXT) == 0 && 528 vp->v_writecount != 0) 529 return (ETXTBSY); 530 531 /* 532 * Compute text and data sizes and make sure not too large. 533 * Text size is rounded to an ``ld page''; data+bss is left 534 * in machine pages. Check data and bss separately as they 535 * may overflow when summed together. (XXX not done yet) 536 */ 537 xts = roundup(ep->a_text, __LDPGSZ); 538 ds = clrnd(btoc(ep->a_data + ep->a_bss)); 539 540 /* 541 * If we're sharing the address space, allocate a new space 542 * and release our reference to the old one. Otherwise, 543 * empty out the existing vmspace. 544 */ 545 #ifdef sparc 546 kill_user_windows(p); /* before addrs go away */ 547 #endif 548 if (vm->vm_refcnt > 1) { 549 p->p_vmspace = vmspace_alloc(VM_MIN_ADDRESS, 550 VM_MAXUSER_ADDRESS, 1); 551 vmspace_free(vm); 552 vm = p->p_vmspace; 553 } else { 554 #ifdef SYSVSHM 555 if (vm->vm_shm) 556 shmexit(p); 557 #endif 558 (void) vm_map_remove(&vm->vm_map, VM_MIN_ADDRESS, 559 VM_MAXUSER_ADDRESS); 560 } 561 /* 562 * If parent is waiting for us to exec or exit, 563 * SPPWAIT will be set; clear it and wakeup parent. 564 */ 565 if (p->p_flag & SPPWAIT) { 566 p->p_flag &= ~SPPWAIT; 567 wakeup((caddr_t) p->p_pptr); 568 } 569 #ifdef HPUXCOMPAT 570 p->p_addr->u_pcb.pcb_flags &= ~(PCB_HPUXMMAP|PCB_HPUXBIN); 571 /* remember that we were loaded from an HPUX format file */ 572 if (ep->a_mid == MID_HPUX) 573 p->p_addr->u_pcb.pcb_flags |= PCB_HPUXBIN; 574 if (hpux) 575 p->p_flag |= SHPUX; 576 else 577 p->p_flag &= ~SHPUX; 578 #endif 579 #ifdef ULTRIXCOMPAT 580 /* 581 * Always start out as an ULTRIX process. 582 * A system call in crt0.o will change us to BSD system calls later. 583 */ 584 p->p_md.md_flags |= MDP_ULTRIX; 585 #endif 586 p->p_flag |= SEXEC; 587 #ifndef COFF 588 addr = VM_MIN_ADDRESS; 589 if (vm_allocate(&vm->vm_map, &addr, xts + ctob(ds), FALSE)) { 590 uprintf("Cannot allocate text+data space\n"); 591 error = ENOMEM; /* XXX */ 592 goto badmap; 593 } 594 vm->vm_taddr = (caddr_t)VM_MIN_ADDRESS; 595 vm->vm_daddr = (caddr_t)(VM_MIN_ADDRESS + xts); 596 #else /* COFF */ 597 addr = (vm_offset_t)ep->ex_aout.codeStart; 598 vm->vm_taddr = (caddr_t)addr; 599 if (vm_allocate(&vm->vm_map, &addr, xts, FALSE)) { 600 uprintf("Cannot allocate text space\n"); 601 error = ENOMEM; /* XXX */ 602 goto badmap; 603 } 604 addr = (vm_offset_t)ep->ex_aout.heapStart; 605 vm->vm_daddr = (caddr_t)addr; 606 if (vm_allocate(&vm->vm_map, &addr, round_page(ctob(ds)), FALSE)) { 607 uprintf("Cannot allocate data space\n"); 608 error = ENOMEM; /* XXX */ 609 goto badmap; 610 } 611 #endif /* COFF */ 612 size = round_page(MAXSSIZ); /* XXX */ 613 #ifdef i386 614 addr = trunc_page(USRSTACK - size) - NBPG; /* XXX */ 615 #else 616 addr = trunc_page(USRSTACK - size); 617 #endif 618 if (vm_allocate(&vm->vm_map, &addr, size, FALSE)) { 619 uprintf("Cannot allocate stack space\n"); 620 error = ENOMEM; /* XXX */ 621 goto badmap; 622 } 623 size -= round_page(p->p_rlimit[RLIMIT_STACK].rlim_cur); 624 if (vm_map_protect(&vm->vm_map, addr, addr+size, VM_PROT_NONE, FALSE)) { 625 uprintf("Cannot protect stack space\n"); 626 error = ENOMEM; 627 goto badmap; 628 } 629 vm->vm_maxsaddr = (caddr_t)addr; 630 631 if (paged == 0) { 632 /* 633 * Read in data segment. 634 */ 635 (void) vn_rdwr(UIO_READ, vp, vm->vm_daddr, (int) ep->a_data, 636 (off_t)(toff + ep->a_text), UIO_USERSPACE, 637 (IO_UNIT|IO_NODELOCKED), cred, (int *)0, p); 638 /* 639 * Read in text segment if necessary (0410), 640 * and read-protect it. 641 */ 642 if (ep->a_text > 0) { 643 error = vn_rdwr(UIO_READ, vp, vm->vm_taddr, 644 (int)ep->a_text, toff, UIO_USERSPACE, 645 (IO_UNIT|IO_NODELOCKED), cred, (int *)0, p); 646 (void) vm_map_protect(&vm->vm_map, vm->vm_taddr, 647 vm->vm_taddr + trunc_page(ep->a_text), 648 VM_PROT_READ|VM_PROT_EXECUTE, FALSE); 649 } 650 } else { 651 /* 652 * Allocate a region backed by the exec'ed vnode. 653 */ 654 #ifndef COFF 655 addr = VM_MIN_ADDRESS; 656 size = round_page(xts + ep->a_data); 657 error = vm_mmap(&vm->vm_map, &addr, size, VM_PROT_ALL, 658 MAP_FILE|MAP_COPY|MAP_FIXED, 659 (caddr_t)vp, (vm_offset_t)toff); 660 (void) vm_map_protect(&vm->vm_map, addr, addr + xts, 661 VM_PROT_READ|VM_PROT_EXECUTE, FALSE); 662 #else /* COFF */ 663 addr = (vm_offset_t)vm->vm_taddr; 664 size = xts; 665 error = vm_mmap(&vm->vm_map, &addr, size, 666 VM_PROT_READ|VM_PROT_EXECUTE, 667 MAP_FILE|MAP_COPY|MAP_FIXED, 668 (caddr_t)vp, (vm_offset_t)toff); 669 toff += size; 670 addr = (vm_offset_t)vm->vm_daddr; 671 size = round_page(ep->a_data); 672 error = vm_mmap(&vm->vm_map, &addr, size, VM_PROT_ALL, 673 MAP_FILE|MAP_COPY|MAP_FIXED, 674 (caddr_t)vp, (vm_offset_t)toff); 675 #endif /* COFF */ 676 vp->v_flag |= VTEXT; 677 } 678 if (error) { 679 badmap: 680 printf("pid %d: VM allocation failure\n", p->p_pid); 681 uprintf("sorry, pid %d was killed in exec: VM allocation\n", 682 p->p_pid); 683 psignal(p, SIGKILL); 684 p->p_flag |= SKEEP; 685 return(error); 686 } 687 688 /* 689 * set SUID/SGID protections, if no tracing 690 */ 691 if ((p->p_flag&STRC)==0) { 692 if (uid != cred->cr_uid || gid != cred->cr_gid) { 693 p->p_ucred = cred = crcopy(cred); 694 /* 695 * If process is being ktraced, turn off - unless 696 * root set it. 697 */ 698 if (p->p_tracep && !(p->p_traceflag & KTRFAC_ROOT)) { 699 vrele(p->p_tracep); 700 p->p_tracep = NULL; 701 p->p_traceflag = 0; 702 } 703 cred->cr_uid = uid; 704 cred->cr_gid = gid; 705 } 706 } else 707 psignal(p, SIGTRAP); 708 p->p_cred->p_svuid = cred->cr_uid; 709 p->p_cred->p_svgid = cred->cr_gid; 710 vm->vm_tsize = btoc(xts); 711 vm->vm_dsize = ds; 712 vm->vm_ssize = ssize; 713 p->p_stats->p_prof.pr_scale = 0; 714 #if defined(tahoe) 715 /* move this when tahoe cpu_exec is created */ 716 p->p_addr->u_pcb.pcb_savacc.faddr = (float *)NULL; 717 #endif 718 return (0); 719 } 720