Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/kern/kern_exec.c
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1 /* $NetBSD: kern_exec.c,v 1.194.4.11 2005/10/31 13:25:31 tron Exp $ */ 2 3 /*- 4 * Copyright (C) 1993, 1994, 1996 Christopher G. Demetriou 5 * Copyright (C) 1992 Wolfgang Solfrank. 6 * Copyright (C) 1992 TooLs GmbH. 7 * All rights reserved. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 3. All advertising materials mentioning features or use of this software 18 * must display the following acknowledgement: 19 * This product includes software developed by TooLs GmbH. 20 * 4. The name of TooLs GmbH may not be used to endorse or promote products 21 * derived from this software without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``AS IS'' AND ANY EXPRESS OR 24 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 25 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 26 * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 27 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 28 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; 29 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 30 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 31 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 32 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 33 */ 34 35 #include <sys/cdefs.h> 36 __KERNEL_RCSID(0, "$NetBSD: kern_exec.c,v 1.194.4.11 2005/10/31 13:25:31 tron Exp $"); 37 38 #include "opt_ktrace.h" 39 #include "opt_syscall_debug.h" 40 #include "opt_compat_netbsd.h" 41 #include "opt_verified_exec.h" 42 43 #include <sys/param.h> 44 #include <sys/systm.h> 45 #include <sys/filedesc.h> 46 #include <sys/kernel.h> 47 #include <sys/proc.h> 48 #include <sys/mount.h> 49 #include <sys/malloc.h> 50 #include <sys/namei.h> 51 #include <sys/vnode.h> 52 #include <sys/file.h> 53 #include <sys/acct.h> 54 #include <sys/exec.h> 55 #include <sys/ktrace.h> 56 #include <sys/resourcevar.h> 57 #include <sys/wait.h> 58 #include <sys/mman.h> 59 #include <sys/ras.h> 60 #include <sys/signalvar.h> 61 #include <sys/stat.h> 62 #include <sys/syscall.h> 63 64 #include <sys/sa.h> 65 #include <sys/savar.h> 66 #include <sys/syscallargs.h> 67 #ifdef VERIFIED_EXEC 68 #include <sys/verified_exec.h> 69 #endif 70 71 #include <uvm/uvm_extern.h> 72 73 #include <machine/cpu.h> 74 #include <machine/reg.h> 75 76 static int exec_sigcode_map(struct proc *, const struct emul *); 77 78 #ifdef DEBUG_EXEC 79 #define DPRINTF(a) uprintf a 80 #else 81 #define DPRINTF(a) 82 #endif /* DEBUG_EXEC */ 83 84 MALLOC_DEFINE(M_EXEC, "exec", "argument lists & other mem used by exec"); 85 86 /* 87 * Exec function switch: 88 * 89 * Note that each makecmds function is responsible for loading the 90 * exec package with the necessary functions for any exec-type-specific 91 * handling. 92 * 93 * Functions for specific exec types should be defined in their own 94 * header file. 95 */ 96 extern const struct execsw execsw_builtin[]; 97 extern int nexecs_builtin; 98 static const struct execsw **execsw = NULL; 99 static int nexecs; 100 101 u_int exec_maxhdrsz; /* must not be static - netbsd32 needs it */ 102 103 #ifdef LKM 104 /* list of supported emulations */ 105 static 106 LIST_HEAD(emlist_head, emul_entry) el_head = LIST_HEAD_INITIALIZER(el_head); 107 struct emul_entry { 108 LIST_ENTRY(emul_entry) el_list; 109 const struct emul *el_emul; 110 int ro_entry; 111 }; 112 113 /* list of dynamically loaded execsw entries */ 114 static 115 LIST_HEAD(execlist_head, exec_entry) ex_head = LIST_HEAD_INITIALIZER(ex_head); 116 struct exec_entry { 117 LIST_ENTRY(exec_entry) ex_list; 118 const struct execsw *es; 119 }; 120 121 /* structure used for building execw[] */ 122 struct execsw_entry { 123 struct execsw_entry *next; 124 const struct execsw *es; 125 }; 126 #endif /* LKM */ 127 128 #ifdef SYSCALL_DEBUG 129 extern const char * const syscallnames[]; 130 #endif 131 #ifdef __HAVE_SYSCALL_INTERN 132 void syscall_intern(struct proc *); 133 #else 134 void syscall(void); 135 #endif 136 137 #ifdef COMPAT_16 138 extern char sigcode[], esigcode[]; 139 struct uvm_object *emul_netbsd_object; 140 #endif 141 142 /* NetBSD emul struct */ 143 const struct emul emul_netbsd = { 144 "netbsd", 145 NULL, /* emulation path */ 146 #ifndef __HAVE_MINIMAL_EMUL 147 EMUL_HAS_SYS___syscall, 148 NULL, 149 SYS_syscall, 150 SYS_NSYSENT, 151 #endif 152 sysent, 153 #ifdef SYSCALL_DEBUG 154 syscallnames, 155 #else 156 NULL, 157 #endif 158 sendsig, 159 trapsignal, 160 NULL, 161 #ifdef COMPAT_16 162 sigcode, 163 esigcode, 164 &emul_netbsd_object, 165 #else 166 NULL, 167 NULL, 168 NULL, 169 #endif 170 setregs, 171 NULL, 172 NULL, 173 NULL, 174 NULL, 175 NULL, 176 #ifdef __HAVE_SYSCALL_INTERN 177 syscall_intern, 178 #else 179 syscall, 180 #endif 181 NULL, 182 NULL, 183 184 uvm_default_mapaddr, 185 }; 186 187 #ifdef LKM 188 /* 189 * Exec lock. Used to control access to execsw[] structures. 190 * This must not be static so that netbsd32 can access it, too. 191 */ 192 struct lock exec_lock; 193 194 static void link_es(struct execsw_entry **, const struct execsw *); 195 #endif /* LKM */ 196 197 /* 198 * check exec: 199 * given an "executable" described in the exec package's namei info, 200 * see what we can do with it. 201 * 202 * ON ENTRY: 203 * exec package with appropriate namei info 204 * proc pointer of exec'ing proc 205 * if verified exec enabled then flag indicating a direct exec or 206 * an indirect exec (i.e. for a shell script interpreter) 207 * NO SELF-LOCKED VNODES 208 * 209 * ON EXIT: 210 * error: nothing held, etc. exec header still allocated. 211 * ok: filled exec package, executable's vnode (unlocked). 212 * 213 * EXEC SWITCH ENTRY: 214 * Locked vnode to check, exec package, proc. 215 * 216 * EXEC SWITCH EXIT: 217 * ok: return 0, filled exec package, executable's vnode (unlocked). 218 * error: destructive: 219 * everything deallocated execept exec header. 220 * non-destructive: 221 * error code, executable's vnode (unlocked), 222 * exec header unmodified. 223 */ 224 int 225 /*ARGSUSED*/ 226 check_exec(struct proc *p, struct exec_package *epp, int flag) 227 { 228 int error, i; 229 struct vnode *vp; 230 struct nameidata *ndp; 231 size_t resid; 232 233 ndp = epp->ep_ndp; 234 ndp->ni_cnd.cn_nameiop = LOOKUP; 235 ndp->ni_cnd.cn_flags = FOLLOW | LOCKLEAF | SAVENAME; 236 /* first get the vnode */ 237 if ((error = namei(ndp)) != 0) 238 return error; 239 epp->ep_vp = vp = ndp->ni_vp; 240 241 /* check access and type */ 242 if (vp->v_type != VREG) { 243 error = EACCES; 244 goto bad1; 245 } 246 if ((error = VOP_ACCESS(vp, VEXEC, p->p_ucred, p)) != 0) 247 goto bad1; 248 249 /* get attributes */ 250 if ((error = VOP_GETATTR(vp, epp->ep_vap, p->p_ucred, p)) != 0) 251 goto bad1; 252 253 /* Check mount point */ 254 if (vp->v_mount->mnt_flag & MNT_NOEXEC) { 255 error = EACCES; 256 goto bad1; 257 } 258 if (vp->v_mount->mnt_flag & MNT_NOSUID) 259 epp->ep_vap->va_mode &= ~(S_ISUID | S_ISGID); 260 261 /* try to open it */ 262 if ((error = VOP_OPEN(vp, FREAD, p->p_ucred, p)) != 0) 263 goto bad1; 264 265 /* unlock vp, since we need it unlocked from here on out. */ 266 VOP_UNLOCK(vp, 0); 267 268 269 #ifdef VERIFIED_EXEC 270 if ((error = veriexec_verify(p, vp, epp->ep_vap, epp->ep_ndp->ni_dirp, 271 flag, NULL)) != 0) 272 goto bad2; 273 #endif 274 275 /* now we have the file, get the exec header */ 276 uvn_attach(vp, VM_PROT_READ); 277 error = vn_rdwr(UIO_READ, vp, epp->ep_hdr, epp->ep_hdrlen, 0, 278 UIO_SYSSPACE, 0, p->p_ucred, &resid, NULL); 279 if (error) 280 goto bad2; 281 epp->ep_hdrvalid = epp->ep_hdrlen - resid; 282 283 /* 284 * Set up default address space limits. Can be overridden 285 * by individual exec packages. 286 * 287 * XXX probably should be all done in the exec pakages. 288 */ 289 epp->ep_vm_minaddr = VM_MIN_ADDRESS; 290 epp->ep_vm_maxaddr = VM_MAXUSER_ADDRESS; 291 /* 292 * set up the vmcmds for creation of the process 293 * address space 294 */ 295 error = ENOEXEC; 296 for (i = 0; i < nexecs && error != 0; i++) { 297 int newerror; 298 299 epp->ep_esch = execsw[i]; 300 newerror = (*execsw[i]->es_makecmds)(p, epp); 301 /* make sure the first "interesting" error code is saved. */ 302 if (!newerror || error == ENOEXEC) 303 error = newerror; 304 305 /* if es_makecmds call was successful, update epp->ep_es */ 306 if (!newerror && (epp->ep_flags & EXEC_HASES) == 0) 307 epp->ep_es = execsw[i]; 308 309 if (epp->ep_flags & EXEC_DESTR && error != 0) 310 return error; 311 } 312 if (!error) { 313 /* check that entry point is sane */ 314 if (epp->ep_entry > VM_MAXUSER_ADDRESS) 315 error = ENOEXEC; 316 317 /* check limits */ 318 if ((epp->ep_tsize > MAXTSIZ) || 319 (epp->ep_dsize > 320 (u_quad_t)p->p_rlimit[RLIMIT_DATA].rlim_cur)) 321 error = ENOMEM; 322 323 if (!error) 324 return (0); 325 } 326 327 /* 328 * free any vmspace-creation commands, 329 * and release their references 330 */ 331 kill_vmcmds(&epp->ep_vmcmds); 332 333 bad2: 334 /* 335 * close and release the vnode, restore the old one, free the 336 * pathname buf, and punt. 337 */ 338 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 339 VOP_CLOSE(vp, FREAD, p->p_ucred, p); 340 vput(vp); 341 PNBUF_PUT(ndp->ni_cnd.cn_pnbuf); 342 return error; 343 344 bad1: 345 /* 346 * free the namei pathname buffer, and put the vnode 347 * (which we don't yet have open). 348 */ 349 vput(vp); /* was still locked */ 350 PNBUF_PUT(ndp->ni_cnd.cn_pnbuf); 351 return error; 352 } 353 354 #ifdef __MACHINE_STACK_GROWS_UP 355 #define STACK_PTHREADSPACE NBPG 356 #else 357 #define STACK_PTHREADSPACE 0 358 #endif 359 360 /* 361 * exec system call 362 */ 363 /* ARGSUSED */ 364 int 365 sys_execve(struct lwp *l, void *v, register_t *retval) 366 { 367 struct sys_execve_args /* { 368 syscallarg(const char *) path; 369 syscallarg(char * const *) argp; 370 syscallarg(char * const *) envp; 371 } */ *uap = v; 372 int error; 373 u_int i; 374 struct exec_package pack; 375 struct nameidata nid; 376 struct vattr attr; 377 struct proc *p; 378 struct ucred *cred; 379 char *argp; 380 char * const *cpp; 381 char *dp, *sp; 382 long argc, envc; 383 size_t len; 384 char *stack; 385 struct ps_strings arginfo; 386 struct vmspace *vm; 387 char **tmpfap; 388 int szsigcode; 389 struct exec_vmcmd *base_vcp; 390 int oldlwpflags; 391 392 /* Disable scheduler activation upcalls. */ 393 oldlwpflags = l->l_flag & (L_SA | L_SA_UPCALL); 394 if (l->l_flag & L_SA) 395 l->l_flag &= ~(L_SA | L_SA_UPCALL); 396 397 p = l->l_proc; 398 /* 399 * Lock the process and set the P_INEXEC flag to indicate that 400 * it should be left alone until we're done here. This is 401 * necessary to avoid race conditions - e.g. in ptrace() - 402 * that might allow a local user to illicitly obtain elevated 403 * privileges. 404 */ 405 p->p_flag |= P_INEXEC; 406 407 cred = p->p_ucred; 408 base_vcp = NULL; 409 /* 410 * Init the namei data to point the file user's program name. 411 * This is done here rather than in check_exec(), so that it's 412 * possible to override this settings if any of makecmd/probe 413 * functions call check_exec() recursively - for example, 414 * see exec_script_makecmds(). 415 */ 416 NDINIT(&nid, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 417 418 /* 419 * initialize the fields of the exec package. 420 */ 421 pack.ep_name = SCARG(uap, path); 422 pack.ep_hdr = malloc(exec_maxhdrsz, M_EXEC, M_WAITOK); 423 pack.ep_hdrlen = exec_maxhdrsz; 424 pack.ep_hdrvalid = 0; 425 pack.ep_ndp = &nid; 426 pack.ep_emul_arg = NULL; 427 pack.ep_vmcmds.evs_cnt = 0; 428 pack.ep_vmcmds.evs_used = 0; 429 pack.ep_vap = &attr; 430 pack.ep_flags = 0; 431 432 #ifdef LKM 433 lockmgr(&exec_lock, LK_SHARED, NULL); 434 #endif 435 436 /* see if we can run it. */ 437 #ifdef VERIFIED_EXEC 438 if ((error = check_exec(p, &pack, VERIEXEC_DIRECT)) != 0) 439 #else 440 if ((error = check_exec(p, &pack, 0)) != 0) 441 #endif 442 goto freehdr; 443 444 /* XXX -- THE FOLLOWING SECTION NEEDS MAJOR CLEANUP */ 445 446 /* allocate an argument buffer */ 447 argp = (char *) uvm_km_valloc_wait(exec_map, NCARGS); 448 #ifdef DIAGNOSTIC 449 if (argp == (vaddr_t) 0) 450 panic("execve: argp == NULL"); 451 #endif 452 dp = argp; 453 argc = 0; 454 455 /* copy the fake args list, if there's one, freeing it as we go */ 456 if (pack.ep_flags & EXEC_HASARGL) { 457 tmpfap = pack.ep_fa; 458 while (*tmpfap != NULL) { 459 char *cp; 460 461 cp = *tmpfap; 462 while (*cp) 463 *dp++ = *cp++; 464 dp++; 465 466 FREE(*tmpfap, M_EXEC); 467 tmpfap++; argc++; 468 } 469 FREE(pack.ep_fa, M_EXEC); 470 pack.ep_flags &= ~EXEC_HASARGL; 471 } 472 473 /* Now get argv & environment */ 474 if (!(cpp = SCARG(uap, argp))) { 475 error = EINVAL; 476 goto bad; 477 } 478 479 if (pack.ep_flags & EXEC_SKIPARG) 480 cpp++; 481 482 while (1) { 483 len = argp + ARG_MAX - dp; 484 if ((error = copyin(cpp, &sp, sizeof(sp))) != 0) 485 goto bad; 486 if (!sp) 487 break; 488 if ((error = copyinstr(sp, dp, len, &len)) != 0) { 489 if (error == ENAMETOOLONG) 490 error = E2BIG; 491 goto bad; 492 } 493 #ifdef KTRACE 494 if (KTRPOINT(p, KTR_EXEC_ARG)) 495 ktrkmem(p, KTR_EXEC_ARG, dp, len - 1); 496 #endif 497 dp += len; 498 cpp++; 499 argc++; 500 } 501 502 envc = 0; 503 /* environment need not be there */ 504 if ((cpp = SCARG(uap, envp)) != NULL ) { 505 while (1) { 506 len = argp + ARG_MAX - dp; 507 if ((error = copyin(cpp, &sp, sizeof(sp))) != 0) 508 goto bad; 509 if (!sp) 510 break; 511 if ((error = copyinstr(sp, dp, len, &len)) != 0) { 512 if (error == ENAMETOOLONG) 513 error = E2BIG; 514 goto bad; 515 } 516 #ifdef KTRACE 517 if (KTRPOINT(p, KTR_EXEC_ENV)) 518 ktrkmem(p, KTR_EXEC_ENV, dp, len - 1); 519 #endif 520 dp += len; 521 cpp++; 522 envc++; 523 } 524 } 525 526 dp = (char *) ALIGN(dp); 527 528 szsigcode = pack.ep_es->es_emul->e_esigcode - 529 pack.ep_es->es_emul->e_sigcode; 530 531 /* Now check if args & environ fit into new stack */ 532 if (pack.ep_flags & EXEC_32) 533 len = ((argc + envc + 2 + pack.ep_es->es_arglen) * 534 sizeof(int) + sizeof(int) + dp + STACKGAPLEN + 535 szsigcode + sizeof(struct ps_strings) + STACK_PTHREADSPACE) 536 - argp; 537 else 538 len = ((argc + envc + 2 + pack.ep_es->es_arglen) * 539 sizeof(char *) + sizeof(int) + dp + STACKGAPLEN + 540 szsigcode + sizeof(struct ps_strings) + STACK_PTHREADSPACE) 541 - argp; 542 543 len = ALIGN(len); /* make the stack "safely" aligned */ 544 545 if (len > pack.ep_ssize) { /* in effect, compare to initial limit */ 546 error = ENOMEM; 547 goto bad; 548 } 549 550 /* Get rid of other LWPs/ */ 551 p->p_flag |= P_WEXIT; /* XXX hack. lwp-exit stuff wants to see it. */ 552 exit_lwps(l); 553 p->p_flag &= ~P_WEXIT; 554 KDASSERT(p->p_nlwps == 1); 555 556 /* This is now LWP 1 */ 557 l->l_lid = 1; 558 p->p_nlwpid = 1; 559 560 /* Release any SA state. */ 561 if (p->p_sa) 562 sa_release(p); 563 564 /* Remove POSIX timers */ 565 timers_free(p, TIMERS_POSIX); 566 567 /* adjust "active stack depth" for process VSZ */ 568 pack.ep_ssize = len; /* maybe should go elsewhere, but... */ 569 570 /* 571 * Do whatever is necessary to prepare the address space 572 * for remapping. Note that this might replace the current 573 * vmspace with another! 574 */ 575 uvmspace_exec(l, pack.ep_vm_minaddr, pack.ep_vm_maxaddr); 576 577 /* record proc's vnode, for use by procfs and others */ 578 if (p->p_textvp) 579 vrele(p->p_textvp); 580 VREF(pack.ep_vp); 581 p->p_textvp = pack.ep_vp; 582 583 /* Now map address space */ 584 vm = p->p_vmspace; 585 vm->vm_taddr = (caddr_t) pack.ep_taddr; 586 vm->vm_tsize = btoc(pack.ep_tsize); 587 vm->vm_daddr = (caddr_t) pack.ep_daddr; 588 vm->vm_dsize = btoc(pack.ep_dsize); 589 vm->vm_ssize = btoc(pack.ep_ssize); 590 vm->vm_maxsaddr = (caddr_t) pack.ep_maxsaddr; 591 vm->vm_minsaddr = (caddr_t) pack.ep_minsaddr; 592 593 /* create the new process's VM space by running the vmcmds */ 594 #ifdef DIAGNOSTIC 595 if (pack.ep_vmcmds.evs_used == 0) 596 panic("execve: no vmcmds"); 597 #endif 598 for (i = 0; i < pack.ep_vmcmds.evs_used && !error; i++) { 599 struct exec_vmcmd *vcp; 600 601 vcp = &pack.ep_vmcmds.evs_cmds[i]; 602 if (vcp->ev_flags & VMCMD_RELATIVE) { 603 #ifdef DIAGNOSTIC 604 if (base_vcp == NULL) 605 panic("execve: relative vmcmd with no base"); 606 if (vcp->ev_flags & VMCMD_BASE) 607 panic("execve: illegal base & relative vmcmd"); 608 #endif 609 vcp->ev_addr += base_vcp->ev_addr; 610 } 611 error = (*vcp->ev_proc)(p, vcp); 612 #ifdef DEBUG_EXEC 613 if (error) { 614 int j; 615 struct exec_vmcmd *vp = &pack.ep_vmcmds.evs_cmds[0]; 616 for (j = 0; j <= i; j++) 617 uprintf( 618 "vmcmd[%d] = %#lx/%#lx fd@%#lx prot=0%o flags=%d\n", 619 j, vp[j].ev_addr, vp[j].ev_len, 620 vp[j].ev_offset, vp[j].ev_prot, 621 vp[j].ev_flags); 622 } 623 #endif /* DEBUG_EXEC */ 624 if (vcp->ev_flags & VMCMD_BASE) 625 base_vcp = vcp; 626 } 627 628 /* free the vmspace-creation commands, and release their references */ 629 kill_vmcmds(&pack.ep_vmcmds); 630 631 vn_lock(pack.ep_vp, LK_EXCLUSIVE | LK_RETRY); 632 VOP_CLOSE(pack.ep_vp, FREAD, cred, p); 633 vput(pack.ep_vp); 634 635 /* if an error happened, deallocate and punt */ 636 if (error) { 637 DPRINTF(("execve: vmcmd %i failed: %d\n", i - 1, error)); 638 goto exec_abort; 639 } 640 641 /* remember information about the process */ 642 arginfo.ps_nargvstr = argc; 643 arginfo.ps_nenvstr = envc; 644 645 stack = (char *)STACK_ALLOC(STACK_GROW(vm->vm_minsaddr, 646 STACK_PTHREADSPACE + sizeof(struct ps_strings) + szsigcode), 647 len - (sizeof(struct ps_strings) + szsigcode)); 648 #ifdef __MACHINE_STACK_GROWS_UP 649 /* 650 * The copyargs call always copies into lower addresses 651 * first, moving towards higher addresses, starting with 652 * the stack pointer that we give. When the stack grows 653 * down, this puts argc/argv/envp very shallow on the 654 * stack, right at the first user stack pointer, and puts 655 * STACKGAPLEN very deep in the stack. When the stack 656 * grows up, the situation is reversed. 657 * 658 * Normally, this is no big deal. But the ld_elf.so _rtld() 659 * function expects to be called with a single pointer to 660 * a region that has a few words it can stash values into, 661 * followed by argc/argv/envp. When the stack grows down, 662 * it's easy to decrement the stack pointer a little bit to 663 * allocate the space for these few words and pass the new 664 * stack pointer to _rtld. When the stack grows up, however, 665 * a few words before argc is part of the signal trampoline, XXX 666 * so we have a problem. 667 * 668 * Instead of changing how _rtld works, we take the easy way 669 * out and steal 32 bytes before we call copyargs. This 670 * space is effectively stolen from STACKGAPLEN. 671 */ 672 stack += 32; 673 #endif /* __MACHINE_STACK_GROWS_UP */ 674 675 /* Now copy argc, args & environ to new stack */ 676 error = (*pack.ep_es->es_copyargs)(p, &pack, &arginfo, &stack, argp); 677 if (error) { 678 DPRINTF(("execve: copyargs failed %d\n", error)); 679 goto exec_abort; 680 } 681 /* Move the stack back to original point */ 682 stack = (char *)STACK_GROW(vm->vm_minsaddr, len); 683 684 /* fill process ps_strings info */ 685 p->p_psstr = (struct ps_strings *) 686 STACK_ALLOC(STACK_GROW(vm->vm_minsaddr, STACK_PTHREADSPACE), 687 sizeof(struct ps_strings)); 688 p->p_psargv = offsetof(struct ps_strings, ps_argvstr); 689 p->p_psnargv = offsetof(struct ps_strings, ps_nargvstr); 690 p->p_psenv = offsetof(struct ps_strings, ps_envstr); 691 p->p_psnenv = offsetof(struct ps_strings, ps_nenvstr); 692 693 /* copy out the process's ps_strings structure */ 694 if ((error = copyout(&arginfo, (char *)p->p_psstr, 695 sizeof(arginfo))) != 0) { 696 DPRINTF(("execve: ps_strings copyout %p->%p size %ld failed\n", 697 &arginfo, (char *)p->p_psstr, (long)sizeof(arginfo))); 698 goto exec_abort; 699 } 700 701 stopprofclock(p); /* stop profiling */ 702 fdcloseexec(p); /* handle close on exec */ 703 execsigs(p); /* reset catched signals */ 704 705 l->l_ctxlink = NULL; /* reset ucontext link */ 706 707 /* set command name & other accounting info */ 708 len = min(nid.ni_cnd.cn_namelen, MAXCOMLEN); 709 memcpy(p->p_comm, nid.ni_cnd.cn_nameptr, len); 710 p->p_comm[len] = 0; 711 p->p_acflag &= ~AFORK; 712 713 p->p_flag |= P_EXEC; 714 if (p->p_flag & P_PPWAIT) { 715 p->p_flag &= ~P_PPWAIT; 716 wakeup((caddr_t) p->p_pptr); 717 } 718 719 /* 720 * deal with set[ug]id. 721 * MNT_NOSUID has already been used to disable s[ug]id. 722 */ 723 if ((p->p_flag & P_TRACED) == 0 && 724 725 (((attr.va_mode & S_ISUID) != 0 && 726 p->p_ucred->cr_uid != attr.va_uid) || 727 728 ((attr.va_mode & S_ISGID) != 0 && 729 p->p_ucred->cr_gid != attr.va_gid))) { 730 /* 731 * Mark the process as SUGID before we do 732 * anything that might block. 733 */ 734 p_sugid(p); 735 736 /* Make sure file descriptors 0..2 are in use. */ 737 if ((error = fdcheckstd(p)) != 0) 738 goto exec_abort; 739 740 p->p_ucred = crcopy(cred); 741 #ifdef KTRACE 742 /* 743 * If process is being ktraced, turn off - unless 744 * root set it. 745 */ 746 if (p->p_tracep && !(p->p_traceflag & KTRFAC_ROOT)) 747 ktrderef(p); 748 #endif 749 if (attr.va_mode & S_ISUID) 750 p->p_ucred->cr_uid = attr.va_uid; 751 if (attr.va_mode & S_ISGID) 752 p->p_ucred->cr_gid = attr.va_gid; 753 } else { 754 if (p->p_ucred->cr_uid == p->p_cred->p_ruid && 755 p->p_ucred->cr_gid == p->p_cred->p_rgid) 756 p->p_flag &= ~P_SUGID; 757 } 758 p->p_cred->p_svuid = p->p_ucred->cr_uid; 759 p->p_cred->p_svgid = p->p_ucred->cr_gid; 760 761 #if defined(__HAVE_RAS) 762 /* 763 * Remove all RASs from the address space. 764 */ 765 ras_purgeall(p); 766 #endif 767 768 doexechooks(p); 769 770 uvm_km_free_wakeup(exec_map, (vaddr_t) argp, NCARGS); 771 772 PNBUF_PUT(nid.ni_cnd.cn_pnbuf); 773 774 /* notify others that we exec'd */ 775 KNOTE(&p->p_klist, NOTE_EXEC); 776 777 /* setup new registers and do misc. setup. */ 778 (*pack.ep_es->es_emul->e_setregs)(l, &pack, (u_long) stack); 779 if (pack.ep_es->es_setregs) 780 (*pack.ep_es->es_setregs)(l, &pack, (u_long) stack); 781 782 /* map the process's signal trampoline code */ 783 if (exec_sigcode_map(p, pack.ep_es->es_emul)) 784 goto exec_abort; 785 786 if (p->p_flag & P_TRACED) 787 psignal(p, SIGTRAP); 788 789 free(pack.ep_hdr, M_EXEC); 790 791 /* 792 * Call emulation specific exec hook. This can setup per-process 793 * p->p_emuldata or do any other per-process stuff an emulation needs. 794 * 795 * If we are executing process of different emulation than the 796 * original forked process, call e_proc_exit() of the old emulation 797 * first, then e_proc_exec() of new emulation. If the emulation is 798 * same, the exec hook code should deallocate any old emulation 799 * resources held previously by this process. 800 */ 801 if (p->p_emul && p->p_emul->e_proc_exit 802 && p->p_emul != pack.ep_es->es_emul) 803 (*p->p_emul->e_proc_exit)(p); 804 805 /* 806 * Call exec hook. Emulation code may NOT store reference to anything 807 * from &pack. 808 */ 809 if (pack.ep_es->es_emul->e_proc_exec) 810 (*pack.ep_es->es_emul->e_proc_exec)(p, &pack); 811 812 /* update p_emul, the old value is no longer needed */ 813 p->p_emul = pack.ep_es->es_emul; 814 815 /* ...and the same for p_execsw */ 816 p->p_execsw = pack.ep_es; 817 818 #ifdef __HAVE_SYSCALL_INTERN 819 (*p->p_emul->e_syscall_intern)(p); 820 #endif 821 #ifdef KTRACE 822 if (KTRPOINT(p, KTR_EMUL)) 823 ktremul(p); 824 #endif 825 826 #ifdef LKM 827 lockmgr(&exec_lock, LK_RELEASE, NULL); 828 #endif 829 p->p_flag &= ~P_INEXEC; 830 831 if (p->p_flag & P_STOPEXEC) { 832 int s; 833 834 sigminusset(&contsigmask, &p->p_sigctx.ps_siglist); 835 SCHED_LOCK(s); 836 p->p_pptr->p_nstopchild++; 837 p->p_stat = SSTOP; 838 l->l_stat = LSSTOP; 839 p->p_nrlwps--; 840 mi_switch(l, NULL); 841 SCHED_ASSERT_UNLOCKED(); 842 splx(s); 843 } 844 845 return (EJUSTRETURN); 846 847 bad: 848 p->p_flag &= ~P_INEXEC; 849 /* free the vmspace-creation commands, and release their references */ 850 kill_vmcmds(&pack.ep_vmcmds); 851 /* kill any opened file descriptor, if necessary */ 852 if (pack.ep_flags & EXEC_HASFD) { 853 pack.ep_flags &= ~EXEC_HASFD; 854 (void) fdrelease(p, pack.ep_fd); 855 } 856 /* close and put the exec'd file */ 857 vn_lock(pack.ep_vp, LK_EXCLUSIVE | LK_RETRY); 858 VOP_CLOSE(pack.ep_vp, FREAD, cred, p); 859 vput(pack.ep_vp); 860 PNBUF_PUT(nid.ni_cnd.cn_pnbuf); 861 uvm_km_free_wakeup(exec_map, (vaddr_t) argp, NCARGS); 862 863 freehdr: 864 l->l_flag |= oldlwpflags; 865 p->p_flag &= ~P_INEXEC; 866 #ifdef LKM 867 lockmgr(&exec_lock, LK_RELEASE, NULL); 868 #endif 869 870 free(pack.ep_hdr, M_EXEC); 871 return error; 872 873 exec_abort: 874 p->p_flag &= ~P_INEXEC; 875 #ifdef LKM 876 lockmgr(&exec_lock, LK_RELEASE, NULL); 877 #endif 878 879 /* 880 * the old process doesn't exist anymore. exit gracefully. 881 * get rid of the (new) address space we have created, if any, get rid 882 * of our namei data and vnode, and exit noting failure 883 */ 884 uvm_deallocate(&vm->vm_map, VM_MIN_ADDRESS, 885 VM_MAXUSER_ADDRESS - VM_MIN_ADDRESS); 886 if (pack.ep_emul_arg) 887 FREE(pack.ep_emul_arg, M_TEMP); 888 PNBUF_PUT(nid.ni_cnd.cn_pnbuf); 889 uvm_km_free_wakeup(exec_map, (vaddr_t) argp, NCARGS); 890 free(pack.ep_hdr, M_EXEC); 891 exit1(l, W_EXITCODE(error, SIGABRT)); 892 893 /* NOTREACHED */ 894 return 0; 895 } 896 897 898 int 899 copyargs(struct proc *p, struct exec_package *pack, struct ps_strings *arginfo, 900 char **stackp, void *argp) 901 { 902 char **cpp, *dp, *sp; 903 size_t len; 904 void *nullp; 905 long argc, envc; 906 int error; 907 908 cpp = (char **)*stackp; 909 nullp = NULL; 910 argc = arginfo->ps_nargvstr; 911 envc = arginfo->ps_nenvstr; 912 if ((error = copyout(&argc, cpp++, sizeof(argc))) != 0) 913 return error; 914 915 dp = (char *) (cpp + argc + envc + 2 + pack->ep_es->es_arglen); 916 sp = argp; 917 918 /* XXX don't copy them out, remap them! */ 919 arginfo->ps_argvstr = cpp; /* remember location of argv for later */ 920 921 for (; --argc >= 0; sp += len, dp += len) 922 if ((error = copyout(&dp, cpp++, sizeof(dp))) != 0 || 923 (error = copyoutstr(sp, dp, ARG_MAX, &len)) != 0) 924 return error; 925 926 if ((error = copyout(&nullp, cpp++, sizeof(nullp))) != 0) 927 return error; 928 929 arginfo->ps_envstr = cpp; /* remember location of envp for later */ 930 931 for (; --envc >= 0; sp += len, dp += len) 932 if ((error = copyout(&dp, cpp++, sizeof(dp))) != 0 || 933 (error = copyoutstr(sp, dp, ARG_MAX, &len)) != 0) 934 return error; 935 936 if ((error = copyout(&nullp, cpp++, sizeof(nullp))) != 0) 937 return error; 938 939 *stackp = (char *)cpp; 940 return 0; 941 } 942 943 #ifdef LKM 944 /* 945 * Find an emulation of given name in list of emulations. 946 * Needs to be called with the exec_lock held. 947 */ 948 const struct emul * 949 emul_search(const char *name) 950 { 951 struct emul_entry *it; 952 953 LIST_FOREACH(it, &el_head, el_list) { 954 if (strcmp(name, it->el_emul->e_name) == 0) 955 return it->el_emul; 956 } 957 958 return NULL; 959 } 960 961 /* 962 * Add an emulation to list, if it's not there already. 963 */ 964 int 965 emul_register(const struct emul *emul, int ro_entry) 966 { 967 struct emul_entry *ee; 968 int error; 969 970 error = 0; 971 lockmgr(&exec_lock, LK_SHARED, NULL); 972 973 if (emul_search(emul->e_name)) { 974 error = EEXIST; 975 goto out; 976 } 977 978 MALLOC(ee, struct emul_entry *, sizeof(struct emul_entry), 979 M_EXEC, M_WAITOK); 980 ee->el_emul = emul; 981 ee->ro_entry = ro_entry; 982 LIST_INSERT_HEAD(&el_head, ee, el_list); 983 984 out: 985 lockmgr(&exec_lock, LK_RELEASE, NULL); 986 return error; 987 } 988 989 /* 990 * Remove emulation with name 'name' from list of supported emulations. 991 */ 992 int 993 emul_unregister(const char *name) 994 { 995 const struct proclist_desc *pd; 996 struct emul_entry *it; 997 int i, error; 998 struct proc *ptmp; 999 1000 error = 0; 1001 lockmgr(&exec_lock, LK_SHARED, NULL); 1002 1003 LIST_FOREACH(it, &el_head, el_list) { 1004 if (strcmp(it->el_emul->e_name, name) == 0) 1005 break; 1006 } 1007 1008 if (!it) { 1009 error = ENOENT; 1010 goto out; 1011 } 1012 1013 if (it->ro_entry) { 1014 error = EBUSY; 1015 goto out; 1016 } 1017 1018 /* test if any execw[] entry is still using this */ 1019 for(i=0; i < nexecs; i++) { 1020 if (execsw[i]->es_emul == it->el_emul) { 1021 error = EBUSY; 1022 goto out; 1023 } 1024 } 1025 1026 /* 1027 * Test if any process is running under this emulation - since 1028 * emul_unregister() is running quite sendomly, it's better 1029 * to do expensive check here than to use any locking. 1030 */ 1031 proclist_lock_read(); 1032 for (pd = proclists; pd->pd_list != NULL && !error; pd++) { 1033 PROCLIST_FOREACH(ptmp, pd->pd_list) { 1034 if (ptmp->p_emul == it->el_emul) { 1035 error = EBUSY; 1036 break; 1037 } 1038 } 1039 } 1040 proclist_unlock_read(); 1041 1042 if (error) 1043 goto out; 1044 1045 1046 /* entry is not used, remove it */ 1047 LIST_REMOVE(it, el_list); 1048 FREE(it, M_EXEC); 1049 1050 out: 1051 lockmgr(&exec_lock, LK_RELEASE, NULL); 1052 return error; 1053 } 1054 1055 /* 1056 * Add execsw[] entry. 1057 */ 1058 int 1059 exec_add(struct execsw *esp, const char *e_name) 1060 { 1061 struct exec_entry *it; 1062 int error; 1063 1064 error = 0; 1065 lockmgr(&exec_lock, LK_EXCLUSIVE, NULL); 1066 1067 if (!esp->es_emul) { 1068 esp->es_emul = emul_search(e_name); 1069 if (!esp->es_emul) { 1070 error = ENOENT; 1071 goto out; 1072 } 1073 } 1074 1075 LIST_FOREACH(it, &ex_head, ex_list) { 1076 /* assume tuple (makecmds, probe_func, emulation) is unique */ 1077 if (it->es->es_makecmds == esp->es_makecmds 1078 && it->es->u.elf_probe_func == esp->u.elf_probe_func 1079 && it->es->es_emul == esp->es_emul) { 1080 error = EEXIST; 1081 goto out; 1082 } 1083 } 1084 1085 /* if we got here, the entry doesn't exist yet */ 1086 MALLOC(it, struct exec_entry *, sizeof(struct exec_entry), 1087 M_EXEC, M_WAITOK); 1088 it->es = esp; 1089 LIST_INSERT_HEAD(&ex_head, it, ex_list); 1090 1091 /* update execsw[] */ 1092 exec_init(0); 1093 1094 out: 1095 lockmgr(&exec_lock, LK_RELEASE, NULL); 1096 return error; 1097 } 1098 1099 /* 1100 * Remove execsw[] entry. 1101 */ 1102 int 1103 exec_remove(const struct execsw *esp) 1104 { 1105 struct exec_entry *it; 1106 int error; 1107 1108 error = 0; 1109 lockmgr(&exec_lock, LK_EXCLUSIVE, NULL); 1110 1111 LIST_FOREACH(it, &ex_head, ex_list) { 1112 /* assume tuple (makecmds, probe_func, emulation) is unique */ 1113 if (it->es->es_makecmds == esp->es_makecmds 1114 && it->es->u.elf_probe_func == esp->u.elf_probe_func 1115 && it->es->es_emul == esp->es_emul) 1116 break; 1117 } 1118 if (!it) { 1119 error = ENOENT; 1120 goto out; 1121 } 1122 1123 /* remove item from list and free resources */ 1124 LIST_REMOVE(it, ex_list); 1125 FREE(it, M_EXEC); 1126 1127 /* update execsw[] */ 1128 exec_init(0); 1129 1130 out: 1131 lockmgr(&exec_lock, LK_RELEASE, NULL); 1132 return error; 1133 } 1134 1135 static void 1136 link_es(struct execsw_entry **listp, const struct execsw *esp) 1137 { 1138 struct execsw_entry *et, *e1; 1139 1140 MALLOC(et, struct execsw_entry *, sizeof(struct execsw_entry), 1141 M_TEMP, M_WAITOK); 1142 et->next = NULL; 1143 et->es = esp; 1144 if (*listp == NULL) { 1145 *listp = et; 1146 return; 1147 } 1148 1149 switch(et->es->es_prio) { 1150 case EXECSW_PRIO_FIRST: 1151 /* put new entry as the first */ 1152 et->next = *listp; 1153 *listp = et; 1154 break; 1155 case EXECSW_PRIO_ANY: 1156 /* put new entry after all *_FIRST and *_ANY entries */ 1157 for(e1 = *listp; e1->next 1158 && e1->next->es->es_prio != EXECSW_PRIO_LAST; 1159 e1 = e1->next); 1160 et->next = e1->next; 1161 e1->next = et; 1162 break; 1163 case EXECSW_PRIO_LAST: 1164 /* put new entry as the last one */ 1165 for(e1 = *listp; e1->next; e1 = e1->next); 1166 e1->next = et; 1167 break; 1168 default: 1169 #ifdef DIAGNOSTIC 1170 panic("execw[] entry with unknown priority %d found", 1171 et->es->es_prio); 1172 #endif 1173 break; 1174 } 1175 } 1176 1177 /* 1178 * Initialize exec structures. If init_boot is true, also does necessary 1179 * one-time initialization (it's called from main() that way). 1180 * Once system is multiuser, this should be called with exec_lock held, 1181 * i.e. via exec_{add|remove}(). 1182 */ 1183 int 1184 exec_init(int init_boot) 1185 { 1186 const struct execsw **new_es, * const *old_es; 1187 struct execsw_entry *list, *e1; 1188 struct exec_entry *e2; 1189 int i, es_sz; 1190 1191 if (init_boot) { 1192 /* do one-time initializations */ 1193 lockinit(&exec_lock, PWAIT, "execlck", 0, 0); 1194 1195 /* register compiled-in emulations */ 1196 for(i=0; i < nexecs_builtin; i++) { 1197 if (execsw_builtin[i].es_emul) 1198 emul_register(execsw_builtin[i].es_emul, 1); 1199 } 1200 #ifdef DIAGNOSTIC 1201 if (i == 0) 1202 panic("no emulations found in execsw_builtin[]"); 1203 #endif 1204 } 1205 1206 /* 1207 * Build execsw[] array from builtin entries and entries added 1208 * at runtime. 1209 */ 1210 list = NULL; 1211 for(i=0; i < nexecs_builtin; i++) 1212 link_es(&list, &execsw_builtin[i]); 1213 1214 /* Add dynamically loaded entries */ 1215 es_sz = nexecs_builtin; 1216 LIST_FOREACH(e2, &ex_head, ex_list) { 1217 link_es(&list, e2->es); 1218 es_sz++; 1219 } 1220 1221 /* 1222 * Now that we have sorted all execw entries, create new execsw[] 1223 * and free no longer needed memory in the process. 1224 */ 1225 new_es = malloc(es_sz * sizeof(struct execsw *), M_EXEC, M_WAITOK); 1226 for(i=0; list; i++) { 1227 new_es[i] = list->es; 1228 e1 = list->next; 1229 FREE(list, M_TEMP); 1230 list = e1; 1231 } 1232 1233 /* 1234 * New execsw[] array built, now replace old execsw[] and free 1235 * used memory. 1236 */ 1237 old_es = execsw; 1238 execsw = new_es; 1239 nexecs = es_sz; 1240 if (old_es) 1241 free((void *)old_es, M_EXEC); 1242 1243 /* 1244 * Figure out the maximum size of an exec header. 1245 */ 1246 exec_maxhdrsz = 0; 1247 for (i = 0; i < nexecs; i++) { 1248 if (execsw[i]->es_hdrsz > exec_maxhdrsz) 1249 exec_maxhdrsz = execsw[i]->es_hdrsz; 1250 } 1251 1252 return 0; 1253 } 1254 #endif 1255 1256 #ifndef LKM 1257 /* 1258 * Simplified exec_init() for kernels without LKMs. Only initialize 1259 * exec_maxhdrsz and execsw[]. 1260 */ 1261 int 1262 exec_init(int init_boot) 1263 { 1264 int i; 1265 1266 #ifdef DIAGNOSTIC 1267 if (!init_boot) 1268 panic("exec_init(): called with init_boot == 0"); 1269 #endif 1270 1271 /* do one-time initializations */ 1272 nexecs = nexecs_builtin; 1273 execsw = malloc(nexecs*sizeof(struct execsw *), M_EXEC, M_WAITOK); 1274 1275 /* 1276 * Fill in execsw[] and figure out the maximum size of an exec header. 1277 */ 1278 exec_maxhdrsz = 0; 1279 for(i=0; i < nexecs; i++) { 1280 execsw[i] = &execsw_builtin[i]; 1281 if (execsw_builtin[i].es_hdrsz > exec_maxhdrsz) 1282 exec_maxhdrsz = execsw_builtin[i].es_hdrsz; 1283 } 1284 1285 return 0; 1286 1287 } 1288 #endif /* !LKM */ 1289 1290 static int 1291 exec_sigcode_map(struct proc *p, const struct emul *e) 1292 { 1293 vaddr_t va; 1294 vsize_t sz; 1295 int error; 1296 struct uvm_object *uobj; 1297 1298 sz = (vaddr_t)e->e_esigcode - (vaddr_t)e->e_sigcode; 1299 1300 if (e->e_sigobject == NULL || sz == 0) { 1301 return 0; 1302 } 1303 1304 /* 1305 * If we don't have a sigobject for this emulation, create one. 1306 * 1307 * sigobject is an anonymous memory object (just like SYSV shared 1308 * memory) that we keep a permanent reference to and that we map 1309 * in all processes that need this sigcode. The creation is simple, 1310 * we create an object, add a permanent reference to it, map it in 1311 * kernel space, copy out the sigcode to it and unmap it. 1312 * We map it with PROT_READ|PROT_EXEC into the process just 1313 * the way sys_mmap() would map it. 1314 */ 1315 1316 uobj = *e->e_sigobject; 1317 if (uobj == NULL) { 1318 uobj = uao_create(sz, 0); 1319 (*uobj->pgops->pgo_reference)(uobj); 1320 va = vm_map_min(kernel_map); 1321 if ((error = uvm_map(kernel_map, &va, round_page(sz), 1322 uobj, 0, 0, 1323 UVM_MAPFLAG(UVM_PROT_RW, UVM_PROT_RW, 1324 UVM_INH_SHARE, UVM_ADV_RANDOM, 0)))) { 1325 printf("kernel mapping failed %d\n", error); 1326 (*uobj->pgops->pgo_detach)(uobj); 1327 return (error); 1328 } 1329 memcpy((void *)va, e->e_sigcode, sz); 1330 #ifdef PMAP_NEED_PROCWR 1331 pmap_procwr(&proc0, va, sz); 1332 #endif 1333 uvm_unmap(kernel_map, va, va + round_page(sz)); 1334 *e->e_sigobject = uobj; 1335 } 1336 1337 /* Just a hint to uvm_map where to put it. */ 1338 va = e->e_vm_default_addr(p, (vaddr_t)p->p_vmspace->vm_daddr, 1339 round_page(sz)); 1340 1341 #ifdef __alpha__ 1342 /* 1343 * Tru64 puts /sbin/loader at the end of user virtual memory, 1344 * which causes the above calculation to put the sigcode at 1345 * an invalid address. Put it just below the text instead. 1346 */ 1347 if (va == (vaddr_t)vm_map_max(&p->p_vmspace->vm_map)) { 1348 va = (vaddr_t)p->p_vmspace->vm_taddr - round_page(sz); 1349 } 1350 #endif 1351 1352 (*uobj->pgops->pgo_reference)(uobj); 1353 error = uvm_map(&p->p_vmspace->vm_map, &va, round_page(sz), 1354 uobj, 0, 0, 1355 UVM_MAPFLAG(UVM_PROT_RX, UVM_PROT_RX, UVM_INH_SHARE, 1356 UVM_ADV_RANDOM, 0)); 1357 if (error) { 1358 (*uobj->pgops->pgo_detach)(uobj); 1359 return (error); 1360 } 1361 p->p_sigctx.ps_sigcode = (void *)va; 1362 return (0); 1363 }
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