1 /* $NetBSD: kern_exec.c,v 1.201 2005/06/27 17:11:21 elad 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 1.201 2005/06/27 17:11:21 elad Exp $"); 37 38 #include "opt_ktrace.h" 39 #include "opt_syscall_debug.h" 40 #include "opt_compat_netbsd.h" 41 42 #include <sys/param.h> 43 #include <sys/systm.h> 44 #include <sys/filedesc.h> 45 #include <sys/kernel.h> 46 #include <sys/proc.h> 47 #include <sys/mount.h> 48 #include <sys/malloc.h> 49 #include <sys/namei.h> 50 #include <sys/vnode.h> 51 #include <sys/file.h> 52 #include <sys/acct.h> 53 #include <sys/exec.h> 54 #include <sys/ktrace.h> 55 #include <sys/resourcevar.h> 56 #include <sys/wait.h> 57 #include <sys/mman.h> 58 #include <sys/ras.h> 59 #include <sys/signalvar.h> 60 #include <sys/stat.h> 61 #include <sys/syscall.h> 62 63 #include <sys/sa.h> 64 #include <sys/savar.h> 65 #include <sys/syscallargs.h> 66 #ifdef VERIFIED_EXEC 67 #include <sys/verified_exec.h> 68 #endif 69 70 #ifdef SYSTRACE 71 #include <sys/systrace.h> 72 #endif /* SYSTRACE */ 73 74 #include <uvm/uvm_extern.h> 75 76 #include <machine/cpu.h> 77 #include <machine/reg.h> 78 79 static int exec_sigcode_map(struct proc *, const struct emul *); 80 81 #ifdef DEBUG_EXEC 82 #define DPRINTF(a) uprintf a 83 #else 84 #define DPRINTF(a) 85 #endif /* DEBUG_EXEC */ 86 87 MALLOC_DEFINE(M_EXEC, "exec", "argument lists & other mem used by exec"); 88 89 /* 90 * Exec function switch: 91 * 92 * Note that each makecmds function is responsible for loading the 93 * exec package with the necessary functions for any exec-type-specific 94 * handling. 95 * 96 * Functions for specific exec types should be defined in their own 97 * header file. 98 */ 99 extern const struct execsw execsw_builtin[]; 100 extern int nexecs_builtin; 101 static const struct execsw **execsw = NULL; 102 static int nexecs; 103 104 u_int exec_maxhdrsz; /* must not be static - netbsd32 needs it */ 105 106 #ifdef LKM 107 /* list of supported emulations */ 108 static 109 LIST_HEAD(emlist_head, emul_entry) el_head = LIST_HEAD_INITIALIZER(el_head); 110 struct emul_entry { 111 LIST_ENTRY(emul_entry) el_list; 112 const struct emul *el_emul; 113 int ro_entry; 114 }; 115 116 /* list of dynamically loaded execsw entries */ 117 static 118 LIST_HEAD(execlist_head, exec_entry) ex_head = LIST_HEAD_INITIALIZER(ex_head); 119 struct exec_entry { 120 LIST_ENTRY(exec_entry) ex_list; 121 const struct execsw *es; 122 }; 123 124 /* structure used for building execw[] */ 125 struct execsw_entry { 126 struct execsw_entry *next; 127 const struct execsw *es; 128 }; 129 #endif /* LKM */ 130 131 #ifdef SYSCALL_DEBUG 132 extern const char * const syscallnames[]; 133 #endif 134 #ifdef __HAVE_SYSCALL_INTERN 135 void syscall_intern(struct proc *); 136 #else 137 void syscall(void); 138 #endif 139 140 #ifdef COMPAT_16 141 extern char sigcode[], esigcode[]; 142 struct uvm_object *emul_netbsd_object; 143 #endif 144 145 /* NetBSD emul struct */ 146 const struct emul emul_netbsd = { 147 "netbsd", 148 NULL, /* emulation path */ 149 #ifndef __HAVE_MINIMAL_EMUL 150 EMUL_HAS_SYS___syscall, 151 NULL, 152 SYS_syscall, 153 SYS_NSYSENT, 154 #endif 155 sysent, 156 #ifdef SYSCALL_DEBUG 157 syscallnames, 158 #else 159 NULL, 160 #endif 161 sendsig, 162 trapsignal, 163 NULL, 164 #ifdef COMPAT_16 165 sigcode, 166 esigcode, 167 &emul_netbsd_object, 168 #else 169 NULL, 170 NULL, 171 NULL, 172 #endif 173 setregs, 174 NULL, 175 NULL, 176 NULL, 177 NULL, 178 NULL, 179 #ifdef __HAVE_SYSCALL_INTERN 180 syscall_intern, 181 #else 182 syscall, 183 #endif 184 NULL, 185 NULL, 186 187 uvm_default_mapaddr, 188 }; 189 190 #ifdef LKM 191 /* 192 * Exec lock. Used to control access to execsw[] structures. 193 * This must not be static so that netbsd32 can access it, too. 194 */ 195 struct lock exec_lock; 196 197 static void link_es(struct execsw_entry **, const struct execsw *); 198 #endif /* LKM */ 199 200 /* 201 * check exec: 202 * given an "executable" described in the exec package's namei info, 203 * see what we can do with it. 204 * 205 * ON ENTRY: 206 * exec package with appropriate namei info 207 * proc pointer of exec'ing proc 208 * if verified exec enabled then flag indicating a direct exec or 209 * an indirect exec (i.e. for a shell script interpreter) 210 * NO SELF-LOCKED VNODES 211 * 212 * ON EXIT: 213 * error: nothing held, etc. exec header still allocated. 214 * ok: filled exec package, executable's vnode (unlocked). 215 * 216 * EXEC SWITCH ENTRY: 217 * Locked vnode to check, exec package, proc. 218 * 219 * EXEC SWITCH EXIT: 220 * ok: return 0, filled exec package, executable's vnode (unlocked). 221 * error: destructive: 222 * everything deallocated execept exec header. 223 * non-destructive: 224 * error code, executable's vnode (unlocked), 225 * exec header unmodified. 226 */ 227 int 228 #ifdef VERIFIED_EXEC 229 check_exec(struct proc *p, struct exec_package *epp, int flag) 230 #else 231 check_exec(struct proc *p, struct exec_package *epp) 232 #endif 233 { 234 int error, i; 235 struct vnode *vp; 236 struct nameidata *ndp; 237 size_t resid; 238 239 ndp = epp->ep_ndp; 240 ndp->ni_cnd.cn_nameiop = LOOKUP; 241 ndp->ni_cnd.cn_flags = FOLLOW | LOCKLEAF | SAVENAME; 242 /* first get the vnode */ 243 if ((error = namei(ndp)) != 0) 244 return error; 245 epp->ep_vp = vp = ndp->ni_vp; 246 247 /* check access and type */ 248 if (vp->v_type != VREG) { 249 error = EACCES; 250 goto bad1; 251 } 252 if ((error = VOP_ACCESS(vp, VEXEC, p->p_ucred, p)) != 0) 253 goto bad1; 254 255 /* get attributes */ 256 if ((error = VOP_GETATTR(vp, epp->ep_vap, p->p_ucred, p)) != 0) 257 goto bad1; 258 259 /* Check mount point */ 260 if (vp->v_mount->mnt_flag & MNT_NOEXEC) { 261 error = EACCES; 262 goto bad1; 263 } 264 if (vp->v_mount->mnt_flag & MNT_NOSUID) 265 epp->ep_vap->va_mode &= ~(S_ISUID | S_ISGID); 266 267 /* try to open it */ 268 if ((error = VOP_OPEN(vp, FREAD, p->p_ucred, p)) != 0) 269 goto bad1; 270 271 /* unlock vp, since we need it unlocked from here on out. */ 272 VOP_UNLOCK(vp, 0); 273 274 275 #ifdef VERIFIED_EXEC 276 /* Evaluate signature for file... */ 277 if ((error = veriexec_verify(p, vp, epp->ep_vap, epp->ep_name, 278 flag, NULL)) != 0) 279 goto bad2; 280 #endif 281 282 /* now we have the file, get the exec header */ 283 uvn_attach(vp, VM_PROT_READ); 284 error = vn_rdwr(UIO_READ, vp, epp->ep_hdr, epp->ep_hdrlen, 0, 285 UIO_SYSSPACE, 0, p->p_ucred, &resid, NULL); 286 if (error) 287 goto bad2; 288 epp->ep_hdrvalid = epp->ep_hdrlen - resid; 289 290 /* 291 * Set up default address space limits. Can be overridden 292 * by individual exec packages. 293 * 294 * XXX probably should be all done in the exec pakages. 295 */ 296 epp->ep_vm_minaddr = VM_MIN_ADDRESS; 297 epp->ep_vm_maxaddr = VM_MAXUSER_ADDRESS; 298 /* 299 * set up the vmcmds for creation of the process 300 * address space 301 */ 302 error = ENOEXEC; 303 for (i = 0; i < nexecs && error != 0; i++) { 304 int newerror; 305 306 epp->ep_esch = execsw[i]; 307 newerror = (*execsw[i]->es_makecmds)(p, epp); 308 /* make sure the first "interesting" error code is saved. */ 309 if (!newerror || error == ENOEXEC) 310 error = newerror; 311 312 /* if es_makecmds call was successful, update epp->ep_es */ 313 if (!newerror && (epp->ep_flags & EXEC_HASES) == 0) 314 epp->ep_es = execsw[i]; 315 316 if (epp->ep_flags & EXEC_DESTR && error != 0) 317 return error; 318 } 319 if (!error) { 320 /* check that entry point is sane */ 321 if (epp->ep_entry > VM_MAXUSER_ADDRESS) 322 error = ENOEXEC; 323 324 /* check limits */ 325 if ((epp->ep_tsize > MAXTSIZ) || 326 (epp->ep_dsize > 327 (u_quad_t)p->p_rlimit[RLIMIT_DATA].rlim_cur)) 328 error = ENOMEM; 329 330 if (!error) 331 return (0); 332 } 333 334 /* 335 * free any vmspace-creation commands, 336 * and release their references 337 */ 338 kill_vmcmds(&epp->ep_vmcmds); 339 340 bad2: 341 /* 342 * close and release the vnode, restore the old one, free the 343 * pathname buf, and punt. 344 */ 345 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 346 VOP_CLOSE(vp, FREAD, p->p_ucred, p); 347 vput(vp); 348 PNBUF_PUT(ndp->ni_cnd.cn_pnbuf); 349 return error; 350 351 bad1: 352 /* 353 * free the namei pathname buffer, and put the vnode 354 * (which we don't yet have open). 355 */ 356 vput(vp); /* was still locked */ 357 PNBUF_PUT(ndp->ni_cnd.cn_pnbuf); 358 return error; 359 } 360 361 #ifdef __MACHINE_STACK_GROWS_UP 362 #define STACK_PTHREADSPACE NBPG 363 #else 364 #define STACK_PTHREADSPACE 0 365 #endif 366 367 /* 368 * exec system call 369 */ 370 /* ARGSUSED */ 371 int 372 sys_execve(struct lwp *l, void *v, register_t *retval) 373 { 374 struct sys_execve_args /* { 375 syscallarg(const char *) path; 376 syscallarg(char * const *) argp; 377 syscallarg(char * const *) envp; 378 } */ *uap = v; 379 int error; 380 u_int i; 381 struct exec_package pack; 382 struct nameidata nid; 383 struct vattr attr; 384 struct proc *p; 385 struct ucred *cred; 386 char *argp; 387 char * const *cpp; 388 char *dp, *sp; 389 long argc, envc; 390 size_t len; 391 char *stack; 392 struct ps_strings arginfo; 393 struct vmspace *vm; 394 char **tmpfap; 395 int szsigcode; 396 struct exec_vmcmd *base_vcp; 397 int oldlwpflags; 398 #ifdef SYSTRACE 399 int wassugid = ISSET(p->p_flag, P_SUGID); 400 char pathbuf[MAXPATHLEN]; 401 size_t pathbuflen; 402 #endif /* SYSTRACE */ 403 404 /* Disable scheduler activation upcalls. */ 405 oldlwpflags = l->l_flag & (L_SA | L_SA_UPCALL); 406 if (l->l_flag & L_SA) 407 l->l_flag &= ~(L_SA | L_SA_UPCALL); 408 409 p = l->l_proc; 410 /* 411 * Lock the process and set the P_INEXEC flag to indicate that 412 * it should be left alone until we're done here. This is 413 * necessary to avoid race conditions - e.g. in ptrace() - 414 * that might allow a local user to illicitly obtain elevated 415 * privileges. 416 */ 417 p->p_flag |= P_INEXEC; 418 419 cred = p->p_ucred; 420 base_vcp = NULL; 421 /* 422 * Init the namei data to point the file user's program name. 423 * This is done here rather than in check_exec(), so that it's 424 * possible to override this settings if any of makecmd/probe 425 * functions call check_exec() recursively - for example, 426 * see exec_script_makecmds(). 427 */ 428 #ifdef SYSTRACE 429 if (ISSET(p->p_flag, P_SYSTRACE)) 430 systrace_execve0(p); 431 432 error = copyinstr(SCARG(uap, path), pathbuf, sizeof(pathbuf), 433 &pathbuflen); 434 if (error) 435 goto clrflg; 436 437 NDINIT(&nid, LOOKUP, NOFOLLOW, UIO_SYSSPACE, pathbuf, p); 438 #else 439 NDINIT(&nid, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 440 #endif /* SYSTRACE */ 441 442 /* 443 * initialize the fields of the exec package. 444 */ 445 #ifdef SYSTRACE 446 pack.ep_name = pathbuf; 447 #else 448 pack.ep_name = SCARG(uap, path); 449 #endif /* SYSTRACE */ 450 pack.ep_hdr = malloc(exec_maxhdrsz, M_EXEC, M_WAITOK); 451 pack.ep_hdrlen = exec_maxhdrsz; 452 pack.ep_hdrvalid = 0; 453 pack.ep_ndp = &nid; 454 pack.ep_emul_arg = NULL; 455 pack.ep_vmcmds.evs_cnt = 0; 456 pack.ep_vmcmds.evs_used = 0; 457 pack.ep_vap = &attr; 458 pack.ep_flags = 0; 459 460 #ifdef LKM 461 lockmgr(&exec_lock, LK_SHARED, NULL); 462 #endif 463 464 /* see if we can run it. */ 465 #ifdef VERIFIED_EXEC 466 if ((error = check_exec(p, &pack, VERIEXEC_DIRECT)) != 0) 467 #else 468 if ((error = check_exec(p, &pack)) != 0) 469 #endif 470 goto freehdr; 471 472 /* XXX -- THE FOLLOWING SECTION NEEDS MAJOR CLEANUP */ 473 474 /* allocate an argument buffer */ 475 argp = (char *) uvm_km_alloc(exec_map, NCARGS, 0, 476 UVM_KMF_PAGEABLE|UVM_KMF_WAITVA); 477 #ifdef DIAGNOSTIC 478 if (argp == (vaddr_t) 0) 479 panic("execve: argp == NULL"); 480 #endif 481 dp = argp; 482 argc = 0; 483 484 /* copy the fake args list, if there's one, freeing it as we go */ 485 if (pack.ep_flags & EXEC_HASARGL) { 486 tmpfap = pack.ep_fa; 487 while (*tmpfap != NULL) { 488 char *cp; 489 490 cp = *tmpfap; 491 while (*cp) 492 *dp++ = *cp++; 493 dp++; 494 495 FREE(*tmpfap, M_EXEC); 496 tmpfap++; argc++; 497 } 498 FREE(pack.ep_fa, M_EXEC); 499 pack.ep_flags &= ~EXEC_HASARGL; 500 } 501 502 /* Now get argv & environment */ 503 if (!(cpp = SCARG(uap, argp))) { 504 error = EINVAL; 505 goto bad; 506 } 507 508 if (pack.ep_flags & EXEC_SKIPARG) 509 cpp++; 510 511 while (1) { 512 len = argp + ARG_MAX - dp; 513 if ((error = copyin(cpp, &sp, sizeof(sp))) != 0) 514 goto bad; 515 if (!sp) 516 break; 517 if ((error = copyinstr(sp, dp, len, &len)) != 0) { 518 if (error == ENAMETOOLONG) 519 error = E2BIG; 520 goto bad; 521 } 522 #ifdef KTRACE 523 if (KTRPOINT(p, KTR_EXEC_ARG)) 524 ktrkmem(p, KTR_EXEC_ARG, dp, len - 1); 525 #endif 526 dp += len; 527 cpp++; 528 argc++; 529 } 530 531 envc = 0; 532 /* environment need not be there */ 533 if ((cpp = SCARG(uap, envp)) != NULL ) { 534 while (1) { 535 len = argp + ARG_MAX - dp; 536 if ((error = copyin(cpp, &sp, sizeof(sp))) != 0) 537 goto bad; 538 if (!sp) 539 break; 540 if ((error = copyinstr(sp, dp, len, &len)) != 0) { 541 if (error == ENAMETOOLONG) 542 error = E2BIG; 543 goto bad; 544 } 545 #ifdef KTRACE 546 if (KTRPOINT(p, KTR_EXEC_ENV)) 547 ktrkmem(p, KTR_EXEC_ENV, dp, len - 1); 548 #endif 549 dp += len; 550 cpp++; 551 envc++; 552 } 553 } 554 555 dp = (char *) ALIGN(dp); 556 557 szsigcode = pack.ep_es->es_emul->e_esigcode - 558 pack.ep_es->es_emul->e_sigcode; 559 560 /* Now check if args & environ fit into new stack */ 561 if (pack.ep_flags & EXEC_32) 562 len = ((argc + envc + 2 + pack.ep_es->es_arglen) * 563 sizeof(int) + sizeof(int) + dp + STACKGAPLEN + 564 szsigcode + sizeof(struct ps_strings) + STACK_PTHREADSPACE) 565 - argp; 566 else 567 len = ((argc + envc + 2 + pack.ep_es->es_arglen) * 568 sizeof(char *) + sizeof(int) + dp + STACKGAPLEN + 569 szsigcode + sizeof(struct ps_strings) + STACK_PTHREADSPACE) 570 - argp; 571 572 len = ALIGN(len); /* make the stack "safely" aligned */ 573 574 if (len > pack.ep_ssize) { /* in effect, compare to initial limit */ 575 error = ENOMEM; 576 goto bad; 577 } 578 579 /* Get rid of other LWPs/ */ 580 p->p_flag |= P_WEXIT; /* XXX hack. lwp-exit stuff wants to see it. */ 581 exit_lwps(l); 582 p->p_flag &= ~P_WEXIT; 583 KDASSERT(p->p_nlwps == 1); 584 585 /* This is now LWP 1 */ 586 l->l_lid = 1; 587 p->p_nlwpid = 1; 588 589 /* Release any SA state. */ 590 if (p->p_sa) 591 sa_release(p); 592 593 /* Remove POSIX timers */ 594 timers_free(p, TIMERS_POSIX); 595 596 /* adjust "active stack depth" for process VSZ */ 597 pack.ep_ssize = len; /* maybe should go elsewhere, but... */ 598 599 /* 600 * Do whatever is necessary to prepare the address space 601 * for remapping. Note that this might replace the current 602 * vmspace with another! 603 */ 604 uvmspace_exec(l, pack.ep_vm_minaddr, pack.ep_vm_maxaddr); 605 606 /* record proc's vnode, for use by procfs and others */ 607 if (p->p_textvp) 608 vrele(p->p_textvp); 609 VREF(pack.ep_vp); 610 p->p_textvp = pack.ep_vp; 611 612 /* Now map address space */ 613 vm = p->p_vmspace; 614 vm->vm_taddr = (caddr_t) pack.ep_taddr; 615 vm->vm_tsize = btoc(pack.ep_tsize); 616 vm->vm_daddr = (caddr_t) pack.ep_daddr; 617 vm->vm_dsize = btoc(pack.ep_dsize); 618 vm->vm_ssize = btoc(pack.ep_ssize); 619 vm->vm_maxsaddr = (caddr_t) pack.ep_maxsaddr; 620 vm->vm_minsaddr = (caddr_t) pack.ep_minsaddr; 621 622 /* create the new process's VM space by running the vmcmds */ 623 #ifdef DIAGNOSTIC 624 if (pack.ep_vmcmds.evs_used == 0) 625 panic("execve: no vmcmds"); 626 #endif 627 for (i = 0; i < pack.ep_vmcmds.evs_used && !error; i++) { 628 struct exec_vmcmd *vcp; 629 630 vcp = &pack.ep_vmcmds.evs_cmds[i]; 631 if (vcp->ev_flags & VMCMD_RELATIVE) { 632 #ifdef DIAGNOSTIC 633 if (base_vcp == NULL) 634 panic("execve: relative vmcmd with no base"); 635 if (vcp->ev_flags & VMCMD_BASE) 636 panic("execve: illegal base & relative vmcmd"); 637 #endif 638 vcp->ev_addr += base_vcp->ev_addr; 639 } 640 error = (*vcp->ev_proc)(p, vcp); 641 #ifdef DEBUG_EXEC 642 if (error) { 643 int j; 644 struct exec_vmcmd *vp = &pack.ep_vmcmds.evs_cmds[0]; 645 for (j = 0; j <= i; j++) 646 uprintf( 647 "vmcmd[%d] = %#lx/%#lx fd@%#lx prot=0%o flags=%d\n", 648 j, vp[j].ev_addr, vp[j].ev_len, 649 vp[j].ev_offset, vp[j].ev_prot, 650 vp[j].ev_flags); 651 } 652 #endif /* DEBUG_EXEC */ 653 if (vcp->ev_flags & VMCMD_BASE) 654 base_vcp = vcp; 655 } 656 657 /* free the vmspace-creation commands, and release their references */ 658 kill_vmcmds(&pack.ep_vmcmds); 659 660 vn_lock(pack.ep_vp, LK_EXCLUSIVE | LK_RETRY); 661 VOP_CLOSE(pack.ep_vp, FREAD, cred, p); 662 vput(pack.ep_vp); 663 664 /* if an error happened, deallocate and punt */ 665 if (error) { 666 DPRINTF(("execve: vmcmd %i failed: %d\n", i - 1, error)); 667 goto exec_abort; 668 } 669 670 /* remember information about the process */ 671 arginfo.ps_nargvstr = argc; 672 arginfo.ps_nenvstr = envc; 673 674 stack = (char *)STACK_ALLOC(STACK_GROW(vm->vm_minsaddr, 675 STACK_PTHREADSPACE + sizeof(struct ps_strings) + szsigcode), 676 len - (sizeof(struct ps_strings) + szsigcode)); 677 #ifdef __MACHINE_STACK_GROWS_UP 678 /* 679 * The copyargs call always copies into lower addresses 680 * first, moving towards higher addresses, starting with 681 * the stack pointer that we give. When the stack grows 682 * down, this puts argc/argv/envp very shallow on the 683 * stack, right at the first user stack pointer, and puts 684 * STACKGAPLEN very deep in the stack. When the stack 685 * grows up, the situation is reversed. 686 * 687 * Normally, this is no big deal. But the ld_elf.so _rtld() 688 * function expects to be called with a single pointer to 689 * a region that has a few words it can stash values into, 690 * followed by argc/argv/envp. When the stack grows down, 691 * it's easy to decrement the stack pointer a little bit to 692 * allocate the space for these few words and pass the new 693 * stack pointer to _rtld. When the stack grows up, however, 694 * a few words before argc is part of the signal trampoline, XXX 695 * so we have a problem. 696 * 697 * Instead of changing how _rtld works, we take the easy way 698 * out and steal 32 bytes before we call copyargs. This 699 * space is effectively stolen from STACKGAPLEN. 700 */ 701 stack += 32; 702 #endif /* __MACHINE_STACK_GROWS_UP */ 703 704 /* Now copy argc, args & environ to new stack */ 705 error = (*pack.ep_es->es_copyargs)(p, &pack, &arginfo, &stack, argp); 706 if (error) { 707 DPRINTF(("execve: copyargs failed %d\n", error)); 708 goto exec_abort; 709 } 710 /* Move the stack back to original point */ 711 stack = (char *)STACK_GROW(vm->vm_minsaddr, len); 712 713 /* fill process ps_strings info */ 714 p->p_psstr = (struct ps_strings *) 715 STACK_ALLOC(STACK_GROW(vm->vm_minsaddr, STACK_PTHREADSPACE), 716 sizeof(struct ps_strings)); 717 p->p_psargv = offsetof(struct ps_strings, ps_argvstr); 718 p->p_psnargv = offsetof(struct ps_strings, ps_nargvstr); 719 p->p_psenv = offsetof(struct ps_strings, ps_envstr); 720 p->p_psnenv = offsetof(struct ps_strings, ps_nenvstr); 721 722 /* copy out the process's ps_strings structure */ 723 if ((error = copyout(&arginfo, (char *)p->p_psstr, 724 sizeof(arginfo))) != 0) { 725 DPRINTF(("execve: ps_strings copyout %p->%p size %ld failed\n", 726 &arginfo, (char *)p->p_psstr, (long)sizeof(arginfo))); 727 goto exec_abort; 728 } 729 730 stopprofclock(p); /* stop profiling */ 731 fdcloseexec(p); /* handle close on exec */ 732 execsigs(p); /* reset catched signals */ 733 734 l->l_ctxlink = NULL; /* reset ucontext link */ 735 736 /* set command name & other accounting info */ 737 len = min(nid.ni_cnd.cn_namelen, MAXCOMLEN); 738 memcpy(p->p_comm, nid.ni_cnd.cn_nameptr, len); 739 p->p_comm[len] = 0; 740 p->p_acflag &= ~AFORK; 741 742 p->p_flag |= P_EXEC; 743 if (p->p_flag & P_PPWAIT) { 744 p->p_flag &= ~P_PPWAIT; 745 wakeup((caddr_t) p->p_pptr); 746 } 747 748 /* 749 * deal with set[ug]id. 750 * MNT_NOSUID has already been used to disable s[ug]id. 751 */ 752 if ((p->p_flag & P_TRACED) == 0 && 753 754 (((attr.va_mode & S_ISUID) != 0 && 755 p->p_ucred->cr_uid != attr.va_uid) || 756 757 ((attr.va_mode & S_ISGID) != 0 && 758 p->p_ucred->cr_gid != attr.va_gid))) { 759 /* 760 * Mark the process as SUGID before we do 761 * anything that might block. 762 */ 763 p_sugid(p); 764 765 /* Make sure file descriptors 0..2 are in use. */ 766 if ((error = fdcheckstd(p)) != 0) 767 goto exec_abort; 768 769 p->p_ucred = crcopy(cred); 770 #ifdef KTRACE 771 /* 772 * If process is being ktraced, turn off - unless 773 * root set it. 774 */ 775 if (p->p_tracep && !(p->p_traceflag & KTRFAC_ROOT)) 776 ktrderef(p); 777 #endif 778 if (attr.va_mode & S_ISUID) 779 p->p_ucred->cr_uid = attr.va_uid; 780 if (attr.va_mode & S_ISGID) 781 p->p_ucred->cr_gid = attr.va_gid; 782 } else 783 p->p_flag &= ~P_SUGID; 784 p->p_cred->p_svuid = p->p_ucred->cr_uid; 785 p->p_cred->p_svgid = p->p_ucred->cr_gid; 786 787 #if defined(__HAVE_RAS) 788 /* 789 * Remove all RASs from the address space. 790 */ 791 ras_purgeall(p); 792 #endif 793 794 doexechooks(p); 795 796 uvm_km_free(exec_map, (vaddr_t) argp, NCARGS, UVM_KMF_PAGEABLE); 797 798 PNBUF_PUT(nid.ni_cnd.cn_pnbuf); 799 800 /* notify others that we exec'd */ 801 KNOTE(&p->p_klist, NOTE_EXEC); 802 803 /* setup new registers and do misc. setup. */ 804 (*pack.ep_es->es_emul->e_setregs)(l, &pack, (u_long) stack); 805 if (pack.ep_es->es_setregs) 806 (*pack.ep_es->es_setregs)(l, &pack, (u_long) stack); 807 808 /* map the process's signal trampoline code */ 809 if (exec_sigcode_map(p, pack.ep_es->es_emul)) 810 goto exec_abort; 811 812 if (p->p_flag & P_TRACED) 813 psignal(p, SIGTRAP); 814 815 free(pack.ep_hdr, M_EXEC); 816 817 /* 818 * Call emulation specific exec hook. This can setup per-process 819 * p->p_emuldata or do any other per-process stuff an emulation needs. 820 * 821 * If we are executing process of different emulation than the 822 * original forked process, call e_proc_exit() of the old emulation 823 * first, then e_proc_exec() of new emulation. If the emulation is 824 * same, the exec hook code should deallocate any old emulation 825 * resources held previously by this process. 826 */ 827 if (p->p_emul && p->p_emul->e_proc_exit 828 && p->p_emul != pack.ep_es->es_emul) 829 (*p->p_emul->e_proc_exit)(p); 830 831 /* 832 * Call exec hook. Emulation code may NOT store reference to anything 833 * from &pack. 834 */ 835 if (pack.ep_es->es_emul->e_proc_exec) 836 (*pack.ep_es->es_emul->e_proc_exec)(p, &pack); 837 838 /* update p_emul, the old value is no longer needed */ 839 p->p_emul = pack.ep_es->es_emul; 840 841 /* ...and the same for p_execsw */ 842 p->p_execsw = pack.ep_es; 843 844 #ifdef __HAVE_SYSCALL_INTERN 845 (*p->p_emul->e_syscall_intern)(p); 846 #endif 847 #ifdef KTRACE 848 if (KTRPOINT(p, KTR_EMUL)) 849 ktremul(p); 850 #endif 851 852 #ifdef LKM 853 lockmgr(&exec_lock, LK_RELEASE, NULL); 854 #endif 855 p->p_flag &= ~P_INEXEC; 856 857 if (p->p_flag & P_STOPEXEC) { 858 int s; 859 860 sigminusset(&contsigmask, &p->p_sigctx.ps_siglist); 861 SCHED_LOCK(s); 862 p->p_pptr->p_nstopchild++; 863 p->p_stat = SSTOP; 864 l->l_stat = LSSTOP; 865 p->p_nrlwps--; 866 mi_switch(l, NULL); 867 SCHED_ASSERT_UNLOCKED(); 868 splx(s); 869 } 870 871 #ifdef SYSTRACE 872 if (ISSET(p->p_flag, P_SYSTRACE) && 873 wassugid && !ISSET(p->p_flag, P_SUGID)) 874 systrace_execve1(pathbuf, p); 875 #endif /* SYSTRACE */ 876 877 return (EJUSTRETURN); 878 879 bad: 880 p->p_flag &= ~P_INEXEC; 881 /* free the vmspace-creation commands, and release their references */ 882 kill_vmcmds(&pack.ep_vmcmds); 883 /* kill any opened file descriptor, if necessary */ 884 if (pack.ep_flags & EXEC_HASFD) { 885 pack.ep_flags &= ~EXEC_HASFD; 886 (void) fdrelease(p, pack.ep_fd); 887 } 888 /* close and put the exec'd file */ 889 vn_lock(pack.ep_vp, LK_EXCLUSIVE | LK_RETRY); 890 VOP_CLOSE(pack.ep_vp, FREAD, cred, p); 891 vput(pack.ep_vp); 892 PNBUF_PUT(nid.ni_cnd.cn_pnbuf); 893 uvm_km_free(exec_map, (vaddr_t) argp, NCARGS, UVM_KMF_PAGEABLE); 894 895 freehdr: 896 free(pack.ep_hdr, M_EXEC); 897 898 #ifdef SYSTRACE 899 clrflg: 900 #endif /* SYSTRACE */ 901 l->l_flag |= oldlwpflags; 902 p->p_flag &= ~P_INEXEC; 903 #ifdef LKM 904 lockmgr(&exec_lock, LK_RELEASE, NULL); 905 #endif 906 907 return error; 908 909 exec_abort: 910 p->p_flag &= ~P_INEXEC; 911 #ifdef LKM 912 lockmgr(&exec_lock, LK_RELEASE, NULL); 913 #endif 914 915 /* 916 * the old process doesn't exist anymore. exit gracefully. 917 * get rid of the (new) address space we have created, if any, get rid 918 * of our namei data and vnode, and exit noting failure 919 */ 920 uvm_deallocate(&vm->vm_map, VM_MIN_ADDRESS, 921 VM_MAXUSER_ADDRESS - VM_MIN_ADDRESS); 922 if (pack.ep_emul_arg) 923 FREE(pack.ep_emul_arg, M_TEMP); 924 PNBUF_PUT(nid.ni_cnd.cn_pnbuf); 925 uvm_km_free(exec_map, (vaddr_t) argp, NCARGS, UVM_KMF_PAGEABLE); 926 free(pack.ep_hdr, M_EXEC); 927 exit1(l, W_EXITCODE(error, SIGABRT)); 928 929 /* NOTREACHED */ 930 return 0; 931 } 932 933 934 int 935 copyargs(struct proc *p, struct exec_package *pack, struct ps_strings *arginfo, 936 char **stackp, void *argp) 937 { 938 char **cpp, *dp, *sp; 939 size_t len; 940 void *nullp; 941 long argc, envc; 942 int error; 943 944 cpp = (char **)*stackp; 945 nullp = NULL; 946 argc = arginfo->ps_nargvstr; 947 envc = arginfo->ps_nenvstr; 948 if ((error = copyout(&argc, cpp++, sizeof(argc))) != 0) 949 return error; 950 951 dp = (char *) (cpp + argc + envc + 2 + pack->ep_es->es_arglen); 952 sp = argp; 953 954 /* XXX don't copy them out, remap them! */ 955 arginfo->ps_argvstr = cpp; /* remember location of argv for later */ 956 957 for (; --argc >= 0; sp += len, dp += len) 958 if ((error = copyout(&dp, cpp++, sizeof(dp))) != 0 || 959 (error = copyoutstr(sp, dp, ARG_MAX, &len)) != 0) 960 return error; 961 962 if ((error = copyout(&nullp, cpp++, sizeof(nullp))) != 0) 963 return error; 964 965 arginfo->ps_envstr = cpp; /* remember location of envp for later */ 966 967 for (; --envc >= 0; sp += len, dp += len) 968 if ((error = copyout(&dp, cpp++, sizeof(dp))) != 0 || 969 (error = copyoutstr(sp, dp, ARG_MAX, &len)) != 0) 970 return error; 971 972 if ((error = copyout(&nullp, cpp++, sizeof(nullp))) != 0) 973 return error; 974 975 *stackp = (char *)cpp; 976 return 0; 977 } 978 979 #ifdef LKM 980 /* 981 * Find an emulation of given name in list of emulations. 982 * Needs to be called with the exec_lock held. 983 */ 984 const struct emul * 985 emul_search(const char *name) 986 { 987 struct emul_entry *it; 988 989 LIST_FOREACH(it, &el_head, el_list) { 990 if (strcmp(name, it->el_emul->e_name) == 0) 991 return it->el_emul; 992 } 993 994 return NULL; 995 } 996 997 /* 998 * Add an emulation to list, if it's not there already. 999 */ 1000 int 1001 emul_register(const struct emul *emul, int ro_entry) 1002 { 1003 struct emul_entry *ee; 1004 int error; 1005 1006 error = 0; 1007 lockmgr(&exec_lock, LK_SHARED, NULL); 1008 1009 if (emul_search(emul->e_name)) { 1010 error = EEXIST; 1011 goto out; 1012 } 1013 1014 MALLOC(ee, struct emul_entry *, sizeof(struct emul_entry), 1015 M_EXEC, M_WAITOK); 1016 ee->el_emul = emul; 1017 ee->ro_entry = ro_entry; 1018 LIST_INSERT_HEAD(&el_head, ee, el_list); 1019 1020 out: 1021 lockmgr(&exec_lock, LK_RELEASE, NULL); 1022 return error; 1023 } 1024 1025 /* 1026 * Remove emulation with name 'name' from list of supported emulations. 1027 */ 1028 int 1029 emul_unregister(const char *name) 1030 { 1031 const struct proclist_desc *pd; 1032 struct emul_entry *it; 1033 int i, error; 1034 struct proc *ptmp; 1035 1036 error = 0; 1037 lockmgr(&exec_lock, LK_SHARED, NULL); 1038 1039 LIST_FOREACH(it, &el_head, el_list) { 1040 if (strcmp(it->el_emul->e_name, name) == 0) 1041 break; 1042 } 1043 1044 if (!it) { 1045 error = ENOENT; 1046 goto out; 1047 } 1048 1049 if (it->ro_entry) { 1050 error = EBUSY; 1051 goto out; 1052 } 1053 1054 /* test if any execw[] entry is still using this */ 1055 for(i=0; i < nexecs; i++) { 1056 if (execsw[i]->es_emul == it->el_emul) { 1057 error = EBUSY; 1058 goto out; 1059 } 1060 } 1061 1062 /* 1063 * Test if any process is running under this emulation - since 1064 * emul_unregister() is running quite sendomly, it's better 1065 * to do expensive check here than to use any locking. 1066 */ 1067 proclist_lock_read(); 1068 for (pd = proclists; pd->pd_list != NULL && !error; pd++) { 1069 PROCLIST_FOREACH(ptmp, pd->pd_list) { 1070 if (ptmp->p_emul == it->el_emul) { 1071 error = EBUSY; 1072 break; 1073 } 1074 } 1075 } 1076 proclist_unlock_read(); 1077 1078 if (error) 1079 goto out; 1080 1081 1082 /* entry is not used, remove it */ 1083 LIST_REMOVE(it, el_list); 1084 FREE(it, M_EXEC); 1085 1086 out: 1087 lockmgr(&exec_lock, LK_RELEASE, NULL); 1088 return error; 1089 } 1090 1091 /* 1092 * Add execsw[] entry. 1093 */ 1094 int 1095 exec_add(struct execsw *esp, const char *e_name) 1096 { 1097 struct exec_entry *it; 1098 int error; 1099 1100 error = 0; 1101 lockmgr(&exec_lock, LK_EXCLUSIVE, NULL); 1102 1103 if (!esp->es_emul) { 1104 esp->es_emul = emul_search(e_name); 1105 if (!esp->es_emul) { 1106 error = ENOENT; 1107 goto out; 1108 } 1109 } 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 error = EEXIST; 1117 goto out; 1118 } 1119 } 1120 1121 /* if we got here, the entry doesn't exist yet */ 1122 MALLOC(it, struct exec_entry *, sizeof(struct exec_entry), 1123 M_EXEC, M_WAITOK); 1124 it->es = esp; 1125 LIST_INSERT_HEAD(&ex_head, it, ex_list); 1126 1127 /* update execsw[] */ 1128 exec_init(0); 1129 1130 out: 1131 lockmgr(&exec_lock, LK_RELEASE, NULL); 1132 return error; 1133 } 1134 1135 /* 1136 * Remove execsw[] entry. 1137 */ 1138 int 1139 exec_remove(const struct execsw *esp) 1140 { 1141 struct exec_entry *it; 1142 int error; 1143 1144 error = 0; 1145 lockmgr(&exec_lock, LK_EXCLUSIVE, NULL); 1146 1147 LIST_FOREACH(it, &ex_head, ex_list) { 1148 /* assume tuple (makecmds, probe_func, emulation) is unique */ 1149 if (it->es->es_makecmds == esp->es_makecmds 1150 && it->es->u.elf_probe_func == esp->u.elf_probe_func 1151 && it->es->es_emul == esp->es_emul) 1152 break; 1153 } 1154 if (!it) { 1155 error = ENOENT; 1156 goto out; 1157 } 1158 1159 /* remove item from list and free resources */ 1160 LIST_REMOVE(it, ex_list); 1161 FREE(it, M_EXEC); 1162 1163 /* update execsw[] */ 1164 exec_init(0); 1165 1166 out: 1167 lockmgr(&exec_lock, LK_RELEASE, NULL); 1168 return error; 1169 } 1170 1171 static void 1172 link_es(struct execsw_entry **listp, const struct execsw *esp) 1173 { 1174 struct execsw_entry *et, *e1; 1175 1176 MALLOC(et, struct execsw_entry *, sizeof(struct execsw_entry), 1177 M_TEMP, M_WAITOK); 1178 et->next = NULL; 1179 et->es = esp; 1180 if (*listp == NULL) { 1181 *listp = et; 1182 return; 1183 } 1184 1185 switch(et->es->es_prio) { 1186 case EXECSW_PRIO_FIRST: 1187 /* put new entry as the first */ 1188 et->next = *listp; 1189 *listp = et; 1190 break; 1191 case EXECSW_PRIO_ANY: 1192 /* put new entry after all *_FIRST and *_ANY entries */ 1193 for(e1 = *listp; e1->next 1194 && e1->next->es->es_prio != EXECSW_PRIO_LAST; 1195 e1 = e1->next); 1196 et->next = e1->next; 1197 e1->next = et; 1198 break; 1199 case EXECSW_PRIO_LAST: 1200 /* put new entry as the last one */ 1201 for(e1 = *listp; e1->next; e1 = e1->next); 1202 e1->next = et; 1203 break; 1204 default: 1205 #ifdef DIAGNOSTIC 1206 panic("execw[] entry with unknown priority %d found", 1207 et->es->es_prio); 1208 #endif 1209 break; 1210 } 1211 } 1212 1213 /* 1214 * Initialize exec structures. If init_boot is true, also does necessary 1215 * one-time initialization (it's called from main() that way). 1216 * Once system is multiuser, this should be called with exec_lock held, 1217 * i.e. via exec_{add|remove}(). 1218 */ 1219 int 1220 exec_init(int init_boot) 1221 { 1222 const struct execsw **new_es, * const *old_es; 1223 struct execsw_entry *list, *e1; 1224 struct exec_entry *e2; 1225 int i, es_sz; 1226 1227 if (init_boot) { 1228 /* do one-time initializations */ 1229 lockinit(&exec_lock, PWAIT, "execlck", 0, 0); 1230 1231 /* register compiled-in emulations */ 1232 for(i=0; i < nexecs_builtin; i++) { 1233 if (execsw_builtin[i].es_emul) 1234 emul_register(execsw_builtin[i].es_emul, 1); 1235 } 1236 #ifdef DIAGNOSTIC 1237 if (i == 0) 1238 panic("no emulations found in execsw_builtin[]"); 1239 #endif 1240 } 1241 1242 /* 1243 * Build execsw[] array from builtin entries and entries added 1244 * at runtime. 1245 */ 1246 list = NULL; 1247 for(i=0; i < nexecs_builtin; i++) 1248 link_es(&list, &execsw_builtin[i]); 1249 1250 /* Add dynamically loaded entries */ 1251 es_sz = nexecs_builtin; 1252 LIST_FOREACH(e2, &ex_head, ex_list) { 1253 link_es(&list, e2->es); 1254 es_sz++; 1255 } 1256 1257 /* 1258 * Now that we have sorted all execw entries, create new execsw[] 1259 * and free no longer needed memory in the process. 1260 */ 1261 new_es = malloc(es_sz * sizeof(struct execsw *), M_EXEC, M_WAITOK); 1262 for(i=0; list; i++) { 1263 new_es[i] = list->es; 1264 e1 = list->next; 1265 FREE(list, M_TEMP); 1266 list = e1; 1267 } 1268 1269 /* 1270 * New execsw[] array built, now replace old execsw[] and free 1271 * used memory. 1272 */ 1273 old_es = execsw; 1274 execsw = new_es; 1275 nexecs = es_sz; 1276 if (old_es) 1277 /*XXXUNCONST*/ 1278 free(__UNCONST(old_es), M_EXEC); 1279 1280 /* 1281 * Figure out the maximum size of an exec header. 1282 */ 1283 exec_maxhdrsz = 0; 1284 for (i = 0; i < nexecs; i++) { 1285 if (execsw[i]->es_hdrsz > exec_maxhdrsz) 1286 exec_maxhdrsz = execsw[i]->es_hdrsz; 1287 } 1288 1289 return 0; 1290 } 1291 #endif 1292 1293 #ifndef LKM 1294 /* 1295 * Simplified exec_init() for kernels without LKMs. Only initialize 1296 * exec_maxhdrsz and execsw[]. 1297 */ 1298 int 1299 exec_init(int init_boot) 1300 { 1301 int i; 1302 1303 #ifdef DIAGNOSTIC 1304 if (!init_boot) 1305 panic("exec_init(): called with init_boot == 0"); 1306 #endif 1307 1308 /* do one-time initializations */ 1309 nexecs = nexecs_builtin; 1310 execsw = malloc(nexecs*sizeof(struct execsw *), M_EXEC, M_WAITOK); 1311 1312 /* 1313 * Fill in execsw[] and figure out the maximum size of an exec header. 1314 */ 1315 exec_maxhdrsz = 0; 1316 for(i=0; i < nexecs; i++) { 1317 execsw[i] = &execsw_builtin[i]; 1318 if (execsw_builtin[i].es_hdrsz > exec_maxhdrsz) 1319 exec_maxhdrsz = execsw_builtin[i].es_hdrsz; 1320 } 1321 1322 return 0; 1323 1324 } 1325 #endif /* !LKM */ 1326 1327 static int 1328 exec_sigcode_map(struct proc *p, const struct emul *e) 1329 { 1330 vaddr_t va; 1331 vsize_t sz; 1332 int error; 1333 struct uvm_object *uobj; 1334 1335 sz = (vaddr_t)e->e_esigcode - (vaddr_t)e->e_sigcode; 1336 1337 if (e->e_sigobject == NULL || sz == 0) { 1338 return 0; 1339 } 1340 1341 /* 1342 * If we don't have a sigobject for this emulation, create one. 1343 * 1344 * sigobject is an anonymous memory object (just like SYSV shared 1345 * memory) that we keep a permanent reference to and that we map 1346 * in all processes that need this sigcode. The creation is simple, 1347 * we create an object, add a permanent reference to it, map it in 1348 * kernel space, copy out the sigcode to it and unmap it. 1349 * We map it with PROT_READ|PROT_EXEC into the process just 1350 * the way sys_mmap() would map it. 1351 */ 1352 1353 uobj = *e->e_sigobject; 1354 if (uobj == NULL) { 1355 uobj = uao_create(sz, 0); 1356 (*uobj->pgops->pgo_reference)(uobj); 1357 va = vm_map_min(kernel_map); 1358 if ((error = uvm_map(kernel_map, &va, round_page(sz), 1359 uobj, 0, 0, 1360 UVM_MAPFLAG(UVM_PROT_RW, UVM_PROT_RW, 1361 UVM_INH_SHARE, UVM_ADV_RANDOM, 0)))) { 1362 printf("kernel mapping failed %d\n", error); 1363 (*uobj->pgops->pgo_detach)(uobj); 1364 return (error); 1365 } 1366 memcpy((void *)va, e->e_sigcode, sz); 1367 #ifdef PMAP_NEED_PROCWR 1368 pmap_procwr(&proc0, va, sz); 1369 #endif 1370 uvm_unmap(kernel_map, va, va + round_page(sz)); 1371 *e->e_sigobject = uobj; 1372 } 1373 1374 /* Just a hint to uvm_map where to put it. */ 1375 va = e->e_vm_default_addr(p, (vaddr_t)p->p_vmspace->vm_daddr, 1376 round_page(sz)); 1377 1378 #ifdef __alpha__ 1379 /* 1380 * Tru64 puts /sbin/loader at the end of user virtual memory, 1381 * which causes the above calculation to put the sigcode at 1382 * an invalid address. Put it just below the text instead. 1383 */ 1384 if (va == (vaddr_t)vm_map_max(&p->p_vmspace->vm_map)) { 1385 va = (vaddr_t)p->p_vmspace->vm_taddr - round_page(sz); 1386 } 1387 #endif 1388 1389 (*uobj->pgops->pgo_reference)(uobj); 1390 error = uvm_map(&p->p_vmspace->vm_map, &va, round_page(sz), 1391 uobj, 0, 0, 1392 UVM_MAPFLAG(UVM_PROT_RX, UVM_PROT_RX, UVM_INH_SHARE, 1393 UVM_ADV_RANDOM, 0)); 1394 if (error) { 1395 (*uobj->pgops->pgo_detach)(uobj); 1396 return (error); 1397 } 1398 p->p_sigctx.ps_sigcode = (void *)va; 1399 return (0); 1400 } 1401