kern_exec.c revision 1.200
1 /* $NetBSD: kern_exec.c,v 1.200 2005/06/26 19:58:29 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 1.200 2005/06/26 19:58:29 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 error = copyinstr(SCARG(uap, path), pathbuf, sizeof(pathbuf), 430 &pathbuflen); 431 if (error) 432 goto clrflg; 433 434 NDINIT(&nid, LOOKUP, NOFOLLOW, UIO_SYSSPACE, pathbuf, p); 435 #else 436 NDINIT(&nid, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 437 #endif /* SYSTRACE */ 438 439 /* 440 * initialize the fields of the exec package. 441 */ 442 #ifdef SYSTRACE 443 pack.ep_name = pathbuf; 444 #else 445 pack.ep_name = SCARG(uap, path); 446 #endif /* SYSTRACE */ 447 pack.ep_hdr = malloc(exec_maxhdrsz, M_EXEC, M_WAITOK); 448 pack.ep_hdrlen = exec_maxhdrsz; 449 pack.ep_hdrvalid = 0; 450 pack.ep_ndp = &nid; 451 pack.ep_emul_arg = NULL; 452 pack.ep_vmcmds.evs_cnt = 0; 453 pack.ep_vmcmds.evs_used = 0; 454 pack.ep_vap = &attr; 455 pack.ep_flags = 0; 456 457 #ifdef LKM 458 lockmgr(&exec_lock, LK_SHARED, NULL); 459 #endif 460 461 /* see if we can run it. */ 462 #ifdef VERIFIED_EXEC 463 if ((error = check_exec(p, &pack, VERIEXEC_DIRECT)) != 0) 464 #else 465 if ((error = check_exec(p, &pack)) != 0) 466 #endif 467 goto freehdr; 468 469 /* XXX -- THE FOLLOWING SECTION NEEDS MAJOR CLEANUP */ 470 471 /* allocate an argument buffer */ 472 argp = (char *) uvm_km_alloc(exec_map, NCARGS, 0, 473 UVM_KMF_PAGEABLE|UVM_KMF_WAITVA); 474 #ifdef DIAGNOSTIC 475 if (argp == (vaddr_t) 0) 476 panic("execve: argp == NULL"); 477 #endif 478 dp = argp; 479 argc = 0; 480 481 /* copy the fake args list, if there's one, freeing it as we go */ 482 if (pack.ep_flags & EXEC_HASARGL) { 483 tmpfap = pack.ep_fa; 484 while (*tmpfap != NULL) { 485 char *cp; 486 487 cp = *tmpfap; 488 while (*cp) 489 *dp++ = *cp++; 490 dp++; 491 492 FREE(*tmpfap, M_EXEC); 493 tmpfap++; argc++; 494 } 495 FREE(pack.ep_fa, M_EXEC); 496 pack.ep_flags &= ~EXEC_HASARGL; 497 } 498 499 /* Now get argv & environment */ 500 if (!(cpp = SCARG(uap, argp))) { 501 error = EINVAL; 502 goto bad; 503 } 504 505 if (pack.ep_flags & EXEC_SKIPARG) 506 cpp++; 507 508 while (1) { 509 len = argp + ARG_MAX - dp; 510 if ((error = copyin(cpp, &sp, sizeof(sp))) != 0) 511 goto bad; 512 if (!sp) 513 break; 514 if ((error = copyinstr(sp, dp, len, &len)) != 0) { 515 if (error == ENAMETOOLONG) 516 error = E2BIG; 517 goto bad; 518 } 519 #ifdef KTRACE 520 if (KTRPOINT(p, KTR_EXEC_ARG)) 521 ktrkmem(p, KTR_EXEC_ARG, dp, len - 1); 522 #endif 523 dp += len; 524 cpp++; 525 argc++; 526 } 527 528 envc = 0; 529 /* environment need not be there */ 530 if ((cpp = SCARG(uap, envp)) != NULL ) { 531 while (1) { 532 len = argp + ARG_MAX - dp; 533 if ((error = copyin(cpp, &sp, sizeof(sp))) != 0) 534 goto bad; 535 if (!sp) 536 break; 537 if ((error = copyinstr(sp, dp, len, &len)) != 0) { 538 if (error == ENAMETOOLONG) 539 error = E2BIG; 540 goto bad; 541 } 542 #ifdef KTRACE 543 if (KTRPOINT(p, KTR_EXEC_ENV)) 544 ktrkmem(p, KTR_EXEC_ENV, dp, len - 1); 545 #endif 546 dp += len; 547 cpp++; 548 envc++; 549 } 550 } 551 552 dp = (char *) ALIGN(dp); 553 554 szsigcode = pack.ep_es->es_emul->e_esigcode - 555 pack.ep_es->es_emul->e_sigcode; 556 557 /* Now check if args & environ fit into new stack */ 558 if (pack.ep_flags & EXEC_32) 559 len = ((argc + envc + 2 + pack.ep_es->es_arglen) * 560 sizeof(int) + sizeof(int) + dp + STACKGAPLEN + 561 szsigcode + sizeof(struct ps_strings) + STACK_PTHREADSPACE) 562 - argp; 563 else 564 len = ((argc + envc + 2 + pack.ep_es->es_arglen) * 565 sizeof(char *) + sizeof(int) + dp + STACKGAPLEN + 566 szsigcode + sizeof(struct ps_strings) + STACK_PTHREADSPACE) 567 - argp; 568 569 len = ALIGN(len); /* make the stack "safely" aligned */ 570 571 if (len > pack.ep_ssize) { /* in effect, compare to initial limit */ 572 error = ENOMEM; 573 goto bad; 574 } 575 576 /* Get rid of other LWPs/ */ 577 p->p_flag |= P_WEXIT; /* XXX hack. lwp-exit stuff wants to see it. */ 578 exit_lwps(l); 579 p->p_flag &= ~P_WEXIT; 580 KDASSERT(p->p_nlwps == 1); 581 582 /* This is now LWP 1 */ 583 l->l_lid = 1; 584 p->p_nlwpid = 1; 585 586 /* Release any SA state. */ 587 if (p->p_sa) 588 sa_release(p); 589 590 /* Remove POSIX timers */ 591 timers_free(p, TIMERS_POSIX); 592 593 /* adjust "active stack depth" for process VSZ */ 594 pack.ep_ssize = len; /* maybe should go elsewhere, but... */ 595 596 /* 597 * Do whatever is necessary to prepare the address space 598 * for remapping. Note that this might replace the current 599 * vmspace with another! 600 */ 601 uvmspace_exec(l, pack.ep_vm_minaddr, pack.ep_vm_maxaddr); 602 603 /* record proc's vnode, for use by procfs and others */ 604 if (p->p_textvp) 605 vrele(p->p_textvp); 606 VREF(pack.ep_vp); 607 p->p_textvp = pack.ep_vp; 608 609 /* Now map address space */ 610 vm = p->p_vmspace; 611 vm->vm_taddr = (caddr_t) pack.ep_taddr; 612 vm->vm_tsize = btoc(pack.ep_tsize); 613 vm->vm_daddr = (caddr_t) pack.ep_daddr; 614 vm->vm_dsize = btoc(pack.ep_dsize); 615 vm->vm_ssize = btoc(pack.ep_ssize); 616 vm->vm_maxsaddr = (caddr_t) pack.ep_maxsaddr; 617 vm->vm_minsaddr = (caddr_t) pack.ep_minsaddr; 618 619 /* create the new process's VM space by running the vmcmds */ 620 #ifdef DIAGNOSTIC 621 if (pack.ep_vmcmds.evs_used == 0) 622 panic("execve: no vmcmds"); 623 #endif 624 for (i = 0; i < pack.ep_vmcmds.evs_used && !error; i++) { 625 struct exec_vmcmd *vcp; 626 627 vcp = &pack.ep_vmcmds.evs_cmds[i]; 628 if (vcp->ev_flags & VMCMD_RELATIVE) { 629 #ifdef DIAGNOSTIC 630 if (base_vcp == NULL) 631 panic("execve: relative vmcmd with no base"); 632 if (vcp->ev_flags & VMCMD_BASE) 633 panic("execve: illegal base & relative vmcmd"); 634 #endif 635 vcp->ev_addr += base_vcp->ev_addr; 636 } 637 error = (*vcp->ev_proc)(p, vcp); 638 #ifdef DEBUG_EXEC 639 if (error) { 640 int j; 641 struct exec_vmcmd *vp = &pack.ep_vmcmds.evs_cmds[0]; 642 for (j = 0; j <= i; j++) 643 uprintf( 644 "vmcmd[%d] = %#lx/%#lx fd@%#lx prot=0%o flags=%d\n", 645 j, vp[j].ev_addr, vp[j].ev_len, 646 vp[j].ev_offset, vp[j].ev_prot, 647 vp[j].ev_flags); 648 } 649 #endif /* DEBUG_EXEC */ 650 if (vcp->ev_flags & VMCMD_BASE) 651 base_vcp = vcp; 652 } 653 654 /* free the vmspace-creation commands, and release their references */ 655 kill_vmcmds(&pack.ep_vmcmds); 656 657 vn_lock(pack.ep_vp, LK_EXCLUSIVE | LK_RETRY); 658 VOP_CLOSE(pack.ep_vp, FREAD, cred, p); 659 vput(pack.ep_vp); 660 661 /* if an error happened, deallocate and punt */ 662 if (error) { 663 DPRINTF(("execve: vmcmd %i failed: %d\n", i - 1, error)); 664 goto exec_abort; 665 } 666 667 /* remember information about the process */ 668 arginfo.ps_nargvstr = argc; 669 arginfo.ps_nenvstr = envc; 670 671 stack = (char *)STACK_ALLOC(STACK_GROW(vm->vm_minsaddr, 672 STACK_PTHREADSPACE + sizeof(struct ps_strings) + szsigcode), 673 len - (sizeof(struct ps_strings) + szsigcode)); 674 #ifdef __MACHINE_STACK_GROWS_UP 675 /* 676 * The copyargs call always copies into lower addresses 677 * first, moving towards higher addresses, starting with 678 * the stack pointer that we give. When the stack grows 679 * down, this puts argc/argv/envp very shallow on the 680 * stack, right at the first user stack pointer, and puts 681 * STACKGAPLEN very deep in the stack. When the stack 682 * grows up, the situation is reversed. 683 * 684 * Normally, this is no big deal. But the ld_elf.so _rtld() 685 * function expects to be called with a single pointer to 686 * a region that has a few words it can stash values into, 687 * followed by argc/argv/envp. When the stack grows down, 688 * it's easy to decrement the stack pointer a little bit to 689 * allocate the space for these few words and pass the new 690 * stack pointer to _rtld. When the stack grows up, however, 691 * a few words before argc is part of the signal trampoline, XXX 692 * so we have a problem. 693 * 694 * Instead of changing how _rtld works, we take the easy way 695 * out and steal 32 bytes before we call copyargs. This 696 * space is effectively stolen from STACKGAPLEN. 697 */ 698 stack += 32; 699 #endif /* __MACHINE_STACK_GROWS_UP */ 700 701 /* Now copy argc, args & environ to new stack */ 702 error = (*pack.ep_es->es_copyargs)(p, &pack, &arginfo, &stack, argp); 703 if (error) { 704 DPRINTF(("execve: copyargs failed %d\n", error)); 705 goto exec_abort; 706 } 707 /* Move the stack back to original point */ 708 stack = (char *)STACK_GROW(vm->vm_minsaddr, len); 709 710 /* fill process ps_strings info */ 711 p->p_psstr = (struct ps_strings *) 712 STACK_ALLOC(STACK_GROW(vm->vm_minsaddr, STACK_PTHREADSPACE), 713 sizeof(struct ps_strings)); 714 p->p_psargv = offsetof(struct ps_strings, ps_argvstr); 715 p->p_psnargv = offsetof(struct ps_strings, ps_nargvstr); 716 p->p_psenv = offsetof(struct ps_strings, ps_envstr); 717 p->p_psnenv = offsetof(struct ps_strings, ps_nenvstr); 718 719 /* copy out the process's ps_strings structure */ 720 if ((error = copyout(&arginfo, (char *)p->p_psstr, 721 sizeof(arginfo))) != 0) { 722 DPRINTF(("execve: ps_strings copyout %p->%p size %ld failed\n", 723 &arginfo, (char *)p->p_psstr, (long)sizeof(arginfo))); 724 goto exec_abort; 725 } 726 727 stopprofclock(p); /* stop profiling */ 728 fdcloseexec(p); /* handle close on exec */ 729 execsigs(p); /* reset catched signals */ 730 731 l->l_ctxlink = NULL; /* reset ucontext link */ 732 733 /* set command name & other accounting info */ 734 len = min(nid.ni_cnd.cn_namelen, MAXCOMLEN); 735 memcpy(p->p_comm, nid.ni_cnd.cn_nameptr, len); 736 p->p_comm[len] = 0; 737 p->p_acflag &= ~AFORK; 738 739 p->p_flag |= P_EXEC; 740 if (p->p_flag & P_PPWAIT) { 741 p->p_flag &= ~P_PPWAIT; 742 wakeup((caddr_t) p->p_pptr); 743 } 744 745 /* 746 * deal with set[ug]id. 747 * MNT_NOSUID has already been used to disable s[ug]id. 748 */ 749 if ((p->p_flag & P_TRACED) == 0 && 750 751 (((attr.va_mode & S_ISUID) != 0 && 752 p->p_ucred->cr_uid != attr.va_uid) || 753 754 ((attr.va_mode & S_ISGID) != 0 && 755 p->p_ucred->cr_gid != attr.va_gid))) { 756 /* 757 * Mark the process as SUGID before we do 758 * anything that might block. 759 */ 760 p_sugid(p); 761 762 /* Make sure file descriptors 0..2 are in use. */ 763 if ((error = fdcheckstd(p)) != 0) 764 goto exec_abort; 765 766 p->p_ucred = crcopy(cred); 767 #ifdef KTRACE 768 /* 769 * If process is being ktraced, turn off - unless 770 * root set it. 771 */ 772 if (p->p_tracep && !(p->p_traceflag & KTRFAC_ROOT)) 773 ktrderef(p); 774 #endif 775 if (attr.va_mode & S_ISUID) 776 p->p_ucred->cr_uid = attr.va_uid; 777 if (attr.va_mode & S_ISGID) 778 p->p_ucred->cr_gid = attr.va_gid; 779 } else 780 p->p_flag &= ~P_SUGID; 781 p->p_cred->p_svuid = p->p_ucred->cr_uid; 782 p->p_cred->p_svgid = p->p_ucred->cr_gid; 783 784 #if defined(__HAVE_RAS) 785 /* 786 * Remove all RASs from the address space. 787 */ 788 ras_purgeall(p); 789 #endif 790 791 doexechooks(p); 792 793 uvm_km_free(exec_map, (vaddr_t) argp, NCARGS, UVM_KMF_PAGEABLE); 794 795 PNBUF_PUT(nid.ni_cnd.cn_pnbuf); 796 797 /* notify others that we exec'd */ 798 KNOTE(&p->p_klist, NOTE_EXEC); 799 800 /* setup new registers and do misc. setup. */ 801 (*pack.ep_es->es_emul->e_setregs)(l, &pack, (u_long) stack); 802 if (pack.ep_es->es_setregs) 803 (*pack.ep_es->es_setregs)(l, &pack, (u_long) stack); 804 805 /* map the process's signal trampoline code */ 806 if (exec_sigcode_map(p, pack.ep_es->es_emul)) 807 goto exec_abort; 808 809 if (p->p_flag & P_TRACED) 810 psignal(p, SIGTRAP); 811 812 free(pack.ep_hdr, M_EXEC); 813 814 /* 815 * Call emulation specific exec hook. This can setup per-process 816 * p->p_emuldata or do any other per-process stuff an emulation needs. 817 * 818 * If we are executing process of different emulation than the 819 * original forked process, call e_proc_exit() of the old emulation 820 * first, then e_proc_exec() of new emulation. If the emulation is 821 * same, the exec hook code should deallocate any old emulation 822 * resources held previously by this process. 823 */ 824 if (p->p_emul && p->p_emul->e_proc_exit 825 && p->p_emul != pack.ep_es->es_emul) 826 (*p->p_emul->e_proc_exit)(p); 827 828 /* 829 * Call exec hook. Emulation code may NOT store reference to anything 830 * from &pack. 831 */ 832 if (pack.ep_es->es_emul->e_proc_exec) 833 (*pack.ep_es->es_emul->e_proc_exec)(p, &pack); 834 835 /* update p_emul, the old value is no longer needed */ 836 p->p_emul = pack.ep_es->es_emul; 837 838 /* ...and the same for p_execsw */ 839 p->p_execsw = pack.ep_es; 840 841 #ifdef __HAVE_SYSCALL_INTERN 842 (*p->p_emul->e_syscall_intern)(p); 843 #endif 844 #ifdef KTRACE 845 if (KTRPOINT(p, KTR_EMUL)) 846 ktremul(p); 847 #endif 848 849 #ifdef LKM 850 lockmgr(&exec_lock, LK_RELEASE, NULL); 851 #endif 852 p->p_flag &= ~P_INEXEC; 853 854 if (p->p_flag & P_STOPEXEC) { 855 int s; 856 857 sigminusset(&contsigmask, &p->p_sigctx.ps_siglist); 858 SCHED_LOCK(s); 859 p->p_pptr->p_nstopchild++; 860 p->p_stat = SSTOP; 861 l->l_stat = LSSTOP; 862 p->p_nrlwps--; 863 mi_switch(l, NULL); 864 SCHED_ASSERT_UNLOCKED(); 865 splx(s); 866 } 867 868 #ifdef SYSTRACE 869 if (ISSET(p->p_flag, P_SYSTRACE) && 870 wassugid && !ISSET(p->p_flag, P_SUGID)) 871 systrace_execve(pathbuf, p); 872 #endif /* SYSTRACE */ 873 874 return (EJUSTRETURN); 875 876 bad: 877 p->p_flag &= ~P_INEXEC; 878 /* free the vmspace-creation commands, and release their references */ 879 kill_vmcmds(&pack.ep_vmcmds); 880 /* kill any opened file descriptor, if necessary */ 881 if (pack.ep_flags & EXEC_HASFD) { 882 pack.ep_flags &= ~EXEC_HASFD; 883 (void) fdrelease(p, pack.ep_fd); 884 } 885 /* close and put the exec'd file */ 886 vn_lock(pack.ep_vp, LK_EXCLUSIVE | LK_RETRY); 887 VOP_CLOSE(pack.ep_vp, FREAD, cred, p); 888 vput(pack.ep_vp); 889 PNBUF_PUT(nid.ni_cnd.cn_pnbuf); 890 uvm_km_free(exec_map, (vaddr_t) argp, NCARGS, UVM_KMF_PAGEABLE); 891 892 freehdr: 893 free(pack.ep_hdr, M_EXEC); 894 895 #ifdef SYSTRACE 896 clrflg: 897 #endif /* SYSTRACE */ 898 l->l_flag |= oldlwpflags; 899 p->p_flag &= ~P_INEXEC; 900 #ifdef LKM 901 lockmgr(&exec_lock, LK_RELEASE, NULL); 902 #endif 903 904 return error; 905 906 exec_abort: 907 p->p_flag &= ~P_INEXEC; 908 #ifdef LKM 909 lockmgr(&exec_lock, LK_RELEASE, NULL); 910 #endif 911 912 /* 913 * the old process doesn't exist anymore. exit gracefully. 914 * get rid of the (new) address space we have created, if any, get rid 915 * of our namei data and vnode, and exit noting failure 916 */ 917 uvm_deallocate(&vm->vm_map, VM_MIN_ADDRESS, 918 VM_MAXUSER_ADDRESS - VM_MIN_ADDRESS); 919 if (pack.ep_emul_arg) 920 FREE(pack.ep_emul_arg, M_TEMP); 921 PNBUF_PUT(nid.ni_cnd.cn_pnbuf); 922 uvm_km_free(exec_map, (vaddr_t) argp, NCARGS, UVM_KMF_PAGEABLE); 923 free(pack.ep_hdr, M_EXEC); 924 exit1(l, W_EXITCODE(error, SIGABRT)); 925 926 /* NOTREACHED */ 927 return 0; 928 } 929 930 931 int 932 copyargs(struct proc *p, struct exec_package *pack, struct ps_strings *arginfo, 933 char **stackp, void *argp) 934 { 935 char **cpp, *dp, *sp; 936 size_t len; 937 void *nullp; 938 long argc, envc; 939 int error; 940 941 cpp = (char **)*stackp; 942 nullp = NULL; 943 argc = arginfo->ps_nargvstr; 944 envc = arginfo->ps_nenvstr; 945 if ((error = copyout(&argc, cpp++, sizeof(argc))) != 0) 946 return error; 947 948 dp = (char *) (cpp + argc + envc + 2 + pack->ep_es->es_arglen); 949 sp = argp; 950 951 /* XXX don't copy them out, remap them! */ 952 arginfo->ps_argvstr = cpp; /* remember location of argv for later */ 953 954 for (; --argc >= 0; sp += len, dp += len) 955 if ((error = copyout(&dp, cpp++, sizeof(dp))) != 0 || 956 (error = copyoutstr(sp, dp, ARG_MAX, &len)) != 0) 957 return error; 958 959 if ((error = copyout(&nullp, cpp++, sizeof(nullp))) != 0) 960 return error; 961 962 arginfo->ps_envstr = cpp; /* remember location of envp for later */ 963 964 for (; --envc >= 0; sp += len, dp += len) 965 if ((error = copyout(&dp, cpp++, sizeof(dp))) != 0 || 966 (error = copyoutstr(sp, dp, ARG_MAX, &len)) != 0) 967 return error; 968 969 if ((error = copyout(&nullp, cpp++, sizeof(nullp))) != 0) 970 return error; 971 972 *stackp = (char *)cpp; 973 return 0; 974 } 975 976 #ifdef LKM 977 /* 978 * Find an emulation of given name in list of emulations. 979 * Needs to be called with the exec_lock held. 980 */ 981 const struct emul * 982 emul_search(const char *name) 983 { 984 struct emul_entry *it; 985 986 LIST_FOREACH(it, &el_head, el_list) { 987 if (strcmp(name, it->el_emul->e_name) == 0) 988 return it->el_emul; 989 } 990 991 return NULL; 992 } 993 994 /* 995 * Add an emulation to list, if it's not there already. 996 */ 997 int 998 emul_register(const struct emul *emul, int ro_entry) 999 { 1000 struct emul_entry *ee; 1001 int error; 1002 1003 error = 0; 1004 lockmgr(&exec_lock, LK_SHARED, NULL); 1005 1006 if (emul_search(emul->e_name)) { 1007 error = EEXIST; 1008 goto out; 1009 } 1010 1011 MALLOC(ee, struct emul_entry *, sizeof(struct emul_entry), 1012 M_EXEC, M_WAITOK); 1013 ee->el_emul = emul; 1014 ee->ro_entry = ro_entry; 1015 LIST_INSERT_HEAD(&el_head, ee, el_list); 1016 1017 out: 1018 lockmgr(&exec_lock, LK_RELEASE, NULL); 1019 return error; 1020 } 1021 1022 /* 1023 * Remove emulation with name 'name' from list of supported emulations. 1024 */ 1025 int 1026 emul_unregister(const char *name) 1027 { 1028 const struct proclist_desc *pd; 1029 struct emul_entry *it; 1030 int i, error; 1031 struct proc *ptmp; 1032 1033 error = 0; 1034 lockmgr(&exec_lock, LK_SHARED, NULL); 1035 1036 LIST_FOREACH(it, &el_head, el_list) { 1037 if (strcmp(it->el_emul->e_name, name) == 0) 1038 break; 1039 } 1040 1041 if (!it) { 1042 error = ENOENT; 1043 goto out; 1044 } 1045 1046 if (it->ro_entry) { 1047 error = EBUSY; 1048 goto out; 1049 } 1050 1051 /* test if any execw[] entry is still using this */ 1052 for(i=0; i < nexecs; i++) { 1053 if (execsw[i]->es_emul == it->el_emul) { 1054 error = EBUSY; 1055 goto out; 1056 } 1057 } 1058 1059 /* 1060 * Test if any process is running under this emulation - since 1061 * emul_unregister() is running quite sendomly, it's better 1062 * to do expensive check here than to use any locking. 1063 */ 1064 proclist_lock_read(); 1065 for (pd = proclists; pd->pd_list != NULL && !error; pd++) { 1066 PROCLIST_FOREACH(ptmp, pd->pd_list) { 1067 if (ptmp->p_emul == it->el_emul) { 1068 error = EBUSY; 1069 break; 1070 } 1071 } 1072 } 1073 proclist_unlock_read(); 1074 1075 if (error) 1076 goto out; 1077 1078 1079 /* entry is not used, remove it */ 1080 LIST_REMOVE(it, el_list); 1081 FREE(it, M_EXEC); 1082 1083 out: 1084 lockmgr(&exec_lock, LK_RELEASE, NULL); 1085 return error; 1086 } 1087 1088 /* 1089 * Add execsw[] entry. 1090 */ 1091 int 1092 exec_add(struct execsw *esp, const char *e_name) 1093 { 1094 struct exec_entry *it; 1095 int error; 1096 1097 error = 0; 1098 lockmgr(&exec_lock, LK_EXCLUSIVE, NULL); 1099 1100 if (!esp->es_emul) { 1101 esp->es_emul = emul_search(e_name); 1102 if (!esp->es_emul) { 1103 error = ENOENT; 1104 goto out; 1105 } 1106 } 1107 1108 LIST_FOREACH(it, &ex_head, ex_list) { 1109 /* assume tuple (makecmds, probe_func, emulation) is unique */ 1110 if (it->es->es_makecmds == esp->es_makecmds 1111 && it->es->u.elf_probe_func == esp->u.elf_probe_func 1112 && it->es->es_emul == esp->es_emul) { 1113 error = EEXIST; 1114 goto out; 1115 } 1116 } 1117 1118 /* if we got here, the entry doesn't exist yet */ 1119 MALLOC(it, struct exec_entry *, sizeof(struct exec_entry), 1120 M_EXEC, M_WAITOK); 1121 it->es = esp; 1122 LIST_INSERT_HEAD(&ex_head, it, ex_list); 1123 1124 /* update execsw[] */ 1125 exec_init(0); 1126 1127 out: 1128 lockmgr(&exec_lock, LK_RELEASE, NULL); 1129 return error; 1130 } 1131 1132 /* 1133 * Remove execsw[] entry. 1134 */ 1135 int 1136 exec_remove(const struct execsw *esp) 1137 { 1138 struct exec_entry *it; 1139 int error; 1140 1141 error = 0; 1142 lockmgr(&exec_lock, LK_EXCLUSIVE, NULL); 1143 1144 LIST_FOREACH(it, &ex_head, ex_list) { 1145 /* assume tuple (makecmds, probe_func, emulation) is unique */ 1146 if (it->es->es_makecmds == esp->es_makecmds 1147 && it->es->u.elf_probe_func == esp->u.elf_probe_func 1148 && it->es->es_emul == esp->es_emul) 1149 break; 1150 } 1151 if (!it) { 1152 error = ENOENT; 1153 goto out; 1154 } 1155 1156 /* remove item from list and free resources */ 1157 LIST_REMOVE(it, ex_list); 1158 FREE(it, M_EXEC); 1159 1160 /* update execsw[] */ 1161 exec_init(0); 1162 1163 out: 1164 lockmgr(&exec_lock, LK_RELEASE, NULL); 1165 return error; 1166 } 1167 1168 static void 1169 link_es(struct execsw_entry **listp, const struct execsw *esp) 1170 { 1171 struct execsw_entry *et, *e1; 1172 1173 MALLOC(et, struct execsw_entry *, sizeof(struct execsw_entry), 1174 M_TEMP, M_WAITOK); 1175 et->next = NULL; 1176 et->es = esp; 1177 if (*listp == NULL) { 1178 *listp = et; 1179 return; 1180 } 1181 1182 switch(et->es->es_prio) { 1183 case EXECSW_PRIO_FIRST: 1184 /* put new entry as the first */ 1185 et->next = *listp; 1186 *listp = et; 1187 break; 1188 case EXECSW_PRIO_ANY: 1189 /* put new entry after all *_FIRST and *_ANY entries */ 1190 for(e1 = *listp; e1->next 1191 && e1->next->es->es_prio != EXECSW_PRIO_LAST; 1192 e1 = e1->next); 1193 et->next = e1->next; 1194 e1->next = et; 1195 break; 1196 case EXECSW_PRIO_LAST: 1197 /* put new entry as the last one */ 1198 for(e1 = *listp; e1->next; e1 = e1->next); 1199 e1->next = et; 1200 break; 1201 default: 1202 #ifdef DIAGNOSTIC 1203 panic("execw[] entry with unknown priority %d found", 1204 et->es->es_prio); 1205 #endif 1206 break; 1207 } 1208 } 1209 1210 /* 1211 * Initialize exec structures. If init_boot is true, also does necessary 1212 * one-time initialization (it's called from main() that way). 1213 * Once system is multiuser, this should be called with exec_lock held, 1214 * i.e. via exec_{add|remove}(). 1215 */ 1216 int 1217 exec_init(int init_boot) 1218 { 1219 const struct execsw **new_es, * const *old_es; 1220 struct execsw_entry *list, *e1; 1221 struct exec_entry *e2; 1222 int i, es_sz; 1223 1224 if (init_boot) { 1225 /* do one-time initializations */ 1226 lockinit(&exec_lock, PWAIT, "execlck", 0, 0); 1227 1228 /* register compiled-in emulations */ 1229 for(i=0; i < nexecs_builtin; i++) { 1230 if (execsw_builtin[i].es_emul) 1231 emul_register(execsw_builtin[i].es_emul, 1); 1232 } 1233 #ifdef DIAGNOSTIC 1234 if (i == 0) 1235 panic("no emulations found in execsw_builtin[]"); 1236 #endif 1237 } 1238 1239 /* 1240 * Build execsw[] array from builtin entries and entries added 1241 * at runtime. 1242 */ 1243 list = NULL; 1244 for(i=0; i < nexecs_builtin; i++) 1245 link_es(&list, &execsw_builtin[i]); 1246 1247 /* Add dynamically loaded entries */ 1248 es_sz = nexecs_builtin; 1249 LIST_FOREACH(e2, &ex_head, ex_list) { 1250 link_es(&list, e2->es); 1251 es_sz++; 1252 } 1253 1254 /* 1255 * Now that we have sorted all execw entries, create new execsw[] 1256 * and free no longer needed memory in the process. 1257 */ 1258 new_es = malloc(es_sz * sizeof(struct execsw *), M_EXEC, M_WAITOK); 1259 for(i=0; list; i++) { 1260 new_es[i] = list->es; 1261 e1 = list->next; 1262 FREE(list, M_TEMP); 1263 list = e1; 1264 } 1265 1266 /* 1267 * New execsw[] array built, now replace old execsw[] and free 1268 * used memory. 1269 */ 1270 old_es = execsw; 1271 execsw = new_es; 1272 nexecs = es_sz; 1273 if (old_es) 1274 /*XXXUNCONST*/ 1275 free(__UNCONST(old_es), M_EXEC); 1276 1277 /* 1278 * Figure out the maximum size of an exec header. 1279 */ 1280 exec_maxhdrsz = 0; 1281 for (i = 0; i < nexecs; i++) { 1282 if (execsw[i]->es_hdrsz > exec_maxhdrsz) 1283 exec_maxhdrsz = execsw[i]->es_hdrsz; 1284 } 1285 1286 return 0; 1287 } 1288 #endif 1289 1290 #ifndef LKM 1291 /* 1292 * Simplified exec_init() for kernels without LKMs. Only initialize 1293 * exec_maxhdrsz and execsw[]. 1294 */ 1295 int 1296 exec_init(int init_boot) 1297 { 1298 int i; 1299 1300 #ifdef DIAGNOSTIC 1301 if (!init_boot) 1302 panic("exec_init(): called with init_boot == 0"); 1303 #endif 1304 1305 /* do one-time initializations */ 1306 nexecs = nexecs_builtin; 1307 execsw = malloc(nexecs*sizeof(struct execsw *), M_EXEC, M_WAITOK); 1308 1309 /* 1310 * Fill in execsw[] and figure out the maximum size of an exec header. 1311 */ 1312 exec_maxhdrsz = 0; 1313 for(i=0; i < nexecs; i++) { 1314 execsw[i] = &execsw_builtin[i]; 1315 if (execsw_builtin[i].es_hdrsz > exec_maxhdrsz) 1316 exec_maxhdrsz = execsw_builtin[i].es_hdrsz; 1317 } 1318 1319 return 0; 1320 1321 } 1322 #endif /* !LKM */ 1323 1324 static int 1325 exec_sigcode_map(struct proc *p, const struct emul *e) 1326 { 1327 vaddr_t va; 1328 vsize_t sz; 1329 int error; 1330 struct uvm_object *uobj; 1331 1332 sz = (vaddr_t)e->e_esigcode - (vaddr_t)e->e_sigcode; 1333 1334 if (e->e_sigobject == NULL || sz == 0) { 1335 return 0; 1336 } 1337 1338 /* 1339 * If we don't have a sigobject for this emulation, create one. 1340 * 1341 * sigobject is an anonymous memory object (just like SYSV shared 1342 * memory) that we keep a permanent reference to and that we map 1343 * in all processes that need this sigcode. The creation is simple, 1344 * we create an object, add a permanent reference to it, map it in 1345 * kernel space, copy out the sigcode to it and unmap it. 1346 * We map it with PROT_READ|PROT_EXEC into the process just 1347 * the way sys_mmap() would map it. 1348 */ 1349 1350 uobj = *e->e_sigobject; 1351 if (uobj == NULL) { 1352 uobj = uao_create(sz, 0); 1353 (*uobj->pgops->pgo_reference)(uobj); 1354 va = vm_map_min(kernel_map); 1355 if ((error = uvm_map(kernel_map, &va, round_page(sz), 1356 uobj, 0, 0, 1357 UVM_MAPFLAG(UVM_PROT_RW, UVM_PROT_RW, 1358 UVM_INH_SHARE, UVM_ADV_RANDOM, 0)))) { 1359 printf("kernel mapping failed %d\n", error); 1360 (*uobj->pgops->pgo_detach)(uobj); 1361 return (error); 1362 } 1363 memcpy((void *)va, e->e_sigcode, sz); 1364 #ifdef PMAP_NEED_PROCWR 1365 pmap_procwr(&proc0, va, sz); 1366 #endif 1367 uvm_unmap(kernel_map, va, va + round_page(sz)); 1368 *e->e_sigobject = uobj; 1369 } 1370 1371 /* Just a hint to uvm_map where to put it. */ 1372 va = e->e_vm_default_addr(p, (vaddr_t)p->p_vmspace->vm_daddr, 1373 round_page(sz)); 1374 1375 #ifdef __alpha__ 1376 /* 1377 * Tru64 puts /sbin/loader at the end of user virtual memory, 1378 * which causes the above calculation to put the sigcode at 1379 * an invalid address. Put it just below the text instead. 1380 */ 1381 if (va == (vaddr_t)vm_map_max(&p->p_vmspace->vm_map)) { 1382 va = (vaddr_t)p->p_vmspace->vm_taddr - round_page(sz); 1383 } 1384 #endif 1385 1386 (*uobj->pgops->pgo_reference)(uobj); 1387 error = uvm_map(&p->p_vmspace->vm_map, &va, round_page(sz), 1388 uobj, 0, 0, 1389 UVM_MAPFLAG(UVM_PROT_RX, UVM_PROT_RX, UVM_INH_SHARE, 1390 UVM_ADV_RANDOM, 0)); 1391 if (error) { 1392 (*uobj->pgops->pgo_detach)(uobj); 1393 return (error); 1394 } 1395 p->p_sigctx.ps_sigcode = (void *)va; 1396 return (0); 1397 } 1398
Indexes created Mon Sep 22 21:09:42 GMT 2025