kern_exec.c revision 1.203
1 /* $NetBSD: kern_exec.c,v 1.203 2005/07/10 04:20:34 christos 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 1.203 2005/07/10 04:20:34 christos 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 134 135 #ifdef COMPAT_16 136 extern char sigcode[], esigcode[]; 137 struct uvm_object *emul_netbsd_object; 138 #endif 139 140 #ifndef __HAVE_SYSCALL_INTERN 141 void syscall(void); 142 #endif 143 144 /* NetBSD emul struct */ 145 const struct emul emul_netbsd = { 146 "netbsd", 147 NULL, /* emulation path */ 148 #ifndef __HAVE_MINIMAL_EMUL 149 EMUL_HAS_SYS___syscall, 150 NULL, 151 SYS_syscall, 152 SYS_NSYSENT, 153 #endif 154 sysent, 155 #ifdef SYSCALL_DEBUG 156 syscallnames, 157 #else 158 NULL, 159 #endif 160 sendsig, 161 trapsignal, 162 NULL, 163 #ifdef COMPAT_16 164 sigcode, 165 esigcode, 166 &emul_netbsd_object, 167 #else 168 NULL, 169 NULL, 170 NULL, 171 #endif 172 setregs, 173 NULL, 174 NULL, 175 NULL, 176 NULL, 177 NULL, 178 #ifdef __HAVE_SYSCALL_INTERN 179 syscall_intern, 180 #else 181 syscall, 182 #endif 183 NULL, 184 NULL, 185 186 uvm_default_mapaddr, 187 }; 188 189 #ifdef LKM 190 /* 191 * Exec lock. Used to control access to execsw[] structures. 192 * This must not be static so that netbsd32 can access it, too. 193 */ 194 struct lock exec_lock; 195 196 static void link_es(struct execsw_entry **, const struct execsw *); 197 #endif /* LKM */ 198 199 /* 200 * check exec: 201 * given an "executable" described in the exec package's namei info, 202 * see what we can do with it. 203 * 204 * ON ENTRY: 205 * exec package with appropriate namei info 206 * proc pointer of exec'ing proc 207 * if verified exec enabled then flag indicating a direct exec or 208 * an indirect exec (i.e. for a shell script interpreter) 209 * NO SELF-LOCKED VNODES 210 * 211 * ON EXIT: 212 * error: nothing held, etc. exec header still allocated. 213 * ok: filled exec package, executable's vnode (unlocked). 214 * 215 * EXEC SWITCH ENTRY: 216 * Locked vnode to check, exec package, proc. 217 * 218 * EXEC SWITCH EXIT: 219 * ok: return 0, filled exec package, executable's vnode (unlocked). 220 * error: destructive: 221 * everything deallocated execept exec header. 222 * non-destructive: 223 * error code, executable's vnode (unlocked), 224 * exec header unmodified. 225 */ 226 int 227 #ifdef VERIFIED_EXEC 228 check_exec(struct proc *p, struct exec_package *epp, int flag) 229 #else 230 check_exec(struct proc *p, struct exec_package *epp) 231 #endif 232 { 233 int error, i; 234 struct vnode *vp; 235 struct nameidata *ndp; 236 size_t resid; 237 238 ndp = epp->ep_ndp; 239 ndp->ni_cnd.cn_nameiop = LOOKUP; 240 ndp->ni_cnd.cn_flags = FOLLOW | LOCKLEAF | SAVENAME; 241 /* first get the vnode */ 242 if ((error = namei(ndp)) != 0) 243 return error; 244 epp->ep_vp = vp = ndp->ni_vp; 245 246 /* check access and type */ 247 if (vp->v_type != VREG) { 248 error = EACCES; 249 goto bad1; 250 } 251 if ((error = VOP_ACCESS(vp, VEXEC, p->p_ucred, p)) != 0) 252 goto bad1; 253 254 /* get attributes */ 255 if ((error = VOP_GETATTR(vp, epp->ep_vap, p->p_ucred, p)) != 0) 256 goto bad1; 257 258 /* Check mount point */ 259 if (vp->v_mount->mnt_flag & MNT_NOEXEC) { 260 error = EACCES; 261 goto bad1; 262 } 263 if (vp->v_mount->mnt_flag & MNT_NOSUID) 264 epp->ep_vap->va_mode &= ~(S_ISUID | S_ISGID); 265 266 /* try to open it */ 267 if ((error = VOP_OPEN(vp, FREAD, p->p_ucred, p)) != 0) 268 goto bad1; 269 270 /* unlock vp, since we need it unlocked from here on out. */ 271 VOP_UNLOCK(vp, 0); 272 273 274 #ifdef VERIFIED_EXEC 275 /* Evaluate signature for file... */ 276 if ((error = veriexec_verify(p, vp, epp->ep_vap, epp->ep_name, 277 flag, NULL)) != 0) 278 goto bad2; 279 #endif 280 281 /* now we have the file, get the exec header */ 282 uvn_attach(vp, VM_PROT_READ); 283 error = vn_rdwr(UIO_READ, vp, epp->ep_hdr, epp->ep_hdrlen, 0, 284 UIO_SYSSPACE, 0, p->p_ucred, &resid, NULL); 285 if (error) 286 goto bad2; 287 epp->ep_hdrvalid = epp->ep_hdrlen - resid; 288 289 /* 290 * Set up default address space limits. Can be overridden 291 * by individual exec packages. 292 * 293 * XXX probably should be all done in the exec pakages. 294 */ 295 epp->ep_vm_minaddr = VM_MIN_ADDRESS; 296 epp->ep_vm_maxaddr = VM_MAXUSER_ADDRESS; 297 /* 298 * set up the vmcmds for creation of the process 299 * address space 300 */ 301 error = ENOEXEC; 302 for (i = 0; i < nexecs && error != 0; i++) { 303 int newerror; 304 305 epp->ep_esch = execsw[i]; 306 newerror = (*execsw[i]->es_makecmds)(p, epp); 307 /* make sure the first "interesting" error code is saved. */ 308 if (!newerror || error == ENOEXEC) 309 error = newerror; 310 311 /* if es_makecmds call was successful, update epp->ep_es */ 312 if (!newerror && (epp->ep_flags & EXEC_HASES) == 0) 313 epp->ep_es = execsw[i]; 314 315 if (epp->ep_flags & EXEC_DESTR && error != 0) 316 return error; 317 } 318 if (!error) { 319 /* check that entry point is sane */ 320 if (epp->ep_entry > VM_MAXUSER_ADDRESS) 321 error = ENOEXEC; 322 323 /* check limits */ 324 if ((epp->ep_tsize > MAXTSIZ) || 325 (epp->ep_dsize > 326 (u_quad_t)p->p_rlimit[RLIMIT_DATA].rlim_cur)) 327 error = ENOMEM; 328 329 if (!error) 330 return (0); 331 } 332 333 /* 334 * free any vmspace-creation commands, 335 * and release their references 336 */ 337 kill_vmcmds(&epp->ep_vmcmds); 338 339 bad2: 340 /* 341 * close and release the vnode, restore the old one, free the 342 * pathname buf, and punt. 343 */ 344 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 345 VOP_CLOSE(vp, FREAD, p->p_ucred, p); 346 vput(vp); 347 PNBUF_PUT(ndp->ni_cnd.cn_pnbuf); 348 return error; 349 350 bad1: 351 /* 352 * free the namei pathname buffer, and put the vnode 353 * (which we don't yet have open). 354 */ 355 vput(vp); /* was still locked */ 356 PNBUF_PUT(ndp->ni_cnd.cn_pnbuf); 357 return error; 358 } 359 360 #ifdef __MACHINE_STACK_GROWS_UP 361 #define STACK_PTHREADSPACE NBPG 362 #else 363 #define STACK_PTHREADSPACE 0 364 #endif 365 366 /* 367 * exec system call 368 */ 369 /* ARGSUSED */ 370 int 371 sys_execve(struct lwp *l, void *v, register_t *retval) 372 { 373 struct sys_execve_args /* { 374 syscallarg(const char *) path; 375 syscallarg(char * const *) argp; 376 syscallarg(char * const *) envp; 377 } */ *uap = v; 378 int error; 379 u_int i; 380 struct exec_package pack; 381 struct nameidata nid; 382 struct vattr attr; 383 struct proc *p; 384 struct ucred *cred; 385 char *argp; 386 char * const *cpp; 387 char *dp, *sp; 388 long argc, envc; 389 size_t len; 390 char *stack; 391 struct ps_strings arginfo; 392 struct vmspace *vm; 393 char **tmpfap; 394 int szsigcode; 395 struct exec_vmcmd *base_vcp; 396 int oldlwpflags; 397 #ifdef SYSTRACE 398 int wassugid = ISSET(p->p_flag, P_SUGID); 399 char pathbuf[MAXPATHLEN]; 400 size_t pathbuflen; 401 #endif /* SYSTRACE */ 402 403 /* Disable scheduler activation upcalls. */ 404 oldlwpflags = l->l_flag & (L_SA | L_SA_UPCALL); 405 if (l->l_flag & L_SA) 406 l->l_flag &= ~(L_SA | L_SA_UPCALL); 407 408 p = l->l_proc; 409 /* 410 * Lock the process and set the P_INEXEC flag to indicate that 411 * it should be left alone until we're done here. This is 412 * necessary to avoid race conditions - e.g. in ptrace() - 413 * that might allow a local user to illicitly obtain elevated 414 * privileges. 415 */ 416 p->p_flag |= P_INEXEC; 417 418 cred = p->p_ucred; 419 base_vcp = NULL; 420 /* 421 * Init the namei data to point the file user's program name. 422 * This is done here rather than in check_exec(), so that it's 423 * possible to override this settings if any of makecmd/probe 424 * functions call check_exec() recursively - for example, 425 * see exec_script_makecmds(). 426 */ 427 #ifdef SYSTRACE 428 if (ISSET(p->p_flag, P_SYSTRACE)) 429 systrace_execve0(p); 430 431 error = copyinstr(SCARG(uap, path), pathbuf, sizeof(pathbuf), 432 &pathbuflen); 433 if (error) 434 goto clrflg; 435 436 NDINIT(&nid, LOOKUP, NOFOLLOW, UIO_SYSSPACE, pathbuf, p); 437 #else 438 NDINIT(&nid, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 439 #endif /* SYSTRACE */ 440 441 /* 442 * initialize the fields of the exec package. 443 */ 444 #ifdef SYSTRACE 445 pack.ep_name = pathbuf; 446 #else 447 pack.ep_name = SCARG(uap, path); 448 #endif /* SYSTRACE */ 449 pack.ep_hdr = malloc(exec_maxhdrsz, M_EXEC, M_WAITOK); 450 pack.ep_hdrlen = exec_maxhdrsz; 451 pack.ep_hdrvalid = 0; 452 pack.ep_ndp = &nid; 453 pack.ep_emul_arg = NULL; 454 pack.ep_vmcmds.evs_cnt = 0; 455 pack.ep_vmcmds.evs_used = 0; 456 pack.ep_vap = &attr; 457 pack.ep_flags = 0; 458 459 #ifdef LKM 460 lockmgr(&exec_lock, LK_SHARED, NULL); 461 #endif 462 463 /* see if we can run it. */ 464 #ifdef VERIFIED_EXEC 465 if ((error = check_exec(p, &pack, VERIEXEC_DIRECT)) != 0) 466 #else 467 if ((error = check_exec(p, &pack)) != 0) 468 #endif 469 goto freehdr; 470 471 /* XXX -- THE FOLLOWING SECTION NEEDS MAJOR CLEANUP */ 472 473 /* allocate an argument buffer */ 474 argp = (char *) uvm_km_alloc(exec_map, NCARGS, 0, 475 UVM_KMF_PAGEABLE|UVM_KMF_WAITVA); 476 #ifdef DIAGNOSTIC 477 if (argp == (vaddr_t) 0) 478 panic("execve: argp == NULL"); 479 #endif 480 dp = argp; 481 argc = 0; 482 483 /* copy the fake args list, if there's one, freeing it as we go */ 484 if (pack.ep_flags & EXEC_HASARGL) { 485 tmpfap = pack.ep_fa; 486 while (*tmpfap != NULL) { 487 char *cp; 488 489 cp = *tmpfap; 490 while (*cp) 491 *dp++ = *cp++; 492 dp++; 493 494 FREE(*tmpfap, M_EXEC); 495 tmpfap++; argc++; 496 } 497 FREE(pack.ep_fa, M_EXEC); 498 pack.ep_flags &= ~EXEC_HASARGL; 499 } 500 501 /* Now get argv & environment */ 502 if (!(cpp = SCARG(uap, argp))) { 503 error = EINVAL; 504 goto bad; 505 } 506 507 if (pack.ep_flags & EXEC_SKIPARG) 508 cpp++; 509 510 while (1) { 511 len = argp + ARG_MAX - dp; 512 if ((error = copyin(cpp, &sp, sizeof(sp))) != 0) 513 goto bad; 514 if (!sp) 515 break; 516 if ((error = copyinstr(sp, dp, len, &len)) != 0) { 517 if (error == ENAMETOOLONG) 518 error = E2BIG; 519 goto bad; 520 } 521 #ifdef KTRACE 522 if (KTRPOINT(p, KTR_EXEC_ARG)) 523 ktrkmem(p, KTR_EXEC_ARG, dp, len - 1); 524 #endif 525 dp += len; 526 cpp++; 527 argc++; 528 } 529 530 envc = 0; 531 /* environment need not be there */ 532 if ((cpp = SCARG(uap, envp)) != NULL ) { 533 while (1) { 534 len = argp + ARG_MAX - dp; 535 if ((error = copyin(cpp, &sp, sizeof(sp))) != 0) 536 goto bad; 537 if (!sp) 538 break; 539 if ((error = copyinstr(sp, dp, len, &len)) != 0) { 540 if (error == ENAMETOOLONG) 541 error = E2BIG; 542 goto bad; 543 } 544 #ifdef KTRACE 545 if (KTRPOINT(p, KTR_EXEC_ENV)) 546 ktrkmem(p, KTR_EXEC_ENV, dp, len - 1); 547 #endif 548 dp += len; 549 cpp++; 550 envc++; 551 } 552 } 553 554 dp = (char *) ALIGN(dp); 555 556 szsigcode = pack.ep_es->es_emul->e_esigcode - 557 pack.ep_es->es_emul->e_sigcode; 558 559 /* Now check if args & environ fit into new stack */ 560 if (pack.ep_flags & EXEC_32) 561 len = ((argc + envc + 2 + pack.ep_es->es_arglen) * 562 sizeof(int) + sizeof(int) + dp + STACKGAPLEN + 563 szsigcode + sizeof(struct ps_strings) + STACK_PTHREADSPACE) 564 - argp; 565 else 566 len = ((argc + envc + 2 + pack.ep_es->es_arglen) * 567 sizeof(char *) + sizeof(int) + dp + STACKGAPLEN + 568 szsigcode + sizeof(struct ps_strings) + STACK_PTHREADSPACE) 569 - argp; 570 571 len = ALIGN(len); /* make the stack "safely" aligned */ 572 573 if (len > pack.ep_ssize) { /* in effect, compare to initial limit */ 574 error = ENOMEM; 575 goto bad; 576 } 577 578 /* Get rid of other LWPs/ */ 579 p->p_flag |= P_WEXIT; /* XXX hack. lwp-exit stuff wants to see it. */ 580 exit_lwps(l); 581 p->p_flag &= ~P_WEXIT; 582 KDASSERT(p->p_nlwps == 1); 583 584 /* This is now LWP 1 */ 585 l->l_lid = 1; 586 p->p_nlwpid = 1; 587 588 /* Release any SA state. */ 589 if (p->p_sa) 590 sa_release(p); 591 592 /* Remove POSIX timers */ 593 timers_free(p, TIMERS_POSIX); 594 595 /* adjust "active stack depth" for process VSZ */ 596 pack.ep_ssize = len; /* maybe should go elsewhere, but... */ 597 598 /* 599 * Do whatever is necessary to prepare the address space 600 * for remapping. Note that this might replace the current 601 * vmspace with another! 602 */ 603 uvmspace_exec(l, pack.ep_vm_minaddr, pack.ep_vm_maxaddr); 604 605 /* record proc's vnode, for use by procfs and others */ 606 if (p->p_textvp) 607 vrele(p->p_textvp); 608 VREF(pack.ep_vp); 609 p->p_textvp = pack.ep_vp; 610 611 /* Now map address space */ 612 vm = p->p_vmspace; 613 vm->vm_taddr = (caddr_t) pack.ep_taddr; 614 vm->vm_tsize = btoc(pack.ep_tsize); 615 vm->vm_daddr = (caddr_t) pack.ep_daddr; 616 vm->vm_dsize = btoc(pack.ep_dsize); 617 vm->vm_ssize = btoc(pack.ep_ssize); 618 vm->vm_maxsaddr = (caddr_t) pack.ep_maxsaddr; 619 vm->vm_minsaddr = (caddr_t) pack.ep_minsaddr; 620 621 /* create the new process's VM space by running the vmcmds */ 622 #ifdef DIAGNOSTIC 623 if (pack.ep_vmcmds.evs_used == 0) 624 panic("execve: no vmcmds"); 625 #endif 626 for (i = 0; i < pack.ep_vmcmds.evs_used && !error; i++) { 627 struct exec_vmcmd *vcp; 628 629 vcp = &pack.ep_vmcmds.evs_cmds[i]; 630 if (vcp->ev_flags & VMCMD_RELATIVE) { 631 #ifdef DIAGNOSTIC 632 if (base_vcp == NULL) 633 panic("execve: relative vmcmd with no base"); 634 if (vcp->ev_flags & VMCMD_BASE) 635 panic("execve: illegal base & relative vmcmd"); 636 #endif 637 vcp->ev_addr += base_vcp->ev_addr; 638 } 639 error = (*vcp->ev_proc)(p, vcp); 640 #ifdef DEBUG_EXEC 641 if (error) { 642 int j; 643 struct exec_vmcmd *vp = &pack.ep_vmcmds.evs_cmds[0]; 644 for (j = 0; j <= i; j++) 645 uprintf( 646 "vmcmd[%d] = %#lx/%#lx fd@%#lx prot=0%o flags=%d\n", 647 j, vp[j].ev_addr, vp[j].ev_len, 648 vp[j].ev_offset, vp[j].ev_prot, 649 vp[j].ev_flags); 650 } 651 #endif /* DEBUG_EXEC */ 652 if (vcp->ev_flags & VMCMD_BASE) 653 base_vcp = vcp; 654 } 655 656 /* free the vmspace-creation commands, and release their references */ 657 kill_vmcmds(&pack.ep_vmcmds); 658 659 vn_lock(pack.ep_vp, LK_EXCLUSIVE | LK_RETRY); 660 VOP_CLOSE(pack.ep_vp, FREAD, cred, p); 661 vput(pack.ep_vp); 662 663 /* if an error happened, deallocate and punt */ 664 if (error) { 665 DPRINTF(("execve: vmcmd %i failed: %d\n", i - 1, error)); 666 goto exec_abort; 667 } 668 669 /* remember information about the process */ 670 arginfo.ps_nargvstr = argc; 671 arginfo.ps_nenvstr = envc; 672 673 stack = (char *)STACK_ALLOC(STACK_GROW(vm->vm_minsaddr, 674 STACK_PTHREADSPACE + sizeof(struct ps_strings) + szsigcode), 675 len - (sizeof(struct ps_strings) + szsigcode)); 676 #ifdef __MACHINE_STACK_GROWS_UP 677 /* 678 * The copyargs call always copies into lower addresses 679 * first, moving towards higher addresses, starting with 680 * the stack pointer that we give. When the stack grows 681 * down, this puts argc/argv/envp very shallow on the 682 * stack, right at the first user stack pointer, and puts 683 * STACKGAPLEN very deep in the stack. When the stack 684 * grows up, the situation is reversed. 685 * 686 * Normally, this is no big deal. But the ld_elf.so _rtld() 687 * function expects to be called with a single pointer to 688 * a region that has a few words it can stash values into, 689 * followed by argc/argv/envp. When the stack grows down, 690 * it's easy to decrement the stack pointer a little bit to 691 * allocate the space for these few words and pass the new 692 * stack pointer to _rtld. When the stack grows up, however, 693 * a few words before argc is part of the signal trampoline, XXX 694 * so we have a problem. 695 * 696 * Instead of changing how _rtld works, we take the easy way 697 * out and steal 32 bytes before we call copyargs. This 698 * space is effectively stolen from STACKGAPLEN. 699 */ 700 stack += 32; 701 #endif /* __MACHINE_STACK_GROWS_UP */ 702 703 /* Now copy argc, args & environ to new stack */ 704 error = (*pack.ep_es->es_copyargs)(p, &pack, &arginfo, &stack, argp); 705 if (error) { 706 DPRINTF(("execve: copyargs failed %d\n", error)); 707 goto exec_abort; 708 } 709 /* Move the stack back to original point */ 710 stack = (char *)STACK_GROW(vm->vm_minsaddr, len); 711 712 /* fill process ps_strings info */ 713 p->p_psstr = (struct ps_strings *) 714 STACK_ALLOC(STACK_GROW(vm->vm_minsaddr, STACK_PTHREADSPACE), 715 sizeof(struct ps_strings)); 716 p->p_psargv = offsetof(struct ps_strings, ps_argvstr); 717 p->p_psnargv = offsetof(struct ps_strings, ps_nargvstr); 718 p->p_psenv = offsetof(struct ps_strings, ps_envstr); 719 p->p_psnenv = offsetof(struct ps_strings, ps_nenvstr); 720 721 /* copy out the process's ps_strings structure */ 722 if ((error = copyout(&arginfo, (char *)p->p_psstr, 723 sizeof(arginfo))) != 0) { 724 DPRINTF(("execve: ps_strings copyout %p->%p size %ld failed\n", 725 &arginfo, (char *)p->p_psstr, (long)sizeof(arginfo))); 726 goto exec_abort; 727 } 728 729 stopprofclock(p); /* stop profiling */ 730 fdcloseexec(p); /* handle close on exec */ 731 execsigs(p); /* reset catched signals */ 732 733 l->l_ctxlink = NULL; /* reset ucontext link */ 734 735 /* set command name & other accounting info */ 736 len = min(nid.ni_cnd.cn_namelen, MAXCOMLEN); 737 memcpy(p->p_comm, nid.ni_cnd.cn_nameptr, len); 738 p->p_comm[len] = 0; 739 p->p_acflag &= ~AFORK; 740 741 p->p_flag |= P_EXEC; 742 if (p->p_flag & P_PPWAIT) { 743 p->p_flag &= ~P_PPWAIT; 744 wakeup((caddr_t) p->p_pptr); 745 } 746 747 /* 748 * deal with set[ug]id. 749 * MNT_NOSUID has already been used to disable s[ug]id. 750 */ 751 if ((p->p_flag & P_TRACED) == 0 && 752 753 (((attr.va_mode & S_ISUID) != 0 && 754 p->p_ucred->cr_uid != attr.va_uid) || 755 756 ((attr.va_mode & S_ISGID) != 0 && 757 p->p_ucred->cr_gid != attr.va_gid))) { 758 /* 759 * Mark the process as SUGID before we do 760 * anything that might block. 761 */ 762 p_sugid(p); 763 764 /* Make sure file descriptors 0..2 are in use. */ 765 if ((error = fdcheckstd(p)) != 0) 766 goto exec_abort; 767 768 p->p_ucred = crcopy(cred); 769 #ifdef KTRACE 770 /* 771 * If process is being ktraced, turn off - unless 772 * root set it. 773 */ 774 if (p->p_tracep && !(p->p_traceflag & KTRFAC_ROOT)) 775 ktrderef(p); 776 #endif 777 if (attr.va_mode & S_ISUID) 778 p->p_ucred->cr_uid = attr.va_uid; 779 if (attr.va_mode & S_ISGID) 780 p->p_ucred->cr_gid = attr.va_gid; 781 } else 782 p->p_flag &= ~P_SUGID; 783 p->p_cred->p_svuid = p->p_ucred->cr_uid; 784 p->p_cred->p_svgid = p->p_ucred->cr_gid; 785 786 #if defined(__HAVE_RAS) 787 /* 788 * Remove all RASs from the address space. 789 */ 790 ras_purgeall(p); 791 #endif 792 793 doexechooks(p); 794 795 uvm_km_free(exec_map, (vaddr_t) argp, NCARGS, UVM_KMF_PAGEABLE); 796 797 PNBUF_PUT(nid.ni_cnd.cn_pnbuf); 798 799 /* notify others that we exec'd */ 800 KNOTE(&p->p_klist, NOTE_EXEC); 801 802 /* setup new registers and do misc. setup. */ 803 (*pack.ep_es->es_emul->e_setregs)(l, &pack, (u_long) stack); 804 if (pack.ep_es->es_setregs) 805 (*pack.ep_es->es_setregs)(l, &pack, (u_long) stack); 806 807 /* map the process's signal trampoline code */ 808 if (exec_sigcode_map(p, pack.ep_es->es_emul)) 809 goto exec_abort; 810 811 if (p->p_flag & P_TRACED) 812 psignal(p, SIGTRAP); 813 814 free(pack.ep_hdr, M_EXEC); 815 816 /* 817 * Call emulation specific exec hook. This can setup per-process 818 * p->p_emuldata or do any other per-process stuff an emulation needs. 819 * 820 * If we are executing process of different emulation than the 821 * original forked process, call e_proc_exit() of the old emulation 822 * first, then e_proc_exec() of new emulation. If the emulation is 823 * same, the exec hook code should deallocate any old emulation 824 * resources held previously by this process. 825 */ 826 if (p->p_emul && p->p_emul->e_proc_exit 827 && p->p_emul != pack.ep_es->es_emul) 828 (*p->p_emul->e_proc_exit)(p); 829 830 /* 831 * Call exec hook. Emulation code may NOT store reference to anything 832 * from &pack. 833 */ 834 if (pack.ep_es->es_emul->e_proc_exec) 835 (*pack.ep_es->es_emul->e_proc_exec)(p, &pack); 836 837 /* update p_emul, the old value is no longer needed */ 838 p->p_emul = pack.ep_es->es_emul; 839 840 /* ...and the same for p_execsw */ 841 p->p_execsw = pack.ep_es; 842 843 #ifdef __HAVE_SYSCALL_INTERN 844 (*p->p_emul->e_syscall_intern)(p); 845 #endif 846 #ifdef KTRACE 847 if (KTRPOINT(p, KTR_EMUL)) 848 ktremul(p); 849 #endif 850 851 #ifdef LKM 852 lockmgr(&exec_lock, LK_RELEASE, NULL); 853 #endif 854 p->p_flag &= ~P_INEXEC; 855 856 if (p->p_flag & P_STOPEXEC) { 857 int s; 858 859 sigminusset(&contsigmask, &p->p_sigctx.ps_siglist); 860 SCHED_LOCK(s); 861 p->p_pptr->p_nstopchild++; 862 p->p_stat = SSTOP; 863 l->l_stat = LSSTOP; 864 p->p_nrlwps--; 865 mi_switch(l, NULL); 866 SCHED_ASSERT_UNLOCKED(); 867 splx(s); 868 } 869 870 #ifdef SYSTRACE 871 if (ISSET(p->p_flag, P_SYSTRACE) && 872 wassugid && !ISSET(p->p_flag, P_SUGID)) 873 systrace_execve1(pathbuf, p); 874 #endif /* SYSTRACE */ 875 876 return (EJUSTRETURN); 877 878 bad: 879 p->p_flag &= ~P_INEXEC; 880 /* free the vmspace-creation commands, and release their references */ 881 kill_vmcmds(&pack.ep_vmcmds); 882 /* kill any opened file descriptor, if necessary */ 883 if (pack.ep_flags & EXEC_HASFD) { 884 pack.ep_flags &= ~EXEC_HASFD; 885 (void) fdrelease(p, pack.ep_fd); 886 } 887 /* close and put the exec'd file */ 888 vn_lock(pack.ep_vp, LK_EXCLUSIVE | LK_RETRY); 889 VOP_CLOSE(pack.ep_vp, FREAD, cred, p); 890 vput(pack.ep_vp); 891 PNBUF_PUT(nid.ni_cnd.cn_pnbuf); 892 uvm_km_free(exec_map, (vaddr_t) argp, NCARGS, UVM_KMF_PAGEABLE); 893 894 freehdr: 895 free(pack.ep_hdr, M_EXEC); 896 897 #ifdef SYSTRACE 898 clrflg: 899 #endif /* SYSTRACE */ 900 l->l_flag |= oldlwpflags; 901 p->p_flag &= ~P_INEXEC; 902 #ifdef LKM 903 lockmgr(&exec_lock, LK_RELEASE, NULL); 904 #endif 905 906 return error; 907 908 exec_abort: 909 p->p_flag &= ~P_INEXEC; 910 #ifdef LKM 911 lockmgr(&exec_lock, LK_RELEASE, NULL); 912 #endif 913 914 /* 915 * the old process doesn't exist anymore. exit gracefully. 916 * get rid of the (new) address space we have created, if any, get rid 917 * of our namei data and vnode, and exit noting failure 918 */ 919 uvm_deallocate(&vm->vm_map, VM_MIN_ADDRESS, 920 VM_MAXUSER_ADDRESS - VM_MIN_ADDRESS); 921 if (pack.ep_emul_arg) 922 FREE(pack.ep_emul_arg, M_TEMP); 923 PNBUF_PUT(nid.ni_cnd.cn_pnbuf); 924 uvm_km_free(exec_map, (vaddr_t) argp, NCARGS, UVM_KMF_PAGEABLE); 925 free(pack.ep_hdr, M_EXEC); 926 exit1(l, W_EXITCODE(error, SIGABRT)); 927 928 /* NOTREACHED */ 929 return 0; 930 } 931 932 933 int 934 copyargs(struct proc *p, struct exec_package *pack, struct ps_strings *arginfo, 935 char **stackp, void *argp) 936 { 937 char **cpp, *dp, *sp; 938 size_t len; 939 void *nullp; 940 long argc, envc; 941 int error; 942 943 cpp = (char **)*stackp; 944 nullp = NULL; 945 argc = arginfo->ps_nargvstr; 946 envc = arginfo->ps_nenvstr; 947 if ((error = copyout(&argc, cpp++, sizeof(argc))) != 0) 948 return error; 949 950 dp = (char *) (cpp + argc + envc + 2 + pack->ep_es->es_arglen); 951 sp = argp; 952 953 /* XXX don't copy them out, remap them! */ 954 arginfo->ps_argvstr = cpp; /* remember location of argv for later */ 955 956 for (; --argc >= 0; sp += len, dp += len) 957 if ((error = copyout(&dp, cpp++, sizeof(dp))) != 0 || 958 (error = copyoutstr(sp, dp, ARG_MAX, &len)) != 0) 959 return error; 960 961 if ((error = copyout(&nullp, cpp++, sizeof(nullp))) != 0) 962 return error; 963 964 arginfo->ps_envstr = cpp; /* remember location of envp for later */ 965 966 for (; --envc >= 0; sp += len, dp += len) 967 if ((error = copyout(&dp, cpp++, sizeof(dp))) != 0 || 968 (error = copyoutstr(sp, dp, ARG_MAX, &len)) != 0) 969 return error; 970 971 if ((error = copyout(&nullp, cpp++, sizeof(nullp))) != 0) 972 return error; 973 974 *stackp = (char *)cpp; 975 return 0; 976 } 977 978 #ifdef LKM 979 /* 980 * Find an emulation of given name in list of emulations. 981 * Needs to be called with the exec_lock held. 982 */ 983 const struct emul * 984 emul_search(const char *name) 985 { 986 struct emul_entry *it; 987 988 LIST_FOREACH(it, &el_head, el_list) { 989 if (strcmp(name, it->el_emul->e_name) == 0) 990 return it->el_emul; 991 } 992 993 return NULL; 994 } 995 996 /* 997 * Add an emulation to list, if it's not there already. 998 */ 999 int 1000 emul_register(const struct emul *emul, int ro_entry) 1001 { 1002 struct emul_entry *ee; 1003 int error; 1004 1005 error = 0; 1006 lockmgr(&exec_lock, LK_SHARED, NULL); 1007 1008 if (emul_search(emul->e_name)) { 1009 error = EEXIST; 1010 goto out; 1011 } 1012 1013 MALLOC(ee, struct emul_entry *, sizeof(struct emul_entry), 1014 M_EXEC, M_WAITOK); 1015 ee->el_emul = emul; 1016 ee->ro_entry = ro_entry; 1017 LIST_INSERT_HEAD(&el_head, ee, el_list); 1018 1019 out: 1020 lockmgr(&exec_lock, LK_RELEASE, NULL); 1021 return error; 1022 } 1023 1024 /* 1025 * Remove emulation with name 'name' from list of supported emulations. 1026 */ 1027 int 1028 emul_unregister(const char *name) 1029 { 1030 const struct proclist_desc *pd; 1031 struct emul_entry *it; 1032 int i, error; 1033 struct proc *ptmp; 1034 1035 error = 0; 1036 lockmgr(&exec_lock, LK_SHARED, NULL); 1037 1038 LIST_FOREACH(it, &el_head, el_list) { 1039 if (strcmp(it->el_emul->e_name, name) == 0) 1040 break; 1041 } 1042 1043 if (!it) { 1044 error = ENOENT; 1045 goto out; 1046 } 1047 1048 if (it->ro_entry) { 1049 error = EBUSY; 1050 goto out; 1051 } 1052 1053 /* test if any execw[] entry is still using this */ 1054 for(i=0; i < nexecs; i++) { 1055 if (execsw[i]->es_emul == it->el_emul) { 1056 error = EBUSY; 1057 goto out; 1058 } 1059 } 1060 1061 /* 1062 * Test if any process is running under this emulation - since 1063 * emul_unregister() is running quite sendomly, it's better 1064 * to do expensive check here than to use any locking. 1065 */ 1066 proclist_lock_read(); 1067 for (pd = proclists; pd->pd_list != NULL && !error; pd++) { 1068 PROCLIST_FOREACH(ptmp, pd->pd_list) { 1069 if (ptmp->p_emul == it->el_emul) { 1070 error = EBUSY; 1071 break; 1072 } 1073 } 1074 } 1075 proclist_unlock_read(); 1076 1077 if (error) 1078 goto out; 1079 1080 1081 /* entry is not used, remove it */ 1082 LIST_REMOVE(it, el_list); 1083 FREE(it, M_EXEC); 1084 1085 out: 1086 lockmgr(&exec_lock, LK_RELEASE, NULL); 1087 return error; 1088 } 1089 1090 /* 1091 * Add execsw[] entry. 1092 */ 1093 int 1094 exec_add(struct execsw *esp, const char *e_name) 1095 { 1096 struct exec_entry *it; 1097 int error; 1098 1099 error = 0; 1100 lockmgr(&exec_lock, LK_EXCLUSIVE, NULL); 1101 1102 if (!esp->es_emul) { 1103 esp->es_emul = emul_search(e_name); 1104 if (!esp->es_emul) { 1105 error = ENOENT; 1106 goto out; 1107 } 1108 } 1109 1110 LIST_FOREACH(it, &ex_head, ex_list) { 1111 /* assume tuple (makecmds, probe_func, emulation) is unique */ 1112 if (it->es->es_makecmds == esp->es_makecmds 1113 && it->es->u.elf_probe_func == esp->u.elf_probe_func 1114 && it->es->es_emul == esp->es_emul) { 1115 error = EEXIST; 1116 goto out; 1117 } 1118 } 1119 1120 /* if we got here, the entry doesn't exist yet */ 1121 MALLOC(it, struct exec_entry *, sizeof(struct exec_entry), 1122 M_EXEC, M_WAITOK); 1123 it->es = esp; 1124 LIST_INSERT_HEAD(&ex_head, it, ex_list); 1125 1126 /* update execsw[] */ 1127 exec_init(0); 1128 1129 out: 1130 lockmgr(&exec_lock, LK_RELEASE, NULL); 1131 return error; 1132 } 1133 1134 /* 1135 * Remove execsw[] entry. 1136 */ 1137 int 1138 exec_remove(const struct execsw *esp) 1139 { 1140 struct exec_entry *it; 1141 int error; 1142 1143 error = 0; 1144 lockmgr(&exec_lock, LK_EXCLUSIVE, NULL); 1145 1146 LIST_FOREACH(it, &ex_head, ex_list) { 1147 /* assume tuple (makecmds, probe_func, emulation) is unique */ 1148 if (it->es->es_makecmds == esp->es_makecmds 1149 && it->es->u.elf_probe_func == esp->u.elf_probe_func 1150 && it->es->es_emul == esp->es_emul) 1151 break; 1152 } 1153 if (!it) { 1154 error = ENOENT; 1155 goto out; 1156 } 1157 1158 /* remove item from list and free resources */ 1159 LIST_REMOVE(it, ex_list); 1160 FREE(it, M_EXEC); 1161 1162 /* update execsw[] */ 1163 exec_init(0); 1164 1165 out: 1166 lockmgr(&exec_lock, LK_RELEASE, NULL); 1167 return error; 1168 } 1169 1170 static void 1171 link_es(struct execsw_entry **listp, const struct execsw *esp) 1172 { 1173 struct execsw_entry *et, *e1; 1174 1175 MALLOC(et, struct execsw_entry *, sizeof(struct execsw_entry), 1176 M_TEMP, M_WAITOK); 1177 et->next = NULL; 1178 et->es = esp; 1179 if (*listp == NULL) { 1180 *listp = et; 1181 return; 1182 } 1183 1184 switch(et->es->es_prio) { 1185 case EXECSW_PRIO_FIRST: 1186 /* put new entry as the first */ 1187 et->next = *listp; 1188 *listp = et; 1189 break; 1190 case EXECSW_PRIO_ANY: 1191 /* put new entry after all *_FIRST and *_ANY entries */ 1192 for(e1 = *listp; e1->next 1193 && e1->next->es->es_prio != EXECSW_PRIO_LAST; 1194 e1 = e1->next); 1195 et->next = e1->next; 1196 e1->next = et; 1197 break; 1198 case EXECSW_PRIO_LAST: 1199 /* put new entry as the last one */ 1200 for(e1 = *listp; e1->next; e1 = e1->next); 1201 e1->next = et; 1202 break; 1203 default: 1204 #ifdef DIAGNOSTIC 1205 panic("execw[] entry with unknown priority %d found", 1206 et->es->es_prio); 1207 #endif 1208 break; 1209 } 1210 } 1211 1212 /* 1213 * Initialize exec structures. If init_boot is true, also does necessary 1214 * one-time initialization (it's called from main() that way). 1215 * Once system is multiuser, this should be called with exec_lock held, 1216 * i.e. via exec_{add|remove}(). 1217 */ 1218 int 1219 exec_init(int init_boot) 1220 { 1221 const struct execsw **new_es, * const *old_es; 1222 struct execsw_entry *list, *e1; 1223 struct exec_entry *e2; 1224 int i, es_sz; 1225 1226 if (init_boot) { 1227 /* do one-time initializations */ 1228 lockinit(&exec_lock, PWAIT, "execlck", 0, 0); 1229 1230 /* register compiled-in emulations */ 1231 for(i=0; i < nexecs_builtin; i++) { 1232 if (execsw_builtin[i].es_emul) 1233 emul_register(execsw_builtin[i].es_emul, 1); 1234 } 1235 #ifdef DIAGNOSTIC 1236 if (i == 0) 1237 panic("no emulations found in execsw_builtin[]"); 1238 #endif 1239 } 1240 1241 /* 1242 * Build execsw[] array from builtin entries and entries added 1243 * at runtime. 1244 */ 1245 list = NULL; 1246 for(i=0; i < nexecs_builtin; i++) 1247 link_es(&list, &execsw_builtin[i]); 1248 1249 /* Add dynamically loaded entries */ 1250 es_sz = nexecs_builtin; 1251 LIST_FOREACH(e2, &ex_head, ex_list) { 1252 link_es(&list, e2->es); 1253 es_sz++; 1254 } 1255 1256 /* 1257 * Now that we have sorted all execw entries, create new execsw[] 1258 * and free no longer needed memory in the process. 1259 */ 1260 new_es = malloc(es_sz * sizeof(struct execsw *), M_EXEC, M_WAITOK); 1261 for(i=0; list; i++) { 1262 new_es[i] = list->es; 1263 e1 = list->next; 1264 FREE(list, M_TEMP); 1265 list = e1; 1266 } 1267 1268 /* 1269 * New execsw[] array built, now replace old execsw[] and free 1270 * used memory. 1271 */ 1272 old_es = execsw; 1273 execsw = new_es; 1274 nexecs = es_sz; 1275 if (old_es) 1276 /*XXXUNCONST*/ 1277 free(__UNCONST(old_es), M_EXEC); 1278 1279 /* 1280 * Figure out the maximum size of an exec header. 1281 */ 1282 exec_maxhdrsz = 0; 1283 for (i = 0; i < nexecs; i++) { 1284 if (execsw[i]->es_hdrsz > exec_maxhdrsz) 1285 exec_maxhdrsz = execsw[i]->es_hdrsz; 1286 } 1287 1288 return 0; 1289 } 1290 #endif 1291 1292 #ifndef LKM 1293 /* 1294 * Simplified exec_init() for kernels without LKMs. Only initialize 1295 * exec_maxhdrsz and execsw[]. 1296 */ 1297 int 1298 exec_init(int init_boot) 1299 { 1300 int i; 1301 1302 #ifdef DIAGNOSTIC 1303 if (!init_boot) 1304 panic("exec_init(): called with init_boot == 0"); 1305 #endif 1306 1307 /* do one-time initializations */ 1308 nexecs = nexecs_builtin; 1309 execsw = malloc(nexecs*sizeof(struct execsw *), M_EXEC, M_WAITOK); 1310 1311 /* 1312 * Fill in execsw[] and figure out the maximum size of an exec header. 1313 */ 1314 exec_maxhdrsz = 0; 1315 for(i=0; i < nexecs; i++) { 1316 execsw[i] = &execsw_builtin[i]; 1317 if (execsw_builtin[i].es_hdrsz > exec_maxhdrsz) 1318 exec_maxhdrsz = execsw_builtin[i].es_hdrsz; 1319 } 1320 1321 return 0; 1322 1323 } 1324 #endif /* !LKM */ 1325 1326 static int 1327 exec_sigcode_map(struct proc *p, const struct emul *e) 1328 { 1329 vaddr_t va; 1330 vsize_t sz; 1331 int error; 1332 struct uvm_object *uobj; 1333 1334 sz = (vaddr_t)e->e_esigcode - (vaddr_t)e->e_sigcode; 1335 1336 if (e->e_sigobject == NULL || sz == 0) { 1337 return 0; 1338 } 1339 1340 /* 1341 * If we don't have a sigobject for this emulation, create one. 1342 * 1343 * sigobject is an anonymous memory object (just like SYSV shared 1344 * memory) that we keep a permanent reference to and that we map 1345 * in all processes that need this sigcode. The creation is simple, 1346 * we create an object, add a permanent reference to it, map it in 1347 * kernel space, copy out the sigcode to it and unmap it. 1348 * We map it with PROT_READ|PROT_EXEC into the process just 1349 * the way sys_mmap() would map it. 1350 */ 1351 1352 uobj = *e->e_sigobject; 1353 if (uobj == NULL) { 1354 uobj = uao_create(sz, 0); 1355 (*uobj->pgops->pgo_reference)(uobj); 1356 va = vm_map_min(kernel_map); 1357 if ((error = uvm_map(kernel_map, &va, round_page(sz), 1358 uobj, 0, 0, 1359 UVM_MAPFLAG(UVM_PROT_RW, UVM_PROT_RW, 1360 UVM_INH_SHARE, UVM_ADV_RANDOM, 0)))) { 1361 printf("kernel mapping failed %d\n", error); 1362 (*uobj->pgops->pgo_detach)(uobj); 1363 return (error); 1364 } 1365 memcpy((void *)va, e->e_sigcode, sz); 1366 #ifdef PMAP_NEED_PROCWR 1367 pmap_procwr(&proc0, va, sz); 1368 #endif 1369 uvm_unmap(kernel_map, va, va + round_page(sz)); 1370 *e->e_sigobject = uobj; 1371 } 1372 1373 /* Just a hint to uvm_map where to put it. */ 1374 va = e->e_vm_default_addr(p, (vaddr_t)p->p_vmspace->vm_daddr, 1375 round_page(sz)); 1376 1377 #ifdef __alpha__ 1378 /* 1379 * Tru64 puts /sbin/loader at the end of user virtual memory, 1380 * which causes the above calculation to put the sigcode at 1381 * an invalid address. Put it just below the text instead. 1382 */ 1383 if (va == (vaddr_t)vm_map_max(&p->p_vmspace->vm_map)) { 1384 va = (vaddr_t)p->p_vmspace->vm_taddr - round_page(sz); 1385 } 1386 #endif 1387 1388 (*uobj->pgops->pgo_reference)(uobj); 1389 error = uvm_map(&p->p_vmspace->vm_map, &va, round_page(sz), 1390 uobj, 0, 0, 1391 UVM_MAPFLAG(UVM_PROT_RX, UVM_PROT_RX, UVM_INH_SHARE, 1392 UVM_ADV_RANDOM, 0)); 1393 if (error) { 1394 (*uobj->pgops->pgo_detach)(uobj); 1395 return (error); 1396 } 1397 p->p_sigctx.ps_sigcode = (void *)va; 1398 return (0); 1399 } 1400
Indexes created Mon Sep 22 21:09:42 GMT 2025