1 /*- 2 * Copyright (c) 1995-1996 S�ren Schmidt 3 * Copyright (c) 1996 Peter Wemm 4 * All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer 11 * in this position and unchanged. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. The name of the author may not be used to endorse or promote products 16 * derived from this software withough specific prior written permission 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 19 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 20 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 21 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 22 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 23 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 24 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 25 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 26 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 27 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 28 * 29 * $FreeBSD: src/sys/kern/imgact_elf.c,v 1.73.2.13 2002/12/28 19:49:41 dillon Exp $ 30 * $DragonFly: src/sys/kern/imgact_elf.c,v 1.17 2004/03/01 06:33:16 dillon Exp $ 31 */ 32 33 #include <sys/param.h> 34 #include <sys/exec.h> 35 #include <sys/fcntl.h> 36 #include <sys/file.h> 37 #include <sys/imgact.h> 38 #include <sys/imgact_elf.h> 39 #include <sys/kernel.h> 40 #include <sys/malloc.h> 41 #include <sys/mman.h> 42 #include <sys/systm.h> 43 #include <sys/proc.h> 44 #include <sys/namei.h> 45 #include <sys/pioctl.h> 46 #include <sys/procfs.h> 47 #include <sys/resourcevar.h> 48 #include <sys/signalvar.h> 49 #include <sys/stat.h> 50 #include <sys/syscall.h> 51 #include <sys/sysctl.h> 52 #include <sys/sysent.h> 53 #include <sys/vnode.h> 54 55 #include <vm/vm.h> 56 #include <vm/vm_kern.h> 57 #include <vm/vm_param.h> 58 #include <vm/pmap.h> 59 #include <sys/lock.h> 60 #include <vm/vm_map.h> 61 #include <vm/vm_object.h> 62 #include <vm/vm_extern.h> 63 64 #include <machine/elf.h> 65 #include <machine/md_var.h> 66 #include <sys/mount.h> 67 #include <sys/ckpt.h> 68 #define OLD_EI_BRAND 8 69 70 __ElfType(Brandinfo); 71 __ElfType(Auxargs); 72 73 static int elf_check_header (const Elf_Ehdr *hdr); 74 static int elf_freebsd_fixup (register_t **stack_base, 75 struct image_params *imgp); 76 static int elf_load_file (struct proc *p, const char *file, u_long *addr, 77 u_long *entry); 78 static int elf_load_section (struct proc *p, 79 struct vmspace *vmspace, struct vnode *vp, 80 vm_offset_t offset, caddr_t vmaddr, size_t memsz, size_t filsz, 81 vm_prot_t prot); 82 static int exec_elf_imgact (struct image_params *imgp); 83 84 static int elf_trace = 0; 85 SYSCTL_INT(_debug, OID_AUTO, elf_trace, CTLFLAG_RW, &elf_trace, 0, ""); 86 static int elf_legacy_coredump = 0; 87 SYSCTL_INT(_debug, OID_AUTO, elf_legacy_coredump, CTLFLAG_RW, 88 &elf_legacy_coredump, 0, ""); 89 90 static struct sysentvec elf_freebsd_sysvec = { 91 SYS_MAXSYSCALL, 92 sysent, 93 0, 94 0, 95 0, 96 0, 97 0, 98 0, 99 elf_freebsd_fixup, 100 sendsig, 101 sigcode, 102 &szsigcode, 103 0, 104 "FreeBSD ELF", 105 elf_coredump, 106 NULL, 107 MINSIGSTKSZ 108 }; 109 110 static Elf_Brandinfo freebsd_brand_info = { 111 ELFOSABI_FREEBSD, 112 "FreeBSD", 113 "", 114 "/usr/libexec/ld-elf.so.1", 115 &elf_freebsd_sysvec 116 }; 117 static Elf_Brandinfo *elf_brand_list[MAX_BRANDS] = { 118 &freebsd_brand_info, 119 NULL, NULL, NULL, 120 NULL, NULL, NULL, NULL 121 }; 122 123 int 124 elf_insert_brand_entry(Elf_Brandinfo *entry) 125 { 126 int i; 127 128 for (i=1; i<MAX_BRANDS; i++) { 129 if (elf_brand_list[i] == NULL) { 130 elf_brand_list[i] = entry; 131 break; 132 } 133 } 134 if (i == MAX_BRANDS) 135 return -1; 136 return 0; 137 } 138 139 int 140 elf_remove_brand_entry(Elf_Brandinfo *entry) 141 { 142 int i; 143 144 for (i=1; i<MAX_BRANDS; i++) { 145 if (elf_brand_list[i] == entry) { 146 elf_brand_list[i] = NULL; 147 break; 148 } 149 } 150 if (i == MAX_BRANDS) 151 return -1; 152 return 0; 153 } 154 155 int 156 elf_brand_inuse(Elf_Brandinfo *entry) 157 { 158 struct proc *p; 159 int rval = FALSE; 160 161 FOREACH_PROC_IN_SYSTEM(p) { 162 if (p->p_sysent == entry->sysvec) { 163 rval = TRUE; 164 break; 165 } 166 } 167 168 return (rval); 169 } 170 171 static int 172 elf_check_header(const Elf_Ehdr *hdr) 173 { 174 if (!IS_ELF(*hdr) || 175 hdr->e_ident[EI_CLASS] != ELF_TARG_CLASS || 176 hdr->e_ident[EI_DATA] != ELF_TARG_DATA || 177 hdr->e_ident[EI_VERSION] != EV_CURRENT) 178 return ENOEXEC; 179 180 if (!ELF_MACHINE_OK(hdr->e_machine)) 181 return ENOEXEC; 182 183 if (hdr->e_version != ELF_TARG_VER) 184 return ENOEXEC; 185 186 return 0; 187 } 188 189 static int 190 elf_load_section(struct proc *p, struct vmspace *vmspace, struct vnode *vp, 191 vm_offset_t offset, caddr_t vmaddr, size_t memsz, size_t filsz, 192 vm_prot_t prot) 193 { 194 size_t map_len; 195 vm_offset_t map_addr; 196 int error, rv, cow; 197 int count; 198 size_t copy_len; 199 vm_object_t object; 200 vm_offset_t file_addr; 201 vm_offset_t data_buf = 0; 202 203 VOP_GETVOBJECT(vp, &object); 204 error = 0; 205 206 /* 207 * It's necessary to fail if the filsz + offset taken from the 208 * header is greater than the actual file pager object's size. 209 * If we were to allow this, then the vm_map_find() below would 210 * walk right off the end of the file object and into the ether. 211 * 212 * While I'm here, might as well check for something else that 213 * is invalid: filsz cannot be greater than memsz. 214 */ 215 if ((off_t)filsz + offset > object->un_pager.vnp.vnp_size || 216 filsz > memsz) { 217 uprintf("elf_load_section: truncated ELF file\n"); 218 return (ENOEXEC); 219 } 220 221 map_addr = trunc_page((vm_offset_t)vmaddr); 222 file_addr = trunc_page(offset); 223 224 /* 225 * We have two choices. We can either clear the data in the last page 226 * of an oversized mapping, or we can start the anon mapping a page 227 * early and copy the initialized data into that first page. We 228 * choose the second.. 229 */ 230 if (memsz > filsz) 231 map_len = trunc_page(offset+filsz) - file_addr; 232 else 233 map_len = round_page(offset+filsz) - file_addr; 234 235 if (map_len != 0) { 236 vm_object_reference(object); 237 238 /* cow flags: don't dump readonly sections in core */ 239 cow = MAP_COPY_ON_WRITE | MAP_PREFAULT | 240 (prot & VM_PROT_WRITE ? 0 : MAP_DISABLE_COREDUMP); 241 242 count = vm_map_entry_reserve(MAP_RESERVE_COUNT); 243 vm_map_lock(&vmspace->vm_map); 244 rv = vm_map_insert(&vmspace->vm_map, &count, 245 object, 246 file_addr, /* file offset */ 247 map_addr, /* virtual start */ 248 map_addr + map_len,/* virtual end */ 249 prot, 250 VM_PROT_ALL, 251 cow); 252 vm_map_unlock(&vmspace->vm_map); 253 vm_map_entry_release(count); 254 if (rv != KERN_SUCCESS) { 255 vm_object_deallocate(object); 256 return EINVAL; 257 } 258 259 /* we can stop now if we've covered it all */ 260 if (memsz == filsz) { 261 return 0; 262 } 263 } 264 265 266 /* 267 * We have to get the remaining bit of the file into the first part 268 * of the oversized map segment. This is normally because the .data 269 * segment in the file is extended to provide bss. It's a neat idea 270 * to try and save a page, but it's a pain in the behind to implement. 271 */ 272 copy_len = (offset + filsz) - trunc_page(offset + filsz); 273 map_addr = trunc_page((vm_offset_t)vmaddr + filsz); 274 map_len = round_page((vm_offset_t)vmaddr + memsz) - map_addr; 275 276 /* This had damn well better be true! */ 277 if (map_len != 0) { 278 count = vm_map_entry_reserve(MAP_RESERVE_COUNT); 279 vm_map_lock(&vmspace->vm_map); 280 rv = vm_map_insert(&vmspace->vm_map, &count, 281 NULL, 0, 282 map_addr, map_addr + map_len, 283 VM_PROT_ALL, VM_PROT_ALL, 0); 284 vm_map_unlock(&vmspace->vm_map); 285 vm_map_entry_release(count); 286 if (rv != KERN_SUCCESS) { 287 return EINVAL; 288 } 289 } 290 291 if (copy_len != 0) { 292 vm_object_reference(object); 293 rv = vm_map_find(exec_map, 294 object, 295 trunc_page(offset + filsz), 296 &data_buf, 297 PAGE_SIZE, 298 TRUE, 299 VM_PROT_READ, 300 VM_PROT_ALL, 301 MAP_COPY_ON_WRITE | MAP_PREFAULT_PARTIAL); 302 if (rv != KERN_SUCCESS) { 303 vm_object_deallocate(object); 304 return EINVAL; 305 } 306 307 /* send the page fragment to user space */ 308 error = copyout((caddr_t)data_buf, (caddr_t)map_addr, copy_len); 309 vm_map_remove(exec_map, data_buf, data_buf + PAGE_SIZE); 310 if (error) { 311 return (error); 312 } 313 } 314 315 /* 316 * set it to the specified protection 317 */ 318 vm_map_protect(&vmspace->vm_map, map_addr, map_addr + map_len, prot, 319 FALSE); 320 321 return error; 322 } 323 324 /* 325 * Load the file "file" into memory. It may be either a shared object 326 * or an executable. 327 * 328 * The "addr" reference parameter is in/out. On entry, it specifies 329 * the address where a shared object should be loaded. If the file is 330 * an executable, this value is ignored. On exit, "addr" specifies 331 * where the file was actually loaded. 332 * 333 * The "entry" reference parameter is out only. On exit, it specifies 334 * the entry point for the loaded file. 335 */ 336 static int 337 elf_load_file(struct proc *p, const char *file, u_long *addr, u_long *entry) 338 { 339 struct { 340 struct nameidata nd; 341 struct vattr attr; 342 struct image_params image_params; 343 } *tempdata; 344 const Elf_Ehdr *hdr = NULL; 345 const Elf_Phdr *phdr = NULL; 346 struct nameidata *nd; 347 struct vmspace *vmspace = p->p_vmspace; 348 struct vattr *attr; 349 struct image_params *imgp; 350 vm_prot_t prot; 351 u_long rbase; 352 u_long base_addr = 0; 353 int error, i, numsegs; 354 struct thread *td = p->p_thread; 355 356 tempdata = malloc(sizeof(*tempdata), M_TEMP, M_WAITOK); 357 nd = &tempdata->nd; 358 attr = &tempdata->attr; 359 imgp = &tempdata->image_params; 360 361 /* 362 * Initialize part of the common data 363 */ 364 imgp->proc = p; 365 imgp->attr = attr; 366 imgp->firstpage = NULL; 367 imgp->image_header = (char *)kmem_alloc_wait(exec_map, PAGE_SIZE); 368 369 if (imgp->image_header == NULL) { 370 nd->ni_vp = NULL; 371 error = ENOMEM; 372 goto fail; 373 } 374 375 NDINIT(nd, NAMEI_LOOKUP, CNP_LOCKLEAF | CNP_FOLLOW, 376 UIO_SYSSPACE, file, td); 377 378 if ((error = namei(nd)) != 0) { 379 nd->ni_vp = NULL; 380 goto fail; 381 } 382 NDFREE(nd, NDF_ONLY_PNBUF); 383 imgp->vp = nd->ni_vp; 384 385 /* 386 * Check permissions, modes, uid, etc on the file, and "open" it. 387 */ 388 error = exec_check_permissions(imgp); 389 if (error) { 390 VOP_UNLOCK(nd->ni_vp, NULL, 0, td); 391 goto fail; 392 } 393 394 error = exec_map_first_page(imgp); 395 /* 396 * Also make certain that the interpreter stays the same, so set 397 * its VTEXT flag, too. 398 */ 399 if (error == 0) 400 nd->ni_vp->v_flag |= VTEXT; 401 VOP_UNLOCK(nd->ni_vp, NULL, 0, td); 402 if (error) 403 goto fail; 404 405 hdr = (const Elf_Ehdr *)imgp->image_header; 406 if ((error = elf_check_header(hdr)) != 0) 407 goto fail; 408 if (hdr->e_type == ET_DYN) 409 rbase = *addr; 410 else if (hdr->e_type == ET_EXEC) 411 rbase = 0; 412 else { 413 error = ENOEXEC; 414 goto fail; 415 } 416 417 /* Only support headers that fit within first page for now */ 418 if ((hdr->e_phoff > PAGE_SIZE) || 419 (hdr->e_phoff + hdr->e_phentsize * hdr->e_phnum) > PAGE_SIZE) { 420 error = ENOEXEC; 421 goto fail; 422 } 423 424 phdr = (const Elf_Phdr *)(imgp->image_header + hdr->e_phoff); 425 426 for (i = 0, numsegs = 0; i < hdr->e_phnum; i++) { 427 if (phdr[i].p_type == PT_LOAD) { /* Loadable segment */ 428 prot = 0; 429 if (phdr[i].p_flags & PF_X) 430 prot |= VM_PROT_EXECUTE; 431 if (phdr[i].p_flags & PF_W) 432 prot |= VM_PROT_WRITE; 433 if (phdr[i].p_flags & PF_R) 434 prot |= VM_PROT_READ; 435 436 error = elf_load_section( 437 p, vmspace, nd->ni_vp, 438 phdr[i].p_offset, 439 (caddr_t)phdr[i].p_vaddr + 440 rbase, 441 phdr[i].p_memsz, 442 phdr[i].p_filesz, prot); 443 if (error != 0) 444 goto fail; 445 /* 446 * Establish the base address if this is the 447 * first segment. 448 */ 449 if (numsegs == 0) 450 base_addr = trunc_page(phdr[i].p_vaddr + rbase); 451 numsegs++; 452 } 453 } 454 *addr = base_addr; 455 *entry=(unsigned long)hdr->e_entry + rbase; 456 457 fail: 458 if (imgp->firstpage) 459 exec_unmap_first_page(imgp); 460 if (imgp->image_header) 461 kmem_free_wakeup(exec_map, (vm_offset_t)imgp->image_header, 462 PAGE_SIZE); 463 if (nd->ni_vp) 464 vrele(nd->ni_vp); 465 466 free(tempdata, M_TEMP); 467 468 return error; 469 } 470 471 /* 472 * non static, as it can be overridden by start_init() 473 */ 474 int fallback_elf_brand = -1; 475 SYSCTL_INT(_kern, OID_AUTO, fallback_elf_brand, CTLFLAG_RW, 476 &fallback_elf_brand, -1, 477 "ELF brand of last resort"); 478 479 static int 480 exec_elf_imgact(struct image_params *imgp) 481 { 482 const Elf_Ehdr *hdr = (const Elf_Ehdr *) imgp->image_header; 483 const Elf_Phdr *phdr; 484 Elf_Auxargs *elf_auxargs = NULL; 485 struct vmspace *vmspace; 486 vm_prot_t prot; 487 u_long text_size = 0, data_size = 0, total_size = 0; 488 u_long text_addr = 0, data_addr = 0; 489 u_long seg_size, seg_addr; 490 u_long addr, entry = 0, proghdr = 0; 491 int error, i; 492 const char *interp = NULL; 493 Elf_Brandinfo *brand_info; 494 char *path; 495 lwkt_tokref ilock; 496 497 error = 0; 498 499 /* 500 * Do we have a valid ELF header ? 501 */ 502 if (elf_check_header(hdr) != 0 || hdr->e_type != ET_EXEC) 503 return -1; 504 505 /* 506 * From here on down, we return an errno, not -1, as we've 507 * detected an ELF file. 508 */ 509 510 if ((hdr->e_phoff > PAGE_SIZE) || 511 (hdr->e_phoff + hdr->e_phentsize * hdr->e_phnum) > PAGE_SIZE) { 512 /* Only support headers in first page for now */ 513 return ENOEXEC; 514 } 515 phdr = (const Elf_Phdr*)(imgp->image_header + hdr->e_phoff); 516 517 /* 518 * From this point on, we may have resources that need to be freed. 519 */ 520 521 exec_new_vmspace(imgp, NULL); 522 523 /* 524 * Yeah, I'm paranoid. There is every reason in the world to get 525 * VTEXT now since from here on out, there are places we can have 526 * a context switch. Better safe than sorry; I really don't want 527 * the file to change while it's being loaded. 528 */ 529 lwkt_gettoken(&ilock, imgp->vp->v_interlock); 530 imgp->vp->v_flag |= VTEXT; 531 lwkt_reltoken(&ilock); 532 533 vmspace = imgp->proc->p_vmspace; 534 535 for (i = 0; i < hdr->e_phnum; i++) { 536 switch(phdr[i].p_type) { 537 538 case PT_LOAD: /* Loadable segment */ 539 prot = 0; 540 if (phdr[i].p_flags & PF_X) 541 prot |= VM_PROT_EXECUTE; 542 if (phdr[i].p_flags & PF_W) 543 prot |= VM_PROT_WRITE; 544 if (phdr[i].p_flags & PF_R) 545 prot |= VM_PROT_READ; 546 547 if ((error = elf_load_section(imgp->proc, 548 vmspace, imgp->vp, 549 phdr[i].p_offset, 550 (caddr_t)phdr[i].p_vaddr, 551 phdr[i].p_memsz, 552 phdr[i].p_filesz, prot)) != 0) 553 goto fail; 554 555 seg_addr = trunc_page(phdr[i].p_vaddr); 556 seg_size = round_page(phdr[i].p_memsz + 557 phdr[i].p_vaddr - seg_addr); 558 559 /* 560 * Is this .text or .data? We can't use 561 * VM_PROT_WRITE or VM_PROT_EXEC, it breaks the 562 * alpha terribly and possibly does other bad 563 * things so we stick to the old way of figuring 564 * it out: If the segment contains the program 565 * entry point, it's a text segment, otherwise it 566 * is a data segment. 567 * 568 * Note that obreak() assumes that data_addr + 569 * data_size == end of data load area, and the ELF 570 * file format expects segments to be sorted by 571 * address. If multiple data segments exist, the 572 * last one will be used. 573 */ 574 if (hdr->e_entry >= phdr[i].p_vaddr && 575 hdr->e_entry < (phdr[i].p_vaddr + 576 phdr[i].p_memsz)) { 577 text_size = seg_size; 578 text_addr = seg_addr; 579 entry = (u_long)hdr->e_entry; 580 } else { 581 data_size = seg_size; 582 data_addr = seg_addr; 583 } 584 total_size += seg_size; 585 586 /* 587 * Check limits. It should be safe to check the 588 * limits after loading the segment since we do 589 * not actually fault in all the segment's pages. 590 */ 591 if (data_size > 592 imgp->proc->p_rlimit[RLIMIT_DATA].rlim_cur || 593 text_size > maxtsiz || 594 total_size > 595 imgp->proc->p_rlimit[RLIMIT_VMEM].rlim_cur) { 596 error = ENOMEM; 597 goto fail; 598 } 599 break; 600 case PT_INTERP: /* Path to interpreter */ 601 if (phdr[i].p_filesz > MAXPATHLEN || 602 phdr[i].p_offset + phdr[i].p_filesz > PAGE_SIZE) { 603 error = ENOEXEC; 604 goto fail; 605 } 606 interp = imgp->image_header + phdr[i].p_offset; 607 break; 608 case PT_PHDR: /* Program header table info */ 609 proghdr = phdr[i].p_vaddr; 610 break; 611 default: 612 break; 613 } 614 } 615 616 vmspace->vm_tsize = text_size >> PAGE_SHIFT; 617 vmspace->vm_taddr = (caddr_t)(uintptr_t)text_addr; 618 vmspace->vm_dsize = data_size >> PAGE_SHIFT; 619 vmspace->vm_daddr = (caddr_t)(uintptr_t)data_addr; 620 621 addr = ELF_RTLD_ADDR(vmspace); 622 623 imgp->entry_addr = entry; 624 625 brand_info = NULL; 626 627 /* We support three types of branding -- (1) the ELF EI_OSABI field 628 * that SCO added to the ELF spec, (2) FreeBSD 3.x's traditional string 629 * branding w/in the ELF header, and (3) path of the `interp_path' 630 * field. We should also look for an ".note.ABI-tag" ELF section now 631 * in all Linux ELF binaries, FreeBSD 4.1+, and some NetBSD ones. 632 */ 633 634 /* If the executable has a brand, search for it in the brand list. */ 635 if (brand_info == NULL) { 636 for (i = 0; i < MAX_BRANDS; i++) { 637 Elf_Brandinfo *bi = elf_brand_list[i]; 638 639 if (bi != NULL && 640 (hdr->e_ident[EI_OSABI] == bi->brand 641 || 0 == 642 strncmp((const char *)&hdr->e_ident[OLD_EI_BRAND], 643 bi->compat_3_brand, strlen(bi->compat_3_brand)))) { 644 brand_info = bi; 645 break; 646 } 647 } 648 } 649 650 /* Lacking a known brand, search for a recognized interpreter. */ 651 if (brand_info == NULL && interp != NULL) { 652 for (i = 0; i < MAX_BRANDS; i++) { 653 Elf_Brandinfo *bi = elf_brand_list[i]; 654 655 if (bi != NULL && 656 strcmp(interp, bi->interp_path) == 0) { 657 brand_info = bi; 658 break; 659 } 660 } 661 } 662 663 /* Lacking a recognized interpreter, try the default brand */ 664 if (brand_info == NULL) { 665 for (i = 0; i < MAX_BRANDS; i++) { 666 Elf_Brandinfo *bi = elf_brand_list[i]; 667 668 if (bi != NULL && fallback_elf_brand == bi->brand) { 669 brand_info = bi; 670 break; 671 } 672 } 673 } 674 675 if (brand_info == NULL) { 676 uprintf("ELF binary type \"%u\" not known.\n", 677 hdr->e_ident[EI_OSABI]); 678 error = ENOEXEC; 679 goto fail; 680 } 681 682 imgp->proc->p_sysent = brand_info->sysvec; 683 if (interp != NULL) { 684 path = malloc(MAXPATHLEN, M_TEMP, M_WAITOK); 685 snprintf(path, MAXPATHLEN, "%s%s", 686 brand_info->emul_path, interp); 687 if ((error = elf_load_file(imgp->proc, path, &addr, 688 &imgp->entry_addr)) != 0) { 689 if ((error = elf_load_file(imgp->proc, interp, &addr, 690 &imgp->entry_addr)) != 0) { 691 uprintf("ELF interpreter %s not found\n", path); 692 free(path, M_TEMP); 693 goto fail; 694 } 695 } 696 free(path, M_TEMP); 697 } 698 699 /* 700 * Construct auxargs table (used by the fixup routine) 701 */ 702 elf_auxargs = malloc(sizeof(Elf_Auxargs), M_TEMP, M_WAITOK); 703 elf_auxargs->execfd = -1; 704 elf_auxargs->phdr = proghdr; 705 elf_auxargs->phent = hdr->e_phentsize; 706 elf_auxargs->phnum = hdr->e_phnum; 707 elf_auxargs->pagesz = PAGE_SIZE; 708 elf_auxargs->base = addr; 709 elf_auxargs->flags = 0; 710 elf_auxargs->entry = entry; 711 elf_auxargs->trace = elf_trace; 712 713 imgp->auxargs = elf_auxargs; 714 imgp->interpreted = 0; 715 716 fail: 717 return error; 718 } 719 720 static int 721 elf_freebsd_fixup(register_t **stack_base, struct image_params *imgp) 722 { 723 Elf_Auxargs *args = (Elf_Auxargs *)imgp->auxargs; 724 register_t *pos; 725 726 pos = *stack_base + (imgp->args->argc + imgp->args->envc + 2); 727 728 if (args->trace) { 729 AUXARGS_ENTRY(pos, AT_DEBUG, 1); 730 } 731 if (args->execfd != -1) { 732 AUXARGS_ENTRY(pos, AT_EXECFD, args->execfd); 733 } 734 AUXARGS_ENTRY(pos, AT_PHDR, args->phdr); 735 AUXARGS_ENTRY(pos, AT_PHENT, args->phent); 736 AUXARGS_ENTRY(pos, AT_PHNUM, args->phnum); 737 AUXARGS_ENTRY(pos, AT_PAGESZ, args->pagesz); 738 AUXARGS_ENTRY(pos, AT_FLAGS, args->flags); 739 AUXARGS_ENTRY(pos, AT_ENTRY, args->entry); 740 AUXARGS_ENTRY(pos, AT_BASE, args->base); 741 AUXARGS_ENTRY(pos, AT_NULL, 0); 742 743 free(imgp->auxargs, M_TEMP); 744 imgp->auxargs = NULL; 745 746 (*stack_base)--; 747 suword(*stack_base, (long) imgp->args->argc); 748 return 0; 749 } 750 751 /* 752 * Code for generating ELF core dumps. 753 */ 754 755 typedef int (*segment_callback) (vm_map_entry_t, void *); 756 757 /* Closure for cb_put_phdr(). */ 758 struct phdr_closure { 759 Elf_Phdr *phdr; /* Program header to fill in (incremented) */ 760 Elf_Phdr *phdr_max; /* Pointer bound for error check */ 761 Elf_Off offset; /* Offset of segment in core file */ 762 }; 763 764 /* Closure for cb_size_segment(). */ 765 struct sseg_closure { 766 int count; /* Count of writable segments. */ 767 size_t vsize; /* Total size of all writable segments. */ 768 }; 769 770 /* Closure for cb_put_fp(). */ 771 struct fp_closure { 772 struct vn_hdr *vnh; 773 struct vn_hdr *vnh_max; 774 int count; 775 struct stat *sb; 776 }; 777 778 typedef struct elf_buf { 779 char *buf; 780 size_t off; 781 size_t off_max; 782 } *elf_buf_t; 783 784 static void *target_reserve(elf_buf_t target, size_t bytes, int *error); 785 786 static int cb_put_phdr (vm_map_entry_t, void *); 787 static int cb_size_segment (vm_map_entry_t, void *); 788 static int cb_fpcount_segment(vm_map_entry_t, void *); 789 static int cb_put_fp(vm_map_entry_t, void *); 790 791 792 static int each_segment (struct proc *, segment_callback, void *, int); 793 static int elf_corehdr (struct proc *, struct file *, struct ucred *, 794 int, elf_buf_t); 795 static int elf_puthdr (struct proc *, elf_buf_t, const prstatus_t *, 796 const prfpregset_t *, const prpsinfo_t *, int); 797 static int elf_putnote (elf_buf_t, const char *, int, const void *, size_t); 798 799 static int elf_putsigs(struct proc *, elf_buf_t); 800 static int elf_puttextvp(struct proc *, elf_buf_t); 801 static int elf_putfiles(struct proc *, elf_buf_t); 802 803 extern int osreldate; 804 805 int 806 elf_coredump(struct proc *p, struct vnode *vp, off_t limit) 807 { 808 struct file *fp; 809 int error; 810 811 if ((error = falloc(NULL, &fp, NULL)) != 0) 812 return (error); 813 fsetcred(fp, p->p_ucred); 814 815 fp->f_data = (caddr_t)vp; 816 fp->f_flag = O_CREAT|O_WRONLY|O_NOFOLLOW; 817 fp->f_ops = &vnops; 818 fp->f_type = DTYPE_VNODE; 819 VOP_UNLOCK(vp, NULL, 0, p->p_thread); 820 821 error = generic_elf_coredump(p, fp, limit); 822 823 fp->f_data = NULL; 824 fp->f_flag = 0; 825 fp->f_ops = &badfileops; 826 fp->f_type = 0; 827 fdrop(fp, p->p_thread); 828 return (error); 829 } 830 831 int 832 generic_elf_coredump(struct proc *p, struct file *fp, off_t limit) 833 { 834 struct ucred *cred = p->p_ucred; 835 int error = 0; 836 struct sseg_closure seginfo; 837 struct elf_buf target; 838 839 if (!fp) 840 printf("can't dump core - null fp\n"); 841 842 /* 843 * Size the program segments 844 */ 845 seginfo.count = 0; 846 seginfo.vsize = 0; 847 each_segment(p, cb_size_segment, &seginfo, 1); 848 849 /* 850 * Calculate the size of the core file header area by making 851 * a dry run of generating it. Nothing is written, but the 852 * size is calculated. 853 */ 854 bzero(&target, sizeof(target)); 855 elf_puthdr(p, &target, NULL, NULL, NULL, seginfo.count); 856 857 if (target.off + seginfo.vsize >= limit) 858 return (EFAULT); 859 860 /* 861 * Allocate memory for building the header, fill it up, 862 * and write it out. 863 */ 864 target.off_max = target.off; 865 target.off = 0; 866 target.buf = malloc(target.off_max, M_TEMP, M_WAITOK|M_ZERO); 867 868 if (target.buf == NULL) 869 return EINVAL; 870 error = elf_corehdr(p, fp, cred, seginfo.count, &target); 871 872 /* Write the contents of all of the writable segments. */ 873 if (error == 0) { 874 Elf_Phdr *php; 875 int i; 876 int nbytes; 877 878 php = (Elf_Phdr *)(target.buf + sizeof(Elf_Ehdr)) + 1; 879 for (i = 0; i < seginfo.count; i++) { 880 error = fp_write(fp, (caddr_t)php->p_vaddr, 881 php->p_filesz, &nbytes); 882 if (error != 0) 883 break; 884 php++; 885 } 886 } 887 free(target.buf, M_TEMP); 888 889 return error; 890 } 891 892 /* 893 * A callback for each_segment() to write out the segment's 894 * program header entry. 895 */ 896 static int 897 cb_put_phdr(vm_map_entry_t entry, void *closure) 898 { 899 struct phdr_closure *phc = closure; 900 Elf_Phdr *phdr = phc->phdr; 901 902 if (phc->phdr == phc->phdr_max) 903 return EINVAL; 904 905 phc->offset = round_page(phc->offset); 906 907 phdr->p_type = PT_LOAD; 908 phdr->p_offset = phc->offset; 909 phdr->p_vaddr = entry->start; 910 phdr->p_paddr = 0; 911 phdr->p_filesz = phdr->p_memsz = entry->end - entry->start; 912 phdr->p_align = PAGE_SIZE; 913 phdr->p_flags = 0; 914 if (entry->protection & VM_PROT_READ) 915 phdr->p_flags |= PF_R; 916 if (entry->protection & VM_PROT_WRITE) 917 phdr->p_flags |= PF_W; 918 if (entry->protection & VM_PROT_EXECUTE) 919 phdr->p_flags |= PF_X; 920 921 phc->offset += phdr->p_filesz; 922 ++phc->phdr; 923 return 0; 924 } 925 926 /* 927 * A callback for each_writable_segment() to gather information about 928 * the number of segments and their total size. 929 */ 930 static int 931 cb_size_segment(vm_map_entry_t entry, void *closure) 932 { 933 struct sseg_closure *ssc = closure; 934 935 ++ssc->count; 936 ssc->vsize += entry->end - entry->start; 937 return 0; 938 } 939 940 /* 941 * A callback for each_segment() to gather information about 942 * the number of text segments. 943 */ 944 static int 945 cb_fpcount_segment(vm_map_entry_t entry, void *closure) 946 { 947 int *count = closure; 948 if (entry->object.vm_object->type == OBJT_VNODE) 949 ++*count; 950 return 0; 951 } 952 953 static int 954 cb_put_fp(vm_map_entry_t entry, void *closure) 955 { 956 struct fp_closure *fpc = closure; 957 struct vn_hdr *vnh = fpc->vnh; 958 Elf_Phdr *phdr = &vnh->vnh_phdr; 959 struct vnode *vp; 960 int error; 961 962 if (entry->object.vm_object->type == OBJT_VNODE) { 963 if (vnh == fpc->vnh_max) 964 return EINVAL; 965 vp = (struct vnode *)entry->object.vm_object->handle; 966 967 if (vp->v_mount) 968 vnh->vnh_fh.fh_fsid = vp->v_mount->mnt_stat.f_fsid; 969 error = VFS_VPTOFH(vp, &vnh->vnh_fh.fh_fid); 970 if (error) 971 return error; 972 973 phdr->p_type = PT_LOAD; 974 phdr->p_offset = 0; /* not written to core */ 975 phdr->p_vaddr = entry->start; 976 phdr->p_paddr = 0; 977 phdr->p_filesz = phdr->p_memsz = entry->end - entry->start; 978 phdr->p_align = PAGE_SIZE; 979 phdr->p_flags = 0; 980 if (entry->protection & VM_PROT_READ) 981 phdr->p_flags |= PF_R; 982 if (entry->protection & VM_PROT_WRITE) 983 phdr->p_flags |= PF_W; 984 if (entry->protection & VM_PROT_EXECUTE) 985 phdr->p_flags |= PF_X; 986 ++fpc->vnh; 987 ++fpc->count; 988 } 989 return 0; 990 } 991 992 /* 993 * For each writable segment in the process's memory map, call the given 994 * function with a pointer to the map entry and some arbitrary 995 * caller-supplied data. 996 */ 997 static int 998 each_segment(struct proc *p, segment_callback func, void *closure, int writable) 999 { 1000 int error = 0; 1001 vm_map_t map = &p->p_vmspace->vm_map; 1002 vm_map_entry_t entry; 1003 1004 for (entry = map->header.next; error == 0 && entry != &map->header; 1005 entry = entry->next) { 1006 vm_object_t obj; 1007 1008 /* 1009 * Don't dump inaccessible mappings, deal with legacy 1010 * coredump mode. 1011 * 1012 * Note that read-only segments related to the elf binary 1013 * are marked MAP_ENTRY_NOCOREDUMP now so we no longer 1014 * need to arbitrarily ignore such segments. 1015 */ 1016 if (elf_legacy_coredump) { 1017 if (writable && (entry->protection & VM_PROT_RW) != VM_PROT_RW) 1018 continue; 1019 } else { 1020 if (writable && (entry->protection & VM_PROT_ALL) == 0) 1021 continue; 1022 } 1023 1024 /* 1025 * Dont include memory segment in the coredump if 1026 * MAP_NOCORE is set in mmap(2) or MADV_NOCORE in 1027 * madvise(2). Do not dump submaps (i.e. parts of the 1028 * kernel map). 1029 */ 1030 if (writable && entry->eflags & (MAP_ENTRY_NOCOREDUMP|MAP_ENTRY_IS_SUB_MAP)) 1031 continue; 1032 1033 if ((obj = entry->object.vm_object) == NULL) 1034 continue; 1035 1036 /* Find the deepest backing object. */ 1037 while (obj->backing_object != NULL) 1038 obj = obj->backing_object; 1039 1040 /* Ignore memory-mapped devices and such things. */ 1041 if (obj->type != OBJT_DEFAULT && 1042 obj->type != OBJT_SWAP && 1043 obj->type != OBJT_VNODE) 1044 continue; 1045 1046 error = (*func)(entry, closure); 1047 } 1048 return error; 1049 } 1050 1051 static 1052 void * 1053 target_reserve(elf_buf_t target, size_t bytes, int *error) 1054 { 1055 void *res = NULL; 1056 1057 if (target->buf) { 1058 if (target->off + bytes > target->off_max) 1059 *error = EINVAL; 1060 else 1061 res = target->buf + target->off; 1062 } 1063 target->off += bytes; 1064 return (res); 1065 } 1066 1067 /* 1068 * Write the core file header to the file, including padding up to 1069 * the page boundary. 1070 */ 1071 static int 1072 elf_corehdr(struct proc *p, struct file *fp, struct ucred *cred, int numsegs, 1073 elf_buf_t target) 1074 { 1075 struct { 1076 prstatus_t status; 1077 prfpregset_t fpregset; 1078 prpsinfo_t psinfo; 1079 } *tempdata; 1080 int error; 1081 prstatus_t *status; 1082 prfpregset_t *fpregset; 1083 prpsinfo_t *psinfo; 1084 int nbytes; 1085 tempdata = malloc(sizeof(*tempdata), M_TEMP, M_ZERO | M_WAITOK); 1086 status = &tempdata->status; 1087 fpregset = &tempdata->fpregset; 1088 psinfo = &tempdata->psinfo; 1089 1090 /* Gather the information for the header. */ 1091 status->pr_version = PRSTATUS_VERSION; 1092 status->pr_statussz = sizeof(prstatus_t); 1093 status->pr_gregsetsz = sizeof(gregset_t); 1094 status->pr_fpregsetsz = sizeof(fpregset_t); 1095 status->pr_osreldate = osreldate; 1096 status->pr_cursig = p->p_sig; 1097 status->pr_pid = p->p_pid; 1098 fill_regs(p, &status->pr_reg); 1099 1100 fill_fpregs(p, fpregset); 1101 1102 psinfo->pr_version = PRPSINFO_VERSION; 1103 psinfo->pr_psinfosz = sizeof(prpsinfo_t); 1104 strncpy(psinfo->pr_fname, p->p_comm, sizeof(psinfo->pr_fname) - 1); 1105 1106 /* XXX - We don't fill in the command line arguments properly yet. */ 1107 strncpy(psinfo->pr_psargs, p->p_comm, PRARGSZ); 1108 1109 /* Fill in the header. */ 1110 error = elf_puthdr(p, target, status, fpregset, psinfo, numsegs); 1111 1112 free(tempdata, M_TEMP); 1113 1114 /* Write it to the core file. */ 1115 if (error == 0) 1116 error = fp_write(fp, target->buf, target->off, &nbytes); 1117 return error; 1118 } 1119 1120 static int 1121 elf_puthdr(struct proc *p, elf_buf_t target, const prstatus_t *status, 1122 const prfpregset_t *fpregset, const prpsinfo_t *psinfo, int numsegs) 1123 { 1124 int error = 0; 1125 size_t phoff; 1126 size_t noteoff; 1127 size_t notesz; 1128 Elf_Ehdr *ehdr; 1129 Elf_Phdr *phdr; 1130 1131 ehdr = target_reserve(target, sizeof(Elf_Ehdr), &error); 1132 1133 phoff = target->off; 1134 phdr = target_reserve(target, (numsegs + 1) * sizeof(Elf_Phdr), &error); 1135 1136 noteoff = target->off; 1137 if (error == 0) { 1138 error = elf_putnote(target, "FreeBSD", NT_PRSTATUS, 1139 status, sizeof *status); 1140 } 1141 if (error == 0) { 1142 error = elf_putnote(target, "FreeBSD", NT_FPREGSET, 1143 fpregset, sizeof *fpregset); 1144 } 1145 if (error == 0) { 1146 error = elf_putnote(target, "FreeBSD", NT_PRPSINFO, 1147 psinfo, sizeof *psinfo); 1148 } 1149 notesz = target->off - noteoff; 1150 1151 /* 1152 * put extra cruft for dumping process state here 1153 * - we really want it be before all the program 1154 * mappings 1155 * - we just need to update the offset accordingly 1156 * and GDB will be none the wiser. 1157 */ 1158 if (error == 0) 1159 error = elf_puttextvp(p, target); 1160 if (error == 0) 1161 error = elf_putsigs(p, target); 1162 if (error == 0) 1163 error = elf_putfiles(p, target); 1164 1165 /* 1166 * Align up to a page boundary for the program segments. The 1167 * actual data will be written to the outptu file, not to elf_buf_t, 1168 * so we do not have to do any further bounds checking. 1169 */ 1170 target->off = round_page(target->off); 1171 if (error == 0 && ehdr != NULL) { 1172 /* 1173 * Fill in the ELF header. 1174 */ 1175 ehdr->e_ident[EI_MAG0] = ELFMAG0; 1176 ehdr->e_ident[EI_MAG1] = ELFMAG1; 1177 ehdr->e_ident[EI_MAG2] = ELFMAG2; 1178 ehdr->e_ident[EI_MAG3] = ELFMAG3; 1179 ehdr->e_ident[EI_CLASS] = ELF_CLASS; 1180 ehdr->e_ident[EI_DATA] = ELF_DATA; 1181 ehdr->e_ident[EI_VERSION] = EV_CURRENT; 1182 ehdr->e_ident[EI_OSABI] = ELFOSABI_FREEBSD; 1183 ehdr->e_ident[EI_ABIVERSION] = 0; 1184 ehdr->e_ident[EI_PAD] = 0; 1185 ehdr->e_type = ET_CORE; 1186 ehdr->e_machine = ELF_ARCH; 1187 ehdr->e_version = EV_CURRENT; 1188 ehdr->e_entry = 0; 1189 ehdr->e_phoff = phoff; 1190 ehdr->e_flags = 0; 1191 ehdr->e_ehsize = sizeof(Elf_Ehdr); 1192 ehdr->e_phentsize = sizeof(Elf_Phdr); 1193 ehdr->e_phnum = numsegs + 1; 1194 ehdr->e_shentsize = sizeof(Elf_Shdr); 1195 ehdr->e_shnum = 0; 1196 ehdr->e_shstrndx = SHN_UNDEF; 1197 } 1198 if (error == 0 && phdr != NULL) { 1199 /* 1200 * Fill in the program header entries. 1201 */ 1202 struct phdr_closure phc; 1203 1204 /* The note segement. */ 1205 phdr->p_type = PT_NOTE; 1206 phdr->p_offset = noteoff; 1207 phdr->p_vaddr = 0; 1208 phdr->p_paddr = 0; 1209 phdr->p_filesz = notesz; 1210 phdr->p_memsz = 0; 1211 phdr->p_flags = 0; 1212 phdr->p_align = 0; 1213 ++phdr; 1214 1215 /* All the writable segments from the program. */ 1216 phc.phdr = phdr; 1217 phc.phdr_max = phdr + numsegs; 1218 phc.offset = target->off; 1219 each_segment(p, cb_put_phdr, &phc, 1); 1220 } 1221 return (error); 1222 } 1223 1224 static int 1225 elf_putnote(elf_buf_t target, const char *name, int type, 1226 const void *desc, size_t descsz) 1227 { 1228 int error = 0; 1229 char *dst; 1230 Elf_Note note; 1231 1232 note.n_namesz = strlen(name) + 1; 1233 note.n_descsz = descsz; 1234 note.n_type = type; 1235 dst = target_reserve(target, sizeof(note), &error); 1236 if (dst != NULL) 1237 bcopy(¬e, dst, sizeof note); 1238 dst = target_reserve(target, note.n_namesz, &error); 1239 if (dst != NULL) 1240 bcopy(name, dst, note.n_namesz); 1241 target->off = roundup2(target->off, sizeof(Elf_Size)); 1242 dst = target_reserve(target, note.n_descsz, &error); 1243 if (dst != NULL) 1244 bcopy(desc, dst, note.n_descsz); 1245 target->off = roundup2(target->off, sizeof(Elf_Size)); 1246 return(error); 1247 } 1248 1249 1250 static int 1251 elf_putsigs(struct proc *p, elf_buf_t target) 1252 { 1253 int error = 0; 1254 struct ckpt_siginfo *csi; 1255 1256 csi = target_reserve(target, sizeof(struct ckpt_siginfo), &error); 1257 if (csi) { 1258 csi->csi_ckptpisz = sizeof(struct ckpt_siginfo); 1259 bcopy(p->p_procsig, &csi->csi_procsig, sizeof(struct procsig)); 1260 bcopy(p->p_procsig->ps_sigacts, &csi->csi_sigacts, sizeof(struct sigacts)); 1261 bcopy(&p->p_realtimer, &csi->csi_itimerval, sizeof(struct itimerval)); 1262 csi->csi_sigparent = p->p_sigparent; 1263 } 1264 return(error); 1265 } 1266 1267 static int 1268 elf_putfiles(struct proc *p, elf_buf_t target) 1269 { 1270 int error = 0; 1271 int i; 1272 struct ckpt_filehdr *cfh = NULL; 1273 struct ckpt_fileinfo *cfi; 1274 struct file *fp; 1275 struct vnode *vp; 1276 /* 1277 * the duplicated loop is gross, but it was the only way 1278 * to eliminate uninitialized variable warnings 1279 */ 1280 cfh = target_reserve(target, sizeof(struct ckpt_filehdr), &error); 1281 if (cfh) { 1282 cfh->cfh_nfiles = 0; 1283 } 1284 1285 /* 1286 * ignore STDIN/STDERR/STDOUT 1287 */ 1288 for (i = 3; error == 0 && i < p->p_fd->fd_nfiles; i++) { 1289 if ((fp = p->p_fd->fd_ofiles[i]) == NULL) 1290 continue; 1291 if (fp->f_type != DTYPE_VNODE) 1292 continue; 1293 cfi = target_reserve(target, sizeof(struct ckpt_fileinfo), &error); 1294 if (cfi) { 1295 cfi->cfi_index = -1; 1296 vp = (struct vnode *)fp->f_data; 1297 /* 1298 * it looks like a bug in ptrace is marking 1299 * a non-vnode as a vnode - until we find the 1300 * root cause this will at least prevent 1301 * further panics from truss 1302 */ 1303 if (vp == NULL || vp->v_mount == NULL) 1304 continue; 1305 cfh->cfh_nfiles++; 1306 cfi->cfi_index = i; 1307 cfi->cfi_flags = fp->f_flag; 1308 cfi->cfi_offset = fp->f_offset; 1309 cfi->cfi_fh.fh_fsid = vp->v_mount->mnt_stat.f_fsid; 1310 error = VFS_VPTOFH(vp, &cfi->cfi_fh.fh_fid); 1311 } 1312 } 1313 return(error); 1314 } 1315 1316 static int 1317 elf_puttextvp(struct proc *p, elf_buf_t target) 1318 { 1319 int error = 0; 1320 int *vn_count; 1321 struct fp_closure fpc; 1322 struct ckpt_vminfo *vminfo; 1323 1324 vminfo = target_reserve(target, sizeof(struct ckpt_vminfo), &error); 1325 if (vminfo != NULL) { 1326 vminfo->cvm_dsize = p->p_vmspace->vm_dsize; 1327 vminfo->cvm_tsize = p->p_vmspace->vm_tsize; 1328 vminfo->cvm_daddr = p->p_vmspace->vm_daddr; 1329 vminfo->cvm_taddr = p->p_vmspace->vm_taddr; 1330 } 1331 1332 fpc.count = 0; 1333 vn_count = target_reserve(target, sizeof(int), &error); 1334 if (target->buf != NULL) { 1335 fpc.vnh = (struct vn_hdr *)(target->buf + target->off); 1336 fpc.vnh_max = fpc.vnh + 1337 (target->off_max - target->off) / sizeof(struct vn_hdr); 1338 error = each_segment(p, cb_put_fp, &fpc, 0); 1339 if (vn_count) 1340 *vn_count = fpc.count; 1341 } else { 1342 error = each_segment(p, cb_fpcount_segment, &fpc.count, 0); 1343 } 1344 target->off += fpc.count * sizeof(struct vn_hdr); 1345 return(error); 1346 } 1347 1348 1349 /* 1350 * Tell kern_execve.c about it, with a little help from the linker. 1351 */ 1352 static struct execsw elf_execsw = {exec_elf_imgact, "ELF"}; 1353 EXEC_SET(elf, elf_execsw); 1354