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 1.24 2004/11/18 13:09:30 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/nlookup.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 -1, 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 hdr->e_phentsize != sizeof(Elf_Phdr) || 179 hdr->e_ehsize != sizeof(Elf_Ehdr) || 180 hdr->e_version != ELF_TARG_VER) 181 return ENOEXEC; 182 183 if (!ELF_MACHINE_OK(hdr->e_machine)) 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 nlookupdata 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 nlookupdata *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 = NULL; 368 imgp->vp = NULL; 369 370 error = nlookup_init(nd, file, UIO_SYSSPACE, NLC_FOLLOW); 371 if (error == 0) 372 error = nlookup(nd); 373 if (error == 0) 374 error = cache_vget(nd->nl_ncp, nd->nl_cred, LK_EXCLUSIVE, &imgp->vp); 375 nlookup_done(nd); 376 if (error) 377 goto fail; 378 379 /* 380 * Check permissions, modes, uid, etc on the file, and "open" it. 381 */ 382 error = exec_check_permissions(imgp); 383 if (error) { 384 VOP_UNLOCK(imgp->vp, 0, td); 385 goto fail; 386 } 387 388 error = exec_map_first_page(imgp); 389 /* 390 * Also make certain that the interpreter stays the same, so set 391 * its VTEXT flag, too. 392 */ 393 if (error == 0) 394 imgp->vp->v_flag |= VTEXT; 395 VOP_UNLOCK(imgp->vp, 0, td); 396 if (error) 397 goto fail; 398 399 hdr = (const Elf_Ehdr *)imgp->image_header; 400 if ((error = elf_check_header(hdr)) != 0) 401 goto fail; 402 if (hdr->e_type == ET_DYN) 403 rbase = *addr; 404 else if (hdr->e_type == ET_EXEC) 405 rbase = 0; 406 else { 407 error = ENOEXEC; 408 goto fail; 409 } 410 411 /* Only support headers that fit within first page for now 412 * (multiplication of two Elf_Half fields will not overflow) */ 413 if ((hdr->e_phoff > PAGE_SIZE) || 414 (hdr->e_phentsize * hdr->e_phnum) > PAGE_SIZE - hdr->e_phoff) { 415 error = ENOEXEC; 416 goto fail; 417 } 418 419 phdr = (const Elf_Phdr *)(imgp->image_header + hdr->e_phoff); 420 421 for (i = 0, numsegs = 0; i < hdr->e_phnum; i++) { 422 if (phdr[i].p_type == PT_LOAD) { /* Loadable segment */ 423 prot = 0; 424 if (phdr[i].p_flags & PF_X) 425 prot |= VM_PROT_EXECUTE; 426 if (phdr[i].p_flags & PF_W) 427 prot |= VM_PROT_WRITE; 428 if (phdr[i].p_flags & PF_R) 429 prot |= VM_PROT_READ; 430 431 error = elf_load_section( 432 p, vmspace, imgp->vp, 433 phdr[i].p_offset, 434 (caddr_t)phdr[i].p_vaddr + 435 rbase, 436 phdr[i].p_memsz, 437 phdr[i].p_filesz, prot); 438 if (error != 0) 439 goto fail; 440 /* 441 * Establish the base address if this is the 442 * first segment. 443 */ 444 if (numsegs == 0) 445 base_addr = trunc_page(phdr[i].p_vaddr + rbase); 446 numsegs++; 447 } 448 } 449 *addr = base_addr; 450 *entry=(unsigned long)hdr->e_entry + rbase; 451 452 fail: 453 if (imgp->firstpage) 454 exec_unmap_first_page(imgp); 455 if (imgp->vp) { 456 vrele(imgp->vp); 457 imgp->vp = NULL; 458 } 459 free(tempdata, M_TEMP); 460 461 return error; 462 } 463 464 /* 465 * non static, as it can be overridden by start_init() 466 */ 467 int fallback_elf_brand = -1; 468 SYSCTL_INT(_kern, OID_AUTO, fallback_elf_brand, CTLFLAG_RW, 469 &fallback_elf_brand, -1, 470 "ELF brand of last resort"); 471 472 static int 473 exec_elf_imgact(struct image_params *imgp) 474 { 475 const Elf_Ehdr *hdr = (const Elf_Ehdr *) imgp->image_header; 476 const Elf_Phdr *phdr; 477 Elf_Auxargs *elf_auxargs = NULL; 478 struct vmspace *vmspace; 479 vm_prot_t prot; 480 u_long text_size = 0, data_size = 0, total_size = 0; 481 u_long text_addr = 0, data_addr = 0; 482 u_long seg_size, seg_addr; 483 u_long addr, entry = 0, proghdr = 0; 484 int error, i; 485 const char *interp = NULL; 486 Elf_Brandinfo *brand_info; 487 char *path; 488 489 error = 0; 490 491 /* 492 * Do we have a valid ELF header ? 493 */ 494 if (elf_check_header(hdr) != 0 || hdr->e_type != ET_EXEC) 495 return -1; 496 497 /* 498 * From here on down, we return an errno, not -1, as we've 499 * detected an ELF file. 500 */ 501 502 if ((hdr->e_phoff > PAGE_SIZE) || 503 (hdr->e_phoff + hdr->e_phentsize * hdr->e_phnum) > PAGE_SIZE) { 504 /* Only support headers in first page for now */ 505 return ENOEXEC; 506 } 507 phdr = (const Elf_Phdr*)(imgp->image_header + hdr->e_phoff); 508 509 /* 510 * From this point on, we may have resources that need to be freed. 511 */ 512 513 exec_new_vmspace(imgp, NULL); 514 515 /* 516 * Yeah, I'm paranoid. There is every reason in the world to get 517 * VTEXT now since from here on out, there are places we can have 518 * a context switch. Better safe than sorry; I really don't want 519 * the file to change while it's being loaded. 520 */ 521 vsetflags(imgp->vp, VTEXT); 522 523 vmspace = imgp->proc->p_vmspace; 524 525 for (i = 0; i < hdr->e_phnum; i++) { 526 switch(phdr[i].p_type) { 527 528 case PT_LOAD: /* Loadable segment */ 529 prot = 0; 530 if (phdr[i].p_flags & PF_X) 531 prot |= VM_PROT_EXECUTE; 532 if (phdr[i].p_flags & PF_W) 533 prot |= VM_PROT_WRITE; 534 if (phdr[i].p_flags & PF_R) 535 prot |= VM_PROT_READ; 536 537 if ((error = elf_load_section(imgp->proc, 538 vmspace, imgp->vp, 539 phdr[i].p_offset, 540 (caddr_t)phdr[i].p_vaddr, 541 phdr[i].p_memsz, 542 phdr[i].p_filesz, prot)) != 0) 543 goto fail; 544 545 seg_addr = trunc_page(phdr[i].p_vaddr); 546 seg_size = round_page(phdr[i].p_memsz + 547 phdr[i].p_vaddr - seg_addr); 548 549 /* 550 * Is this .text or .data? We can't use 551 * VM_PROT_WRITE or VM_PROT_EXEC, it breaks the 552 * alpha terribly and possibly does other bad 553 * things so we stick to the old way of figuring 554 * it out: If the segment contains the program 555 * entry point, it's a text segment, otherwise it 556 * is a data segment. 557 * 558 * Note that obreak() assumes that data_addr + 559 * data_size == end of data load area, and the ELF 560 * file format expects segments to be sorted by 561 * address. If multiple data segments exist, the 562 * last one will be used. 563 */ 564 if (hdr->e_entry >= phdr[i].p_vaddr && 565 hdr->e_entry < (phdr[i].p_vaddr + 566 phdr[i].p_memsz)) { 567 text_size = seg_size; 568 text_addr = seg_addr; 569 entry = (u_long)hdr->e_entry; 570 } else { 571 data_size = seg_size; 572 data_addr = seg_addr; 573 } 574 total_size += seg_size; 575 576 /* 577 * Check limits. It should be safe to check the 578 * limits after loading the segment since we do 579 * not actually fault in all the segment's pages. 580 */ 581 if (data_size > 582 imgp->proc->p_rlimit[RLIMIT_DATA].rlim_cur || 583 text_size > maxtsiz || 584 total_size > 585 imgp->proc->p_rlimit[RLIMIT_VMEM].rlim_cur) { 586 error = ENOMEM; 587 goto fail; 588 } 589 break; 590 case PT_INTERP: /* Path to interpreter */ 591 if (phdr[i].p_filesz > MAXPATHLEN || 592 phdr[i].p_offset + phdr[i].p_filesz > PAGE_SIZE) { 593 error = ENOEXEC; 594 goto fail; 595 } 596 interp = imgp->image_header + phdr[i].p_offset; 597 break; 598 case PT_PHDR: /* Program header table info */ 599 proghdr = phdr[i].p_vaddr; 600 break; 601 default: 602 break; 603 } 604 } 605 606 vmspace->vm_tsize = text_size >> PAGE_SHIFT; 607 vmspace->vm_taddr = (caddr_t)(uintptr_t)text_addr; 608 vmspace->vm_dsize = data_size >> PAGE_SHIFT; 609 vmspace->vm_daddr = (caddr_t)(uintptr_t)data_addr; 610 611 addr = ELF_RTLD_ADDR(vmspace); 612 613 imgp->entry_addr = entry; 614 615 brand_info = NULL; 616 617 /* We support three types of branding -- (1) the ELF EI_OSABI field 618 * that SCO added to the ELF spec, (2) FreeBSD 3.x's traditional string 619 * branding w/in the ELF header, and (3) path of the `interp_path' 620 * field. We should also look for an ".note.ABI-tag" ELF section now 621 * in all Linux ELF binaries, FreeBSD 4.1+, and some NetBSD ones. 622 */ 623 624 /* If the executable has a brand, search for it in the brand list. */ 625 if (brand_info == NULL) { 626 for (i = 0; i < MAX_BRANDS; i++) { 627 Elf_Brandinfo *bi = elf_brand_list[i]; 628 629 if (bi != NULL && 630 (hdr->e_ident[EI_OSABI] == bi->brand 631 || 0 == 632 strncmp((const char *)&hdr->e_ident[OLD_EI_BRAND], 633 bi->compat_3_brand, strlen(bi->compat_3_brand)))) { 634 brand_info = bi; 635 break; 636 } 637 } 638 } 639 640 /* Lacking a known brand, search for a recognized interpreter. */ 641 if (brand_info == NULL && interp != NULL) { 642 for (i = 0; i < MAX_BRANDS; i++) { 643 Elf_Brandinfo *bi = elf_brand_list[i]; 644 645 if (bi != NULL && 646 strcmp(interp, bi->interp_path) == 0) { 647 brand_info = bi; 648 break; 649 } 650 } 651 } 652 653 /* Lacking a recognized interpreter, try the default brand */ 654 if (brand_info == NULL) { 655 for (i = 0; i < MAX_BRANDS; i++) { 656 Elf_Brandinfo *bi = elf_brand_list[i]; 657 658 if (bi != NULL && fallback_elf_brand == bi->brand) { 659 brand_info = bi; 660 break; 661 } 662 } 663 } 664 665 if (brand_info == NULL) { 666 uprintf("ELF binary type \"%u\" not known.\n", 667 hdr->e_ident[EI_OSABI]); 668 error = ENOEXEC; 669 goto fail; 670 } 671 672 imgp->proc->p_sysent = brand_info->sysvec; 673 if (interp != NULL) { 674 path = malloc(MAXPATHLEN, M_TEMP, M_WAITOK); 675 snprintf(path, MAXPATHLEN, "%s%s", 676 brand_info->emul_path, interp); 677 if ((error = elf_load_file(imgp->proc, path, &addr, 678 &imgp->entry_addr)) != 0) { 679 if ((error = elf_load_file(imgp->proc, interp, &addr, 680 &imgp->entry_addr)) != 0) { 681 uprintf("ELF interpreter %s not found\n", path); 682 free(path, M_TEMP); 683 goto fail; 684 } 685 } 686 free(path, M_TEMP); 687 } 688 689 /* 690 * Construct auxargs table (used by the fixup routine) 691 */ 692 elf_auxargs = malloc(sizeof(Elf_Auxargs), M_TEMP, M_WAITOK); 693 elf_auxargs->execfd = -1; 694 elf_auxargs->phdr = proghdr; 695 elf_auxargs->phent = hdr->e_phentsize; 696 elf_auxargs->phnum = hdr->e_phnum; 697 elf_auxargs->pagesz = PAGE_SIZE; 698 elf_auxargs->base = addr; 699 elf_auxargs->flags = 0; 700 elf_auxargs->entry = entry; 701 elf_auxargs->trace = elf_trace; 702 703 imgp->auxargs = elf_auxargs; 704 imgp->interpreted = 0; 705 706 fail: 707 return error; 708 } 709 710 static int 711 elf_freebsd_fixup(register_t **stack_base, struct image_params *imgp) 712 { 713 Elf_Auxargs *args = (Elf_Auxargs *)imgp->auxargs; 714 register_t *pos; 715 716 pos = *stack_base + (imgp->args->argc + imgp->args->envc + 2); 717 718 if (args->trace) { 719 AUXARGS_ENTRY(pos, AT_DEBUG, 1); 720 } 721 if (args->execfd != -1) { 722 AUXARGS_ENTRY(pos, AT_EXECFD, args->execfd); 723 } 724 AUXARGS_ENTRY(pos, AT_PHDR, args->phdr); 725 AUXARGS_ENTRY(pos, AT_PHENT, args->phent); 726 AUXARGS_ENTRY(pos, AT_PHNUM, args->phnum); 727 AUXARGS_ENTRY(pos, AT_PAGESZ, args->pagesz); 728 AUXARGS_ENTRY(pos, AT_FLAGS, args->flags); 729 AUXARGS_ENTRY(pos, AT_ENTRY, args->entry); 730 AUXARGS_ENTRY(pos, AT_BASE, args->base); 731 AUXARGS_ENTRY(pos, AT_NULL, 0); 732 733 free(imgp->auxargs, M_TEMP); 734 imgp->auxargs = NULL; 735 736 (*stack_base)--; 737 suword(*stack_base, (long) imgp->args->argc); 738 return 0; 739 } 740 741 /* 742 * Code for generating ELF core dumps. 743 */ 744 745 typedef int (*segment_callback) (vm_map_entry_t, void *); 746 747 /* Closure for cb_put_phdr(). */ 748 struct phdr_closure { 749 Elf_Phdr *phdr; /* Program header to fill in (incremented) */ 750 Elf_Phdr *phdr_max; /* Pointer bound for error check */ 751 Elf_Off offset; /* Offset of segment in core file */ 752 }; 753 754 /* Closure for cb_size_segment(). */ 755 struct sseg_closure { 756 int count; /* Count of writable segments. */ 757 size_t vsize; /* Total size of all writable segments. */ 758 }; 759 760 /* Closure for cb_put_fp(). */ 761 struct fp_closure { 762 struct vn_hdr *vnh; 763 struct vn_hdr *vnh_max; 764 int count; 765 struct stat *sb; 766 }; 767 768 typedef struct elf_buf { 769 char *buf; 770 size_t off; 771 size_t off_max; 772 } *elf_buf_t; 773 774 static void *target_reserve(elf_buf_t target, size_t bytes, int *error); 775 776 static int cb_put_phdr (vm_map_entry_t, void *); 777 static int cb_size_segment (vm_map_entry_t, void *); 778 static int cb_fpcount_segment(vm_map_entry_t, void *); 779 static int cb_put_fp(vm_map_entry_t, void *); 780 781 782 static int each_segment (struct proc *, segment_callback, void *, int); 783 static int elf_corehdr (struct proc *, struct file *, struct ucred *, 784 int, elf_buf_t); 785 static int elf_puthdr (struct proc *, elf_buf_t, const prstatus_t *, 786 const prfpregset_t *, const prpsinfo_t *, int); 787 static int elf_putnote (elf_buf_t, const char *, int, const void *, size_t); 788 789 static int elf_putsigs(struct proc *, elf_buf_t); 790 static int elf_puttextvp(struct proc *, elf_buf_t); 791 static int elf_putfiles(struct proc *, elf_buf_t); 792 793 extern int osreldate; 794 795 int 796 elf_coredump(struct proc *p, struct vnode *vp, off_t limit) 797 { 798 struct file *fp; 799 int error; 800 801 if ((error = falloc(NULL, &fp, NULL)) != 0) 802 return (error); 803 fsetcred(fp, p->p_ucred); 804 805 /* 806 * XXX fixme. 807 */ 808 fp->f_data = (caddr_t)vp; 809 fp->f_flag = O_CREAT|O_WRONLY|O_NOFOLLOW; 810 fp->f_ops = &vnode_fileops; 811 fp->f_type = DTYPE_VNODE; 812 VOP_UNLOCK(vp, 0, p->p_thread); 813 814 error = generic_elf_coredump(p, fp, limit); 815 816 fp->f_data = NULL; 817 fp->f_flag = 0; 818 fp->f_ops = &badfileops; 819 fp->f_type = 0; 820 fdrop(fp, p->p_thread); 821 return (error); 822 } 823 824 int 825 generic_elf_coredump(struct proc *p, struct file *fp, off_t limit) 826 { 827 struct ucred *cred = p->p_ucred; 828 int error = 0; 829 struct sseg_closure seginfo; 830 struct elf_buf target; 831 832 if (!fp) 833 printf("can't dump core - null fp\n"); 834 835 /* 836 * Size the program segments 837 */ 838 seginfo.count = 0; 839 seginfo.vsize = 0; 840 each_segment(p, cb_size_segment, &seginfo, 1); 841 842 /* 843 * Calculate the size of the core file header area by making 844 * a dry run of generating it. Nothing is written, but the 845 * size is calculated. 846 */ 847 bzero(&target, sizeof(target)); 848 elf_puthdr(p, &target, NULL, NULL, NULL, seginfo.count); 849 850 if (target.off + seginfo.vsize >= limit) 851 return (EFAULT); 852 853 /* 854 * Allocate memory for building the header, fill it up, 855 * and write it out. 856 */ 857 target.off_max = target.off; 858 target.off = 0; 859 target.buf = malloc(target.off_max, M_TEMP, M_WAITOK|M_ZERO); 860 861 if (target.buf == NULL) 862 return EINVAL; 863 error = elf_corehdr(p, fp, cred, seginfo.count, &target); 864 865 /* Write the contents of all of the writable segments. */ 866 if (error == 0) { 867 Elf_Phdr *php; 868 int i; 869 int nbytes; 870 871 php = (Elf_Phdr *)(target.buf + sizeof(Elf_Ehdr)) + 1; 872 for (i = 0; i < seginfo.count; i++) { 873 error = fp_write(fp, (caddr_t)php->p_vaddr, 874 php->p_filesz, &nbytes); 875 if (error != 0) 876 break; 877 php++; 878 } 879 } 880 free(target.buf, M_TEMP); 881 882 return error; 883 } 884 885 /* 886 * A callback for each_segment() to write out the segment's 887 * program header entry. 888 */ 889 static int 890 cb_put_phdr(vm_map_entry_t entry, void *closure) 891 { 892 struct phdr_closure *phc = closure; 893 Elf_Phdr *phdr = phc->phdr; 894 895 if (phc->phdr == phc->phdr_max) 896 return EINVAL; 897 898 phc->offset = round_page(phc->offset); 899 900 phdr->p_type = PT_LOAD; 901 phdr->p_offset = phc->offset; 902 phdr->p_vaddr = entry->start; 903 phdr->p_paddr = 0; 904 phdr->p_filesz = phdr->p_memsz = entry->end - entry->start; 905 phdr->p_align = PAGE_SIZE; 906 phdr->p_flags = 0; 907 if (entry->protection & VM_PROT_READ) 908 phdr->p_flags |= PF_R; 909 if (entry->protection & VM_PROT_WRITE) 910 phdr->p_flags |= PF_W; 911 if (entry->protection & VM_PROT_EXECUTE) 912 phdr->p_flags |= PF_X; 913 914 phc->offset += phdr->p_filesz; 915 ++phc->phdr; 916 return 0; 917 } 918 919 /* 920 * A callback for each_writable_segment() to gather information about 921 * the number of segments and their total size. 922 */ 923 static int 924 cb_size_segment(vm_map_entry_t entry, void *closure) 925 { 926 struct sseg_closure *ssc = closure; 927 928 ++ssc->count; 929 ssc->vsize += entry->end - entry->start; 930 return 0; 931 } 932 933 /* 934 * A callback for each_segment() to gather information about 935 * the number of text segments. 936 */ 937 static int 938 cb_fpcount_segment(vm_map_entry_t entry, void *closure) 939 { 940 int *count = closure; 941 struct vnode *vp; 942 943 if (entry->object.vm_object->type == OBJT_VNODE) { 944 vp = (struct vnode *)entry->object.vm_object->handle; 945 if ((vp->v_flag & VCKPT) && curproc->p_textvp == vp) 946 return 0; 947 ++*count; 948 } 949 return 0; 950 } 951 952 static int 953 cb_put_fp(vm_map_entry_t entry, void *closure) 954 { 955 struct fp_closure *fpc = closure; 956 struct vn_hdr *vnh = fpc->vnh; 957 Elf_Phdr *phdr = &vnh->vnh_phdr; 958 struct vnode *vp; 959 int error; 960 961 /* 962 * If an entry represents a vnode then write out a file handle. 963 * 964 * If we are checkpointing a checkpoint-restored program we do 965 * NOT record the filehandle for the old checkpoint vnode (which 966 * is mapped all over the place). Instead we rely on the fact 967 * that a checkpoint-restored program does not mmap() the checkpt 968 * vnode NOCORE, so its contents will be written out to the 969 * checkpoint file itself. This is necessary because the 'old' 970 * checkpoint file is typically destroyed when a new one is created. 971 */ 972 if (entry->object.vm_object->type == OBJT_VNODE) { 973 vp = (struct vnode *)entry->object.vm_object->handle; 974 if ((vp->v_flag & VCKPT) && curproc->p_textvp == vp) 975 return 0; 976 if (vnh == fpc->vnh_max) 977 return EINVAL; 978 979 if (vp->v_mount) 980 vnh->vnh_fh.fh_fsid = vp->v_mount->mnt_stat.f_fsid; 981 error = VFS_VPTOFH(vp, &vnh->vnh_fh.fh_fid); 982 if (error) 983 return error; 984 985 phdr->p_type = PT_LOAD; 986 phdr->p_offset = 0; /* not written to core */ 987 phdr->p_vaddr = entry->start; 988 phdr->p_paddr = 0; 989 phdr->p_filesz = phdr->p_memsz = entry->end - entry->start; 990 phdr->p_align = PAGE_SIZE; 991 phdr->p_flags = 0; 992 if (entry->protection & VM_PROT_READ) 993 phdr->p_flags |= PF_R; 994 if (entry->protection & VM_PROT_WRITE) 995 phdr->p_flags |= PF_W; 996 if (entry->protection & VM_PROT_EXECUTE) 997 phdr->p_flags |= PF_X; 998 ++fpc->vnh; 999 ++fpc->count; 1000 } 1001 return 0; 1002 } 1003 1004 /* 1005 * For each writable segment in the process's memory map, call the given 1006 * function with a pointer to the map entry and some arbitrary 1007 * caller-supplied data. 1008 */ 1009 static int 1010 each_segment(struct proc *p, segment_callback func, void *closure, int writable) 1011 { 1012 int error = 0; 1013 vm_map_t map = &p->p_vmspace->vm_map; 1014 vm_map_entry_t entry; 1015 1016 for (entry = map->header.next; error == 0 && entry != &map->header; 1017 entry = entry->next) { 1018 vm_object_t obj; 1019 1020 /* 1021 * Don't dump inaccessible mappings, deal with legacy 1022 * coredump mode. 1023 * 1024 * Note that read-only segments related to the elf binary 1025 * are marked MAP_ENTRY_NOCOREDUMP now so we no longer 1026 * need to arbitrarily ignore such segments. 1027 */ 1028 if (elf_legacy_coredump) { 1029 if (writable && (entry->protection & VM_PROT_RW) != VM_PROT_RW) 1030 continue; 1031 } else { 1032 if (writable && (entry->protection & VM_PROT_ALL) == 0) 1033 continue; 1034 } 1035 1036 /* 1037 * Dont include memory segment in the coredump if 1038 * MAP_NOCORE is set in mmap(2) or MADV_NOCORE in 1039 * madvise(2). Do not dump submaps (i.e. parts of the 1040 * kernel map). 1041 */ 1042 if (writable && entry->eflags & (MAP_ENTRY_NOCOREDUMP|MAP_ENTRY_IS_SUB_MAP)) 1043 continue; 1044 1045 if ((obj = entry->object.vm_object) == NULL) 1046 continue; 1047 1048 /* Find the deepest backing object. */ 1049 while (obj->backing_object != NULL) 1050 obj = obj->backing_object; 1051 1052 /* Ignore memory-mapped devices and such things. */ 1053 if (obj->type != OBJT_DEFAULT && 1054 obj->type != OBJT_SWAP && 1055 obj->type != OBJT_VNODE) 1056 continue; 1057 1058 error = (*func)(entry, closure); 1059 } 1060 return error; 1061 } 1062 1063 static 1064 void * 1065 target_reserve(elf_buf_t target, size_t bytes, int *error) 1066 { 1067 void *res = NULL; 1068 1069 if (target->buf) { 1070 if (target->off + bytes > target->off_max) 1071 *error = EINVAL; 1072 else 1073 res = target->buf + target->off; 1074 } 1075 target->off += bytes; 1076 return (res); 1077 } 1078 1079 /* 1080 * Write the core file header to the file, including padding up to 1081 * the page boundary. 1082 */ 1083 static int 1084 elf_corehdr(struct proc *p, struct file *fp, struct ucred *cred, int numsegs, 1085 elf_buf_t target) 1086 { 1087 struct { 1088 prstatus_t status; 1089 prfpregset_t fpregset; 1090 prpsinfo_t psinfo; 1091 } *tempdata; 1092 int error; 1093 prstatus_t *status; 1094 prfpregset_t *fpregset; 1095 prpsinfo_t *psinfo; 1096 int nbytes; 1097 tempdata = malloc(sizeof(*tempdata), M_TEMP, M_ZERO | M_WAITOK); 1098 status = &tempdata->status; 1099 fpregset = &tempdata->fpregset; 1100 psinfo = &tempdata->psinfo; 1101 1102 /* Gather the information for the header. */ 1103 status->pr_version = PRSTATUS_VERSION; 1104 status->pr_statussz = sizeof(prstatus_t); 1105 status->pr_gregsetsz = sizeof(gregset_t); 1106 status->pr_fpregsetsz = sizeof(fpregset_t); 1107 status->pr_osreldate = osreldate; 1108 status->pr_cursig = p->p_sig; 1109 status->pr_pid = p->p_pid; 1110 fill_regs(p, &status->pr_reg); 1111 1112 fill_fpregs(p, fpregset); 1113 1114 psinfo->pr_version = PRPSINFO_VERSION; 1115 psinfo->pr_psinfosz = sizeof(prpsinfo_t); 1116 strncpy(psinfo->pr_fname, p->p_comm, sizeof(psinfo->pr_fname) - 1); 1117 1118 /* XXX - We don't fill in the command line arguments properly yet. */ 1119 strncpy(psinfo->pr_psargs, p->p_comm, PRARGSZ); 1120 1121 /* Fill in the header. */ 1122 error = elf_puthdr(p, target, status, fpregset, psinfo, numsegs); 1123 1124 free(tempdata, M_TEMP); 1125 1126 /* Write it to the core file. */ 1127 if (error == 0) 1128 error = fp_write(fp, target->buf, target->off, &nbytes); 1129 return error; 1130 } 1131 1132 static int 1133 elf_puthdr(struct proc *p, elf_buf_t target, const prstatus_t *status, 1134 const prfpregset_t *fpregset, const prpsinfo_t *psinfo, int numsegs) 1135 { 1136 int error = 0; 1137 size_t phoff; 1138 size_t noteoff; 1139 size_t notesz; 1140 Elf_Ehdr *ehdr; 1141 Elf_Phdr *phdr; 1142 1143 ehdr = target_reserve(target, sizeof(Elf_Ehdr), &error); 1144 1145 phoff = target->off; 1146 phdr = target_reserve(target, (numsegs + 1) * sizeof(Elf_Phdr), &error); 1147 1148 noteoff = target->off; 1149 if (error == 0) { 1150 error = elf_putnote(target, "FreeBSD", NT_PRSTATUS, 1151 status, sizeof *status); 1152 } 1153 if (error == 0) { 1154 error = elf_putnote(target, "FreeBSD", NT_FPREGSET, 1155 fpregset, sizeof *fpregset); 1156 } 1157 if (error == 0) { 1158 error = elf_putnote(target, "FreeBSD", NT_PRPSINFO, 1159 psinfo, sizeof *psinfo); 1160 } 1161 notesz = target->off - noteoff; 1162 1163 /* 1164 * put extra cruft for dumping process state here 1165 * - we really want it be before all the program 1166 * mappings 1167 * - we just need to update the offset accordingly 1168 * and GDB will be none the wiser. 1169 */ 1170 if (error == 0) 1171 error = elf_puttextvp(p, target); 1172 if (error == 0) 1173 error = elf_putsigs(p, target); 1174 if (error == 0) 1175 error = elf_putfiles(p, target); 1176 1177 /* 1178 * Align up to a page boundary for the program segments. The 1179 * actual data will be written to the outptu file, not to elf_buf_t, 1180 * so we do not have to do any further bounds checking. 1181 */ 1182 target->off = round_page(target->off); 1183 if (error == 0 && ehdr != NULL) { 1184 /* 1185 * Fill in the ELF header. 1186 */ 1187 ehdr->e_ident[EI_MAG0] = ELFMAG0; 1188 ehdr->e_ident[EI_MAG1] = ELFMAG1; 1189 ehdr->e_ident[EI_MAG2] = ELFMAG2; 1190 ehdr->e_ident[EI_MAG3] = ELFMAG3; 1191 ehdr->e_ident[EI_CLASS] = ELF_CLASS; 1192 ehdr->e_ident[EI_DATA] = ELF_DATA; 1193 ehdr->e_ident[EI_VERSION] = EV_CURRENT; 1194 ehdr->e_ident[EI_OSABI] = ELFOSABI_FREEBSD; 1195 ehdr->e_ident[EI_ABIVERSION] = 0; 1196 ehdr->e_ident[EI_PAD] = 0; 1197 ehdr->e_type = ET_CORE; 1198 ehdr->e_machine = ELF_ARCH; 1199 ehdr->e_version = EV_CURRENT; 1200 ehdr->e_entry = 0; 1201 ehdr->e_phoff = phoff; 1202 ehdr->e_flags = 0; 1203 ehdr->e_ehsize = sizeof(Elf_Ehdr); 1204 ehdr->e_phentsize = sizeof(Elf_Phdr); 1205 ehdr->e_phnum = numsegs + 1; 1206 ehdr->e_shentsize = sizeof(Elf_Shdr); 1207 ehdr->e_shnum = 0; 1208 ehdr->e_shstrndx = SHN_UNDEF; 1209 } 1210 if (error == 0 && phdr != NULL) { 1211 /* 1212 * Fill in the program header entries. 1213 */ 1214 struct phdr_closure phc; 1215 1216 /* The note segement. */ 1217 phdr->p_type = PT_NOTE; 1218 phdr->p_offset = noteoff; 1219 phdr->p_vaddr = 0; 1220 phdr->p_paddr = 0; 1221 phdr->p_filesz = notesz; 1222 phdr->p_memsz = 0; 1223 phdr->p_flags = 0; 1224 phdr->p_align = 0; 1225 ++phdr; 1226 1227 /* All the writable segments from the program. */ 1228 phc.phdr = phdr; 1229 phc.phdr_max = phdr + numsegs; 1230 phc.offset = target->off; 1231 each_segment(p, cb_put_phdr, &phc, 1); 1232 } 1233 return (error); 1234 } 1235 1236 static int 1237 elf_putnote(elf_buf_t target, const char *name, int type, 1238 const void *desc, size_t descsz) 1239 { 1240 int error = 0; 1241 char *dst; 1242 Elf_Note note; 1243 1244 note.n_namesz = strlen(name) + 1; 1245 note.n_descsz = descsz; 1246 note.n_type = type; 1247 dst = target_reserve(target, sizeof(note), &error); 1248 if (dst != NULL) 1249 bcopy(¬e, dst, sizeof note); 1250 dst = target_reserve(target, note.n_namesz, &error); 1251 if (dst != NULL) 1252 bcopy(name, dst, note.n_namesz); 1253 target->off = roundup2(target->off, sizeof(Elf_Size)); 1254 dst = target_reserve(target, note.n_descsz, &error); 1255 if (dst != NULL) 1256 bcopy(desc, dst, note.n_descsz); 1257 target->off = roundup2(target->off, sizeof(Elf_Size)); 1258 return(error); 1259 } 1260 1261 1262 static int 1263 elf_putsigs(struct proc *p, elf_buf_t target) 1264 { 1265 int error = 0; 1266 struct ckpt_siginfo *csi; 1267 1268 csi = target_reserve(target, sizeof(struct ckpt_siginfo), &error); 1269 if (csi) { 1270 csi->csi_ckptpisz = sizeof(struct ckpt_siginfo); 1271 bcopy(p->p_procsig, &csi->csi_procsig, sizeof(struct procsig)); 1272 bcopy(p->p_procsig->ps_sigacts, &csi->csi_sigacts, sizeof(struct sigacts)); 1273 bcopy(&p->p_realtimer, &csi->csi_itimerval, sizeof(struct itimerval)); 1274 csi->csi_sigparent = p->p_sigparent; 1275 } 1276 return(error); 1277 } 1278 1279 static int 1280 elf_putfiles(struct proc *p, elf_buf_t target) 1281 { 1282 int error = 0; 1283 int i; 1284 struct ckpt_filehdr *cfh = NULL; 1285 struct ckpt_fileinfo *cfi; 1286 struct file *fp; 1287 struct vnode *vp; 1288 /* 1289 * the duplicated loop is gross, but it was the only way 1290 * to eliminate uninitialized variable warnings 1291 */ 1292 cfh = target_reserve(target, sizeof(struct ckpt_filehdr), &error); 1293 if (cfh) { 1294 cfh->cfh_nfiles = 0; 1295 } 1296 1297 /* 1298 * ignore STDIN/STDERR/STDOUT 1299 */ 1300 for (i = 3; error == 0 && i < p->p_fd->fd_nfiles; i++) { 1301 if ((fp = p->p_fd->fd_ofiles[i]) == NULL) 1302 continue; 1303 if (fp->f_type != DTYPE_VNODE) 1304 continue; 1305 cfi = target_reserve(target, sizeof(struct ckpt_fileinfo), &error); 1306 if (cfi) { 1307 cfi->cfi_index = -1; 1308 vp = (struct vnode *)fp->f_data; 1309 /* 1310 * it looks like a bug in ptrace is marking 1311 * a non-vnode as a vnode - until we find the 1312 * root cause this will at least prevent 1313 * further panics from truss 1314 */ 1315 if (vp == NULL || vp->v_mount == NULL) 1316 continue; 1317 cfh->cfh_nfiles++; 1318 cfi->cfi_index = i; 1319 cfi->cfi_flags = fp->f_flag; 1320 cfi->cfi_offset = fp->f_offset; 1321 cfi->cfi_fh.fh_fsid = vp->v_mount->mnt_stat.f_fsid; 1322 error = VFS_VPTOFH(vp, &cfi->cfi_fh.fh_fid); 1323 } 1324 } 1325 return(error); 1326 } 1327 1328 static int 1329 elf_puttextvp(struct proc *p, elf_buf_t target) 1330 { 1331 int error = 0; 1332 int *vn_count; 1333 struct fp_closure fpc; 1334 struct ckpt_vminfo *vminfo; 1335 1336 vminfo = target_reserve(target, sizeof(struct ckpt_vminfo), &error); 1337 if (vminfo != NULL) { 1338 vminfo->cvm_dsize = p->p_vmspace->vm_dsize; 1339 vminfo->cvm_tsize = p->p_vmspace->vm_tsize; 1340 vminfo->cvm_daddr = p->p_vmspace->vm_daddr; 1341 vminfo->cvm_taddr = p->p_vmspace->vm_taddr; 1342 } 1343 1344 fpc.count = 0; 1345 vn_count = target_reserve(target, sizeof(int), &error); 1346 if (target->buf != NULL) { 1347 fpc.vnh = (struct vn_hdr *)(target->buf + target->off); 1348 fpc.vnh_max = fpc.vnh + 1349 (target->off_max - target->off) / sizeof(struct vn_hdr); 1350 error = each_segment(p, cb_put_fp, &fpc, 0); 1351 if (vn_count) 1352 *vn_count = fpc.count; 1353 } else { 1354 error = each_segment(p, cb_fpcount_segment, &fpc.count, 0); 1355 } 1356 target->off += fpc.count * sizeof(struct vn_hdr); 1357 return(error); 1358 } 1359 1360 1361 /* 1362 * Tell kern_execve.c about it, with a little help from the linker. 1363 */ 1364 static struct execsw elf_execsw = {exec_elf_imgact, "ELF"}; 1365 EXEC_SET_ORDERED(elf, elf_execsw, SI_ORDER_FIRST); 1366