sys/kern/imgact_elf.c

   1 /*-
   2  * Copyright (c) 1995-1996 Søren 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 1.10 2003/10/19 19:24:18 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->uap = NULL;
 366         imgp->attr = attr;
 367         imgp->firstpage = NULL;
 368         imgp->image_header = (char *)kmem_alloc_wait(exec_map, PAGE_SIZE);
 369
 370         if (imgp->image_header == NULL) {
 371                 nd->ni_vp = NULL;
 372                 error = ENOMEM;
 373                 goto fail;
 374         }
 375
 376         NDINIT(nd, NAMEI_LOOKUP, CNP_LOCKLEAF | CNP_FOLLOW,
 377             UIO_SYSSPACE, file, td);
 378
 379         if ((error = namei(nd)) != 0) {
 380                 nd->ni_vp = NULL;
 381                 goto fail;
 382         }
 383         NDFREE(nd, NDF_ONLY_PNBUF);
 384         imgp->vp = nd->ni_vp;
 385
 386         /*
 387          * Check permissions, modes, uid, etc on the file, and "open" it.
 388          */
 389         error = exec_check_permissions(imgp);
 390         if (error) {
 391                 VOP_UNLOCK(nd->ni_vp, 0, td);
 392                 goto fail;
 393         }
 394
 395         error = exec_map_first_page(imgp);
 396         /*
 397          * Also make certain that the interpreter stays the same, so set
 398          * its VTEXT flag, too.
 399          */
 400         if (error == 0)
 401                 nd->ni_vp->v_flag |= VTEXT;
 402         VOP_UNLOCK(nd->ni_vp, 0, td);
 403         if (error)
 404                 goto fail;
 405
 406         hdr = (const Elf_Ehdr *)imgp->image_header;
 407         if ((error = elf_check_header(hdr)) != 0)
 408                 goto fail;
 409         if (hdr->e_type == ET_DYN)
 410                 rbase = *addr;
 411         else if (hdr->e_type == ET_EXEC)
 412                 rbase = 0;
 413         else {
 414                 error = ENOEXEC;
 415                 goto fail;
 416         }
 417
 418         /* Only support headers that fit within first page for now */
 419         if ((hdr->e_phoff > PAGE_SIZE) ||
 420             (hdr->e_phoff + hdr->e_phentsize * hdr->e_phnum) > PAGE_SIZE) {
 421                 error = ENOEXEC;
 422                 goto fail;
 423         }
 424
 425         phdr = (const Elf_Phdr *)(imgp->image_header + hdr->e_phoff);
 426
 427         for (i = 0, numsegs = 0; i < hdr->e_phnum; i++) {
 428                 if (phdr[i].p_type == PT_LOAD) {        /* Loadable segment */
 429                         prot = 0;
 430                         if (phdr[i].p_flags & PF_X)
 431                                 prot |= VM_PROT_EXECUTE;
 432                         if (phdr[i].p_flags & PF_W)
 433                                 prot |= VM_PROT_WRITE;
 434                         if (phdr[i].p_flags & PF_R)
 435                                 prot |= VM_PROT_READ;
 436
 437                         error = elf_load_section(
 438                                     p, vmspace, nd->ni_vp,
 439                                     phdr[i].p_offset,
 440                                     (caddr_t)phdr[i].p_vaddr +
 441                                     rbase,
 442                                     phdr[i].p_memsz,
 443                                     phdr[i].p_filesz, prot);
 444                         if (error != 0)
 445                                 goto fail;
 446                         /*
 447                          * Establish the base address if this is the
 448                          * first segment.
 449                          */
 450                         if (numsegs == 0)
 451                                 base_addr = trunc_page(phdr[i].p_vaddr + rbase);
 452                         numsegs++;
 453                 }
 454         }
 455         *addr = base_addr;
 456         *entry=(unsigned long)hdr->e_entry + rbase;
 457
 458 fail:
 459         if (imgp->firstpage)
 460                 exec_unmap_first_page(imgp);
 461         if (imgp->image_header)
 462                 kmem_free_wakeup(exec_map, (vm_offset_t)imgp->image_header,
 463                         PAGE_SIZE);
 464         if (nd->ni_vp)
 465                 vrele(nd->ni_vp);
 466
 467         free(tempdata, M_TEMP);
 468
 469         return error;
 470 }
 471
 472 /*
 473  * non static, as it can be overridden by start_init()
 474  */
 475 int fallback_elf_brand = -1;
 476 SYSCTL_INT(_kern, OID_AUTO, fallback_elf_brand, CTLFLAG_RW,
 477                 &fallback_elf_brand, -1,
 478                 "ELF brand of last resort");
 479
 480 static int
 481 exec_elf_imgact(struct image_params *imgp)
 482 {
 483         const Elf_Ehdr *hdr = (const Elf_Ehdr *) imgp->image_header;
 484         const Elf_Phdr *phdr;
 485         Elf_Auxargs *elf_auxargs = NULL;
 486         struct vmspace *vmspace;
 487         vm_prot_t prot;
 488         u_long text_size = 0, data_size = 0, total_size = 0;
 489         u_long text_addr = 0, data_addr = 0;
 490         u_long seg_size, seg_addr;
 491         u_long addr, entry = 0, proghdr = 0;
 492         int error, i;
 493         const char *interp = NULL;
 494         Elf_Brandinfo *brand_info;
 495         char *path;
 496
 497         /*
 498          * Do we have a valid ELF header ?
 499          */
 500         if (elf_check_header(hdr) != 0 || hdr->e_type != ET_EXEC)
 501                 return -1;
 502
 503         /*
 504          * From here on down, we return an errno, not -1, as we've
 505          * detected an ELF file.
 506          */
 507
 508         if ((hdr->e_phoff > PAGE_SIZE) ||
 509             (hdr->e_phoff + hdr->e_phentsize * hdr->e_phnum) > PAGE_SIZE) {
 510                 /* Only support headers in first page for now */
 511                 return ENOEXEC;
 512         }
 513         phdr = (const Elf_Phdr*)(imgp->image_header + hdr->e_phoff);
 514
 515         /*
 516          * From this point on, we may have resources that need to be freed.
 517          */
 518
 519         if ((error = exec_extract_strings(imgp)) != 0)
 520                 goto fail;
 521
 522         exec_new_vmspace(imgp);
 523
 524         /*
 525          * Yeah, I'm paranoid.  There is every reason in the world to get
 526          * VTEXT now since from here on out, there are places we can have
 527          * a context switch.  Better safe than sorry; I really don't want
 528          * the file to change while it's being loaded.
 529          */
 530         lwkt_gettoken(&imgp->vp->v_interlock);
 531         imgp->vp->v_flag |= VTEXT;
 532         lwkt_reltoken(&imgp->vp->v_interlock);
 533
 534         vmspace = imgp->proc->p_vmspace;
 535
 536         for (i = 0; i < hdr->e_phnum; i++) {
 537                 switch(phdr[i].p_type) {
 538
 539                 case PT_LOAD:   /* Loadable segment */
 540                         prot = 0;
 541                         if (phdr[i].p_flags & PF_X)
 542                                 prot |= VM_PROT_EXECUTE;
 543                         if (phdr[i].p_flags & PF_W)
 544                                 prot |= VM_PROT_WRITE;
 545                         if (phdr[i].p_flags & PF_R)
 546                                 prot |= VM_PROT_READ;
 547
 548                         if ((error = elf_load_section(imgp->proc,
 549                                                      vmspace, imgp->vp,
 550                                                      phdr[i].p_offset,
 551                                                      (caddr_t)phdr[i].p_vaddr,
 552                                                      phdr[i].p_memsz,
 553                                                      phdr[i].p_filesz, prot)) != 0)
 554                                 goto fail;
 555
 556                         seg_addr = trunc_page(phdr[i].p_vaddr);
 557                         seg_size = round_page(phdr[i].p_memsz +
 558                                 phdr[i].p_vaddr - seg_addr);
 559
 560                         /*
 561                          * Is this .text or .data?  We can't use
 562                          * VM_PROT_WRITE or VM_PROT_EXEC, it breaks the
 563                          * alpha terribly and possibly does other bad
 564                          * things so we stick to the old way of figuring
 565                          * it out:  If the segment contains the program
 566                          * entry point, it's a text segment, otherwise it
 567                          * is a data segment.
 568                          *
 569                          * Note that obreak() assumes that data_addr +
 570                          * data_size == end of data load area, and the ELF
 571                          * file format expects segments to be sorted by
 572                          * address.  If multiple data segments exist, the
 573                          * last one will be used.
 574                          */
 575                         if (hdr->e_entry >= phdr[i].p_vaddr &&
 576                             hdr->e_entry < (phdr[i].p_vaddr +
 577                             phdr[i].p_memsz)) {
 578                                 text_size = seg_size;
 579                                 text_addr = seg_addr;
 580                                 entry = (u_long)hdr->e_entry;
 581                         } else {
 582                                 data_size = seg_size;
 583                                 data_addr = seg_addr;
 584                         }
 585                         total_size += seg_size;
 586
 587                         /*
 588                          * Check limits.  It should be safe to check the
 589                          * limits after loading the segment since we do
 590                          * not actually fault in all the segment's pages.
 591                          */
 592                         if (data_size >
 593                             imgp->proc->p_rlimit[RLIMIT_DATA].rlim_cur ||
 594                             text_size > maxtsiz ||
 595                             total_size >
 596                             imgp->proc->p_rlimit[RLIMIT_VMEM].rlim_cur) {
 597                                 error = ENOMEM;
 598                                 goto fail;
 599                         }
 600                         break;
 601                 case PT_INTERP: /* Path to interpreter */
 602                         if (phdr[i].p_filesz > MAXPATHLEN ||
 603                             phdr[i].p_offset + phdr[i].p_filesz > PAGE_SIZE) {
 604                                 error = ENOEXEC;
 605                                 goto fail;
 606                         }
 607                         interp = imgp->image_header + phdr[i].p_offset;
 608                         break;
 609                 case PT_PHDR:   /* Program header table info */
 610                         proghdr = phdr[i].p_vaddr;
 611                         break;
 612                 default:
 613                         break;
 614                 }
 615         }
 616
 617         vmspace->vm_tsize = text_size >> PAGE_SHIFT;
 618         vmspace->vm_taddr = (caddr_t)(uintptr_t)text_addr;
 619         vmspace->vm_dsize = data_size >> PAGE_SHIFT;
 620         vmspace->vm_daddr = (caddr_t)(uintptr_t)data_addr;
 621
 622         addr = ELF_RTLD_ADDR(vmspace);
 623
 624         imgp->entry_addr = entry;
 625
 626         brand_info = NULL;
 627
 628         /* We support three types of branding -- (1) the ELF EI_OSABI field
 629          * that SCO added to the ELF spec, (2) FreeBSD 3.x's traditional string
 630          * branding w/in the ELF header, and (3) path of the `interp_path'
 631          * field.  We should also look for an ".note.ABI-tag" ELF section now
 632          * in all Linux ELF binaries, FreeBSD 4.1+, and some NetBSD ones.
 633          */
 634
 635         /* If the executable has a brand, search for it in the brand list. */
 636         if (brand_info == NULL) {
 637                 for (i = 0;  i < MAX_BRANDS;  i++) {
 638                         Elf_Brandinfo *bi = elf_brand_list[i];
 639
 640                         if (bi != NULL &&
 641                             (hdr->e_ident[EI_OSABI] == bi->brand
 642                             || 0 ==
 643                             strncmp((const char *)&hdr->e_ident[OLD_EI_BRAND],
 644                             bi->compat_3_brand, strlen(bi->compat_3_brand)))) {
 645                                 brand_info = bi;
 646                                 break;
 647                         }
 648                 }
 649         }
 650
 651         /* Lacking a known brand, search for a recognized interpreter. */
 652         if (brand_info == NULL && interp != NULL) {
 653                 for (i = 0;  i < MAX_BRANDS;  i++) {
 654                         Elf_Brandinfo *bi = elf_brand_list[i];
 655
 656                         if (bi != NULL &&
 657                             strcmp(interp, bi->interp_path) == 0) {
 658                                 brand_info = bi;
 659                                 break;
 660                         }
 661                 }
 662         }
 663
 664         /* Lacking a recognized interpreter, try the default brand */
 665         if (brand_info == NULL) {
 666                 for (i = 0; i < MAX_BRANDS; i++) {
 667                         Elf_Brandinfo *bi = elf_brand_list[i];
 668
 669                         if (bi != NULL && fallback_elf_brand == bi->brand) {
 670                                 brand_info = bi;
 671                                 break;
 672                         }
 673                 }
 674         }
 675
 676         if (brand_info == NULL) {
 677                 uprintf("ELF binary type \"%u\" not known.\n",
 678                     hdr->e_ident[EI_OSABI]);
 679                 error = ENOEXEC;
 680                 goto fail;
 681         }
 682
 683         imgp->proc->p_sysent = brand_info->sysvec;
 684         if (interp != NULL) {
 685                 path = malloc(MAXPATHLEN, M_TEMP, M_WAITOK);
 686                 snprintf(path, MAXPATHLEN, "%s%s",
 687                          brand_info->emul_path, interp);
 688                 if ((error = elf_load_file(imgp->proc, path, &addr,
 689                                            &imgp->entry_addr)) != 0) {
 690                         if ((error = elf_load_file(imgp->proc, interp, &addr,
 691                                                    &imgp->entry_addr)) != 0) {
 692                                 uprintf("ELF interpreter %s not found\n", path);
 693                                 free(path, M_TEMP);
 694                                 goto fail;
 695                         }
 696                 }
 697                 free(path, M_TEMP);
 698         }
 699
 700         /*
 701          * Construct auxargs table (used by the fixup routine)
 702          */
 703         elf_auxargs = malloc(sizeof(Elf_Auxargs), M_TEMP, M_WAITOK);
 704         elf_auxargs->execfd = -1;
 705         elf_auxargs->phdr = proghdr;
 706         elf_auxargs->phent = hdr->e_phentsize;
 707         elf_auxargs->phnum = hdr->e_phnum;
 708         elf_auxargs->pagesz = PAGE_SIZE;
 709         elf_auxargs->base = addr;
 710         elf_auxargs->flags = 0;
 711         elf_auxargs->entry = entry;
 712         elf_auxargs->trace = elf_trace;
 713
 714         imgp->auxargs = elf_auxargs;
 715         imgp->interpreted = 0;
 716
 717 fail:
 718         return error;
 719 }
 720
 721 static int
 722 elf_freebsd_fixup(register_t **stack_base, struct image_params *imgp)
 723 {
 724         Elf_Auxargs *args = (Elf_Auxargs *)imgp->auxargs;
 725         register_t *pos;
 726
 727         pos = *stack_base + (imgp->argc + imgp->envc + 2);
 728
 729         if (args->trace) {
 730                 AUXARGS_ENTRY(pos, AT_DEBUG, 1);
 731         }
 732         if (args->execfd != -1) {
 733                 AUXARGS_ENTRY(pos, AT_EXECFD, args->execfd);
 734         }
 735         AUXARGS_ENTRY(pos, AT_PHDR, args->phdr);
 736         AUXARGS_ENTRY(pos, AT_PHENT, args->phent);
 737         AUXARGS_ENTRY(pos, AT_PHNUM, args->phnum);
 738         AUXARGS_ENTRY(pos, AT_PAGESZ, args->pagesz);
 739         AUXARGS_ENTRY(pos, AT_FLAGS, args->flags);
 740         AUXARGS_ENTRY(pos, AT_ENTRY, args->entry);
 741         AUXARGS_ENTRY(pos, AT_BASE, args->base);
 742         AUXARGS_ENTRY(pos, AT_NULL, 0);
 743
 744         free(imgp->auxargs, M_TEMP);
 745         imgp->auxargs = NULL;
 746
 747         (*stack_base)--;
 748         suword(*stack_base, (long) imgp->argc);
 749         return 0;
 750 }
 751
 752 /*
 753  * Code for generating ELF core dumps.
 754  */
 755
 756 typedef void (*segment_callback) (vm_map_entry_t, void *);
 757
 758 /* Closure for cb_put_phdr(). */
 759 struct phdr_closure {
 760         Elf_Phdr *phdr;         /* Program header to fill in */
 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 size;            /* Total size of all writable segments. */
 768 };
 769
 770 struct fp_closure {
 771         struct vn_hdr *vnh;
 772         int count;
 773         struct stat *sb;
 774 };
 775
 776
 777
 778 static void cb_put_phdr (vm_map_entry_t, void *);
 779 static void cb_size_segment (vm_map_entry_t, void *);
 780 static void cb_fpcount_segment(vm_map_entry_t, void *);
 781 static void cb_put_fp(vm_map_entry_t, void *);
 782
 783
 784 static void each_segment (struct proc *, segment_callback,
 785     void *, int);
 786 static int elf_corehdr (struct proc *, struct file *, struct ucred *,
 787     int, void *, size_t);
 788 static void elf_puthdr (struct proc *, void *, size_t *,
 789     const prstatus_t *, const prfpregset_t *, const prpsinfo_t *, int);
 790 static void elf_putnote (void *, size_t *, const char *, int,
 791     const void *, size_t);
 792
 793 static void elf_putsigs(struct proc *, void *, int *);
 794
 795 static void elf_puttextvp(struct proc *, void *, int *);
 796 static void elf_putfiles(struct proc *, void *, int *);
 797
 798
 799 extern int osreldate;
 800
 801 int
 802 elf_coredump(struct proc *p, struct vnode *vp, off_t limit)
 803 {
 804         struct file *fp;
 805         int error;
 806
 807         if ((error = falloc(NULL, &fp, NULL)) != 0)
 808                 return (error);
 809         fsetcred(fp, p->p_ucred);
 810
 811         fp->f_data = (caddr_t)vp;
 812         fp->f_flag = O_CREAT|O_WRONLY|O_NOFOLLOW;
 813         fp->f_ops = &vnops;
 814         fp->f_type = DTYPE_VNODE;
 815         VOP_UNLOCK(vp, 0, p->p_thread);
 816
 817         error = generic_elf_coredump(p, fp, limit);
 818
 819         fp->f_data = NULL;
 820         fp->f_flag = 0;
 821         fp->f_ops = &badfileops;
 822         fp->f_type = 0;
 823         fdrop(fp, p->p_thread);
 824         return (error);
 825 }
 826
 827 int
 828 generic_elf_coredump(struct proc *p, struct file *fp, off_t limit)
 829 {
 830
 831         struct ucred *cred = p->p_ucred;
 832         int error = 0;
 833         struct sseg_closure seginfo;
 834         void *hdr;
 835         size_t hdrsize;
 836
 837         if (!fp)
 838                 printf("can't dump core - null fp\n");
 839         /* Size the program segments. */
 840         seginfo.count = 0;
 841         seginfo.size = 0;
 842         each_segment(p, cb_size_segment, &seginfo, 1);
 843
 844         /*
 845          * Calculate the size of the core file header area by making
 846          * a dry run of generating it.  Nothing is written, but the
 847          * size is calculated.
 848          */
 849
 850         hdrsize = 0;
 851         elf_puthdr(p, (void *)NULL, &hdrsize,
 852             (const prstatus_t *)NULL, (const prfpregset_t *)NULL,
 853             (const prpsinfo_t *)NULL, seginfo.count);
 854
 855         if (hdrsize + seginfo.size >= limit)
 856                 return (EFAULT);
 857
 858         /*
 859          * Allocate memory for building the header, fill it up,
 860          * and write it out.
 861          */
 862         hdr = malloc(hdrsize, M_TEMP, M_WAITOK);
 863         if (hdr == NULL) {
 864                 return EINVAL;
 865         }
 866         error = elf_corehdr(p, fp, cred, seginfo.count, hdr, hdrsize);
 867
 868         /* Write the contents of all of the writable segments. */
 869         if (error == 0) {
 870                 Elf_Phdr *php;
 871                 off_t offset;
 872                 int i;
 873
 874                 php = (Elf_Phdr *)((char *)hdr + sizeof(Elf_Ehdr)) + 1;
 875                 offset = hdrsize;
 876                 for (i = 0;  i < seginfo.count;  i++) {
 877                         int nbytes;
 878                         error = fp_pwrite(fp, (caddr_t)php->p_vaddr, php->p_filesz,
 879                                          offset, &nbytes);
 880                         if (error != 0)
 881                                 break;
 882                         offset += php->p_filesz;
 883                         php++;
 884                 }
 885         }
 886         free(hdr, M_TEMP);
 887
 888         return error;
 889 }
 890
 891 /*
 892  * A callback for each_segment() to write out the segment's
 893  * program header entry.
 894  */
 895 static void
 896 cb_put_phdr(vm_map_entry_t entry, void *closure)
 897 {
 898         struct phdr_closure *phc = (struct phdr_closure *)closure;
 899         Elf_Phdr *phdr = phc->phdr;
 900
 901         phc->offset = round_page(phc->offset);
 902
 903         phdr->p_type = PT_LOAD;
 904         phdr->p_offset = phc->offset;
 905         phdr->p_vaddr = entry->start;
 906         phdr->p_paddr = 0;
 907         phdr->p_filesz = phdr->p_memsz = entry->end - entry->start;
 908         phdr->p_align = PAGE_SIZE;
 909         phdr->p_flags = 0;
 910         if (entry->protection & VM_PROT_READ)
 911                 phdr->p_flags |= PF_R;
 912         if (entry->protection & VM_PROT_WRITE)
 913                 phdr->p_flags |= PF_W;
 914         if (entry->protection & VM_PROT_EXECUTE)
 915                 phdr->p_flags |= PF_X;
 916
 917         phc->offset += phdr->p_filesz;
 918         phc->phdr++;
 919 }
 920
 921 /*
 922  * A callback for each_writable_segment() to gather information about
 923  * the number of segments and their total size.
 924  */
 925 static void
 926 cb_size_segment(vm_map_entry_t entry, void *closure)
 927 {
 928         struct sseg_closure *ssc = (struct sseg_closure *)closure;
 929
 930         ssc->count++;
 931         ssc->size += entry->end - entry->start;
 932 }
 933
 934 /*
 935  * A callback for each_segment() to gather information about
 936  * the number of text segments.
 937  */
 938 static void
 939 cb_fpcount_segment(vm_map_entry_t entry, void *closure)
 940 {
 941         int *count = (int *)closure;
 942         if (entry->object.vm_object->type == OBJT_VNODE)
 943                 ++*count;
 944 }
 945
 946 static void
 947 cb_put_fp(vm_map_entry_t entry, void *closure)
 948 {
 949         struct fp_closure *fpc = (struct fp_closure *)closure;
 950         struct vn_hdr *vnh = fpc->vnh;
 951         Elf_Phdr *phdr = &vnh->vnh_phdr;
 952         struct vnode *vp;
 953         int error;
 954
 955         if (entry->object.vm_object->type == OBJT_VNODE) {
 956                 vp = (struct vnode *)entry->object.vm_object->handle;
 957
 958                 vnh->vnh_fh.fh_fsid = vp->v_mount->mnt_stat.f_fsid;
 959                 error = VFS_VPTOFH(vp, &vnh->vnh_fh.fh_fid);
 960                 if (error)
 961                         return;
 962
 963
 964                 phdr->p_type = PT_LOAD;
 965                 phdr->p_offset = 0;        /* not written to core */
 966                 phdr->p_vaddr = entry->start;
 967                 phdr->p_paddr = 0;
 968                 phdr->p_filesz = phdr->p_memsz = entry->end - entry->start;
 969                 phdr->p_align = PAGE_SIZE;
 970                 phdr->p_flags = 0;
 971                 if (entry->protection & VM_PROT_READ)
 972                         phdr->p_flags |= PF_R;
 973                 if (entry->protection & VM_PROT_WRITE)
 974                         phdr->p_flags |= PF_W;
 975                 if (entry->protection & VM_PROT_EXECUTE)
 976                         phdr->p_flags |= PF_X;
 977                 ++fpc->vnh;
 978                 ++fpc->count;
 979         }
 980 }
 981
 982
 983
 984
 985 /*
 986  * For each writable segment in the process's memory map, call the given
 987  * function with a pointer to the map entry and some arbitrary
 988  * caller-supplied data.
 989  */
 990 static void
 991 each_segment(struct proc *p, segment_callback func, void *closure, int writable)
 992 {
 993         vm_map_t map = &p->p_vmspace->vm_map;
 994         vm_map_entry_t entry;
 995
 996         for (entry = map->header.next;  entry != &map->header;
 997             entry = entry->next) {
 998                 vm_object_t obj;
 999
1000                 /*
1001                  * Don't dump inaccessible mappings, deal with legacy
1002                  * coredump mode.
1003                  *
1004                  * Note that read-only segments related to the elf binary
1005                  * are marked MAP_ENTRY_NOCOREDUMP now so we no longer
1006                  * need to arbitrarily ignore such segments.
1007                  */
1008                 if (elf_legacy_coredump) {
1009                         if (writable && (entry->protection & VM_PROT_RW) != VM_PROT_RW)
1010                                 continue;
1011                 } else {
1012                         if (writable && (entry->protection & VM_PROT_ALL) == 0)
1013                                 continue;
1014                 }
1015
1016                 /*
1017                  * Dont include memory segment in the coredump if
1018                  * MAP_NOCORE is set in mmap(2) or MADV_NOCORE in
1019                  * madvise(2).  Do not dump submaps (i.e. parts of the
1020                  * kernel map).
1021                  */
1022                 if (writable && entry->eflags & (MAP_ENTRY_NOCOREDUMP|MAP_ENTRY_IS_SUB_MAP))
1023                         continue;
1024
1025                 if ((obj = entry->object.vm_object) == NULL)
1026                         continue;
1027
1028                 /* Find the deepest backing object. */
1029                 while (obj->backing_object != NULL)
1030                         obj = obj->backing_object;
1031
1032                 /* Ignore memory-mapped devices and such things. */
1033                 if (obj->type != OBJT_DEFAULT &&
1034                     obj->type != OBJT_SWAP &&
1035                     obj->type != OBJT_VNODE)
1036                         continue;
1037
1038                 (*func)(entry, closure);
1039         }
1040 }
1041
1042 /*
1043  * Write the core file header to the file, including padding up to
1044  * the page boundary.
1045  */
1046 static int
1047 elf_corehdr(struct proc *p, struct file *fp, struct ucred *cred, int numsegs,
1048             void *hdr, size_t hdrsize)
1049 {
1050         struct {
1051                 prstatus_t status;
1052                 prfpregset_t fpregset;
1053                 prpsinfo_t psinfo;
1054         } *tempdata;
1055         size_t off;
1056         prstatus_t *status;
1057         prfpregset_t *fpregset;
1058         prpsinfo_t *psinfo;
1059         int nbytes;
1060         tempdata = malloc(sizeof(*tempdata), M_TEMP, M_ZERO | M_WAITOK);
1061         status = &tempdata->status;
1062         fpregset = &tempdata->fpregset;
1063         psinfo = &tempdata->psinfo;
1064
1065         /* Gather the information for the header. */
1066         status->pr_version = PRSTATUS_VERSION;
1067         status->pr_statussz = sizeof(prstatus_t);
1068         status->pr_gregsetsz = sizeof(gregset_t);
1069         status->pr_fpregsetsz = sizeof(fpregset_t);
1070         status->pr_osreldate = osreldate;
1071         status->pr_cursig = p->p_sig;
1072         status->pr_pid = p->p_pid;
1073         fill_regs(p, &status->pr_reg);
1074
1075         fill_fpregs(p, fpregset);
1076
1077         psinfo->pr_version = PRPSINFO_VERSION;
1078         psinfo->pr_psinfosz = sizeof(prpsinfo_t);
1079         strncpy(psinfo->pr_fname, p->p_comm, sizeof(psinfo->pr_fname) - 1);
1080
1081         /* XXX - We don't fill in the command line arguments properly yet. */
1082         strncpy(psinfo->pr_psargs, p->p_comm, PRARGSZ);
1083
1084         /* Fill in the header. */
1085         bzero(hdr, hdrsize);
1086         off = 0;
1087         elf_puthdr(p, hdr, &off, status, fpregset, psinfo, numsegs);
1088
1089         free(tempdata, M_TEMP);
1090
1091         /* Write it to the core file. */
1092         return fp_pwrite(fp, hdr, hdrsize, (off_t)0, &nbytes);
1093 }
1094
1095 static void
1096 elf_puthdr(struct proc *p, void *dst, size_t *off, const prstatus_t *status,
1097     const prfpregset_t *fpregset, const prpsinfo_t *psinfo, int numsegs)
1098 {
1099         size_t ehoff;
1100         size_t phoff;
1101         size_t noteoff;
1102         size_t notesz;
1103
1104         ehoff = *off;
1105         *off += sizeof(Elf_Ehdr);
1106
1107         phoff = *off;
1108         *off += (numsegs + 1) * sizeof(Elf_Phdr);
1109
1110         noteoff = *off;
1111         elf_putnote(dst, off, "FreeBSD", NT_PRSTATUS, status,
1112             sizeof *status);
1113         elf_putnote(dst, off, "FreeBSD", NT_FPREGSET, fpregset,
1114             sizeof *fpregset);
1115         elf_putnote(dst, off, "FreeBSD", NT_PRPSINFO, psinfo,
1116             sizeof *psinfo);
1117         notesz = *off - noteoff;
1118
1119         /* put extra cruft for dumping process state here
1120         *  - we really want it be before all the program
1121         *    mappings
1122         *  - we just need to update the offset accordingly
1123         *    and GDB will be none the wiser.
1124         */
1125         elf_puttextvp(p, dst, off);
1126         elf_putsigs(p, dst, off);
1127         elf_putfiles(p, dst, off);
1128
1129         /* Align up to a page boundary for the program segments. */
1130         *off = round_page(*off);
1131
1132         if (dst != NULL) {
1133                 Elf_Ehdr *ehdr;
1134                 Elf_Phdr *phdr;
1135                 struct phdr_closure phc;
1136
1137                 /*
1138                  * Fill in the ELF header.
1139                  */
1140                 ehdr = (Elf_Ehdr *)((char *)dst + ehoff);
1141                 ehdr->e_ident[EI_MAG0] = ELFMAG0;
1142                 ehdr->e_ident[EI_MAG1] = ELFMAG1;
1143                 ehdr->e_ident[EI_MAG2] = ELFMAG2;
1144                 ehdr->e_ident[EI_MAG3] = ELFMAG3;
1145                 ehdr->e_ident[EI_CLASS] = ELF_CLASS;
1146                 ehdr->e_ident[EI_DATA] = ELF_DATA;
1147                 ehdr->e_ident[EI_VERSION] = EV_CURRENT;
1148                 ehdr->e_ident[EI_OSABI] = ELFOSABI_FREEBSD;
1149                 ehdr->e_ident[EI_ABIVERSION] = 0;
1150                 ehdr->e_ident[EI_PAD] = 0;
1151                 ehdr->e_type = ET_CORE;
1152                 ehdr->e_machine = ELF_ARCH;
1153                 ehdr->e_version = EV_CURRENT;
1154                 ehdr->e_entry = 0;
1155                 ehdr->e_phoff = phoff;
1156                 ehdr->e_flags = 0;
1157                 ehdr->e_ehsize = sizeof(Elf_Ehdr);
1158                 ehdr->e_phentsize = sizeof(Elf_Phdr);
1159                 ehdr->e_phnum = numsegs + 1;
1160                 ehdr->e_shentsize = sizeof(Elf_Shdr);
1161                 ehdr->e_shnum = 0;
1162                 ehdr->e_shstrndx = SHN_UNDEF;
1163
1164                 /*
1165                  * Fill in the program header entries.
1166                  */
1167                 phdr = (Elf_Phdr *)((char *)dst + phoff);
1168
1169                 /* The note segement. */
1170                 phdr->p_type = PT_NOTE;
1171                 phdr->p_offset = noteoff;
1172                 phdr->p_vaddr = 0;
1173                 phdr->p_paddr = 0;
1174                 phdr->p_filesz = notesz;
1175                 phdr->p_memsz = 0;
1176                 phdr->p_flags = 0;
1177                 phdr->p_align = 0;
1178                 phdr++;
1179
1180                 /* All the writable segments from the program. */
1181                 phc.phdr = phdr;
1182                 phc.offset = *off;
1183                 each_segment(p, cb_put_phdr, &phc, 1);
1184         }
1185 }
1186
1187 static void
1188 elf_putnote(void *dst, size_t *off, const char *name, int type,
1189     const void *desc, size_t descsz)
1190 {
1191         Elf_Note note;
1192
1193         note.n_namesz = strlen(name) + 1;
1194         note.n_descsz = descsz;
1195         note.n_type = type;
1196         if (dst != NULL)
1197                 bcopy(&note, (char *)dst + *off, sizeof note);
1198         *off += sizeof note;
1199         if (dst != NULL)
1200                 bcopy(name, (char *)dst + *off, note.n_namesz);
1201         *off += roundup2(note.n_namesz, sizeof(Elf_Size));
1202         if (dst != NULL)
1203                 bcopy(desc, (char *)dst + *off, note.n_descsz);
1204         *off += roundup2(note.n_descsz, sizeof(Elf_Size));
1205 }
1206
1207
1208 static void
1209 elf_putsigs(struct proc *p, void *dst, int *off)
1210 {
1211         struct ckpt_siginfo *csi;
1212         if (dst == NULL) {
1213                 *off += sizeof(struct ckpt_siginfo);
1214                 return;
1215         }
1216         csi = (struct ckpt_siginfo *)((char *)dst + *off);
1217
1218         csi->csi_ckptpisz = sizeof(struct ckpt_siginfo);
1219         bcopy(p->p_procsig, &csi->csi_procsig, sizeof(struct procsig));
1220         bcopy(p->p_procsig->ps_sigacts, &csi->csi_sigacts, sizeof(struct sigacts));
1221         bcopy(&p->p_realtimer, &csi->csi_itimerval, sizeof(struct itimerval));
1222         csi->csi_sigparent = p->p_sigparent;
1223         *off += sizeof(struct ckpt_siginfo);
1224 }
1225
1226 static void
1227 elf_putfiles(struct proc *p, void *dst, int *off)
1228 {
1229         int i, error;
1230         struct ckpt_filehdr *cfh;
1231         struct ckpt_fileinfo *cfi;
1232         struct file *fp;
1233         struct vnode *vp;
1234         /*
1235          * the duplicated loop is gross, but it was the only way
1236          * to eliminate uninitialized variable warnings
1237          */
1238         if (dst) {
1239                 cfh = (struct ckpt_filehdr *)((char *)dst + *off);
1240                 *off += sizeof(struct ckpt_filehdr);
1241                 cfh->cfh_nfiles = 0;
1242                 /*
1243                  * ignore STDIN/STDERR/STDOUT
1244                  */
1245                 for (i = 3; i < p->p_fd->fd_nfiles; i++) {
1246                         if ((fp = p->p_fd->fd_ofiles[i]) != NULL && fp->f_type == DTYPE_VNODE) {
1247                                 cfh->cfh_nfiles++;
1248                                 printf("saving fd: %d\n", i);
1249                                 cfi = (struct ckpt_fileinfo *)((char *)dst + *off);
1250                                 cfi->cfi_index = i;
1251                                 cfi->cfi_flags = fp->f_flag;
1252                                 cfi->cfi_offset = fp->f_offset;
1253                                 vp = (struct vnode *)fp->f_data;
1254                                 cfi->cfi_fh.fh_fsid = vp->v_mount->mnt_stat.f_fsid;
1255                                 error = VFS_VPTOFH(vp, &cfi->cfi_fh.fh_fid);
1256
1257                                 *off += sizeof(struct ckpt_fileinfo);
1258                         }
1259                 }
1260         } else {
1261                 *off += sizeof(struct ckpt_filehdr);
1262                 for (i = 0; i < p->p_fd->fd_nfiles; i++)
1263                         if ((fp = p->p_fd->fd_ofiles[i]) != NULL  && fp->f_type == DTYPE_VNODE)
1264                                 *off += sizeof(struct ckpt_fileinfo);
1265         }
1266
1267 }
1268
1269 static void
1270 elf_puttextvp(struct proc *p, void *dst, int *off)
1271 {
1272         int count = 0;
1273         struct fp_closure fpc;
1274         int *vn_count;
1275         if (!dst) {
1276                 each_segment(p, cb_fpcount_segment, &count, 0);
1277                 *off += sizeof(struct vn_hdr)*count + sizeof(int);
1278                 return;
1279         }
1280         vn_count = (int *)((char *)dst + *off);
1281         *off += sizeof(int);
1282         fpc.vnh = (struct vn_hdr *)((char *)dst + *off);
1283         fpc.count = 0;
1284         each_segment(p, cb_put_fp, &fpc, 0);
1285         *vn_count = fpc.count;
1286         *off += fpc.count*sizeof(struct vn_hdr);
1287 }
1288
1289
1290 /*
1291  * Tell kern_execve.c about it, with a little help from the linker.
1292  */
1293 static struct execsw elf_execsw = {exec_elf_imgact, "ELF"};
1294 EXEC_SET(elf, elf_execsw);