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 1.20 2004/06/08 10:14:45 hsu 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             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 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 = NULL;
 368
 369         NDINIT(nd, NAMEI_LOOKUP, CNP_LOCKLEAF | CNP_FOLLOW,
 370             UIO_SYSSPACE, file, td);
 371
 372         if ((error = namei(nd)) != 0) {
 373                 nd->ni_vp = NULL;
 374                 goto fail;
 375         }
 376         NDFREE(nd, NDF_ONLY_PNBUF);
 377         imgp->vp = nd->ni_vp;
 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(nd->ni_vp, NULL, 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                 nd->ni_vp->v_flag |= VTEXT;
 395         VOP_UNLOCK(nd->ni_vp, NULL, 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, nd->ni_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 (nd->ni_vp)
 456                 vrele(nd->ni_vp);
 457
 458         free(tempdata, M_TEMP);
 459
 460         return error;
 461 }
 462
 463 /*
 464  * non static, as it can be overridden by start_init()
 465  */
 466 int fallback_elf_brand = -1;
 467 SYSCTL_INT(_kern, OID_AUTO, fallback_elf_brand, CTLFLAG_RW,
 468                 &fallback_elf_brand, -1,
 469                 "ELF brand of last resort");
 470
 471 static int
 472 exec_elf_imgact(struct image_params *imgp)
 473 {
 474         const Elf_Ehdr *hdr = (const Elf_Ehdr *) imgp->image_header;
 475         const Elf_Phdr *phdr;
 476         Elf_Auxargs *elf_auxargs = NULL;
 477         struct vmspace *vmspace;
 478         vm_prot_t prot;
 479         u_long text_size = 0, data_size = 0, total_size = 0;
 480         u_long text_addr = 0, data_addr = 0;
 481         u_long seg_size, seg_addr;
 482         u_long addr, entry = 0, proghdr = 0;
 483         int error, i;
 484         const char *interp = NULL;
 485         Elf_Brandinfo *brand_info;
 486         char *path;
 487         lwkt_tokref ilock;
 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         lwkt_gettoken(&ilock, imgp->vp->v_interlock);
 522         imgp->vp->v_flag |= VTEXT;
 523         lwkt_reltoken(&ilock);
 524
 525         vmspace = imgp->proc->p_vmspace;
 526
 527         for (i = 0; i < hdr->e_phnum; i++) {
 528                 switch(phdr[i].p_type) {
 529
 530                 case PT_LOAD:   /* Loadable segment */
 531                         prot = 0;
 532                         if (phdr[i].p_flags & PF_X)
 533                                 prot |= VM_PROT_EXECUTE;
 534                         if (phdr[i].p_flags & PF_W)
 535                                 prot |= VM_PROT_WRITE;
 536                         if (phdr[i].p_flags & PF_R)
 537                                 prot |= VM_PROT_READ;
 538
 539                         if ((error = elf_load_section(imgp->proc,
 540                                                      vmspace, imgp->vp,
 541                                                      phdr[i].p_offset,
 542                                                      (caddr_t)phdr[i].p_vaddr,
 543                                                      phdr[i].p_memsz,
 544                                                      phdr[i].p_filesz, prot)) != 0)
 545                                 goto fail;
 546
 547                         seg_addr = trunc_page(phdr[i].p_vaddr);
 548                         seg_size = round_page(phdr[i].p_memsz +
 549                                 phdr[i].p_vaddr - seg_addr);
 550
 551                         /*
 552                          * Is this .text or .data?  We can't use
 553                          * VM_PROT_WRITE or VM_PROT_EXEC, it breaks the
 554                          * alpha terribly and possibly does other bad
 555                          * things so we stick to the old way of figuring
 556                          * it out:  If the segment contains the program
 557                          * entry point, it's a text segment, otherwise it
 558                          * is a data segment.
 559                          *
 560                          * Note that obreak() assumes that data_addr +
 561                          * data_size == end of data load area, and the ELF
 562                          * file format expects segments to be sorted by
 563                          * address.  If multiple data segments exist, the
 564                          * last one will be used.
 565                          */
 566                         if (hdr->e_entry >= phdr[i].p_vaddr &&
 567                             hdr->e_entry < (phdr[i].p_vaddr +
 568                             phdr[i].p_memsz)) {
 569                                 text_size = seg_size;
 570                                 text_addr = seg_addr;
 571                                 entry = (u_long)hdr->e_entry;
 572                         } else {
 573                                 data_size = seg_size;
 574                                 data_addr = seg_addr;
 575                         }
 576                         total_size += seg_size;
 577
 578                         /*
 579                          * Check limits.  It should be safe to check the
 580                          * limits after loading the segment since we do
 581                          * not actually fault in all the segment's pages.
 582                          */
 583                         if (data_size >
 584                             imgp->proc->p_rlimit[RLIMIT_DATA].rlim_cur ||
 585                             text_size > maxtsiz ||
 586                             total_size >
 587                             imgp->proc->p_rlimit[RLIMIT_VMEM].rlim_cur) {
 588                                 error = ENOMEM;
 589                                 goto fail;
 590                         }
 591                         break;
 592                 case PT_INTERP: /* Path to interpreter */
 593                         if (phdr[i].p_filesz > MAXPATHLEN ||
 594                             phdr[i].p_offset + phdr[i].p_filesz > PAGE_SIZE) {
 595                                 error = ENOEXEC;
 596                                 goto fail;
 597                         }
 598                         interp = imgp->image_header + phdr[i].p_offset;
 599                         break;
 600                 case PT_PHDR:   /* Program header table info */
 601                         proghdr = phdr[i].p_vaddr;
 602                         break;
 603                 default:
 604                         break;
 605                 }
 606         }
 607
 608         vmspace->vm_tsize = text_size >> PAGE_SHIFT;
 609         vmspace->vm_taddr = (caddr_t)(uintptr_t)text_addr;
 610         vmspace->vm_dsize = data_size >> PAGE_SHIFT;
 611         vmspace->vm_daddr = (caddr_t)(uintptr_t)data_addr;
 612
 613         addr = ELF_RTLD_ADDR(vmspace);
 614
 615         imgp->entry_addr = entry;
 616
 617         brand_info = NULL;
 618
 619         /* We support three types of branding -- (1) the ELF EI_OSABI field
 620          * that SCO added to the ELF spec, (2) FreeBSD 3.x's traditional string
 621          * branding w/in the ELF header, and (3) path of the `interp_path'
 622          * field.  We should also look for an ".note.ABI-tag" ELF section now
 623          * in all Linux ELF binaries, FreeBSD 4.1+, and some NetBSD ones.
 624          */
 625
 626         /* If the executable has a brand, search for it in the brand list. */
 627         if (brand_info == NULL) {
 628                 for (i = 0;  i < MAX_BRANDS;  i++) {
 629                         Elf_Brandinfo *bi = elf_brand_list[i];
 630
 631                         if (bi != NULL &&
 632                             (hdr->e_ident[EI_OSABI] == bi->brand
 633                             || 0 ==
 634                             strncmp((const char *)&hdr->e_ident[OLD_EI_BRAND],
 635                             bi->compat_3_brand, strlen(bi->compat_3_brand)))) {
 636                                 brand_info = bi;
 637                                 break;
 638                         }
 639                 }
 640         }
 641
 642         /* Lacking a known brand, search for a recognized interpreter. */
 643         if (brand_info == NULL && interp != NULL) {
 644                 for (i = 0;  i < MAX_BRANDS;  i++) {
 645                         Elf_Brandinfo *bi = elf_brand_list[i];
 646
 647                         if (bi != NULL &&
 648                             strcmp(interp, bi->interp_path) == 0) {
 649                                 brand_info = bi;
 650                                 break;
 651                         }
 652                 }
 653         }
 654
 655         /* Lacking a recognized interpreter, try the default brand */
 656         if (brand_info == NULL) {
 657                 for (i = 0; i < MAX_BRANDS; i++) {
 658                         Elf_Brandinfo *bi = elf_brand_list[i];
 659
 660                         if (bi != NULL && fallback_elf_brand == bi->brand) {
 661                                 brand_info = bi;
 662                                 break;
 663                         }
 664                 }
 665         }
 666
 667         if (brand_info == NULL) {
 668                 uprintf("ELF binary type \"%u\" not known.\n",
 669                     hdr->e_ident[EI_OSABI]);
 670                 error = ENOEXEC;
 671                 goto fail;
 672         }
 673
 674         imgp->proc->p_sysent = brand_info->sysvec;
 675         if (interp != NULL) {
 676                 path = malloc(MAXPATHLEN, M_TEMP, M_WAITOK);
 677                 snprintf(path, MAXPATHLEN, "%s%s",
 678                          brand_info->emul_path, interp);
 679                 if ((error = elf_load_file(imgp->proc, path, &addr,
 680                                            &imgp->entry_addr)) != 0) {
 681                         if ((error = elf_load_file(imgp->proc, interp, &addr,
 682                                                    &imgp->entry_addr)) != 0) {
 683                                 uprintf("ELF interpreter %s not found\n", path);
 684                                 free(path, M_TEMP);
 685                                 goto fail;
 686                         }
 687                 }
 688                 free(path, M_TEMP);
 689         }
 690
 691         /*
 692          * Construct auxargs table (used by the fixup routine)
 693          */
 694         elf_auxargs = malloc(sizeof(Elf_Auxargs), M_TEMP, M_WAITOK);
 695         elf_auxargs->execfd = -1;
 696         elf_auxargs->phdr = proghdr;
 697         elf_auxargs->phent = hdr->e_phentsize;
 698         elf_auxargs->phnum = hdr->e_phnum;
 699         elf_auxargs->pagesz = PAGE_SIZE;
 700         elf_auxargs->base = addr;
 701         elf_auxargs->flags = 0;
 702         elf_auxargs->entry = entry;
 703         elf_auxargs->trace = elf_trace;
 704
 705         imgp->auxargs = elf_auxargs;
 706         imgp->interpreted = 0;
 707
 708 fail:
 709         return error;
 710 }
 711
 712 static int
 713 elf_freebsd_fixup(register_t **stack_base, struct image_params *imgp)
 714 {
 715         Elf_Auxargs *args = (Elf_Auxargs *)imgp->auxargs;
 716         register_t *pos;
 717
 718         pos = *stack_base + (imgp->args->argc + imgp->args->envc + 2);
 719
 720         if (args->trace) {
 721                 AUXARGS_ENTRY(pos, AT_DEBUG, 1);
 722         }
 723         if (args->execfd != -1) {
 724                 AUXARGS_ENTRY(pos, AT_EXECFD, args->execfd);
 725         }
 726         AUXARGS_ENTRY(pos, AT_PHDR, args->phdr);
 727         AUXARGS_ENTRY(pos, AT_PHENT, args->phent);
 728         AUXARGS_ENTRY(pos, AT_PHNUM, args->phnum);
 729         AUXARGS_ENTRY(pos, AT_PAGESZ, args->pagesz);
 730         AUXARGS_ENTRY(pos, AT_FLAGS, args->flags);
 731         AUXARGS_ENTRY(pos, AT_ENTRY, args->entry);
 732         AUXARGS_ENTRY(pos, AT_BASE, args->base);
 733         AUXARGS_ENTRY(pos, AT_NULL, 0);
 734
 735         free(imgp->auxargs, M_TEMP);
 736         imgp->auxargs = NULL;
 737
 738         (*stack_base)--;
 739         suword(*stack_base, (long) imgp->args->argc);
 740         return 0;
 741 }
 742
 743 /*
 744  * Code for generating ELF core dumps.
 745  */
 746
 747 typedef int (*segment_callback) (vm_map_entry_t, void *);
 748
 749 /* Closure for cb_put_phdr(). */
 750 struct phdr_closure {
 751         Elf_Phdr *phdr;         /* Program header to fill in (incremented) */
 752         Elf_Phdr *phdr_max;     /* Pointer bound for error check */
 753         Elf_Off offset;         /* Offset of segment in core file */
 754 };
 755
 756 /* Closure for cb_size_segment(). */
 757 struct sseg_closure {
 758         int count;              /* Count of writable segments. */
 759         size_t vsize;           /* Total size of all writable segments. */
 760 };
 761
 762 /* Closure for cb_put_fp(). */
 763 struct fp_closure {
 764         struct vn_hdr *vnh;
 765         struct vn_hdr *vnh_max;
 766         int count;
 767         struct stat *sb;
 768 };
 769
 770 typedef struct elf_buf {
 771         char    *buf;
 772         size_t  off;
 773         size_t  off_max;
 774 } *elf_buf_t;
 775
 776 static void *target_reserve(elf_buf_t target, size_t bytes, int *error);
 777
 778 static int cb_put_phdr (vm_map_entry_t, void *);
 779 static int cb_size_segment (vm_map_entry_t, void *);
 780 static int cb_fpcount_segment(vm_map_entry_t, void *);
 781 static int cb_put_fp(vm_map_entry_t, void *);
 782
 783
 784 static int each_segment (struct proc *, segment_callback, void *, int);
 785 static int elf_corehdr (struct proc *, struct file *, struct ucred *,
 786                         int, elf_buf_t);
 787 static int elf_puthdr (struct proc *, elf_buf_t, const prstatus_t *,
 788                         const prfpregset_t *, const prpsinfo_t *, int);
 789 static int elf_putnote (elf_buf_t, const char *, int, const void *, size_t);
 790
 791 static int elf_putsigs(struct proc *, elf_buf_t);
 792 static int elf_puttextvp(struct proc *, elf_buf_t);
 793 static int elf_putfiles(struct proc *, elf_buf_t);
 794
 795 extern int osreldate;
 796
 797 int
 798 elf_coredump(struct proc *p, struct vnode *vp, off_t limit)
 799 {
 800         struct file *fp;
 801         int error;
 802
 803         if ((error = falloc(NULL, &fp, NULL)) != 0)
 804                 return (error);
 805         fsetcred(fp, p->p_ucred);
 806
 807         fp->f_data = (caddr_t)vp;
 808         fp->f_flag = O_CREAT|O_WRONLY|O_NOFOLLOW;
 809         fp->f_ops = &vnops;
 810         fp->f_type = DTYPE_VNODE;
 811         VOP_UNLOCK(vp, NULL, 0, p->p_thread);
 812
 813         error = generic_elf_coredump(p, fp, limit);
 814
 815         fp->f_data = NULL;
 816         fp->f_flag = 0;
 817         fp->f_ops = &badfileops;
 818         fp->f_type = 0;
 819         fdrop(fp, p->p_thread);
 820         return (error);
 821 }
 822
 823 int
 824 generic_elf_coredump(struct proc *p, struct file *fp, off_t limit)
 825 {
 826         struct ucred *cred = p->p_ucred;
 827         int error = 0;
 828         struct sseg_closure seginfo;
 829         struct elf_buf target;
 830
 831         if (!fp)
 832                 printf("can't dump core - null fp\n");
 833
 834         /*
 835          * Size the program segments
 836          */
 837         seginfo.count = 0;
 838         seginfo.vsize = 0;
 839         each_segment(p, cb_size_segment, &seginfo, 1);
 840
 841         /*
 842          * Calculate the size of the core file header area by making
 843          * a dry run of generating it.  Nothing is written, but the
 844          * size is calculated.
 845          */
 846         bzero(&target, sizeof(target));
 847         elf_puthdr(p, &target, NULL, NULL, NULL, seginfo.count);
 848
 849         if (target.off + seginfo.vsize >= limit)
 850                 return (EFAULT);
 851
 852         /*
 853          * Allocate memory for building the header, fill it up,
 854          * and write it out.
 855          */
 856         target.off_max = target.off;
 857         target.off = 0;
 858         target.buf = malloc(target.off_max, M_TEMP, M_WAITOK|M_ZERO);
 859
 860         if (target.buf == NULL)
 861                 return EINVAL;
 862         error = elf_corehdr(p, fp, cred, seginfo.count, &target);
 863
 864         /* Write the contents of all of the writable segments. */
 865         if (error == 0) {
 866                 Elf_Phdr *php;
 867                 int i;
 868                 int nbytes;
 869
 870                 php = (Elf_Phdr *)(target.buf + sizeof(Elf_Ehdr)) + 1;
 871                 for (i = 0; i < seginfo.count; i++) {
 872                         error = fp_write(fp, (caddr_t)php->p_vaddr,
 873                                         php->p_filesz, &nbytes);
 874                         if (error != 0)
 875                                 break;
 876                         php++;
 877                 }
 878         }
 879         free(target.buf, M_TEMP);
 880
 881         return error;
 882 }
 883
 884 /*
 885  * A callback for each_segment() to write out the segment's
 886  * program header entry.
 887  */
 888 static int
 889 cb_put_phdr(vm_map_entry_t entry, void *closure)
 890 {
 891         struct phdr_closure *phc = closure;
 892         Elf_Phdr *phdr = phc->phdr;
 893
 894         if (phc->phdr == phc->phdr_max)
 895                 return EINVAL;
 896
 897         phc->offset = round_page(phc->offset);
 898
 899         phdr->p_type = PT_LOAD;
 900         phdr->p_offset = phc->offset;
 901         phdr->p_vaddr = entry->start;
 902         phdr->p_paddr = 0;
 903         phdr->p_filesz = phdr->p_memsz = entry->end - entry->start;
 904         phdr->p_align = PAGE_SIZE;
 905         phdr->p_flags = 0;
 906         if (entry->protection & VM_PROT_READ)
 907                 phdr->p_flags |= PF_R;
 908         if (entry->protection & VM_PROT_WRITE)
 909                 phdr->p_flags |= PF_W;
 910         if (entry->protection & VM_PROT_EXECUTE)
 911                 phdr->p_flags |= PF_X;
 912
 913         phc->offset += phdr->p_filesz;
 914         ++phc->phdr;
 915         return 0;
 916 }
 917
 918 /*
 919  * A callback for each_writable_segment() to gather information about
 920  * the number of segments and their total size.
 921  */
 922 static int
 923 cb_size_segment(vm_map_entry_t entry, void *closure)
 924 {
 925         struct sseg_closure *ssc = closure;
 926
 927         ++ssc->count;
 928         ssc->vsize += entry->end - entry->start;
 929         return 0;
 930 }
 931
 932 /*
 933  * A callback for each_segment() to gather information about
 934  * the number of text segments.
 935  */
 936 static int
 937 cb_fpcount_segment(vm_map_entry_t entry, void *closure)
 938 {
 939         int *count = closure;
 940         if (entry->object.vm_object->type == OBJT_VNODE)
 941                 ++*count;
 942         return 0;
 943 }
 944
 945 static int
 946 cb_put_fp(vm_map_entry_t entry, void *closure)
 947 {
 948         struct fp_closure *fpc = closure;
 949         struct vn_hdr *vnh = fpc->vnh;
 950         Elf_Phdr *phdr = &vnh->vnh_phdr;
 951         struct vnode *vp;
 952         int error;
 953
 954         if (entry->object.vm_object->type == OBJT_VNODE) {
 955                 if (vnh == fpc->vnh_max)
 956                         return EINVAL;
 957                 vp = (struct vnode *)entry->object.vm_object->handle;
 958
 959                 if (vp->v_mount)
 960                         vnh->vnh_fh.fh_fsid = vp->v_mount->mnt_stat.f_fsid;
 961                 error = VFS_VPTOFH(vp, &vnh->vnh_fh.fh_fid);
 962                 if (error)
 963                         return error;
 964
 965                 phdr->p_type = PT_LOAD;
 966                 phdr->p_offset = 0;        /* not written to core */
 967                 phdr->p_vaddr = entry->start;
 968                 phdr->p_paddr = 0;
 969                 phdr->p_filesz = phdr->p_memsz = entry->end - entry->start;
 970                 phdr->p_align = PAGE_SIZE;
 971                 phdr->p_flags = 0;
 972                 if (entry->protection & VM_PROT_READ)
 973                         phdr->p_flags |= PF_R;
 974                 if (entry->protection & VM_PROT_WRITE)
 975                         phdr->p_flags |= PF_W;
 976                 if (entry->protection & VM_PROT_EXECUTE)
 977                         phdr->p_flags |= PF_X;
 978                 ++fpc->vnh;
 979                 ++fpc->count;
 980         }
 981         return 0;
 982 }
 983
 984 /*
 985  * For each writable segment in the process's memory map, call the given
 986  * function with a pointer to the map entry and some arbitrary
 987  * caller-supplied data.
 988  */
 989 static int
 990 each_segment(struct proc *p, segment_callback func, void *closure, int writable)
 991 {
 992         int error = 0;
 993         vm_map_t map = &p->p_vmspace->vm_map;
 994         vm_map_entry_t entry;
 995
 996         for (entry = map->header.next; error == 0 && 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                 error = (*func)(entry, closure);
1039         }
1040         return error;
1041 }
1042
1043 static
1044 void *
1045 target_reserve(elf_buf_t target, size_t bytes, int *error)
1046 {
1047     void *res = NULL;
1048
1049     if (target->buf) {
1050             if (target->off + bytes > target->off_max)
1051                     *error = EINVAL;
1052             else
1053                     res = target->buf + target->off;
1054     }
1055     target->off += bytes;
1056     return (res);
1057 }
1058
1059 /*
1060  * Write the core file header to the file, including padding up to
1061  * the page boundary.
1062  */
1063 static int
1064 elf_corehdr(struct proc *p, struct file *fp, struct ucred *cred, int numsegs,
1065             elf_buf_t target)
1066 {
1067         struct {
1068                 prstatus_t status;
1069                 prfpregset_t fpregset;
1070                 prpsinfo_t psinfo;
1071         } *tempdata;
1072         int error;
1073         prstatus_t *status;
1074         prfpregset_t *fpregset;
1075         prpsinfo_t *psinfo;
1076         int nbytes;
1077         tempdata = malloc(sizeof(*tempdata), M_TEMP, M_ZERO | M_WAITOK);
1078         status = &tempdata->status;
1079         fpregset = &tempdata->fpregset;
1080         psinfo = &tempdata->psinfo;
1081
1082         /* Gather the information for the header. */
1083         status->pr_version = PRSTATUS_VERSION;
1084         status->pr_statussz = sizeof(prstatus_t);
1085         status->pr_gregsetsz = sizeof(gregset_t);
1086         status->pr_fpregsetsz = sizeof(fpregset_t);
1087         status->pr_osreldate = osreldate;
1088         status->pr_cursig = p->p_sig;
1089         status->pr_pid = p->p_pid;
1090         fill_regs(p, &status->pr_reg);
1091
1092         fill_fpregs(p, fpregset);
1093
1094         psinfo->pr_version = PRPSINFO_VERSION;
1095         psinfo->pr_psinfosz = sizeof(prpsinfo_t);
1096         strncpy(psinfo->pr_fname, p->p_comm, sizeof(psinfo->pr_fname) - 1);
1097
1098         /* XXX - We don't fill in the command line arguments properly yet. */
1099         strncpy(psinfo->pr_psargs, p->p_comm, PRARGSZ);
1100
1101         /* Fill in the header. */
1102         error = elf_puthdr(p, target, status, fpregset, psinfo, numsegs);
1103
1104         free(tempdata, M_TEMP);
1105
1106         /* Write it to the core file. */
1107         if (error == 0)
1108                 error = fp_write(fp, target->buf, target->off, &nbytes);
1109         return error;
1110 }
1111
1112 static int
1113 elf_puthdr(struct proc *p, elf_buf_t target, const prstatus_t *status,
1114         const prfpregset_t *fpregset, const prpsinfo_t *psinfo, int numsegs)
1115 {
1116         int error = 0;
1117         size_t phoff;
1118         size_t noteoff;
1119         size_t notesz;
1120         Elf_Ehdr *ehdr;
1121         Elf_Phdr *phdr;
1122
1123         ehdr = target_reserve(target, sizeof(Elf_Ehdr), &error);
1124
1125         phoff = target->off;
1126         phdr = target_reserve(target, (numsegs + 1) * sizeof(Elf_Phdr), &error);
1127
1128         noteoff = target->off;
1129         if (error == 0) {
1130                 error = elf_putnote(target, "FreeBSD", NT_PRSTATUS,
1131                                         status, sizeof *status);
1132         }
1133         if (error == 0) {
1134                 error = elf_putnote(target, "FreeBSD", NT_FPREGSET,
1135                                         fpregset, sizeof *fpregset);
1136         }
1137         if (error == 0) {
1138                 error = elf_putnote(target, "FreeBSD", NT_PRPSINFO,
1139                                         psinfo, sizeof *psinfo);
1140         }
1141         notesz = target->off - noteoff;
1142
1143         /*
1144          * put extra cruft for dumping process state here
1145          *  - we really want it be before all the program
1146          *    mappings
1147          *  - we just need to update the offset accordingly
1148          *    and GDB will be none the wiser.
1149          */
1150         if (error == 0)
1151                 error = elf_puttextvp(p, target);
1152         if (error == 0)
1153                 error = elf_putsigs(p, target);
1154         if (error == 0)
1155                 error = elf_putfiles(p, target);
1156
1157         /*
1158          * Align up to a page boundary for the program segments.  The
1159          * actual data will be written to the outptu file, not to elf_buf_t,
1160          * so we do not have to do any further bounds checking.
1161          */
1162         target->off = round_page(target->off);
1163         if (error == 0 && ehdr != NULL) {
1164                 /*
1165                  * Fill in the ELF header.
1166                  */
1167                 ehdr->e_ident[EI_MAG0] = ELFMAG0;
1168                 ehdr->e_ident[EI_MAG1] = ELFMAG1;
1169                 ehdr->e_ident[EI_MAG2] = ELFMAG2;
1170                 ehdr->e_ident[EI_MAG3] = ELFMAG3;
1171                 ehdr->e_ident[EI_CLASS] = ELF_CLASS;
1172                 ehdr->e_ident[EI_DATA] = ELF_DATA;
1173                 ehdr->e_ident[EI_VERSION] = EV_CURRENT;
1174                 ehdr->e_ident[EI_OSABI] = ELFOSABI_FREEBSD;
1175                 ehdr->e_ident[EI_ABIVERSION] = 0;
1176                 ehdr->e_ident[EI_PAD] = 0;
1177                 ehdr->e_type = ET_CORE;
1178                 ehdr->e_machine = ELF_ARCH;
1179                 ehdr->e_version = EV_CURRENT;
1180                 ehdr->e_entry = 0;
1181                 ehdr->e_phoff = phoff;
1182                 ehdr->e_flags = 0;
1183                 ehdr->e_ehsize = sizeof(Elf_Ehdr);
1184                 ehdr->e_phentsize = sizeof(Elf_Phdr);
1185                 ehdr->e_phnum = numsegs + 1;
1186                 ehdr->e_shentsize = sizeof(Elf_Shdr);
1187                 ehdr->e_shnum = 0;
1188                 ehdr->e_shstrndx = SHN_UNDEF;
1189         }
1190         if (error == 0 && phdr != NULL) {
1191                 /*
1192                  * Fill in the program header entries.
1193                  */
1194                 struct phdr_closure phc;
1195
1196                 /* The note segement. */
1197                 phdr->p_type = PT_NOTE;
1198                 phdr->p_offset = noteoff;
1199                 phdr->p_vaddr = 0;
1200                 phdr->p_paddr = 0;
1201                 phdr->p_filesz = notesz;
1202                 phdr->p_memsz = 0;
1203                 phdr->p_flags = 0;
1204                 phdr->p_align = 0;
1205                 ++phdr;
1206
1207                 /* All the writable segments from the program. */
1208                 phc.phdr = phdr;
1209                 phc.phdr_max = phdr + numsegs;
1210                 phc.offset = target->off;
1211                 each_segment(p, cb_put_phdr, &phc, 1);
1212         }
1213         return (error);
1214 }
1215
1216 static int
1217 elf_putnote(elf_buf_t target, const char *name, int type,
1218             const void *desc, size_t descsz)
1219 {
1220         int error = 0;
1221         char *dst;
1222         Elf_Note note;
1223
1224         note.n_namesz = strlen(name) + 1;
1225         note.n_descsz = descsz;
1226         note.n_type = type;
1227         dst = target_reserve(target, sizeof(note), &error);
1228         if (dst != NULL)
1229                 bcopy(&note, dst, sizeof note);
1230         dst = target_reserve(target, note.n_namesz, &error);
1231         if (dst != NULL)
1232                 bcopy(name, dst, note.n_namesz);
1233         target->off = roundup2(target->off, sizeof(Elf_Size));
1234         dst = target_reserve(target, note.n_descsz, &error);
1235         if (dst != NULL)
1236                 bcopy(desc, dst, note.n_descsz);
1237         target->off = roundup2(target->off, sizeof(Elf_Size));
1238         return(error);
1239 }
1240
1241
1242 static int
1243 elf_putsigs(struct proc *p, elf_buf_t target)
1244 {
1245         int error = 0;
1246         struct ckpt_siginfo *csi;
1247
1248         csi = target_reserve(target, sizeof(struct ckpt_siginfo), &error);
1249         if (csi) {
1250                 csi->csi_ckptpisz = sizeof(struct ckpt_siginfo);
1251                 bcopy(p->p_procsig, &csi->csi_procsig, sizeof(struct procsig));
1252                 bcopy(p->p_procsig->ps_sigacts, &csi->csi_sigacts, sizeof(struct sigacts));
1253                 bcopy(&p->p_realtimer, &csi->csi_itimerval, sizeof(struct itimerval));
1254                 csi->csi_sigparent = p->p_sigparent;
1255         }
1256         return(error);
1257 }
1258
1259 static int
1260 elf_putfiles(struct proc *p, elf_buf_t target)
1261 {
1262         int error = 0;
1263         int i;
1264         struct ckpt_filehdr *cfh = NULL;
1265         struct ckpt_fileinfo *cfi;
1266         struct file *fp;
1267         struct vnode *vp;
1268         /*
1269          * the duplicated loop is gross, but it was the only way
1270          * to eliminate uninitialized variable warnings
1271          */
1272         cfh = target_reserve(target, sizeof(struct ckpt_filehdr), &error);
1273         if (cfh) {
1274                 cfh->cfh_nfiles = 0;
1275         }
1276
1277         /*
1278          * ignore STDIN/STDERR/STDOUT
1279          */
1280         for (i = 3; error == 0 && i < p->p_fd->fd_nfiles; i++) {
1281                 if ((fp = p->p_fd->fd_ofiles[i]) == NULL)
1282                         continue;
1283                 if (fp->f_type != DTYPE_VNODE)
1284                         continue;
1285                 cfi = target_reserve(target, sizeof(struct ckpt_fileinfo), &error);
1286                 if (cfi) {
1287                         cfi->cfi_index = -1;
1288                         vp = (struct vnode *)fp->f_data;
1289                         /*
1290                          * it looks like a bug in ptrace is marking
1291                          * a non-vnode as a vnode - until we find the
1292                          * root cause this will at least prevent
1293                          * further panics from truss
1294                          */
1295                         if (vp == NULL || vp->v_mount == NULL)
1296                                 continue;
1297                         cfh->cfh_nfiles++;
1298                         cfi->cfi_index = i;
1299                         cfi->cfi_flags = fp->f_flag;
1300                         cfi->cfi_offset = fp->f_offset;
1301                         cfi->cfi_fh.fh_fsid = vp->v_mount->mnt_stat.f_fsid;
1302                         error = VFS_VPTOFH(vp, &cfi->cfi_fh.fh_fid);
1303                 }
1304         }
1305         return(error);
1306 }
1307
1308 static int
1309 elf_puttextvp(struct proc *p, elf_buf_t target)
1310 {
1311         int error = 0;
1312         int *vn_count;
1313         struct fp_closure fpc;
1314         struct ckpt_vminfo *vminfo;
1315
1316         vminfo = target_reserve(target, sizeof(struct ckpt_vminfo), &error);
1317         if (vminfo != NULL) {
1318                 vminfo->cvm_dsize = p->p_vmspace->vm_dsize;
1319                 vminfo->cvm_tsize = p->p_vmspace->vm_tsize;
1320                 vminfo->cvm_daddr = p->p_vmspace->vm_daddr;
1321                 vminfo->cvm_taddr = p->p_vmspace->vm_taddr;
1322         }
1323
1324         fpc.count = 0;
1325         vn_count = target_reserve(target, sizeof(int), &error);
1326         if (target->buf != NULL) {
1327                 fpc.vnh = (struct vn_hdr *)(target->buf + target->off);
1328                 fpc.vnh_max = fpc.vnh +
1329                         (target->off_max - target->off) / sizeof(struct vn_hdr);
1330                 error = each_segment(p, cb_put_fp, &fpc, 0);
1331                 if (vn_count)
1332                         *vn_count = fpc.count;
1333         } else {
1334                 error = each_segment(p, cb_fpcount_segment, &fpc.count, 0);
1335         }
1336         target->off += fpc.count * sizeof(struct vn_hdr);
1337         return(error);
1338 }
1339
1340
1341 /*
1342  * Tell kern_execve.c about it, with a little help from the linker.
1343  */
1344 static struct execsw elf_execsw = {exec_elf_imgact, "ELF"};
1345 EXEC_SET_ORDERED(elf, elf_execsw, SI_ORDER_FIRST);