1 /*- 2 * Copyright (c) 1995-1996 S�ren Schmidt 3 * Copyright (c) 1996 Peter Wemm 4 * All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer 11 * in this position and unchanged. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. The name of the author may not be used to endorse or promote products 16 * derived from this software withough specific prior written permission 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 19 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 20 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 21 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 22 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 23 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 24 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 25 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 26 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 27 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 28 * 29 * $FreeBSD: src/sys/kern/imgact_elf.c,v 1.73.2.13 2002/12/28 19:49:41 dillon Exp $ 30 * $DragonFly: src/sys/kern/imgact_elf.c,v 1.26 2005/03/08 12:30:32 davidxu Exp $ 31 */ 32 33 #include <sys/param.h> 34 #include <sys/exec.h> 35 #include <sys/fcntl.h> 36 #include <sys/file.h> 37 #include <sys/imgact.h> 38 #include <sys/imgact_elf.h> 39 #include <sys/kernel.h> 40 #include <sys/malloc.h> 41 #include <sys/mman.h> 42 #include <sys/systm.h> 43 #include <sys/proc.h> 44 #include <sys/nlookup.h> 45 #include <sys/pioctl.h> 46 #include <sys/procfs.h> 47 #include <sys/resourcevar.h> 48 #include <sys/signalvar.h> 49 #include <sys/stat.h> 50 #include <sys/syscall.h> 51 #include <sys/sysctl.h> 52 #include <sys/sysent.h> 53 #include <sys/vnode.h> 54 55 #include <vm/vm.h> 56 #include <vm/vm_kern.h> 57 #include <vm/vm_param.h> 58 #include <vm/pmap.h> 59 #include <sys/lock.h> 60 #include <vm/vm_map.h> 61 #include <vm/vm_object.h> 62 #include <vm/vm_extern.h> 63 64 #include <machine/elf.h> 65 #include <machine/md_var.h> 66 #include <sys/mount.h> 67 #include <sys/ckpt.h> 68 #define OLD_EI_BRAND 8 69 70 __ElfType(Brandinfo); 71 __ElfType(Auxargs); 72 73 static int elf_check_header (const Elf_Ehdr *hdr); 74 static int elf_freebsd_fixup (register_t **stack_base, 75 struct image_params *imgp); 76 static int elf_load_file (struct proc *p, const char *file, u_long *addr, 77 u_long *entry); 78 static int elf_load_section (struct proc *p, 79 struct vmspace *vmspace, struct vnode *vp, 80 vm_offset_t offset, caddr_t vmaddr, size_t memsz, size_t filsz, 81 vm_prot_t prot); 82 static int exec_elf_imgact (struct image_params *imgp); 83 84 static int elf_trace = 0; 85 SYSCTL_INT(_debug, OID_AUTO, elf_trace, CTLFLAG_RW, &elf_trace, 0, ""); 86 static int elf_legacy_coredump = 0; 87 SYSCTL_INT(_debug, OID_AUTO, elf_legacy_coredump, CTLFLAG_RW, 88 &elf_legacy_coredump, 0, ""); 89 90 static struct sysentvec elf_freebsd_sysvec = { 91 SYS_MAXSYSCALL, 92 sysent, 93 -1, 94 0, 95 0, 96 0, 97 0, 98 0, 99 elf_freebsd_fixup, 100 sendsig, 101 sigcode, 102 &szsigcode, 103 0, 104 "FreeBSD ELF", 105 elf_coredump, 106 NULL, 107 MINSIGSTKSZ 108 }; 109 110 static Elf_Brandinfo freebsd_brand_info = { 111 ELFOSABI_FREEBSD, 112 "FreeBSD", 113 "", 114 "/usr/libexec/ld-elf.so.1", 115 &elf_freebsd_sysvec 116 }; 117 static Elf_Brandinfo *elf_brand_list[MAX_BRANDS] = { 118 &freebsd_brand_info, 119 NULL, NULL, NULL, 120 NULL, NULL, NULL, NULL 121 }; 122 123 int 124 elf_insert_brand_entry(Elf_Brandinfo *entry) 125 { 126 int i; 127 128 for (i=1; i<MAX_BRANDS; i++) { 129 if (elf_brand_list[i] == NULL) { 130 elf_brand_list[i] = entry; 131 break; 132 } 133 } 134 if (i == MAX_BRANDS) 135 return -1; 136 return 0; 137 } 138 139 int 140 elf_remove_brand_entry(Elf_Brandinfo *entry) 141 { 142 int i; 143 144 for (i=1; i<MAX_BRANDS; i++) { 145 if (elf_brand_list[i] == entry) { 146 elf_brand_list[i] = NULL; 147 break; 148 } 149 } 150 if (i == MAX_BRANDS) 151 return -1; 152 return 0; 153 } 154 155 int 156 elf_brand_inuse(Elf_Brandinfo *entry) 157 { 158 struct proc *p; 159 int rval = FALSE; 160 161 FOREACH_PROC_IN_SYSTEM(p) { 162 if (p->p_sysent == entry->sysvec) { 163 rval = TRUE; 164 break; 165 } 166 } 167 168 return (rval); 169 } 170 171 static int 172 elf_check_header(const Elf_Ehdr *hdr) 173 { 174 if (!IS_ELF(*hdr) || 175 hdr->e_ident[EI_CLASS] != ELF_TARG_CLASS || 176 hdr->e_ident[EI_DATA] != ELF_TARG_DATA || 177 hdr->e_ident[EI_VERSION] != EV_CURRENT || 178 hdr->e_phentsize != sizeof(Elf_Phdr) || 179 hdr->e_ehsize != sizeof(Elf_Ehdr) || 180 hdr->e_version != ELF_TARG_VER) 181 return ENOEXEC; 182 183 if (!ELF_MACHINE_OK(hdr->e_machine)) 184 return ENOEXEC; 185 186 return 0; 187 } 188 189 static int 190 elf_load_section(struct proc *p, struct vmspace *vmspace, struct vnode *vp, 191 vm_offset_t offset, caddr_t vmaddr, size_t memsz, size_t filsz, 192 vm_prot_t prot) 193 { 194 size_t map_len; 195 vm_offset_t map_addr; 196 int error, rv, cow; 197 int count; 198 size_t copy_len; 199 vm_object_t object; 200 vm_offset_t file_addr; 201 vm_offset_t data_buf = 0; 202 203 VOP_GETVOBJECT(vp, &object); 204 error = 0; 205 206 /* 207 * It's necessary to fail if the filsz + offset taken from the 208 * header is greater than the actual file pager object's size. 209 * If we were to allow this, then the vm_map_find() below would 210 * walk right off the end of the file object and into the ether. 211 * 212 * While I'm here, might as well check for something else that 213 * is invalid: filsz cannot be greater than memsz. 214 */ 215 if ((off_t)filsz + offset > object->un_pager.vnp.vnp_size || 216 filsz > memsz) { 217 uprintf("elf_load_section: truncated ELF file\n"); 218 return (ENOEXEC); 219 } 220 221 map_addr = trunc_page((vm_offset_t)vmaddr); 222 file_addr = trunc_page(offset); 223 224 /* 225 * We have two choices. We can either clear the data in the last page 226 * of an oversized mapping, or we can start the anon mapping a page 227 * early and copy the initialized data into that first page. We 228 * choose the second.. 229 */ 230 if (memsz > filsz) 231 map_len = trunc_page(offset+filsz) - file_addr; 232 else 233 map_len = round_page(offset+filsz) - file_addr; 234 235 if (map_len != 0) { 236 vm_object_reference(object); 237 238 /* cow flags: don't dump readonly sections in core */ 239 cow = MAP_COPY_ON_WRITE | MAP_PREFAULT | 240 (prot & VM_PROT_WRITE ? 0 : MAP_DISABLE_COREDUMP); 241 242 count = vm_map_entry_reserve(MAP_RESERVE_COUNT); 243 vm_map_lock(&vmspace->vm_map); 244 rv = vm_map_insert(&vmspace->vm_map, &count, 245 object, 246 file_addr, /* file offset */ 247 map_addr, /* virtual start */ 248 map_addr + map_len,/* virtual end */ 249 prot, 250 VM_PROT_ALL, 251 cow); 252 vm_map_unlock(&vmspace->vm_map); 253 vm_map_entry_release(count); 254 if (rv != KERN_SUCCESS) { 255 vm_object_deallocate(object); 256 return EINVAL; 257 } 258 259 /* we can stop now if we've covered it all */ 260 if (memsz == filsz) { 261 return 0; 262 } 263 } 264 265 266 /* 267 * We have to get the remaining bit of the file into the first part 268 * of the oversized map segment. This is normally because the .data 269 * segment in the file is extended to provide bss. It's a neat idea 270 * to try and save a page, but it's a pain in the behind to implement. 271 */ 272 copy_len = (offset + filsz) - trunc_page(offset + filsz); 273 map_addr = trunc_page((vm_offset_t)vmaddr + filsz); 274 map_len = round_page((vm_offset_t)vmaddr + memsz) - map_addr; 275 276 /* This had damn well better be true! */ 277 if (map_len != 0) { 278 count = vm_map_entry_reserve(MAP_RESERVE_COUNT); 279 vm_map_lock(&vmspace->vm_map); 280 rv = vm_map_insert(&vmspace->vm_map, &count, 281 NULL, 0, 282 map_addr, map_addr + map_len, 283 VM_PROT_ALL, VM_PROT_ALL, 0); 284 vm_map_unlock(&vmspace->vm_map); 285 vm_map_entry_release(count); 286 if (rv != KERN_SUCCESS) { 287 return EINVAL; 288 } 289 } 290 291 if (copy_len != 0) { 292 vm_object_reference(object); 293 rv = vm_map_find(exec_map, 294 object, 295 trunc_page(offset + filsz), 296 &data_buf, 297 PAGE_SIZE, 298 TRUE, 299 VM_PROT_READ, 300 VM_PROT_ALL, 301 MAP_COPY_ON_WRITE | MAP_PREFAULT_PARTIAL); 302 if (rv != KERN_SUCCESS) { 303 vm_object_deallocate(object); 304 return EINVAL; 305 } 306 307 /* send the page fragment to user space */ 308 error = copyout((caddr_t)data_buf, (caddr_t)map_addr, copy_len); 309 vm_map_remove(exec_map, data_buf, data_buf + PAGE_SIZE); 310 if (error) { 311 return (error); 312 } 313 } 314 315 /* 316 * set it to the specified protection 317 */ 318 vm_map_protect(&vmspace->vm_map, map_addr, map_addr + map_len, prot, 319 FALSE); 320 321 return error; 322 } 323 324 /* 325 * Load the file "file" into memory. It may be either a shared object 326 * or an executable. 327 * 328 * The "addr" reference parameter is in/out. On entry, it specifies 329 * the address where a shared object should be loaded. If the file is 330 * an executable, this value is ignored. On exit, "addr" specifies 331 * where the file was actually loaded. 332 * 333 * The "entry" reference parameter is out only. On exit, it specifies 334 * the entry point for the loaded file. 335 */ 336 static int 337 elf_load_file(struct proc *p, const char *file, u_long *addr, u_long *entry) 338 { 339 struct { 340 struct nlookupdata nd; 341 struct vattr attr; 342 struct image_params image_params; 343 } *tempdata; 344 const Elf_Ehdr *hdr = NULL; 345 const Elf_Phdr *phdr = NULL; 346 struct nlookupdata *nd; 347 struct vmspace *vmspace = p->p_vmspace; 348 struct vattr *attr; 349 struct image_params *imgp; 350 vm_prot_t prot; 351 u_long rbase; 352 u_long base_addr = 0; 353 int error, i, numsegs; 354 struct thread *td = p->p_thread; 355 356 tempdata = malloc(sizeof(*tempdata), M_TEMP, M_WAITOK); 357 nd = &tempdata->nd; 358 attr = &tempdata->attr; 359 imgp = &tempdata->image_params; 360 361 /* 362 * Initialize part of the common data 363 */ 364 imgp->proc = p; 365 imgp->attr = attr; 366 imgp->firstpage = NULL; 367 imgp->image_header = NULL; 368 imgp->vp = NULL; 369 370 error = nlookup_init(nd, file, UIO_SYSSPACE, NLC_FOLLOW); 371 if (error == 0) 372 error = nlookup(nd); 373 if (error == 0) 374 error = cache_vget(nd->nl_ncp, nd->nl_cred, LK_EXCLUSIVE, &imgp->vp); 375 nlookup_done(nd); 376 if (error) 377 goto fail; 378 379 /* 380 * Check permissions, modes, uid, etc on the file, and "open" it. 381 */ 382 error = exec_check_permissions(imgp); 383 if (error) { 384 VOP_UNLOCK(imgp->vp, 0, td); 385 goto fail; 386 } 387 388 error = exec_map_first_page(imgp); 389 /* 390 * Also make certain that the interpreter stays the same, so set 391 * its VTEXT flag, too. 392 */ 393 if (error == 0) 394 imgp->vp->v_flag |= VTEXT; 395 VOP_UNLOCK(imgp->vp, 0, td); 396 if (error) 397 goto fail; 398 399 hdr = (const Elf_Ehdr *)imgp->image_header; 400 if ((error = elf_check_header(hdr)) != 0) 401 goto fail; 402 if (hdr->e_type == ET_DYN) 403 rbase = *addr; 404 else if (hdr->e_type == ET_EXEC) 405 rbase = 0; 406 else { 407 error = ENOEXEC; 408 goto fail; 409 } 410 411 /* Only support headers that fit within first page for now 412 * (multiplication of two Elf_Half fields will not overflow) */ 413 if ((hdr->e_phoff > PAGE_SIZE) || 414 (hdr->e_phentsize * hdr->e_phnum) > PAGE_SIZE - hdr->e_phoff) { 415 error = ENOEXEC; 416 goto fail; 417 } 418 419 phdr = (const Elf_Phdr *)(imgp->image_header + hdr->e_phoff); 420 421 for (i = 0, numsegs = 0; i < hdr->e_phnum; i++) { 422 if (phdr[i].p_type == PT_LOAD) { /* Loadable segment */ 423 prot = 0; 424 if (phdr[i].p_flags & PF_X) 425 prot |= VM_PROT_EXECUTE; 426 if (phdr[i].p_flags & PF_W) 427 prot |= VM_PROT_WRITE; 428 if (phdr[i].p_flags & PF_R) 429 prot |= VM_PROT_READ; 430 431 error = elf_load_section( 432 p, vmspace, imgp->vp, 433 phdr[i].p_offset, 434 (caddr_t)phdr[i].p_vaddr + 435 rbase, 436 phdr[i].p_memsz, 437 phdr[i].p_filesz, prot); 438 if (error != 0) 439 goto fail; 440 /* 441 * Establish the base address if this is the 442 * first segment. 443 */ 444 if (numsegs == 0) 445 base_addr = trunc_page(phdr[i].p_vaddr + rbase); 446 numsegs++; 447 } 448 } 449 *addr = base_addr; 450 *entry=(unsigned long)hdr->e_entry + rbase; 451 452 fail: 453 if (imgp->firstpage) 454 exec_unmap_first_page(imgp); 455 if (imgp->vp) { 456 vrele(imgp->vp); 457 imgp->vp = NULL; 458 } 459 free(tempdata, M_TEMP); 460 461 return error; 462 } 463 464 /* 465 * non static, as it can be overridden by start_init() 466 */ 467 int fallback_elf_brand = -1; 468 SYSCTL_INT(_kern, OID_AUTO, fallback_elf_brand, CTLFLAG_RW, 469 &fallback_elf_brand, -1, 470 "ELF brand of last resort"); 471 472 static int 473 exec_elf_imgact(struct image_params *imgp) 474 { 475 const Elf_Ehdr *hdr = (const Elf_Ehdr *) imgp->image_header; 476 const Elf_Phdr *phdr; 477 Elf_Auxargs *elf_auxargs = NULL; 478 struct vmspace *vmspace; 479 vm_prot_t prot; 480 u_long text_size = 0, data_size = 0, total_size = 0; 481 u_long text_addr = 0, data_addr = 0; 482 u_long seg_size, seg_addr; 483 u_long addr, entry = 0, proghdr = 0; 484 int error, i; 485 const char *interp = NULL; 486 Elf_Brandinfo *brand_info; 487 char *path; 488 489 error = 0; 490 491 /* 492 * Do we have a valid ELF header ? 493 */ 494 if (elf_check_header(hdr) != 0 || hdr->e_type != ET_EXEC) 495 return -1; 496 497 /* 498 * From here on down, we return an errno, not -1, as we've 499 * detected an ELF file. 500 */ 501 502 if ((hdr->e_phoff > PAGE_SIZE) || 503 (hdr->e_phoff + hdr->e_phentsize * hdr->e_phnum) > PAGE_SIZE) { 504 /* Only support headers in first page for now */ 505 return ENOEXEC; 506 } 507 phdr = (const Elf_Phdr*)(imgp->image_header + hdr->e_phoff); 508 509 /* 510 * From this point on, we may have resources that need to be freed. 511 */ 512 513 exec_new_vmspace(imgp, NULL); 514 515 /* 516 * Yeah, I'm paranoid. There is every reason in the world to get 517 * VTEXT now since from here on out, there are places we can have 518 * a context switch. Better safe than sorry; I really don't want 519 * the file to change while it's being loaded. 520 */ 521 vsetflags(imgp->vp, VTEXT); 522 523 vmspace = imgp->proc->p_vmspace; 524 525 for (i = 0; i < hdr->e_phnum; i++) { 526 switch(phdr[i].p_type) { 527 528 case PT_LOAD: /* Loadable segment */ 529 prot = 0; 530 if (phdr[i].p_flags & PF_X) 531 prot |= VM_PROT_EXECUTE; 532 if (phdr[i].p_flags & PF_W) 533 prot |= VM_PROT_WRITE; 534 if (phdr[i].p_flags & PF_R) 535 prot |= VM_PROT_READ; 536 537 if ((error = elf_load_section(imgp->proc, 538 vmspace, imgp->vp, 539 phdr[i].p_offset, 540 (caddr_t)phdr[i].p_vaddr, 541 phdr[i].p_memsz, 542 phdr[i].p_filesz, prot)) != 0) 543 goto fail; 544 545 /* 546 * If this segment contains the program headers, 547 * remember their virtual address for the AT_PHDR 548 * aux entry. Static binaries don't usually include 549 * a PT_PHDR entry. 550 */ 551 if (phdr[i].p_offset == 0 && 552 hdr->e_phoff + hdr->e_phnum * hdr->e_phentsize 553 <= phdr[i].p_filesz) 554 proghdr = phdr[i].p_vaddr + hdr->e_phoff; 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->args->argc + imgp->args->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->args->argc); 749 return 0; 750 } 751 752 /* 753 * Code for generating ELF core dumps. 754 */ 755 756 typedef int (*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 (incremented) */ 761 Elf_Phdr *phdr_max; /* Pointer bound for error check */ 762 Elf_Off offset; /* Offset of segment in core file */ 763 }; 764 765 /* Closure for cb_size_segment(). */ 766 struct sseg_closure { 767 int count; /* Count of writable segments. */ 768 size_t vsize; /* Total size of all writable segments. */ 769 }; 770 771 /* Closure for cb_put_fp(). */ 772 struct fp_closure { 773 struct vn_hdr *vnh; 774 struct vn_hdr *vnh_max; 775 int count; 776 struct stat *sb; 777 }; 778 779 typedef struct elf_buf { 780 char *buf; 781 size_t off; 782 size_t off_max; 783 } *elf_buf_t; 784 785 static void *target_reserve(elf_buf_t target, size_t bytes, int *error); 786 787 static int cb_put_phdr (vm_map_entry_t, void *); 788 static int cb_size_segment (vm_map_entry_t, void *); 789 static int cb_fpcount_segment(vm_map_entry_t, void *); 790 static int cb_put_fp(vm_map_entry_t, void *); 791 792 793 static int each_segment (struct proc *, segment_callback, void *, int); 794 static int elf_corehdr (struct proc *, struct file *, struct ucred *, 795 int, elf_buf_t); 796 static int elf_puthdr (struct proc *, elf_buf_t, const prstatus_t *, 797 const prfpregset_t *, const prpsinfo_t *, int); 798 static int elf_putnote (elf_buf_t, const char *, int, const void *, size_t); 799 800 static int elf_putsigs(struct proc *, elf_buf_t); 801 static int elf_puttextvp(struct proc *, elf_buf_t); 802 static int elf_putfiles(struct proc *, elf_buf_t); 803 804 extern int osreldate; 805 806 int 807 elf_coredump(struct proc *p, struct vnode *vp, off_t limit) 808 { 809 struct file *fp; 810 int error; 811 812 if ((error = falloc(NULL, &fp, NULL)) != 0) 813 return (error); 814 fsetcred(fp, p->p_ucred); 815 816 /* 817 * XXX fixme. 818 */ 819 fp->f_data = (caddr_t)vp; 820 fp->f_flag = O_CREAT|O_WRONLY|O_NOFOLLOW; 821 fp->f_ops = &vnode_fileops; 822 fp->f_type = DTYPE_VNODE; 823 VOP_UNLOCK(vp, 0, p->p_thread); 824 825 error = generic_elf_coredump(p, fp, limit); 826 827 fp->f_data = NULL; 828 fp->f_flag = 0; 829 fp->f_ops = &badfileops; 830 fp->f_type = 0; 831 fdrop(fp, p->p_thread); 832 return (error); 833 } 834 835 int 836 generic_elf_coredump(struct proc *p, struct file *fp, off_t limit) 837 { 838 struct ucred *cred = p->p_ucred; 839 int error = 0; 840 struct sseg_closure seginfo; 841 struct elf_buf target; 842 843 if (!fp) 844 printf("can't dump core - null fp\n"); 845 846 /* 847 * Size the program segments 848 */ 849 seginfo.count = 0; 850 seginfo.vsize = 0; 851 each_segment(p, cb_size_segment, &seginfo, 1); 852 853 /* 854 * Calculate the size of the core file header area by making 855 * a dry run of generating it. Nothing is written, but the 856 * size is calculated. 857 */ 858 bzero(&target, sizeof(target)); 859 elf_puthdr(p, &target, NULL, NULL, NULL, seginfo.count); 860 861 if (target.off + seginfo.vsize >= limit) 862 return (EFAULT); 863 864 /* 865 * Allocate memory for building the header, fill it up, 866 * and write it out. 867 */ 868 target.off_max = target.off; 869 target.off = 0; 870 target.buf = malloc(target.off_max, M_TEMP, M_WAITOK|M_ZERO); 871 872 if (target.buf == NULL) 873 return EINVAL; 874 error = elf_corehdr(p, fp, cred, seginfo.count, &target); 875 876 /* Write the contents of all of the writable segments. */ 877 if (error == 0) { 878 Elf_Phdr *php; 879 int i; 880 int nbytes; 881 882 php = (Elf_Phdr *)(target.buf + sizeof(Elf_Ehdr)) + 1; 883 for (i = 0; i < seginfo.count; i++) { 884 error = fp_write(fp, (caddr_t)php->p_vaddr, 885 php->p_filesz, &nbytes); 886 if (error != 0) 887 break; 888 php++; 889 } 890 } 891 free(target.buf, M_TEMP); 892 893 return error; 894 } 895 896 /* 897 * A callback for each_segment() to write out the segment's 898 * program header entry. 899 */ 900 static int 901 cb_put_phdr(vm_map_entry_t entry, void *closure) 902 { 903 struct phdr_closure *phc = closure; 904 Elf_Phdr *phdr = phc->phdr; 905 906 if (phc->phdr == phc->phdr_max) 907 return EINVAL; 908 909 phc->offset = round_page(phc->offset); 910 911 phdr->p_type = PT_LOAD; 912 phdr->p_offset = phc->offset; 913 phdr->p_vaddr = entry->start; 914 phdr->p_paddr = 0; 915 phdr->p_filesz = phdr->p_memsz = entry->end - entry->start; 916 phdr->p_align = PAGE_SIZE; 917 phdr->p_flags = 0; 918 if (entry->protection & VM_PROT_READ) 919 phdr->p_flags |= PF_R; 920 if (entry->protection & VM_PROT_WRITE) 921 phdr->p_flags |= PF_W; 922 if (entry->protection & VM_PROT_EXECUTE) 923 phdr->p_flags |= PF_X; 924 925 phc->offset += phdr->p_filesz; 926 ++phc->phdr; 927 return 0; 928 } 929 930 /* 931 * A callback for each_writable_segment() to gather information about 932 * the number of segments and their total size. 933 */ 934 static int 935 cb_size_segment(vm_map_entry_t entry, void *closure) 936 { 937 struct sseg_closure *ssc = closure; 938 939 ++ssc->count; 940 ssc->vsize += entry->end - entry->start; 941 return 0; 942 } 943 944 /* 945 * A callback for each_segment() to gather information about 946 * the number of text segments. 947 */ 948 static int 949 cb_fpcount_segment(vm_map_entry_t entry, void *closure) 950 { 951 int *count = closure; 952 struct vnode *vp; 953 954 if (entry->object.vm_object->type == OBJT_VNODE) { 955 vp = (struct vnode *)entry->object.vm_object->handle; 956 if ((vp->v_flag & VCKPT) && curproc->p_textvp == vp) 957 return 0; 958 ++*count; 959 } 960 return 0; 961 } 962 963 static int 964 cb_put_fp(vm_map_entry_t entry, void *closure) 965 { 966 struct fp_closure *fpc = closure; 967 struct vn_hdr *vnh = fpc->vnh; 968 Elf_Phdr *phdr = &vnh->vnh_phdr; 969 struct vnode *vp; 970 int error; 971 972 /* 973 * If an entry represents a vnode then write out a file handle. 974 * 975 * If we are checkpointing a checkpoint-restored program we do 976 * NOT record the filehandle for the old checkpoint vnode (which 977 * is mapped all over the place). Instead we rely on the fact 978 * that a checkpoint-restored program does not mmap() the checkpt 979 * vnode NOCORE, so its contents will be written out to the 980 * new checkpoint file. This is necessary because the 'old' 981 * checkpoint file is typically destroyed when a new one is created 982 * and thus cannot be used to restore the new checkpoint. 983 * 984 * Theoretically we could create a chain of checkpoint files and 985 * operate the checkpointing operation kinda like an incremental 986 * checkpoint, but a checkpoint restore would then likely wind up 987 * referencing many prior checkpoint files and that is a bit over 988 * the top for the purpose of the checkpoint API. 989 */ 990 if (entry->object.vm_object->type == OBJT_VNODE) { 991 vp = (struct vnode *)entry->object.vm_object->handle; 992 if ((vp->v_flag & VCKPT) && curproc->p_textvp == vp) 993 return 0; 994 if (vnh == fpc->vnh_max) 995 return EINVAL; 996 997 if (vp->v_mount) 998 vnh->vnh_fh.fh_fsid = vp->v_mount->mnt_stat.f_fsid; 999 error = VFS_VPTOFH(vp, &vnh->vnh_fh.fh_fid); 1000 if (error) 1001 return error; 1002 1003 phdr->p_type = PT_LOAD; 1004 phdr->p_offset = 0; /* not written to core */ 1005 phdr->p_vaddr = entry->start; 1006 phdr->p_paddr = 0; 1007 phdr->p_filesz = phdr->p_memsz = entry->end - entry->start; 1008 phdr->p_align = PAGE_SIZE; 1009 phdr->p_flags = 0; 1010 if (entry->protection & VM_PROT_READ) 1011 phdr->p_flags |= PF_R; 1012 if (entry->protection & VM_PROT_WRITE) 1013 phdr->p_flags |= PF_W; 1014 if (entry->protection & VM_PROT_EXECUTE) 1015 phdr->p_flags |= PF_X; 1016 ++fpc->vnh; 1017 ++fpc->count; 1018 } 1019 return 0; 1020 } 1021 1022 /* 1023 * For each writable segment in the process's memory map, call the given 1024 * function with a pointer to the map entry and some arbitrary 1025 * caller-supplied data. 1026 */ 1027 static int 1028 each_segment(struct proc *p, segment_callback func, void *closure, int writable) 1029 { 1030 int error = 0; 1031 vm_map_t map = &p->p_vmspace->vm_map; 1032 vm_map_entry_t entry; 1033 1034 for (entry = map->header.next; error == 0 && entry != &map->header; 1035 entry = entry->next) { 1036 vm_object_t obj; 1037 1038 /* 1039 * Don't dump inaccessible mappings, deal with legacy 1040 * coredump mode. 1041 * 1042 * Note that read-only segments related to the elf binary 1043 * are marked MAP_ENTRY_NOCOREDUMP now so we no longer 1044 * need to arbitrarily ignore such segments. 1045 */ 1046 if (elf_legacy_coredump) { 1047 if (writable && (entry->protection & VM_PROT_RW) != VM_PROT_RW) 1048 continue; 1049 } else { 1050 if (writable && (entry->protection & VM_PROT_ALL) == 0) 1051 continue; 1052 } 1053 1054 /* 1055 * Dont include memory segment in the coredump if 1056 * MAP_NOCORE is set in mmap(2) or MADV_NOCORE in 1057 * madvise(2). Do not dump submaps (i.e. parts of the 1058 * kernel map). 1059 */ 1060 if (writable && entry->eflags & (MAP_ENTRY_NOCOREDUMP|MAP_ENTRY_IS_SUB_MAP)) 1061 continue; 1062 1063 if ((obj = entry->object.vm_object) == NULL) 1064 continue; 1065 1066 /* Find the deepest backing object. */ 1067 while (obj->backing_object != NULL) 1068 obj = obj->backing_object; 1069 1070 /* Ignore memory-mapped devices and such things. */ 1071 if (obj->type != OBJT_DEFAULT && 1072 obj->type != OBJT_SWAP && 1073 obj->type != OBJT_VNODE) 1074 continue; 1075 1076 error = (*func)(entry, closure); 1077 } 1078 return error; 1079 } 1080 1081 static 1082 void * 1083 target_reserve(elf_buf_t target, size_t bytes, int *error) 1084 { 1085 void *res = NULL; 1086 1087 if (target->buf) { 1088 if (target->off + bytes > target->off_max) 1089 *error = EINVAL; 1090 else 1091 res = target->buf + target->off; 1092 } 1093 target->off += bytes; 1094 return (res); 1095 } 1096 1097 /* 1098 * Write the core file header to the file, including padding up to 1099 * the page boundary. 1100 */ 1101 static int 1102 elf_corehdr(struct proc *p, struct file *fp, struct ucred *cred, int numsegs, 1103 elf_buf_t target) 1104 { 1105 struct { 1106 prstatus_t status; 1107 prfpregset_t fpregset; 1108 prpsinfo_t psinfo; 1109 } *tempdata; 1110 int error; 1111 prstatus_t *status; 1112 prfpregset_t *fpregset; 1113 prpsinfo_t *psinfo; 1114 int nbytes; 1115 tempdata = malloc(sizeof(*tempdata), M_TEMP, M_ZERO | M_WAITOK); 1116 status = &tempdata->status; 1117 fpregset = &tempdata->fpregset; 1118 psinfo = &tempdata->psinfo; 1119 1120 /* Gather the information for the header. */ 1121 status->pr_version = PRSTATUS_VERSION; 1122 status->pr_statussz = sizeof(prstatus_t); 1123 status->pr_gregsetsz = sizeof(gregset_t); 1124 status->pr_fpregsetsz = sizeof(fpregset_t); 1125 status->pr_osreldate = osreldate; 1126 status->pr_cursig = p->p_sig; 1127 status->pr_pid = p->p_pid; 1128 fill_regs(p, &status->pr_reg); 1129 1130 fill_fpregs(p, fpregset); 1131 1132 psinfo->pr_version = PRPSINFO_VERSION; 1133 psinfo->pr_psinfosz = sizeof(prpsinfo_t); 1134 strncpy(psinfo->pr_fname, p->p_comm, sizeof(psinfo->pr_fname) - 1); 1135 1136 /* XXX - We don't fill in the command line arguments properly yet. */ 1137 strncpy(psinfo->pr_psargs, p->p_comm, PRARGSZ); 1138 1139 /* Fill in the header. */ 1140 error = elf_puthdr(p, target, status, fpregset, psinfo, numsegs); 1141 1142 free(tempdata, M_TEMP); 1143 1144 /* Write it to the core file. */ 1145 if (error == 0) 1146 error = fp_write(fp, target->buf, target->off, &nbytes); 1147 return error; 1148 } 1149 1150 static int 1151 elf_puthdr(struct proc *p, elf_buf_t target, const prstatus_t *status, 1152 const prfpregset_t *fpregset, const prpsinfo_t *psinfo, int numsegs) 1153 { 1154 int error = 0; 1155 size_t phoff; 1156 size_t noteoff; 1157 size_t notesz; 1158 Elf_Ehdr *ehdr; 1159 Elf_Phdr *phdr; 1160 1161 ehdr = target_reserve(target, sizeof(Elf_Ehdr), &error); 1162 1163 phoff = target->off; 1164 phdr = target_reserve(target, (numsegs + 1) * sizeof(Elf_Phdr), &error); 1165 1166 noteoff = target->off; 1167 if (error == 0) { 1168 error = elf_putnote(target, "FreeBSD", NT_PRSTATUS, 1169 status, sizeof *status); 1170 } 1171 if (error == 0) { 1172 error = elf_putnote(target, "FreeBSD", NT_FPREGSET, 1173 fpregset, sizeof *fpregset); 1174 } 1175 if (error == 0) { 1176 error = elf_putnote(target, "FreeBSD", NT_PRPSINFO, 1177 psinfo, sizeof *psinfo); 1178 } 1179 notesz = target->off - noteoff; 1180 1181 /* 1182 * put extra cruft for dumping process state here 1183 * - we really want it be before all the program 1184 * mappings 1185 * - we just need to update the offset accordingly 1186 * and GDB will be none the wiser. 1187 */ 1188 if (error == 0) 1189 error = elf_puttextvp(p, target); 1190 if (error == 0) 1191 error = elf_putsigs(p, target); 1192 if (error == 0) 1193 error = elf_putfiles(p, target); 1194 1195 /* 1196 * Align up to a page boundary for the program segments. The 1197 * actual data will be written to the outptu file, not to elf_buf_t, 1198 * so we do not have to do any further bounds checking. 1199 */ 1200 target->off = round_page(target->off); 1201 if (error == 0 && ehdr != NULL) { 1202 /* 1203 * Fill in the ELF header. 1204 */ 1205 ehdr->e_ident[EI_MAG0] = ELFMAG0; 1206 ehdr->e_ident[EI_MAG1] = ELFMAG1; 1207 ehdr->e_ident[EI_MAG2] = ELFMAG2; 1208 ehdr->e_ident[EI_MAG3] = ELFMAG3; 1209 ehdr->e_ident[EI_CLASS] = ELF_CLASS; 1210 ehdr->e_ident[EI_DATA] = ELF_DATA; 1211 ehdr->e_ident[EI_VERSION] = EV_CURRENT; 1212 ehdr->e_ident[EI_OSABI] = ELFOSABI_FREEBSD; 1213 ehdr->e_ident[EI_ABIVERSION] = 0; 1214 ehdr->e_ident[EI_PAD] = 0; 1215 ehdr->e_type = ET_CORE; 1216 ehdr->e_machine = ELF_ARCH; 1217 ehdr->e_version = EV_CURRENT; 1218 ehdr->e_entry = 0; 1219 ehdr->e_phoff = phoff; 1220 ehdr->e_flags = 0; 1221 ehdr->e_ehsize = sizeof(Elf_Ehdr); 1222 ehdr->e_phentsize = sizeof(Elf_Phdr); 1223 ehdr->e_phnum = numsegs + 1; 1224 ehdr->e_shentsize = sizeof(Elf_Shdr); 1225 ehdr->e_shnum = 0; 1226 ehdr->e_shstrndx = SHN_UNDEF; 1227 } 1228 if (error == 0 && phdr != NULL) { 1229 /* 1230 * Fill in the program header entries. 1231 */ 1232 struct phdr_closure phc; 1233 1234 /* The note segement. */ 1235 phdr->p_type = PT_NOTE; 1236 phdr->p_offset = noteoff; 1237 phdr->p_vaddr = 0; 1238 phdr->p_paddr = 0; 1239 phdr->p_filesz = notesz; 1240 phdr->p_memsz = 0; 1241 phdr->p_flags = 0; 1242 phdr->p_align = 0; 1243 ++phdr; 1244 1245 /* All the writable segments from the program. */ 1246 phc.phdr = phdr; 1247 phc.phdr_max = phdr + numsegs; 1248 phc.offset = target->off; 1249 each_segment(p, cb_put_phdr, &phc, 1); 1250 } 1251 return (error); 1252 } 1253 1254 static int 1255 elf_putnote(elf_buf_t target, const char *name, int type, 1256 const void *desc, size_t descsz) 1257 { 1258 int error = 0; 1259 char *dst; 1260 Elf_Note note; 1261 1262 note.n_namesz = strlen(name) + 1; 1263 note.n_descsz = descsz; 1264 note.n_type = type; 1265 dst = target_reserve(target, sizeof(note), &error); 1266 if (dst != NULL) 1267 bcopy(¬e, dst, sizeof note); 1268 dst = target_reserve(target, note.n_namesz, &error); 1269 if (dst != NULL) 1270 bcopy(name, dst, note.n_namesz); 1271 target->off = roundup2(target->off, sizeof(Elf_Size)); 1272 dst = target_reserve(target, note.n_descsz, &error); 1273 if (dst != NULL) 1274 bcopy(desc, dst, note.n_descsz); 1275 target->off = roundup2(target->off, sizeof(Elf_Size)); 1276 return(error); 1277 } 1278 1279 1280 static int 1281 elf_putsigs(struct proc *p, elf_buf_t target) 1282 { 1283 int error = 0; 1284 struct ckpt_siginfo *csi; 1285 1286 csi = target_reserve(target, sizeof(struct ckpt_siginfo), &error); 1287 if (csi) { 1288 csi->csi_ckptpisz = sizeof(struct ckpt_siginfo); 1289 bcopy(p->p_procsig, &csi->csi_procsig, sizeof(struct procsig)); 1290 bcopy(p->p_procsig->ps_sigacts, &csi->csi_sigacts, sizeof(struct sigacts)); 1291 bcopy(&p->p_realtimer, &csi->csi_itimerval, sizeof(struct itimerval)); 1292 bcopy(&p->p_sigmask, &csi->csi_sigmask, sizeof(sigset_t)); 1293 csi->csi_sigparent = p->p_sigparent; 1294 } 1295 return(error); 1296 } 1297 1298 static int 1299 elf_putfiles(struct proc *p, elf_buf_t target) 1300 { 1301 int error = 0; 1302 int i; 1303 struct ckpt_filehdr *cfh = NULL; 1304 struct ckpt_fileinfo *cfi; 1305 struct file *fp; 1306 struct vnode *vp; 1307 /* 1308 * the duplicated loop is gross, but it was the only way 1309 * to eliminate uninitialized variable warnings 1310 */ 1311 cfh = target_reserve(target, sizeof(struct ckpt_filehdr), &error); 1312 if (cfh) { 1313 cfh->cfh_nfiles = 0; 1314 } 1315 1316 /* 1317 * ignore STDIN/STDERR/STDOUT. 1318 */ 1319 for (i = 3; error == 0 && i < p->p_fd->fd_nfiles; i++) { 1320 if ((fp = p->p_fd->fd_ofiles[i]) == NULL) 1321 continue; 1322 /* 1323 * XXX Only checkpoint vnodes for now. 1324 */ 1325 if (fp->f_type != DTYPE_VNODE) 1326 continue; 1327 cfi = target_reserve(target, sizeof(struct ckpt_fileinfo), 1328 &error); 1329 if (cfi == NULL) 1330 continue; 1331 cfi->cfi_index = -1; 1332 cfi->cfi_type = fp->f_type; 1333 cfi->cfi_flags = fp->f_flag; 1334 cfi->cfi_offset = fp->f_offset; 1335 /* f_count and f_msgcount should not be saved/restored */ 1336 /* XXX save cred info */ 1337 1338 switch(fp->f_type) { 1339 case DTYPE_VNODE: 1340 vp = (struct vnode *)fp->f_data; 1341 /* 1342 * it looks like a bug in ptrace is marking 1343 * a non-vnode as a vnode - until we find the 1344 * root cause this will at least prevent 1345 * further panics from truss 1346 */ 1347 if (vp == NULL || vp->v_mount == NULL) 1348 break; 1349 cfh->cfh_nfiles++; 1350 cfi->cfi_index = i; 1351 cfi->cfi_fh.fh_fsid = vp->v_mount->mnt_stat.f_fsid; 1352 error = VFS_VPTOFH(vp, &cfi->cfi_fh.fh_fid); 1353 break; 1354 default: 1355 break; 1356 } 1357 } 1358 return(error); 1359 } 1360 1361 static int 1362 elf_puttextvp(struct proc *p, elf_buf_t target) 1363 { 1364 int error = 0; 1365 int *vn_count; 1366 struct fp_closure fpc; 1367 struct ckpt_vminfo *vminfo; 1368 1369 vminfo = target_reserve(target, sizeof(struct ckpt_vminfo), &error); 1370 if (vminfo != NULL) { 1371 vminfo->cvm_dsize = p->p_vmspace->vm_dsize; 1372 vminfo->cvm_tsize = p->p_vmspace->vm_tsize; 1373 vminfo->cvm_daddr = p->p_vmspace->vm_daddr; 1374 vminfo->cvm_taddr = p->p_vmspace->vm_taddr; 1375 } 1376 1377 fpc.count = 0; 1378 vn_count = target_reserve(target, sizeof(int), &error); 1379 if (target->buf != NULL) { 1380 fpc.vnh = (struct vn_hdr *)(target->buf + target->off); 1381 fpc.vnh_max = fpc.vnh + 1382 (target->off_max - target->off) / sizeof(struct vn_hdr); 1383 error = each_segment(p, cb_put_fp, &fpc, 0); 1384 if (vn_count) 1385 *vn_count = fpc.count; 1386 } else { 1387 error = each_segment(p, cb_fpcount_segment, &fpc.count, 0); 1388 } 1389 target->off += fpc.count * sizeof(struct vn_hdr); 1390 return(error); 1391 } 1392 1393 1394 /* 1395 * Tell kern_execve.c about it, with a little help from the linker. 1396 */ 1397 static struct execsw elf_execsw = {exec_elf_imgact, "ELF"}; 1398 EXEC_SET_ORDERED(elf, elf_execsw, SI_ORDER_FIRST); 1399