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 without 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 1.55 2008/08/17 17:21:36 nth 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 #include <sys/eventhandler.h> 55 56 #include <cpu/lwbuf.h> 57 58 #include <vm/vm.h> 59 #include <vm/vm_kern.h> 60 #include <vm/vm_param.h> 61 #include <vm/pmap.h> 62 #include <sys/lock.h> 63 #include <vm/vm_map.h> 64 #include <vm/vm_object.h> 65 #include <vm/vm_extern.h> 66 67 #include <machine/elf.h> 68 #include <machine/md_var.h> 69 #include <sys/mount.h> 70 #include <sys/ckpt.h> 71 #define OLD_EI_BRAND 8 72 73 __ElfType(Brandinfo); 74 __ElfType(Auxargs); 75 76 static int elf_check_header (const Elf_Ehdr *hdr); 77 static int elf_freebsd_fixup (register_t **stack_base, 78 struct image_params *imgp); 79 static int elf_load_file (struct proc *p, const char *file, u_long *addr, 80 u_long *entry); 81 static int elf_load_section (struct proc *p, 82 struct vmspace *vmspace, struct vnode *vp, 83 vm_offset_t offset, caddr_t vmaddr, size_t memsz, size_t filsz, 84 vm_prot_t prot); 85 static int exec_elf_imgact (struct image_params *imgp); 86 87 static int elf_trace = 0; 88 SYSCTL_INT(_debug, OID_AUTO, elf_trace, CTLFLAG_RW, &elf_trace, 0, ""); 89 static int elf_legacy_coredump = 0; 90 SYSCTL_INT(_debug, OID_AUTO, elf_legacy_coredump, CTLFLAG_RW, 91 &elf_legacy_coredump, 0, 92 "Do not dump inaccessible mappings, legacy coredump mode"); 93 94 static int dragonfly_match_abi_note(const Elf_Note *); 95 static int freebsd_match_abi_note(const Elf_Note *); 96 97 static struct sysentvec elf_freebsd_sysvec = { 98 SYS_MAXSYSCALL, 99 sysent, 100 -1, 101 0, 102 0, 103 0, 104 0, 105 0, 106 elf_freebsd_fixup, 107 sendsig, 108 sigcode, 109 &szsigcode, 110 0, 111 #if defined(__x86_64__) 112 "FreeBSD ELF64", 113 #else 114 "FreeBSD ELF32", 115 #endif 116 elf_coredump, 117 NULL, 118 MINSIGSTKSZ 119 }; 120 121 static Elf_Brandinfo freebsd_brand_info = { 122 ELFOSABI_FREEBSD, 123 "FreeBSD", 124 freebsd_match_abi_note, 125 "", 126 "/usr/libexec/ld-elf.so.1", 127 &elf_freebsd_sysvec 128 }; 129 130 static Elf_Brandinfo dragonfly_brand_info = { 131 ELFOSABI_NONE, 132 "DragonFly", 133 dragonfly_match_abi_note, 134 "", 135 "/usr/libexec/ld-elf.so.2", 136 &elf_freebsd_sysvec 137 }; 138 139 static Elf_Brandinfo *elf_brand_list[MAX_BRANDS] = { 140 &dragonfly_brand_info, 141 &freebsd_brand_info, 142 NULL, NULL, NULL, 143 NULL, NULL, NULL 144 }; 145 146 static int 147 freebsd_match_abi_note(const Elf_Note *abi_note) 148 { 149 const char *abi_name = (const char *) 150 ((const uint8_t *)abi_note + sizeof(*abi_note)); 151 152 if (abi_note->n_namesz != sizeof("FreeBSD")) 153 return(FALSE); 154 if (memcmp(abi_name, "FreeBSD", sizeof("FreeBSD"))) 155 return(FALSE); 156 return(TRUE); 157 } 158 159 static int 160 dragonfly_match_abi_note(const Elf_Note *abi_note) 161 { 162 const char *abi_name = (const char *) 163 ((const uint8_t *)abi_note + sizeof(*abi_note)); 164 165 if (abi_note->n_namesz != sizeof("DragonFly")) 166 return(FALSE); 167 if (memcmp(abi_name, "DragonFly", sizeof("DragonFly"))) 168 return(FALSE); 169 return(TRUE); 170 } 171 172 int 173 elf_insert_brand_entry(Elf_Brandinfo *entry) 174 { 175 int i; 176 177 for (i=1; i<MAX_BRANDS; i++) { 178 if (elf_brand_list[i] == NULL) { 179 elf_brand_list[i] = entry; 180 break; 181 } 182 } 183 if (i == MAX_BRANDS) 184 return -1; 185 return 0; 186 } 187 188 int 189 elf_remove_brand_entry(Elf_Brandinfo *entry) 190 { 191 int i; 192 193 for (i=1; i<MAX_BRANDS; i++) { 194 if (elf_brand_list[i] == entry) { 195 elf_brand_list[i] = NULL; 196 break; 197 } 198 } 199 if (i == MAX_BRANDS) 200 return -1; 201 return 0; 202 } 203 204 /* 205 * Check if an elf brand is being used anywhere in the system. 206 * 207 * Used by the linux emulation module unloader. This isn't safe from 208 * races. 209 */ 210 struct elf_brand_inuse_info { 211 int rval; 212 Elf_Brandinfo *entry; 213 }; 214 215 static int elf_brand_inuse_callback(struct proc *p, void *data); 216 217 int 218 elf_brand_inuse(Elf_Brandinfo *entry) 219 { 220 struct elf_brand_inuse_info info; 221 222 info.rval = FALSE; 223 info.entry = entry; 224 allproc_scan(elf_brand_inuse_callback, entry); 225 return (info.rval); 226 } 227 228 static 229 int 230 elf_brand_inuse_callback(struct proc *p, void *data) 231 { 232 struct elf_brand_inuse_info *info = data; 233 234 if (p->p_sysent == info->entry->sysvec) { 235 info->rval = TRUE; 236 return(-1); 237 } 238 return(0); 239 } 240 241 static int 242 elf_check_header(const Elf_Ehdr *hdr) 243 { 244 if (!IS_ELF(*hdr) || 245 hdr->e_ident[EI_CLASS] != ELF_TARG_CLASS || 246 hdr->e_ident[EI_DATA] != ELF_TARG_DATA || 247 hdr->e_ident[EI_VERSION] != EV_CURRENT || 248 hdr->e_phentsize != sizeof(Elf_Phdr) || 249 hdr->e_ehsize != sizeof(Elf_Ehdr) || 250 hdr->e_version != ELF_TARG_VER) 251 return ENOEXEC; 252 253 if (!ELF_MACHINE_OK(hdr->e_machine)) 254 return ENOEXEC; 255 256 return 0; 257 } 258 259 static Elf_Brandinfo * 260 elf_check_abi_note(struct image_params *imgp, const Elf_Phdr *ph) 261 { 262 Elf_Brandinfo *match = NULL; 263 const Elf_Note *tmp_note; 264 struct lwbuf *lwb; 265 const char *page; 266 char *data = NULL; 267 Elf_Off off; 268 size_t firstoff; 269 size_t len; 270 size_t firstlen; 271 272 len = ph->p_filesz; 273 off = ph->p_offset; 274 275 firstoff = off & PAGE_MASK; 276 firstlen = PAGE_SIZE - firstoff; 277 278 if (len < sizeof(Elf_Note) || len > PAGE_SIZE) 279 return NULL; /* ENOEXEC? */ 280 281 if (exec_map_page(imgp, off >> PAGE_SHIFT, &lwb, &page)) 282 return NULL; 283 284 /* 285 * Crosses page boundary? Is that allowed? 286 */ 287 if (firstlen < len) { 288 data = kmalloc(len, M_TEMP, M_WAITOK); 289 290 bcopy(page + firstoff, data, firstlen); 291 292 exec_unmap_page(lwb); 293 if (exec_map_page(imgp, (off >> PAGE_SHIFT) + 1, &lwb, &page)) { 294 kfree(data, M_TEMP); 295 return NULL; 296 } 297 bcopy(page, data + firstlen, len - firstlen); 298 tmp_note = (void *)data; 299 } else { 300 tmp_note = (const void *)(page + firstoff); 301 } 302 303 while (len >= sizeof(Elf_Note)) { 304 int i; 305 size_t nlen = roundup(tmp_note->n_namesz, sizeof(Elf_Word)) + 306 roundup(tmp_note->n_descsz, sizeof(Elf_Word)) + 307 sizeof(Elf_Note); 308 309 if (nlen > len) 310 break; 311 312 if (tmp_note->n_type != 1) 313 goto next; 314 315 for (i = 0; i < MAX_BRANDS; i++) { 316 Elf_Brandinfo *bi = elf_brand_list[i]; 317 318 if (bi != NULL && bi->match_abi_note != NULL && 319 bi->match_abi_note(tmp_note)) { 320 match = bi; 321 break; 322 } 323 } 324 325 if (match != NULL) 326 break; 327 328 next: 329 len -= nlen; 330 tmp_note += nlen; 331 } 332 333 if (data != NULL) 334 kfree(data, M_TEMP); 335 exec_unmap_page(lwb); 336 337 return (match); 338 } 339 340 static int 341 elf_load_section(struct proc *p, struct vmspace *vmspace, struct vnode *vp, 342 vm_offset_t offset, caddr_t vmaddr, size_t memsz, 343 size_t filsz, vm_prot_t prot) 344 { 345 size_t map_len; 346 vm_offset_t map_addr; 347 int error, rv, cow; 348 int count; 349 size_t copy_len; 350 vm_object_t object; 351 vm_offset_t file_addr; 352 353 object = vp->v_object; 354 error = 0; 355 356 /* 357 * It's necessary to fail if the filsz + offset taken from the 358 * header is greater than the actual file pager object's size. 359 * If we were to allow this, then the vm_map_find() below would 360 * walk right off the end of the file object and into the ether. 361 * 362 * While I'm here, might as well check for something else that 363 * is invalid: filsz cannot be greater than memsz. 364 */ 365 if ((off_t)filsz + offset > vp->v_filesize || filsz > memsz) { 366 uprintf("elf_load_section: truncated ELF file\n"); 367 return (ENOEXEC); 368 } 369 370 map_addr = trunc_page((vm_offset_t)vmaddr); 371 file_addr = trunc_page(offset); 372 373 /* 374 * We have two choices. We can either clear the data in the last page 375 * of an oversized mapping, or we can start the anon mapping a page 376 * early and copy the initialized data into that first page. We 377 * choose the second.. 378 */ 379 if (memsz > filsz) 380 map_len = trunc_page(offset+filsz) - file_addr; 381 else 382 map_len = round_page(offset+filsz) - file_addr; 383 384 if (map_len != 0) { 385 vm_object_reference(object); 386 387 /* cow flags: don't dump readonly sections in core */ 388 cow = MAP_COPY_ON_WRITE | MAP_PREFAULT | 389 (prot & VM_PROT_WRITE ? 0 : MAP_DISABLE_COREDUMP); 390 391 count = vm_map_entry_reserve(MAP_RESERVE_COUNT); 392 vm_map_lock(&vmspace->vm_map); 393 rv = vm_map_insert(&vmspace->vm_map, &count, 394 object, 395 file_addr, /* file offset */ 396 map_addr, /* virtual start */ 397 map_addr + map_len,/* virtual end */ 398 VM_MAPTYPE_NORMAL, 399 prot, VM_PROT_ALL, 400 cow); 401 vm_map_unlock(&vmspace->vm_map); 402 vm_map_entry_release(count); 403 if (rv != KERN_SUCCESS) { 404 vm_object_deallocate(object); 405 return EINVAL; 406 } 407 408 /* we can stop now if we've covered it all */ 409 if (memsz == filsz) { 410 return 0; 411 } 412 } 413 414 415 /* 416 * We have to get the remaining bit of the file into the first part 417 * of the oversized map segment. This is normally because the .data 418 * segment in the file is extended to provide bss. It's a neat idea 419 * to try and save a page, but it's a pain in the behind to implement. 420 */ 421 copy_len = (offset + filsz) - trunc_page(offset + filsz); 422 map_addr = trunc_page((vm_offset_t)vmaddr + filsz); 423 map_len = round_page((vm_offset_t)vmaddr + memsz) - map_addr; 424 425 /* This had damn well better be true! */ 426 if (map_len != 0) { 427 count = vm_map_entry_reserve(MAP_RESERVE_COUNT); 428 vm_map_lock(&vmspace->vm_map); 429 rv = vm_map_insert(&vmspace->vm_map, &count, 430 NULL, 0, 431 map_addr, map_addr + map_len, 432 VM_MAPTYPE_NORMAL, 433 VM_PROT_ALL, VM_PROT_ALL, 434 0); 435 vm_map_unlock(&vmspace->vm_map); 436 vm_map_entry_release(count); 437 if (rv != KERN_SUCCESS) { 438 return EINVAL; 439 } 440 } 441 442 if (copy_len != 0) { 443 vm_page_t m; 444 struct lwbuf *lwb; 445 446 m = vm_fault_object_page(object, trunc_page(offset + filsz), 447 VM_PROT_READ, 0, &error); 448 if (m) { 449 lwb = lwbuf_alloc(m); 450 error = copyout((caddr_t)lwbuf_kva(lwb), 451 (caddr_t)map_addr, copy_len); 452 lwbuf_free(lwb); 453 vm_page_unhold(m); 454 } 455 if (error) { 456 return (error); 457 } 458 } 459 460 /* 461 * set it to the specified protection 462 */ 463 vm_map_protect(&vmspace->vm_map, map_addr, map_addr + map_len, prot, 464 FALSE); 465 466 return error; 467 } 468 469 /* 470 * Load the file "file" into memory. It may be either a shared object 471 * or an executable. 472 * 473 * The "addr" reference parameter is in/out. On entry, it specifies 474 * the address where a shared object should be loaded. If the file is 475 * an executable, this value is ignored. On exit, "addr" specifies 476 * where the file was actually loaded. 477 * 478 * The "entry" reference parameter is out only. On exit, it specifies 479 * the entry point for the loaded file. 480 */ 481 static int 482 elf_load_file(struct proc *p, const char *file, u_long *addr, u_long *entry) 483 { 484 struct { 485 struct nlookupdata nd; 486 struct vattr attr; 487 struct image_params image_params; 488 } *tempdata; 489 const Elf_Ehdr *hdr = NULL; 490 const Elf_Phdr *phdr = NULL; 491 struct nlookupdata *nd; 492 struct vmspace *vmspace = p->p_vmspace; 493 struct vattr *attr; 494 struct image_params *imgp; 495 struct mount *topmnt; 496 vm_prot_t prot; 497 u_long rbase; 498 u_long base_addr = 0; 499 int error, i, numsegs; 500 501 tempdata = kmalloc(sizeof(*tempdata), M_TEMP, M_WAITOK); 502 nd = &tempdata->nd; 503 attr = &tempdata->attr; 504 imgp = &tempdata->image_params; 505 506 /* 507 * Initialize part of the common data 508 */ 509 imgp->proc = p; 510 imgp->attr = attr; 511 imgp->firstpage = NULL; 512 imgp->image_header = NULL; 513 imgp->vp = NULL; 514 515 error = nlookup_init(nd, file, UIO_SYSSPACE, NLC_FOLLOW); 516 if (error == 0) 517 error = nlookup(nd); 518 if (error == 0) 519 error = cache_vget(&nd->nl_nch, nd->nl_cred, LK_EXCLUSIVE, &imgp->vp); 520 topmnt = nd->nl_nch.mount; 521 nlookup_done(nd); 522 if (error) 523 goto fail; 524 525 /* 526 * Check permissions, modes, uid, etc on the file, and "open" it. 527 */ 528 error = exec_check_permissions(imgp, topmnt); 529 if (error) { 530 vn_unlock(imgp->vp); 531 goto fail; 532 } 533 534 error = exec_map_first_page(imgp); 535 /* 536 * Also make certain that the interpreter stays the same, so set 537 * its VTEXT flag, too. 538 */ 539 if (error == 0) 540 vsetflags(imgp->vp, VTEXT); 541 vn_unlock(imgp->vp); 542 if (error) 543 goto fail; 544 545 hdr = (const Elf_Ehdr *)imgp->image_header; 546 if ((error = elf_check_header(hdr)) != 0) 547 goto fail; 548 if (hdr->e_type == ET_DYN) 549 rbase = *addr; 550 else if (hdr->e_type == ET_EXEC) 551 rbase = 0; 552 else { 553 error = ENOEXEC; 554 goto fail; 555 } 556 557 /* Only support headers that fit within first page for now 558 * (multiplication of two Elf_Half fields will not overflow) */ 559 if ((hdr->e_phoff > PAGE_SIZE) || 560 (hdr->e_phentsize * hdr->e_phnum) > PAGE_SIZE - hdr->e_phoff) { 561 error = ENOEXEC; 562 goto fail; 563 } 564 565 phdr = (const Elf_Phdr *)(imgp->image_header + hdr->e_phoff); 566 567 for (i = 0, numsegs = 0; i < hdr->e_phnum; i++) { 568 if (phdr[i].p_type == PT_LOAD) { /* Loadable segment */ 569 prot = 0; 570 if (phdr[i].p_flags & PF_X) 571 prot |= VM_PROT_EXECUTE; 572 if (phdr[i].p_flags & PF_W) 573 prot |= VM_PROT_WRITE; 574 if (phdr[i].p_flags & PF_R) 575 prot |= VM_PROT_READ; 576 577 error = elf_load_section( 578 p, vmspace, imgp->vp, 579 phdr[i].p_offset, 580 (caddr_t)phdr[i].p_vaddr + 581 rbase, 582 phdr[i].p_memsz, 583 phdr[i].p_filesz, prot); 584 if (error != 0) 585 goto fail; 586 /* 587 * Establish the base address if this is the 588 * first segment. 589 */ 590 if (numsegs == 0) 591 base_addr = trunc_page(phdr[i].p_vaddr + rbase); 592 numsegs++; 593 } 594 } 595 *addr = base_addr; 596 *entry=(unsigned long)hdr->e_entry + rbase; 597 598 fail: 599 if (imgp->firstpage) 600 exec_unmap_first_page(imgp); 601 if (imgp->vp) { 602 vrele(imgp->vp); 603 imgp->vp = NULL; 604 } 605 kfree(tempdata, M_TEMP); 606 607 return error; 608 } 609 610 /* 611 * non static, as it can be overridden by start_init() 612 */ 613 int fallback_elf_brand = -1; 614 SYSCTL_INT(_kern, OID_AUTO, fallback_elf_brand, CTLFLAG_RW, 615 &fallback_elf_brand, -1, 616 "ELF brand of last resort"); 617 618 static int can_exec_dyn = 1; 619 SYSCTL_INT(_kern, OID_AUTO, elf_exec_dyn, CTLFLAG_RW, 620 &can_exec_dyn, 1, 621 "ELF: can exec shared libraries"); 622 623 static int 624 exec_elf_imgact(struct image_params *imgp) 625 { 626 const Elf_Ehdr *hdr = (const Elf_Ehdr *) imgp->image_header; 627 const Elf_Phdr *phdr; 628 Elf_Auxargs *elf_auxargs = NULL; 629 struct vmspace *vmspace; 630 vm_prot_t prot; 631 u_long text_size = 0, data_size = 0, total_size = 0; 632 u_long text_addr = 0, data_addr = 0; 633 u_long seg_size, seg_addr; 634 u_long addr, entry = 0, proghdr = 0; 635 int error, i; 636 const char *interp = NULL; 637 const Elf_Note *abi_note = NULL; 638 Elf_Brandinfo *brand_info = NULL; 639 char *path; 640 641 error = 0; 642 643 /* 644 * Do we have a valid ELF header ? 645 * We allow execution of ET_EXEC and, if kern.elf_exec_dyn is 1, ET_DYN. 646 */ 647 if (elf_check_header(hdr) != 0 || 648 (hdr->e_type != ET_EXEC && (!can_exec_dyn || hdr->e_type != ET_DYN))) 649 return -1; 650 651 /* 652 * From here on down, we return an errno, not -1, as we've 653 * detected an ELF file. 654 */ 655 656 if ((hdr->e_phoff > PAGE_SIZE) || 657 (hdr->e_phoff + hdr->e_phentsize * hdr->e_phnum) > PAGE_SIZE) { 658 /* Only support headers in first page for now */ 659 return ENOEXEC; 660 } 661 phdr = (const Elf_Phdr*)(imgp->image_header + hdr->e_phoff); 662 663 /* 664 * From this point on, we may have resources that need to be freed. 665 */ 666 667 exec_new_vmspace(imgp, NULL); 668 669 /* 670 * Yeah, I'm paranoid. There is every reason in the world to get 671 * VTEXT now since from here on out, there are places we can have 672 * a context switch. Better safe than sorry; I really don't want 673 * the file to change while it's being loaded. 674 */ 675 vsetflags(imgp->vp, VTEXT); 676 677 vmspace = imgp->proc->p_vmspace; 678 679 for (i = 0; i < hdr->e_phnum; i++) { 680 switch(phdr[i].p_type) { 681 682 case PT_LOAD: /* Loadable segment */ 683 prot = 0; 684 if (phdr[i].p_flags & PF_X) 685 prot |= VM_PROT_EXECUTE; 686 if (phdr[i].p_flags & PF_W) 687 prot |= VM_PROT_WRITE; 688 if (phdr[i].p_flags & PF_R) 689 prot |= VM_PROT_READ; 690 691 if ((error = elf_load_section(imgp->proc, 692 vmspace, imgp->vp, 693 phdr[i].p_offset, 694 (caddr_t)phdr[i].p_vaddr, 695 phdr[i].p_memsz, 696 phdr[i].p_filesz, prot)) != 0) 697 goto fail; 698 699 /* 700 * If this segment contains the program headers, 701 * remember their virtual address for the AT_PHDR 702 * aux entry. Static binaries don't usually include 703 * a PT_PHDR entry. 704 */ 705 if (phdr[i].p_offset == 0 && 706 hdr->e_phoff + hdr->e_phnum * hdr->e_phentsize 707 <= phdr[i].p_filesz) 708 proghdr = phdr[i].p_vaddr + hdr->e_phoff; 709 710 seg_addr = trunc_page(phdr[i].p_vaddr); 711 seg_size = round_page(phdr[i].p_memsz + 712 phdr[i].p_vaddr - seg_addr); 713 714 /* 715 * Is this .text or .data? We can't use 716 * VM_PROT_WRITE or VM_PROT_EXEC, it breaks the 717 * alpha terribly and possibly does other bad 718 * things so we stick to the old way of figuring 719 * it out: If the segment contains the program 720 * entry point, it's a text segment, otherwise it 721 * is a data segment. 722 * 723 * Note that obreak() assumes that data_addr + 724 * data_size == end of data load area, and the ELF 725 * file format expects segments to be sorted by 726 * address. If multiple data segments exist, the 727 * last one will be used. 728 */ 729 if (hdr->e_entry >= phdr[i].p_vaddr && 730 hdr->e_entry < (phdr[i].p_vaddr + 731 phdr[i].p_memsz)) { 732 text_size = seg_size; 733 text_addr = seg_addr; 734 entry = (u_long)hdr->e_entry; 735 } else { 736 data_size = seg_size; 737 data_addr = seg_addr; 738 } 739 total_size += seg_size; 740 741 /* 742 * Check limits. It should be safe to check the 743 * limits after loading the segment since we do 744 * not actually fault in all the segment's pages. 745 */ 746 if (data_size > 747 imgp->proc->p_rlimit[RLIMIT_DATA].rlim_cur || 748 text_size > maxtsiz || 749 total_size > 750 imgp->proc->p_rlimit[RLIMIT_VMEM].rlim_cur) { 751 error = ENOMEM; 752 goto fail; 753 } 754 break; 755 case PT_INTERP: /* Path to interpreter */ 756 if (phdr[i].p_filesz > MAXPATHLEN || 757 phdr[i].p_offset + phdr[i].p_filesz > PAGE_SIZE) { 758 error = ENOEXEC; 759 goto fail; 760 } 761 interp = imgp->image_header + phdr[i].p_offset; 762 break; 763 case PT_NOTE: /* Check for .note.ABI-tag */ 764 if (brand_info == NULL) 765 brand_info = elf_check_abi_note(imgp, &phdr[i]); 766 break; 767 case PT_PHDR: /* Program header table info */ 768 proghdr = phdr[i].p_vaddr; 769 break; 770 default: 771 break; 772 } 773 } 774 775 vmspace->vm_tsize = text_size >> PAGE_SHIFT; 776 vmspace->vm_taddr = (caddr_t)(uintptr_t)text_addr; 777 vmspace->vm_dsize = data_size >> PAGE_SHIFT; 778 vmspace->vm_daddr = (caddr_t)(uintptr_t)data_addr; 779 780 addr = ELF_RTLD_ADDR(vmspace); 781 782 imgp->entry_addr = entry; 783 784 /* We support three types of branding -- (1) the ELF EI_OSABI field 785 * that SCO added to the ELF spec, (2) FreeBSD 3.x's traditional string 786 * branding w/in the ELF header, and (3) path of the `interp_path' 787 * field. We should also look for an ".note.ABI-tag" ELF section now 788 * in all Linux ELF binaries, FreeBSD 4.1+, and some NetBSD ones. 789 */ 790 791 /* If the executable has a brand, search for it in the brand list. */ 792 if (brand_info == NULL && hdr->e_ident[EI_OSABI] != ELFOSABI_NONE) { 793 for (i = 0; i < MAX_BRANDS; i++) { 794 Elf_Brandinfo *bi = elf_brand_list[i]; 795 796 if (bi != NULL && 797 (hdr->e_ident[EI_OSABI] == bi->brand 798 || 0 == 799 strncmp((const char *)&hdr->e_ident[OLD_EI_BRAND], 800 bi->compat_3_brand, strlen(bi->compat_3_brand)))) { 801 brand_info = bi; 802 break; 803 } 804 } 805 } 806 807 /* Search for a recognized ABI. */ 808 if (brand_info == NULL && abi_note != NULL) { 809 } 810 811 /* 812 * ELFOSABI_NONE == ELFOSABI_SYSV, so a SYSV binary misses all 813 * checks so far, since it is neither branded nor does it have 814 * an ABI note. If the EI_OSABI field is ELFOSABI_NONE, assume 815 * it is svr4 and look for an entry in the elf_brand_list with 816 * match_abi_note == NULL. 817 */ 818 if (brand_info == NULL && hdr->e_ident[EI_OSABI] == ELFOSABI_NONE) { 819 for (i = 0; i < MAX_BRANDS; i++) { 820 Elf_Brandinfo *bi = elf_brand_list[i]; 821 822 if (bi != NULL && bi->match_abi_note == NULL && 823 ELFOSABI_SYSV == bi->brand) { 824 brand_info = bi; 825 break; 826 } 827 } 828 } 829 830 /* Lacking a recognized ABI, search for a recognized interpreter. */ 831 if (brand_info == NULL && interp != NULL) { 832 for (i = 0; i < MAX_BRANDS; i++) { 833 Elf_Brandinfo *bi = elf_brand_list[i]; 834 835 if (bi != NULL && 836 strcmp(interp, bi->interp_path) == 0) { 837 brand_info = bi; 838 break; 839 } 840 } 841 } 842 843 /* Lacking a recognized interpreter, try the default brand */ 844 if (brand_info == NULL) { 845 for (i = 0; i < MAX_BRANDS; i++) { 846 Elf_Brandinfo *bi = elf_brand_list[i]; 847 848 if (bi != NULL && fallback_elf_brand == bi->brand) { 849 brand_info = bi; 850 break; 851 } 852 } 853 } 854 855 if (brand_info == NULL) { 856 uprintf("ELF binary type \"%u\" not known.\n", 857 hdr->e_ident[EI_OSABI]); 858 error = ENOEXEC; 859 goto fail; 860 } 861 862 imgp->proc->p_sysent = brand_info->sysvec; 863 EVENTHANDLER_INVOKE(process_exec, imgp); 864 865 if (interp != NULL) { 866 path = kmalloc(MAXPATHLEN, M_TEMP, M_WAITOK); 867 ksnprintf(path, MAXPATHLEN, "%s%s", 868 brand_info->emul_path, interp); 869 if ((error = elf_load_file(imgp->proc, path, &addr, 870 &imgp->entry_addr)) != 0) { 871 if ((error = elf_load_file(imgp->proc, interp, &addr, 872 &imgp->entry_addr)) != 0) { 873 uprintf("ELF interpreter %s not found\n", path); 874 kfree(path, M_TEMP); 875 goto fail; 876 } 877 } 878 kfree(path, M_TEMP); 879 } else { 880 addr = 0; 881 } 882 883 /* 884 * Construct auxargs table (used by the fixup routine) 885 */ 886 elf_auxargs = kmalloc(sizeof(Elf_Auxargs), M_TEMP, M_WAITOK); 887 elf_auxargs->execfd = -1; 888 elf_auxargs->phdr = proghdr; 889 elf_auxargs->phent = hdr->e_phentsize; 890 elf_auxargs->phnum = hdr->e_phnum; 891 elf_auxargs->pagesz = PAGE_SIZE; 892 elf_auxargs->base = addr; 893 elf_auxargs->flags = 0; 894 elf_auxargs->entry = entry; 895 elf_auxargs->trace = elf_trace; 896 897 imgp->auxargs = elf_auxargs; 898 imgp->interpreted = 0; 899 900 fail: 901 return error; 902 } 903 904 static int 905 elf_freebsd_fixup(register_t **stack_base, struct image_params *imgp) 906 { 907 Elf_Auxargs *args = (Elf_Auxargs *)imgp->auxargs; 908 register_t *pos; 909 910 pos = *stack_base + (imgp->args->argc + imgp->args->envc + 2); 911 912 if (args->trace) { 913 AUXARGS_ENTRY(pos, AT_DEBUG, 1); 914 } 915 if (args->execfd != -1) { 916 AUXARGS_ENTRY(pos, AT_EXECFD, args->execfd); 917 } 918 AUXARGS_ENTRY(pos, AT_PHDR, args->phdr); 919 AUXARGS_ENTRY(pos, AT_PHENT, args->phent); 920 AUXARGS_ENTRY(pos, AT_PHNUM, args->phnum); 921 AUXARGS_ENTRY(pos, AT_PAGESZ, args->pagesz); 922 AUXARGS_ENTRY(pos, AT_FLAGS, args->flags); 923 AUXARGS_ENTRY(pos, AT_ENTRY, args->entry); 924 AUXARGS_ENTRY(pos, AT_BASE, args->base); 925 AUXARGS_ENTRY(pos, AT_NULL, 0); 926 927 kfree(imgp->auxargs, M_TEMP); 928 imgp->auxargs = NULL; 929 930 (*stack_base)--; 931 suword(*stack_base, (long) imgp->args->argc); 932 return 0; 933 } 934 935 /* 936 * Code for generating ELF core dumps. 937 */ 938 939 typedef int (*segment_callback) (vm_map_entry_t, void *); 940 941 /* Closure for cb_put_phdr(). */ 942 struct phdr_closure { 943 Elf_Phdr *phdr; /* Program header to fill in (incremented) */ 944 Elf_Phdr *phdr_max; /* Pointer bound for error check */ 945 Elf_Off offset; /* Offset of segment in core file */ 946 }; 947 948 /* Closure for cb_size_segment(). */ 949 struct sseg_closure { 950 int count; /* Count of writable segments. */ 951 size_t vsize; /* Total size of all writable segments. */ 952 }; 953 954 /* Closure for cb_put_fp(). */ 955 struct fp_closure { 956 struct vn_hdr *vnh; 957 struct vn_hdr *vnh_max; 958 int count; 959 struct stat *sb; 960 }; 961 962 typedef struct elf_buf { 963 char *buf; 964 size_t off; 965 size_t off_max; 966 } *elf_buf_t; 967 968 static void *target_reserve(elf_buf_t target, size_t bytes, int *error); 969 970 static int cb_put_phdr (vm_map_entry_t, void *); 971 static int cb_size_segment (vm_map_entry_t, void *); 972 static int cb_fpcount_segment(vm_map_entry_t, void *); 973 static int cb_put_fp(vm_map_entry_t, void *); 974 975 976 static int each_segment (struct proc *, segment_callback, void *, int); 977 static int elf_corehdr (struct lwp *, int, struct file *, struct ucred *, 978 int, elf_buf_t); 979 enum putmode { WRITE, DRYRUN }; 980 static int elf_puthdr (struct lwp *, elf_buf_t, int sig, enum putmode, 981 int, struct file *); 982 static int elf_putallnotes(struct lwp *, elf_buf_t, int, enum putmode); 983 static int elf_putnote (elf_buf_t, const char *, int, const void *, size_t); 984 985 static int elf_putsigs(struct lwp *, elf_buf_t); 986 static int elf_puttextvp(struct proc *, elf_buf_t); 987 static int elf_putfiles(struct proc *, elf_buf_t, struct file *); 988 989 extern int osreldate; 990 991 int 992 elf_coredump(struct lwp *lp, int sig, struct vnode *vp, off_t limit) 993 { 994 struct file *fp; 995 int error; 996 997 if ((error = falloc(NULL, &fp, NULL)) != 0) 998 return (error); 999 fsetcred(fp, lp->lwp_proc->p_ucred); 1000 1001 /* 1002 * XXX fixme. 1003 */ 1004 fp->f_type = DTYPE_VNODE; 1005 fp->f_flag = O_CREAT|O_WRONLY|O_NOFOLLOW; 1006 fp->f_ops = &vnode_fileops; 1007 fp->f_data = vp; 1008 vn_unlock(vp); 1009 1010 error = generic_elf_coredump(lp, sig, fp, limit); 1011 1012 fp->f_type = 0; 1013 fp->f_flag = 0; 1014 fp->f_ops = &badfileops; 1015 fp->f_data = NULL; 1016 fdrop(fp); 1017 return (error); 1018 } 1019 1020 int 1021 generic_elf_coredump(struct lwp *lp, int sig, struct file *fp, off_t limit) 1022 { 1023 struct proc *p = lp->lwp_proc; 1024 struct ucred *cred = p->p_ucred; 1025 int error = 0; 1026 struct sseg_closure seginfo; 1027 struct elf_buf target; 1028 1029 if (!fp) 1030 kprintf("can't dump core - null fp\n"); 1031 1032 /* 1033 * Size the program segments 1034 */ 1035 seginfo.count = 0; 1036 seginfo.vsize = 0; 1037 each_segment(p, cb_size_segment, &seginfo, 1); 1038 1039 /* 1040 * Calculate the size of the core file header area by making 1041 * a dry run of generating it. Nothing is written, but the 1042 * size is calculated. 1043 */ 1044 bzero(&target, sizeof(target)); 1045 elf_puthdr(lp, &target, sig, DRYRUN, seginfo.count, fp); 1046 1047 if (target.off + seginfo.vsize >= limit) 1048 return (EFAULT); 1049 1050 /* 1051 * Allocate memory for building the header, fill it up, 1052 * and write it out. 1053 */ 1054 target.off_max = target.off; 1055 target.off = 0; 1056 target.buf = kmalloc(target.off_max, M_TEMP, M_WAITOK|M_ZERO); 1057 1058 error = elf_corehdr(lp, sig, fp, cred, seginfo.count, &target); 1059 1060 /* Write the contents of all of the writable segments. */ 1061 if (error == 0) { 1062 Elf_Phdr *php; 1063 int i; 1064 ssize_t nbytes; 1065 1066 php = (Elf_Phdr *)(target.buf + sizeof(Elf_Ehdr)) + 1; 1067 for (i = 0; i < seginfo.count; i++) { 1068 error = fp_write(fp, (caddr_t)php->p_vaddr, 1069 php->p_filesz, &nbytes, UIO_USERSPACE); 1070 if (error != 0) 1071 break; 1072 php++; 1073 } 1074 } 1075 kfree(target.buf, M_TEMP); 1076 1077 return error; 1078 } 1079 1080 /* 1081 * A callback for each_segment() to write out the segment's 1082 * program header entry. 1083 */ 1084 static int 1085 cb_put_phdr(vm_map_entry_t entry, void *closure) 1086 { 1087 struct phdr_closure *phc = closure; 1088 Elf_Phdr *phdr = phc->phdr; 1089 1090 if (phc->phdr == phc->phdr_max) 1091 return EINVAL; 1092 1093 phc->offset = round_page(phc->offset); 1094 1095 phdr->p_type = PT_LOAD; 1096 phdr->p_offset = phc->offset; 1097 phdr->p_vaddr = entry->start; 1098 phdr->p_paddr = 0; 1099 phdr->p_filesz = phdr->p_memsz = entry->end - entry->start; 1100 phdr->p_align = PAGE_SIZE; 1101 phdr->p_flags = 0; 1102 if (entry->protection & VM_PROT_READ) 1103 phdr->p_flags |= PF_R; 1104 if (entry->protection & VM_PROT_WRITE) 1105 phdr->p_flags |= PF_W; 1106 if (entry->protection & VM_PROT_EXECUTE) 1107 phdr->p_flags |= PF_X; 1108 1109 phc->offset += phdr->p_filesz; 1110 ++phc->phdr; 1111 return 0; 1112 } 1113 1114 /* 1115 * A callback for each_writable_segment() to gather information about 1116 * the number of segments and their total size. 1117 */ 1118 static int 1119 cb_size_segment(vm_map_entry_t entry, void *closure) 1120 { 1121 struct sseg_closure *ssc = closure; 1122 1123 ++ssc->count; 1124 ssc->vsize += entry->end - entry->start; 1125 return 0; 1126 } 1127 1128 /* 1129 * A callback for each_segment() to gather information about 1130 * the number of text segments. 1131 */ 1132 static int 1133 cb_fpcount_segment(vm_map_entry_t entry, void *closure) 1134 { 1135 int *count = closure; 1136 struct vnode *vp; 1137 1138 if (entry->object.vm_object->type == OBJT_VNODE) { 1139 vp = (struct vnode *)entry->object.vm_object->handle; 1140 if ((vp->v_flag & VCKPT) && curproc->p_textvp == vp) 1141 return 0; 1142 ++*count; 1143 } 1144 return 0; 1145 } 1146 1147 static int 1148 cb_put_fp(vm_map_entry_t entry, void *closure) 1149 { 1150 struct fp_closure *fpc = closure; 1151 struct vn_hdr *vnh = fpc->vnh; 1152 Elf_Phdr *phdr = &vnh->vnh_phdr; 1153 struct vnode *vp; 1154 int error; 1155 1156 /* 1157 * If an entry represents a vnode then write out a file handle. 1158 * 1159 * If we are checkpointing a checkpoint-restored program we do 1160 * NOT record the filehandle for the old checkpoint vnode (which 1161 * is mapped all over the place). Instead we rely on the fact 1162 * that a checkpoint-restored program does not mmap() the checkpt 1163 * vnode NOCORE, so its contents will be written out to the 1164 * new checkpoint file. This is necessary because the 'old' 1165 * checkpoint file is typically destroyed when a new one is created 1166 * and thus cannot be used to restore the new checkpoint. 1167 * 1168 * Theoretically we could create a chain of checkpoint files and 1169 * operate the checkpointing operation kinda like an incremental 1170 * checkpoint, but a checkpoint restore would then likely wind up 1171 * referencing many prior checkpoint files and that is a bit over 1172 * the top for the purpose of the checkpoint API. 1173 */ 1174 if (entry->object.vm_object->type == OBJT_VNODE) { 1175 vp = (struct vnode *)entry->object.vm_object->handle; 1176 if ((vp->v_flag & VCKPT) && curproc->p_textvp == vp) 1177 return 0; 1178 if (vnh == fpc->vnh_max) 1179 return EINVAL; 1180 1181 if (vp->v_mount) 1182 vnh->vnh_fh.fh_fsid = vp->v_mount->mnt_stat.f_fsid; 1183 error = VFS_VPTOFH(vp, &vnh->vnh_fh.fh_fid); 1184 if (error) { 1185 char *freepath, *fullpath; 1186 1187 if (vn_fullpath(curproc, vp, &fullpath, &freepath, 0)) { 1188 kprintf("Warning: coredump, error %d: cannot store file handle for vnode %p\n", error, vp); 1189 } else { 1190 kprintf("Warning: coredump, error %d: cannot store file handle for %s\n", error, fullpath); 1191 kfree(freepath, M_TEMP); 1192 } 1193 error = 0; 1194 } 1195 1196 phdr->p_type = PT_LOAD; 1197 phdr->p_offset = 0; /* not written to core */ 1198 phdr->p_vaddr = entry->start; 1199 phdr->p_paddr = 0; 1200 phdr->p_filesz = phdr->p_memsz = entry->end - entry->start; 1201 phdr->p_align = PAGE_SIZE; 1202 phdr->p_flags = 0; 1203 if (entry->protection & VM_PROT_READ) 1204 phdr->p_flags |= PF_R; 1205 if (entry->protection & VM_PROT_WRITE) 1206 phdr->p_flags |= PF_W; 1207 if (entry->protection & VM_PROT_EXECUTE) 1208 phdr->p_flags |= PF_X; 1209 ++fpc->vnh; 1210 ++fpc->count; 1211 } 1212 return 0; 1213 } 1214 1215 /* 1216 * For each writable segment in the process's memory map, call the given 1217 * function with a pointer to the map entry and some arbitrary 1218 * caller-supplied data. 1219 */ 1220 static int 1221 each_segment(struct proc *p, segment_callback func, void *closure, int writable) 1222 { 1223 int error = 0; 1224 vm_map_t map = &p->p_vmspace->vm_map; 1225 vm_map_entry_t entry; 1226 1227 for (entry = map->header.next; error == 0 && entry != &map->header; 1228 entry = entry->next) { 1229 vm_object_t obj; 1230 1231 /* 1232 * Don't dump inaccessible mappings, deal with legacy 1233 * coredump mode. 1234 * 1235 * Note that read-only segments related to the elf binary 1236 * are marked MAP_ENTRY_NOCOREDUMP now so we no longer 1237 * need to arbitrarily ignore such segments. 1238 */ 1239 if (elf_legacy_coredump) { 1240 if (writable && (entry->protection & VM_PROT_RW) != VM_PROT_RW) 1241 continue; 1242 } else { 1243 if (writable && (entry->protection & VM_PROT_ALL) == 0) 1244 continue; 1245 } 1246 1247 /* 1248 * Dont include memory segment in the coredump if 1249 * MAP_NOCORE is set in mmap(2) or MADV_NOCORE in 1250 * madvise(2). 1251 * 1252 * Currently we only dump normal VM object maps. We do 1253 * not dump submaps or virtual page tables. 1254 */ 1255 if (writable && (entry->eflags & MAP_ENTRY_NOCOREDUMP)) 1256 continue; 1257 if (entry->maptype != VM_MAPTYPE_NORMAL) 1258 continue; 1259 if ((obj = entry->object.vm_object) == NULL) 1260 continue; 1261 1262 /* Find the deepest backing object. */ 1263 while (obj->backing_object != NULL) 1264 obj = obj->backing_object; 1265 1266 /* Ignore memory-mapped devices and such things. */ 1267 if (obj->type != OBJT_DEFAULT && 1268 obj->type != OBJT_SWAP && 1269 obj->type != OBJT_VNODE) 1270 continue; 1271 1272 error = (*func)(entry, closure); 1273 } 1274 return error; 1275 } 1276 1277 static 1278 void * 1279 target_reserve(elf_buf_t target, size_t bytes, int *error) 1280 { 1281 void *res = NULL; 1282 1283 if (target->buf) { 1284 if (target->off + bytes > target->off_max) 1285 *error = EINVAL; 1286 else 1287 res = target->buf + target->off; 1288 } 1289 target->off += bytes; 1290 return (res); 1291 } 1292 1293 /* 1294 * Write the core file header to the file, including padding up to 1295 * the page boundary. 1296 */ 1297 static int 1298 elf_corehdr(struct lwp *lp, int sig, struct file *fp, struct ucred *cred, 1299 int numsegs, elf_buf_t target) 1300 { 1301 int error; 1302 ssize_t nbytes; 1303 1304 /* 1305 * Fill in the header. The fp is passed so we can detect and flag 1306 * a checkpoint file pointer within the core file itself, because 1307 * it may not be restored from the same file handle. 1308 */ 1309 error = elf_puthdr(lp, target, sig, WRITE, numsegs, fp); 1310 1311 /* Write it to the core file. */ 1312 if (error == 0) { 1313 error = fp_write(fp, target->buf, target->off, &nbytes, 1314 UIO_SYSSPACE); 1315 } 1316 return error; 1317 } 1318 1319 static int 1320 elf_puthdr(struct lwp *lp, elf_buf_t target, int sig, enum putmode mode, 1321 int numsegs, struct file *fp) 1322 { 1323 struct proc *p = lp->lwp_proc; 1324 int error = 0; 1325 size_t phoff; 1326 size_t noteoff; 1327 size_t notesz; 1328 Elf_Ehdr *ehdr; 1329 Elf_Phdr *phdr; 1330 1331 ehdr = target_reserve(target, sizeof(Elf_Ehdr), &error); 1332 1333 phoff = target->off; 1334 phdr = target_reserve(target, (numsegs + 1) * sizeof(Elf_Phdr), &error); 1335 1336 noteoff = target->off; 1337 if (error == 0) 1338 elf_putallnotes(lp, target, sig, mode); 1339 notesz = target->off - noteoff; 1340 1341 /* 1342 * put extra cruft for dumping process state here 1343 * - we really want it be before all the program 1344 * mappings 1345 * - we just need to update the offset accordingly 1346 * and GDB will be none the wiser. 1347 */ 1348 if (error == 0) 1349 error = elf_puttextvp(p, target); 1350 if (error == 0) 1351 error = elf_putsigs(lp, target); 1352 if (error == 0) 1353 error = elf_putfiles(p, target, fp); 1354 1355 /* 1356 * Align up to a page boundary for the program segments. The 1357 * actual data will be written to the outptu file, not to elf_buf_t, 1358 * so we do not have to do any further bounds checking. 1359 */ 1360 target->off = round_page(target->off); 1361 if (error == 0 && ehdr != NULL) { 1362 /* 1363 * Fill in the ELF header. 1364 */ 1365 ehdr->e_ident[EI_MAG0] = ELFMAG0; 1366 ehdr->e_ident[EI_MAG1] = ELFMAG1; 1367 ehdr->e_ident[EI_MAG2] = ELFMAG2; 1368 ehdr->e_ident[EI_MAG3] = ELFMAG3; 1369 ehdr->e_ident[EI_CLASS] = ELF_CLASS; 1370 ehdr->e_ident[EI_DATA] = ELF_DATA; 1371 ehdr->e_ident[EI_VERSION] = EV_CURRENT; 1372 ehdr->e_ident[EI_OSABI] = ELFOSABI_NONE; 1373 ehdr->e_ident[EI_ABIVERSION] = 0; 1374 ehdr->e_ident[EI_PAD] = 0; 1375 ehdr->e_type = ET_CORE; 1376 ehdr->e_machine = ELF_ARCH; 1377 ehdr->e_version = EV_CURRENT; 1378 ehdr->e_entry = 0; 1379 ehdr->e_phoff = phoff; 1380 ehdr->e_flags = 0; 1381 ehdr->e_ehsize = sizeof(Elf_Ehdr); 1382 ehdr->e_phentsize = sizeof(Elf_Phdr); 1383 ehdr->e_phnum = numsegs + 1; 1384 ehdr->e_shentsize = sizeof(Elf_Shdr); 1385 ehdr->e_shnum = 0; 1386 ehdr->e_shstrndx = SHN_UNDEF; 1387 } 1388 if (error == 0 && phdr != NULL) { 1389 /* 1390 * Fill in the program header entries. 1391 */ 1392 struct phdr_closure phc; 1393 1394 /* The note segement. */ 1395 phdr->p_type = PT_NOTE; 1396 phdr->p_offset = noteoff; 1397 phdr->p_vaddr = 0; 1398 phdr->p_paddr = 0; 1399 phdr->p_filesz = notesz; 1400 phdr->p_memsz = 0; 1401 phdr->p_flags = 0; 1402 phdr->p_align = 0; 1403 ++phdr; 1404 1405 /* All the writable segments from the program. */ 1406 phc.phdr = phdr; 1407 phc.phdr_max = phdr + numsegs; 1408 phc.offset = target->off; 1409 each_segment(p, cb_put_phdr, &phc, 1); 1410 } 1411 return (error); 1412 } 1413 1414 /* 1415 * Append core dump notes to target ELF buffer or simply update target size 1416 * if dryrun selected. 1417 */ 1418 static int 1419 elf_putallnotes(struct lwp *corelp, elf_buf_t target, int sig, 1420 enum putmode mode) 1421 { 1422 struct proc *p = corelp->lwp_proc; 1423 int error; 1424 struct { 1425 prstatus_t status; 1426 prfpregset_t fpregs; 1427 prpsinfo_t psinfo; 1428 } *tmpdata; 1429 prstatus_t *status; 1430 prfpregset_t *fpregs; 1431 prpsinfo_t *psinfo; 1432 struct lwp *lp; 1433 1434 /* 1435 * Allocate temporary storage for notes on heap to avoid stack overflow. 1436 */ 1437 if (mode != DRYRUN) { 1438 tmpdata = kmalloc(sizeof(*tmpdata), M_TEMP, M_ZERO | M_WAITOK); 1439 status = &tmpdata->status; 1440 fpregs = &tmpdata->fpregs; 1441 psinfo = &tmpdata->psinfo; 1442 } else { 1443 tmpdata = NULL; 1444 status = NULL; 1445 fpregs = NULL; 1446 psinfo = NULL; 1447 } 1448 1449 /* 1450 * Append LWP-agnostic note. 1451 */ 1452 if (mode != DRYRUN) { 1453 psinfo->pr_version = PRPSINFO_VERSION; 1454 psinfo->pr_psinfosz = sizeof(prpsinfo_t); 1455 strncpy(psinfo->pr_fname, p->p_comm, 1456 sizeof(psinfo->pr_fname) - 1); 1457 /* 1458 * XXX - We don't fill in the command line arguments 1459 * properly yet. 1460 */ 1461 strncpy(psinfo->pr_psargs, p->p_comm, PRARGSZ); 1462 } 1463 error = 1464 elf_putnote(target, "CORE", NT_PRPSINFO, psinfo, sizeof *psinfo); 1465 if (error) 1466 goto exit; 1467 1468 /* 1469 * Append first note for LWP that triggered core so that it is 1470 * the selected one when the debugger starts. 1471 */ 1472 if (mode != DRYRUN) { 1473 status->pr_version = PRSTATUS_VERSION; 1474 status->pr_statussz = sizeof(prstatus_t); 1475 status->pr_gregsetsz = sizeof(gregset_t); 1476 status->pr_fpregsetsz = sizeof(fpregset_t); 1477 status->pr_osreldate = osreldate; 1478 status->pr_cursig = sig; 1479 /* 1480 * XXX GDB needs unique pr_pid for each LWP and does not 1481 * not support pr_pid==0 but lwp_tid can be 0, so hack unique 1482 * value. 1483 */ 1484 status->pr_pid = corelp->lwp_tid; 1485 fill_regs(corelp, &status->pr_reg); 1486 fill_fpregs(corelp, fpregs); 1487 } 1488 error = 1489 elf_putnote(target, "CORE", NT_PRSTATUS, status, sizeof *status); 1490 if (error) 1491 goto exit; 1492 error = 1493 elf_putnote(target, "CORE", NT_FPREGSET, fpregs, sizeof *fpregs); 1494 if (error) 1495 goto exit; 1496 1497 /* 1498 * Then append notes for other LWPs. 1499 */ 1500 FOREACH_LWP_IN_PROC(lp, p) { 1501 if (lp == corelp) 1502 continue; 1503 /* skip lwps being created */ 1504 if (lp->lwp_thread == NULL) 1505 continue; 1506 if (mode != DRYRUN) { 1507 status->pr_pid = lp->lwp_tid; 1508 fill_regs(lp, &status->pr_reg); 1509 fill_fpregs(lp, fpregs); 1510 } 1511 error = elf_putnote(target, "CORE", NT_PRSTATUS, 1512 status, sizeof *status); 1513 if (error) 1514 goto exit; 1515 error = elf_putnote(target, "CORE", NT_FPREGSET, 1516 fpregs, sizeof *fpregs); 1517 if (error) 1518 goto exit; 1519 } 1520 1521 exit: 1522 if (tmpdata != NULL) 1523 kfree(tmpdata, M_TEMP); 1524 return (error); 1525 } 1526 1527 /* 1528 * Generate a note sub-structure. 1529 * 1530 * NOTE: 4-byte alignment. 1531 */ 1532 static int 1533 elf_putnote(elf_buf_t target, const char *name, int type, 1534 const void *desc, size_t descsz) 1535 { 1536 int error = 0; 1537 char *dst; 1538 Elf_Note note; 1539 1540 note.n_namesz = strlen(name) + 1; 1541 note.n_descsz = descsz; 1542 note.n_type = type; 1543 dst = target_reserve(target, sizeof(note), &error); 1544 if (dst != NULL) 1545 bcopy(¬e, dst, sizeof note); 1546 dst = target_reserve(target, note.n_namesz, &error); 1547 if (dst != NULL) 1548 bcopy(name, dst, note.n_namesz); 1549 target->off = roundup2(target->off, sizeof(Elf_Word)); 1550 dst = target_reserve(target, note.n_descsz, &error); 1551 if (dst != NULL) 1552 bcopy(desc, dst, note.n_descsz); 1553 target->off = roundup2(target->off, sizeof(Elf_Word)); 1554 return(error); 1555 } 1556 1557 1558 static int 1559 elf_putsigs(struct lwp *lp, elf_buf_t target) 1560 { 1561 /* XXX lwp handle more than one lwp */ 1562 struct proc *p = lp->lwp_proc; 1563 int error = 0; 1564 struct ckpt_siginfo *csi; 1565 1566 csi = target_reserve(target, sizeof(struct ckpt_siginfo), &error); 1567 if (csi) { 1568 csi->csi_ckptpisz = sizeof(struct ckpt_siginfo); 1569 bcopy(p->p_sigacts, &csi->csi_sigacts, sizeof(*p->p_sigacts)); 1570 bcopy(&p->p_realtimer, &csi->csi_itimerval, sizeof(struct itimerval)); 1571 bcopy(&lp->lwp_sigmask, &csi->csi_sigmask, 1572 sizeof(sigset_t)); 1573 csi->csi_sigparent = p->p_sigparent; 1574 } 1575 return(error); 1576 } 1577 1578 static int 1579 elf_putfiles(struct proc *p, elf_buf_t target, struct file *ckfp) 1580 { 1581 int error = 0; 1582 int i; 1583 struct ckpt_filehdr *cfh = NULL; 1584 struct ckpt_fileinfo *cfi; 1585 struct file *fp; 1586 struct vnode *vp; 1587 /* 1588 * the duplicated loop is gross, but it was the only way 1589 * to eliminate uninitialized variable warnings 1590 */ 1591 cfh = target_reserve(target, sizeof(struct ckpt_filehdr), &error); 1592 if (cfh) { 1593 cfh->cfh_nfiles = 0; 1594 } 1595 1596 /* 1597 * ignore STDIN/STDERR/STDOUT. 1598 */ 1599 for (i = 3; error == 0 && i < p->p_fd->fd_nfiles; i++) { 1600 fp = holdfp(p->p_fd, i, -1); 1601 if (fp == NULL) 1602 continue; 1603 /* 1604 * XXX Only checkpoint vnodes for now. 1605 */ 1606 if (fp->f_type != DTYPE_VNODE) { 1607 fdrop(fp); 1608 continue; 1609 } 1610 cfi = target_reserve(target, sizeof(struct ckpt_fileinfo), 1611 &error); 1612 if (cfi == NULL) { 1613 fdrop(fp); 1614 continue; 1615 } 1616 cfi->cfi_index = -1; 1617 cfi->cfi_type = fp->f_type; 1618 cfi->cfi_flags = fp->f_flag; 1619 cfi->cfi_offset = fp->f_offset; 1620 cfi->cfi_ckflags = 0; 1621 1622 if (fp == ckfp) 1623 cfi->cfi_ckflags |= CKFIF_ISCKPTFD; 1624 /* f_count and f_msgcount should not be saved/restored */ 1625 /* XXX save cred info */ 1626 1627 switch(fp->f_type) { 1628 case DTYPE_VNODE: 1629 vp = (struct vnode *)fp->f_data; 1630 /* 1631 * it looks like a bug in ptrace is marking 1632 * a non-vnode as a vnode - until we find the 1633 * root cause this will at least prevent 1634 * further panics from truss 1635 */ 1636 if (vp == NULL || vp->v_mount == NULL) 1637 break; 1638 cfh->cfh_nfiles++; 1639 cfi->cfi_index = i; 1640 cfi->cfi_fh.fh_fsid = vp->v_mount->mnt_stat.f_fsid; 1641 error = VFS_VPTOFH(vp, &cfi->cfi_fh.fh_fid); 1642 break; 1643 default: 1644 break; 1645 } 1646 fdrop(fp); 1647 } 1648 return(error); 1649 } 1650 1651 static int 1652 elf_puttextvp(struct proc *p, elf_buf_t target) 1653 { 1654 int error = 0; 1655 int *vn_count; 1656 struct fp_closure fpc; 1657 struct ckpt_vminfo *vminfo; 1658 1659 vminfo = target_reserve(target, sizeof(struct ckpt_vminfo), &error); 1660 if (vminfo != NULL) { 1661 vminfo->cvm_dsize = p->p_vmspace->vm_dsize; 1662 vminfo->cvm_tsize = p->p_vmspace->vm_tsize; 1663 vminfo->cvm_daddr = p->p_vmspace->vm_daddr; 1664 vminfo->cvm_taddr = p->p_vmspace->vm_taddr; 1665 } 1666 1667 fpc.count = 0; 1668 vn_count = target_reserve(target, sizeof(int), &error); 1669 if (target->buf != NULL) { 1670 fpc.vnh = (struct vn_hdr *)(target->buf + target->off); 1671 fpc.vnh_max = fpc.vnh + 1672 (target->off_max - target->off) / sizeof(struct vn_hdr); 1673 error = each_segment(p, cb_put_fp, &fpc, 0); 1674 if (vn_count) 1675 *vn_count = fpc.count; 1676 } else { 1677 error = each_segment(p, cb_fpcount_segment, &fpc.count, 0); 1678 } 1679 target->off += fpc.count * sizeof(struct vn_hdr); 1680 return(error); 1681 } 1682 1683 1684 /* 1685 * Tell kern_execve.c about it, with a little help from the linker. 1686 */ 1687 static struct execsw elf_execsw = {exec_elf_imgact, "ELF"}; 1688 EXEC_SET_ORDERED(elf, elf_execsw, SI_ORDER_FIRST); 1689