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