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