1 /*- 2 * Copyright (c) 1995-1996 S�ren Schmidt 3 * Copyright (c) 1996 Peter Wemm 4 * All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer 11 * in this position and unchanged. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. The name of the author may not be used to endorse or promote products 16 * derived from this software withough specific prior written permission 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 19 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 20 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 21 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 22 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 23 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 24 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 25 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 26 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 27 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 28 * 29 * $FreeBSD: src/sys/kern/imgact_elf.c,v 1.73.2.13 2002/12/28 19:49:41 dillon Exp $ 30 * $DragonFly: src/sys/kern/imgact_elf.c,v 1.55 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/sfbuf.h> 55 56 #include <vm/vm.h> 57 #include <vm/vm_kern.h> 58 #include <vm/vm_param.h> 59 #include <vm/pmap.h> 60 #include <sys/lock.h> 61 #include <vm/vm_map.h> 62 #include <vm/vm_object.h> 63 #include <vm/vm_extern.h> 64 65 #include <machine/elf.h> 66 #include <machine/md_var.h> 67 #include <sys/mount.h> 68 #include <sys/ckpt.h> 69 #define OLD_EI_BRAND 8 70 71 __ElfType(Brandinfo); 72 __ElfType(Auxargs); 73 74 static int elf_check_header (const Elf_Ehdr *hdr); 75 static int elf_freebsd_fixup (register_t **stack_base, 76 struct image_params *imgp); 77 static int elf_load_file (struct proc *p, const char *file, u_long *addr, 78 u_long *entry); 79 static int elf_load_section (struct proc *p, 80 struct vmspace *vmspace, struct vnode *vp, 81 vm_offset_t offset, caddr_t vmaddr, size_t memsz, size_t filsz, 82 vm_prot_t prot); 83 static int exec_elf_imgact (struct image_params *imgp); 84 85 static int elf_trace = 0; 86 SYSCTL_INT(_debug, OID_AUTO, elf_trace, CTLFLAG_RW, &elf_trace, 0, ""); 87 static int elf_legacy_coredump = 0; 88 SYSCTL_INT(_debug, OID_AUTO, elf_legacy_coredump, CTLFLAG_RW, 89 &elf_legacy_coredump, 0, ""); 90 91 static int dragonfly_match_abi_note(const Elf_Note *); 92 static int freebsd_match_abi_note(const Elf_Note *); 93 94 static struct sysentvec elf_freebsd_sysvec = { 95 SYS_MAXSYSCALL, 96 sysent, 97 -1, 98 0, 99 0, 100 0, 101 0, 102 0, 103 elf_freebsd_fixup, 104 sendsig, 105 sigcode, 106 &szsigcode, 107 0, 108 "FreeBSD ELF", 109 elf_coredump, 110 NULL, 111 MINSIGSTKSZ 112 }; 113 114 static Elf_Brandinfo freebsd_brand_info = { 115 ELFOSABI_FREEBSD, 116 "FreeBSD", 117 freebsd_match_abi_note, 118 "", 119 "/usr/libexec/ld-elf.so.1", 120 &elf_freebsd_sysvec 121 }; 122 123 static Elf_Brandinfo dragonfly_brand_info = { 124 ELFOSABI_NONE, 125 "DragonFly", 126 dragonfly_match_abi_note, 127 "", 128 "/usr/libexec/ld-elf.so.2", 129 &elf_freebsd_sysvec 130 }; 131 132 static Elf_Brandinfo *elf_brand_list[MAX_BRANDS] = { 133 &dragonfly_brand_info, 134 &freebsd_brand_info, 135 NULL, NULL, NULL, 136 NULL, NULL, NULL 137 }; 138 139 static int 140 freebsd_match_abi_note(const Elf_Note *abi_note) 141 { 142 const char *abi_name = (const char *) 143 ((const uint8_t *)abi_note + sizeof(*abi_note)); 144 145 if (abi_note->n_namesz != sizeof("FreeBSD")) 146 return(FALSE); 147 if (memcmp(abi_name, "FreeBSD", sizeof("FreeBSD"))) 148 return(FALSE); 149 return(TRUE); 150 } 151 152 static int 153 dragonfly_match_abi_note(const Elf_Note *abi_note) 154 { 155 const char *abi_name = (const char *) 156 ((const uint8_t *)abi_note + sizeof(*abi_note)); 157 158 if (abi_note->n_namesz != sizeof("DragonFly")) 159 return(FALSE); 160 if (memcmp(abi_name, "DragonFly", sizeof("DragonFly"))) 161 return(FALSE); 162 return(TRUE); 163 } 164 165 int 166 elf_insert_brand_entry(Elf_Brandinfo *entry) 167 { 168 int i; 169 170 for (i=1; i<MAX_BRANDS; i++) { 171 if (elf_brand_list[i] == NULL) { 172 elf_brand_list[i] = entry; 173 break; 174 } 175 } 176 if (i == MAX_BRANDS) 177 return -1; 178 return 0; 179 } 180 181 int 182 elf_remove_brand_entry(Elf_Brandinfo *entry) 183 { 184 int i; 185 186 for (i=1; i<MAX_BRANDS; i++) { 187 if (elf_brand_list[i] == entry) { 188 elf_brand_list[i] = NULL; 189 break; 190 } 191 } 192 if (i == MAX_BRANDS) 193 return -1; 194 return 0; 195 } 196 197 /* 198 * Check if an elf brand is being used anywhere in the system. 199 * 200 * Used by the linux emulation module unloader. This isn't safe from 201 * races. 202 */ 203 struct elf_brand_inuse_info { 204 int rval; 205 Elf_Brandinfo *entry; 206 }; 207 208 static int elf_brand_inuse_callback(struct proc *p, void *data); 209 210 int 211 elf_brand_inuse(Elf_Brandinfo *entry) 212 { 213 struct elf_brand_inuse_info info; 214 215 info.rval = FALSE; 216 info.entry = entry; 217 allproc_scan(elf_brand_inuse_callback, entry); 218 return (info.rval); 219 } 220 221 static 222 int 223 elf_brand_inuse_callback(struct proc *p, void *data) 224 { 225 struct elf_brand_inuse_info *info = data; 226 227 if (p->p_sysent == info->entry->sysvec) { 228 info->rval = TRUE; 229 return(-1); 230 } 231 return(0); 232 } 233 234 static int 235 elf_check_header(const Elf_Ehdr *hdr) 236 { 237 if (!IS_ELF(*hdr) || 238 hdr->e_ident[EI_CLASS] != ELF_TARG_CLASS || 239 hdr->e_ident[EI_DATA] != ELF_TARG_DATA || 240 hdr->e_ident[EI_VERSION] != EV_CURRENT || 241 hdr->e_phentsize != sizeof(Elf_Phdr) || 242 hdr->e_ehsize != sizeof(Elf_Ehdr) || 243 hdr->e_version != ELF_TARG_VER) 244 return ENOEXEC; 245 246 if (!ELF_MACHINE_OK(hdr->e_machine)) 247 return ENOEXEC; 248 249 return 0; 250 } 251 252 static int 253 elf_load_section(struct proc *p, struct vmspace *vmspace, struct vnode *vp, 254 vm_offset_t offset, caddr_t vmaddr, size_t memsz, 255 size_t filsz, vm_prot_t prot) 256 { 257 size_t map_len; 258 vm_offset_t map_addr; 259 int error, rv, cow; 260 int count; 261 size_t copy_len; 262 vm_object_t object; 263 vm_offset_t file_addr; 264 265 object = vp->v_object; 266 error = 0; 267 268 /* 269 * It's necessary to fail if the filsz + offset taken from the 270 * header is greater than the actual file pager object's size. 271 * If we were to allow this, then the vm_map_find() below would 272 * walk right off the end of the file object and into the ether. 273 * 274 * While I'm here, might as well check for something else that 275 * is invalid: filsz cannot be greater than memsz. 276 */ 277 if ((off_t)filsz + offset > vp->v_filesize || filsz > memsz) { 278 uprintf("elf_load_section: truncated ELF file\n"); 279 return (ENOEXEC); 280 } 281 282 map_addr = trunc_page((vm_offset_t)vmaddr); 283 file_addr = trunc_page(offset); 284 285 /* 286 * We have two choices. We can either clear the data in the last page 287 * of an oversized mapping, or we can start the anon mapping a page 288 * early and copy the initialized data into that first page. We 289 * choose the second.. 290 */ 291 if (memsz > filsz) 292 map_len = trunc_page(offset+filsz) - file_addr; 293 else 294 map_len = round_page(offset+filsz) - file_addr; 295 296 if (map_len != 0) { 297 vm_object_reference(object); 298 299 /* cow flags: don't dump readonly sections in core */ 300 cow = MAP_COPY_ON_WRITE | MAP_PREFAULT | 301 (prot & VM_PROT_WRITE ? 0 : MAP_DISABLE_COREDUMP); 302 303 count = vm_map_entry_reserve(MAP_RESERVE_COUNT); 304 vm_map_lock(&vmspace->vm_map); 305 rv = vm_map_insert(&vmspace->vm_map, &count, 306 object, 307 file_addr, /* file offset */ 308 map_addr, /* virtual start */ 309 map_addr + map_len,/* virtual end */ 310 VM_MAPTYPE_NORMAL, 311 prot, VM_PROT_ALL, 312 cow); 313 vm_map_unlock(&vmspace->vm_map); 314 vm_map_entry_release(count); 315 if (rv != KERN_SUCCESS) { 316 vm_object_deallocate(object); 317 return EINVAL; 318 } 319 320 /* we can stop now if we've covered it all */ 321 if (memsz == filsz) { 322 return 0; 323 } 324 } 325 326 327 /* 328 * We have to get the remaining bit of the file into the first part 329 * of the oversized map segment. This is normally because the .data 330 * segment in the file is extended to provide bss. It's a neat idea 331 * to try and save a page, but it's a pain in the behind to implement. 332 */ 333 copy_len = (offset + filsz) - trunc_page(offset + filsz); 334 map_addr = trunc_page((vm_offset_t)vmaddr + filsz); 335 map_len = round_page((vm_offset_t)vmaddr + memsz) - map_addr; 336 337 /* This had damn well better be true! */ 338 if (map_len != 0) { 339 count = vm_map_entry_reserve(MAP_RESERVE_COUNT); 340 vm_map_lock(&vmspace->vm_map); 341 rv = vm_map_insert(&vmspace->vm_map, &count, 342 NULL, 0, 343 map_addr, map_addr + map_len, 344 VM_MAPTYPE_NORMAL, 345 VM_PROT_ALL, VM_PROT_ALL, 346 0); 347 vm_map_unlock(&vmspace->vm_map); 348 vm_map_entry_release(count); 349 if (rv != KERN_SUCCESS) { 350 return EINVAL; 351 } 352 } 353 354 if (copy_len != 0) { 355 vm_page_t m; 356 struct sf_buf *sf; 357 358 m = vm_fault_object_page(object, trunc_page(offset + filsz), 359 VM_PROT_READ, 0, &error); 360 if (m) { 361 sf = sf_buf_alloc(m, SFB_CPUPRIVATE); 362 error = copyout((caddr_t)sf_buf_kva(sf), 363 (caddr_t)map_addr, copy_len); 364 sf_buf_free(sf); 365 vm_page_unhold(m); 366 } 367 if (error) { 368 return (error); 369 } 370 } 371 372 /* 373 * set it to the specified protection 374 */ 375 vm_map_protect(&vmspace->vm_map, map_addr, map_addr + map_len, prot, 376 FALSE); 377 378 return error; 379 } 380 381 /* 382 * Load the file "file" into memory. It may be either a shared object 383 * or an executable. 384 * 385 * The "addr" reference parameter is in/out. On entry, it specifies 386 * the address where a shared object should be loaded. If the file is 387 * an executable, this value is ignored. On exit, "addr" specifies 388 * where the file was actually loaded. 389 * 390 * The "entry" reference parameter is out only. On exit, it specifies 391 * the entry point for the loaded file. 392 */ 393 static int 394 elf_load_file(struct proc *p, const char *file, u_long *addr, u_long *entry) 395 { 396 struct { 397 struct nlookupdata nd; 398 struct vattr attr; 399 struct image_params image_params; 400 } *tempdata; 401 const Elf_Ehdr *hdr = NULL; 402 const Elf_Phdr *phdr = NULL; 403 struct nlookupdata *nd; 404 struct vmspace *vmspace = p->p_vmspace; 405 struct vattr *attr; 406 struct image_params *imgp; 407 vm_prot_t prot; 408 u_long rbase; 409 u_long base_addr = 0; 410 int error, i, numsegs; 411 412 tempdata = kmalloc(sizeof(*tempdata), M_TEMP, M_WAITOK); 413 nd = &tempdata->nd; 414 attr = &tempdata->attr; 415 imgp = &tempdata->image_params; 416 417 /* 418 * Initialize part of the common data 419 */ 420 imgp->proc = p; 421 imgp->attr = attr; 422 imgp->firstpage = NULL; 423 imgp->image_header = NULL; 424 imgp->vp = NULL; 425 426 error = nlookup_init(nd, file, UIO_SYSSPACE, NLC_FOLLOW); 427 if (error == 0) 428 error = nlookup(nd); 429 if (error == 0) 430 error = cache_vget(&nd->nl_nch, nd->nl_cred, LK_EXCLUSIVE, &imgp->vp); 431 nlookup_done(nd); 432 if (error) 433 goto fail; 434 435 /* 436 * Check permissions, modes, uid, etc on the file, and "open" it. 437 */ 438 error = exec_check_permissions(imgp); 439 if (error) { 440 vn_unlock(imgp->vp); 441 goto fail; 442 } 443 444 error = exec_map_first_page(imgp); 445 /* 446 * Also make certain that the interpreter stays the same, so set 447 * its VTEXT flag, too. 448 */ 449 if (error == 0) 450 imgp->vp->v_flag |= VTEXT; 451 vn_unlock(imgp->vp); 452 if (error) 453 goto fail; 454 455 hdr = (const Elf_Ehdr *)imgp->image_header; 456 if ((error = elf_check_header(hdr)) != 0) 457 goto fail; 458 if (hdr->e_type == ET_DYN) 459 rbase = *addr; 460 else if (hdr->e_type == ET_EXEC) 461 rbase = 0; 462 else { 463 error = ENOEXEC; 464 goto fail; 465 } 466 467 /* Only support headers that fit within first page for now 468 * (multiplication of two Elf_Half fields will not overflow) */ 469 if ((hdr->e_phoff > PAGE_SIZE) || 470 (hdr->e_phentsize * hdr->e_phnum) > PAGE_SIZE - hdr->e_phoff) { 471 error = ENOEXEC; 472 goto fail; 473 } 474 475 phdr = (const Elf_Phdr *)(imgp->image_header + hdr->e_phoff); 476 477 for (i = 0, numsegs = 0; i < hdr->e_phnum; i++) { 478 if (phdr[i].p_type == PT_LOAD) { /* Loadable segment */ 479 prot = 0; 480 if (phdr[i].p_flags & PF_X) 481 prot |= VM_PROT_EXECUTE; 482 if (phdr[i].p_flags & PF_W) 483 prot |= VM_PROT_WRITE; 484 if (phdr[i].p_flags & PF_R) 485 prot |= VM_PROT_READ; 486 487 error = elf_load_section( 488 p, vmspace, imgp->vp, 489 phdr[i].p_offset, 490 (caddr_t)phdr[i].p_vaddr + 491 rbase, 492 phdr[i].p_memsz, 493 phdr[i].p_filesz, prot); 494 if (error != 0) 495 goto fail; 496 /* 497 * Establish the base address if this is the 498 * first segment. 499 */ 500 if (numsegs == 0) 501 base_addr = trunc_page(phdr[i].p_vaddr + rbase); 502 numsegs++; 503 } 504 } 505 *addr = base_addr; 506 *entry=(unsigned long)hdr->e_entry + rbase; 507 508 fail: 509 if (imgp->firstpage) 510 exec_unmap_first_page(imgp); 511 if (imgp->vp) { 512 vrele(imgp->vp); 513 imgp->vp = NULL; 514 } 515 kfree(tempdata, M_TEMP); 516 517 return error; 518 } 519 520 /* 521 * non static, as it can be overridden by start_init() 522 */ 523 int fallback_elf_brand = -1; 524 SYSCTL_INT(_kern, OID_AUTO, fallback_elf_brand, CTLFLAG_RW, 525 &fallback_elf_brand, -1, 526 "ELF brand of last resort"); 527 528 static int 529 exec_elf_imgact(struct image_params *imgp) 530 { 531 const Elf_Ehdr *hdr = (const Elf_Ehdr *) imgp->image_header; 532 const Elf_Phdr *phdr; 533 Elf_Auxargs *elf_auxargs = NULL; 534 struct vmspace *vmspace; 535 vm_prot_t prot; 536 u_long text_size = 0, data_size = 0, total_size = 0; 537 u_long text_addr = 0, data_addr = 0; 538 u_long seg_size, seg_addr; 539 u_long addr, entry = 0, proghdr = 0; 540 int error, i; 541 const char *interp = NULL; 542 const Elf_Note *abi_note = NULL; 543 Elf_Brandinfo *brand_info; 544 char *path; 545 546 error = 0; 547 548 /* 549 * Do we have a valid ELF header ? 550 */ 551 if (elf_check_header(hdr) != 0 || hdr->e_type != ET_EXEC) 552 return -1; 553 554 /* 555 * From here on down, we return an errno, not -1, as we've 556 * detected an ELF file. 557 */ 558 559 if ((hdr->e_phoff > PAGE_SIZE) || 560 (hdr->e_phoff + hdr->e_phentsize * hdr->e_phnum) > PAGE_SIZE) { 561 /* Only support headers in first page for now */ 562 return ENOEXEC; 563 } 564 phdr = (const Elf_Phdr*)(imgp->image_header + hdr->e_phoff); 565 566 /* 567 * From this point on, we may have resources that need to be freed. 568 */ 569 570 exec_new_vmspace(imgp, NULL); 571 572 /* 573 * Yeah, I'm paranoid. There is every reason in the world to get 574 * VTEXT now since from here on out, there are places we can have 575 * a context switch. Better safe than sorry; I really don't want 576 * the file to change while it's being loaded. 577 */ 578 vsetflags(imgp->vp, VTEXT); 579 580 vmspace = imgp->proc->p_vmspace; 581 582 for (i = 0; i < hdr->e_phnum; i++) { 583 switch(phdr[i].p_type) { 584 585 case PT_LOAD: /* Loadable segment */ 586 prot = 0; 587 if (phdr[i].p_flags & PF_X) 588 prot |= VM_PROT_EXECUTE; 589 if (phdr[i].p_flags & PF_W) 590 prot |= VM_PROT_WRITE; 591 if (phdr[i].p_flags & PF_R) 592 prot |= VM_PROT_READ; 593 594 if ((error = elf_load_section(imgp->proc, 595 vmspace, imgp->vp, 596 phdr[i].p_offset, 597 (caddr_t)phdr[i].p_vaddr, 598 phdr[i].p_memsz, 599 phdr[i].p_filesz, prot)) != 0) 600 goto fail; 601 602 /* 603 * If this segment contains the program headers, 604 * remember their virtual address for the AT_PHDR 605 * aux entry. Static binaries don't usually include 606 * a PT_PHDR entry. 607 */ 608 if (phdr[i].p_offset == 0 && 609 hdr->e_phoff + hdr->e_phnum * hdr->e_phentsize 610 <= phdr[i].p_filesz) 611 proghdr = phdr[i].p_vaddr + hdr->e_phoff; 612 613 seg_addr = trunc_page(phdr[i].p_vaddr); 614 seg_size = round_page(phdr[i].p_memsz + 615 phdr[i].p_vaddr - seg_addr); 616 617 /* 618 * Is this .text or .data? We can't use 619 * VM_PROT_WRITE or VM_PROT_EXEC, it breaks the 620 * alpha terribly and possibly does other bad 621 * things so we stick to the old way of figuring 622 * it out: If the segment contains the program 623 * entry point, it's a text segment, otherwise it 624 * is a data segment. 625 * 626 * Note that obreak() assumes that data_addr + 627 * data_size == end of data load area, and the ELF 628 * file format expects segments to be sorted by 629 * address. If multiple data segments exist, the 630 * last one will be used. 631 */ 632 if (hdr->e_entry >= phdr[i].p_vaddr && 633 hdr->e_entry < (phdr[i].p_vaddr + 634 phdr[i].p_memsz)) { 635 text_size = seg_size; 636 text_addr = seg_addr; 637 entry = (u_long)hdr->e_entry; 638 } else { 639 data_size = seg_size; 640 data_addr = seg_addr; 641 } 642 total_size += seg_size; 643 644 /* 645 * Check limits. It should be safe to check the 646 * limits after loading the segment since we do 647 * not actually fault in all the segment's pages. 648 */ 649 if (data_size > 650 imgp->proc->p_rlimit[RLIMIT_DATA].rlim_cur || 651 text_size > maxtsiz || 652 total_size > 653 imgp->proc->p_rlimit[RLIMIT_VMEM].rlim_cur) { 654 error = ENOMEM; 655 goto fail; 656 } 657 break; 658 case PT_INTERP: /* Path to interpreter */ 659 if (phdr[i].p_filesz > MAXPATHLEN || 660 phdr[i].p_offset + phdr[i].p_filesz > PAGE_SIZE) { 661 error = ENOEXEC; 662 goto fail; 663 } 664 interp = imgp->image_header + phdr[i].p_offset; 665 break; 666 case PT_NOTE: /* Check for .note.ABI-tag */ 667 { 668 const Elf_Note *tmp_note; 669 /* XXX handle anything outside the first page */ 670 if (phdr[i].p_offset + phdr[i].p_filesz > PAGE_SIZE) 671 continue; 672 if (phdr[i].p_filesz < sizeof(Elf_Note)) 673 continue; /* ENOEXEC? */ 674 tmp_note = (const Elf_Note *)(imgp->image_header + phdr[i].p_offset); 675 if (tmp_note->n_type != 1) 676 continue; 677 if (tmp_note->n_namesz + sizeof(Elf_Note) + 678 tmp_note->n_descsz > phdr[i].p_filesz) 679 continue; /* ENOEXEC? */ 680 abi_note = tmp_note; 681 } 682 break; 683 case PT_PHDR: /* Program header table info */ 684 proghdr = phdr[i].p_vaddr; 685 break; 686 default: 687 break; 688 } 689 } 690 691 vmspace->vm_tsize = text_size >> PAGE_SHIFT; 692 vmspace->vm_taddr = (caddr_t)(uintptr_t)text_addr; 693 vmspace->vm_dsize = data_size >> PAGE_SHIFT; 694 vmspace->vm_daddr = (caddr_t)(uintptr_t)data_addr; 695 696 addr = ELF_RTLD_ADDR(vmspace); 697 698 imgp->entry_addr = entry; 699 700 brand_info = NULL; 701 702 /* We support three types of branding -- (1) the ELF EI_OSABI field 703 * that SCO added to the ELF spec, (2) FreeBSD 3.x's traditional string 704 * branding w/in the ELF header, and (3) path of the `interp_path' 705 * field. We should also look for an ".note.ABI-tag" ELF section now 706 * in all Linux ELF binaries, FreeBSD 4.1+, and some NetBSD ones. 707 */ 708 709 /* If the executable has a brand, search for it in the brand list. */ 710 if (brand_info == NULL && hdr->e_ident[EI_OSABI] != ELFOSABI_NONE) { 711 for (i = 0; i < MAX_BRANDS; i++) { 712 Elf_Brandinfo *bi = elf_brand_list[i]; 713 714 if (bi != NULL && 715 (hdr->e_ident[EI_OSABI] == bi->brand 716 || 0 == 717 strncmp((const char *)&hdr->e_ident[OLD_EI_BRAND], 718 bi->compat_3_brand, strlen(bi->compat_3_brand)))) { 719 brand_info = bi; 720 break; 721 } 722 } 723 } 724 725 /* Search for a recognized ABI. */ 726 if (brand_info == NULL && abi_note != NULL) { 727 for (i = 0; i < MAX_BRANDS; i++) { 728 Elf_Brandinfo *bi = elf_brand_list[i]; 729 730 if (bi != NULL && bi->match_abi_note != NULL && 731 (*bi->match_abi_note)(abi_note)) { 732 brand_info = bi; 733 break; 734 } 735 } 736 } 737 738 /* 739 * ELFOSABI_NONE == ELFOSABI_SYSV, so a SYSV binary misses all 740 * checks so far, since it is neither branded nor does it have 741 * an ABI note. If the EI_OSABI field is ELFOSABI_NONE, assume 742 * it is svr4 and look for an entry in the elf_brand_list with 743 * match_abi_note == NULL. 744 */ 745 if (brand_info == NULL && hdr->e_ident[EI_OSABI] == ELFOSABI_NONE) { 746 for (i = 0; i < MAX_BRANDS; i++) { 747 Elf_Brandinfo *bi = elf_brand_list[i]; 748 749 if (bi != NULL && bi->match_abi_note == NULL && 750 ELFOSABI_SYSV == bi->brand) { 751 brand_info = bi; 752 break; 753 } 754 } 755 } 756 757 /* Lacking a recognized ABI, search for a recognized interpreter. */ 758 if (brand_info == NULL && interp != NULL) { 759 for (i = 0; i < MAX_BRANDS; i++) { 760 Elf_Brandinfo *bi = elf_brand_list[i]; 761 762 if (bi != NULL && 763 strcmp(interp, bi->interp_path) == 0) { 764 brand_info = bi; 765 break; 766 } 767 } 768 } 769 770 /* Lacking a recognized interpreter, try the default brand */ 771 if (brand_info == NULL) { 772 for (i = 0; i < MAX_BRANDS; i++) { 773 Elf_Brandinfo *bi = elf_brand_list[i]; 774 775 if (bi != NULL && fallback_elf_brand == bi->brand) { 776 brand_info = bi; 777 break; 778 } 779 } 780 } 781 782 if (brand_info == NULL) { 783 uprintf("ELF binary type \"%u\" not known.\n", 784 hdr->e_ident[EI_OSABI]); 785 error = ENOEXEC; 786 goto fail; 787 } 788 789 imgp->proc->p_sysent = brand_info->sysvec; 790 if (interp != NULL) { 791 path = kmalloc(MAXPATHLEN, M_TEMP, M_WAITOK); 792 ksnprintf(path, MAXPATHLEN, "%s%s", 793 brand_info->emul_path, interp); 794 if ((error = elf_load_file(imgp->proc, path, &addr, 795 &imgp->entry_addr)) != 0) { 796 if ((error = elf_load_file(imgp->proc, interp, &addr, 797 &imgp->entry_addr)) != 0) { 798 uprintf("ELF interpreter %s not found\n", path); 799 kfree(path, M_TEMP); 800 goto fail; 801 } 802 } 803 kfree(path, M_TEMP); 804 } else { 805 addr = 0; 806 } 807 808 /* 809 * Construct auxargs table (used by the fixup routine) 810 */ 811 elf_auxargs = kmalloc(sizeof(Elf_Auxargs), M_TEMP, M_WAITOK); 812 elf_auxargs->execfd = -1; 813 elf_auxargs->phdr = proghdr; 814 elf_auxargs->phent = hdr->e_phentsize; 815 elf_auxargs->phnum = hdr->e_phnum; 816 elf_auxargs->pagesz = PAGE_SIZE; 817 elf_auxargs->base = addr; 818 elf_auxargs->flags = 0; 819 elf_auxargs->entry = entry; 820 elf_auxargs->trace = elf_trace; 821 822 imgp->auxargs = elf_auxargs; 823 imgp->interpreted = 0; 824 825 fail: 826 return error; 827 } 828 829 static int 830 elf_freebsd_fixup(register_t **stack_base, struct image_params *imgp) 831 { 832 Elf_Auxargs *args = (Elf_Auxargs *)imgp->auxargs; 833 register_t *pos; 834 835 pos = *stack_base + (imgp->args->argc + imgp->args->envc + 2); 836 837 if (args->trace) { 838 AUXARGS_ENTRY(pos, AT_DEBUG, 1); 839 } 840 if (args->execfd != -1) { 841 AUXARGS_ENTRY(pos, AT_EXECFD, args->execfd); 842 } 843 AUXARGS_ENTRY(pos, AT_PHDR, args->phdr); 844 AUXARGS_ENTRY(pos, AT_PHENT, args->phent); 845 AUXARGS_ENTRY(pos, AT_PHNUM, args->phnum); 846 AUXARGS_ENTRY(pos, AT_PAGESZ, args->pagesz); 847 AUXARGS_ENTRY(pos, AT_FLAGS, args->flags); 848 AUXARGS_ENTRY(pos, AT_ENTRY, args->entry); 849 AUXARGS_ENTRY(pos, AT_BASE, args->base); 850 AUXARGS_ENTRY(pos, AT_NULL, 0); 851 852 kfree(imgp->auxargs, M_TEMP); 853 imgp->auxargs = NULL; 854 855 (*stack_base)--; 856 suword(*stack_base, (long) imgp->args->argc); 857 return 0; 858 } 859 860 /* 861 * Code for generating ELF core dumps. 862 */ 863 864 typedef int (*segment_callback) (vm_map_entry_t, void *); 865 866 /* Closure for cb_put_phdr(). */ 867 struct phdr_closure { 868 Elf_Phdr *phdr; /* Program header to fill in (incremented) */ 869 Elf_Phdr *phdr_max; /* Pointer bound for error check */ 870 Elf_Off offset; /* Offset of segment in core file */ 871 }; 872 873 /* Closure for cb_size_segment(). */ 874 struct sseg_closure { 875 int count; /* Count of writable segments. */ 876 size_t vsize; /* Total size of all writable segments. */ 877 }; 878 879 /* Closure for cb_put_fp(). */ 880 struct fp_closure { 881 struct vn_hdr *vnh; 882 struct vn_hdr *vnh_max; 883 int count; 884 struct stat *sb; 885 }; 886 887 typedef struct elf_buf { 888 char *buf; 889 size_t off; 890 size_t off_max; 891 } *elf_buf_t; 892 893 static void *target_reserve(elf_buf_t target, size_t bytes, int *error); 894 895 static int cb_put_phdr (vm_map_entry_t, void *); 896 static int cb_size_segment (vm_map_entry_t, void *); 897 static int cb_fpcount_segment(vm_map_entry_t, void *); 898 static int cb_put_fp(vm_map_entry_t, void *); 899 900 901 static int each_segment (struct proc *, segment_callback, void *, int); 902 static int elf_corehdr (struct lwp *, int, struct file *, struct ucred *, 903 int, elf_buf_t); 904 enum putmode { WRITE, DRYRUN }; 905 static int elf_puthdr (struct lwp *, elf_buf_t, int sig, enum putmode, 906 int, struct file *); 907 static int elf_putallnotes(struct lwp *, elf_buf_t, int, enum putmode); 908 static int elf_putnote (elf_buf_t, const char *, int, const void *, size_t); 909 910 static int elf_putsigs(struct lwp *, elf_buf_t); 911 static int elf_puttextvp(struct proc *, elf_buf_t); 912 static int elf_putfiles(struct proc *, elf_buf_t, struct file *); 913 914 extern int osreldate; 915 916 int 917 elf_coredump(struct lwp *lp, int sig, struct vnode *vp, off_t limit) 918 { 919 struct file *fp; 920 int error; 921 922 if ((error = falloc(NULL, &fp, NULL)) != 0) 923 return (error); 924 fsetcred(fp, lp->lwp_proc->p_ucred); 925 926 /* 927 * XXX fixme. 928 */ 929 fp->f_type = DTYPE_VNODE; 930 fp->f_flag = O_CREAT|O_WRONLY|O_NOFOLLOW; 931 fp->f_ops = &vnode_fileops; 932 fp->f_data = vp; 933 vn_unlock(vp); 934 935 error = generic_elf_coredump(lp, sig, fp, limit); 936 937 fp->f_type = 0; 938 fp->f_flag = 0; 939 fp->f_ops = &badfileops; 940 fp->f_data = NULL; 941 fdrop(fp); 942 return (error); 943 } 944 945 int 946 generic_elf_coredump(struct lwp *lp, int sig, struct file *fp, off_t limit) 947 { 948 struct proc *p = lp->lwp_proc; 949 struct ucred *cred = p->p_ucred; 950 int error = 0; 951 struct sseg_closure seginfo; 952 struct elf_buf target; 953 954 if (!fp) 955 kprintf("can't dump core - null fp\n"); 956 957 /* 958 * Size the program segments 959 */ 960 seginfo.count = 0; 961 seginfo.vsize = 0; 962 each_segment(p, cb_size_segment, &seginfo, 1); 963 964 /* 965 * Calculate the size of the core file header area by making 966 * a dry run of generating it. Nothing is written, but the 967 * size is calculated. 968 */ 969 bzero(&target, sizeof(target)); 970 elf_puthdr(lp, &target, sig, DRYRUN, seginfo.count, fp); 971 972 if (target.off + seginfo.vsize >= limit) 973 return (EFAULT); 974 975 /* 976 * Allocate memory for building the header, fill it up, 977 * and write it out. 978 */ 979 target.off_max = target.off; 980 target.off = 0; 981 target.buf = kmalloc(target.off_max, M_TEMP, M_WAITOK|M_ZERO); 982 983 error = elf_corehdr(lp, sig, fp, cred, seginfo.count, &target); 984 985 /* Write the contents of all of the writable segments. */ 986 if (error == 0) { 987 Elf_Phdr *php; 988 int i; 989 ssize_t nbytes; 990 991 php = (Elf_Phdr *)(target.buf + sizeof(Elf_Ehdr)) + 1; 992 for (i = 0; i < seginfo.count; i++) { 993 error = fp_write(fp, (caddr_t)php->p_vaddr, 994 php->p_filesz, &nbytes, UIO_USERSPACE); 995 if (error != 0) 996 break; 997 php++; 998 } 999 } 1000 kfree(target.buf, M_TEMP); 1001 1002 return error; 1003 } 1004 1005 /* 1006 * A callback for each_segment() to write out the segment's 1007 * program header entry. 1008 */ 1009 static int 1010 cb_put_phdr(vm_map_entry_t entry, void *closure) 1011 { 1012 struct phdr_closure *phc = closure; 1013 Elf_Phdr *phdr = phc->phdr; 1014 1015 if (phc->phdr == phc->phdr_max) 1016 return EINVAL; 1017 1018 phc->offset = round_page(phc->offset); 1019 1020 phdr->p_type = PT_LOAD; 1021 phdr->p_offset = phc->offset; 1022 phdr->p_vaddr = entry->start; 1023 phdr->p_paddr = 0; 1024 phdr->p_filesz = phdr->p_memsz = entry->end - entry->start; 1025 phdr->p_align = PAGE_SIZE; 1026 phdr->p_flags = 0; 1027 if (entry->protection & VM_PROT_READ) 1028 phdr->p_flags |= PF_R; 1029 if (entry->protection & VM_PROT_WRITE) 1030 phdr->p_flags |= PF_W; 1031 if (entry->protection & VM_PROT_EXECUTE) 1032 phdr->p_flags |= PF_X; 1033 1034 phc->offset += phdr->p_filesz; 1035 ++phc->phdr; 1036 return 0; 1037 } 1038 1039 /* 1040 * A callback for each_writable_segment() to gather information about 1041 * the number of segments and their total size. 1042 */ 1043 static int 1044 cb_size_segment(vm_map_entry_t entry, void *closure) 1045 { 1046 struct sseg_closure *ssc = closure; 1047 1048 ++ssc->count; 1049 ssc->vsize += entry->end - entry->start; 1050 return 0; 1051 } 1052 1053 /* 1054 * A callback for each_segment() to gather information about 1055 * the number of text segments. 1056 */ 1057 static int 1058 cb_fpcount_segment(vm_map_entry_t entry, void *closure) 1059 { 1060 int *count = closure; 1061 struct vnode *vp; 1062 1063 if (entry->object.vm_object->type == OBJT_VNODE) { 1064 vp = (struct vnode *)entry->object.vm_object->handle; 1065 if ((vp->v_flag & VCKPT) && curproc->p_textvp == vp) 1066 return 0; 1067 ++*count; 1068 } 1069 return 0; 1070 } 1071 1072 static int 1073 cb_put_fp(vm_map_entry_t entry, void *closure) 1074 { 1075 struct fp_closure *fpc = closure; 1076 struct vn_hdr *vnh = fpc->vnh; 1077 Elf_Phdr *phdr = &vnh->vnh_phdr; 1078 struct vnode *vp; 1079 int error; 1080 1081 /* 1082 * If an entry represents a vnode then write out a file handle. 1083 * 1084 * If we are checkpointing a checkpoint-restored program we do 1085 * NOT record the filehandle for the old checkpoint vnode (which 1086 * is mapped all over the place). Instead we rely on the fact 1087 * that a checkpoint-restored program does not mmap() the checkpt 1088 * vnode NOCORE, so its contents will be written out to the 1089 * new checkpoint file. This is necessary because the 'old' 1090 * checkpoint file is typically destroyed when a new one is created 1091 * and thus cannot be used to restore the new checkpoint. 1092 * 1093 * Theoretically we could create a chain of checkpoint files and 1094 * operate the checkpointing operation kinda like an incremental 1095 * checkpoint, but a checkpoint restore would then likely wind up 1096 * referencing many prior checkpoint files and that is a bit over 1097 * the top for the purpose of the checkpoint API. 1098 */ 1099 if (entry->object.vm_object->type == OBJT_VNODE) { 1100 vp = (struct vnode *)entry->object.vm_object->handle; 1101 if ((vp->v_flag & VCKPT) && curproc->p_textvp == vp) 1102 return 0; 1103 if (vnh == fpc->vnh_max) 1104 return EINVAL; 1105 1106 if (vp->v_mount) 1107 vnh->vnh_fh.fh_fsid = vp->v_mount->mnt_stat.f_fsid; 1108 error = VFS_VPTOFH(vp, &vnh->vnh_fh.fh_fid); 1109 if (error) { 1110 char *freepath, *fullpath; 1111 1112 if (vn_fullpath(curproc, vp, &fullpath, &freepath)) { 1113 kprintf("Warning: coredump, error %d: cannot store file handle for vnode %p\n", error, vp); 1114 } else { 1115 kprintf("Warning: coredump, error %d: cannot store file handle for %s\n", error, fullpath); 1116 kfree(freepath, M_TEMP); 1117 } 1118 error = 0; 1119 } 1120 1121 phdr->p_type = PT_LOAD; 1122 phdr->p_offset = 0; /* not written to core */ 1123 phdr->p_vaddr = entry->start; 1124 phdr->p_paddr = 0; 1125 phdr->p_filesz = phdr->p_memsz = entry->end - entry->start; 1126 phdr->p_align = PAGE_SIZE; 1127 phdr->p_flags = 0; 1128 if (entry->protection & VM_PROT_READ) 1129 phdr->p_flags |= PF_R; 1130 if (entry->protection & VM_PROT_WRITE) 1131 phdr->p_flags |= PF_W; 1132 if (entry->protection & VM_PROT_EXECUTE) 1133 phdr->p_flags |= PF_X; 1134 ++fpc->vnh; 1135 ++fpc->count; 1136 } 1137 return 0; 1138 } 1139 1140 /* 1141 * For each writable segment in the process's memory map, call the given 1142 * function with a pointer to the map entry and some arbitrary 1143 * caller-supplied data. 1144 */ 1145 static int 1146 each_segment(struct proc *p, segment_callback func, void *closure, int writable) 1147 { 1148 int error = 0; 1149 vm_map_t map = &p->p_vmspace->vm_map; 1150 vm_map_entry_t entry; 1151 1152 for (entry = map->header.next; error == 0 && entry != &map->header; 1153 entry = entry->next) { 1154 vm_object_t obj; 1155 1156 /* 1157 * Don't dump inaccessible mappings, deal with legacy 1158 * coredump mode. 1159 * 1160 * Note that read-only segments related to the elf binary 1161 * are marked MAP_ENTRY_NOCOREDUMP now so we no longer 1162 * need to arbitrarily ignore such segments. 1163 */ 1164 if (elf_legacy_coredump) { 1165 if (writable && (entry->protection & VM_PROT_RW) != VM_PROT_RW) 1166 continue; 1167 } else { 1168 if (writable && (entry->protection & VM_PROT_ALL) == 0) 1169 continue; 1170 } 1171 1172 /* 1173 * Dont include memory segment in the coredump if 1174 * MAP_NOCORE is set in mmap(2) or MADV_NOCORE in 1175 * madvise(2). 1176 * 1177 * Currently we only dump normal VM object maps. We do 1178 * not dump submaps or virtual page tables. 1179 */ 1180 if (writable && (entry->eflags & MAP_ENTRY_NOCOREDUMP)) 1181 continue; 1182 if (entry->maptype != VM_MAPTYPE_NORMAL) 1183 continue; 1184 if ((obj = entry->object.vm_object) == NULL) 1185 continue; 1186 1187 /* Find the deepest backing object. */ 1188 while (obj->backing_object != NULL) 1189 obj = obj->backing_object; 1190 1191 /* Ignore memory-mapped devices and such things. */ 1192 if (obj->type != OBJT_DEFAULT && 1193 obj->type != OBJT_SWAP && 1194 obj->type != OBJT_VNODE) 1195 continue; 1196 1197 error = (*func)(entry, closure); 1198 } 1199 return error; 1200 } 1201 1202 static 1203 void * 1204 target_reserve(elf_buf_t target, size_t bytes, int *error) 1205 { 1206 void *res = NULL; 1207 1208 if (target->buf) { 1209 if (target->off + bytes > target->off_max) 1210 *error = EINVAL; 1211 else 1212 res = target->buf + target->off; 1213 } 1214 target->off += bytes; 1215 return (res); 1216 } 1217 1218 /* 1219 * Write the core file header to the file, including padding up to 1220 * the page boundary. 1221 */ 1222 static int 1223 elf_corehdr(struct lwp *lp, int sig, struct file *fp, struct ucred *cred, 1224 int numsegs, elf_buf_t target) 1225 { 1226 int error; 1227 ssize_t nbytes; 1228 1229 /* 1230 * Fill in the header. The fp is passed so we can detect and flag 1231 * a checkpoint file pointer within the core file itself, because 1232 * it may not be restored from the same file handle. 1233 */ 1234 error = elf_puthdr(lp, target, sig, WRITE, numsegs, fp); 1235 1236 /* Write it to the core file. */ 1237 if (error == 0) { 1238 error = fp_write(fp, target->buf, target->off, &nbytes, 1239 UIO_SYSSPACE); 1240 } 1241 return error; 1242 } 1243 1244 static int 1245 elf_puthdr(struct lwp *lp, elf_buf_t target, int sig, enum putmode mode, 1246 int numsegs, struct file *fp) 1247 { 1248 struct proc *p = lp->lwp_proc; 1249 int error = 0; 1250 size_t phoff; 1251 size_t noteoff; 1252 size_t notesz; 1253 Elf_Ehdr *ehdr; 1254 Elf_Phdr *phdr; 1255 1256 ehdr = target_reserve(target, sizeof(Elf_Ehdr), &error); 1257 1258 phoff = target->off; 1259 phdr = target_reserve(target, (numsegs + 1) * sizeof(Elf_Phdr), &error); 1260 1261 noteoff = target->off; 1262 if (error == 0) 1263 elf_putallnotes(lp, target, sig, mode); 1264 notesz = target->off - noteoff; 1265 1266 /* 1267 * put extra cruft for dumping process state here 1268 * - we really want it be before all the program 1269 * mappings 1270 * - we just need to update the offset accordingly 1271 * and GDB will be none the wiser. 1272 */ 1273 if (error == 0) 1274 error = elf_puttextvp(p, target); 1275 if (error == 0) 1276 error = elf_putsigs(lp, target); 1277 if (error == 0) 1278 error = elf_putfiles(p, target, fp); 1279 1280 /* 1281 * Align up to a page boundary for the program segments. The 1282 * actual data will be written to the outptu file, not to elf_buf_t, 1283 * so we do not have to do any further bounds checking. 1284 */ 1285 target->off = round_page(target->off); 1286 if (error == 0 && ehdr != NULL) { 1287 /* 1288 * Fill in the ELF header. 1289 */ 1290 ehdr->e_ident[EI_MAG0] = ELFMAG0; 1291 ehdr->e_ident[EI_MAG1] = ELFMAG1; 1292 ehdr->e_ident[EI_MAG2] = ELFMAG2; 1293 ehdr->e_ident[EI_MAG3] = ELFMAG3; 1294 ehdr->e_ident[EI_CLASS] = ELF_CLASS; 1295 ehdr->e_ident[EI_DATA] = ELF_DATA; 1296 ehdr->e_ident[EI_VERSION] = EV_CURRENT; 1297 ehdr->e_ident[EI_OSABI] = ELFOSABI_FREEBSD; 1298 ehdr->e_ident[EI_ABIVERSION] = 0; 1299 ehdr->e_ident[EI_PAD] = 0; 1300 ehdr->e_type = ET_CORE; 1301 ehdr->e_machine = ELF_ARCH; 1302 ehdr->e_version = EV_CURRENT; 1303 ehdr->e_entry = 0; 1304 ehdr->e_phoff = phoff; 1305 ehdr->e_flags = 0; 1306 ehdr->e_ehsize = sizeof(Elf_Ehdr); 1307 ehdr->e_phentsize = sizeof(Elf_Phdr); 1308 ehdr->e_phnum = numsegs + 1; 1309 ehdr->e_shentsize = sizeof(Elf_Shdr); 1310 ehdr->e_shnum = 0; 1311 ehdr->e_shstrndx = SHN_UNDEF; 1312 } 1313 if (error == 0 && phdr != NULL) { 1314 /* 1315 * Fill in the program header entries. 1316 */ 1317 struct phdr_closure phc; 1318 1319 /* The note segement. */ 1320 phdr->p_type = PT_NOTE; 1321 phdr->p_offset = noteoff; 1322 phdr->p_vaddr = 0; 1323 phdr->p_paddr = 0; 1324 phdr->p_filesz = notesz; 1325 phdr->p_memsz = 0; 1326 phdr->p_flags = 0; 1327 phdr->p_align = 0; 1328 ++phdr; 1329 1330 /* All the writable segments from the program. */ 1331 phc.phdr = phdr; 1332 phc.phdr_max = phdr + numsegs; 1333 phc.offset = target->off; 1334 each_segment(p, cb_put_phdr, &phc, 1); 1335 } 1336 return (error); 1337 } 1338 1339 /* 1340 * Append core dump notes to target ELF buffer or simply update target size 1341 * if dryrun selected. 1342 */ 1343 static int 1344 elf_putallnotes(struct lwp *corelp, elf_buf_t target, int sig, 1345 enum putmode mode) 1346 { 1347 struct proc *p = corelp->lwp_proc; 1348 int error; 1349 struct { 1350 prstatus_t status; 1351 prfpregset_t fpregs; 1352 prpsinfo_t psinfo; 1353 } *tmpdata; 1354 prstatus_t *status; 1355 prfpregset_t *fpregs; 1356 prpsinfo_t *psinfo; 1357 struct lwp *lp; 1358 1359 /* 1360 * Allocate temporary storage for notes on heap to avoid stack overflow. 1361 */ 1362 if (mode != DRYRUN) { 1363 tmpdata = kmalloc(sizeof(*tmpdata), M_TEMP, M_ZERO | M_WAITOK); 1364 status = &tmpdata->status; 1365 fpregs = &tmpdata->fpregs; 1366 psinfo = &tmpdata->psinfo; 1367 } else { 1368 tmpdata = NULL; 1369 status = NULL; 1370 fpregs = NULL; 1371 psinfo = NULL; 1372 } 1373 1374 /* 1375 * Append LWP-agnostic note. 1376 */ 1377 if (mode != DRYRUN) { 1378 psinfo->pr_version = PRPSINFO_VERSION; 1379 psinfo->pr_psinfosz = sizeof(prpsinfo_t); 1380 strncpy(psinfo->pr_fname, p->p_comm, 1381 sizeof(psinfo->pr_fname) - 1); 1382 /* 1383 * XXX - We don't fill in the command line arguments 1384 * properly yet. 1385 */ 1386 strncpy(psinfo->pr_psargs, p->p_comm, PRARGSZ); 1387 } 1388 error = 1389 elf_putnote(target, "FreeBSD", NT_PRPSINFO, psinfo, sizeof *psinfo); 1390 if (error) 1391 goto exit; 1392 1393 /* 1394 * Append first note for LWP that triggered core so that it is 1395 * the selected one when the debugger starts. 1396 */ 1397 if (mode != DRYRUN) { 1398 status->pr_version = PRSTATUS_VERSION; 1399 status->pr_statussz = sizeof(prstatus_t); 1400 status->pr_gregsetsz = sizeof(gregset_t); 1401 status->pr_fpregsetsz = sizeof(fpregset_t); 1402 status->pr_osreldate = osreldate; 1403 status->pr_cursig = sig; 1404 /* 1405 * XXX GDB needs unique pr_pid for each LWP and does not 1406 * not support pr_pid==0 but lwp_tid can be 0, so hack unique 1407 * value. 1408 */ 1409 status->pr_pid = p->p_pid + corelp->lwp_tid; 1410 fill_regs(corelp, &status->pr_reg); 1411 fill_fpregs(corelp, fpregs); 1412 } 1413 error = 1414 elf_putnote(target, "FreeBSD", NT_PRSTATUS, status, sizeof *status); 1415 if (error) 1416 goto exit; 1417 error = 1418 elf_putnote(target, "FreeBSD", NT_FPREGSET, fpregs, sizeof *fpregs); 1419 if (error) 1420 goto exit; 1421 1422 /* 1423 * Then append notes for other LWPs. 1424 */ 1425 FOREACH_LWP_IN_PROC(lp, p) { 1426 if (lp == corelp) 1427 continue; 1428 /* skip lwps being created */ 1429 if (lp->lwp_thread == NULL) 1430 continue; 1431 if (mode != DRYRUN) { 1432 status->pr_pid = p->p_pid + lp->lwp_tid; 1433 fill_regs(lp, &status->pr_reg); 1434 fill_fpregs(lp, fpregs); 1435 } 1436 error = elf_putnote(target, "FreeBSD", NT_PRSTATUS, 1437 status, sizeof *status); 1438 if (error) 1439 goto exit; 1440 error = elf_putnote(target, "FreeBSD", NT_FPREGSET, 1441 fpregs, sizeof *fpregs); 1442 if (error) 1443 goto exit; 1444 } 1445 1446 exit: 1447 if (tmpdata != NULL) 1448 kfree(tmpdata, M_TEMP); 1449 return (error); 1450 } 1451 1452 static int 1453 elf_putnote(elf_buf_t target, const char *name, int type, 1454 const void *desc, size_t descsz) 1455 { 1456 int error = 0; 1457 char *dst; 1458 Elf_Note note; 1459 1460 note.n_namesz = strlen(name) + 1; 1461 note.n_descsz = descsz; 1462 note.n_type = type; 1463 dst = target_reserve(target, sizeof(note), &error); 1464 if (dst != NULL) 1465 bcopy(¬e, dst, sizeof note); 1466 dst = target_reserve(target, note.n_namesz, &error); 1467 if (dst != NULL) 1468 bcopy(name, dst, note.n_namesz); 1469 target->off = roundup2(target->off, sizeof(Elf_Size)); 1470 dst = target_reserve(target, note.n_descsz, &error); 1471 if (dst != NULL) 1472 bcopy(desc, dst, note.n_descsz); 1473 target->off = roundup2(target->off, sizeof(Elf_Size)); 1474 return(error); 1475 } 1476 1477 1478 static int 1479 elf_putsigs(struct lwp *lp, elf_buf_t target) 1480 { 1481 /* XXX lwp handle more than one lwp */ 1482 struct proc *p = lp->lwp_proc; 1483 int error = 0; 1484 struct ckpt_siginfo *csi; 1485 1486 csi = target_reserve(target, sizeof(struct ckpt_siginfo), &error); 1487 if (csi) { 1488 csi->csi_ckptpisz = sizeof(struct ckpt_siginfo); 1489 bcopy(p->p_sigacts, &csi->csi_sigacts, sizeof(*p->p_sigacts)); 1490 bcopy(&p->p_realtimer, &csi->csi_itimerval, sizeof(struct itimerval)); 1491 bcopy(&lp->lwp_sigmask, &csi->csi_sigmask, 1492 sizeof(sigset_t)); 1493 csi->csi_sigparent = p->p_sigparent; 1494 } 1495 return(error); 1496 } 1497 1498 static int 1499 elf_putfiles(struct proc *p, elf_buf_t target, struct file *ckfp) 1500 { 1501 int error = 0; 1502 int i; 1503 struct ckpt_filehdr *cfh = NULL; 1504 struct ckpt_fileinfo *cfi; 1505 struct file *fp; 1506 struct vnode *vp; 1507 /* 1508 * the duplicated loop is gross, but it was the only way 1509 * to eliminate uninitialized variable warnings 1510 */ 1511 cfh = target_reserve(target, sizeof(struct ckpt_filehdr), &error); 1512 if (cfh) { 1513 cfh->cfh_nfiles = 0; 1514 } 1515 1516 /* 1517 * ignore STDIN/STDERR/STDOUT. 1518 */ 1519 for (i = 3; error == 0 && i < p->p_fd->fd_nfiles; i++) { 1520 fp = holdfp(p->p_fd, i, -1); 1521 if (fp == NULL) 1522 continue; 1523 /* 1524 * XXX Only checkpoint vnodes for now. 1525 */ 1526 if (fp->f_type != DTYPE_VNODE) { 1527 fdrop(fp); 1528 continue; 1529 } 1530 cfi = target_reserve(target, sizeof(struct ckpt_fileinfo), 1531 &error); 1532 if (cfi == NULL) { 1533 fdrop(fp); 1534 continue; 1535 } 1536 cfi->cfi_index = -1; 1537 cfi->cfi_type = fp->f_type; 1538 cfi->cfi_flags = fp->f_flag; 1539 cfi->cfi_offset = fp->f_offset; 1540 cfi->cfi_ckflags = 0; 1541 1542 if (fp == ckfp) 1543 cfi->cfi_ckflags |= CKFIF_ISCKPTFD; 1544 /* f_count and f_msgcount should not be saved/restored */ 1545 /* XXX save cred info */ 1546 1547 switch(fp->f_type) { 1548 case DTYPE_VNODE: 1549 vp = (struct vnode *)fp->f_data; 1550 /* 1551 * it looks like a bug in ptrace is marking 1552 * a non-vnode as a vnode - until we find the 1553 * root cause this will at least prevent 1554 * further panics from truss 1555 */ 1556 if (vp == NULL || vp->v_mount == NULL) 1557 break; 1558 cfh->cfh_nfiles++; 1559 cfi->cfi_index = i; 1560 cfi->cfi_fh.fh_fsid = vp->v_mount->mnt_stat.f_fsid; 1561 error = VFS_VPTOFH(vp, &cfi->cfi_fh.fh_fid); 1562 break; 1563 default: 1564 break; 1565 } 1566 fdrop(fp); 1567 } 1568 return(error); 1569 } 1570 1571 static int 1572 elf_puttextvp(struct proc *p, elf_buf_t target) 1573 { 1574 int error = 0; 1575 int *vn_count; 1576 struct fp_closure fpc; 1577 struct ckpt_vminfo *vminfo; 1578 1579 vminfo = target_reserve(target, sizeof(struct ckpt_vminfo), &error); 1580 if (vminfo != NULL) { 1581 vminfo->cvm_dsize = p->p_vmspace->vm_dsize; 1582 vminfo->cvm_tsize = p->p_vmspace->vm_tsize; 1583 vminfo->cvm_daddr = p->p_vmspace->vm_daddr; 1584 vminfo->cvm_taddr = p->p_vmspace->vm_taddr; 1585 } 1586 1587 fpc.count = 0; 1588 vn_count = target_reserve(target, sizeof(int), &error); 1589 if (target->buf != NULL) { 1590 fpc.vnh = (struct vn_hdr *)(target->buf + target->off); 1591 fpc.vnh_max = fpc.vnh + 1592 (target->off_max - target->off) / sizeof(struct vn_hdr); 1593 error = each_segment(p, cb_put_fp, &fpc, 0); 1594 if (vn_count) 1595 *vn_count = fpc.count; 1596 } else { 1597 error = each_segment(p, cb_fpcount_segment, &fpc.count, 0); 1598 } 1599 target->off += fpc.count * sizeof(struct vn_hdr); 1600 return(error); 1601 } 1602 1603 1604 /* 1605 * Tell kern_execve.c about it, with a little help from the linker. 1606 */ 1607 static struct execsw elf_execsw = {exec_elf_imgact, "ELF"}; 1608 EXEC_SET_ORDERED(elf, elf_execsw, SI_ORDER_FIRST); 1609