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 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 can_exec_dyn = 1; 529 SYSCTL_INT(_kern, OID_AUTO, elf_exec_dyn, CTLFLAG_RW, 530 &can_exec_dyn, 1, 531 "ELF: can exec shared libraries"); 532 533 static int 534 exec_elf_imgact(struct image_params *imgp) 535 { 536 const Elf_Ehdr *hdr = (const Elf_Ehdr *) imgp->image_header; 537 const Elf_Phdr *phdr; 538 Elf_Auxargs *elf_auxargs = NULL; 539 struct vmspace *vmspace; 540 vm_prot_t prot; 541 u_long text_size = 0, data_size = 0, total_size = 0; 542 u_long text_addr = 0, data_addr = 0; 543 u_long seg_size, seg_addr; 544 u_long addr, entry = 0, proghdr = 0; 545 int error, i; 546 const char *interp = NULL; 547 const Elf_Note *abi_note = NULL; 548 Elf_Brandinfo *brand_info; 549 char *path; 550 551 error = 0; 552 553 /* 554 * Do we have a valid ELF header ? 555 * We allow execution of ET_EXEC and, if kern.elf_exec_dyn is 1, ET_DYN. 556 */ 557 if (elf_check_header(hdr) != 0 || 558 (hdr->e_type != ET_EXEC && (!can_exec_dyn || hdr->e_type != ET_DYN))) 559 return -1; 560 561 /* 562 * From here on down, we return an errno, not -1, as we've 563 * detected an ELF file. 564 */ 565 566 if ((hdr->e_phoff > PAGE_SIZE) || 567 (hdr->e_phoff + hdr->e_phentsize * hdr->e_phnum) > PAGE_SIZE) { 568 /* Only support headers in first page for now */ 569 return ENOEXEC; 570 } 571 phdr = (const Elf_Phdr*)(imgp->image_header + hdr->e_phoff); 572 573 /* 574 * From this point on, we may have resources that need to be freed. 575 */ 576 577 exec_new_vmspace(imgp, NULL); 578 579 /* 580 * Yeah, I'm paranoid. There is every reason in the world to get 581 * VTEXT now since from here on out, there are places we can have 582 * a context switch. Better safe than sorry; I really don't want 583 * the file to change while it's being loaded. 584 */ 585 vsetflags(imgp->vp, VTEXT); 586 587 vmspace = imgp->proc->p_vmspace; 588 589 for (i = 0; i < hdr->e_phnum; i++) { 590 switch(phdr[i].p_type) { 591 592 case PT_LOAD: /* Loadable segment */ 593 prot = 0; 594 if (phdr[i].p_flags & PF_X) 595 prot |= VM_PROT_EXECUTE; 596 if (phdr[i].p_flags & PF_W) 597 prot |= VM_PROT_WRITE; 598 if (phdr[i].p_flags & PF_R) 599 prot |= VM_PROT_READ; 600 601 if ((error = elf_load_section(imgp->proc, 602 vmspace, imgp->vp, 603 phdr[i].p_offset, 604 (caddr_t)phdr[i].p_vaddr, 605 phdr[i].p_memsz, 606 phdr[i].p_filesz, prot)) != 0) 607 goto fail; 608 609 /* 610 * If this segment contains the program headers, 611 * remember their virtual address for the AT_PHDR 612 * aux entry. Static binaries don't usually include 613 * a PT_PHDR entry. 614 */ 615 if (phdr[i].p_offset == 0 && 616 hdr->e_phoff + hdr->e_phnum * hdr->e_phentsize 617 <= phdr[i].p_filesz) 618 proghdr = phdr[i].p_vaddr + hdr->e_phoff; 619 620 seg_addr = trunc_page(phdr[i].p_vaddr); 621 seg_size = round_page(phdr[i].p_memsz + 622 phdr[i].p_vaddr - seg_addr); 623 624 /* 625 * Is this .text or .data? We can't use 626 * VM_PROT_WRITE or VM_PROT_EXEC, it breaks the 627 * alpha terribly and possibly does other bad 628 * things so we stick to the old way of figuring 629 * it out: If the segment contains the program 630 * entry point, it's a text segment, otherwise it 631 * is a data segment. 632 * 633 * Note that obreak() assumes that data_addr + 634 * data_size == end of data load area, and the ELF 635 * file format expects segments to be sorted by 636 * address. If multiple data segments exist, the 637 * last one will be used. 638 */ 639 if (hdr->e_entry >= phdr[i].p_vaddr && 640 hdr->e_entry < (phdr[i].p_vaddr + 641 phdr[i].p_memsz)) { 642 text_size = seg_size; 643 text_addr = seg_addr; 644 entry = (u_long)hdr->e_entry; 645 } else { 646 data_size = seg_size; 647 data_addr = seg_addr; 648 } 649 total_size += seg_size; 650 651 /* 652 * Check limits. It should be safe to check the 653 * limits after loading the segment since we do 654 * not actually fault in all the segment's pages. 655 */ 656 if (data_size > 657 imgp->proc->p_rlimit[RLIMIT_DATA].rlim_cur || 658 text_size > maxtsiz || 659 total_size > 660 imgp->proc->p_rlimit[RLIMIT_VMEM].rlim_cur) { 661 error = ENOMEM; 662 goto fail; 663 } 664 break; 665 case PT_INTERP: /* Path to interpreter */ 666 if (phdr[i].p_filesz > MAXPATHLEN || 667 phdr[i].p_offset + phdr[i].p_filesz > PAGE_SIZE) { 668 error = ENOEXEC; 669 goto fail; 670 } 671 interp = imgp->image_header + phdr[i].p_offset; 672 break; 673 case PT_NOTE: /* Check for .note.ABI-tag */ 674 { 675 const Elf_Note *tmp_note; 676 /* XXX handle anything outside the first page */ 677 if (phdr[i].p_offset + phdr[i].p_filesz > PAGE_SIZE) 678 continue; 679 if (phdr[i].p_filesz < sizeof(Elf_Note)) 680 continue; /* ENOEXEC? */ 681 tmp_note = (const Elf_Note *)(imgp->image_header + phdr[i].p_offset); 682 if (tmp_note->n_type != 1) 683 continue; 684 if (tmp_note->n_namesz + sizeof(Elf_Note) + 685 tmp_note->n_descsz > phdr[i].p_filesz) 686 continue; /* ENOEXEC? */ 687 abi_note = tmp_note; 688 } 689 break; 690 case PT_PHDR: /* Program header table info */ 691 proghdr = phdr[i].p_vaddr; 692 break; 693 default: 694 break; 695 } 696 } 697 698 vmspace->vm_tsize = text_size >> PAGE_SHIFT; 699 vmspace->vm_taddr = (caddr_t)(uintptr_t)text_addr; 700 vmspace->vm_dsize = data_size >> PAGE_SHIFT; 701 vmspace->vm_daddr = (caddr_t)(uintptr_t)data_addr; 702 703 addr = ELF_RTLD_ADDR(vmspace); 704 705 imgp->entry_addr = entry; 706 707 brand_info = NULL; 708 709 /* We support three types of branding -- (1) the ELF EI_OSABI field 710 * that SCO added to the ELF spec, (2) FreeBSD 3.x's traditional string 711 * branding w/in the ELF header, and (3) path of the `interp_path' 712 * field. We should also look for an ".note.ABI-tag" ELF section now 713 * in all Linux ELF binaries, FreeBSD 4.1+, and some NetBSD ones. 714 */ 715 716 /* If the executable has a brand, search for it in the brand list. */ 717 if (brand_info == NULL && hdr->e_ident[EI_OSABI] != ELFOSABI_NONE) { 718 for (i = 0; i < MAX_BRANDS; i++) { 719 Elf_Brandinfo *bi = elf_brand_list[i]; 720 721 if (bi != NULL && 722 (hdr->e_ident[EI_OSABI] == bi->brand 723 || 0 == 724 strncmp((const char *)&hdr->e_ident[OLD_EI_BRAND], 725 bi->compat_3_brand, strlen(bi->compat_3_brand)))) { 726 brand_info = bi; 727 break; 728 } 729 } 730 } 731 732 /* Search for a recognized ABI. */ 733 if (brand_info == NULL && abi_note != NULL) { 734 for (i = 0; i < MAX_BRANDS; i++) { 735 Elf_Brandinfo *bi = elf_brand_list[i]; 736 737 if (bi != NULL && bi->match_abi_note != NULL && 738 (*bi->match_abi_note)(abi_note)) { 739 brand_info = bi; 740 break; 741 } 742 } 743 } 744 745 /* 746 * ELFOSABI_NONE == ELFOSABI_SYSV, so a SYSV binary misses all 747 * checks so far, since it is neither branded nor does it have 748 * an ABI note. If the EI_OSABI field is ELFOSABI_NONE, assume 749 * it is svr4 and look for an entry in the elf_brand_list with 750 * match_abi_note == NULL. 751 */ 752 if (brand_info == NULL && hdr->e_ident[EI_OSABI] == ELFOSABI_NONE) { 753 for (i = 0; i < MAX_BRANDS; i++) { 754 Elf_Brandinfo *bi = elf_brand_list[i]; 755 756 if (bi != NULL && bi->match_abi_note == NULL && 757 ELFOSABI_SYSV == bi->brand) { 758 brand_info = bi; 759 break; 760 } 761 } 762 } 763 764 /* Lacking a recognized ABI, search for a recognized interpreter. */ 765 if (brand_info == NULL && interp != NULL) { 766 for (i = 0; i < MAX_BRANDS; i++) { 767 Elf_Brandinfo *bi = elf_brand_list[i]; 768 769 if (bi != NULL && 770 strcmp(interp, bi->interp_path) == 0) { 771 brand_info = bi; 772 break; 773 } 774 } 775 } 776 777 /* Lacking a recognized interpreter, try the default brand */ 778 if (brand_info == NULL) { 779 for (i = 0; i < MAX_BRANDS; i++) { 780 Elf_Brandinfo *bi = elf_brand_list[i]; 781 782 if (bi != NULL && fallback_elf_brand == bi->brand) { 783 brand_info = bi; 784 break; 785 } 786 } 787 } 788 789 if (brand_info == NULL) { 790 uprintf("ELF binary type \"%u\" not known.\n", 791 hdr->e_ident[EI_OSABI]); 792 error = ENOEXEC; 793 goto fail; 794 } 795 796 imgp->proc->p_sysent = brand_info->sysvec; 797 if (interp != NULL) { 798 path = kmalloc(MAXPATHLEN, M_TEMP, M_WAITOK); 799 ksnprintf(path, MAXPATHLEN, "%s%s", 800 brand_info->emul_path, interp); 801 if ((error = elf_load_file(imgp->proc, path, &addr, 802 &imgp->entry_addr)) != 0) { 803 if ((error = elf_load_file(imgp->proc, interp, &addr, 804 &imgp->entry_addr)) != 0) { 805 uprintf("ELF interpreter %s not found\n", path); 806 kfree(path, M_TEMP); 807 goto fail; 808 } 809 } 810 kfree(path, M_TEMP); 811 } else { 812 addr = 0; 813 } 814 815 /* 816 * Construct auxargs table (used by the fixup routine) 817 */ 818 elf_auxargs = kmalloc(sizeof(Elf_Auxargs), M_TEMP, M_WAITOK); 819 elf_auxargs->execfd = -1; 820 elf_auxargs->phdr = proghdr; 821 elf_auxargs->phent = hdr->e_phentsize; 822 elf_auxargs->phnum = hdr->e_phnum; 823 elf_auxargs->pagesz = PAGE_SIZE; 824 elf_auxargs->base = addr; 825 elf_auxargs->flags = 0; 826 elf_auxargs->entry = entry; 827 elf_auxargs->trace = elf_trace; 828 829 imgp->auxargs = elf_auxargs; 830 imgp->interpreted = 0; 831 832 fail: 833 return error; 834 } 835 836 static int 837 elf_freebsd_fixup(register_t **stack_base, struct image_params *imgp) 838 { 839 Elf_Auxargs *args = (Elf_Auxargs *)imgp->auxargs; 840 register_t *pos; 841 842 pos = *stack_base + (imgp->args->argc + imgp->args->envc + 2); 843 844 if (args->trace) { 845 AUXARGS_ENTRY(pos, AT_DEBUG, 1); 846 } 847 if (args->execfd != -1) { 848 AUXARGS_ENTRY(pos, AT_EXECFD, args->execfd); 849 } 850 AUXARGS_ENTRY(pos, AT_PHDR, args->phdr); 851 AUXARGS_ENTRY(pos, AT_PHENT, args->phent); 852 AUXARGS_ENTRY(pos, AT_PHNUM, args->phnum); 853 AUXARGS_ENTRY(pos, AT_PAGESZ, args->pagesz); 854 AUXARGS_ENTRY(pos, AT_FLAGS, args->flags); 855 AUXARGS_ENTRY(pos, AT_ENTRY, args->entry); 856 AUXARGS_ENTRY(pos, AT_BASE, args->base); 857 AUXARGS_ENTRY(pos, AT_NULL, 0); 858 859 kfree(imgp->auxargs, M_TEMP); 860 imgp->auxargs = NULL; 861 862 (*stack_base)--; 863 suword(*stack_base, (long) imgp->args->argc); 864 return 0; 865 } 866 867 /* 868 * Code for generating ELF core dumps. 869 */ 870 871 typedef int (*segment_callback) (vm_map_entry_t, void *); 872 873 /* Closure for cb_put_phdr(). */ 874 struct phdr_closure { 875 Elf_Phdr *phdr; /* Program header to fill in (incremented) */ 876 Elf_Phdr *phdr_max; /* Pointer bound for error check */ 877 Elf_Off offset; /* Offset of segment in core file */ 878 }; 879 880 /* Closure for cb_size_segment(). */ 881 struct sseg_closure { 882 int count; /* Count of writable segments. */ 883 size_t vsize; /* Total size of all writable segments. */ 884 }; 885 886 /* Closure for cb_put_fp(). */ 887 struct fp_closure { 888 struct vn_hdr *vnh; 889 struct vn_hdr *vnh_max; 890 int count; 891 struct stat *sb; 892 }; 893 894 typedef struct elf_buf { 895 char *buf; 896 size_t off; 897 size_t off_max; 898 } *elf_buf_t; 899 900 static void *target_reserve(elf_buf_t target, size_t bytes, int *error); 901 902 static int cb_put_phdr (vm_map_entry_t, void *); 903 static int cb_size_segment (vm_map_entry_t, void *); 904 static int cb_fpcount_segment(vm_map_entry_t, void *); 905 static int cb_put_fp(vm_map_entry_t, void *); 906 907 908 static int each_segment (struct proc *, segment_callback, void *, int); 909 static int elf_corehdr (struct lwp *, int, struct file *, struct ucred *, 910 int, elf_buf_t); 911 enum putmode { WRITE, DRYRUN }; 912 static int elf_puthdr (struct lwp *, elf_buf_t, int sig, enum putmode, 913 int, struct file *); 914 static int elf_putallnotes(struct lwp *, elf_buf_t, int, enum putmode); 915 static int elf_putnote (elf_buf_t, const char *, int, const void *, size_t); 916 917 static int elf_putsigs(struct lwp *, elf_buf_t); 918 static int elf_puttextvp(struct proc *, elf_buf_t); 919 static int elf_putfiles(struct proc *, elf_buf_t, struct file *); 920 921 extern int osreldate; 922 923 int 924 elf_coredump(struct lwp *lp, int sig, struct vnode *vp, off_t limit) 925 { 926 struct file *fp; 927 int error; 928 929 if ((error = falloc(NULL, &fp, NULL)) != 0) 930 return (error); 931 fsetcred(fp, lp->lwp_proc->p_ucred); 932 933 /* 934 * XXX fixme. 935 */ 936 fp->f_type = DTYPE_VNODE; 937 fp->f_flag = O_CREAT|O_WRONLY|O_NOFOLLOW; 938 fp->f_ops = &vnode_fileops; 939 fp->f_data = vp; 940 vn_unlock(vp); 941 942 error = generic_elf_coredump(lp, sig, fp, limit); 943 944 fp->f_type = 0; 945 fp->f_flag = 0; 946 fp->f_ops = &badfileops; 947 fp->f_data = NULL; 948 fdrop(fp); 949 return (error); 950 } 951 952 int 953 generic_elf_coredump(struct lwp *lp, int sig, struct file *fp, off_t limit) 954 { 955 struct proc *p = lp->lwp_proc; 956 struct ucred *cred = p->p_ucred; 957 int error = 0; 958 struct sseg_closure seginfo; 959 struct elf_buf target; 960 961 if (!fp) 962 kprintf("can't dump core - null fp\n"); 963 964 /* 965 * Size the program segments 966 */ 967 seginfo.count = 0; 968 seginfo.vsize = 0; 969 each_segment(p, cb_size_segment, &seginfo, 1); 970 971 /* 972 * Calculate the size of the core file header area by making 973 * a dry run of generating it. Nothing is written, but the 974 * size is calculated. 975 */ 976 bzero(&target, sizeof(target)); 977 elf_puthdr(lp, &target, sig, DRYRUN, seginfo.count, fp); 978 979 if (target.off + seginfo.vsize >= limit) 980 return (EFAULT); 981 982 /* 983 * Allocate memory for building the header, fill it up, 984 * and write it out. 985 */ 986 target.off_max = target.off; 987 target.off = 0; 988 target.buf = kmalloc(target.off_max, M_TEMP, M_WAITOK|M_ZERO); 989 990 error = elf_corehdr(lp, sig, fp, cred, seginfo.count, &target); 991 992 /* Write the contents of all of the writable segments. */ 993 if (error == 0) { 994 Elf_Phdr *php; 995 int i; 996 ssize_t nbytes; 997 998 php = (Elf_Phdr *)(target.buf + sizeof(Elf_Ehdr)) + 1; 999 for (i = 0; i < seginfo.count; i++) { 1000 error = fp_write(fp, (caddr_t)php->p_vaddr, 1001 php->p_filesz, &nbytes, UIO_USERSPACE); 1002 if (error != 0) 1003 break; 1004 php++; 1005 } 1006 } 1007 kfree(target.buf, M_TEMP); 1008 1009 return error; 1010 } 1011 1012 /* 1013 * A callback for each_segment() to write out the segment's 1014 * program header entry. 1015 */ 1016 static int 1017 cb_put_phdr(vm_map_entry_t entry, void *closure) 1018 { 1019 struct phdr_closure *phc = closure; 1020 Elf_Phdr *phdr = phc->phdr; 1021 1022 if (phc->phdr == phc->phdr_max) 1023 return EINVAL; 1024 1025 phc->offset = round_page(phc->offset); 1026 1027 phdr->p_type = PT_LOAD; 1028 phdr->p_offset = phc->offset; 1029 phdr->p_vaddr = entry->start; 1030 phdr->p_paddr = 0; 1031 phdr->p_filesz = phdr->p_memsz = entry->end - entry->start; 1032 phdr->p_align = PAGE_SIZE; 1033 phdr->p_flags = 0; 1034 if (entry->protection & VM_PROT_READ) 1035 phdr->p_flags |= PF_R; 1036 if (entry->protection & VM_PROT_WRITE) 1037 phdr->p_flags |= PF_W; 1038 if (entry->protection & VM_PROT_EXECUTE) 1039 phdr->p_flags |= PF_X; 1040 1041 phc->offset += phdr->p_filesz; 1042 ++phc->phdr; 1043 return 0; 1044 } 1045 1046 /* 1047 * A callback for each_writable_segment() to gather information about 1048 * the number of segments and their total size. 1049 */ 1050 static int 1051 cb_size_segment(vm_map_entry_t entry, void *closure) 1052 { 1053 struct sseg_closure *ssc = closure; 1054 1055 ++ssc->count; 1056 ssc->vsize += entry->end - entry->start; 1057 return 0; 1058 } 1059 1060 /* 1061 * A callback for each_segment() to gather information about 1062 * the number of text segments. 1063 */ 1064 static int 1065 cb_fpcount_segment(vm_map_entry_t entry, void *closure) 1066 { 1067 int *count = closure; 1068 struct vnode *vp; 1069 1070 if (entry->object.vm_object->type == OBJT_VNODE) { 1071 vp = (struct vnode *)entry->object.vm_object->handle; 1072 if ((vp->v_flag & VCKPT) && curproc->p_textvp == vp) 1073 return 0; 1074 ++*count; 1075 } 1076 return 0; 1077 } 1078 1079 static int 1080 cb_put_fp(vm_map_entry_t entry, void *closure) 1081 { 1082 struct fp_closure *fpc = closure; 1083 struct vn_hdr *vnh = fpc->vnh; 1084 Elf_Phdr *phdr = &vnh->vnh_phdr; 1085 struct vnode *vp; 1086 int error; 1087 1088 /* 1089 * If an entry represents a vnode then write out a file handle. 1090 * 1091 * If we are checkpointing a checkpoint-restored program we do 1092 * NOT record the filehandle for the old checkpoint vnode (which 1093 * is mapped all over the place). Instead we rely on the fact 1094 * that a checkpoint-restored program does not mmap() the checkpt 1095 * vnode NOCORE, so its contents will be written out to the 1096 * new checkpoint file. This is necessary because the 'old' 1097 * checkpoint file is typically destroyed when a new one is created 1098 * and thus cannot be used to restore the new checkpoint. 1099 * 1100 * Theoretically we could create a chain of checkpoint files and 1101 * operate the checkpointing operation kinda like an incremental 1102 * checkpoint, but a checkpoint restore would then likely wind up 1103 * referencing many prior checkpoint files and that is a bit over 1104 * the top for the purpose of the checkpoint API. 1105 */ 1106 if (entry->object.vm_object->type == OBJT_VNODE) { 1107 vp = (struct vnode *)entry->object.vm_object->handle; 1108 if ((vp->v_flag & VCKPT) && curproc->p_textvp == vp) 1109 return 0; 1110 if (vnh == fpc->vnh_max) 1111 return EINVAL; 1112 1113 if (vp->v_mount) 1114 vnh->vnh_fh.fh_fsid = vp->v_mount->mnt_stat.f_fsid; 1115 error = VFS_VPTOFH(vp, &vnh->vnh_fh.fh_fid); 1116 if (error) { 1117 char *freepath, *fullpath; 1118 1119 if (vn_fullpath(curproc, vp, &fullpath, &freepath)) { 1120 kprintf("Warning: coredump, error %d: cannot store file handle for vnode %p\n", error, vp); 1121 } else { 1122 kprintf("Warning: coredump, error %d: cannot store file handle for %s\n", error, fullpath); 1123 kfree(freepath, M_TEMP); 1124 } 1125 error = 0; 1126 } 1127 1128 phdr->p_type = PT_LOAD; 1129 phdr->p_offset = 0; /* not written to core */ 1130 phdr->p_vaddr = entry->start; 1131 phdr->p_paddr = 0; 1132 phdr->p_filesz = phdr->p_memsz = entry->end - entry->start; 1133 phdr->p_align = PAGE_SIZE; 1134 phdr->p_flags = 0; 1135 if (entry->protection & VM_PROT_READ) 1136 phdr->p_flags |= PF_R; 1137 if (entry->protection & VM_PROT_WRITE) 1138 phdr->p_flags |= PF_W; 1139 if (entry->protection & VM_PROT_EXECUTE) 1140 phdr->p_flags |= PF_X; 1141 ++fpc->vnh; 1142 ++fpc->count; 1143 } 1144 return 0; 1145 } 1146 1147 /* 1148 * For each writable segment in the process's memory map, call the given 1149 * function with a pointer to the map entry and some arbitrary 1150 * caller-supplied data. 1151 */ 1152 static int 1153 each_segment(struct proc *p, segment_callback func, void *closure, int writable) 1154 { 1155 int error = 0; 1156 vm_map_t map = &p->p_vmspace->vm_map; 1157 vm_map_entry_t entry; 1158 1159 for (entry = map->header.next; error == 0 && entry != &map->header; 1160 entry = entry->next) { 1161 vm_object_t obj; 1162 1163 /* 1164 * Don't dump inaccessible mappings, deal with legacy 1165 * coredump mode. 1166 * 1167 * Note that read-only segments related to the elf binary 1168 * are marked MAP_ENTRY_NOCOREDUMP now so we no longer 1169 * need to arbitrarily ignore such segments. 1170 */ 1171 if (elf_legacy_coredump) { 1172 if (writable && (entry->protection & VM_PROT_RW) != VM_PROT_RW) 1173 continue; 1174 } else { 1175 if (writable && (entry->protection & VM_PROT_ALL) == 0) 1176 continue; 1177 } 1178 1179 /* 1180 * Dont include memory segment in the coredump if 1181 * MAP_NOCORE is set in mmap(2) or MADV_NOCORE in 1182 * madvise(2). 1183 * 1184 * Currently we only dump normal VM object maps. We do 1185 * not dump submaps or virtual page tables. 1186 */ 1187 if (writable && (entry->eflags & MAP_ENTRY_NOCOREDUMP)) 1188 continue; 1189 if (entry->maptype != VM_MAPTYPE_NORMAL) 1190 continue; 1191 if ((obj = entry->object.vm_object) == NULL) 1192 continue; 1193 1194 /* Find the deepest backing object. */ 1195 while (obj->backing_object != NULL) 1196 obj = obj->backing_object; 1197 1198 /* Ignore memory-mapped devices and such things. */ 1199 if (obj->type != OBJT_DEFAULT && 1200 obj->type != OBJT_SWAP && 1201 obj->type != OBJT_VNODE) 1202 continue; 1203 1204 error = (*func)(entry, closure); 1205 } 1206 return error; 1207 } 1208 1209 static 1210 void * 1211 target_reserve(elf_buf_t target, size_t bytes, int *error) 1212 { 1213 void *res = NULL; 1214 1215 if (target->buf) { 1216 if (target->off + bytes > target->off_max) 1217 *error = EINVAL; 1218 else 1219 res = target->buf + target->off; 1220 } 1221 target->off += bytes; 1222 return (res); 1223 } 1224 1225 /* 1226 * Write the core file header to the file, including padding up to 1227 * the page boundary. 1228 */ 1229 static int 1230 elf_corehdr(struct lwp *lp, int sig, struct file *fp, struct ucred *cred, 1231 int numsegs, elf_buf_t target) 1232 { 1233 int error; 1234 ssize_t nbytes; 1235 1236 /* 1237 * Fill in the header. The fp is passed so we can detect and flag 1238 * a checkpoint file pointer within the core file itself, because 1239 * it may not be restored from the same file handle. 1240 */ 1241 error = elf_puthdr(lp, target, sig, WRITE, numsegs, fp); 1242 1243 /* Write it to the core file. */ 1244 if (error == 0) { 1245 error = fp_write(fp, target->buf, target->off, &nbytes, 1246 UIO_SYSSPACE); 1247 } 1248 return error; 1249 } 1250 1251 static int 1252 elf_puthdr(struct lwp *lp, elf_buf_t target, int sig, enum putmode mode, 1253 int numsegs, struct file *fp) 1254 { 1255 struct proc *p = lp->lwp_proc; 1256 int error = 0; 1257 size_t phoff; 1258 size_t noteoff; 1259 size_t notesz; 1260 Elf_Ehdr *ehdr; 1261 Elf_Phdr *phdr; 1262 1263 ehdr = target_reserve(target, sizeof(Elf_Ehdr), &error); 1264 1265 phoff = target->off; 1266 phdr = target_reserve(target, (numsegs + 1) * sizeof(Elf_Phdr), &error); 1267 1268 noteoff = target->off; 1269 if (error == 0) 1270 elf_putallnotes(lp, target, sig, mode); 1271 notesz = target->off - noteoff; 1272 1273 /* 1274 * put extra cruft for dumping process state here 1275 * - we really want it be before all the program 1276 * mappings 1277 * - we just need to update the offset accordingly 1278 * and GDB will be none the wiser. 1279 */ 1280 if (error == 0) 1281 error = elf_puttextvp(p, target); 1282 if (error == 0) 1283 error = elf_putsigs(lp, target); 1284 if (error == 0) 1285 error = elf_putfiles(p, target, fp); 1286 1287 /* 1288 * Align up to a page boundary for the program segments. The 1289 * actual data will be written to the outptu file, not to elf_buf_t, 1290 * so we do not have to do any further bounds checking. 1291 */ 1292 target->off = round_page(target->off); 1293 if (error == 0 && ehdr != NULL) { 1294 /* 1295 * Fill in the ELF header. 1296 */ 1297 ehdr->e_ident[EI_MAG0] = ELFMAG0; 1298 ehdr->e_ident[EI_MAG1] = ELFMAG1; 1299 ehdr->e_ident[EI_MAG2] = ELFMAG2; 1300 ehdr->e_ident[EI_MAG3] = ELFMAG3; 1301 ehdr->e_ident[EI_CLASS] = ELF_CLASS; 1302 ehdr->e_ident[EI_DATA] = ELF_DATA; 1303 ehdr->e_ident[EI_VERSION] = EV_CURRENT; 1304 ehdr->e_ident[EI_OSABI] = ELFOSABI_FREEBSD; 1305 ehdr->e_ident[EI_ABIVERSION] = 0; 1306 ehdr->e_ident[EI_PAD] = 0; 1307 ehdr->e_type = ET_CORE; 1308 ehdr->e_machine = ELF_ARCH; 1309 ehdr->e_version = EV_CURRENT; 1310 ehdr->e_entry = 0; 1311 ehdr->e_phoff = phoff; 1312 ehdr->e_flags = 0; 1313 ehdr->e_ehsize = sizeof(Elf_Ehdr); 1314 ehdr->e_phentsize = sizeof(Elf_Phdr); 1315 ehdr->e_phnum = numsegs + 1; 1316 ehdr->e_shentsize = sizeof(Elf_Shdr); 1317 ehdr->e_shnum = 0; 1318 ehdr->e_shstrndx = SHN_UNDEF; 1319 } 1320 if (error == 0 && phdr != NULL) { 1321 /* 1322 * Fill in the program header entries. 1323 */ 1324 struct phdr_closure phc; 1325 1326 /* The note segement. */ 1327 phdr->p_type = PT_NOTE; 1328 phdr->p_offset = noteoff; 1329 phdr->p_vaddr = 0; 1330 phdr->p_paddr = 0; 1331 phdr->p_filesz = notesz; 1332 phdr->p_memsz = 0; 1333 phdr->p_flags = 0; 1334 phdr->p_align = 0; 1335 ++phdr; 1336 1337 /* All the writable segments from the program. */ 1338 phc.phdr = phdr; 1339 phc.phdr_max = phdr + numsegs; 1340 phc.offset = target->off; 1341 each_segment(p, cb_put_phdr, &phc, 1); 1342 } 1343 return (error); 1344 } 1345 1346 /* 1347 * Append core dump notes to target ELF buffer or simply update target size 1348 * if dryrun selected. 1349 */ 1350 static int 1351 elf_putallnotes(struct lwp *corelp, elf_buf_t target, int sig, 1352 enum putmode mode) 1353 { 1354 struct proc *p = corelp->lwp_proc; 1355 int error; 1356 struct { 1357 prstatus_t status; 1358 prfpregset_t fpregs; 1359 prpsinfo_t psinfo; 1360 } *tmpdata; 1361 prstatus_t *status; 1362 prfpregset_t *fpregs; 1363 prpsinfo_t *psinfo; 1364 struct lwp *lp; 1365 1366 /* 1367 * Allocate temporary storage for notes on heap to avoid stack overflow. 1368 */ 1369 if (mode != DRYRUN) { 1370 tmpdata = kmalloc(sizeof(*tmpdata), M_TEMP, M_ZERO | M_WAITOK); 1371 status = &tmpdata->status; 1372 fpregs = &tmpdata->fpregs; 1373 psinfo = &tmpdata->psinfo; 1374 } else { 1375 tmpdata = NULL; 1376 status = NULL; 1377 fpregs = NULL; 1378 psinfo = NULL; 1379 } 1380 1381 /* 1382 * Append LWP-agnostic note. 1383 */ 1384 if (mode != DRYRUN) { 1385 psinfo->pr_version = PRPSINFO_VERSION; 1386 psinfo->pr_psinfosz = sizeof(prpsinfo_t); 1387 strncpy(psinfo->pr_fname, p->p_comm, 1388 sizeof(psinfo->pr_fname) - 1); 1389 /* 1390 * XXX - We don't fill in the command line arguments 1391 * properly yet. 1392 */ 1393 strncpy(psinfo->pr_psargs, p->p_comm, PRARGSZ); 1394 } 1395 error = 1396 elf_putnote(target, "FreeBSD", NT_PRPSINFO, psinfo, sizeof *psinfo); 1397 if (error) 1398 goto exit; 1399 1400 /* 1401 * Append first note for LWP that triggered core so that it is 1402 * the selected one when the debugger starts. 1403 */ 1404 if (mode != DRYRUN) { 1405 status->pr_version = PRSTATUS_VERSION; 1406 status->pr_statussz = sizeof(prstatus_t); 1407 status->pr_gregsetsz = sizeof(gregset_t); 1408 status->pr_fpregsetsz = sizeof(fpregset_t); 1409 status->pr_osreldate = osreldate; 1410 status->pr_cursig = sig; 1411 /* 1412 * XXX GDB needs unique pr_pid for each LWP and does not 1413 * not support pr_pid==0 but lwp_tid can be 0, so hack unique 1414 * value. 1415 */ 1416 status->pr_pid = p->p_pid + corelp->lwp_tid; 1417 fill_regs(corelp, &status->pr_reg); 1418 fill_fpregs(corelp, fpregs); 1419 } 1420 error = 1421 elf_putnote(target, "FreeBSD", NT_PRSTATUS, status, sizeof *status); 1422 if (error) 1423 goto exit; 1424 error = 1425 elf_putnote(target, "FreeBSD", NT_FPREGSET, fpregs, sizeof *fpregs); 1426 if (error) 1427 goto exit; 1428 1429 /* 1430 * Then append notes for other LWPs. 1431 */ 1432 FOREACH_LWP_IN_PROC(lp, p) { 1433 if (lp == corelp) 1434 continue; 1435 /* skip lwps being created */ 1436 if (lp->lwp_thread == NULL) 1437 continue; 1438 if (mode != DRYRUN) { 1439 status->pr_pid = p->p_pid + lp->lwp_tid; 1440 fill_regs(lp, &status->pr_reg); 1441 fill_fpregs(lp, fpregs); 1442 } 1443 error = elf_putnote(target, "FreeBSD", NT_PRSTATUS, 1444 status, sizeof *status); 1445 if (error) 1446 goto exit; 1447 error = elf_putnote(target, "FreeBSD", NT_FPREGSET, 1448 fpregs, sizeof *fpregs); 1449 if (error) 1450 goto exit; 1451 } 1452 1453 exit: 1454 if (tmpdata != NULL) 1455 kfree(tmpdata, M_TEMP); 1456 return (error); 1457 } 1458 1459 /* 1460 * Generate a note sub-structure. 1461 * 1462 * NOTE: 4-byte alignment. 1463 */ 1464 static int 1465 elf_putnote(elf_buf_t target, const char *name, int type, 1466 const void *desc, size_t descsz) 1467 { 1468 int error = 0; 1469 char *dst; 1470 Elf_Note note; 1471 1472 note.n_namesz = strlen(name) + 1; 1473 note.n_descsz = descsz; 1474 note.n_type = type; 1475 dst = target_reserve(target, sizeof(note), &error); 1476 if (dst != NULL) 1477 bcopy(¬e, dst, sizeof note); 1478 dst = target_reserve(target, note.n_namesz, &error); 1479 if (dst != NULL) 1480 bcopy(name, dst, note.n_namesz); 1481 target->off = roundup2(target->off, sizeof(Elf_Word)); 1482 dst = target_reserve(target, note.n_descsz, &error); 1483 if (dst != NULL) 1484 bcopy(desc, dst, note.n_descsz); 1485 target->off = roundup2(target->off, sizeof(Elf_Word)); 1486 return(error); 1487 } 1488 1489 1490 static int 1491 elf_putsigs(struct lwp *lp, elf_buf_t target) 1492 { 1493 /* XXX lwp handle more than one lwp */ 1494 struct proc *p = lp->lwp_proc; 1495 int error = 0; 1496 struct ckpt_siginfo *csi; 1497 1498 csi = target_reserve(target, sizeof(struct ckpt_siginfo), &error); 1499 if (csi) { 1500 csi->csi_ckptpisz = sizeof(struct ckpt_siginfo); 1501 bcopy(p->p_sigacts, &csi->csi_sigacts, sizeof(*p->p_sigacts)); 1502 bcopy(&p->p_realtimer, &csi->csi_itimerval, sizeof(struct itimerval)); 1503 bcopy(&lp->lwp_sigmask, &csi->csi_sigmask, 1504 sizeof(sigset_t)); 1505 csi->csi_sigparent = p->p_sigparent; 1506 } 1507 return(error); 1508 } 1509 1510 static int 1511 elf_putfiles(struct proc *p, elf_buf_t target, struct file *ckfp) 1512 { 1513 int error = 0; 1514 int i; 1515 struct ckpt_filehdr *cfh = NULL; 1516 struct ckpt_fileinfo *cfi; 1517 struct file *fp; 1518 struct vnode *vp; 1519 /* 1520 * the duplicated loop is gross, but it was the only way 1521 * to eliminate uninitialized variable warnings 1522 */ 1523 cfh = target_reserve(target, sizeof(struct ckpt_filehdr), &error); 1524 if (cfh) { 1525 cfh->cfh_nfiles = 0; 1526 } 1527 1528 /* 1529 * ignore STDIN/STDERR/STDOUT. 1530 */ 1531 for (i = 3; error == 0 && i < p->p_fd->fd_nfiles; i++) { 1532 fp = holdfp(p->p_fd, i, -1); 1533 if (fp == NULL) 1534 continue; 1535 /* 1536 * XXX Only checkpoint vnodes for now. 1537 */ 1538 if (fp->f_type != DTYPE_VNODE) { 1539 fdrop(fp); 1540 continue; 1541 } 1542 cfi = target_reserve(target, sizeof(struct ckpt_fileinfo), 1543 &error); 1544 if (cfi == NULL) { 1545 fdrop(fp); 1546 continue; 1547 } 1548 cfi->cfi_index = -1; 1549 cfi->cfi_type = fp->f_type; 1550 cfi->cfi_flags = fp->f_flag; 1551 cfi->cfi_offset = fp->f_offset; 1552 cfi->cfi_ckflags = 0; 1553 1554 if (fp == ckfp) 1555 cfi->cfi_ckflags |= CKFIF_ISCKPTFD; 1556 /* f_count and f_msgcount should not be saved/restored */ 1557 /* XXX save cred info */ 1558 1559 switch(fp->f_type) { 1560 case DTYPE_VNODE: 1561 vp = (struct vnode *)fp->f_data; 1562 /* 1563 * it looks like a bug in ptrace is marking 1564 * a non-vnode as a vnode - until we find the 1565 * root cause this will at least prevent 1566 * further panics from truss 1567 */ 1568 if (vp == NULL || vp->v_mount == NULL) 1569 break; 1570 cfh->cfh_nfiles++; 1571 cfi->cfi_index = i; 1572 cfi->cfi_fh.fh_fsid = vp->v_mount->mnt_stat.f_fsid; 1573 error = VFS_VPTOFH(vp, &cfi->cfi_fh.fh_fid); 1574 break; 1575 default: 1576 break; 1577 } 1578 fdrop(fp); 1579 } 1580 return(error); 1581 } 1582 1583 static int 1584 elf_puttextvp(struct proc *p, elf_buf_t target) 1585 { 1586 int error = 0; 1587 int *vn_count; 1588 struct fp_closure fpc; 1589 struct ckpt_vminfo *vminfo; 1590 1591 vminfo = target_reserve(target, sizeof(struct ckpt_vminfo), &error); 1592 if (vminfo != NULL) { 1593 vminfo->cvm_dsize = p->p_vmspace->vm_dsize; 1594 vminfo->cvm_tsize = p->p_vmspace->vm_tsize; 1595 vminfo->cvm_daddr = p->p_vmspace->vm_daddr; 1596 vminfo->cvm_taddr = p->p_vmspace->vm_taddr; 1597 } 1598 1599 fpc.count = 0; 1600 vn_count = target_reserve(target, sizeof(int), &error); 1601 if (target->buf != NULL) { 1602 fpc.vnh = (struct vn_hdr *)(target->buf + target->off); 1603 fpc.vnh_max = fpc.vnh + 1604 (target->off_max - target->off) / sizeof(struct vn_hdr); 1605 error = each_segment(p, cb_put_fp, &fpc, 0); 1606 if (vn_count) 1607 *vn_count = fpc.count; 1608 } else { 1609 error = each_segment(p, cb_fpcount_segment, &fpc.count, 0); 1610 } 1611 target->off += fpc.count * sizeof(struct vn_hdr); 1612 return(error); 1613 } 1614 1615 1616 /* 1617 * Tell kern_execve.c about it, with a little help from the linker. 1618 */ 1619 static struct execsw elf_execsw = {exec_elf_imgact, "ELF"}; 1620 EXEC_SET_ORDERED(elf, elf_execsw, SI_ORDER_FIRST); 1621