imgact_elf.c revision 217152
1/*- 2 * Copyright (c) 2000 David O'Brien 3 * Copyright (c) 1995-1996 S�ren Schmidt 4 * Copyright (c) 1996 Peter Wemm 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer 12 * in this position and unchanged. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. The name of the author may not be used to endorse or promote products 17 * derived from this software without specific prior written permission 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 20 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 21 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 22 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 23 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 24 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 28 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 29 */ 30 31#include <sys/cdefs.h> 32__FBSDID("$FreeBSD: head/sys/kern/imgact_elf.c 217152 2011-01-08 16:30:59Z kib $"); 33 34#include "opt_compat.h" 35#include "opt_core.h" 36 37#include <sys/param.h> 38#include <sys/exec.h> 39#include <sys/fcntl.h> 40#include <sys/imgact.h> 41#include <sys/imgact_elf.h> 42#include <sys/kernel.h> 43#include <sys/lock.h> 44#include <sys/malloc.h> 45#include <sys/mount.h> 46#include <sys/mutex.h> 47#include <sys/mman.h> 48#include <sys/namei.h> 49#include <sys/pioctl.h> 50#include <sys/proc.h> 51#include <sys/procfs.h> 52#include <sys/resourcevar.h> 53#include <sys/sf_buf.h> 54#include <sys/smp.h> 55#include <sys/systm.h> 56#include <sys/signalvar.h> 57#include <sys/stat.h> 58#include <sys/sx.h> 59#include <sys/syscall.h> 60#include <sys/sysctl.h> 61#include <sys/sysent.h> 62#include <sys/vnode.h> 63#include <sys/syslog.h> 64#include <sys/eventhandler.h> 65 66#include <net/zlib.h> 67 68#include <vm/vm.h> 69#include <vm/vm_kern.h> 70#include <vm/vm_param.h> 71#include <vm/pmap.h> 72#include <vm/vm_map.h> 73#include <vm/vm_object.h> 74#include <vm/vm_extern.h> 75 76#include <machine/elf.h> 77#include <machine/md_var.h> 78 79#define OLD_EI_BRAND 8 80 81static int __elfN(check_header)(const Elf_Ehdr *hdr); 82static Elf_Brandinfo *__elfN(get_brandinfo)(struct image_params *imgp, 83 const char *interp, int32_t *osrel); 84static int __elfN(load_file)(struct proc *p, const char *file, u_long *addr, 85 u_long *entry, size_t pagesize); 86static int __elfN(load_section)(struct vmspace *vmspace, vm_object_t object, 87 vm_offset_t offset, caddr_t vmaddr, size_t memsz, size_t filsz, 88 vm_prot_t prot, size_t pagesize); 89static int __CONCAT(exec_, __elfN(imgact))(struct image_params *imgp); 90static boolean_t __elfN(freebsd_trans_osrel)(const Elf_Note *note, 91 int32_t *osrel); 92static boolean_t kfreebsd_trans_osrel(const Elf_Note *note, int32_t *osrel); 93static boolean_t __elfN(check_note)(struct image_params *imgp, 94 Elf_Brandnote *checknote, int32_t *osrel); 95static vm_prot_t __elfN(trans_prot)(Elf_Word); 96static Elf_Word __elfN(untrans_prot)(vm_prot_t); 97 98SYSCTL_NODE(_kern, OID_AUTO, __CONCAT(elf, __ELF_WORD_SIZE), CTLFLAG_RW, 0, 99 ""); 100 101#ifdef COMPRESS_USER_CORES 102static int compress_core(gzFile, char *, char *, unsigned int, 103 struct thread * td); 104#define CORE_BUF_SIZE (16 * 1024) 105#endif 106 107int __elfN(fallback_brand) = -1; 108SYSCTL_INT(__CONCAT(_kern_elf, __ELF_WORD_SIZE), OID_AUTO, 109 fallback_brand, CTLFLAG_RW, &__elfN(fallback_brand), 0, 110 __XSTRING(__CONCAT(ELF, __ELF_WORD_SIZE)) " brand of last resort"); 111TUNABLE_INT("kern.elf" __XSTRING(__ELF_WORD_SIZE) ".fallback_brand", 112 &__elfN(fallback_brand)); 113 114static int elf_legacy_coredump = 0; 115SYSCTL_INT(_debug, OID_AUTO, __elfN(legacy_coredump), CTLFLAG_RW, 116 &elf_legacy_coredump, 0, ""); 117 118static int __elfN(nxstack) = 0; 119SYSCTL_INT(__CONCAT(_kern_elf, __ELF_WORD_SIZE), OID_AUTO, 120 nxstack, CTLFLAG_RW, &__elfN(nxstack), 0, 121 __XSTRING(__CONCAT(ELF, __ELF_WORD_SIZE)) ": enable non-executable stack"); 122 123static Elf_Brandinfo *elf_brand_list[MAX_BRANDS]; 124 125#define trunc_page_ps(va, ps) ((va) & ~(ps - 1)) 126#define round_page_ps(va, ps) (((va) + (ps - 1)) & ~(ps - 1)) 127#define aligned(a, t) (trunc_page_ps((u_long)(a), sizeof(t)) == (u_long)(a)) 128 129static const char FREEBSD_ABI_VENDOR[] = "FreeBSD"; 130 131Elf_Brandnote __elfN(freebsd_brandnote) = { 132 .hdr.n_namesz = sizeof(FREEBSD_ABI_VENDOR), 133 .hdr.n_descsz = sizeof(int32_t), 134 .hdr.n_type = 1, 135 .vendor = FREEBSD_ABI_VENDOR, 136 .flags = BN_TRANSLATE_OSREL, 137 .trans_osrel = __elfN(freebsd_trans_osrel) 138}; 139 140static boolean_t 141__elfN(freebsd_trans_osrel)(const Elf_Note *note, int32_t *osrel) 142{ 143 uintptr_t p; 144 145 p = (uintptr_t)(note + 1); 146 p += roundup2(note->n_namesz, sizeof(Elf32_Addr)); 147 *osrel = *(const int32_t *)(p); 148 149 return (TRUE); 150} 151 152static const char GNU_ABI_VENDOR[] = "GNU"; 153static int GNU_KFREEBSD_ABI_DESC = 3; 154 155Elf_Brandnote __elfN(kfreebsd_brandnote) = { 156 .hdr.n_namesz = sizeof(GNU_ABI_VENDOR), 157 .hdr.n_descsz = 16, /* XXX at least 16 */ 158 .hdr.n_type = 1, 159 .vendor = GNU_ABI_VENDOR, 160 .flags = BN_TRANSLATE_OSREL, 161 .trans_osrel = kfreebsd_trans_osrel 162}; 163 164static boolean_t 165kfreebsd_trans_osrel(const Elf_Note *note, int32_t *osrel) 166{ 167 const Elf32_Word *desc; 168 uintptr_t p; 169 170 p = (uintptr_t)(note + 1); 171 p += roundup2(note->n_namesz, sizeof(Elf32_Addr)); 172 173 desc = (const Elf32_Word *)p; 174 if (desc[0] != GNU_KFREEBSD_ABI_DESC) 175 return (FALSE); 176 177 /* 178 * Debian GNU/kFreeBSD embed the earliest compatible kernel version 179 * (__FreeBSD_version: <major><two digit minor>Rxx) in the LSB way. 180 */ 181 *osrel = desc[1] * 100000 + desc[2] * 1000 + desc[3]; 182 183 return (TRUE); 184} 185 186int 187__elfN(insert_brand_entry)(Elf_Brandinfo *entry) 188{ 189 int i; 190 191 for (i = 0; i < MAX_BRANDS; i++) { 192 if (elf_brand_list[i] == NULL) { 193 elf_brand_list[i] = entry; 194 break; 195 } 196 } 197 if (i == MAX_BRANDS) { 198 printf("WARNING: %s: could not insert brandinfo entry: %p\n", 199 __func__, entry); 200 return (-1); 201 } 202 return (0); 203} 204 205int 206__elfN(remove_brand_entry)(Elf_Brandinfo *entry) 207{ 208 int i; 209 210 for (i = 0; i < MAX_BRANDS; i++) { 211 if (elf_brand_list[i] == entry) { 212 elf_brand_list[i] = NULL; 213 break; 214 } 215 } 216 if (i == MAX_BRANDS) 217 return (-1); 218 return (0); 219} 220 221int 222__elfN(brand_inuse)(Elf_Brandinfo *entry) 223{ 224 struct proc *p; 225 int rval = FALSE; 226 227 sx_slock(&allproc_lock); 228 FOREACH_PROC_IN_SYSTEM(p) { 229 if (p->p_sysent == entry->sysvec) { 230 rval = TRUE; 231 break; 232 } 233 } 234 sx_sunlock(&allproc_lock); 235 236 return (rval); 237} 238 239static Elf_Brandinfo * 240__elfN(get_brandinfo)(struct image_params *imgp, const char *interp, 241 int32_t *osrel) 242{ 243 const Elf_Ehdr *hdr = (const Elf_Ehdr *)imgp->image_header; 244 Elf_Brandinfo *bi; 245 boolean_t ret; 246 int i; 247 248 /* 249 * We support four types of branding -- (1) the ELF EI_OSABI field 250 * that SCO added to the ELF spec, (2) FreeBSD 3.x's traditional string 251 * branding w/in the ELF header, (3) path of the `interp_path' 252 * field, and (4) the ".note.ABI-tag" ELF section. 253 */ 254 255 /* Look for an ".note.ABI-tag" ELF section */ 256 for (i = 0; i < MAX_BRANDS; i++) { 257 bi = elf_brand_list[i]; 258 if (bi == NULL) 259 continue; 260 if (hdr->e_machine == bi->machine && (bi->flags & 261 (BI_BRAND_NOTE|BI_BRAND_NOTE_MANDATORY)) != 0) { 262 ret = __elfN(check_note)(imgp, bi->brand_note, osrel); 263 if (ret) 264 return (bi); 265 } 266 } 267 268 /* If the executable has a brand, search for it in the brand list. */ 269 for (i = 0; i < MAX_BRANDS; i++) { 270 bi = elf_brand_list[i]; 271 if (bi == NULL || bi->flags & BI_BRAND_NOTE_MANDATORY) 272 continue; 273 if (hdr->e_machine == bi->machine && 274 (hdr->e_ident[EI_OSABI] == bi->brand || 275 strncmp((const char *)&hdr->e_ident[OLD_EI_BRAND], 276 bi->compat_3_brand, strlen(bi->compat_3_brand)) == 0)) 277 return (bi); 278 } 279 280 /* Lacking a known brand, search for a recognized interpreter. */ 281 if (interp != NULL) { 282 for (i = 0; i < MAX_BRANDS; i++) { 283 bi = elf_brand_list[i]; 284 if (bi == NULL || bi->flags & BI_BRAND_NOTE_MANDATORY) 285 continue; 286 if (hdr->e_machine == bi->machine && 287 strcmp(interp, bi->interp_path) == 0) 288 return (bi); 289 } 290 } 291 292 /* Lacking a recognized interpreter, try the default brand */ 293 for (i = 0; i < MAX_BRANDS; i++) { 294 bi = elf_brand_list[i]; 295 if (bi == NULL || bi->flags & BI_BRAND_NOTE_MANDATORY) 296 continue; 297 if (hdr->e_machine == bi->machine && 298 __elfN(fallback_brand) == bi->brand) 299 return (bi); 300 } 301 return (NULL); 302} 303 304static int 305__elfN(check_header)(const Elf_Ehdr *hdr) 306{ 307 Elf_Brandinfo *bi; 308 int i; 309 310 if (!IS_ELF(*hdr) || 311 hdr->e_ident[EI_CLASS] != ELF_TARG_CLASS || 312 hdr->e_ident[EI_DATA] != ELF_TARG_DATA || 313 hdr->e_ident[EI_VERSION] != EV_CURRENT || 314 hdr->e_phentsize != sizeof(Elf_Phdr) || 315 hdr->e_version != ELF_TARG_VER) 316 return (ENOEXEC); 317 318 /* 319 * Make sure we have at least one brand for this machine. 320 */ 321 322 for (i = 0; i < MAX_BRANDS; i++) { 323 bi = elf_brand_list[i]; 324 if (bi != NULL && bi->machine == hdr->e_machine) 325 break; 326 } 327 if (i == MAX_BRANDS) 328 return (ENOEXEC); 329 330 return (0); 331} 332 333static int 334__elfN(map_partial)(vm_map_t map, vm_object_t object, vm_ooffset_t offset, 335 vm_offset_t start, vm_offset_t end, vm_prot_t prot) 336{ 337 struct sf_buf *sf; 338 int error; 339 vm_offset_t off; 340 341 /* 342 * Create the page if it doesn't exist yet. Ignore errors. 343 */ 344 vm_map_lock(map); 345 vm_map_insert(map, NULL, 0, trunc_page(start), round_page(end), 346 VM_PROT_ALL, VM_PROT_ALL, 0); 347 vm_map_unlock(map); 348 349 /* 350 * Find the page from the underlying object. 351 */ 352 if (object) { 353 sf = vm_imgact_map_page(object, offset); 354 if (sf == NULL) 355 return (KERN_FAILURE); 356 off = offset - trunc_page(offset); 357 error = copyout((caddr_t)sf_buf_kva(sf) + off, (caddr_t)start, 358 end - start); 359 vm_imgact_unmap_page(sf); 360 if (error) { 361 return (KERN_FAILURE); 362 } 363 } 364 365 return (KERN_SUCCESS); 366} 367 368static int 369__elfN(map_insert)(vm_map_t map, vm_object_t object, vm_ooffset_t offset, 370 vm_offset_t start, vm_offset_t end, vm_prot_t prot, int cow) 371{ 372 struct sf_buf *sf; 373 vm_offset_t off; 374 vm_size_t sz; 375 int error, rv; 376 377 if (start != trunc_page(start)) { 378 rv = __elfN(map_partial)(map, object, offset, start, 379 round_page(start), prot); 380 if (rv) 381 return (rv); 382 offset += round_page(start) - start; 383 start = round_page(start); 384 } 385 if (end != round_page(end)) { 386 rv = __elfN(map_partial)(map, object, offset + 387 trunc_page(end) - start, trunc_page(end), end, prot); 388 if (rv) 389 return (rv); 390 end = trunc_page(end); 391 } 392 if (end > start) { 393 if (offset & PAGE_MASK) { 394 /* 395 * The mapping is not page aligned. This means we have 396 * to copy the data. Sigh. 397 */ 398 rv = vm_map_find(map, NULL, 0, &start, end - start, 399 FALSE, prot | VM_PROT_WRITE, VM_PROT_ALL, 0); 400 if (rv) 401 return (rv); 402 if (object == NULL) 403 return (KERN_SUCCESS); 404 for (; start < end; start += sz) { 405 sf = vm_imgact_map_page(object, offset); 406 if (sf == NULL) 407 return (KERN_FAILURE); 408 off = offset - trunc_page(offset); 409 sz = end - start; 410 if (sz > PAGE_SIZE - off) 411 sz = PAGE_SIZE - off; 412 error = copyout((caddr_t)sf_buf_kva(sf) + off, 413 (caddr_t)start, sz); 414 vm_imgact_unmap_page(sf); 415 if (error) { 416 return (KERN_FAILURE); 417 } 418 offset += sz; 419 } 420 rv = KERN_SUCCESS; 421 } else { 422 vm_object_reference(object); 423 vm_map_lock(map); 424 rv = vm_map_insert(map, object, offset, start, end, 425 prot, VM_PROT_ALL, cow); 426 vm_map_unlock(map); 427 if (rv != KERN_SUCCESS) 428 vm_object_deallocate(object); 429 } 430 return (rv); 431 } else { 432 return (KERN_SUCCESS); 433 } 434} 435 436static int 437__elfN(load_section)(struct vmspace *vmspace, 438 vm_object_t object, vm_offset_t offset, 439 caddr_t vmaddr, size_t memsz, size_t filsz, vm_prot_t prot, 440 size_t pagesize) 441{ 442 struct sf_buf *sf; 443 size_t map_len; 444 vm_offset_t map_addr; 445 int error, rv, cow; 446 size_t copy_len; 447 vm_offset_t file_addr; 448 449 /* 450 * It's necessary to fail if the filsz + offset taken from the 451 * header is greater than the actual file pager object's size. 452 * If we were to allow this, then the vm_map_find() below would 453 * walk right off the end of the file object and into the ether. 454 * 455 * While I'm here, might as well check for something else that 456 * is invalid: filsz cannot be greater than memsz. 457 */ 458 if ((off_t)filsz + offset > object->un_pager.vnp.vnp_size || 459 filsz > memsz) { 460 uprintf("elf_load_section: truncated ELF file\n"); 461 return (ENOEXEC); 462 } 463 464 map_addr = trunc_page_ps((vm_offset_t)vmaddr, pagesize); 465 file_addr = trunc_page_ps(offset, pagesize); 466 467 /* 468 * We have two choices. We can either clear the data in the last page 469 * of an oversized mapping, or we can start the anon mapping a page 470 * early and copy the initialized data into that first page. We 471 * choose the second.. 472 */ 473 if (memsz > filsz) 474 map_len = trunc_page_ps(offset + filsz, pagesize) - file_addr; 475 else 476 map_len = round_page_ps(offset + filsz, pagesize) - file_addr; 477 478 if (map_len != 0) { 479 /* cow flags: don't dump readonly sections in core */ 480 cow = MAP_COPY_ON_WRITE | MAP_PREFAULT | 481 (prot & VM_PROT_WRITE ? 0 : MAP_DISABLE_COREDUMP); 482 483 rv = __elfN(map_insert)(&vmspace->vm_map, 484 object, 485 file_addr, /* file offset */ 486 map_addr, /* virtual start */ 487 map_addr + map_len,/* virtual end */ 488 prot, 489 cow); 490 if (rv != KERN_SUCCESS) 491 return (EINVAL); 492 493 /* we can stop now if we've covered it all */ 494 if (memsz == filsz) { 495 return (0); 496 } 497 } 498 499 500 /* 501 * We have to get the remaining bit of the file into the first part 502 * of the oversized map segment. This is normally because the .data 503 * segment in the file is extended to provide bss. It's a neat idea 504 * to try and save a page, but it's a pain in the behind to implement. 505 */ 506 copy_len = (offset + filsz) - trunc_page_ps(offset + filsz, pagesize); 507 map_addr = trunc_page_ps((vm_offset_t)vmaddr + filsz, pagesize); 508 map_len = round_page_ps((vm_offset_t)vmaddr + memsz, pagesize) - 509 map_addr; 510 511 /* This had damn well better be true! */ 512 if (map_len != 0) { 513 rv = __elfN(map_insert)(&vmspace->vm_map, NULL, 0, map_addr, 514 map_addr + map_len, VM_PROT_ALL, 0); 515 if (rv != KERN_SUCCESS) { 516 return (EINVAL); 517 } 518 } 519 520 if (copy_len != 0) { 521 vm_offset_t off; 522 523 sf = vm_imgact_map_page(object, offset + filsz); 524 if (sf == NULL) 525 return (EIO); 526 527 /* send the page fragment to user space */ 528 off = trunc_page_ps(offset + filsz, pagesize) - 529 trunc_page(offset + filsz); 530 error = copyout((caddr_t)sf_buf_kva(sf) + off, 531 (caddr_t)map_addr, copy_len); 532 vm_imgact_unmap_page(sf); 533 if (error) { 534 return (error); 535 } 536 } 537 538 /* 539 * set it to the specified protection. 540 * XXX had better undo the damage from pasting over the cracks here! 541 */ 542 vm_map_protect(&vmspace->vm_map, trunc_page(map_addr), 543 round_page(map_addr + map_len), prot, FALSE); 544 545 return (0); 546} 547 548/* 549 * Load the file "file" into memory. It may be either a shared object 550 * or an executable. 551 * 552 * The "addr" reference parameter is in/out. On entry, it specifies 553 * the address where a shared object should be loaded. If the file is 554 * an executable, this value is ignored. On exit, "addr" specifies 555 * where the file was actually loaded. 556 * 557 * The "entry" reference parameter is out only. On exit, it specifies 558 * the entry point for the loaded file. 559 */ 560static int 561__elfN(load_file)(struct proc *p, const char *file, u_long *addr, 562 u_long *entry, size_t pagesize) 563{ 564 struct { 565 struct nameidata nd; 566 struct vattr attr; 567 struct image_params image_params; 568 } *tempdata; 569 const Elf_Ehdr *hdr = NULL; 570 const Elf_Phdr *phdr = NULL; 571 struct nameidata *nd; 572 struct vmspace *vmspace = p->p_vmspace; 573 struct vattr *attr; 574 struct image_params *imgp; 575 vm_prot_t prot; 576 u_long rbase; 577 u_long base_addr = 0; 578 int vfslocked, error, i, numsegs; 579 580 tempdata = malloc(sizeof(*tempdata), M_TEMP, M_WAITOK); 581 nd = &tempdata->nd; 582 attr = &tempdata->attr; 583 imgp = &tempdata->image_params; 584 585 /* 586 * Initialize part of the common data 587 */ 588 imgp->proc = p; 589 imgp->attr = attr; 590 imgp->firstpage = NULL; 591 imgp->image_header = NULL; 592 imgp->object = NULL; 593 imgp->execlabel = NULL; 594 595 NDINIT(nd, LOOKUP, MPSAFE|LOCKLEAF|FOLLOW, UIO_SYSSPACE, file, 596 curthread); 597 vfslocked = 0; 598 if ((error = namei(nd)) != 0) { 599 nd->ni_vp = NULL; 600 goto fail; 601 } 602 vfslocked = NDHASGIANT(nd); 603 NDFREE(nd, NDF_ONLY_PNBUF); 604 imgp->vp = nd->ni_vp; 605 606 /* 607 * Check permissions, modes, uid, etc on the file, and "open" it. 608 */ 609 error = exec_check_permissions(imgp); 610 if (error) 611 goto fail; 612 613 error = exec_map_first_page(imgp); 614 if (error) 615 goto fail; 616 617 /* 618 * Also make certain that the interpreter stays the same, so set 619 * its VV_TEXT flag, too. 620 */ 621 nd->ni_vp->v_vflag |= VV_TEXT; 622 623 imgp->object = nd->ni_vp->v_object; 624 625 hdr = (const Elf_Ehdr *)imgp->image_header; 626 if ((error = __elfN(check_header)(hdr)) != 0) 627 goto fail; 628 if (hdr->e_type == ET_DYN) 629 rbase = *addr; 630 else if (hdr->e_type == ET_EXEC) 631 rbase = 0; 632 else { 633 error = ENOEXEC; 634 goto fail; 635 } 636 637 /* Only support headers that fit within first page for now */ 638 /* (multiplication of two Elf_Half fields will not overflow) */ 639 if ((hdr->e_phoff > PAGE_SIZE) || 640 (hdr->e_phentsize * hdr->e_phnum) > PAGE_SIZE - hdr->e_phoff) { 641 error = ENOEXEC; 642 goto fail; 643 } 644 645 phdr = (const Elf_Phdr *)(imgp->image_header + hdr->e_phoff); 646 if (!aligned(phdr, Elf_Addr)) { 647 error = ENOEXEC; 648 goto fail; 649 } 650 651 for (i = 0, numsegs = 0; i < hdr->e_phnum; i++) { 652 if (phdr[i].p_type == PT_LOAD && phdr[i].p_memsz != 0) { 653 /* Loadable segment */ 654 prot = __elfN(trans_prot)(phdr[i].p_flags); 655 if ((error = __elfN(load_section)(vmspace, 656 imgp->object, phdr[i].p_offset, 657 (caddr_t)(uintptr_t)phdr[i].p_vaddr + rbase, 658 phdr[i].p_memsz, phdr[i].p_filesz, prot, 659 pagesize)) != 0) 660 goto fail; 661 /* 662 * Establish the base address if this is the 663 * first segment. 664 */ 665 if (numsegs == 0) 666 base_addr = trunc_page(phdr[i].p_vaddr + 667 rbase); 668 numsegs++; 669 } 670 } 671 *addr = base_addr; 672 *entry = (unsigned long)hdr->e_entry + rbase; 673 674fail: 675 if (imgp->firstpage) 676 exec_unmap_first_page(imgp); 677 678 if (nd->ni_vp) 679 vput(nd->ni_vp); 680 681 VFS_UNLOCK_GIANT(vfslocked); 682 free(tempdata, M_TEMP); 683 684 return (error); 685} 686 687static int 688__CONCAT(exec_, __elfN(imgact))(struct image_params *imgp) 689{ 690 const Elf_Ehdr *hdr = (const Elf_Ehdr *)imgp->image_header; 691 const Elf_Phdr *phdr; 692 Elf_Auxargs *elf_auxargs; 693 struct vmspace *vmspace; 694 vm_prot_t prot; 695 u_long text_size = 0, data_size = 0, total_size = 0; 696 u_long text_addr = 0, data_addr = 0; 697 u_long seg_size, seg_addr; 698 u_long addr, baddr, et_dyn_addr, entry = 0, proghdr = 0; 699 int32_t osrel = 0; 700 int error = 0, i, n; 701 const char *interp = NULL, *newinterp = NULL; 702 Elf_Brandinfo *brand_info; 703 char *path; 704 struct sysentvec *sv; 705 706 /* 707 * Do we have a valid ELF header ? 708 * 709 * Only allow ET_EXEC & ET_DYN here, reject ET_DYN later 710 * if particular brand doesn't support it. 711 */ 712 if (__elfN(check_header)(hdr) != 0 || 713 (hdr->e_type != ET_EXEC && hdr->e_type != ET_DYN)) 714 return (-1); 715 716 /* 717 * From here on down, we return an errno, not -1, as we've 718 * detected an ELF file. 719 */ 720 721 if ((hdr->e_phoff > PAGE_SIZE) || 722 (hdr->e_phoff + hdr->e_phentsize * hdr->e_phnum) > PAGE_SIZE) { 723 /* Only support headers in first page for now */ 724 return (ENOEXEC); 725 } 726 phdr = (const Elf_Phdr *)(imgp->image_header + hdr->e_phoff); 727 if (!aligned(phdr, Elf_Addr)) 728 return (ENOEXEC); 729 n = 0; 730 baddr = 0; 731 for (i = 0; i < hdr->e_phnum; i++) { 732 switch (phdr[i].p_type) { 733 case PT_LOAD: 734 if (n == 0) 735 baddr = phdr[i].p_vaddr; 736 n++; 737 break; 738 case PT_INTERP: 739 /* Path to interpreter */ 740 if (phdr[i].p_filesz > MAXPATHLEN || 741 phdr[i].p_offset + phdr[i].p_filesz > PAGE_SIZE) 742 return (ENOEXEC); 743 interp = imgp->image_header + phdr[i].p_offset; 744 break; 745 case PT_GNU_STACK: 746 if (__elfN(nxstack)) 747 imgp->stack_prot = 748 __elfN(trans_prot)(phdr[i].p_flags); 749 break; 750 } 751 } 752 753 brand_info = __elfN(get_brandinfo)(imgp, interp, &osrel); 754 if (brand_info == NULL) { 755 uprintf("ELF binary type \"%u\" not known.\n", 756 hdr->e_ident[EI_OSABI]); 757 return (ENOEXEC); 758 } 759 if (hdr->e_type == ET_DYN) { 760 if ((brand_info->flags & BI_CAN_EXEC_DYN) == 0) 761 return (ENOEXEC); 762 /* 763 * Honour the base load address from the dso if it is 764 * non-zero for some reason. 765 */ 766 if (baddr == 0) 767 et_dyn_addr = ET_DYN_LOAD_ADDR; 768 else 769 et_dyn_addr = 0; 770 } else 771 et_dyn_addr = 0; 772 sv = brand_info->sysvec; 773 if (interp != NULL && brand_info->interp_newpath != NULL) 774 newinterp = brand_info->interp_newpath; 775 776 /* 777 * Avoid a possible deadlock if the current address space is destroyed 778 * and that address space maps the locked vnode. In the common case, 779 * the locked vnode's v_usecount is decremented but remains greater 780 * than zero. Consequently, the vnode lock is not needed by vrele(). 781 * However, in cases where the vnode lock is external, such as nullfs, 782 * v_usecount may become zero. 783 */ 784 VOP_UNLOCK(imgp->vp, 0); 785 786 error = exec_new_vmspace(imgp, sv); 787 imgp->proc->p_sysent = sv; 788 789 vn_lock(imgp->vp, LK_EXCLUSIVE | LK_RETRY); 790 if (error) 791 return (error); 792 793 vmspace = imgp->proc->p_vmspace; 794 795 for (i = 0; i < hdr->e_phnum; i++) { 796 switch (phdr[i].p_type) { 797 case PT_LOAD: /* Loadable segment */ 798 if (phdr[i].p_memsz == 0) 799 break; 800 prot = __elfN(trans_prot)(phdr[i].p_flags); 801 802#if defined(__ia64__) && __ELF_WORD_SIZE == 32 && defined(IA32_ME_HARDER) 803 /* 804 * Some x86 binaries assume read == executable, 805 * notably the M3 runtime and therefore cvsup 806 */ 807 if (prot & VM_PROT_READ) 808 prot |= VM_PROT_EXECUTE; 809#endif 810 811 if ((error = __elfN(load_section)(vmspace, 812 imgp->object, phdr[i].p_offset, 813 (caddr_t)(uintptr_t)phdr[i].p_vaddr + et_dyn_addr, 814 phdr[i].p_memsz, phdr[i].p_filesz, prot, 815 sv->sv_pagesize)) != 0) 816 return (error); 817 818 /* 819 * If this segment contains the program headers, 820 * remember their virtual address for the AT_PHDR 821 * aux entry. Static binaries don't usually include 822 * a PT_PHDR entry. 823 */ 824 if (phdr[i].p_offset == 0 && 825 hdr->e_phoff + hdr->e_phnum * hdr->e_phentsize 826 <= phdr[i].p_filesz) 827 proghdr = phdr[i].p_vaddr + hdr->e_phoff + 828 et_dyn_addr; 829 830 seg_addr = trunc_page(phdr[i].p_vaddr + et_dyn_addr); 831 seg_size = round_page(phdr[i].p_memsz + 832 phdr[i].p_vaddr + et_dyn_addr - seg_addr); 833 834 /* 835 * Make the largest executable segment the official 836 * text segment and all others data. 837 * 838 * Note that obreak() assumes that data_addr + 839 * data_size == end of data load area, and the ELF 840 * file format expects segments to be sorted by 841 * address. If multiple data segments exist, the 842 * last one will be used. 843 */ 844 845 if (phdr[i].p_flags & PF_X && text_size < seg_size) { 846 text_size = seg_size; 847 text_addr = seg_addr; 848 } else { 849 data_size = seg_size; 850 data_addr = seg_addr; 851 } 852 total_size += seg_size; 853 break; 854 case PT_PHDR: /* Program header table info */ 855 proghdr = phdr[i].p_vaddr + et_dyn_addr; 856 break; 857 default: 858 break; 859 } 860 } 861 862 if (data_addr == 0 && data_size == 0) { 863 data_addr = text_addr; 864 data_size = text_size; 865 } 866 867 entry = (u_long)hdr->e_entry + et_dyn_addr; 868 869 /* 870 * Check limits. It should be safe to check the 871 * limits after loading the segments since we do 872 * not actually fault in all the segments pages. 873 */ 874 PROC_LOCK(imgp->proc); 875 if (data_size > lim_cur(imgp->proc, RLIMIT_DATA) || 876 text_size > maxtsiz || 877 total_size > lim_cur(imgp->proc, RLIMIT_VMEM)) { 878 PROC_UNLOCK(imgp->proc); 879 return (ENOMEM); 880 } 881 882 vmspace->vm_tsize = text_size >> PAGE_SHIFT; 883 vmspace->vm_taddr = (caddr_t)(uintptr_t)text_addr; 884 vmspace->vm_dsize = data_size >> PAGE_SHIFT; 885 vmspace->vm_daddr = (caddr_t)(uintptr_t)data_addr; 886 887 /* 888 * We load the dynamic linker where a userland call 889 * to mmap(0, ...) would put it. The rationale behind this 890 * calculation is that it leaves room for the heap to grow to 891 * its maximum allowed size. 892 */ 893 addr = round_page((vm_offset_t)imgp->proc->p_vmspace->vm_daddr + 894 lim_max(imgp->proc, RLIMIT_DATA)); 895 PROC_UNLOCK(imgp->proc); 896 897 imgp->entry_addr = entry; 898 899 if (interp != NULL) { 900 int have_interp = FALSE; 901 VOP_UNLOCK(imgp->vp, 0); 902 if (brand_info->emul_path != NULL && 903 brand_info->emul_path[0] != '\0') { 904 path = malloc(MAXPATHLEN, M_TEMP, M_WAITOK); 905 snprintf(path, MAXPATHLEN, "%s%s", 906 brand_info->emul_path, interp); 907 error = __elfN(load_file)(imgp->proc, path, &addr, 908 &imgp->entry_addr, sv->sv_pagesize); 909 free(path, M_TEMP); 910 if (error == 0) 911 have_interp = TRUE; 912 } 913 if (!have_interp && newinterp != NULL) { 914 error = __elfN(load_file)(imgp->proc, newinterp, &addr, 915 &imgp->entry_addr, sv->sv_pagesize); 916 if (error == 0) 917 have_interp = TRUE; 918 } 919 if (!have_interp) { 920 error = __elfN(load_file)(imgp->proc, interp, &addr, 921 &imgp->entry_addr, sv->sv_pagesize); 922 } 923 vn_lock(imgp->vp, LK_EXCLUSIVE | LK_RETRY); 924 if (error != 0) { 925 uprintf("ELF interpreter %s not found\n", interp); 926 return (error); 927 } 928 } else 929 addr = et_dyn_addr; 930 931 /* 932 * Construct auxargs table (used by the fixup routine) 933 */ 934 elf_auxargs = malloc(sizeof(Elf_Auxargs), M_TEMP, M_WAITOK); 935 elf_auxargs->execfd = -1; 936 elf_auxargs->phdr = proghdr; 937 elf_auxargs->phent = hdr->e_phentsize; 938 elf_auxargs->phnum = hdr->e_phnum; 939 elf_auxargs->pagesz = PAGE_SIZE; 940 elf_auxargs->base = addr; 941 elf_auxargs->flags = 0; 942 elf_auxargs->entry = entry; 943 944 imgp->auxargs = elf_auxargs; 945 imgp->interpreted = 0; 946 imgp->reloc_base = addr; 947 imgp->proc->p_osrel = osrel; 948 949 return (error); 950} 951 952#define suword __CONCAT(suword, __ELF_WORD_SIZE) 953 954int 955__elfN(freebsd_fixup)(register_t **stack_base, struct image_params *imgp) 956{ 957 Elf_Auxargs *args = (Elf_Auxargs *)imgp->auxargs; 958 Elf_Addr *base; 959 Elf_Addr *pos; 960 961 base = (Elf_Addr *)*stack_base; 962 pos = base + (imgp->args->argc + imgp->args->envc + 2); 963 964 if (args->execfd != -1) 965 AUXARGS_ENTRY(pos, AT_EXECFD, args->execfd); 966 AUXARGS_ENTRY(pos, AT_PHDR, args->phdr); 967 AUXARGS_ENTRY(pos, AT_PHENT, args->phent); 968 AUXARGS_ENTRY(pos, AT_PHNUM, args->phnum); 969 AUXARGS_ENTRY(pos, AT_PAGESZ, args->pagesz); 970 AUXARGS_ENTRY(pos, AT_FLAGS, args->flags); 971 AUXARGS_ENTRY(pos, AT_ENTRY, args->entry); 972 AUXARGS_ENTRY(pos, AT_BASE, args->base); 973 if (imgp->execpathp != 0) 974 AUXARGS_ENTRY(pos, AT_EXECPATH, imgp->execpathp); 975 AUXARGS_ENTRY(pos, AT_OSRELDATE, osreldate); 976 if (imgp->canary != 0) { 977 AUXARGS_ENTRY(pos, AT_CANARY, imgp->canary); 978 AUXARGS_ENTRY(pos, AT_CANARYLEN, imgp->canarylen); 979 } 980 AUXARGS_ENTRY(pos, AT_NCPUS, mp_ncpus); 981 if (imgp->pagesizes != 0) { 982 AUXARGS_ENTRY(pos, AT_PAGESIZES, imgp->pagesizes); 983 AUXARGS_ENTRY(pos, AT_PAGESIZESLEN, imgp->pagesizeslen); 984 } 985 AUXARGS_ENTRY(pos, AT_STACKPROT, imgp->stack_prot != 0 ? 986 imgp->stack_prot : imgp->sysent->sv_stackprot); 987 AUXARGS_ENTRY(pos, AT_NULL, 0); 988 989 free(imgp->auxargs, M_TEMP); 990 imgp->auxargs = NULL; 991 992 base--; 993 suword(base, (long)imgp->args->argc); 994 *stack_base = (register_t *)base; 995 return (0); 996} 997 998/* 999 * Code for generating ELF core dumps. 1000 */ 1001 1002typedef void (*segment_callback)(vm_map_entry_t, void *); 1003 1004/* Closure for cb_put_phdr(). */ 1005struct phdr_closure { 1006 Elf_Phdr *phdr; /* Program header to fill in */ 1007 Elf_Off offset; /* Offset of segment in core file */ 1008}; 1009 1010/* Closure for cb_size_segment(). */ 1011struct sseg_closure { 1012 int count; /* Count of writable segments. */ 1013 size_t size; /* Total size of all writable segments. */ 1014}; 1015 1016static void cb_put_phdr(vm_map_entry_t, void *); 1017static void cb_size_segment(vm_map_entry_t, void *); 1018static void each_writable_segment(struct thread *, segment_callback, void *); 1019static int __elfN(corehdr)(struct thread *, struct vnode *, struct ucred *, 1020 int, void *, size_t, gzFile); 1021static void __elfN(puthdr)(struct thread *, void *, size_t *, int); 1022static void __elfN(putnote)(void *, size_t *, const char *, int, 1023 const void *, size_t); 1024 1025#ifdef COMPRESS_USER_CORES 1026extern int compress_user_cores; 1027extern int compress_user_cores_gzlevel; 1028#endif 1029 1030static int 1031core_output(struct vnode *vp, void *base, size_t len, off_t offset, 1032 struct ucred *active_cred, struct ucred *file_cred, 1033 struct thread *td, char *core_buf, gzFile gzfile) { 1034 1035 int error; 1036 if (gzfile) { 1037#ifdef COMPRESS_USER_CORES 1038 error = compress_core(gzfile, base, core_buf, len, td); 1039#else 1040 panic("shouldn't be here"); 1041#endif 1042 } else { 1043 error = vn_rdwr_inchunks(UIO_WRITE, vp, base, len, offset, 1044 UIO_USERSPACE, IO_UNIT | IO_DIRECT, active_cred, file_cred, 1045 NULL, td); 1046 } 1047 return (error); 1048} 1049 1050int 1051__elfN(coredump)(struct thread *td, struct vnode *vp, off_t limit, int flags) 1052{ 1053 struct ucred *cred = td->td_ucred; 1054 int error = 0; 1055 struct sseg_closure seginfo; 1056 void *hdr; 1057 size_t hdrsize; 1058 1059 gzFile gzfile = Z_NULL; 1060 char *core_buf = NULL; 1061#ifdef COMPRESS_USER_CORES 1062 char gzopen_flags[8]; 1063 char *p; 1064 int doing_compress = flags & IMGACT_CORE_COMPRESS; 1065#endif 1066 1067 hdr = NULL; 1068 1069#ifdef COMPRESS_USER_CORES 1070 if (doing_compress) { 1071 p = gzopen_flags; 1072 *p++ = 'w'; 1073 if (compress_user_cores_gzlevel >= 0 && 1074 compress_user_cores_gzlevel <= 9) 1075 *p++ = '0' + compress_user_cores_gzlevel; 1076 *p = 0; 1077 gzfile = gz_open("", gzopen_flags, vp); 1078 if (gzfile == Z_NULL) { 1079 error = EFAULT; 1080 goto done; 1081 } 1082 core_buf = malloc(CORE_BUF_SIZE, M_TEMP, M_WAITOK | M_ZERO); 1083 if (!core_buf) { 1084 error = ENOMEM; 1085 goto done; 1086 } 1087 } 1088#endif 1089 1090 /* Size the program segments. */ 1091 seginfo.count = 0; 1092 seginfo.size = 0; 1093 each_writable_segment(td, cb_size_segment, &seginfo); 1094 1095 /* 1096 * Calculate the size of the core file header area by making 1097 * a dry run of generating it. Nothing is written, but the 1098 * size is calculated. 1099 */ 1100 hdrsize = 0; 1101 __elfN(puthdr)(td, (void *)NULL, &hdrsize, seginfo.count); 1102 1103 if (hdrsize + seginfo.size >= limit) { 1104 error = EFAULT; 1105 goto done; 1106 } 1107 1108 /* 1109 * Allocate memory for building the header, fill it up, 1110 * and write it out. 1111 */ 1112 hdr = malloc(hdrsize, M_TEMP, M_WAITOK); 1113 if (hdr == NULL) { 1114 error = EINVAL; 1115 goto done; 1116 } 1117 error = __elfN(corehdr)(td, vp, cred, seginfo.count, hdr, hdrsize, 1118 gzfile); 1119 1120 /* Write the contents of all of the writable segments. */ 1121 if (error == 0) { 1122 Elf_Phdr *php; 1123 off_t offset; 1124 int i; 1125 1126 php = (Elf_Phdr *)((char *)hdr + sizeof(Elf_Ehdr)) + 1; 1127 offset = hdrsize; 1128 for (i = 0; i < seginfo.count; i++) { 1129 error = core_output(vp, (caddr_t)(uintptr_t)php->p_vaddr, 1130 php->p_filesz, offset, cred, NOCRED, curthread, core_buf, gzfile); 1131 if (error != 0) 1132 break; 1133 offset += php->p_filesz; 1134 php++; 1135 } 1136 } 1137 if (error) { 1138 log(LOG_WARNING, 1139 "Failed to write core file for process %s (error %d)\n", 1140 curproc->p_comm, error); 1141 } 1142 1143done: 1144#ifdef COMPRESS_USER_CORES 1145 if (core_buf) 1146 free(core_buf, M_TEMP); 1147 if (gzfile) 1148 gzclose(gzfile); 1149#endif 1150 1151 free(hdr, M_TEMP); 1152 1153 return (error); 1154} 1155 1156/* 1157 * A callback for each_writable_segment() to write out the segment's 1158 * program header entry. 1159 */ 1160static void 1161cb_put_phdr(entry, closure) 1162 vm_map_entry_t entry; 1163 void *closure; 1164{ 1165 struct phdr_closure *phc = (struct phdr_closure *)closure; 1166 Elf_Phdr *phdr = phc->phdr; 1167 1168 phc->offset = round_page(phc->offset); 1169 1170 phdr->p_type = PT_LOAD; 1171 phdr->p_offset = phc->offset; 1172 phdr->p_vaddr = entry->start; 1173 phdr->p_paddr = 0; 1174 phdr->p_filesz = phdr->p_memsz = entry->end - entry->start; 1175 phdr->p_align = PAGE_SIZE; 1176 phdr->p_flags = __elfN(untrans_prot)(entry->protection); 1177 1178 phc->offset += phdr->p_filesz; 1179 phc->phdr++; 1180} 1181 1182/* 1183 * A callback for each_writable_segment() to gather information about 1184 * the number of segments and their total size. 1185 */ 1186static void 1187cb_size_segment(entry, closure) 1188 vm_map_entry_t entry; 1189 void *closure; 1190{ 1191 struct sseg_closure *ssc = (struct sseg_closure *)closure; 1192 1193 ssc->count++; 1194 ssc->size += entry->end - entry->start; 1195} 1196 1197/* 1198 * For each writable segment in the process's memory map, call the given 1199 * function with a pointer to the map entry and some arbitrary 1200 * caller-supplied data. 1201 */ 1202static void 1203each_writable_segment(td, func, closure) 1204 struct thread *td; 1205 segment_callback func; 1206 void *closure; 1207{ 1208 struct proc *p = td->td_proc; 1209 vm_map_t map = &p->p_vmspace->vm_map; 1210 vm_map_entry_t entry; 1211 vm_object_t backing_object, object; 1212 boolean_t ignore_entry; 1213 1214 vm_map_lock_read(map); 1215 for (entry = map->header.next; entry != &map->header; 1216 entry = entry->next) { 1217 /* 1218 * Don't dump inaccessible mappings, deal with legacy 1219 * coredump mode. 1220 * 1221 * Note that read-only segments related to the elf binary 1222 * are marked MAP_ENTRY_NOCOREDUMP now so we no longer 1223 * need to arbitrarily ignore such segments. 1224 */ 1225 if (elf_legacy_coredump) { 1226 if ((entry->protection & VM_PROT_RW) != VM_PROT_RW) 1227 continue; 1228 } else { 1229 if ((entry->protection & VM_PROT_ALL) == 0) 1230 continue; 1231 } 1232 1233 /* 1234 * Dont include memory segment in the coredump if 1235 * MAP_NOCORE is set in mmap(2) or MADV_NOCORE in 1236 * madvise(2). Do not dump submaps (i.e. parts of the 1237 * kernel map). 1238 */ 1239 if (entry->eflags & (MAP_ENTRY_NOCOREDUMP|MAP_ENTRY_IS_SUB_MAP)) 1240 continue; 1241 1242 if ((object = entry->object.vm_object) == NULL) 1243 continue; 1244 1245 /* Ignore memory-mapped devices and such things. */ 1246 VM_OBJECT_LOCK(object); 1247 while ((backing_object = object->backing_object) != NULL) { 1248 VM_OBJECT_LOCK(backing_object); 1249 VM_OBJECT_UNLOCK(object); 1250 object = backing_object; 1251 } 1252 ignore_entry = object->type != OBJT_DEFAULT && 1253 object->type != OBJT_SWAP && object->type != OBJT_VNODE; 1254 VM_OBJECT_UNLOCK(object); 1255 if (ignore_entry) 1256 continue; 1257 1258 (*func)(entry, closure); 1259 } 1260 vm_map_unlock_read(map); 1261} 1262 1263/* 1264 * Write the core file header to the file, including padding up to 1265 * the page boundary. 1266 */ 1267static int 1268__elfN(corehdr)(td, vp, cred, numsegs, hdr, hdrsize, gzfile) 1269 struct thread *td; 1270 struct vnode *vp; 1271 struct ucred *cred; 1272 int numsegs; 1273 size_t hdrsize; 1274 void *hdr; 1275 gzFile gzfile; 1276{ 1277 size_t off; 1278 1279 /* Fill in the header. */ 1280 bzero(hdr, hdrsize); 1281 off = 0; 1282 __elfN(puthdr)(td, hdr, &off, numsegs); 1283 1284 if (!gzfile) { 1285 /* Write it to the core file. */ 1286 return (vn_rdwr_inchunks(UIO_WRITE, vp, hdr, hdrsize, (off_t)0, 1287 UIO_SYSSPACE, IO_UNIT | IO_DIRECT, cred, NOCRED, NULL, 1288 td)); 1289 } else { 1290#ifdef COMPRESS_USER_CORES 1291 if (gzwrite(gzfile, hdr, hdrsize) != hdrsize) { 1292 log(LOG_WARNING, 1293 "Failed to compress core file header for process" 1294 " %s.\n", curproc->p_comm); 1295 return (EFAULT); 1296 } 1297 else { 1298 return (0); 1299 } 1300#else 1301 panic("shouldn't be here"); 1302#endif 1303 } 1304} 1305 1306#if defined(COMPAT_FREEBSD32) && __ELF_WORD_SIZE == 32 1307#include <compat/freebsd32/freebsd32.h> 1308 1309typedef struct prstatus32 elf_prstatus_t; 1310typedef struct prpsinfo32 elf_prpsinfo_t; 1311typedef struct fpreg32 elf_prfpregset_t; 1312typedef struct fpreg32 elf_fpregset_t; 1313typedef struct reg32 elf_gregset_t; 1314typedef struct thrmisc32 elf_thrmisc_t; 1315#else 1316typedef prstatus_t elf_prstatus_t; 1317typedef prpsinfo_t elf_prpsinfo_t; 1318typedef prfpregset_t elf_prfpregset_t; 1319typedef prfpregset_t elf_fpregset_t; 1320typedef gregset_t elf_gregset_t; 1321typedef thrmisc_t elf_thrmisc_t; 1322#endif 1323 1324static void 1325__elfN(puthdr)(struct thread *td, void *dst, size_t *off, int numsegs) 1326{ 1327 struct { 1328 elf_prstatus_t status; 1329 elf_prfpregset_t fpregset; 1330 elf_prpsinfo_t psinfo; 1331 elf_thrmisc_t thrmisc; 1332 } *tempdata; 1333 elf_prstatus_t *status; 1334 elf_prfpregset_t *fpregset; 1335 elf_prpsinfo_t *psinfo; 1336 elf_thrmisc_t *thrmisc; 1337 struct proc *p; 1338 struct thread *thr; 1339 size_t ehoff, noteoff, notesz, phoff; 1340 1341 p = td->td_proc; 1342 1343 ehoff = *off; 1344 *off += sizeof(Elf_Ehdr); 1345 1346 phoff = *off; 1347 *off += (numsegs + 1) * sizeof(Elf_Phdr); 1348 1349 noteoff = *off; 1350 /* 1351 * Don't allocate space for the notes if we're just calculating 1352 * the size of the header. We also don't collect the data. 1353 */ 1354 if (dst != NULL) { 1355 tempdata = malloc(sizeof(*tempdata), M_TEMP, M_ZERO|M_WAITOK); 1356 status = &tempdata->status; 1357 fpregset = &tempdata->fpregset; 1358 psinfo = &tempdata->psinfo; 1359 thrmisc = &tempdata->thrmisc; 1360 } else { 1361 tempdata = NULL; 1362 status = NULL; 1363 fpregset = NULL; 1364 psinfo = NULL; 1365 thrmisc = NULL; 1366 } 1367 1368 if (dst != NULL) { 1369 psinfo->pr_version = PRPSINFO_VERSION; 1370 psinfo->pr_psinfosz = sizeof(elf_prpsinfo_t); 1371 strlcpy(psinfo->pr_fname, p->p_comm, sizeof(psinfo->pr_fname)); 1372 /* 1373 * XXX - We don't fill in the command line arguments properly 1374 * yet. 1375 */ 1376 strlcpy(psinfo->pr_psargs, p->p_comm, 1377 sizeof(psinfo->pr_psargs)); 1378 } 1379 __elfN(putnote)(dst, off, "FreeBSD", NT_PRPSINFO, psinfo, 1380 sizeof *psinfo); 1381 1382 /* 1383 * To have the debugger select the right thread (LWP) as the initial 1384 * thread, we dump the state of the thread passed to us in td first. 1385 * This is the thread that causes the core dump and thus likely to 1386 * be the right thread one wants to have selected in the debugger. 1387 */ 1388 thr = td; 1389 while (thr != NULL) { 1390 if (dst != NULL) { 1391 status->pr_version = PRSTATUS_VERSION; 1392 status->pr_statussz = sizeof(elf_prstatus_t); 1393 status->pr_gregsetsz = sizeof(elf_gregset_t); 1394 status->pr_fpregsetsz = sizeof(elf_fpregset_t); 1395 status->pr_osreldate = osreldate; 1396 status->pr_cursig = p->p_sig; 1397 status->pr_pid = thr->td_tid; 1398#if defined(COMPAT_FREEBSD32) && __ELF_WORD_SIZE == 32 1399 fill_regs32(thr, &status->pr_reg); 1400 fill_fpregs32(thr, fpregset); 1401#else 1402 fill_regs(thr, &status->pr_reg); 1403 fill_fpregs(thr, fpregset); 1404#endif 1405 memset(&thrmisc->_pad, 0, sizeof (thrmisc->_pad)); 1406 strcpy(thrmisc->pr_tname, thr->td_name); 1407 } 1408 __elfN(putnote)(dst, off, "FreeBSD", NT_PRSTATUS, status, 1409 sizeof *status); 1410 __elfN(putnote)(dst, off, "FreeBSD", NT_FPREGSET, fpregset, 1411 sizeof *fpregset); 1412 __elfN(putnote)(dst, off, "FreeBSD", NT_THRMISC, thrmisc, 1413 sizeof *thrmisc); 1414 /* 1415 * Allow for MD specific notes, as well as any MD 1416 * specific preparations for writing MI notes. 1417 */ 1418 __elfN(dump_thread)(thr, dst, off); 1419 1420 thr = (thr == td) ? TAILQ_FIRST(&p->p_threads) : 1421 TAILQ_NEXT(thr, td_plist); 1422 if (thr == td) 1423 thr = TAILQ_NEXT(thr, td_plist); 1424 } 1425 1426 notesz = *off - noteoff; 1427 1428 if (dst != NULL) 1429 free(tempdata, M_TEMP); 1430 1431 /* Align up to a page boundary for the program segments. */ 1432 *off = round_page(*off); 1433 1434 if (dst != NULL) { 1435 Elf_Ehdr *ehdr; 1436 Elf_Phdr *phdr; 1437 struct phdr_closure phc; 1438 1439 /* 1440 * Fill in the ELF header. 1441 */ 1442 ehdr = (Elf_Ehdr *)((char *)dst + ehoff); 1443 ehdr->e_ident[EI_MAG0] = ELFMAG0; 1444 ehdr->e_ident[EI_MAG1] = ELFMAG1; 1445 ehdr->e_ident[EI_MAG2] = ELFMAG2; 1446 ehdr->e_ident[EI_MAG3] = ELFMAG3; 1447 ehdr->e_ident[EI_CLASS] = ELF_CLASS; 1448 ehdr->e_ident[EI_DATA] = ELF_DATA; 1449 ehdr->e_ident[EI_VERSION] = EV_CURRENT; 1450 ehdr->e_ident[EI_OSABI] = ELFOSABI_FREEBSD; 1451 ehdr->e_ident[EI_ABIVERSION] = 0; 1452 ehdr->e_ident[EI_PAD] = 0; 1453 ehdr->e_type = ET_CORE; 1454#if defined(COMPAT_FREEBSD32) && __ELF_WORD_SIZE == 32 1455 ehdr->e_machine = ELF_ARCH32; 1456#else 1457 ehdr->e_machine = ELF_ARCH; 1458#endif 1459 ehdr->e_version = EV_CURRENT; 1460 ehdr->e_entry = 0; 1461 ehdr->e_phoff = phoff; 1462 ehdr->e_flags = 0; 1463 ehdr->e_ehsize = sizeof(Elf_Ehdr); 1464 ehdr->e_phentsize = sizeof(Elf_Phdr); 1465 ehdr->e_phnum = numsegs + 1; 1466 ehdr->e_shentsize = sizeof(Elf_Shdr); 1467 ehdr->e_shnum = 0; 1468 ehdr->e_shstrndx = SHN_UNDEF; 1469 1470 /* 1471 * Fill in the program header entries. 1472 */ 1473 phdr = (Elf_Phdr *)((char *)dst + phoff); 1474 1475 /* The note segement. */ 1476 phdr->p_type = PT_NOTE; 1477 phdr->p_offset = noteoff; 1478 phdr->p_vaddr = 0; 1479 phdr->p_paddr = 0; 1480 phdr->p_filesz = notesz; 1481 phdr->p_memsz = 0; 1482 phdr->p_flags = 0; 1483 phdr->p_align = 0; 1484 phdr++; 1485 1486 /* All the writable segments from the program. */ 1487 phc.phdr = phdr; 1488 phc.offset = *off; 1489 each_writable_segment(td, cb_put_phdr, &phc); 1490 } 1491} 1492 1493static void 1494__elfN(putnote)(void *dst, size_t *off, const char *name, int type, 1495 const void *desc, size_t descsz) 1496{ 1497 Elf_Note note; 1498 1499 note.n_namesz = strlen(name) + 1; 1500 note.n_descsz = descsz; 1501 note.n_type = type; 1502 if (dst != NULL) 1503 bcopy(¬e, (char *)dst + *off, sizeof note); 1504 *off += sizeof note; 1505 if (dst != NULL) 1506 bcopy(name, (char *)dst + *off, note.n_namesz); 1507 *off += roundup2(note.n_namesz, sizeof(Elf_Size)); 1508 if (dst != NULL) 1509 bcopy(desc, (char *)dst + *off, note.n_descsz); 1510 *off += roundup2(note.n_descsz, sizeof(Elf_Size)); 1511} 1512 1513/* 1514 * Try to find the appropriate ABI-note section for checknote, 1515 * fetch the osreldate for binary from the ELF OSABI-note. Only the 1516 * first page of the image is searched, the same as for headers. 1517 */ 1518static boolean_t 1519__elfN(check_note)(struct image_params *imgp, Elf_Brandnote *checknote, 1520 int32_t *osrel) 1521{ 1522 const Elf_Note *note, *note0, *note_end; 1523 const Elf_Phdr *phdr, *pnote; 1524 const Elf_Ehdr *hdr; 1525 const char *note_name; 1526 int i; 1527 1528 pnote = NULL; 1529 hdr = (const Elf_Ehdr *)imgp->image_header; 1530 phdr = (const Elf_Phdr *)(imgp->image_header + hdr->e_phoff); 1531 1532 for (i = 0; i < hdr->e_phnum; i++) { 1533 if (phdr[i].p_type == PT_NOTE) { 1534 pnote = &phdr[i]; 1535 break; 1536 } 1537 } 1538 1539 if (pnote == NULL || pnote->p_offset >= PAGE_SIZE || 1540 pnote->p_offset + pnote->p_filesz >= PAGE_SIZE) 1541 return (FALSE); 1542 1543 note = note0 = (const Elf_Note *)(imgp->image_header + pnote->p_offset); 1544 note_end = (const Elf_Note *)(imgp->image_header + 1545 pnote->p_offset + pnote->p_filesz); 1546 for (i = 0; i < 100 && note >= note0 && note < note_end; i++) { 1547 if (!aligned(note, Elf32_Addr)) 1548 return (FALSE); 1549 if (note->n_namesz != checknote->hdr.n_namesz || 1550 note->n_descsz != checknote->hdr.n_descsz || 1551 note->n_type != checknote->hdr.n_type) 1552 goto nextnote; 1553 note_name = (const char *)(note + 1); 1554 if (strncmp(checknote->vendor, note_name, 1555 checknote->hdr.n_namesz) != 0) 1556 goto nextnote; 1557 1558 /* 1559 * Fetch the osreldate for binary 1560 * from the ELF OSABI-note if necessary. 1561 */ 1562 if ((checknote->flags & BN_TRANSLATE_OSREL) != 0 && 1563 checknote->trans_osrel != NULL) 1564 return (checknote->trans_osrel(note, osrel)); 1565 return (TRUE); 1566 1567nextnote: 1568 note = (const Elf_Note *)((const char *)(note + 1) + 1569 roundup2(note->n_namesz, sizeof(Elf32_Addr)) + 1570 roundup2(note->n_descsz, sizeof(Elf32_Addr))); 1571 } 1572 1573 return (FALSE); 1574} 1575 1576/* 1577 * Tell kern_execve.c about it, with a little help from the linker. 1578 */ 1579static struct execsw __elfN(execsw) = { 1580 __CONCAT(exec_, __elfN(imgact)), 1581 __XSTRING(__CONCAT(ELF, __ELF_WORD_SIZE)) 1582}; 1583EXEC_SET(__CONCAT(elf, __ELF_WORD_SIZE), __elfN(execsw)); 1584 1585#ifdef COMPRESS_USER_CORES 1586/* 1587 * Compress and write out a core segment for a user process. 1588 * 1589 * 'inbuf' is the starting address of a VM segment in the process' address 1590 * space that is to be compressed and written out to the core file. 'dest_buf' 1591 * is a buffer in the kernel's address space. The segment is copied from 1592 * 'inbuf' to 'dest_buf' first before being processed by the compression 1593 * routine gzwrite(). This copying is necessary because the content of the VM 1594 * segment may change between the compression pass and the crc-computation pass 1595 * in gzwrite(). This is because realtime threads may preempt the UNIX kernel. 1596 */ 1597static int 1598compress_core (gzFile file, char *inbuf, char *dest_buf, unsigned int len, 1599 struct thread *td) 1600{ 1601 int len_compressed; 1602 int error = 0; 1603 unsigned int chunk_len; 1604 1605 while (len) { 1606 chunk_len = (len > CORE_BUF_SIZE) ? CORE_BUF_SIZE : len; 1607 copyin(inbuf, dest_buf, chunk_len); 1608 len_compressed = gzwrite(file, dest_buf, chunk_len); 1609 1610 EVENTHANDLER_INVOKE(app_coredump_progress, td, len_compressed); 1611 1612 if ((unsigned int)len_compressed != chunk_len) { 1613 log(LOG_WARNING, 1614 "compress_core: length mismatch (0x%x returned, " 1615 "0x%x expected)\n", len_compressed, chunk_len); 1616 EVENTHANDLER_INVOKE(app_coredump_error, td, 1617 "compress_core: length mismatch %x -> %x", 1618 chunk_len, len_compressed); 1619 error = EFAULT; 1620 break; 1621 } 1622 inbuf += chunk_len; 1623 len -= chunk_len; 1624 if (ticks - PCPU_GET(switchticks) >= hogticks) 1625 uio_yield(); 1626 } 1627 1628 return (error); 1629} 1630#endif /* COMPRESS_USER_CORES */ 1631 1632static vm_prot_t 1633__elfN(trans_prot)(Elf_Word flags) 1634{ 1635 vm_prot_t prot; 1636 1637 prot = 0; 1638 if (flags & PF_X) 1639 prot |= VM_PROT_EXECUTE; 1640 if (flags & PF_W) 1641 prot |= VM_PROT_WRITE; 1642 if (flags & PF_R) 1643 prot |= VM_PROT_READ; 1644 return (prot); 1645} 1646 1647static Elf_Word 1648__elfN(untrans_prot)(vm_prot_t prot) 1649{ 1650 Elf_Word flags; 1651 1652 flags = 0; 1653 if (prot & VM_PROT_EXECUTE) 1654 flags |= PF_X; 1655 if (prot & VM_PROT_READ) 1656 flags |= PF_R; 1657 if (prot & VM_PROT_WRITE) 1658 flags |= PF_W; 1659 return (flags); 1660} 1661