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("$FreeBSD$"); 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 81 static int __elfN(check_header)(const Elf_Ehdr *hdr); 82 static Elf_Brandinfo *__elfN(get_brandinfo)(struct image_params *imgp, 83 const char *interp, int32_t *osrel); 84 static int __elfN(load_file)(struct proc *p, const char *file, u_long *addr, 85 u_long *entry, size_t pagesize); 86 static 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); 89 static int __CONCAT(exec_, __elfN(imgact))(struct image_params *imgp); 90 static boolean_t __elfN(freebsd_trans_osrel)(const Elf_Note *note, 91 int32_t *osrel); 92 static boolean_t kfreebsd_trans_osrel(const Elf_Note *note, int32_t *osrel); 93 static boolean_t __elfN(check_note)(struct image_params *imgp, 94 Elf_Brandnote *checknote, int32_t *osrel); 95 static vm_prot_t __elfN(trans_prot)(Elf_Word); 96 static Elf_Word __elfN(untrans_prot)(vm_prot_t); 97 98 SYSCTL_NODE(_kern, OID_AUTO, __CONCAT(elf, __ELF_WORD_SIZE), CTLFLAG_RW, 0, 99 ""); 100 101 #ifdef COMPRESS_USER_CORES 102 static int compress_core(gzFile, char *, char *, unsigned int, 103 struct thread * td); 104 #define CORE_BUF_SIZE (16 * 1024) 105 #endif 106 107 int __elfN(fallback_brand) = -1; 108 SYSCTL_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"); 111 TUNABLE_INT("kern.elf" __XSTRING(__ELF_WORD_SIZE) ".fallback_brand", 112 &__elfN(fallback_brand)); 113 114 static int elf_legacy_coredump = 0; 115 SYSCTL_INT(_debug, OID_AUTO, __elfN(legacy_coredump), CTLFLAG_RW, 116 &elf_legacy_coredump, 0, ""); 117 118 static int __elfN(nxstack) = 0; 119 SYSCTL_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"); 122 123 static 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)) 128 129 static const char FREEBSD_ABI_VENDOR[] = "FreeBSD"; 130 131 Elf_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 }; 139 140 static 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 } 151 152 static const char GNU_ABI_VENDOR[] = "GNU"; 153 static int GNU_KFREEBSD_ABI_DESC = 3; 154 155 Elf_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 }; 163 164 static boolean_t 165 kfreebsd_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 } 185 186 int 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 } 204 205 int 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 } 220 221 int 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 } 238 239 static 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 } 303 304 static 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 } 332 333 static 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 } 367 368 static 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 } 435 436 static 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 */ 560 static 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; 673 674 fail: 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 } 686 687 static 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) 953 954 int 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->sysent->sv_shared_page_obj 986 != NULL && imgp->stack_prot != 0 ? imgp->stack_prot : 987 imgp->sysent->sv_stackprot); 988 AUXARGS_ENTRY(pos, AT_NULL, 0); 989 990 free(imgp->auxargs, M_TEMP); 991 imgp->auxargs = NULL; 992 993 base--; 994 suword(base, (long)imgp->args->argc); 995 *stack_base = (register_t *)base; 996 return (0); 997 } 998 999 /* 1000 * Code for generating ELF core dumps. 1001 */ 1002 1003 typedef void (*segment_callback)(vm_map_entry_t, void *); 1004 1005 /* Closure for cb_put_phdr(). */ 1006 struct phdr_closure { 1007 Elf_Phdr *phdr; /* Program header to fill in */ 1008 Elf_Off offset; /* Offset of segment in core file */ 1009 }; 1010 1011 /* Closure for cb_size_segment(). */ 1012 struct sseg_closure { 1013 int count; /* Count of writable segments. */ 1014 size_t size; /* Total size of all writable segments. */ 1015 }; 1016 1017 static void cb_put_phdr(vm_map_entry_t, void *); 1018 static void cb_size_segment(vm_map_entry_t, void *); 1019 static void each_writable_segment(struct thread *, segment_callback, void *); 1020 static int __elfN(corehdr)(struct thread *, struct vnode *, struct ucred *, 1021 int, void *, size_t, gzFile); 1022 static void __elfN(puthdr)(struct thread *, void *, size_t *, int); 1023 static void __elfN(putnote)(void *, size_t *, const char *, int, 1024 const void *, size_t); 1025 1026 #ifdef COMPRESS_USER_CORES 1027 extern int compress_user_cores; 1028 extern int compress_user_cores_gzlevel; 1029 #endif 1030 1031 static int 1032 core_output(struct vnode *vp, void *base, size_t len, off_t offset, 1033 struct ucred *active_cred, struct ucred *file_cred, 1034 struct thread *td, char *core_buf, gzFile gzfile) { 1035 1036 int error; 1037 if (gzfile) { 1038 #ifdef COMPRESS_USER_CORES 1039 error = compress_core(gzfile, base, core_buf, len, td); 1040 #else 1041 panic("shouldn't be here"); 1042 #endif 1043 } else { 1044 error = vn_rdwr_inchunks(UIO_WRITE, vp, base, len, offset, 1045 UIO_USERSPACE, IO_UNIT | IO_DIRECT, active_cred, file_cred, 1046 NULL, td); 1047 } 1048 return (error); 1049 } 1050 1051 int 1052 __elfN(coredump)(struct thread *td, struct vnode *vp, off_t limit, int flags) 1053 { 1054 struct ucred *cred = td->td_ucred; 1055 int error = 0; 1056 struct sseg_closure seginfo; 1057 void *hdr; 1058 size_t hdrsize; 1059 1060 gzFile gzfile = Z_NULL; 1061 char *core_buf = NULL; 1062 #ifdef COMPRESS_USER_CORES 1063 char gzopen_flags[8]; 1064 char *p; 1065 int doing_compress = flags & IMGACT_CORE_COMPRESS; 1066 #endif 1067 1068 hdr = NULL; 1069 1070 #ifdef COMPRESS_USER_CORES 1071 if (doing_compress) { 1072 p = gzopen_flags; 1073 *p++ = 'w'; 1074 if (compress_user_cores_gzlevel >= 0 && 1075 compress_user_cores_gzlevel <= 9) 1076 *p++ = '0' + compress_user_cores_gzlevel; 1077 *p = 0; 1078 gzfile = gz_open("", gzopen_flags, vp); 1079 if (gzfile == Z_NULL) { 1080 error = EFAULT; 1081 goto done; 1082 } 1083 core_buf = malloc(CORE_BUF_SIZE, M_TEMP, M_WAITOK | M_ZERO); 1084 if (!core_buf) { 1085 error = ENOMEM; 1086 goto done; 1087 } 1088 } 1089 #endif 1090 1091 /* Size the program segments. */ 1092 seginfo.count = 0; 1093 seginfo.size = 0; 1094 each_writable_segment(td, cb_size_segment, &seginfo); 1095 1096 /* 1097 * Calculate the size of the core file header area by making 1098 * a dry run of generating it. Nothing is written, but the 1099 * size is calculated. 1100 */ 1101 hdrsize = 0; 1102 __elfN(puthdr)(td, (void *)NULL, &hdrsize, seginfo.count); 1103 1104 if (hdrsize + seginfo.size >= limit) { 1105 error = EFAULT; 1106 goto done; 1107 } 1108 1109 /* 1110 * Allocate memory for building the header, fill it up, 1111 * and write it out. 1112 */ 1113 hdr = malloc(hdrsize, M_TEMP, M_WAITOK); 1114 if (hdr == NULL) { 1115 error = EINVAL; 1116 goto done; 1117 } 1118 error = __elfN(corehdr)(td, vp, cred, seginfo.count, hdr, hdrsize, 1119 gzfile); 1120 1121 /* Write the contents of all of the writable segments. */ 1122 if (error == 0) { 1123 Elf_Phdr *php; 1124 off_t offset; 1125 int i; 1126 1127 php = (Elf_Phdr *)((char *)hdr + sizeof(Elf_Ehdr)) + 1; 1128 offset = hdrsize; 1129 for (i = 0; i < seginfo.count; i++) { 1130 error = core_output(vp, (caddr_t)(uintptr_t)php->p_vaddr, 1131 php->p_filesz, offset, cred, NOCRED, curthread, core_buf, gzfile); 1132 if (error != 0) 1133 break; 1134 offset += php->p_filesz; 1135 php++; 1136 } 1137 } 1138 if (error) { 1139 log(LOG_WARNING, 1140 "Failed to write core file for process %s (error %d)\n", 1141 curproc->p_comm, error); 1142 } 1143 1144 done: 1145 #ifdef COMPRESS_USER_CORES 1146 if (core_buf) 1147 free(core_buf, M_TEMP); 1148 if (gzfile) 1149 gzclose(gzfile); 1150 #endif 1151 1152 free(hdr, M_TEMP); 1153 1154 return (error); 1155 } 1156 1157 /* 1158 * A callback for each_writable_segment() to write out the segment's 1159 * program header entry. 1160 */ 1161 static void 1162 cb_put_phdr(entry, closure) 1163 vm_map_entry_t entry; 1164 void *closure; 1165 { 1166 struct phdr_closure *phc = (struct phdr_closure *)closure; 1167 Elf_Phdr *phdr = phc->phdr; 1168 1169 phc->offset = round_page(phc->offset); 1170 1171 phdr->p_type = PT_LOAD; 1172 phdr->p_offset = phc->offset; 1173 phdr->p_vaddr = entry->start; 1174 phdr->p_paddr = 0; 1175 phdr->p_filesz = phdr->p_memsz = entry->end - entry->start; 1176 phdr->p_align = PAGE_SIZE; 1177 phdr->p_flags = __elfN(untrans_prot)(entry->protection); 1178 1179 phc->offset += phdr->p_filesz; 1180 phc->phdr++; 1181 } 1182 1183 /* 1184 * A callback for each_writable_segment() to gather information about 1185 * the number of segments and their total size. 1186 */ 1187 static void 1188 cb_size_segment(entry, closure) 1189 vm_map_entry_t entry; 1190 void *closure; 1191 { 1192 struct sseg_closure *ssc = (struct sseg_closure *)closure; 1193 1194 ssc->count++; 1195 ssc->size += entry->end - entry->start; 1196 } 1197 1198 /* 1199 * For each writable segment in the process's memory map, call the given 1200 * function with a pointer to the map entry and some arbitrary 1201 * caller-supplied data. 1202 */ 1203 static void 1204 each_writable_segment(td, func, closure) 1205 struct thread *td; 1206 segment_callback func; 1207 void *closure; 1208 { 1209 struct proc *p = td->td_proc; 1210 vm_map_t map = &p->p_vmspace->vm_map; 1211 vm_map_entry_t entry; 1212 vm_object_t backing_object, object; 1213 boolean_t ignore_entry; 1214 1215 vm_map_lock_read(map); 1216 for (entry = map->header.next; entry != &map->header; 1217 entry = entry->next) { 1218 /* 1219 * Don't dump inaccessible mappings, deal with legacy 1220 * coredump mode. 1221 * 1222 * Note that read-only segments related to the elf binary 1223 * are marked MAP_ENTRY_NOCOREDUMP now so we no longer 1224 * need to arbitrarily ignore such segments. 1225 */ 1226 if (elf_legacy_coredump) { 1227 if ((entry->protection & VM_PROT_RW) != VM_PROT_RW) 1228 continue; 1229 } else { 1230 if ((entry->protection & VM_PROT_ALL) == 0) 1231 continue; 1232 } 1233 1234 /* 1235 * Dont include memory segment in the coredump if 1236 * MAP_NOCORE is set in mmap(2) or MADV_NOCORE in 1237 * madvise(2). Do not dump submaps (i.e. parts of the 1238 * kernel map). 1239 */ 1240 if (entry->eflags & (MAP_ENTRY_NOCOREDUMP|MAP_ENTRY_IS_SUB_MAP)) 1241 continue; 1242 1243 if ((object = entry->object.vm_object) == NULL) 1244 continue; 1245 1246 /* Ignore memory-mapped devices and such things. */ 1247 VM_OBJECT_LOCK(object); 1248 while ((backing_object = object->backing_object) != NULL) { 1249 VM_OBJECT_LOCK(backing_object); 1250 VM_OBJECT_UNLOCK(object); 1251 object = backing_object; 1252 } 1253 ignore_entry = object->type != OBJT_DEFAULT && 1254 object->type != OBJT_SWAP && object->type != OBJT_VNODE; 1255 VM_OBJECT_UNLOCK(object); 1256 if (ignore_entry) 1257 continue; 1258 1259 (*func)(entry, closure); 1260 } 1261 vm_map_unlock_read(map); 1262 } 1263 1264 /* 1265 * Write the core file header to the file, including padding up to 1266 * the page boundary. 1267 */ 1268 static int 1269 __elfN(corehdr)(td, vp, cred, numsegs, hdr, hdrsize, gzfile) 1270 struct thread *td; 1271 struct vnode *vp; 1272 struct ucred *cred; 1273 int numsegs; 1274 size_t hdrsize; 1275 void *hdr; 1276 gzFile gzfile; 1277 { 1278 size_t off; 1279 1280 /* Fill in the header. */ 1281 bzero(hdr, hdrsize); 1282 off = 0; 1283 __elfN(puthdr)(td, hdr, &off, numsegs); 1284 1285 if (!gzfile) { 1286 /* Write it to the core file. */ 1287 return (vn_rdwr_inchunks(UIO_WRITE, vp, hdr, hdrsize, (off_t)0, 1288 UIO_SYSSPACE, IO_UNIT | IO_DIRECT, cred, NOCRED, NULL, 1289 td)); 1290 } else { 1291 #ifdef COMPRESS_USER_CORES 1292 if (gzwrite(gzfile, hdr, hdrsize) != hdrsize) { 1293 log(LOG_WARNING, 1294 "Failed to compress core file header for process" 1295 " %s.\n", curproc->p_comm); 1296 return (EFAULT); 1297 } 1298 else { 1299 return (0); 1300 } 1301 #else 1302 panic("shouldn't be here"); 1303 #endif 1304 } 1305 } 1306 1307 #if defined(COMPAT_FREEBSD32) && __ELF_WORD_SIZE == 32 1308 #include <compat/freebsd32/freebsd32.h> 1309 1310 typedef struct prstatus32 elf_prstatus_t; 1311 typedef struct prpsinfo32 elf_prpsinfo_t; 1312 typedef struct fpreg32 elf_prfpregset_t; 1313 typedef struct fpreg32 elf_fpregset_t; 1314 typedef struct reg32 elf_gregset_t; 1315 typedef struct thrmisc32 elf_thrmisc_t; 1316 #else 1317 typedef prstatus_t elf_prstatus_t; 1318 typedef prpsinfo_t elf_prpsinfo_t; 1319 typedef prfpregset_t elf_prfpregset_t; 1320 typedef prfpregset_t elf_fpregset_t; 1321 typedef gregset_t elf_gregset_t; 1322 typedef thrmisc_t elf_thrmisc_t; 1323 #endif 1324 1325 static void 1326 __elfN(puthdr)(struct thread *td, void *dst, size_t *off, int numsegs) 1327 { 1328 struct { 1329 elf_prstatus_t status; 1330 elf_prfpregset_t fpregset; 1331 elf_prpsinfo_t psinfo; 1332 elf_thrmisc_t thrmisc; 1333 } *tempdata; 1334 elf_prstatus_t *status; 1335 elf_prfpregset_t *fpregset; 1336 elf_prpsinfo_t *psinfo; 1337 elf_thrmisc_t *thrmisc; 1338 struct proc *p; 1339 struct thread *thr; 1340 size_t ehoff, noteoff, notesz, phoff; 1341 1342 p = td->td_proc; 1343 1344 ehoff = *off; 1345 *off += sizeof(Elf_Ehdr); 1346 1347 phoff = *off; 1348 *off += (numsegs + 1) * sizeof(Elf_Phdr); 1349 1350 noteoff = *off; 1351 /* 1352 * Don't allocate space for the notes if we're just calculating 1353 * the size of the header. We also don't collect the data. 1354 */ 1355 if (dst != NULL) { 1356 tempdata = malloc(sizeof(*tempdata), M_TEMP, M_ZERO|M_WAITOK); 1357 status = &tempdata->status; 1358 fpregset = &tempdata->fpregset; 1359 psinfo = &tempdata->psinfo; 1360 thrmisc = &tempdata->thrmisc; 1361 } else { 1362 tempdata = NULL; 1363 status = NULL; 1364 fpregset = NULL; 1365 psinfo = NULL; 1366 thrmisc = NULL; 1367 } 1368 1369 if (dst != NULL) { 1370 psinfo->pr_version = PRPSINFO_VERSION; 1371 psinfo->pr_psinfosz = sizeof(elf_prpsinfo_t); 1372 strlcpy(psinfo->pr_fname, p->p_comm, sizeof(psinfo->pr_fname)); 1373 /* 1374 * XXX - We don't fill in the command line arguments properly 1375 * yet. 1376 */ 1377 strlcpy(psinfo->pr_psargs, p->p_comm, 1378 sizeof(psinfo->pr_psargs)); 1379 } 1380 __elfN(putnote)(dst, off, "FreeBSD", NT_PRPSINFO, psinfo, 1381 sizeof *psinfo); 1382 1383 /* 1384 * To have the debugger select the right thread (LWP) as the initial 1385 * thread, we dump the state of the thread passed to us in td first. 1386 * This is the thread that causes the core dump and thus likely to 1387 * be the right thread one wants to have selected in the debugger. 1388 */ 1389 thr = td; 1390 while (thr != NULL) { 1391 if (dst != NULL) { 1392 status->pr_version = PRSTATUS_VERSION; 1393 status->pr_statussz = sizeof(elf_prstatus_t); 1394 status->pr_gregsetsz = sizeof(elf_gregset_t); 1395 status->pr_fpregsetsz = sizeof(elf_fpregset_t); 1396 status->pr_osreldate = osreldate; 1397 status->pr_cursig = p->p_sig; 1398 status->pr_pid = thr->td_tid; 1399 #if defined(COMPAT_FREEBSD32) && __ELF_WORD_SIZE == 32 1400 fill_regs32(thr, &status->pr_reg); 1401 fill_fpregs32(thr, fpregset); 1402 #else 1403 fill_regs(thr, &status->pr_reg); 1404 fill_fpregs(thr, fpregset); 1405 #endif 1406 memset(&thrmisc->_pad, 0, sizeof (thrmisc->_pad)); 1407 strcpy(thrmisc->pr_tname, thr->td_name); 1408 } 1409 __elfN(putnote)(dst, off, "FreeBSD", NT_PRSTATUS, status, 1410 sizeof *status); 1411 __elfN(putnote)(dst, off, "FreeBSD", NT_FPREGSET, fpregset, 1412 sizeof *fpregset); 1413 __elfN(putnote)(dst, off, "FreeBSD", NT_THRMISC, thrmisc, 1414 sizeof *thrmisc); 1415 /* 1416 * Allow for MD specific notes, as well as any MD 1417 * specific preparations for writing MI notes. 1418 */ 1419 __elfN(dump_thread)(thr, dst, off); 1420 1421 thr = (thr == td) ? TAILQ_FIRST(&p->p_threads) : 1422 TAILQ_NEXT(thr, td_plist); 1423 if (thr == td) 1424 thr = TAILQ_NEXT(thr, td_plist); 1425 } 1426 1427 notesz = *off - noteoff; 1428 1429 if (dst != NULL) 1430 free(tempdata, M_TEMP); 1431 1432 /* Align up to a page boundary for the program segments. */ 1433 *off = round_page(*off); 1434 1435 if (dst != NULL) { 1436 Elf_Ehdr *ehdr; 1437 Elf_Phdr *phdr; 1438 struct phdr_closure phc; 1439 1440 /* 1441 * Fill in the ELF header. 1442 */ 1443 ehdr = (Elf_Ehdr *)((char *)dst + ehoff); 1444 ehdr->e_ident[EI_MAG0] = ELFMAG0; 1445 ehdr->e_ident[EI_MAG1] = ELFMAG1; 1446 ehdr->e_ident[EI_MAG2] = ELFMAG2; 1447 ehdr->e_ident[EI_MAG3] = ELFMAG3; 1448 ehdr->e_ident[EI_CLASS] = ELF_CLASS; 1449 ehdr->e_ident[EI_DATA] = ELF_DATA; 1450 ehdr->e_ident[EI_VERSION] = EV_CURRENT; 1451 ehdr->e_ident[EI_OSABI] = ELFOSABI_FREEBSD; 1452 ehdr->e_ident[EI_ABIVERSION] = 0; 1453 ehdr->e_ident[EI_PAD] = 0; 1454 ehdr->e_type = ET_CORE; 1455 #if defined(COMPAT_FREEBSD32) && __ELF_WORD_SIZE == 32 1456 ehdr->e_machine = ELF_ARCH32; 1457 #else 1458 ehdr->e_machine = ELF_ARCH; 1459 #endif 1460 ehdr->e_version = EV_CURRENT; 1461 ehdr->e_entry = 0; 1462 ehdr->e_phoff = phoff; 1463 ehdr->e_flags = 0; 1464 ehdr->e_ehsize = sizeof(Elf_Ehdr); 1465 ehdr->e_phentsize = sizeof(Elf_Phdr); 1466 ehdr->e_phnum = numsegs + 1; 1467 ehdr->e_shentsize = sizeof(Elf_Shdr); 1468 ehdr->e_shnum = 0; 1469 ehdr->e_shstrndx = SHN_UNDEF; 1470 1471 /* 1472 * Fill in the program header entries. 1473 */ 1474 phdr = (Elf_Phdr *)((char *)dst + phoff); 1475 1476 /* The note segement. */ 1477 phdr->p_type = PT_NOTE; 1478 phdr->p_offset = noteoff; 1479 phdr->p_vaddr = 0; 1480 phdr->p_paddr = 0; 1481 phdr->p_filesz = notesz; 1482 phdr->p_memsz = 0; 1483 phdr->p_flags = 0; 1484 phdr->p_align = 0; 1485 phdr++; 1486 1487 /* All the writable segments from the program. */ 1488 phc.phdr = phdr; 1489 phc.offset = *off; 1490 each_writable_segment(td, cb_put_phdr, &phc); 1491 } 1492 } 1493 1494 static void 1495 __elfN(putnote)(void *dst, size_t *off, const char *name, int type, 1496 const void *desc, size_t descsz) 1497 { 1498 Elf_Note note; 1499 1500 note.n_namesz = strlen(name) + 1; 1501 note.n_descsz = descsz; 1502 note.n_type = type; 1503 if (dst != NULL) 1504 bcopy(¬e, (char *)dst + *off, sizeof note); 1505 *off += sizeof note; 1506 if (dst != NULL) 1507 bcopy(name, (char *)dst + *off, note.n_namesz); 1508 *off += roundup2(note.n_namesz, sizeof(Elf_Size)); 1509 if (dst != NULL) 1510 bcopy(desc, (char *)dst + *off, note.n_descsz); 1511 *off += roundup2(note.n_descsz, sizeof(Elf_Size)); 1512 } 1513 1514 /* 1515 * Try to find the appropriate ABI-note section for checknote, 1516 * fetch the osreldate for binary from the ELF OSABI-note. Only the 1517 * first page of the image is searched, the same as for headers. 1518 */ 1519 static boolean_t 1520 __elfN(check_note)(struct image_params *imgp, Elf_Brandnote *checknote, 1521 int32_t *osrel) 1522 { 1523 const Elf_Note *note, *note0, *note_end; 1524 const Elf_Phdr *phdr, *pnote; 1525 const Elf_Ehdr *hdr; 1526 const char *note_name; 1527 int i; 1528 1529 pnote = NULL; 1530 hdr = (const Elf_Ehdr *)imgp->image_header; 1531 phdr = (const Elf_Phdr *)(imgp->image_header + hdr->e_phoff); 1532 1533 for (i = 0; i < hdr->e_phnum; i++) { 1534 if (phdr[i].p_type == PT_NOTE) { 1535 pnote = &phdr[i]; 1536 break; 1537 } 1538 } 1539 1540 if (pnote == NULL || pnote->p_offset >= PAGE_SIZE || 1541 pnote->p_offset + pnote->p_filesz >= PAGE_SIZE) 1542 return (FALSE); 1543 1544 note = note0 = (const Elf_Note *)(imgp->image_header + pnote->p_offset); 1545 note_end = (const Elf_Note *)(imgp->image_header + 1546 pnote->p_offset + pnote->p_filesz); 1547 for (i = 0; i < 100 && note >= note0 && note < note_end; i++) { 1548 if (!aligned(note, Elf32_Addr)) 1549 return (FALSE); 1550 if (note->n_namesz != checknote->hdr.n_namesz || 1551 note->n_descsz != checknote->hdr.n_descsz || 1552 note->n_type != checknote->hdr.n_type) 1553 goto nextnote; 1554 note_name = (const char *)(note + 1); 1555 if (strncmp(checknote->vendor, note_name, 1556 checknote->hdr.n_namesz) != 0) 1557 goto nextnote; 1558 1559 /* 1560 * Fetch the osreldate for binary 1561 * from the ELF OSABI-note if necessary. 1562 */ 1563 if ((checknote->flags & BN_TRANSLATE_OSREL) != 0 && 1564 checknote->trans_osrel != NULL) 1565 return (checknote->trans_osrel(note, osrel)); 1566 return (TRUE); 1567 1568 nextnote: 1569 note = (const Elf_Note *)((const char *)(note + 1) + 1570 roundup2(note->n_namesz, sizeof(Elf32_Addr)) + 1571 roundup2(note->n_descsz, sizeof(Elf32_Addr))); 1572 } 1573 1574 return (FALSE); 1575 } 1576 1577 /* 1578 * Tell kern_execve.c about it, with a little help from the linker. 1579 */ 1580 static struct execsw __elfN(execsw) = { 1581 __CONCAT(exec_, __elfN(imgact)), 1582 __XSTRING(__CONCAT(ELF, __ELF_WORD_SIZE)) 1583 }; 1584 EXEC_SET(__CONCAT(elf, __ELF_WORD_SIZE), __elfN(execsw)); 1585 1586 #ifdef COMPRESS_USER_CORES 1587 /* 1588 * Compress and write out a core segment for a user process. 1589 * 1590 * 'inbuf' is the starting address of a VM segment in the process' address 1591 * space that is to be compressed and written out to the core file. 'dest_buf' 1592 * is a buffer in the kernel's address space. The segment is copied from 1593 * 'inbuf' to 'dest_buf' first before being processed by the compression 1594 * routine gzwrite(). This copying is necessary because the content of the VM 1595 * segment may change between the compression pass and the crc-computation pass 1596 * in gzwrite(). This is because realtime threads may preempt the UNIX kernel. 1597 */ 1598 static int 1599 compress_core (gzFile file, char *inbuf, char *dest_buf, unsigned int len, 1600 struct thread *td) 1601 { 1602 int len_compressed; 1603 int error = 0; 1604 unsigned int chunk_len; 1605 1606 while (len) { 1607 chunk_len = (len > CORE_BUF_SIZE) ? CORE_BUF_SIZE : len; 1608 copyin(inbuf, dest_buf, chunk_len); 1609 len_compressed = gzwrite(file, dest_buf, chunk_len); 1610 1611 EVENTHANDLER_INVOKE(app_coredump_progress, td, len_compressed); 1612 1613 if ((unsigned int)len_compressed != chunk_len) { 1614 log(LOG_WARNING, 1615 "compress_core: length mismatch (0x%x returned, " 1616 "0x%x expected)\n", len_compressed, chunk_len); 1617 EVENTHANDLER_INVOKE(app_coredump_error, td, 1618 "compress_core: length mismatch %x -> %x", 1619 chunk_len, len_compressed); 1620 error = EFAULT; 1621 break; 1622 } 1623 inbuf += chunk_len; 1624 len -= chunk_len; 1625 if (ticks - PCPU_GET(switchticks) >= hogticks) 1626 uio_yield(); 1627 } 1628 1629 return (error); 1630 } 1631 #endif /* COMPRESS_USER_CORES */ 1632 1633 static vm_prot_t 1634 __elfN(trans_prot)(Elf_Word flags) 1635 { 1636 vm_prot_t prot; 1637 1638 prot = 0; 1639 if (flags & PF_X) 1640 prot |= VM_PROT_EXECUTE; 1641 if (flags & PF_W) 1642 prot |= VM_PROT_WRITE; 1643 if (flags & PF_R) 1644 prot |= VM_PROT_READ; 1645 return (prot); 1646 } 1647 1648 static Elf_Word 1649 __elfN(untrans_prot)(vm_prot_t prot) 1650 { 1651 Elf_Word flags; 1652 1653 flags = 0; 1654 if (prot & VM_PROT_EXECUTE) 1655 flags |= PF_X; 1656 if (prot & VM_PROT_READ) 1657 flags |= PF_R; 1658 if (prot & VM_PROT_WRITE) 1659 flags |= PF_W; 1660 return (flags); 1661 } 1662