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