1 /*- 2 * Copyright (c) 2000 David O'Brien 3 * Copyright (c) 1995-1996 Søren 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_capsicum.h" 35 #include "opt_compat.h" 36 #include "opt_gzio.h" 37 38 #include <sys/param.h> 39 #include <sys/capsicum.h> 40 #include <sys/exec.h> 41 #include <sys/fcntl.h> 42 #include <sys/gzio.h> 43 #include <sys/imgact.h> 44 #include <sys/imgact_elf.h> 45 #include <sys/jail.h> 46 #include <sys/kernel.h> 47 #include <sys/lock.h> 48 #include <sys/malloc.h> 49 #include <sys/mount.h> 50 #include <sys/mman.h> 51 #include <sys/namei.h> 52 #include <sys/pioctl.h> 53 #include <sys/proc.h> 54 #include <sys/procfs.h> 55 #include <sys/racct.h> 56 #include <sys/resourcevar.h> 57 #include <sys/rwlock.h> 58 #include <sys/sbuf.h> 59 #include <sys/sf_buf.h> 60 #include <sys/smp.h> 61 #include <sys/systm.h> 62 #include <sys/signalvar.h> 63 #include <sys/stat.h> 64 #include <sys/sx.h> 65 #include <sys/syscall.h> 66 #include <sys/sysctl.h> 67 #include <sys/sysent.h> 68 #include <sys/vnode.h> 69 #include <sys/syslog.h> 70 #include <sys/eventhandler.h> 71 #include <sys/user.h> 72 73 #include <vm/vm.h> 74 #include <vm/vm_kern.h> 75 #include <vm/vm_param.h> 76 #include <vm/pmap.h> 77 #include <vm/vm_map.h> 78 #include <vm/vm_object.h> 79 #include <vm/vm_extern.h> 80 81 #include <machine/elf.h> 82 #include <machine/md_var.h> 83 84 #define ELF_NOTE_ROUNDSIZE 4 85 #define OLD_EI_BRAND 8 86 87 static int __elfN(check_header)(const Elf_Ehdr *hdr); 88 static Elf_Brandinfo *__elfN(get_brandinfo)(struct image_params *imgp, 89 const char *interp, int interp_name_len, int32_t *osrel); 90 static int __elfN(load_file)(struct proc *p, const char *file, u_long *addr, 91 u_long *entry, size_t pagesize); 92 static int __elfN(load_section)(struct image_params *imgp, vm_offset_t offset, 93 caddr_t vmaddr, size_t memsz, size_t filsz, vm_prot_t prot, 94 size_t pagesize); 95 static int __CONCAT(exec_, __elfN(imgact))(struct image_params *imgp); 96 static boolean_t __elfN(freebsd_trans_osrel)(const Elf_Note *note, 97 int32_t *osrel); 98 static boolean_t kfreebsd_trans_osrel(const Elf_Note *note, int32_t *osrel); 99 static boolean_t __elfN(check_note)(struct image_params *imgp, 100 Elf_Brandnote *checknote, int32_t *osrel); 101 static vm_prot_t __elfN(trans_prot)(Elf_Word); 102 static Elf_Word __elfN(untrans_prot)(vm_prot_t); 103 104 SYSCTL_NODE(_kern, OID_AUTO, __CONCAT(elf, __ELF_WORD_SIZE), CTLFLAG_RW, 0, 105 ""); 106 107 #define CORE_BUF_SIZE (16 * 1024) 108 109 int __elfN(fallback_brand) = -1; 110 SYSCTL_INT(__CONCAT(_kern_elf, __ELF_WORD_SIZE), OID_AUTO, 111 fallback_brand, CTLFLAG_RWTUN, &__elfN(fallback_brand), 0, 112 __XSTRING(__CONCAT(ELF, __ELF_WORD_SIZE)) " brand of last resort"); 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 int __elfN(nxstack) = 119 #if defined(__amd64__) || defined(__powerpc64__) /* both 64 and 32 bit */ 120 1; 121 #else 122 0; 123 #endif 124 SYSCTL_INT(__CONCAT(_kern_elf, __ELF_WORD_SIZE), OID_AUTO, 125 nxstack, CTLFLAG_RW, &__elfN(nxstack), 0, 126 __XSTRING(__CONCAT(ELF, __ELF_WORD_SIZE)) ": enable non-executable stack"); 127 128 #if __ELF_WORD_SIZE == 32 129 #if defined(__amd64__) 130 int i386_read_exec = 0; 131 SYSCTL_INT(_kern_elf32, OID_AUTO, read_exec, CTLFLAG_RW, &i386_read_exec, 0, 132 "enable execution from readable segments"); 133 #endif 134 #endif 135 136 static Elf_Brandinfo *elf_brand_list[MAX_BRANDS]; 137 138 #define trunc_page_ps(va, ps) ((va) & ~(ps - 1)) 139 #define round_page_ps(va, ps) (((va) + (ps - 1)) & ~(ps - 1)) 140 #define aligned(a, t) (trunc_page_ps((u_long)(a), sizeof(t)) == (u_long)(a)) 141 142 static const char FREEBSD_ABI_VENDOR[] = "FreeBSD"; 143 144 Elf_Brandnote __elfN(freebsd_brandnote) = { 145 .hdr.n_namesz = sizeof(FREEBSD_ABI_VENDOR), 146 .hdr.n_descsz = sizeof(int32_t), 147 .hdr.n_type = 1, 148 .vendor = FREEBSD_ABI_VENDOR, 149 .flags = BN_TRANSLATE_OSREL, 150 .trans_osrel = __elfN(freebsd_trans_osrel) 151 }; 152 153 static boolean_t 154 __elfN(freebsd_trans_osrel)(const Elf_Note *note, int32_t *osrel) 155 { 156 uintptr_t p; 157 158 p = (uintptr_t)(note + 1); 159 p += roundup2(note->n_namesz, ELF_NOTE_ROUNDSIZE); 160 *osrel = *(const int32_t *)(p); 161 162 return (TRUE); 163 } 164 165 static const char GNU_ABI_VENDOR[] = "GNU"; 166 static int GNU_KFREEBSD_ABI_DESC = 3; 167 168 Elf_Brandnote __elfN(kfreebsd_brandnote) = { 169 .hdr.n_namesz = sizeof(GNU_ABI_VENDOR), 170 .hdr.n_descsz = 16, /* XXX at least 16 */ 171 .hdr.n_type = 1, 172 .vendor = GNU_ABI_VENDOR, 173 .flags = BN_TRANSLATE_OSREL, 174 .trans_osrel = kfreebsd_trans_osrel 175 }; 176 177 static boolean_t 178 kfreebsd_trans_osrel(const Elf_Note *note, int32_t *osrel) 179 { 180 const Elf32_Word *desc; 181 uintptr_t p; 182 183 p = (uintptr_t)(note + 1); 184 p += roundup2(note->n_namesz, ELF_NOTE_ROUNDSIZE); 185 186 desc = (const Elf32_Word *)p; 187 if (desc[0] != GNU_KFREEBSD_ABI_DESC) 188 return (FALSE); 189 190 /* 191 * Debian GNU/kFreeBSD embed the earliest compatible kernel version 192 * (__FreeBSD_version: <major><two digit minor>Rxx) in the LSB way. 193 */ 194 *osrel = desc[1] * 100000 + desc[2] * 1000 + desc[3]; 195 196 return (TRUE); 197 } 198 199 int 200 __elfN(insert_brand_entry)(Elf_Brandinfo *entry) 201 { 202 int i; 203 204 for (i = 0; i < MAX_BRANDS; i++) { 205 if (elf_brand_list[i] == NULL) { 206 elf_brand_list[i] = entry; 207 break; 208 } 209 } 210 if (i == MAX_BRANDS) { 211 printf("WARNING: %s: could not insert brandinfo entry: %p\n", 212 __func__, entry); 213 return (-1); 214 } 215 return (0); 216 } 217 218 int 219 __elfN(remove_brand_entry)(Elf_Brandinfo *entry) 220 { 221 int i; 222 223 for (i = 0; i < MAX_BRANDS; i++) { 224 if (elf_brand_list[i] == entry) { 225 elf_brand_list[i] = NULL; 226 break; 227 } 228 } 229 if (i == MAX_BRANDS) 230 return (-1); 231 return (0); 232 } 233 234 int 235 __elfN(brand_inuse)(Elf_Brandinfo *entry) 236 { 237 struct proc *p; 238 int rval = FALSE; 239 240 sx_slock(&allproc_lock); 241 FOREACH_PROC_IN_SYSTEM(p) { 242 if (p->p_sysent == entry->sysvec) { 243 rval = TRUE; 244 break; 245 } 246 } 247 sx_sunlock(&allproc_lock); 248 249 return (rval); 250 } 251 252 static Elf_Brandinfo * 253 __elfN(get_brandinfo)(struct image_params *imgp, const char *interp, 254 int interp_name_len, int32_t *osrel) 255 { 256 const Elf_Ehdr *hdr = (const Elf_Ehdr *)imgp->image_header; 257 Elf_Brandinfo *bi; 258 boolean_t ret; 259 int i; 260 261 /* 262 * We support four types of branding -- (1) the ELF EI_OSABI field 263 * that SCO added to the ELF spec, (2) FreeBSD 3.x's traditional string 264 * branding w/in the ELF header, (3) path of the `interp_path' 265 * field, and (4) the ".note.ABI-tag" ELF section. 266 */ 267 268 /* Look for an ".note.ABI-tag" ELF section */ 269 for (i = 0; i < MAX_BRANDS; i++) { 270 bi = elf_brand_list[i]; 271 if (bi == NULL) 272 continue; 273 if (hdr->e_machine == bi->machine && (bi->flags & 274 (BI_BRAND_NOTE|BI_BRAND_NOTE_MANDATORY)) != 0) { 275 ret = __elfN(check_note)(imgp, bi->brand_note, osrel); 276 if (ret) 277 return (bi); 278 } 279 } 280 281 /* If the executable has a brand, search for it in the brand list. */ 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 (hdr->e_ident[EI_OSABI] == bi->brand || 288 strncmp((const char *)&hdr->e_ident[OLD_EI_BRAND], 289 bi->compat_3_brand, strlen(bi->compat_3_brand)) == 0)) 290 return (bi); 291 } 292 293 /* No known brand, see if the header is recognized by any brand */ 294 for (i = 0; i < MAX_BRANDS; i++) { 295 bi = elf_brand_list[i]; 296 if (bi == NULL || bi->flags & BI_BRAND_NOTE_MANDATORY || 297 bi->header_supported == NULL) 298 continue; 299 if (hdr->e_machine == bi->machine) { 300 ret = bi->header_supported(imgp); 301 if (ret) 302 return (bi); 303 } 304 } 305 306 /* Lacking a known brand, search for a recognized interpreter. */ 307 if (interp != NULL) { 308 for (i = 0; i < MAX_BRANDS; i++) { 309 bi = elf_brand_list[i]; 310 if (bi == NULL || bi->flags & BI_BRAND_NOTE_MANDATORY) 311 continue; 312 if (hdr->e_machine == bi->machine && 313 /* ELF image p_filesz includes terminating zero */ 314 strlen(bi->interp_path) + 1 == interp_name_len && 315 strncmp(interp, bi->interp_path, interp_name_len) 316 == 0) 317 return (bi); 318 } 319 } 320 321 /* Lacking a recognized interpreter, try the default brand */ 322 for (i = 0; i < MAX_BRANDS; i++) { 323 bi = elf_brand_list[i]; 324 if (bi == NULL || bi->flags & BI_BRAND_NOTE_MANDATORY) 325 continue; 326 if (hdr->e_machine == bi->machine && 327 __elfN(fallback_brand) == bi->brand) 328 return (bi); 329 } 330 return (NULL); 331 } 332 333 static int 334 __elfN(check_header)(const Elf_Ehdr *hdr) 335 { 336 Elf_Brandinfo *bi; 337 int i; 338 339 if (!IS_ELF(*hdr) || 340 hdr->e_ident[EI_CLASS] != ELF_TARG_CLASS || 341 hdr->e_ident[EI_DATA] != ELF_TARG_DATA || 342 hdr->e_ident[EI_VERSION] != EV_CURRENT || 343 hdr->e_phentsize != sizeof(Elf_Phdr) || 344 hdr->e_version != ELF_TARG_VER) 345 return (ENOEXEC); 346 347 /* 348 * Make sure we have at least one brand for this machine. 349 */ 350 351 for (i = 0; i < MAX_BRANDS; i++) { 352 bi = elf_brand_list[i]; 353 if (bi != NULL && bi->machine == hdr->e_machine) 354 break; 355 } 356 if (i == MAX_BRANDS) 357 return (ENOEXEC); 358 359 return (0); 360 } 361 362 static int 363 __elfN(map_partial)(vm_map_t map, vm_object_t object, vm_ooffset_t offset, 364 vm_offset_t start, vm_offset_t end, vm_prot_t prot) 365 { 366 struct sf_buf *sf; 367 int error; 368 vm_offset_t off; 369 370 /* 371 * Create the page if it doesn't exist yet. Ignore errors. 372 */ 373 vm_map_lock(map); 374 vm_map_insert(map, NULL, 0, trunc_page(start), round_page(end), 375 VM_PROT_ALL, VM_PROT_ALL, 0); 376 vm_map_unlock(map); 377 378 /* 379 * Find the page from the underlying object. 380 */ 381 if (object) { 382 sf = vm_imgact_map_page(object, offset); 383 if (sf == NULL) 384 return (KERN_FAILURE); 385 off = offset - trunc_page(offset); 386 error = copyout((caddr_t)sf_buf_kva(sf) + off, (caddr_t)start, 387 end - start); 388 vm_imgact_unmap_page(sf); 389 if (error) { 390 return (KERN_FAILURE); 391 } 392 } 393 394 return (KERN_SUCCESS); 395 } 396 397 static int 398 __elfN(map_insert)(vm_map_t map, vm_object_t object, vm_ooffset_t offset, 399 vm_offset_t start, vm_offset_t end, vm_prot_t prot, int cow) 400 { 401 struct sf_buf *sf; 402 vm_offset_t off; 403 vm_size_t sz; 404 int error, rv; 405 406 if (start != trunc_page(start)) { 407 rv = __elfN(map_partial)(map, object, offset, start, 408 round_page(start), prot); 409 if (rv) 410 return (rv); 411 offset += round_page(start) - start; 412 start = round_page(start); 413 } 414 if (end != round_page(end)) { 415 rv = __elfN(map_partial)(map, object, offset + 416 trunc_page(end) - start, trunc_page(end), end, prot); 417 if (rv) 418 return (rv); 419 end = trunc_page(end); 420 } 421 if (end > start) { 422 if (offset & PAGE_MASK) { 423 /* 424 * The mapping is not page aligned. This means we have 425 * to copy the data. Sigh. 426 */ 427 rv = vm_map_find(map, NULL, 0, &start, end - start, 0, 428 VMFS_NO_SPACE, prot | VM_PROT_WRITE, VM_PROT_ALL, 429 0); 430 if (rv) 431 return (rv); 432 if (object == NULL) 433 return (KERN_SUCCESS); 434 for (; start < end; start += sz) { 435 sf = vm_imgact_map_page(object, offset); 436 if (sf == NULL) 437 return (KERN_FAILURE); 438 off = offset - trunc_page(offset); 439 sz = end - start; 440 if (sz > PAGE_SIZE - off) 441 sz = PAGE_SIZE - off; 442 error = copyout((caddr_t)sf_buf_kva(sf) + off, 443 (caddr_t)start, sz); 444 vm_imgact_unmap_page(sf); 445 if (error) { 446 return (KERN_FAILURE); 447 } 448 offset += sz; 449 } 450 rv = KERN_SUCCESS; 451 } else { 452 vm_object_reference(object); 453 vm_map_lock(map); 454 rv = vm_map_insert(map, object, offset, start, end, 455 prot, VM_PROT_ALL, cow); 456 vm_map_unlock(map); 457 if (rv != KERN_SUCCESS) 458 vm_object_deallocate(object); 459 } 460 return (rv); 461 } else { 462 return (KERN_SUCCESS); 463 } 464 } 465 466 static int 467 __elfN(load_section)(struct image_params *imgp, vm_offset_t offset, 468 caddr_t vmaddr, size_t memsz, size_t filsz, vm_prot_t prot, 469 size_t pagesize) 470 { 471 struct sf_buf *sf; 472 size_t map_len; 473 vm_map_t map; 474 vm_object_t object; 475 vm_offset_t map_addr; 476 int error, rv, cow; 477 size_t copy_len; 478 vm_offset_t file_addr; 479 480 /* 481 * It's necessary to fail if the filsz + offset taken from the 482 * header is greater than the actual file pager object's size. 483 * If we were to allow this, then the vm_map_find() below would 484 * walk right off the end of the file object and into the ether. 485 * 486 * While I'm here, might as well check for something else that 487 * is invalid: filsz cannot be greater than memsz. 488 */ 489 if ((off_t)filsz + offset > imgp->attr->va_size || filsz > memsz) { 490 uprintf("elf_load_section: truncated ELF file\n"); 491 return (ENOEXEC); 492 } 493 494 object = imgp->object; 495 map = &imgp->proc->p_vmspace->vm_map; 496 map_addr = trunc_page_ps((vm_offset_t)vmaddr, pagesize); 497 file_addr = trunc_page_ps(offset, pagesize); 498 499 /* 500 * We have two choices. We can either clear the data in the last page 501 * of an oversized mapping, or we can start the anon mapping a page 502 * early and copy the initialized data into that first page. We 503 * choose the second.. 504 */ 505 if (memsz > filsz) 506 map_len = trunc_page_ps(offset + filsz, pagesize) - file_addr; 507 else 508 map_len = round_page_ps(offset + filsz, pagesize) - file_addr; 509 510 if (map_len != 0) { 511 /* cow flags: don't dump readonly sections in core */ 512 cow = MAP_COPY_ON_WRITE | MAP_PREFAULT | 513 (prot & VM_PROT_WRITE ? 0 : MAP_DISABLE_COREDUMP); 514 515 rv = __elfN(map_insert)(map, 516 object, 517 file_addr, /* file offset */ 518 map_addr, /* virtual start */ 519 map_addr + map_len,/* virtual end */ 520 prot, 521 cow); 522 if (rv != KERN_SUCCESS) 523 return (EINVAL); 524 525 /* we can stop now if we've covered it all */ 526 if (memsz == filsz) { 527 return (0); 528 } 529 } 530 531 532 /* 533 * We have to get the remaining bit of the file into the first part 534 * of the oversized map segment. This is normally because the .data 535 * segment in the file is extended to provide bss. It's a neat idea 536 * to try and save a page, but it's a pain in the behind to implement. 537 */ 538 copy_len = (offset + filsz) - trunc_page_ps(offset + filsz, pagesize); 539 map_addr = trunc_page_ps((vm_offset_t)vmaddr + filsz, pagesize); 540 map_len = round_page_ps((vm_offset_t)vmaddr + memsz, pagesize) - 541 map_addr; 542 543 /* This had damn well better be true! */ 544 if (map_len != 0) { 545 rv = __elfN(map_insert)(map, NULL, 0, map_addr, map_addr + 546 map_len, VM_PROT_ALL, 0); 547 if (rv != KERN_SUCCESS) { 548 return (EINVAL); 549 } 550 } 551 552 if (copy_len != 0) { 553 vm_offset_t off; 554 555 sf = vm_imgact_map_page(object, offset + filsz); 556 if (sf == NULL) 557 return (EIO); 558 559 /* send the page fragment to user space */ 560 off = trunc_page_ps(offset + filsz, pagesize) - 561 trunc_page(offset + filsz); 562 error = copyout((caddr_t)sf_buf_kva(sf) + off, 563 (caddr_t)map_addr, copy_len); 564 vm_imgact_unmap_page(sf); 565 if (error) { 566 return (error); 567 } 568 } 569 570 /* 571 * set it to the specified protection. 572 * XXX had better undo the damage from pasting over the cracks here! 573 */ 574 vm_map_protect(map, trunc_page(map_addr), round_page(map_addr + 575 map_len), prot, FALSE); 576 577 return (0); 578 } 579 580 /* 581 * Load the file "file" into memory. It may be either a shared object 582 * or an executable. 583 * 584 * The "addr" reference parameter is in/out. On entry, it specifies 585 * the address where a shared object should be loaded. If the file is 586 * an executable, this value is ignored. On exit, "addr" specifies 587 * where the file was actually loaded. 588 * 589 * The "entry" reference parameter is out only. On exit, it specifies 590 * the entry point for the loaded file. 591 */ 592 static int 593 __elfN(load_file)(struct proc *p, const char *file, u_long *addr, 594 u_long *entry, size_t pagesize) 595 { 596 struct { 597 struct nameidata nd; 598 struct vattr attr; 599 struct image_params image_params; 600 } *tempdata; 601 const Elf_Ehdr *hdr = NULL; 602 const Elf_Phdr *phdr = NULL; 603 struct nameidata *nd; 604 struct vattr *attr; 605 struct image_params *imgp; 606 vm_prot_t prot; 607 u_long rbase; 608 u_long base_addr = 0; 609 int error, i, numsegs; 610 611 #ifdef CAPABILITY_MODE 612 /* 613 * XXXJA: This check can go away once we are sufficiently confident 614 * that the checks in namei() are correct. 615 */ 616 if (IN_CAPABILITY_MODE(curthread)) 617 return (ECAPMODE); 618 #endif 619 620 tempdata = malloc(sizeof(*tempdata), M_TEMP, M_WAITOK); 621 nd = &tempdata->nd; 622 attr = &tempdata->attr; 623 imgp = &tempdata->image_params; 624 625 /* 626 * Initialize part of the common data 627 */ 628 imgp->proc = p; 629 imgp->attr = attr; 630 imgp->firstpage = NULL; 631 imgp->image_header = NULL; 632 imgp->object = NULL; 633 imgp->execlabel = NULL; 634 635 NDINIT(nd, LOOKUP, LOCKLEAF | FOLLOW, UIO_SYSSPACE, file, curthread); 636 if ((error = namei(nd)) != 0) { 637 nd->ni_vp = NULL; 638 goto fail; 639 } 640 NDFREE(nd, NDF_ONLY_PNBUF); 641 imgp->vp = nd->ni_vp; 642 643 /* 644 * Check permissions, modes, uid, etc on the file, and "open" it. 645 */ 646 error = exec_check_permissions(imgp); 647 if (error) 648 goto fail; 649 650 error = exec_map_first_page(imgp); 651 if (error) 652 goto fail; 653 654 /* 655 * Also make certain that the interpreter stays the same, so set 656 * its VV_TEXT flag, too. 657 */ 658 VOP_SET_TEXT(nd->ni_vp); 659 660 imgp->object = nd->ni_vp->v_object; 661 662 hdr = (const Elf_Ehdr *)imgp->image_header; 663 if ((error = __elfN(check_header)(hdr)) != 0) 664 goto fail; 665 if (hdr->e_type == ET_DYN) 666 rbase = *addr; 667 else if (hdr->e_type == ET_EXEC) 668 rbase = 0; 669 else { 670 error = ENOEXEC; 671 goto fail; 672 } 673 674 /* Only support headers that fit within first page for now */ 675 if ((hdr->e_phoff > PAGE_SIZE) || 676 (u_int)hdr->e_phentsize * hdr->e_phnum > PAGE_SIZE - hdr->e_phoff) { 677 error = ENOEXEC; 678 goto fail; 679 } 680 681 phdr = (const Elf_Phdr *)(imgp->image_header + hdr->e_phoff); 682 if (!aligned(phdr, Elf_Addr)) { 683 error = ENOEXEC; 684 goto fail; 685 } 686 687 for (i = 0, numsegs = 0; i < hdr->e_phnum; i++) { 688 if (phdr[i].p_type == PT_LOAD && phdr[i].p_memsz != 0) { 689 /* Loadable segment */ 690 prot = __elfN(trans_prot)(phdr[i].p_flags); 691 error = __elfN(load_section)(imgp, phdr[i].p_offset, 692 (caddr_t)(uintptr_t)phdr[i].p_vaddr + rbase, 693 phdr[i].p_memsz, phdr[i].p_filesz, prot, pagesize); 694 if (error != 0) 695 goto fail; 696 /* 697 * Establish the base address if this is the 698 * first segment. 699 */ 700 if (numsegs == 0) 701 base_addr = trunc_page(phdr[i].p_vaddr + 702 rbase); 703 numsegs++; 704 } 705 } 706 *addr = base_addr; 707 *entry = (unsigned long)hdr->e_entry + rbase; 708 709 fail: 710 if (imgp->firstpage) 711 exec_unmap_first_page(imgp); 712 713 if (nd->ni_vp) 714 vput(nd->ni_vp); 715 716 free(tempdata, M_TEMP); 717 718 return (error); 719 } 720 721 static int 722 __CONCAT(exec_, __elfN(imgact))(struct image_params *imgp) 723 { 724 struct thread *td; 725 const Elf_Ehdr *hdr; 726 const Elf_Phdr *phdr; 727 Elf_Auxargs *elf_auxargs; 728 struct vmspace *vmspace; 729 const char *err_str, *newinterp; 730 char *interp, *interp_buf, *path; 731 Elf_Brandinfo *brand_info; 732 struct sysentvec *sv; 733 vm_prot_t prot; 734 u_long text_size, data_size, total_size, text_addr, data_addr; 735 u_long seg_size, seg_addr, addr, baddr, et_dyn_addr, entry, proghdr; 736 int32_t osrel; 737 int error, i, n, interp_name_len, have_interp; 738 739 hdr = (const Elf_Ehdr *)imgp->image_header; 740 741 /* 742 * Do we have a valid ELF header ? 743 * 744 * Only allow ET_EXEC & ET_DYN here, reject ET_DYN later 745 * if particular brand doesn't support it. 746 */ 747 if (__elfN(check_header)(hdr) != 0 || 748 (hdr->e_type != ET_EXEC && hdr->e_type != ET_DYN)) 749 return (-1); 750 751 /* 752 * From here on down, we return an errno, not -1, as we've 753 * detected an ELF file. 754 */ 755 756 if ((hdr->e_phoff > PAGE_SIZE) || 757 (u_int)hdr->e_phentsize * hdr->e_phnum > PAGE_SIZE - hdr->e_phoff) { 758 /* Only support headers in first page for now */ 759 uprintf("Program headers not in the first page\n"); 760 return (ENOEXEC); 761 } 762 phdr = (const Elf_Phdr *)(imgp->image_header + hdr->e_phoff); 763 if (!aligned(phdr, Elf_Addr)) { 764 uprintf("Unaligned program headers\n"); 765 return (ENOEXEC); 766 } 767 768 n = error = 0; 769 baddr = 0; 770 osrel = 0; 771 text_size = data_size = total_size = text_addr = data_addr = 0; 772 entry = proghdr = 0; 773 interp_name_len = 0; 774 err_str = newinterp = NULL; 775 interp = interp_buf = NULL; 776 td = curthread; 777 778 for (i = 0; i < hdr->e_phnum; i++) { 779 switch (phdr[i].p_type) { 780 case PT_LOAD: 781 if (n == 0) 782 baddr = phdr[i].p_vaddr; 783 n++; 784 break; 785 case PT_INTERP: 786 /* Path to interpreter */ 787 if (phdr[i].p_filesz > MAXPATHLEN) { 788 uprintf("Invalid PT_INTERP\n"); 789 error = ENOEXEC; 790 goto ret; 791 } 792 interp_name_len = phdr[i].p_filesz; 793 if (phdr[i].p_offset > PAGE_SIZE || 794 interp_name_len > PAGE_SIZE - phdr[i].p_offset) { 795 VOP_UNLOCK(imgp->vp, 0); 796 interp_buf = malloc(interp_name_len + 1, M_TEMP, 797 M_WAITOK); 798 vn_lock(imgp->vp, LK_EXCLUSIVE | LK_RETRY); 799 error = vn_rdwr(UIO_READ, imgp->vp, interp_buf, 800 interp_name_len, phdr[i].p_offset, 801 UIO_SYSSPACE, IO_NODELOCKED, td->td_ucred, 802 NOCRED, NULL, td); 803 if (error != 0) { 804 uprintf("i/o error PT_INTERP\n"); 805 goto ret; 806 } 807 interp_buf[interp_name_len] = '\0'; 808 interp = interp_buf; 809 } else { 810 interp = __DECONST(char *, imgp->image_header) + 811 phdr[i].p_offset; 812 } 813 break; 814 case PT_GNU_STACK: 815 if (__elfN(nxstack)) 816 imgp->stack_prot = 817 __elfN(trans_prot)(phdr[i].p_flags); 818 imgp->stack_sz = phdr[i].p_memsz; 819 break; 820 } 821 } 822 823 brand_info = __elfN(get_brandinfo)(imgp, interp, interp_name_len, 824 &osrel); 825 if (brand_info == NULL) { 826 uprintf("ELF binary type \"%u\" not known.\n", 827 hdr->e_ident[EI_OSABI]); 828 error = ENOEXEC; 829 goto ret; 830 } 831 if (hdr->e_type == ET_DYN) { 832 if ((brand_info->flags & BI_CAN_EXEC_DYN) == 0) { 833 uprintf("Cannot execute shared object\n"); 834 error = ENOEXEC; 835 goto ret; 836 } 837 /* 838 * Honour the base load address from the dso if it is 839 * non-zero for some reason. 840 */ 841 if (baddr == 0) 842 et_dyn_addr = ET_DYN_LOAD_ADDR; 843 else 844 et_dyn_addr = 0; 845 } else 846 et_dyn_addr = 0; 847 sv = brand_info->sysvec; 848 if (interp != NULL && brand_info->interp_newpath != NULL) 849 newinterp = brand_info->interp_newpath; 850 851 /* 852 * Avoid a possible deadlock if the current address space is destroyed 853 * and that address space maps the locked vnode. In the common case, 854 * the locked vnode's v_usecount is decremented but remains greater 855 * than zero. Consequently, the vnode lock is not needed by vrele(). 856 * However, in cases where the vnode lock is external, such as nullfs, 857 * v_usecount may become zero. 858 * 859 * The VV_TEXT flag prevents modifications to the executable while 860 * the vnode is unlocked. 861 */ 862 VOP_UNLOCK(imgp->vp, 0); 863 864 error = exec_new_vmspace(imgp, sv); 865 imgp->proc->p_sysent = sv; 866 867 vn_lock(imgp->vp, LK_EXCLUSIVE | LK_RETRY); 868 if (error != 0) 869 goto ret; 870 871 for (i = 0; i < hdr->e_phnum; i++) { 872 switch (phdr[i].p_type) { 873 case PT_LOAD: /* Loadable segment */ 874 if (phdr[i].p_memsz == 0) 875 break; 876 prot = __elfN(trans_prot)(phdr[i].p_flags); 877 error = __elfN(load_section)(imgp, phdr[i].p_offset, 878 (caddr_t)(uintptr_t)phdr[i].p_vaddr + et_dyn_addr, 879 phdr[i].p_memsz, phdr[i].p_filesz, prot, 880 sv->sv_pagesize); 881 if (error != 0) 882 goto ret; 883 884 /* 885 * If this segment contains the program headers, 886 * remember their virtual address for the AT_PHDR 887 * aux entry. Static binaries don't usually include 888 * a PT_PHDR entry. 889 */ 890 if (phdr[i].p_offset == 0 && 891 hdr->e_phoff + hdr->e_phnum * hdr->e_phentsize 892 <= phdr[i].p_filesz) 893 proghdr = phdr[i].p_vaddr + hdr->e_phoff + 894 et_dyn_addr; 895 896 seg_addr = trunc_page(phdr[i].p_vaddr + et_dyn_addr); 897 seg_size = round_page(phdr[i].p_memsz + 898 phdr[i].p_vaddr + et_dyn_addr - seg_addr); 899 900 /* 901 * Make the largest executable segment the official 902 * text segment and all others data. 903 * 904 * Note that obreak() assumes that data_addr + 905 * data_size == end of data load area, and the ELF 906 * file format expects segments to be sorted by 907 * address. If multiple data segments exist, the 908 * last one will be used. 909 */ 910 911 if (phdr[i].p_flags & PF_X && text_size < seg_size) { 912 text_size = seg_size; 913 text_addr = seg_addr; 914 } else { 915 data_size = seg_size; 916 data_addr = seg_addr; 917 } 918 total_size += seg_size; 919 break; 920 case PT_PHDR: /* Program header table info */ 921 proghdr = phdr[i].p_vaddr + et_dyn_addr; 922 break; 923 default: 924 break; 925 } 926 } 927 928 if (data_addr == 0 && data_size == 0) { 929 data_addr = text_addr; 930 data_size = text_size; 931 } 932 933 entry = (u_long)hdr->e_entry + et_dyn_addr; 934 935 /* 936 * Check limits. It should be safe to check the 937 * limits after loading the segments since we do 938 * not actually fault in all the segments pages. 939 */ 940 PROC_LOCK(imgp->proc); 941 if (data_size > lim_cur_proc(imgp->proc, RLIMIT_DATA)) 942 err_str = "Data segment size exceeds process limit"; 943 else if (text_size > maxtsiz) 944 err_str = "Text segment size exceeds system limit"; 945 else if (total_size > lim_cur_proc(imgp->proc, RLIMIT_VMEM)) 946 err_str = "Total segment size exceeds process limit"; 947 else if (racct_set(imgp->proc, RACCT_DATA, data_size) != 0) 948 err_str = "Data segment size exceeds resource limit"; 949 else if (racct_set(imgp->proc, RACCT_VMEM, total_size) != 0) 950 err_str = "Total segment size exceeds resource limit"; 951 if (err_str != NULL) { 952 PROC_UNLOCK(imgp->proc); 953 uprintf("%s\n", err_str); 954 error = ENOMEM; 955 goto ret; 956 } 957 958 vmspace = imgp->proc->p_vmspace; 959 vmspace->vm_tsize = text_size >> PAGE_SHIFT; 960 vmspace->vm_taddr = (caddr_t)(uintptr_t)text_addr; 961 vmspace->vm_dsize = data_size >> PAGE_SHIFT; 962 vmspace->vm_daddr = (caddr_t)(uintptr_t)data_addr; 963 964 /* 965 * We load the dynamic linker where a userland call 966 * to mmap(0, ...) would put it. The rationale behind this 967 * calculation is that it leaves room for the heap to grow to 968 * its maximum allowed size. 969 */ 970 addr = round_page((vm_offset_t)vmspace->vm_daddr + lim_max(td, 971 RLIMIT_DATA)); 972 PROC_UNLOCK(imgp->proc); 973 974 imgp->entry_addr = entry; 975 976 if (interp != NULL) { 977 have_interp = FALSE; 978 VOP_UNLOCK(imgp->vp, 0); 979 if (brand_info->emul_path != NULL && 980 brand_info->emul_path[0] != '\0') { 981 path = malloc(MAXPATHLEN, M_TEMP, M_WAITOK); 982 snprintf(path, MAXPATHLEN, "%s%s", 983 brand_info->emul_path, interp); 984 error = __elfN(load_file)(imgp->proc, path, &addr, 985 &imgp->entry_addr, sv->sv_pagesize); 986 free(path, M_TEMP); 987 if (error == 0) 988 have_interp = TRUE; 989 } 990 if (!have_interp && newinterp != NULL) { 991 error = __elfN(load_file)(imgp->proc, newinterp, &addr, 992 &imgp->entry_addr, sv->sv_pagesize); 993 if (error == 0) 994 have_interp = TRUE; 995 } 996 if (!have_interp) { 997 error = __elfN(load_file)(imgp->proc, interp, &addr, 998 &imgp->entry_addr, sv->sv_pagesize); 999 } 1000 vn_lock(imgp->vp, LK_EXCLUSIVE | LK_RETRY); 1001 if (error != 0) { 1002 uprintf("ELF interpreter %s not found\n", interp); 1003 goto ret; 1004 } 1005 } else 1006 addr = et_dyn_addr; 1007 1008 /* 1009 * Construct auxargs table (used by the fixup routine) 1010 */ 1011 elf_auxargs = malloc(sizeof(Elf_Auxargs), M_TEMP, M_WAITOK); 1012 elf_auxargs->execfd = -1; 1013 elf_auxargs->phdr = proghdr; 1014 elf_auxargs->phent = hdr->e_phentsize; 1015 elf_auxargs->phnum = hdr->e_phnum; 1016 elf_auxargs->pagesz = PAGE_SIZE; 1017 elf_auxargs->base = addr; 1018 elf_auxargs->flags = 0; 1019 elf_auxargs->entry = entry; 1020 elf_auxargs->hdr_eflags = hdr->e_flags; 1021 1022 imgp->auxargs = elf_auxargs; 1023 imgp->interpreted = 0; 1024 imgp->reloc_base = addr; 1025 imgp->proc->p_osrel = osrel; 1026 1027 ret: 1028 free(interp_buf, M_TEMP); 1029 return (error); 1030 } 1031 1032 #define suword __CONCAT(suword, __ELF_WORD_SIZE) 1033 1034 int 1035 __elfN(freebsd_fixup)(register_t **stack_base, struct image_params *imgp) 1036 { 1037 Elf_Auxargs *args = (Elf_Auxargs *)imgp->auxargs; 1038 Elf_Addr *base; 1039 Elf_Addr *pos; 1040 1041 base = (Elf_Addr *)*stack_base; 1042 pos = base + (imgp->args->argc + imgp->args->envc + 2); 1043 1044 if (args->execfd != -1) 1045 AUXARGS_ENTRY(pos, AT_EXECFD, args->execfd); 1046 AUXARGS_ENTRY(pos, AT_PHDR, args->phdr); 1047 AUXARGS_ENTRY(pos, AT_PHENT, args->phent); 1048 AUXARGS_ENTRY(pos, AT_PHNUM, args->phnum); 1049 AUXARGS_ENTRY(pos, AT_PAGESZ, args->pagesz); 1050 AUXARGS_ENTRY(pos, AT_FLAGS, args->flags); 1051 AUXARGS_ENTRY(pos, AT_ENTRY, args->entry); 1052 AUXARGS_ENTRY(pos, AT_BASE, args->base); 1053 #ifdef AT_EHDRFLAGS 1054 AUXARGS_ENTRY(pos, AT_EHDRFLAGS, args->hdr_eflags); 1055 #endif 1056 if (imgp->execpathp != 0) 1057 AUXARGS_ENTRY(pos, AT_EXECPATH, imgp->execpathp); 1058 AUXARGS_ENTRY(pos, AT_OSRELDATE, 1059 imgp->proc->p_ucred->cr_prison->pr_osreldate); 1060 if (imgp->canary != 0) { 1061 AUXARGS_ENTRY(pos, AT_CANARY, imgp->canary); 1062 AUXARGS_ENTRY(pos, AT_CANARYLEN, imgp->canarylen); 1063 } 1064 AUXARGS_ENTRY(pos, AT_NCPUS, mp_ncpus); 1065 if (imgp->pagesizes != 0) { 1066 AUXARGS_ENTRY(pos, AT_PAGESIZES, imgp->pagesizes); 1067 AUXARGS_ENTRY(pos, AT_PAGESIZESLEN, imgp->pagesizeslen); 1068 } 1069 if (imgp->sysent->sv_timekeep_base != 0) { 1070 AUXARGS_ENTRY(pos, AT_TIMEKEEP, 1071 imgp->sysent->sv_timekeep_base); 1072 } 1073 AUXARGS_ENTRY(pos, AT_STACKPROT, imgp->sysent->sv_shared_page_obj 1074 != NULL && imgp->stack_prot != 0 ? imgp->stack_prot : 1075 imgp->sysent->sv_stackprot); 1076 AUXARGS_ENTRY(pos, AT_NULL, 0); 1077 1078 free(imgp->auxargs, M_TEMP); 1079 imgp->auxargs = NULL; 1080 1081 base--; 1082 suword(base, (long)imgp->args->argc); 1083 *stack_base = (register_t *)base; 1084 return (0); 1085 } 1086 1087 /* 1088 * Code for generating ELF core dumps. 1089 */ 1090 1091 typedef void (*segment_callback)(vm_map_entry_t, void *); 1092 1093 /* Closure for cb_put_phdr(). */ 1094 struct phdr_closure { 1095 Elf_Phdr *phdr; /* Program header to fill in */ 1096 Elf_Off offset; /* Offset of segment in core file */ 1097 }; 1098 1099 /* Closure for cb_size_segment(). */ 1100 struct sseg_closure { 1101 int count; /* Count of writable segments. */ 1102 size_t size; /* Total size of all writable segments. */ 1103 }; 1104 1105 typedef void (*outfunc_t)(void *, struct sbuf *, size_t *); 1106 1107 struct note_info { 1108 int type; /* Note type. */ 1109 outfunc_t outfunc; /* Output function. */ 1110 void *outarg; /* Argument for the output function. */ 1111 size_t outsize; /* Output size. */ 1112 TAILQ_ENTRY(note_info) link; /* Link to the next note info. */ 1113 }; 1114 1115 TAILQ_HEAD(note_info_list, note_info); 1116 1117 /* Coredump output parameters. */ 1118 struct coredump_params { 1119 off_t offset; 1120 struct ucred *active_cred; 1121 struct ucred *file_cred; 1122 struct thread *td; 1123 struct vnode *vp; 1124 struct gzio_stream *gzs; 1125 }; 1126 1127 static void cb_put_phdr(vm_map_entry_t, void *); 1128 static void cb_size_segment(vm_map_entry_t, void *); 1129 static int core_write(struct coredump_params *, void *, size_t, off_t, 1130 enum uio_seg); 1131 static void each_writable_segment(struct thread *, segment_callback, void *); 1132 static int __elfN(corehdr)(struct coredump_params *, int, void *, size_t, 1133 struct note_info_list *, size_t); 1134 static void __elfN(prepare_notes)(struct thread *, struct note_info_list *, 1135 size_t *); 1136 static void __elfN(puthdr)(struct thread *, void *, size_t, int, size_t); 1137 static void __elfN(putnote)(struct note_info *, struct sbuf *); 1138 static size_t register_note(struct note_info_list *, int, outfunc_t, void *); 1139 static int sbuf_drain_core_output(void *, const char *, int); 1140 static int sbuf_drain_count(void *arg, const char *data, int len); 1141 1142 static void __elfN(note_fpregset)(void *, struct sbuf *, size_t *); 1143 static void __elfN(note_prpsinfo)(void *, struct sbuf *, size_t *); 1144 static void __elfN(note_prstatus)(void *, struct sbuf *, size_t *); 1145 static void __elfN(note_threadmd)(void *, struct sbuf *, size_t *); 1146 static void __elfN(note_thrmisc)(void *, struct sbuf *, size_t *); 1147 static void __elfN(note_procstat_auxv)(void *, struct sbuf *, size_t *); 1148 static void __elfN(note_procstat_proc)(void *, struct sbuf *, size_t *); 1149 static void __elfN(note_procstat_psstrings)(void *, struct sbuf *, size_t *); 1150 static void note_procstat_files(void *, struct sbuf *, size_t *); 1151 static void note_procstat_groups(void *, struct sbuf *, size_t *); 1152 static void note_procstat_osrel(void *, struct sbuf *, size_t *); 1153 static void note_procstat_rlimit(void *, struct sbuf *, size_t *); 1154 static void note_procstat_umask(void *, struct sbuf *, size_t *); 1155 static void note_procstat_vmmap(void *, struct sbuf *, size_t *); 1156 1157 #ifdef GZIO 1158 extern int compress_user_cores_gzlevel; 1159 1160 /* 1161 * Write out a core segment to the compression stream. 1162 */ 1163 static int 1164 compress_chunk(struct coredump_params *p, char *base, char *buf, u_int len) 1165 { 1166 u_int chunk_len; 1167 int error; 1168 1169 while (len > 0) { 1170 chunk_len = MIN(len, CORE_BUF_SIZE); 1171 copyin(base, buf, chunk_len); 1172 error = gzio_write(p->gzs, buf, chunk_len); 1173 if (error != 0) 1174 break; 1175 base += chunk_len; 1176 len -= chunk_len; 1177 } 1178 return (error); 1179 } 1180 1181 static int 1182 core_gz_write(void *base, size_t len, off_t offset, void *arg) 1183 { 1184 1185 return (core_write((struct coredump_params *)arg, base, len, offset, 1186 UIO_SYSSPACE)); 1187 } 1188 #endif /* GZIO */ 1189 1190 static int 1191 core_write(struct coredump_params *p, void *base, size_t len, off_t offset, 1192 enum uio_seg seg) 1193 { 1194 1195 return (vn_rdwr_inchunks(UIO_WRITE, p->vp, base, len, offset, 1196 seg, IO_UNIT | IO_DIRECT | IO_RANGELOCKED, 1197 p->active_cred, p->file_cred, NULL, p->td)); 1198 } 1199 1200 static int 1201 core_output(void *base, size_t len, off_t offset, struct coredump_params *p, 1202 void *tmpbuf) 1203 { 1204 1205 #ifdef GZIO 1206 if (p->gzs != NULL) 1207 return (compress_chunk(p, base, tmpbuf, len)); 1208 #endif 1209 return (core_write(p, base, len, offset, UIO_USERSPACE)); 1210 } 1211 1212 /* 1213 * Drain into a core file. 1214 */ 1215 static int 1216 sbuf_drain_core_output(void *arg, const char *data, int len) 1217 { 1218 struct coredump_params *p; 1219 int error, locked; 1220 1221 p = (struct coredump_params *)arg; 1222 1223 /* 1224 * Some kern_proc out routines that print to this sbuf may 1225 * call us with the process lock held. Draining with the 1226 * non-sleepable lock held is unsafe. The lock is needed for 1227 * those routines when dumping a live process. In our case we 1228 * can safely release the lock before draining and acquire 1229 * again after. 1230 */ 1231 locked = PROC_LOCKED(p->td->td_proc); 1232 if (locked) 1233 PROC_UNLOCK(p->td->td_proc); 1234 #ifdef GZIO 1235 if (p->gzs != NULL) 1236 error = gzio_write(p->gzs, __DECONST(char *, data), len); 1237 else 1238 #endif 1239 error = core_write(p, __DECONST(void *, data), len, p->offset, 1240 UIO_SYSSPACE); 1241 if (locked) 1242 PROC_LOCK(p->td->td_proc); 1243 if (error != 0) 1244 return (-error); 1245 p->offset += len; 1246 return (len); 1247 } 1248 1249 /* 1250 * Drain into a counter. 1251 */ 1252 static int 1253 sbuf_drain_count(void *arg, const char *data __unused, int len) 1254 { 1255 size_t *sizep; 1256 1257 sizep = (size_t *)arg; 1258 *sizep += len; 1259 return (len); 1260 } 1261 1262 int 1263 __elfN(coredump)(struct thread *td, struct vnode *vp, off_t limit, int flags) 1264 { 1265 struct ucred *cred = td->td_ucred; 1266 int error = 0; 1267 struct sseg_closure seginfo; 1268 struct note_info_list notelst; 1269 struct coredump_params params; 1270 struct note_info *ninfo; 1271 void *hdr, *tmpbuf; 1272 size_t hdrsize, notesz, coresize; 1273 boolean_t compress; 1274 1275 compress = (flags & IMGACT_CORE_COMPRESS) != 0; 1276 hdr = NULL; 1277 tmpbuf = NULL; 1278 TAILQ_INIT(¬elst); 1279 1280 /* Size the program segments. */ 1281 seginfo.count = 0; 1282 seginfo.size = 0; 1283 each_writable_segment(td, cb_size_segment, &seginfo); 1284 1285 /* 1286 * Collect info about the core file header area. 1287 */ 1288 hdrsize = sizeof(Elf_Ehdr) + sizeof(Elf_Phdr) * (1 + seginfo.count); 1289 __elfN(prepare_notes)(td, ¬elst, ¬esz); 1290 coresize = round_page(hdrsize + notesz) + seginfo.size; 1291 1292 /* Set up core dump parameters. */ 1293 params.offset = 0; 1294 params.active_cred = cred; 1295 params.file_cred = NOCRED; 1296 params.td = td; 1297 params.vp = vp; 1298 params.gzs = NULL; 1299 1300 #ifdef RACCT 1301 if (racct_enable) { 1302 PROC_LOCK(td->td_proc); 1303 error = racct_add(td->td_proc, RACCT_CORE, coresize); 1304 PROC_UNLOCK(td->td_proc); 1305 if (error != 0) { 1306 error = EFAULT; 1307 goto done; 1308 } 1309 } 1310 #endif 1311 if (coresize >= limit) { 1312 error = EFAULT; 1313 goto done; 1314 } 1315 1316 #ifdef GZIO 1317 /* Create a compression stream if necessary. */ 1318 if (compress) { 1319 params.gzs = gzio_init(core_gz_write, GZIO_DEFLATE, 1320 CORE_BUF_SIZE, compress_user_cores_gzlevel, ¶ms); 1321 if (params.gzs == NULL) { 1322 error = EFAULT; 1323 goto done; 1324 } 1325 tmpbuf = malloc(CORE_BUF_SIZE, M_TEMP, M_WAITOK | M_ZERO); 1326 } 1327 #endif 1328 1329 /* 1330 * Allocate memory for building the header, fill it up, 1331 * and write it out following the notes. 1332 */ 1333 hdr = malloc(hdrsize, M_TEMP, M_WAITOK); 1334 if (hdr == NULL) { 1335 error = EINVAL; 1336 goto done; 1337 } 1338 error = __elfN(corehdr)(¶ms, seginfo.count, hdr, hdrsize, ¬elst, 1339 notesz); 1340 1341 /* Write the contents of all of the writable segments. */ 1342 if (error == 0) { 1343 Elf_Phdr *php; 1344 off_t offset; 1345 int i; 1346 1347 php = (Elf_Phdr *)((char *)hdr + sizeof(Elf_Ehdr)) + 1; 1348 offset = round_page(hdrsize + notesz); 1349 for (i = 0; i < seginfo.count; i++) { 1350 error = core_output((caddr_t)(uintptr_t)php->p_vaddr, 1351 php->p_filesz, offset, ¶ms, tmpbuf); 1352 if (error != 0) 1353 break; 1354 offset += php->p_filesz; 1355 php++; 1356 } 1357 #ifdef GZIO 1358 if (error == 0 && compress) 1359 error = gzio_flush(params.gzs); 1360 #endif 1361 } 1362 if (error) { 1363 log(LOG_WARNING, 1364 "Failed to write core file for process %s (error %d)\n", 1365 curproc->p_comm, error); 1366 } 1367 1368 done: 1369 #ifdef GZIO 1370 if (compress) { 1371 free(tmpbuf, M_TEMP); 1372 if (params.gzs != NULL) 1373 gzio_fini(params.gzs); 1374 } 1375 #endif 1376 while ((ninfo = TAILQ_FIRST(¬elst)) != NULL) { 1377 TAILQ_REMOVE(¬elst, ninfo, link); 1378 free(ninfo, M_TEMP); 1379 } 1380 if (hdr != NULL) 1381 free(hdr, M_TEMP); 1382 1383 return (error); 1384 } 1385 1386 /* 1387 * A callback for each_writable_segment() to write out the segment's 1388 * program header entry. 1389 */ 1390 static void 1391 cb_put_phdr(entry, closure) 1392 vm_map_entry_t entry; 1393 void *closure; 1394 { 1395 struct phdr_closure *phc = (struct phdr_closure *)closure; 1396 Elf_Phdr *phdr = phc->phdr; 1397 1398 phc->offset = round_page(phc->offset); 1399 1400 phdr->p_type = PT_LOAD; 1401 phdr->p_offset = phc->offset; 1402 phdr->p_vaddr = entry->start; 1403 phdr->p_paddr = 0; 1404 phdr->p_filesz = phdr->p_memsz = entry->end - entry->start; 1405 phdr->p_align = PAGE_SIZE; 1406 phdr->p_flags = __elfN(untrans_prot)(entry->protection); 1407 1408 phc->offset += phdr->p_filesz; 1409 phc->phdr++; 1410 } 1411 1412 /* 1413 * A callback for each_writable_segment() to gather information about 1414 * the number of segments and their total size. 1415 */ 1416 static void 1417 cb_size_segment(entry, closure) 1418 vm_map_entry_t entry; 1419 void *closure; 1420 { 1421 struct sseg_closure *ssc = (struct sseg_closure *)closure; 1422 1423 ssc->count++; 1424 ssc->size += entry->end - entry->start; 1425 } 1426 1427 /* 1428 * For each writable segment in the process's memory map, call the given 1429 * function with a pointer to the map entry and some arbitrary 1430 * caller-supplied data. 1431 */ 1432 static void 1433 each_writable_segment(td, func, closure) 1434 struct thread *td; 1435 segment_callback func; 1436 void *closure; 1437 { 1438 struct proc *p = td->td_proc; 1439 vm_map_t map = &p->p_vmspace->vm_map; 1440 vm_map_entry_t entry; 1441 vm_object_t backing_object, object; 1442 boolean_t ignore_entry; 1443 1444 vm_map_lock_read(map); 1445 for (entry = map->header.next; entry != &map->header; 1446 entry = entry->next) { 1447 /* 1448 * Don't dump inaccessible mappings, deal with legacy 1449 * coredump mode. 1450 * 1451 * Note that read-only segments related to the elf binary 1452 * are marked MAP_ENTRY_NOCOREDUMP now so we no longer 1453 * need to arbitrarily ignore such segments. 1454 */ 1455 if (elf_legacy_coredump) { 1456 if ((entry->protection & VM_PROT_RW) != VM_PROT_RW) 1457 continue; 1458 } else { 1459 if ((entry->protection & VM_PROT_ALL) == 0) 1460 continue; 1461 } 1462 1463 /* 1464 * Dont include memory segment in the coredump if 1465 * MAP_NOCORE is set in mmap(2) or MADV_NOCORE in 1466 * madvise(2). Do not dump submaps (i.e. parts of the 1467 * kernel map). 1468 */ 1469 if (entry->eflags & (MAP_ENTRY_NOCOREDUMP|MAP_ENTRY_IS_SUB_MAP)) 1470 continue; 1471 1472 if ((object = entry->object.vm_object) == NULL) 1473 continue; 1474 1475 /* Ignore memory-mapped devices and such things. */ 1476 VM_OBJECT_RLOCK(object); 1477 while ((backing_object = object->backing_object) != NULL) { 1478 VM_OBJECT_RLOCK(backing_object); 1479 VM_OBJECT_RUNLOCK(object); 1480 object = backing_object; 1481 } 1482 ignore_entry = object->type != OBJT_DEFAULT && 1483 object->type != OBJT_SWAP && object->type != OBJT_VNODE && 1484 object->type != OBJT_PHYS; 1485 VM_OBJECT_RUNLOCK(object); 1486 if (ignore_entry) 1487 continue; 1488 1489 (*func)(entry, closure); 1490 } 1491 vm_map_unlock_read(map); 1492 } 1493 1494 /* 1495 * Write the core file header to the file, including padding up to 1496 * the page boundary. 1497 */ 1498 static int 1499 __elfN(corehdr)(struct coredump_params *p, int numsegs, void *hdr, 1500 size_t hdrsize, struct note_info_list *notelst, size_t notesz) 1501 { 1502 struct note_info *ninfo; 1503 struct sbuf *sb; 1504 int error; 1505 1506 /* Fill in the header. */ 1507 bzero(hdr, hdrsize); 1508 __elfN(puthdr)(p->td, hdr, hdrsize, numsegs, notesz); 1509 1510 sb = sbuf_new(NULL, NULL, CORE_BUF_SIZE, SBUF_FIXEDLEN); 1511 sbuf_set_drain(sb, sbuf_drain_core_output, p); 1512 sbuf_start_section(sb, NULL); 1513 sbuf_bcat(sb, hdr, hdrsize); 1514 TAILQ_FOREACH(ninfo, notelst, link) 1515 __elfN(putnote)(ninfo, sb); 1516 /* Align up to a page boundary for the program segments. */ 1517 sbuf_end_section(sb, -1, PAGE_SIZE, 0); 1518 error = sbuf_finish(sb); 1519 sbuf_delete(sb); 1520 1521 return (error); 1522 } 1523 1524 static void 1525 __elfN(prepare_notes)(struct thread *td, struct note_info_list *list, 1526 size_t *sizep) 1527 { 1528 struct proc *p; 1529 struct thread *thr; 1530 size_t size; 1531 1532 p = td->td_proc; 1533 size = 0; 1534 1535 size += register_note(list, NT_PRPSINFO, __elfN(note_prpsinfo), p); 1536 1537 /* 1538 * To have the debugger select the right thread (LWP) as the initial 1539 * thread, we dump the state of the thread passed to us in td first. 1540 * This is the thread that causes the core dump and thus likely to 1541 * be the right thread one wants to have selected in the debugger. 1542 */ 1543 thr = td; 1544 while (thr != NULL) { 1545 size += register_note(list, NT_PRSTATUS, 1546 __elfN(note_prstatus), thr); 1547 size += register_note(list, NT_FPREGSET, 1548 __elfN(note_fpregset), thr); 1549 size += register_note(list, NT_THRMISC, 1550 __elfN(note_thrmisc), thr); 1551 size += register_note(list, -1, 1552 __elfN(note_threadmd), thr); 1553 1554 thr = (thr == td) ? TAILQ_FIRST(&p->p_threads) : 1555 TAILQ_NEXT(thr, td_plist); 1556 if (thr == td) 1557 thr = TAILQ_NEXT(thr, td_plist); 1558 } 1559 1560 size += register_note(list, NT_PROCSTAT_PROC, 1561 __elfN(note_procstat_proc), p); 1562 size += register_note(list, NT_PROCSTAT_FILES, 1563 note_procstat_files, p); 1564 size += register_note(list, NT_PROCSTAT_VMMAP, 1565 note_procstat_vmmap, p); 1566 size += register_note(list, NT_PROCSTAT_GROUPS, 1567 note_procstat_groups, p); 1568 size += register_note(list, NT_PROCSTAT_UMASK, 1569 note_procstat_umask, p); 1570 size += register_note(list, NT_PROCSTAT_RLIMIT, 1571 note_procstat_rlimit, p); 1572 size += register_note(list, NT_PROCSTAT_OSREL, 1573 note_procstat_osrel, p); 1574 size += register_note(list, NT_PROCSTAT_PSSTRINGS, 1575 __elfN(note_procstat_psstrings), p); 1576 size += register_note(list, NT_PROCSTAT_AUXV, 1577 __elfN(note_procstat_auxv), p); 1578 1579 *sizep = size; 1580 } 1581 1582 static void 1583 __elfN(puthdr)(struct thread *td, void *hdr, size_t hdrsize, int numsegs, 1584 size_t notesz) 1585 { 1586 Elf_Ehdr *ehdr; 1587 Elf_Phdr *phdr; 1588 struct phdr_closure phc; 1589 1590 ehdr = (Elf_Ehdr *)hdr; 1591 phdr = (Elf_Phdr *)((char *)hdr + sizeof(Elf_Ehdr)); 1592 1593 ehdr->e_ident[EI_MAG0] = ELFMAG0; 1594 ehdr->e_ident[EI_MAG1] = ELFMAG1; 1595 ehdr->e_ident[EI_MAG2] = ELFMAG2; 1596 ehdr->e_ident[EI_MAG3] = ELFMAG3; 1597 ehdr->e_ident[EI_CLASS] = ELF_CLASS; 1598 ehdr->e_ident[EI_DATA] = ELF_DATA; 1599 ehdr->e_ident[EI_VERSION] = EV_CURRENT; 1600 ehdr->e_ident[EI_OSABI] = ELFOSABI_FREEBSD; 1601 ehdr->e_ident[EI_ABIVERSION] = 0; 1602 ehdr->e_ident[EI_PAD] = 0; 1603 ehdr->e_type = ET_CORE; 1604 #if defined(COMPAT_FREEBSD32) && __ELF_WORD_SIZE == 32 1605 ehdr->e_machine = ELF_ARCH32; 1606 #else 1607 ehdr->e_machine = ELF_ARCH; 1608 #endif 1609 ehdr->e_version = EV_CURRENT; 1610 ehdr->e_entry = 0; 1611 ehdr->e_phoff = sizeof(Elf_Ehdr); 1612 ehdr->e_flags = 0; 1613 ehdr->e_ehsize = sizeof(Elf_Ehdr); 1614 ehdr->e_phentsize = sizeof(Elf_Phdr); 1615 ehdr->e_phnum = numsegs + 1; 1616 ehdr->e_shentsize = sizeof(Elf_Shdr); 1617 ehdr->e_shnum = 0; 1618 ehdr->e_shstrndx = SHN_UNDEF; 1619 1620 /* 1621 * Fill in the program header entries. 1622 */ 1623 1624 /* The note segement. */ 1625 phdr->p_type = PT_NOTE; 1626 phdr->p_offset = hdrsize; 1627 phdr->p_vaddr = 0; 1628 phdr->p_paddr = 0; 1629 phdr->p_filesz = notesz; 1630 phdr->p_memsz = 0; 1631 phdr->p_flags = PF_R; 1632 phdr->p_align = ELF_NOTE_ROUNDSIZE; 1633 phdr++; 1634 1635 /* All the writable segments from the program. */ 1636 phc.phdr = phdr; 1637 phc.offset = round_page(hdrsize + notesz); 1638 each_writable_segment(td, cb_put_phdr, &phc); 1639 } 1640 1641 static size_t 1642 register_note(struct note_info_list *list, int type, outfunc_t out, void *arg) 1643 { 1644 struct note_info *ninfo; 1645 size_t size, notesize; 1646 1647 size = 0; 1648 out(arg, NULL, &size); 1649 ninfo = malloc(sizeof(*ninfo), M_TEMP, M_ZERO | M_WAITOK); 1650 ninfo->type = type; 1651 ninfo->outfunc = out; 1652 ninfo->outarg = arg; 1653 ninfo->outsize = size; 1654 TAILQ_INSERT_TAIL(list, ninfo, link); 1655 1656 if (type == -1) 1657 return (size); 1658 1659 notesize = sizeof(Elf_Note) + /* note header */ 1660 roundup2(sizeof(FREEBSD_ABI_VENDOR), ELF_NOTE_ROUNDSIZE) + 1661 /* note name */ 1662 roundup2(size, ELF_NOTE_ROUNDSIZE); /* note description */ 1663 1664 return (notesize); 1665 } 1666 1667 static size_t 1668 append_note_data(const void *src, void *dst, size_t len) 1669 { 1670 size_t padded_len; 1671 1672 padded_len = roundup2(len, ELF_NOTE_ROUNDSIZE); 1673 if (dst != NULL) { 1674 bcopy(src, dst, len); 1675 bzero((char *)dst + len, padded_len - len); 1676 } 1677 return (padded_len); 1678 } 1679 1680 size_t 1681 __elfN(populate_note)(int type, void *src, void *dst, size_t size, void **descp) 1682 { 1683 Elf_Note *note; 1684 char *buf; 1685 size_t notesize; 1686 1687 buf = dst; 1688 if (buf != NULL) { 1689 note = (Elf_Note *)buf; 1690 note->n_namesz = sizeof(FREEBSD_ABI_VENDOR); 1691 note->n_descsz = size; 1692 note->n_type = type; 1693 buf += sizeof(*note); 1694 buf += append_note_data(FREEBSD_ABI_VENDOR, buf, 1695 sizeof(FREEBSD_ABI_VENDOR)); 1696 append_note_data(src, buf, size); 1697 if (descp != NULL) 1698 *descp = buf; 1699 } 1700 1701 notesize = sizeof(Elf_Note) + /* note header */ 1702 roundup2(sizeof(FREEBSD_ABI_VENDOR), ELF_NOTE_ROUNDSIZE) + 1703 /* note name */ 1704 roundup2(size, ELF_NOTE_ROUNDSIZE); /* note description */ 1705 1706 return (notesize); 1707 } 1708 1709 static void 1710 __elfN(putnote)(struct note_info *ninfo, struct sbuf *sb) 1711 { 1712 Elf_Note note; 1713 ssize_t old_len, sect_len; 1714 size_t new_len, descsz, i; 1715 1716 if (ninfo->type == -1) { 1717 ninfo->outfunc(ninfo->outarg, sb, &ninfo->outsize); 1718 return; 1719 } 1720 1721 note.n_namesz = sizeof(FREEBSD_ABI_VENDOR); 1722 note.n_descsz = ninfo->outsize; 1723 note.n_type = ninfo->type; 1724 1725 sbuf_bcat(sb, ¬e, sizeof(note)); 1726 sbuf_start_section(sb, &old_len); 1727 sbuf_bcat(sb, FREEBSD_ABI_VENDOR, sizeof(FREEBSD_ABI_VENDOR)); 1728 sbuf_end_section(sb, old_len, ELF_NOTE_ROUNDSIZE, 0); 1729 if (note.n_descsz == 0) 1730 return; 1731 sbuf_start_section(sb, &old_len); 1732 ninfo->outfunc(ninfo->outarg, sb, &ninfo->outsize); 1733 sect_len = sbuf_end_section(sb, old_len, ELF_NOTE_ROUNDSIZE, 0); 1734 if (sect_len < 0) 1735 return; 1736 1737 new_len = (size_t)sect_len; 1738 descsz = roundup(note.n_descsz, ELF_NOTE_ROUNDSIZE); 1739 if (new_len < descsz) { 1740 /* 1741 * It is expected that individual note emitters will correctly 1742 * predict their expected output size and fill up to that size 1743 * themselves, padding in a format-specific way if needed. 1744 * However, in case they don't, just do it here with zeros. 1745 */ 1746 for (i = 0; i < descsz - new_len; i++) 1747 sbuf_putc(sb, 0); 1748 } else if (new_len > descsz) { 1749 /* 1750 * We can't always truncate sb -- we may have drained some 1751 * of it already. 1752 */ 1753 KASSERT(new_len == descsz, ("%s: Note type %u changed as we " 1754 "read it (%zu > %zu). Since it is longer than " 1755 "expected, this coredump's notes are corrupt. THIS " 1756 "IS A BUG in the note_procstat routine for type %u.\n", 1757 __func__, (unsigned)note.n_type, new_len, descsz, 1758 (unsigned)note.n_type)); 1759 } 1760 } 1761 1762 /* 1763 * Miscellaneous note out functions. 1764 */ 1765 1766 #if defined(COMPAT_FREEBSD32) && __ELF_WORD_SIZE == 32 1767 #include <compat/freebsd32/freebsd32.h> 1768 1769 typedef struct prstatus32 elf_prstatus_t; 1770 typedef struct prpsinfo32 elf_prpsinfo_t; 1771 typedef struct fpreg32 elf_prfpregset_t; 1772 typedef struct fpreg32 elf_fpregset_t; 1773 typedef struct reg32 elf_gregset_t; 1774 typedef struct thrmisc32 elf_thrmisc_t; 1775 #define ELF_KERN_PROC_MASK KERN_PROC_MASK32 1776 typedef struct kinfo_proc32 elf_kinfo_proc_t; 1777 typedef uint32_t elf_ps_strings_t; 1778 #else 1779 typedef prstatus_t elf_prstatus_t; 1780 typedef prpsinfo_t elf_prpsinfo_t; 1781 typedef prfpregset_t elf_prfpregset_t; 1782 typedef prfpregset_t elf_fpregset_t; 1783 typedef gregset_t elf_gregset_t; 1784 typedef thrmisc_t elf_thrmisc_t; 1785 #define ELF_KERN_PROC_MASK 0 1786 typedef struct kinfo_proc elf_kinfo_proc_t; 1787 typedef vm_offset_t elf_ps_strings_t; 1788 #endif 1789 1790 static void 1791 __elfN(note_prpsinfo)(void *arg, struct sbuf *sb, size_t *sizep) 1792 { 1793 struct proc *p; 1794 elf_prpsinfo_t *psinfo; 1795 1796 p = (struct proc *)arg; 1797 if (sb != NULL) { 1798 KASSERT(*sizep == sizeof(*psinfo), ("invalid size")); 1799 psinfo = malloc(sizeof(*psinfo), M_TEMP, M_ZERO | M_WAITOK); 1800 psinfo->pr_version = PRPSINFO_VERSION; 1801 psinfo->pr_psinfosz = sizeof(elf_prpsinfo_t); 1802 strlcpy(psinfo->pr_fname, p->p_comm, sizeof(psinfo->pr_fname)); 1803 /* 1804 * XXX - We don't fill in the command line arguments properly 1805 * yet. 1806 */ 1807 strlcpy(psinfo->pr_psargs, p->p_comm, 1808 sizeof(psinfo->pr_psargs)); 1809 1810 sbuf_bcat(sb, psinfo, sizeof(*psinfo)); 1811 free(psinfo, M_TEMP); 1812 } 1813 *sizep = sizeof(*psinfo); 1814 } 1815 1816 static void 1817 __elfN(note_prstatus)(void *arg, struct sbuf *sb, size_t *sizep) 1818 { 1819 struct thread *td; 1820 elf_prstatus_t *status; 1821 1822 td = (struct thread *)arg; 1823 if (sb != NULL) { 1824 KASSERT(*sizep == sizeof(*status), ("invalid size")); 1825 status = malloc(sizeof(*status), M_TEMP, M_ZERO | M_WAITOK); 1826 status->pr_version = PRSTATUS_VERSION; 1827 status->pr_statussz = sizeof(elf_prstatus_t); 1828 status->pr_gregsetsz = sizeof(elf_gregset_t); 1829 status->pr_fpregsetsz = sizeof(elf_fpregset_t); 1830 status->pr_osreldate = osreldate; 1831 status->pr_cursig = td->td_proc->p_sig; 1832 status->pr_pid = td->td_tid; 1833 #if defined(COMPAT_FREEBSD32) && __ELF_WORD_SIZE == 32 1834 fill_regs32(td, &status->pr_reg); 1835 #else 1836 fill_regs(td, &status->pr_reg); 1837 #endif 1838 sbuf_bcat(sb, status, sizeof(*status)); 1839 free(status, M_TEMP); 1840 } 1841 *sizep = sizeof(*status); 1842 } 1843 1844 static void 1845 __elfN(note_fpregset)(void *arg, struct sbuf *sb, size_t *sizep) 1846 { 1847 struct thread *td; 1848 elf_prfpregset_t *fpregset; 1849 1850 td = (struct thread *)arg; 1851 if (sb != NULL) { 1852 KASSERT(*sizep == sizeof(*fpregset), ("invalid size")); 1853 fpregset = malloc(sizeof(*fpregset), M_TEMP, M_ZERO | M_WAITOK); 1854 #if defined(COMPAT_FREEBSD32) && __ELF_WORD_SIZE == 32 1855 fill_fpregs32(td, fpregset); 1856 #else 1857 fill_fpregs(td, fpregset); 1858 #endif 1859 sbuf_bcat(sb, fpregset, sizeof(*fpregset)); 1860 free(fpregset, M_TEMP); 1861 } 1862 *sizep = sizeof(*fpregset); 1863 } 1864 1865 static void 1866 __elfN(note_thrmisc)(void *arg, struct sbuf *sb, size_t *sizep) 1867 { 1868 struct thread *td; 1869 elf_thrmisc_t thrmisc; 1870 1871 td = (struct thread *)arg; 1872 if (sb != NULL) { 1873 KASSERT(*sizep == sizeof(thrmisc), ("invalid size")); 1874 bzero(&thrmisc._pad, sizeof(thrmisc._pad)); 1875 strcpy(thrmisc.pr_tname, td->td_name); 1876 sbuf_bcat(sb, &thrmisc, sizeof(thrmisc)); 1877 } 1878 *sizep = sizeof(thrmisc); 1879 } 1880 1881 /* 1882 * Allow for MD specific notes, as well as any MD 1883 * specific preparations for writing MI notes. 1884 */ 1885 static void 1886 __elfN(note_threadmd)(void *arg, struct sbuf *sb, size_t *sizep) 1887 { 1888 struct thread *td; 1889 void *buf; 1890 size_t size; 1891 1892 td = (struct thread *)arg; 1893 size = *sizep; 1894 if (size != 0 && sb != NULL) 1895 buf = malloc(size, M_TEMP, M_ZERO | M_WAITOK); 1896 else 1897 buf = NULL; 1898 size = 0; 1899 __elfN(dump_thread)(td, buf, &size); 1900 KASSERT(sb == NULL || *sizep == size, ("invalid size")); 1901 if (size != 0 && sb != NULL) 1902 sbuf_bcat(sb, buf, size); 1903 free(buf, M_TEMP); 1904 *sizep = size; 1905 } 1906 1907 #ifdef KINFO_PROC_SIZE 1908 CTASSERT(sizeof(struct kinfo_proc) == KINFO_PROC_SIZE); 1909 #endif 1910 1911 static void 1912 __elfN(note_procstat_proc)(void *arg, struct sbuf *sb, size_t *sizep) 1913 { 1914 struct proc *p; 1915 size_t size; 1916 int structsize; 1917 1918 p = (struct proc *)arg; 1919 size = sizeof(structsize) + p->p_numthreads * 1920 sizeof(elf_kinfo_proc_t); 1921 1922 if (sb != NULL) { 1923 KASSERT(*sizep == size, ("invalid size")); 1924 structsize = sizeof(elf_kinfo_proc_t); 1925 sbuf_bcat(sb, &structsize, sizeof(structsize)); 1926 sx_slock(&proctree_lock); 1927 PROC_LOCK(p); 1928 kern_proc_out(p, sb, ELF_KERN_PROC_MASK); 1929 sx_sunlock(&proctree_lock); 1930 } 1931 *sizep = size; 1932 } 1933 1934 #ifdef KINFO_FILE_SIZE 1935 CTASSERT(sizeof(struct kinfo_file) == KINFO_FILE_SIZE); 1936 #endif 1937 1938 static void 1939 note_procstat_files(void *arg, struct sbuf *sb, size_t *sizep) 1940 { 1941 struct proc *p; 1942 size_t size, sect_sz, i; 1943 ssize_t start_len, sect_len; 1944 int structsize, filedesc_flags; 1945 1946 if (coredump_pack_fileinfo) 1947 filedesc_flags = KERN_FILEDESC_PACK_KINFO; 1948 else 1949 filedesc_flags = 0; 1950 1951 p = (struct proc *)arg; 1952 structsize = sizeof(struct kinfo_file); 1953 if (sb == NULL) { 1954 size = 0; 1955 sb = sbuf_new(NULL, NULL, 128, SBUF_FIXEDLEN); 1956 sbuf_set_drain(sb, sbuf_drain_count, &size); 1957 sbuf_bcat(sb, &structsize, sizeof(structsize)); 1958 PROC_LOCK(p); 1959 kern_proc_filedesc_out(p, sb, -1, filedesc_flags); 1960 sbuf_finish(sb); 1961 sbuf_delete(sb); 1962 *sizep = size; 1963 } else { 1964 sbuf_start_section(sb, &start_len); 1965 1966 sbuf_bcat(sb, &structsize, sizeof(structsize)); 1967 PROC_LOCK(p); 1968 kern_proc_filedesc_out(p, sb, *sizep - sizeof(structsize), 1969 filedesc_flags); 1970 1971 sect_len = sbuf_end_section(sb, start_len, 0, 0); 1972 if (sect_len < 0) 1973 return; 1974 sect_sz = sect_len; 1975 1976 KASSERT(sect_sz <= *sizep, 1977 ("kern_proc_filedesc_out did not respect maxlen; " 1978 "requested %zu, got %zu", *sizep - sizeof(structsize), 1979 sect_sz - sizeof(structsize))); 1980 1981 for (i = 0; i < *sizep - sect_sz && sb->s_error == 0; i++) 1982 sbuf_putc(sb, 0); 1983 } 1984 } 1985 1986 #ifdef KINFO_VMENTRY_SIZE 1987 CTASSERT(sizeof(struct kinfo_vmentry) == KINFO_VMENTRY_SIZE); 1988 #endif 1989 1990 static void 1991 note_procstat_vmmap(void *arg, struct sbuf *sb, size_t *sizep) 1992 { 1993 struct proc *p; 1994 size_t size; 1995 int structsize, vmmap_flags; 1996 1997 if (coredump_pack_vmmapinfo) 1998 vmmap_flags = KERN_VMMAP_PACK_KINFO; 1999 else 2000 vmmap_flags = 0; 2001 2002 p = (struct proc *)arg; 2003 structsize = sizeof(struct kinfo_vmentry); 2004 if (sb == NULL) { 2005 size = 0; 2006 sb = sbuf_new(NULL, NULL, 128, SBUF_FIXEDLEN); 2007 sbuf_set_drain(sb, sbuf_drain_count, &size); 2008 sbuf_bcat(sb, &structsize, sizeof(structsize)); 2009 PROC_LOCK(p); 2010 kern_proc_vmmap_out(p, sb, -1, vmmap_flags); 2011 sbuf_finish(sb); 2012 sbuf_delete(sb); 2013 *sizep = size; 2014 } else { 2015 sbuf_bcat(sb, &structsize, sizeof(structsize)); 2016 PROC_LOCK(p); 2017 kern_proc_vmmap_out(p, sb, *sizep - sizeof(structsize), 2018 vmmap_flags); 2019 } 2020 } 2021 2022 static void 2023 note_procstat_groups(void *arg, struct sbuf *sb, size_t *sizep) 2024 { 2025 struct proc *p; 2026 size_t size; 2027 int structsize; 2028 2029 p = (struct proc *)arg; 2030 size = sizeof(structsize) + p->p_ucred->cr_ngroups * sizeof(gid_t); 2031 if (sb != NULL) { 2032 KASSERT(*sizep == size, ("invalid size")); 2033 structsize = sizeof(gid_t); 2034 sbuf_bcat(sb, &structsize, sizeof(structsize)); 2035 sbuf_bcat(sb, p->p_ucred->cr_groups, p->p_ucred->cr_ngroups * 2036 sizeof(gid_t)); 2037 } 2038 *sizep = size; 2039 } 2040 2041 static void 2042 note_procstat_umask(void *arg, struct sbuf *sb, size_t *sizep) 2043 { 2044 struct proc *p; 2045 size_t size; 2046 int structsize; 2047 2048 p = (struct proc *)arg; 2049 size = sizeof(structsize) + sizeof(p->p_fd->fd_cmask); 2050 if (sb != NULL) { 2051 KASSERT(*sizep == size, ("invalid size")); 2052 structsize = sizeof(p->p_fd->fd_cmask); 2053 sbuf_bcat(sb, &structsize, sizeof(structsize)); 2054 sbuf_bcat(sb, &p->p_fd->fd_cmask, sizeof(p->p_fd->fd_cmask)); 2055 } 2056 *sizep = size; 2057 } 2058 2059 static void 2060 note_procstat_rlimit(void *arg, struct sbuf *sb, size_t *sizep) 2061 { 2062 struct proc *p; 2063 struct rlimit rlim[RLIM_NLIMITS]; 2064 size_t size; 2065 int structsize, i; 2066 2067 p = (struct proc *)arg; 2068 size = sizeof(structsize) + sizeof(rlim); 2069 if (sb != NULL) { 2070 KASSERT(*sizep == size, ("invalid size")); 2071 structsize = sizeof(rlim); 2072 sbuf_bcat(sb, &structsize, sizeof(structsize)); 2073 PROC_LOCK(p); 2074 for (i = 0; i < RLIM_NLIMITS; i++) 2075 lim_rlimit_proc(p, i, &rlim[i]); 2076 PROC_UNLOCK(p); 2077 sbuf_bcat(sb, rlim, sizeof(rlim)); 2078 } 2079 *sizep = size; 2080 } 2081 2082 static void 2083 note_procstat_osrel(void *arg, struct sbuf *sb, size_t *sizep) 2084 { 2085 struct proc *p; 2086 size_t size; 2087 int structsize; 2088 2089 p = (struct proc *)arg; 2090 size = sizeof(structsize) + sizeof(p->p_osrel); 2091 if (sb != NULL) { 2092 KASSERT(*sizep == size, ("invalid size")); 2093 structsize = sizeof(p->p_osrel); 2094 sbuf_bcat(sb, &structsize, sizeof(structsize)); 2095 sbuf_bcat(sb, &p->p_osrel, sizeof(p->p_osrel)); 2096 } 2097 *sizep = size; 2098 } 2099 2100 static void 2101 __elfN(note_procstat_psstrings)(void *arg, struct sbuf *sb, size_t *sizep) 2102 { 2103 struct proc *p; 2104 elf_ps_strings_t ps_strings; 2105 size_t size; 2106 int structsize; 2107 2108 p = (struct proc *)arg; 2109 size = sizeof(structsize) + sizeof(ps_strings); 2110 if (sb != NULL) { 2111 KASSERT(*sizep == size, ("invalid size")); 2112 structsize = sizeof(ps_strings); 2113 #if defined(COMPAT_FREEBSD32) && __ELF_WORD_SIZE == 32 2114 ps_strings = PTROUT(p->p_sysent->sv_psstrings); 2115 #else 2116 ps_strings = p->p_sysent->sv_psstrings; 2117 #endif 2118 sbuf_bcat(sb, &structsize, sizeof(structsize)); 2119 sbuf_bcat(sb, &ps_strings, sizeof(ps_strings)); 2120 } 2121 *sizep = size; 2122 } 2123 2124 static void 2125 __elfN(note_procstat_auxv)(void *arg, struct sbuf *sb, size_t *sizep) 2126 { 2127 struct proc *p; 2128 size_t size; 2129 int structsize; 2130 2131 p = (struct proc *)arg; 2132 if (sb == NULL) { 2133 size = 0; 2134 sb = sbuf_new(NULL, NULL, 128, SBUF_FIXEDLEN); 2135 sbuf_set_drain(sb, sbuf_drain_count, &size); 2136 sbuf_bcat(sb, &structsize, sizeof(structsize)); 2137 PHOLD(p); 2138 proc_getauxv(curthread, p, sb); 2139 PRELE(p); 2140 sbuf_finish(sb); 2141 sbuf_delete(sb); 2142 *sizep = size; 2143 } else { 2144 structsize = sizeof(Elf_Auxinfo); 2145 sbuf_bcat(sb, &structsize, sizeof(structsize)); 2146 PHOLD(p); 2147 proc_getauxv(curthread, p, sb); 2148 PRELE(p); 2149 } 2150 } 2151 2152 static boolean_t 2153 __elfN(parse_notes)(struct image_params *imgp, Elf_Brandnote *checknote, 2154 int32_t *osrel, const Elf_Phdr *pnote) 2155 { 2156 const Elf_Note *note, *note0, *note_end; 2157 const char *note_name; 2158 char *buf; 2159 int i, error; 2160 boolean_t res; 2161 2162 /* We need some limit, might as well use PAGE_SIZE. */ 2163 if (pnote == NULL || pnote->p_filesz > PAGE_SIZE) 2164 return (FALSE); 2165 ASSERT_VOP_LOCKED(imgp->vp, "parse_notes"); 2166 if (pnote->p_offset > PAGE_SIZE || 2167 pnote->p_filesz > PAGE_SIZE - pnote->p_offset) { 2168 VOP_UNLOCK(imgp->vp, 0); 2169 buf = malloc(pnote->p_filesz, M_TEMP, M_WAITOK); 2170 vn_lock(imgp->vp, LK_EXCLUSIVE | LK_RETRY); 2171 error = vn_rdwr(UIO_READ, imgp->vp, buf, pnote->p_filesz, 2172 pnote->p_offset, UIO_SYSSPACE, IO_NODELOCKED, 2173 curthread->td_ucred, NOCRED, NULL, curthread); 2174 if (error != 0) { 2175 uprintf("i/o error PT_NOTE\n"); 2176 res = FALSE; 2177 goto ret; 2178 } 2179 note = note0 = (const Elf_Note *)buf; 2180 note_end = (const Elf_Note *)(buf + pnote->p_filesz); 2181 } else { 2182 note = note0 = (const Elf_Note *)(imgp->image_header + 2183 pnote->p_offset); 2184 note_end = (const Elf_Note *)(imgp->image_header + 2185 pnote->p_offset + pnote->p_filesz); 2186 buf = NULL; 2187 } 2188 for (i = 0; i < 100 && note >= note0 && note < note_end; i++) { 2189 if (!aligned(note, Elf32_Addr) || (const char *)note_end - 2190 (const char *)note < sizeof(Elf_Note)) { 2191 res = FALSE; 2192 goto ret; 2193 } 2194 if (note->n_namesz != checknote->hdr.n_namesz || 2195 note->n_descsz != checknote->hdr.n_descsz || 2196 note->n_type != checknote->hdr.n_type) 2197 goto nextnote; 2198 note_name = (const char *)(note + 1); 2199 if (note_name + checknote->hdr.n_namesz >= 2200 (const char *)note_end || strncmp(checknote->vendor, 2201 note_name, checknote->hdr.n_namesz) != 0) 2202 goto nextnote; 2203 2204 /* 2205 * Fetch the osreldate for binary 2206 * from the ELF OSABI-note if necessary. 2207 */ 2208 if ((checknote->flags & BN_TRANSLATE_OSREL) != 0 && 2209 checknote->trans_osrel != NULL) { 2210 res = checknote->trans_osrel(note, osrel); 2211 goto ret; 2212 } 2213 res = TRUE; 2214 goto ret; 2215 nextnote: 2216 note = (const Elf_Note *)((const char *)(note + 1) + 2217 roundup2(note->n_namesz, ELF_NOTE_ROUNDSIZE) + 2218 roundup2(note->n_descsz, ELF_NOTE_ROUNDSIZE)); 2219 } 2220 res = FALSE; 2221 ret: 2222 free(buf, M_TEMP); 2223 return (res); 2224 } 2225 2226 /* 2227 * Try to find the appropriate ABI-note section for checknote, 2228 * fetch the osreldate for binary from the ELF OSABI-note. Only the 2229 * first page of the image is searched, the same as for headers. 2230 */ 2231 static boolean_t 2232 __elfN(check_note)(struct image_params *imgp, Elf_Brandnote *checknote, 2233 int32_t *osrel) 2234 { 2235 const Elf_Phdr *phdr; 2236 const Elf_Ehdr *hdr; 2237 int i; 2238 2239 hdr = (const Elf_Ehdr *)imgp->image_header; 2240 phdr = (const Elf_Phdr *)(imgp->image_header + hdr->e_phoff); 2241 2242 for (i = 0; i < hdr->e_phnum; i++) { 2243 if (phdr[i].p_type == PT_NOTE && 2244 __elfN(parse_notes)(imgp, checknote, osrel, &phdr[i])) 2245 return (TRUE); 2246 } 2247 return (FALSE); 2248 2249 } 2250 2251 /* 2252 * Tell kern_execve.c about it, with a little help from the linker. 2253 */ 2254 static struct execsw __elfN(execsw) = { 2255 __CONCAT(exec_, __elfN(imgact)), 2256 __XSTRING(__CONCAT(ELF, __ELF_WORD_SIZE)) 2257 }; 2258 EXEC_SET(__CONCAT(elf, __ELF_WORD_SIZE), __elfN(execsw)); 2259 2260 static vm_prot_t 2261 __elfN(trans_prot)(Elf_Word flags) 2262 { 2263 vm_prot_t prot; 2264 2265 prot = 0; 2266 if (flags & PF_X) 2267 prot |= VM_PROT_EXECUTE; 2268 if (flags & PF_W) 2269 prot |= VM_PROT_WRITE; 2270 if (flags & PF_R) 2271 prot |= VM_PROT_READ; 2272 #if __ELF_WORD_SIZE == 32 2273 #if defined(__amd64__) 2274 if (i386_read_exec && (flags & PF_R)) 2275 prot |= VM_PROT_EXECUTE; 2276 #endif 2277 #endif 2278 return (prot); 2279 } 2280 2281 static Elf_Word 2282 __elfN(untrans_prot)(vm_prot_t prot) 2283 { 2284 Elf_Word flags; 2285 2286 flags = 0; 2287 if (prot & VM_PROT_EXECUTE) 2288 flags |= PF_X; 2289 if (prot & VM_PROT_READ) 2290 flags |= PF_R; 2291 if (prot & VM_PROT_WRITE) 2292 flags |= PF_W; 2293 return (flags); 2294 } 2295