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 #ifdef __arm__ 84 #include <machine/acle-compat.h> 85 #endif 86 87 #define ELF_NOTE_ROUNDSIZE 4 88 #define OLD_EI_BRAND 8 89 90 static int __elfN(check_header)(const Elf_Ehdr *hdr); 91 static Elf_Brandinfo *__elfN(get_brandinfo)(struct image_params *imgp, 92 const char *interp, int interp_name_len, int32_t *osrel); 93 static int __elfN(load_file)(struct proc *p, const char *file, u_long *addr, 94 u_long *entry, size_t pagesize); 95 static int __elfN(load_section)(struct image_params *imgp, vm_offset_t offset, 96 caddr_t vmaddr, size_t memsz, size_t filsz, vm_prot_t prot, 97 size_t pagesize); 98 static int __CONCAT(exec_, __elfN(imgact))(struct image_params *imgp); 99 static boolean_t __elfN(freebsd_trans_osrel)(const Elf_Note *note, 100 int32_t *osrel); 101 static boolean_t kfreebsd_trans_osrel(const Elf_Note *note, int32_t *osrel); 102 static boolean_t __elfN(check_note)(struct image_params *imgp, 103 Elf_Brandnote *checknote, int32_t *osrel); 104 static vm_prot_t __elfN(trans_prot)(Elf_Word); 105 static Elf_Word __elfN(untrans_prot)(vm_prot_t); 106 107 SYSCTL_NODE(_kern, OID_AUTO, __CONCAT(elf, __ELF_WORD_SIZE), CTLFLAG_RW, 0, 108 ""); 109 110 #define CORE_BUF_SIZE (16 * 1024) 111 112 int __elfN(fallback_brand) = -1; 113 SYSCTL_INT(__CONCAT(_kern_elf, __ELF_WORD_SIZE), OID_AUTO, 114 fallback_brand, CTLFLAG_RWTUN, &__elfN(fallback_brand), 0, 115 __XSTRING(__CONCAT(ELF, __ELF_WORD_SIZE)) " brand of last resort"); 116 117 static int elf_legacy_coredump = 0; 118 SYSCTL_INT(_debug, OID_AUTO, __elfN(legacy_coredump), CTLFLAG_RW, 119 &elf_legacy_coredump, 0, ""); 120 121 int __elfN(nxstack) = 122 #if defined(__amd64__) || defined(__powerpc64__) /* both 64 and 32 bit */ || \ 123 (defined(__arm__) && __ARM_ARCH >= 7) || defined(__aarch64__) 124 1; 125 #else 126 0; 127 #endif 128 SYSCTL_INT(__CONCAT(_kern_elf, __ELF_WORD_SIZE), OID_AUTO, 129 nxstack, CTLFLAG_RW, &__elfN(nxstack), 0, 130 __XSTRING(__CONCAT(ELF, __ELF_WORD_SIZE)) ": enable non-executable stack"); 131 132 #if __ELF_WORD_SIZE == 32 133 #if defined(__amd64__) 134 int i386_read_exec = 0; 135 SYSCTL_INT(_kern_elf32, OID_AUTO, read_exec, CTLFLAG_RW, &i386_read_exec, 0, 136 "enable execution from readable segments"); 137 #endif 138 #endif 139 140 static Elf_Brandinfo *elf_brand_list[MAX_BRANDS]; 141 142 #define trunc_page_ps(va, ps) ((va) & ~(ps - 1)) 143 #define round_page_ps(va, ps) (((va) + (ps - 1)) & ~(ps - 1)) 144 #define aligned(a, t) (trunc_page_ps((u_long)(a), sizeof(t)) == (u_long)(a)) 145 146 static const char FREEBSD_ABI_VENDOR[] = "FreeBSD"; 147 148 Elf_Brandnote __elfN(freebsd_brandnote) = { 149 .hdr.n_namesz = sizeof(FREEBSD_ABI_VENDOR), 150 .hdr.n_descsz = sizeof(int32_t), 151 .hdr.n_type = NT_FREEBSD_ABI_TAG, 152 .vendor = FREEBSD_ABI_VENDOR, 153 .flags = BN_TRANSLATE_OSREL, 154 .trans_osrel = __elfN(freebsd_trans_osrel) 155 }; 156 157 static boolean_t 158 __elfN(freebsd_trans_osrel)(const Elf_Note *note, int32_t *osrel) 159 { 160 uintptr_t p; 161 162 p = (uintptr_t)(note + 1); 163 p += roundup2(note->n_namesz, ELF_NOTE_ROUNDSIZE); 164 *osrel = *(const int32_t *)(p); 165 166 return (TRUE); 167 } 168 169 static const char GNU_ABI_VENDOR[] = "GNU"; 170 static int GNU_KFREEBSD_ABI_DESC = 3; 171 172 Elf_Brandnote __elfN(kfreebsd_brandnote) = { 173 .hdr.n_namesz = sizeof(GNU_ABI_VENDOR), 174 .hdr.n_descsz = 16, /* XXX at least 16 */ 175 .hdr.n_type = 1, 176 .vendor = GNU_ABI_VENDOR, 177 .flags = BN_TRANSLATE_OSREL, 178 .trans_osrel = kfreebsd_trans_osrel 179 }; 180 181 static boolean_t 182 kfreebsd_trans_osrel(const Elf_Note *note, int32_t *osrel) 183 { 184 const Elf32_Word *desc; 185 uintptr_t p; 186 187 p = (uintptr_t)(note + 1); 188 p += roundup2(note->n_namesz, ELF_NOTE_ROUNDSIZE); 189 190 desc = (const Elf32_Word *)p; 191 if (desc[0] != GNU_KFREEBSD_ABI_DESC) 192 return (FALSE); 193 194 /* 195 * Debian GNU/kFreeBSD embed the earliest compatible kernel version 196 * (__FreeBSD_version: <major><two digit minor>Rxx) in the LSB way. 197 */ 198 *osrel = desc[1] * 100000 + desc[2] * 1000 + desc[3]; 199 200 return (TRUE); 201 } 202 203 int 204 __elfN(insert_brand_entry)(Elf_Brandinfo *entry) 205 { 206 int i; 207 208 for (i = 0; i < MAX_BRANDS; i++) { 209 if (elf_brand_list[i] == NULL) { 210 elf_brand_list[i] = entry; 211 break; 212 } 213 } 214 if (i == MAX_BRANDS) { 215 printf("WARNING: %s: could not insert brandinfo entry: %p\n", 216 __func__, entry); 217 return (-1); 218 } 219 return (0); 220 } 221 222 int 223 __elfN(remove_brand_entry)(Elf_Brandinfo *entry) 224 { 225 int i; 226 227 for (i = 0; i < MAX_BRANDS; i++) { 228 if (elf_brand_list[i] == entry) { 229 elf_brand_list[i] = NULL; 230 break; 231 } 232 } 233 if (i == MAX_BRANDS) 234 return (-1); 235 return (0); 236 } 237 238 int 239 __elfN(brand_inuse)(Elf_Brandinfo *entry) 240 { 241 struct proc *p; 242 int rval = FALSE; 243 244 sx_slock(&allproc_lock); 245 FOREACH_PROC_IN_SYSTEM(p) { 246 if (p->p_sysent == entry->sysvec) { 247 rval = TRUE; 248 break; 249 } 250 } 251 sx_sunlock(&allproc_lock); 252 253 return (rval); 254 } 255 256 static Elf_Brandinfo * 257 __elfN(get_brandinfo)(struct image_params *imgp, const char *interp, 258 int interp_name_len, int32_t *osrel) 259 { 260 const Elf_Ehdr *hdr = (const Elf_Ehdr *)imgp->image_header; 261 Elf_Brandinfo *bi; 262 boolean_t ret; 263 int i; 264 265 /* 266 * We support four types of branding -- (1) the ELF EI_OSABI field 267 * that SCO added to the ELF spec, (2) FreeBSD 3.x's traditional string 268 * branding w/in the ELF header, (3) path of the `interp_path' 269 * field, and (4) the ".note.ABI-tag" ELF section. 270 */ 271 272 /* Look for an ".note.ABI-tag" ELF section */ 273 for (i = 0; i < MAX_BRANDS; i++) { 274 bi = elf_brand_list[i]; 275 if (bi == NULL) 276 continue; 277 if (hdr->e_machine == bi->machine && (bi->flags & 278 (BI_BRAND_NOTE|BI_BRAND_NOTE_MANDATORY)) != 0) { 279 ret = __elfN(check_note)(imgp, bi->brand_note, osrel); 280 /* Give brand a chance to veto check_note's guess */ 281 if (ret && bi->header_supported) 282 ret = bi->header_supported(imgp); 283 if (ret) 284 return (bi); 285 } 286 } 287 288 /* If the executable has a brand, search for it in the brand list. */ 289 for (i = 0; i < MAX_BRANDS; i++) { 290 bi = elf_brand_list[i]; 291 if (bi == NULL || bi->flags & BI_BRAND_NOTE_MANDATORY) 292 continue; 293 if (hdr->e_machine == bi->machine && 294 (hdr->e_ident[EI_OSABI] == bi->brand || 295 strncmp((const char *)&hdr->e_ident[OLD_EI_BRAND], 296 bi->compat_3_brand, strlen(bi->compat_3_brand)) == 0)) { 297 /* Looks good, but give brand a chance to veto */ 298 if (!bi->header_supported || bi->header_supported(imgp)) 299 return (bi); 300 } 301 } 302 303 /* No known brand, see if the header is recognized by any brand */ 304 for (i = 0; i < MAX_BRANDS; i++) { 305 bi = elf_brand_list[i]; 306 if (bi == NULL || bi->flags & BI_BRAND_NOTE_MANDATORY || 307 bi->header_supported == NULL) 308 continue; 309 if (hdr->e_machine == bi->machine) { 310 ret = bi->header_supported(imgp); 311 if (ret) 312 return (bi); 313 } 314 } 315 316 /* Lacking a known brand, search for a recognized interpreter. */ 317 if (interp != NULL) { 318 for (i = 0; i < MAX_BRANDS; i++) { 319 bi = elf_brand_list[i]; 320 if (bi == NULL || bi->flags & BI_BRAND_NOTE_MANDATORY) 321 continue; 322 if (hdr->e_machine == bi->machine && 323 /* ELF image p_filesz includes terminating zero */ 324 strlen(bi->interp_path) + 1 == interp_name_len && 325 strncmp(interp, bi->interp_path, interp_name_len) 326 == 0) 327 return (bi); 328 } 329 } 330 331 /* Lacking a recognized interpreter, try the default brand */ 332 for (i = 0; i < MAX_BRANDS; i++) { 333 bi = elf_brand_list[i]; 334 if (bi == NULL || bi->flags & BI_BRAND_NOTE_MANDATORY) 335 continue; 336 if (hdr->e_machine == bi->machine && 337 __elfN(fallback_brand) == bi->brand) 338 return (bi); 339 } 340 return (NULL); 341 } 342 343 static int 344 __elfN(check_header)(const Elf_Ehdr *hdr) 345 { 346 Elf_Brandinfo *bi; 347 int i; 348 349 if (!IS_ELF(*hdr) || 350 hdr->e_ident[EI_CLASS] != ELF_TARG_CLASS || 351 hdr->e_ident[EI_DATA] != ELF_TARG_DATA || 352 hdr->e_ident[EI_VERSION] != EV_CURRENT || 353 hdr->e_phentsize != sizeof(Elf_Phdr) || 354 hdr->e_version != ELF_TARG_VER) 355 return (ENOEXEC); 356 357 /* 358 * Make sure we have at least one brand for this machine. 359 */ 360 361 for (i = 0; i < MAX_BRANDS; i++) { 362 bi = elf_brand_list[i]; 363 if (bi != NULL && bi->machine == hdr->e_machine) 364 break; 365 } 366 if (i == MAX_BRANDS) 367 return (ENOEXEC); 368 369 return (0); 370 } 371 372 static int 373 __elfN(map_partial)(vm_map_t map, vm_object_t object, vm_ooffset_t offset, 374 vm_offset_t start, vm_offset_t end, vm_prot_t prot) 375 { 376 struct sf_buf *sf; 377 int error; 378 vm_offset_t off; 379 380 /* 381 * Create the page if it doesn't exist yet. Ignore errors. 382 */ 383 vm_map_lock(map); 384 vm_map_insert(map, NULL, 0, trunc_page(start), round_page(end), 385 VM_PROT_ALL, VM_PROT_ALL, 0); 386 vm_map_unlock(map); 387 388 /* 389 * Find the page from the underlying object. 390 */ 391 if (object) { 392 sf = vm_imgact_map_page(object, offset); 393 if (sf == NULL) 394 return (KERN_FAILURE); 395 off = offset - trunc_page(offset); 396 error = copyout((caddr_t)sf_buf_kva(sf) + off, (caddr_t)start, 397 end - start); 398 vm_imgact_unmap_page(sf); 399 if (error) { 400 return (KERN_FAILURE); 401 } 402 } 403 404 return (KERN_SUCCESS); 405 } 406 407 static int 408 __elfN(map_insert)(vm_map_t map, vm_object_t object, vm_ooffset_t offset, 409 vm_offset_t start, vm_offset_t end, vm_prot_t prot, int cow) 410 { 411 struct sf_buf *sf; 412 vm_offset_t off; 413 vm_size_t sz; 414 int error, rv; 415 416 if (start != trunc_page(start)) { 417 rv = __elfN(map_partial)(map, object, offset, start, 418 round_page(start), prot); 419 if (rv) 420 return (rv); 421 offset += round_page(start) - start; 422 start = round_page(start); 423 } 424 if (end != round_page(end)) { 425 rv = __elfN(map_partial)(map, object, offset + 426 trunc_page(end) - start, trunc_page(end), end, prot); 427 if (rv) 428 return (rv); 429 end = trunc_page(end); 430 } 431 if (end > start) { 432 if (offset & PAGE_MASK) { 433 /* 434 * The mapping is not page aligned. This means we have 435 * to copy the data. Sigh. 436 */ 437 rv = vm_map_find(map, NULL, 0, &start, end - start, 0, 438 VMFS_NO_SPACE, prot | VM_PROT_WRITE, VM_PROT_ALL, 439 0); 440 if (rv) 441 return (rv); 442 if (object == NULL) 443 return (KERN_SUCCESS); 444 for (; start < end; start += sz) { 445 sf = vm_imgact_map_page(object, offset); 446 if (sf == NULL) 447 return (KERN_FAILURE); 448 off = offset - trunc_page(offset); 449 sz = end - start; 450 if (sz > PAGE_SIZE - off) 451 sz = PAGE_SIZE - off; 452 error = copyout((caddr_t)sf_buf_kva(sf) + off, 453 (caddr_t)start, sz); 454 vm_imgact_unmap_page(sf); 455 if (error) { 456 return (KERN_FAILURE); 457 } 458 offset += sz; 459 } 460 rv = KERN_SUCCESS; 461 } else { 462 vm_object_reference(object); 463 vm_map_lock(map); 464 rv = vm_map_insert(map, object, offset, start, end, 465 prot, VM_PROT_ALL, cow); 466 vm_map_unlock(map); 467 if (rv != KERN_SUCCESS) 468 vm_object_deallocate(object); 469 } 470 return (rv); 471 } else { 472 return (KERN_SUCCESS); 473 } 474 } 475 476 static int 477 __elfN(load_section)(struct image_params *imgp, vm_offset_t offset, 478 caddr_t vmaddr, size_t memsz, size_t filsz, vm_prot_t prot, 479 size_t pagesize) 480 { 481 struct sf_buf *sf; 482 size_t map_len; 483 vm_map_t map; 484 vm_object_t object; 485 vm_offset_t map_addr; 486 int error, rv, cow; 487 size_t copy_len; 488 vm_offset_t file_addr; 489 490 /* 491 * It's necessary to fail if the filsz + offset taken from the 492 * header is greater than the actual file pager object's size. 493 * If we were to allow this, then the vm_map_find() below would 494 * walk right off the end of the file object and into the ether. 495 * 496 * While I'm here, might as well check for something else that 497 * is invalid: filsz cannot be greater than memsz. 498 */ 499 if ((off_t)filsz + offset > imgp->attr->va_size || filsz > memsz) { 500 uprintf("elf_load_section: truncated ELF file\n"); 501 return (ENOEXEC); 502 } 503 504 object = imgp->object; 505 map = &imgp->proc->p_vmspace->vm_map; 506 map_addr = trunc_page_ps((vm_offset_t)vmaddr, pagesize); 507 file_addr = trunc_page_ps(offset, pagesize); 508 509 /* 510 * We have two choices. We can either clear the data in the last page 511 * of an oversized mapping, or we can start the anon mapping a page 512 * early and copy the initialized data into that first page. We 513 * choose the second.. 514 */ 515 if (memsz > filsz) 516 map_len = trunc_page_ps(offset + filsz, pagesize) - file_addr; 517 else 518 map_len = round_page_ps(offset + filsz, pagesize) - file_addr; 519 520 if (map_len != 0) { 521 /* cow flags: don't dump readonly sections in core */ 522 cow = MAP_COPY_ON_WRITE | MAP_PREFAULT | 523 (prot & VM_PROT_WRITE ? 0 : MAP_DISABLE_COREDUMP); 524 525 rv = __elfN(map_insert)(map, 526 object, 527 file_addr, /* file offset */ 528 map_addr, /* virtual start */ 529 map_addr + map_len,/* virtual end */ 530 prot, 531 cow); 532 if (rv != KERN_SUCCESS) 533 return (EINVAL); 534 535 /* we can stop now if we've covered it all */ 536 if (memsz == filsz) { 537 return (0); 538 } 539 } 540 541 542 /* 543 * We have to get the remaining bit of the file into the first part 544 * of the oversized map segment. This is normally because the .data 545 * segment in the file is extended to provide bss. It's a neat idea 546 * to try and save a page, but it's a pain in the behind to implement. 547 */ 548 copy_len = (offset + filsz) - trunc_page_ps(offset + filsz, pagesize); 549 map_addr = trunc_page_ps((vm_offset_t)vmaddr + filsz, pagesize); 550 map_len = round_page_ps((vm_offset_t)vmaddr + memsz, pagesize) - 551 map_addr; 552 553 /* This had damn well better be true! */ 554 if (map_len != 0) { 555 rv = __elfN(map_insert)(map, NULL, 0, map_addr, map_addr + 556 map_len, VM_PROT_ALL, 0); 557 if (rv != KERN_SUCCESS) { 558 return (EINVAL); 559 } 560 } 561 562 if (copy_len != 0) { 563 vm_offset_t off; 564 565 sf = vm_imgact_map_page(object, offset + filsz); 566 if (sf == NULL) 567 return (EIO); 568 569 /* send the page fragment to user space */ 570 off = trunc_page_ps(offset + filsz, pagesize) - 571 trunc_page(offset + filsz); 572 error = copyout((caddr_t)sf_buf_kva(sf) + off, 573 (caddr_t)map_addr, copy_len); 574 vm_imgact_unmap_page(sf); 575 if (error) { 576 return (error); 577 } 578 } 579 580 /* 581 * set it to the specified protection. 582 * XXX had better undo the damage from pasting over the cracks here! 583 */ 584 vm_map_protect(map, trunc_page(map_addr), round_page(map_addr + 585 map_len), prot, FALSE); 586 587 return (0); 588 } 589 590 /* 591 * Load the file "file" into memory. It may be either a shared object 592 * or an executable. 593 * 594 * The "addr" reference parameter is in/out. On entry, it specifies 595 * the address where a shared object should be loaded. If the file is 596 * an executable, this value is ignored. On exit, "addr" specifies 597 * where the file was actually loaded. 598 * 599 * The "entry" reference parameter is out only. On exit, it specifies 600 * the entry point for the loaded file. 601 */ 602 static int 603 __elfN(load_file)(struct proc *p, const char *file, u_long *addr, 604 u_long *entry, size_t pagesize) 605 { 606 struct { 607 struct nameidata nd; 608 struct vattr attr; 609 struct image_params image_params; 610 } *tempdata; 611 const Elf_Ehdr *hdr = NULL; 612 const Elf_Phdr *phdr = NULL; 613 struct nameidata *nd; 614 struct vattr *attr; 615 struct image_params *imgp; 616 vm_prot_t prot; 617 u_long rbase; 618 u_long base_addr = 0; 619 int error, i, numsegs; 620 621 #ifdef CAPABILITY_MODE 622 /* 623 * XXXJA: This check can go away once we are sufficiently confident 624 * that the checks in namei() are correct. 625 */ 626 if (IN_CAPABILITY_MODE(curthread)) 627 return (ECAPMODE); 628 #endif 629 630 tempdata = malloc(sizeof(*tempdata), M_TEMP, M_WAITOK); 631 nd = &tempdata->nd; 632 attr = &tempdata->attr; 633 imgp = &tempdata->image_params; 634 635 /* 636 * Initialize part of the common data 637 */ 638 imgp->proc = p; 639 imgp->attr = attr; 640 imgp->firstpage = NULL; 641 imgp->image_header = NULL; 642 imgp->object = NULL; 643 imgp->execlabel = NULL; 644 645 NDINIT(nd, LOOKUP, LOCKLEAF | FOLLOW, UIO_SYSSPACE, file, curthread); 646 if ((error = namei(nd)) != 0) { 647 nd->ni_vp = NULL; 648 goto fail; 649 } 650 NDFREE(nd, NDF_ONLY_PNBUF); 651 imgp->vp = nd->ni_vp; 652 653 /* 654 * Check permissions, modes, uid, etc on the file, and "open" it. 655 */ 656 error = exec_check_permissions(imgp); 657 if (error) 658 goto fail; 659 660 error = exec_map_first_page(imgp); 661 if (error) 662 goto fail; 663 664 /* 665 * Also make certain that the interpreter stays the same, so set 666 * its VV_TEXT flag, too. 667 */ 668 VOP_SET_TEXT(nd->ni_vp); 669 670 imgp->object = nd->ni_vp->v_object; 671 672 hdr = (const Elf_Ehdr *)imgp->image_header; 673 if ((error = __elfN(check_header)(hdr)) != 0) 674 goto fail; 675 if (hdr->e_type == ET_DYN) 676 rbase = *addr; 677 else if (hdr->e_type == ET_EXEC) 678 rbase = 0; 679 else { 680 error = ENOEXEC; 681 goto fail; 682 } 683 684 /* Only support headers that fit within first page for now */ 685 if ((hdr->e_phoff > PAGE_SIZE) || 686 (u_int)hdr->e_phentsize * hdr->e_phnum > PAGE_SIZE - hdr->e_phoff) { 687 error = ENOEXEC; 688 goto fail; 689 } 690 691 phdr = (const Elf_Phdr *)(imgp->image_header + hdr->e_phoff); 692 if (!aligned(phdr, Elf_Addr)) { 693 error = ENOEXEC; 694 goto fail; 695 } 696 697 for (i = 0, numsegs = 0; i < hdr->e_phnum; i++) { 698 if (phdr[i].p_type == PT_LOAD && phdr[i].p_memsz != 0) { 699 /* Loadable segment */ 700 prot = __elfN(trans_prot)(phdr[i].p_flags); 701 error = __elfN(load_section)(imgp, phdr[i].p_offset, 702 (caddr_t)(uintptr_t)phdr[i].p_vaddr + rbase, 703 phdr[i].p_memsz, phdr[i].p_filesz, prot, pagesize); 704 if (error != 0) 705 goto fail; 706 /* 707 * Establish the base address if this is the 708 * first segment. 709 */ 710 if (numsegs == 0) 711 base_addr = trunc_page(phdr[i].p_vaddr + 712 rbase); 713 numsegs++; 714 } 715 } 716 *addr = base_addr; 717 *entry = (unsigned long)hdr->e_entry + rbase; 718 719 fail: 720 if (imgp->firstpage) 721 exec_unmap_first_page(imgp); 722 723 if (nd->ni_vp) 724 vput(nd->ni_vp); 725 726 free(tempdata, M_TEMP); 727 728 return (error); 729 } 730 731 static int 732 __CONCAT(exec_, __elfN(imgact))(struct image_params *imgp) 733 { 734 struct thread *td; 735 const Elf_Ehdr *hdr; 736 const Elf_Phdr *phdr; 737 Elf_Auxargs *elf_auxargs; 738 struct vmspace *vmspace; 739 const char *err_str, *newinterp; 740 char *interp, *interp_buf, *path; 741 Elf_Brandinfo *brand_info; 742 struct sysentvec *sv; 743 vm_prot_t prot; 744 u_long text_size, data_size, total_size, text_addr, data_addr; 745 u_long seg_size, seg_addr, addr, baddr, et_dyn_addr, entry, proghdr; 746 int32_t osrel; 747 int error, i, n, interp_name_len, have_interp; 748 749 hdr = (const Elf_Ehdr *)imgp->image_header; 750 751 /* 752 * Do we have a valid ELF header ? 753 * 754 * Only allow ET_EXEC & ET_DYN here, reject ET_DYN later 755 * if particular brand doesn't support it. 756 */ 757 if (__elfN(check_header)(hdr) != 0 || 758 (hdr->e_type != ET_EXEC && hdr->e_type != ET_DYN)) 759 return (-1); 760 761 /* 762 * From here on down, we return an errno, not -1, as we've 763 * detected an ELF file. 764 */ 765 766 if ((hdr->e_phoff > PAGE_SIZE) || 767 (u_int)hdr->e_phentsize * hdr->e_phnum > PAGE_SIZE - hdr->e_phoff) { 768 /* Only support headers in first page for now */ 769 uprintf("Program headers not in the first page\n"); 770 return (ENOEXEC); 771 } 772 phdr = (const Elf_Phdr *)(imgp->image_header + hdr->e_phoff); 773 if (!aligned(phdr, Elf_Addr)) { 774 uprintf("Unaligned program headers\n"); 775 return (ENOEXEC); 776 } 777 778 n = error = 0; 779 baddr = 0; 780 osrel = 0; 781 text_size = data_size = total_size = text_addr = data_addr = 0; 782 entry = proghdr = 0; 783 interp_name_len = 0; 784 err_str = newinterp = NULL; 785 interp = interp_buf = NULL; 786 td = curthread; 787 788 for (i = 0; i < hdr->e_phnum; i++) { 789 switch (phdr[i].p_type) { 790 case PT_LOAD: 791 if (n == 0) 792 baddr = phdr[i].p_vaddr; 793 n++; 794 break; 795 case PT_INTERP: 796 /* Path to interpreter */ 797 if (phdr[i].p_filesz > MAXPATHLEN) { 798 uprintf("Invalid PT_INTERP\n"); 799 error = ENOEXEC; 800 goto ret; 801 } 802 interp_name_len = phdr[i].p_filesz; 803 if (phdr[i].p_offset > PAGE_SIZE || 804 interp_name_len > PAGE_SIZE - phdr[i].p_offset) { 805 VOP_UNLOCK(imgp->vp, 0); 806 interp_buf = malloc(interp_name_len + 1, M_TEMP, 807 M_WAITOK); 808 vn_lock(imgp->vp, LK_EXCLUSIVE | LK_RETRY); 809 error = vn_rdwr(UIO_READ, imgp->vp, interp_buf, 810 interp_name_len, phdr[i].p_offset, 811 UIO_SYSSPACE, IO_NODELOCKED, td->td_ucred, 812 NOCRED, NULL, td); 813 if (error != 0) { 814 uprintf("i/o error PT_INTERP\n"); 815 goto ret; 816 } 817 interp_buf[interp_name_len] = '\0'; 818 interp = interp_buf; 819 } else { 820 interp = __DECONST(char *, imgp->image_header) + 821 phdr[i].p_offset; 822 } 823 break; 824 case PT_GNU_STACK: 825 if (__elfN(nxstack)) 826 imgp->stack_prot = 827 __elfN(trans_prot)(phdr[i].p_flags); 828 imgp->stack_sz = phdr[i].p_memsz; 829 break; 830 } 831 } 832 833 brand_info = __elfN(get_brandinfo)(imgp, interp, interp_name_len, 834 &osrel); 835 if (brand_info == NULL) { 836 uprintf("ELF binary type \"%u\" not known.\n", 837 hdr->e_ident[EI_OSABI]); 838 error = ENOEXEC; 839 goto ret; 840 } 841 if (hdr->e_type == ET_DYN) { 842 if ((brand_info->flags & BI_CAN_EXEC_DYN) == 0) { 843 uprintf("Cannot execute shared object\n"); 844 error = ENOEXEC; 845 goto ret; 846 } 847 /* 848 * Honour the base load address from the dso if it is 849 * non-zero for some reason. 850 */ 851 if (baddr == 0) 852 et_dyn_addr = ET_DYN_LOAD_ADDR; 853 else 854 et_dyn_addr = 0; 855 } else 856 et_dyn_addr = 0; 857 sv = brand_info->sysvec; 858 if (interp != NULL && brand_info->interp_newpath != NULL) 859 newinterp = brand_info->interp_newpath; 860 861 /* 862 * Avoid a possible deadlock if the current address space is destroyed 863 * and that address space maps the locked vnode. In the common case, 864 * the locked vnode's v_usecount is decremented but remains greater 865 * than zero. Consequently, the vnode lock is not needed by vrele(). 866 * However, in cases where the vnode lock is external, such as nullfs, 867 * v_usecount may become zero. 868 * 869 * The VV_TEXT flag prevents modifications to the executable while 870 * the vnode is unlocked. 871 */ 872 VOP_UNLOCK(imgp->vp, 0); 873 874 error = exec_new_vmspace(imgp, sv); 875 imgp->proc->p_sysent = sv; 876 877 vn_lock(imgp->vp, LK_EXCLUSIVE | LK_RETRY); 878 if (error != 0) 879 goto ret; 880 881 for (i = 0; i < hdr->e_phnum; i++) { 882 switch (phdr[i].p_type) { 883 case PT_LOAD: /* Loadable segment */ 884 if (phdr[i].p_memsz == 0) 885 break; 886 prot = __elfN(trans_prot)(phdr[i].p_flags); 887 error = __elfN(load_section)(imgp, phdr[i].p_offset, 888 (caddr_t)(uintptr_t)phdr[i].p_vaddr + et_dyn_addr, 889 phdr[i].p_memsz, phdr[i].p_filesz, prot, 890 sv->sv_pagesize); 891 if (error != 0) 892 goto ret; 893 894 /* 895 * If this segment contains the program headers, 896 * remember their virtual address for the AT_PHDR 897 * aux entry. Static binaries don't usually include 898 * a PT_PHDR entry. 899 */ 900 if (phdr[i].p_offset == 0 && 901 hdr->e_phoff + hdr->e_phnum * hdr->e_phentsize 902 <= phdr[i].p_filesz) 903 proghdr = phdr[i].p_vaddr + hdr->e_phoff + 904 et_dyn_addr; 905 906 seg_addr = trunc_page(phdr[i].p_vaddr + et_dyn_addr); 907 seg_size = round_page(phdr[i].p_memsz + 908 phdr[i].p_vaddr + et_dyn_addr - seg_addr); 909 910 /* 911 * Make the largest executable segment the official 912 * text segment and all others data. 913 * 914 * Note that obreak() assumes that data_addr + 915 * data_size == end of data load area, and the ELF 916 * file format expects segments to be sorted by 917 * address. If multiple data segments exist, the 918 * last one will be used. 919 */ 920 921 if (phdr[i].p_flags & PF_X && text_size < seg_size) { 922 text_size = seg_size; 923 text_addr = seg_addr; 924 } else { 925 data_size = seg_size; 926 data_addr = seg_addr; 927 } 928 total_size += seg_size; 929 break; 930 case PT_PHDR: /* Program header table info */ 931 proghdr = phdr[i].p_vaddr + et_dyn_addr; 932 break; 933 default: 934 break; 935 } 936 } 937 938 if (data_addr == 0 && data_size == 0) { 939 data_addr = text_addr; 940 data_size = text_size; 941 } 942 943 entry = (u_long)hdr->e_entry + et_dyn_addr; 944 945 /* 946 * Check limits. It should be safe to check the 947 * limits after loading the segments since we do 948 * not actually fault in all the segments pages. 949 */ 950 PROC_LOCK(imgp->proc); 951 if (data_size > lim_cur_proc(imgp->proc, RLIMIT_DATA)) 952 err_str = "Data segment size exceeds process limit"; 953 else if (text_size > maxtsiz) 954 err_str = "Text segment size exceeds system limit"; 955 else if (total_size > lim_cur_proc(imgp->proc, RLIMIT_VMEM)) 956 err_str = "Total segment size exceeds process limit"; 957 else if (racct_set(imgp->proc, RACCT_DATA, data_size) != 0) 958 err_str = "Data segment size exceeds resource limit"; 959 else if (racct_set(imgp->proc, RACCT_VMEM, total_size) != 0) 960 err_str = "Total segment size exceeds resource limit"; 961 if (err_str != NULL) { 962 PROC_UNLOCK(imgp->proc); 963 uprintf("%s\n", err_str); 964 error = ENOMEM; 965 goto ret; 966 } 967 968 vmspace = imgp->proc->p_vmspace; 969 vmspace->vm_tsize = text_size >> PAGE_SHIFT; 970 vmspace->vm_taddr = (caddr_t)(uintptr_t)text_addr; 971 vmspace->vm_dsize = data_size >> PAGE_SHIFT; 972 vmspace->vm_daddr = (caddr_t)(uintptr_t)data_addr; 973 974 /* 975 * We load the dynamic linker where a userland call 976 * to mmap(0, ...) would put it. The rationale behind this 977 * calculation is that it leaves room for the heap to grow to 978 * its maximum allowed size. 979 */ 980 addr = round_page((vm_offset_t)vmspace->vm_daddr + lim_max(td, 981 RLIMIT_DATA)); 982 PROC_UNLOCK(imgp->proc); 983 984 imgp->entry_addr = entry; 985 986 if (interp != NULL) { 987 have_interp = FALSE; 988 VOP_UNLOCK(imgp->vp, 0); 989 if (brand_info->emul_path != NULL && 990 brand_info->emul_path[0] != '\0') { 991 path = malloc(MAXPATHLEN, M_TEMP, M_WAITOK); 992 snprintf(path, MAXPATHLEN, "%s%s", 993 brand_info->emul_path, interp); 994 error = __elfN(load_file)(imgp->proc, path, &addr, 995 &imgp->entry_addr, sv->sv_pagesize); 996 free(path, M_TEMP); 997 if (error == 0) 998 have_interp = TRUE; 999 } 1000 if (!have_interp && newinterp != NULL) { 1001 error = __elfN(load_file)(imgp->proc, newinterp, &addr, 1002 &imgp->entry_addr, sv->sv_pagesize); 1003 if (error == 0) 1004 have_interp = TRUE; 1005 } 1006 if (!have_interp) { 1007 error = __elfN(load_file)(imgp->proc, interp, &addr, 1008 &imgp->entry_addr, sv->sv_pagesize); 1009 } 1010 vn_lock(imgp->vp, LK_EXCLUSIVE | LK_RETRY); 1011 if (error != 0) { 1012 uprintf("ELF interpreter %s not found\n", interp); 1013 goto ret; 1014 } 1015 } else 1016 addr = et_dyn_addr; 1017 1018 /* 1019 * Construct auxargs table (used by the fixup routine) 1020 */ 1021 elf_auxargs = malloc(sizeof(Elf_Auxargs), M_TEMP, M_WAITOK); 1022 elf_auxargs->execfd = -1; 1023 elf_auxargs->phdr = proghdr; 1024 elf_auxargs->phent = hdr->e_phentsize; 1025 elf_auxargs->phnum = hdr->e_phnum; 1026 elf_auxargs->pagesz = PAGE_SIZE; 1027 elf_auxargs->base = addr; 1028 elf_auxargs->flags = 0; 1029 elf_auxargs->entry = entry; 1030 elf_auxargs->hdr_eflags = hdr->e_flags; 1031 1032 imgp->auxargs = elf_auxargs; 1033 imgp->interpreted = 0; 1034 imgp->reloc_base = addr; 1035 imgp->proc->p_osrel = osrel; 1036 1037 ret: 1038 free(interp_buf, M_TEMP); 1039 return (error); 1040 } 1041 1042 #define suword __CONCAT(suword, __ELF_WORD_SIZE) 1043 1044 int 1045 __elfN(freebsd_fixup)(register_t **stack_base, struct image_params *imgp) 1046 { 1047 Elf_Auxargs *args = (Elf_Auxargs *)imgp->auxargs; 1048 Elf_Addr *base; 1049 Elf_Addr *pos; 1050 1051 base = (Elf_Addr *)*stack_base; 1052 pos = base + (imgp->args->argc + imgp->args->envc + 2); 1053 1054 if (args->execfd != -1) 1055 AUXARGS_ENTRY(pos, AT_EXECFD, args->execfd); 1056 AUXARGS_ENTRY(pos, AT_PHDR, args->phdr); 1057 AUXARGS_ENTRY(pos, AT_PHENT, args->phent); 1058 AUXARGS_ENTRY(pos, AT_PHNUM, args->phnum); 1059 AUXARGS_ENTRY(pos, AT_PAGESZ, args->pagesz); 1060 AUXARGS_ENTRY(pos, AT_FLAGS, args->flags); 1061 AUXARGS_ENTRY(pos, AT_ENTRY, args->entry); 1062 AUXARGS_ENTRY(pos, AT_BASE, args->base); 1063 #ifdef AT_EHDRFLAGS 1064 AUXARGS_ENTRY(pos, AT_EHDRFLAGS, args->hdr_eflags); 1065 #endif 1066 if (imgp->execpathp != 0) 1067 AUXARGS_ENTRY(pos, AT_EXECPATH, imgp->execpathp); 1068 AUXARGS_ENTRY(pos, AT_OSRELDATE, 1069 imgp->proc->p_ucred->cr_prison->pr_osreldate); 1070 if (imgp->canary != 0) { 1071 AUXARGS_ENTRY(pos, AT_CANARY, imgp->canary); 1072 AUXARGS_ENTRY(pos, AT_CANARYLEN, imgp->canarylen); 1073 } 1074 AUXARGS_ENTRY(pos, AT_NCPUS, mp_ncpus); 1075 if (imgp->pagesizes != 0) { 1076 AUXARGS_ENTRY(pos, AT_PAGESIZES, imgp->pagesizes); 1077 AUXARGS_ENTRY(pos, AT_PAGESIZESLEN, imgp->pagesizeslen); 1078 } 1079 if (imgp->sysent->sv_timekeep_base != 0) { 1080 AUXARGS_ENTRY(pos, AT_TIMEKEEP, 1081 imgp->sysent->sv_timekeep_base); 1082 } 1083 AUXARGS_ENTRY(pos, AT_STACKPROT, imgp->sysent->sv_shared_page_obj 1084 != NULL && imgp->stack_prot != 0 ? imgp->stack_prot : 1085 imgp->sysent->sv_stackprot); 1086 AUXARGS_ENTRY(pos, AT_NULL, 0); 1087 1088 free(imgp->auxargs, M_TEMP); 1089 imgp->auxargs = NULL; 1090 1091 base--; 1092 suword(base, (long)imgp->args->argc); 1093 *stack_base = (register_t *)base; 1094 return (0); 1095 } 1096 1097 /* 1098 * Code for generating ELF core dumps. 1099 */ 1100 1101 typedef void (*segment_callback)(vm_map_entry_t, void *); 1102 1103 /* Closure for cb_put_phdr(). */ 1104 struct phdr_closure { 1105 Elf_Phdr *phdr; /* Program header to fill in */ 1106 Elf_Off offset; /* Offset of segment in core file */ 1107 }; 1108 1109 /* Closure for cb_size_segment(). */ 1110 struct sseg_closure { 1111 int count; /* Count of writable segments. */ 1112 size_t size; /* Total size of all writable segments. */ 1113 }; 1114 1115 typedef void (*outfunc_t)(void *, struct sbuf *, size_t *); 1116 1117 struct note_info { 1118 int type; /* Note type. */ 1119 outfunc_t outfunc; /* Output function. */ 1120 void *outarg; /* Argument for the output function. */ 1121 size_t outsize; /* Output size. */ 1122 TAILQ_ENTRY(note_info) link; /* Link to the next note info. */ 1123 }; 1124 1125 TAILQ_HEAD(note_info_list, note_info); 1126 1127 /* Coredump output parameters. */ 1128 struct coredump_params { 1129 off_t offset; 1130 struct ucred *active_cred; 1131 struct ucred *file_cred; 1132 struct thread *td; 1133 struct vnode *vp; 1134 struct gzio_stream *gzs; 1135 }; 1136 1137 static void cb_put_phdr(vm_map_entry_t, void *); 1138 static void cb_size_segment(vm_map_entry_t, void *); 1139 static int core_write(struct coredump_params *, void *, size_t, off_t, 1140 enum uio_seg); 1141 static void each_writable_segment(struct thread *, segment_callback, void *); 1142 static int __elfN(corehdr)(struct coredump_params *, int, void *, size_t, 1143 struct note_info_list *, size_t); 1144 static void __elfN(prepare_notes)(struct thread *, struct note_info_list *, 1145 size_t *); 1146 static void __elfN(puthdr)(struct thread *, void *, size_t, int, size_t); 1147 static void __elfN(putnote)(struct note_info *, struct sbuf *); 1148 static size_t register_note(struct note_info_list *, int, outfunc_t, void *); 1149 static int sbuf_drain_core_output(void *, const char *, int); 1150 static int sbuf_drain_count(void *arg, const char *data, int len); 1151 1152 static void __elfN(note_fpregset)(void *, struct sbuf *, size_t *); 1153 static void __elfN(note_prpsinfo)(void *, struct sbuf *, size_t *); 1154 static void __elfN(note_prstatus)(void *, struct sbuf *, size_t *); 1155 static void __elfN(note_threadmd)(void *, struct sbuf *, size_t *); 1156 static void __elfN(note_thrmisc)(void *, struct sbuf *, size_t *); 1157 static void __elfN(note_procstat_auxv)(void *, struct sbuf *, size_t *); 1158 static void __elfN(note_procstat_proc)(void *, struct sbuf *, size_t *); 1159 static void __elfN(note_procstat_psstrings)(void *, struct sbuf *, size_t *); 1160 static void note_procstat_files(void *, struct sbuf *, size_t *); 1161 static void note_procstat_groups(void *, struct sbuf *, size_t *); 1162 static void note_procstat_osrel(void *, struct sbuf *, size_t *); 1163 static void note_procstat_rlimit(void *, struct sbuf *, size_t *); 1164 static void note_procstat_umask(void *, struct sbuf *, size_t *); 1165 static void note_procstat_vmmap(void *, struct sbuf *, size_t *); 1166 1167 #ifdef GZIO 1168 extern int compress_user_cores_gzlevel; 1169 1170 /* 1171 * Write out a core segment to the compression stream. 1172 */ 1173 static int 1174 compress_chunk(struct coredump_params *p, char *base, char *buf, u_int len) 1175 { 1176 u_int chunk_len; 1177 int error; 1178 1179 while (len > 0) { 1180 chunk_len = MIN(len, CORE_BUF_SIZE); 1181 copyin(base, buf, chunk_len); 1182 error = gzio_write(p->gzs, buf, chunk_len); 1183 if (error != 0) 1184 break; 1185 base += chunk_len; 1186 len -= chunk_len; 1187 } 1188 return (error); 1189 } 1190 1191 static int 1192 core_gz_write(void *base, size_t len, off_t offset, void *arg) 1193 { 1194 1195 return (core_write((struct coredump_params *)arg, base, len, offset, 1196 UIO_SYSSPACE)); 1197 } 1198 #endif /* GZIO */ 1199 1200 static int 1201 core_write(struct coredump_params *p, void *base, size_t len, off_t offset, 1202 enum uio_seg seg) 1203 { 1204 1205 return (vn_rdwr_inchunks(UIO_WRITE, p->vp, base, len, offset, 1206 seg, IO_UNIT | IO_DIRECT | IO_RANGELOCKED, 1207 p->active_cred, p->file_cred, NULL, p->td)); 1208 } 1209 1210 static int 1211 core_output(void *base, size_t len, off_t offset, struct coredump_params *p, 1212 void *tmpbuf) 1213 { 1214 1215 #ifdef GZIO 1216 if (p->gzs != NULL) 1217 return (compress_chunk(p, base, tmpbuf, len)); 1218 #endif 1219 return (core_write(p, base, len, offset, UIO_USERSPACE)); 1220 } 1221 1222 /* 1223 * Drain into a core file. 1224 */ 1225 static int 1226 sbuf_drain_core_output(void *arg, const char *data, int len) 1227 { 1228 struct coredump_params *p; 1229 int error, locked; 1230 1231 p = (struct coredump_params *)arg; 1232 1233 /* 1234 * Some kern_proc out routines that print to this sbuf may 1235 * call us with the process lock held. Draining with the 1236 * non-sleepable lock held is unsafe. The lock is needed for 1237 * those routines when dumping a live process. In our case we 1238 * can safely release the lock before draining and acquire 1239 * again after. 1240 */ 1241 locked = PROC_LOCKED(p->td->td_proc); 1242 if (locked) 1243 PROC_UNLOCK(p->td->td_proc); 1244 #ifdef GZIO 1245 if (p->gzs != NULL) 1246 error = gzio_write(p->gzs, __DECONST(char *, data), len); 1247 else 1248 #endif 1249 error = core_write(p, __DECONST(void *, data), len, p->offset, 1250 UIO_SYSSPACE); 1251 if (locked) 1252 PROC_LOCK(p->td->td_proc); 1253 if (error != 0) 1254 return (-error); 1255 p->offset += len; 1256 return (len); 1257 } 1258 1259 /* 1260 * Drain into a counter. 1261 */ 1262 static int 1263 sbuf_drain_count(void *arg, const char *data __unused, int len) 1264 { 1265 size_t *sizep; 1266 1267 sizep = (size_t *)arg; 1268 *sizep += len; 1269 return (len); 1270 } 1271 1272 int 1273 __elfN(coredump)(struct thread *td, struct vnode *vp, off_t limit, int flags) 1274 { 1275 struct ucred *cred = td->td_ucred; 1276 int error = 0; 1277 struct sseg_closure seginfo; 1278 struct note_info_list notelst; 1279 struct coredump_params params; 1280 struct note_info *ninfo; 1281 void *hdr, *tmpbuf; 1282 size_t hdrsize, notesz, coresize; 1283 #ifdef GZIO 1284 boolean_t compress; 1285 1286 compress = (flags & IMGACT_CORE_COMPRESS) != 0; 1287 #endif 1288 hdr = NULL; 1289 tmpbuf = NULL; 1290 TAILQ_INIT(¬elst); 1291 1292 /* Size the program segments. */ 1293 seginfo.count = 0; 1294 seginfo.size = 0; 1295 each_writable_segment(td, cb_size_segment, &seginfo); 1296 1297 /* 1298 * Collect info about the core file header area. 1299 */ 1300 hdrsize = sizeof(Elf_Ehdr) + sizeof(Elf_Phdr) * (1 + seginfo.count); 1301 __elfN(prepare_notes)(td, ¬elst, ¬esz); 1302 coresize = round_page(hdrsize + notesz) + seginfo.size; 1303 1304 /* Set up core dump parameters. */ 1305 params.offset = 0; 1306 params.active_cred = cred; 1307 params.file_cred = NOCRED; 1308 params.td = td; 1309 params.vp = vp; 1310 params.gzs = NULL; 1311 1312 #ifdef RACCT 1313 if (racct_enable) { 1314 PROC_LOCK(td->td_proc); 1315 error = racct_add(td->td_proc, RACCT_CORE, coresize); 1316 PROC_UNLOCK(td->td_proc); 1317 if (error != 0) { 1318 error = EFAULT; 1319 goto done; 1320 } 1321 } 1322 #endif 1323 if (coresize >= limit) { 1324 error = EFAULT; 1325 goto done; 1326 } 1327 1328 #ifdef GZIO 1329 /* Create a compression stream if necessary. */ 1330 if (compress) { 1331 params.gzs = gzio_init(core_gz_write, GZIO_DEFLATE, 1332 CORE_BUF_SIZE, compress_user_cores_gzlevel, ¶ms); 1333 if (params.gzs == NULL) { 1334 error = EFAULT; 1335 goto done; 1336 } 1337 tmpbuf = malloc(CORE_BUF_SIZE, M_TEMP, M_WAITOK | M_ZERO); 1338 } 1339 #endif 1340 1341 /* 1342 * Allocate memory for building the header, fill it up, 1343 * and write it out following the notes. 1344 */ 1345 hdr = malloc(hdrsize, M_TEMP, M_WAITOK); 1346 if (hdr == NULL) { 1347 error = EINVAL; 1348 goto done; 1349 } 1350 error = __elfN(corehdr)(¶ms, seginfo.count, hdr, hdrsize, ¬elst, 1351 notesz); 1352 1353 /* Write the contents of all of the writable segments. */ 1354 if (error == 0) { 1355 Elf_Phdr *php; 1356 off_t offset; 1357 int i; 1358 1359 php = (Elf_Phdr *)((char *)hdr + sizeof(Elf_Ehdr)) + 1; 1360 offset = round_page(hdrsize + notesz); 1361 for (i = 0; i < seginfo.count; i++) { 1362 error = core_output((caddr_t)(uintptr_t)php->p_vaddr, 1363 php->p_filesz, offset, ¶ms, tmpbuf); 1364 if (error != 0) 1365 break; 1366 offset += php->p_filesz; 1367 php++; 1368 } 1369 #ifdef GZIO 1370 if (error == 0 && compress) 1371 error = gzio_flush(params.gzs); 1372 #endif 1373 } 1374 if (error) { 1375 log(LOG_WARNING, 1376 "Failed to write core file for process %s (error %d)\n", 1377 curproc->p_comm, error); 1378 } 1379 1380 done: 1381 #ifdef GZIO 1382 if (compress) { 1383 free(tmpbuf, M_TEMP); 1384 if (params.gzs != NULL) 1385 gzio_fini(params.gzs); 1386 } 1387 #endif 1388 while ((ninfo = TAILQ_FIRST(¬elst)) != NULL) { 1389 TAILQ_REMOVE(¬elst, ninfo, link); 1390 free(ninfo, M_TEMP); 1391 } 1392 if (hdr != NULL) 1393 free(hdr, M_TEMP); 1394 1395 return (error); 1396 } 1397 1398 /* 1399 * A callback for each_writable_segment() to write out the segment's 1400 * program header entry. 1401 */ 1402 static void 1403 cb_put_phdr(entry, closure) 1404 vm_map_entry_t entry; 1405 void *closure; 1406 { 1407 struct phdr_closure *phc = (struct phdr_closure *)closure; 1408 Elf_Phdr *phdr = phc->phdr; 1409 1410 phc->offset = round_page(phc->offset); 1411 1412 phdr->p_type = PT_LOAD; 1413 phdr->p_offset = phc->offset; 1414 phdr->p_vaddr = entry->start; 1415 phdr->p_paddr = 0; 1416 phdr->p_filesz = phdr->p_memsz = entry->end - entry->start; 1417 phdr->p_align = PAGE_SIZE; 1418 phdr->p_flags = __elfN(untrans_prot)(entry->protection); 1419 1420 phc->offset += phdr->p_filesz; 1421 phc->phdr++; 1422 } 1423 1424 /* 1425 * A callback for each_writable_segment() to gather information about 1426 * the number of segments and their total size. 1427 */ 1428 static void 1429 cb_size_segment(entry, closure) 1430 vm_map_entry_t entry; 1431 void *closure; 1432 { 1433 struct sseg_closure *ssc = (struct sseg_closure *)closure; 1434 1435 ssc->count++; 1436 ssc->size += entry->end - entry->start; 1437 } 1438 1439 /* 1440 * For each writable segment in the process's memory map, call the given 1441 * function with a pointer to the map entry and some arbitrary 1442 * caller-supplied data. 1443 */ 1444 static void 1445 each_writable_segment(td, func, closure) 1446 struct thread *td; 1447 segment_callback func; 1448 void *closure; 1449 { 1450 struct proc *p = td->td_proc; 1451 vm_map_t map = &p->p_vmspace->vm_map; 1452 vm_map_entry_t entry; 1453 vm_object_t backing_object, object; 1454 boolean_t ignore_entry; 1455 1456 vm_map_lock_read(map); 1457 for (entry = map->header.next; entry != &map->header; 1458 entry = entry->next) { 1459 /* 1460 * Don't dump inaccessible mappings, deal with legacy 1461 * coredump mode. 1462 * 1463 * Note that read-only segments related to the elf binary 1464 * are marked MAP_ENTRY_NOCOREDUMP now so we no longer 1465 * need to arbitrarily ignore such segments. 1466 */ 1467 if (elf_legacy_coredump) { 1468 if ((entry->protection & VM_PROT_RW) != VM_PROT_RW) 1469 continue; 1470 } else { 1471 if ((entry->protection & VM_PROT_ALL) == 0) 1472 continue; 1473 } 1474 1475 /* 1476 * Dont include memory segment in the coredump if 1477 * MAP_NOCORE is set in mmap(2) or MADV_NOCORE in 1478 * madvise(2). Do not dump submaps (i.e. parts of the 1479 * kernel map). 1480 */ 1481 if (entry->eflags & (MAP_ENTRY_NOCOREDUMP|MAP_ENTRY_IS_SUB_MAP)) 1482 continue; 1483 1484 if ((object = entry->object.vm_object) == NULL) 1485 continue; 1486 1487 /* Ignore memory-mapped devices and such things. */ 1488 VM_OBJECT_RLOCK(object); 1489 while ((backing_object = object->backing_object) != NULL) { 1490 VM_OBJECT_RLOCK(backing_object); 1491 VM_OBJECT_RUNLOCK(object); 1492 object = backing_object; 1493 } 1494 ignore_entry = object->type != OBJT_DEFAULT && 1495 object->type != OBJT_SWAP && object->type != OBJT_VNODE && 1496 object->type != OBJT_PHYS; 1497 VM_OBJECT_RUNLOCK(object); 1498 if (ignore_entry) 1499 continue; 1500 1501 (*func)(entry, closure); 1502 } 1503 vm_map_unlock_read(map); 1504 } 1505 1506 /* 1507 * Write the core file header to the file, including padding up to 1508 * the page boundary. 1509 */ 1510 static int 1511 __elfN(corehdr)(struct coredump_params *p, int numsegs, void *hdr, 1512 size_t hdrsize, struct note_info_list *notelst, size_t notesz) 1513 { 1514 struct note_info *ninfo; 1515 struct sbuf *sb; 1516 int error; 1517 1518 /* Fill in the header. */ 1519 bzero(hdr, hdrsize); 1520 __elfN(puthdr)(p->td, hdr, hdrsize, numsegs, notesz); 1521 1522 sb = sbuf_new(NULL, NULL, CORE_BUF_SIZE, SBUF_FIXEDLEN); 1523 sbuf_set_drain(sb, sbuf_drain_core_output, p); 1524 sbuf_start_section(sb, NULL); 1525 sbuf_bcat(sb, hdr, hdrsize); 1526 TAILQ_FOREACH(ninfo, notelst, link) 1527 __elfN(putnote)(ninfo, sb); 1528 /* Align up to a page boundary for the program segments. */ 1529 sbuf_end_section(sb, -1, PAGE_SIZE, 0); 1530 error = sbuf_finish(sb); 1531 sbuf_delete(sb); 1532 1533 return (error); 1534 } 1535 1536 static void 1537 __elfN(prepare_notes)(struct thread *td, struct note_info_list *list, 1538 size_t *sizep) 1539 { 1540 struct proc *p; 1541 struct thread *thr; 1542 size_t size; 1543 1544 p = td->td_proc; 1545 size = 0; 1546 1547 size += register_note(list, NT_PRPSINFO, __elfN(note_prpsinfo), p); 1548 1549 /* 1550 * To have the debugger select the right thread (LWP) as the initial 1551 * thread, we dump the state of the thread passed to us in td first. 1552 * This is the thread that causes the core dump and thus likely to 1553 * be the right thread one wants to have selected in the debugger. 1554 */ 1555 thr = td; 1556 while (thr != NULL) { 1557 size += register_note(list, NT_PRSTATUS, 1558 __elfN(note_prstatus), thr); 1559 size += register_note(list, NT_FPREGSET, 1560 __elfN(note_fpregset), thr); 1561 size += register_note(list, NT_THRMISC, 1562 __elfN(note_thrmisc), thr); 1563 size += register_note(list, -1, 1564 __elfN(note_threadmd), thr); 1565 1566 thr = (thr == td) ? TAILQ_FIRST(&p->p_threads) : 1567 TAILQ_NEXT(thr, td_plist); 1568 if (thr == td) 1569 thr = TAILQ_NEXT(thr, td_plist); 1570 } 1571 1572 size += register_note(list, NT_PROCSTAT_PROC, 1573 __elfN(note_procstat_proc), p); 1574 size += register_note(list, NT_PROCSTAT_FILES, 1575 note_procstat_files, p); 1576 size += register_note(list, NT_PROCSTAT_VMMAP, 1577 note_procstat_vmmap, p); 1578 size += register_note(list, NT_PROCSTAT_GROUPS, 1579 note_procstat_groups, p); 1580 size += register_note(list, NT_PROCSTAT_UMASK, 1581 note_procstat_umask, p); 1582 size += register_note(list, NT_PROCSTAT_RLIMIT, 1583 note_procstat_rlimit, p); 1584 size += register_note(list, NT_PROCSTAT_OSREL, 1585 note_procstat_osrel, p); 1586 size += register_note(list, NT_PROCSTAT_PSSTRINGS, 1587 __elfN(note_procstat_psstrings), p); 1588 size += register_note(list, NT_PROCSTAT_AUXV, 1589 __elfN(note_procstat_auxv), p); 1590 1591 *sizep = size; 1592 } 1593 1594 static void 1595 __elfN(puthdr)(struct thread *td, void *hdr, size_t hdrsize, int numsegs, 1596 size_t notesz) 1597 { 1598 Elf_Ehdr *ehdr; 1599 Elf_Phdr *phdr; 1600 struct phdr_closure phc; 1601 1602 ehdr = (Elf_Ehdr *)hdr; 1603 phdr = (Elf_Phdr *)((char *)hdr + sizeof(Elf_Ehdr)); 1604 1605 ehdr->e_ident[EI_MAG0] = ELFMAG0; 1606 ehdr->e_ident[EI_MAG1] = ELFMAG1; 1607 ehdr->e_ident[EI_MAG2] = ELFMAG2; 1608 ehdr->e_ident[EI_MAG3] = ELFMAG3; 1609 ehdr->e_ident[EI_CLASS] = ELF_CLASS; 1610 ehdr->e_ident[EI_DATA] = ELF_DATA; 1611 ehdr->e_ident[EI_VERSION] = EV_CURRENT; 1612 ehdr->e_ident[EI_OSABI] = ELFOSABI_FREEBSD; 1613 ehdr->e_ident[EI_ABIVERSION] = 0; 1614 ehdr->e_ident[EI_PAD] = 0; 1615 ehdr->e_type = ET_CORE; 1616 #if defined(COMPAT_FREEBSD32) && __ELF_WORD_SIZE == 32 1617 ehdr->e_machine = ELF_ARCH32; 1618 #else 1619 ehdr->e_machine = ELF_ARCH; 1620 #endif 1621 ehdr->e_version = EV_CURRENT; 1622 ehdr->e_entry = 0; 1623 ehdr->e_phoff = sizeof(Elf_Ehdr); 1624 ehdr->e_flags = 0; 1625 ehdr->e_ehsize = sizeof(Elf_Ehdr); 1626 ehdr->e_phentsize = sizeof(Elf_Phdr); 1627 ehdr->e_phnum = numsegs + 1; 1628 ehdr->e_shentsize = sizeof(Elf_Shdr); 1629 ehdr->e_shnum = 0; 1630 ehdr->e_shstrndx = SHN_UNDEF; 1631 1632 /* 1633 * Fill in the program header entries. 1634 */ 1635 1636 /* The note segement. */ 1637 phdr->p_type = PT_NOTE; 1638 phdr->p_offset = hdrsize; 1639 phdr->p_vaddr = 0; 1640 phdr->p_paddr = 0; 1641 phdr->p_filesz = notesz; 1642 phdr->p_memsz = 0; 1643 phdr->p_flags = PF_R; 1644 phdr->p_align = ELF_NOTE_ROUNDSIZE; 1645 phdr++; 1646 1647 /* All the writable segments from the program. */ 1648 phc.phdr = phdr; 1649 phc.offset = round_page(hdrsize + notesz); 1650 each_writable_segment(td, cb_put_phdr, &phc); 1651 } 1652 1653 static size_t 1654 register_note(struct note_info_list *list, int type, outfunc_t out, void *arg) 1655 { 1656 struct note_info *ninfo; 1657 size_t size, notesize; 1658 1659 size = 0; 1660 out(arg, NULL, &size); 1661 ninfo = malloc(sizeof(*ninfo), M_TEMP, M_ZERO | M_WAITOK); 1662 ninfo->type = type; 1663 ninfo->outfunc = out; 1664 ninfo->outarg = arg; 1665 ninfo->outsize = size; 1666 TAILQ_INSERT_TAIL(list, ninfo, link); 1667 1668 if (type == -1) 1669 return (size); 1670 1671 notesize = sizeof(Elf_Note) + /* note header */ 1672 roundup2(sizeof(FREEBSD_ABI_VENDOR), ELF_NOTE_ROUNDSIZE) + 1673 /* note name */ 1674 roundup2(size, ELF_NOTE_ROUNDSIZE); /* note description */ 1675 1676 return (notesize); 1677 } 1678 1679 static size_t 1680 append_note_data(const void *src, void *dst, size_t len) 1681 { 1682 size_t padded_len; 1683 1684 padded_len = roundup2(len, ELF_NOTE_ROUNDSIZE); 1685 if (dst != NULL) { 1686 bcopy(src, dst, len); 1687 bzero((char *)dst + len, padded_len - len); 1688 } 1689 return (padded_len); 1690 } 1691 1692 size_t 1693 __elfN(populate_note)(int type, void *src, void *dst, size_t size, void **descp) 1694 { 1695 Elf_Note *note; 1696 char *buf; 1697 size_t notesize; 1698 1699 buf = dst; 1700 if (buf != NULL) { 1701 note = (Elf_Note *)buf; 1702 note->n_namesz = sizeof(FREEBSD_ABI_VENDOR); 1703 note->n_descsz = size; 1704 note->n_type = type; 1705 buf += sizeof(*note); 1706 buf += append_note_data(FREEBSD_ABI_VENDOR, buf, 1707 sizeof(FREEBSD_ABI_VENDOR)); 1708 append_note_data(src, buf, size); 1709 if (descp != NULL) 1710 *descp = buf; 1711 } 1712 1713 notesize = sizeof(Elf_Note) + /* note header */ 1714 roundup2(sizeof(FREEBSD_ABI_VENDOR), ELF_NOTE_ROUNDSIZE) + 1715 /* note name */ 1716 roundup2(size, ELF_NOTE_ROUNDSIZE); /* note description */ 1717 1718 return (notesize); 1719 } 1720 1721 static void 1722 __elfN(putnote)(struct note_info *ninfo, struct sbuf *sb) 1723 { 1724 Elf_Note note; 1725 ssize_t old_len, sect_len; 1726 size_t new_len, descsz, i; 1727 1728 if (ninfo->type == -1) { 1729 ninfo->outfunc(ninfo->outarg, sb, &ninfo->outsize); 1730 return; 1731 } 1732 1733 note.n_namesz = sizeof(FREEBSD_ABI_VENDOR); 1734 note.n_descsz = ninfo->outsize; 1735 note.n_type = ninfo->type; 1736 1737 sbuf_bcat(sb, ¬e, sizeof(note)); 1738 sbuf_start_section(sb, &old_len); 1739 sbuf_bcat(sb, FREEBSD_ABI_VENDOR, sizeof(FREEBSD_ABI_VENDOR)); 1740 sbuf_end_section(sb, old_len, ELF_NOTE_ROUNDSIZE, 0); 1741 if (note.n_descsz == 0) 1742 return; 1743 sbuf_start_section(sb, &old_len); 1744 ninfo->outfunc(ninfo->outarg, sb, &ninfo->outsize); 1745 sect_len = sbuf_end_section(sb, old_len, ELF_NOTE_ROUNDSIZE, 0); 1746 if (sect_len < 0) 1747 return; 1748 1749 new_len = (size_t)sect_len; 1750 descsz = roundup(note.n_descsz, ELF_NOTE_ROUNDSIZE); 1751 if (new_len < descsz) { 1752 /* 1753 * It is expected that individual note emitters will correctly 1754 * predict their expected output size and fill up to that size 1755 * themselves, padding in a format-specific way if needed. 1756 * However, in case they don't, just do it here with zeros. 1757 */ 1758 for (i = 0; i < descsz - new_len; i++) 1759 sbuf_putc(sb, 0); 1760 } else if (new_len > descsz) { 1761 /* 1762 * We can't always truncate sb -- we may have drained some 1763 * of it already. 1764 */ 1765 KASSERT(new_len == descsz, ("%s: Note type %u changed as we " 1766 "read it (%zu > %zu). Since it is longer than " 1767 "expected, this coredump's notes are corrupt. THIS " 1768 "IS A BUG in the note_procstat routine for type %u.\n", 1769 __func__, (unsigned)note.n_type, new_len, descsz, 1770 (unsigned)note.n_type)); 1771 } 1772 } 1773 1774 /* 1775 * Miscellaneous note out functions. 1776 */ 1777 1778 #if defined(COMPAT_FREEBSD32) && __ELF_WORD_SIZE == 32 1779 #include <compat/freebsd32/freebsd32.h> 1780 1781 typedef struct prstatus32 elf_prstatus_t; 1782 typedef struct prpsinfo32 elf_prpsinfo_t; 1783 typedef struct fpreg32 elf_prfpregset_t; 1784 typedef struct fpreg32 elf_fpregset_t; 1785 typedef struct reg32 elf_gregset_t; 1786 typedef struct thrmisc32 elf_thrmisc_t; 1787 #define ELF_KERN_PROC_MASK KERN_PROC_MASK32 1788 typedef struct kinfo_proc32 elf_kinfo_proc_t; 1789 typedef uint32_t elf_ps_strings_t; 1790 #else 1791 typedef prstatus_t elf_prstatus_t; 1792 typedef prpsinfo_t elf_prpsinfo_t; 1793 typedef prfpregset_t elf_prfpregset_t; 1794 typedef prfpregset_t elf_fpregset_t; 1795 typedef gregset_t elf_gregset_t; 1796 typedef thrmisc_t elf_thrmisc_t; 1797 #define ELF_KERN_PROC_MASK 0 1798 typedef struct kinfo_proc elf_kinfo_proc_t; 1799 typedef vm_offset_t elf_ps_strings_t; 1800 #endif 1801 1802 static void 1803 __elfN(note_prpsinfo)(void *arg, struct sbuf *sb, size_t *sizep) 1804 { 1805 struct proc *p; 1806 elf_prpsinfo_t *psinfo; 1807 1808 p = (struct proc *)arg; 1809 if (sb != NULL) { 1810 KASSERT(*sizep == sizeof(*psinfo), ("invalid size")); 1811 psinfo = malloc(sizeof(*psinfo), M_TEMP, M_ZERO | M_WAITOK); 1812 psinfo->pr_version = PRPSINFO_VERSION; 1813 psinfo->pr_psinfosz = sizeof(elf_prpsinfo_t); 1814 strlcpy(psinfo->pr_fname, p->p_comm, sizeof(psinfo->pr_fname)); 1815 /* 1816 * XXX - We don't fill in the command line arguments properly 1817 * yet. 1818 */ 1819 strlcpy(psinfo->pr_psargs, p->p_comm, 1820 sizeof(psinfo->pr_psargs)); 1821 1822 sbuf_bcat(sb, psinfo, sizeof(*psinfo)); 1823 free(psinfo, M_TEMP); 1824 } 1825 *sizep = sizeof(*psinfo); 1826 } 1827 1828 static void 1829 __elfN(note_prstatus)(void *arg, struct sbuf *sb, size_t *sizep) 1830 { 1831 struct thread *td; 1832 elf_prstatus_t *status; 1833 1834 td = (struct thread *)arg; 1835 if (sb != NULL) { 1836 KASSERT(*sizep == sizeof(*status), ("invalid size")); 1837 status = malloc(sizeof(*status), M_TEMP, M_ZERO | M_WAITOK); 1838 status->pr_version = PRSTATUS_VERSION; 1839 status->pr_statussz = sizeof(elf_prstatus_t); 1840 status->pr_gregsetsz = sizeof(elf_gregset_t); 1841 status->pr_fpregsetsz = sizeof(elf_fpregset_t); 1842 status->pr_osreldate = osreldate; 1843 status->pr_cursig = td->td_proc->p_sig; 1844 status->pr_pid = td->td_tid; 1845 #if defined(COMPAT_FREEBSD32) && __ELF_WORD_SIZE == 32 1846 fill_regs32(td, &status->pr_reg); 1847 #else 1848 fill_regs(td, &status->pr_reg); 1849 #endif 1850 sbuf_bcat(sb, status, sizeof(*status)); 1851 free(status, M_TEMP); 1852 } 1853 *sizep = sizeof(*status); 1854 } 1855 1856 static void 1857 __elfN(note_fpregset)(void *arg, struct sbuf *sb, size_t *sizep) 1858 { 1859 struct thread *td; 1860 elf_prfpregset_t *fpregset; 1861 1862 td = (struct thread *)arg; 1863 if (sb != NULL) { 1864 KASSERT(*sizep == sizeof(*fpregset), ("invalid size")); 1865 fpregset = malloc(sizeof(*fpregset), M_TEMP, M_ZERO | M_WAITOK); 1866 #if defined(COMPAT_FREEBSD32) && __ELF_WORD_SIZE == 32 1867 fill_fpregs32(td, fpregset); 1868 #else 1869 fill_fpregs(td, fpregset); 1870 #endif 1871 sbuf_bcat(sb, fpregset, sizeof(*fpregset)); 1872 free(fpregset, M_TEMP); 1873 } 1874 *sizep = sizeof(*fpregset); 1875 } 1876 1877 static void 1878 __elfN(note_thrmisc)(void *arg, struct sbuf *sb, size_t *sizep) 1879 { 1880 struct thread *td; 1881 elf_thrmisc_t thrmisc; 1882 1883 td = (struct thread *)arg; 1884 if (sb != NULL) { 1885 KASSERT(*sizep == sizeof(thrmisc), ("invalid size")); 1886 bzero(&thrmisc._pad, sizeof(thrmisc._pad)); 1887 strcpy(thrmisc.pr_tname, td->td_name); 1888 sbuf_bcat(sb, &thrmisc, sizeof(thrmisc)); 1889 } 1890 *sizep = sizeof(thrmisc); 1891 } 1892 1893 /* 1894 * Allow for MD specific notes, as well as any MD 1895 * specific preparations for writing MI notes. 1896 */ 1897 static void 1898 __elfN(note_threadmd)(void *arg, struct sbuf *sb, size_t *sizep) 1899 { 1900 struct thread *td; 1901 void *buf; 1902 size_t size; 1903 1904 td = (struct thread *)arg; 1905 size = *sizep; 1906 if (size != 0 && sb != NULL) 1907 buf = malloc(size, M_TEMP, M_ZERO | M_WAITOK); 1908 else 1909 buf = NULL; 1910 size = 0; 1911 __elfN(dump_thread)(td, buf, &size); 1912 KASSERT(sb == NULL || *sizep == size, ("invalid size")); 1913 if (size != 0 && sb != NULL) 1914 sbuf_bcat(sb, buf, size); 1915 free(buf, M_TEMP); 1916 *sizep = size; 1917 } 1918 1919 #ifdef KINFO_PROC_SIZE 1920 CTASSERT(sizeof(struct kinfo_proc) == KINFO_PROC_SIZE); 1921 #endif 1922 1923 static void 1924 __elfN(note_procstat_proc)(void *arg, struct sbuf *sb, size_t *sizep) 1925 { 1926 struct proc *p; 1927 size_t size; 1928 int structsize; 1929 1930 p = (struct proc *)arg; 1931 size = sizeof(structsize) + p->p_numthreads * 1932 sizeof(elf_kinfo_proc_t); 1933 1934 if (sb != NULL) { 1935 KASSERT(*sizep == size, ("invalid size")); 1936 structsize = sizeof(elf_kinfo_proc_t); 1937 sbuf_bcat(sb, &structsize, sizeof(structsize)); 1938 sx_slock(&proctree_lock); 1939 PROC_LOCK(p); 1940 kern_proc_out(p, sb, ELF_KERN_PROC_MASK); 1941 sx_sunlock(&proctree_lock); 1942 } 1943 *sizep = size; 1944 } 1945 1946 #ifdef KINFO_FILE_SIZE 1947 CTASSERT(sizeof(struct kinfo_file) == KINFO_FILE_SIZE); 1948 #endif 1949 1950 static void 1951 note_procstat_files(void *arg, struct sbuf *sb, size_t *sizep) 1952 { 1953 struct proc *p; 1954 size_t size, sect_sz, i; 1955 ssize_t start_len, sect_len; 1956 int structsize, filedesc_flags; 1957 1958 if (coredump_pack_fileinfo) 1959 filedesc_flags = KERN_FILEDESC_PACK_KINFO; 1960 else 1961 filedesc_flags = 0; 1962 1963 p = (struct proc *)arg; 1964 structsize = sizeof(struct kinfo_file); 1965 if (sb == NULL) { 1966 size = 0; 1967 sb = sbuf_new(NULL, NULL, 128, SBUF_FIXEDLEN); 1968 sbuf_set_drain(sb, sbuf_drain_count, &size); 1969 sbuf_bcat(sb, &structsize, sizeof(structsize)); 1970 PROC_LOCK(p); 1971 kern_proc_filedesc_out(p, sb, -1, filedesc_flags); 1972 sbuf_finish(sb); 1973 sbuf_delete(sb); 1974 *sizep = size; 1975 } else { 1976 sbuf_start_section(sb, &start_len); 1977 1978 sbuf_bcat(sb, &structsize, sizeof(structsize)); 1979 PROC_LOCK(p); 1980 kern_proc_filedesc_out(p, sb, *sizep - sizeof(structsize), 1981 filedesc_flags); 1982 1983 sect_len = sbuf_end_section(sb, start_len, 0, 0); 1984 if (sect_len < 0) 1985 return; 1986 sect_sz = sect_len; 1987 1988 KASSERT(sect_sz <= *sizep, 1989 ("kern_proc_filedesc_out did not respect maxlen; " 1990 "requested %zu, got %zu", *sizep - sizeof(structsize), 1991 sect_sz - sizeof(structsize))); 1992 1993 for (i = 0; i < *sizep - sect_sz && sb->s_error == 0; i++) 1994 sbuf_putc(sb, 0); 1995 } 1996 } 1997 1998 #ifdef KINFO_VMENTRY_SIZE 1999 CTASSERT(sizeof(struct kinfo_vmentry) == KINFO_VMENTRY_SIZE); 2000 #endif 2001 2002 static void 2003 note_procstat_vmmap(void *arg, struct sbuf *sb, size_t *sizep) 2004 { 2005 struct proc *p; 2006 size_t size; 2007 int structsize, vmmap_flags; 2008 2009 if (coredump_pack_vmmapinfo) 2010 vmmap_flags = KERN_VMMAP_PACK_KINFO; 2011 else 2012 vmmap_flags = 0; 2013 2014 p = (struct proc *)arg; 2015 structsize = sizeof(struct kinfo_vmentry); 2016 if (sb == NULL) { 2017 size = 0; 2018 sb = sbuf_new(NULL, NULL, 128, SBUF_FIXEDLEN); 2019 sbuf_set_drain(sb, sbuf_drain_count, &size); 2020 sbuf_bcat(sb, &structsize, sizeof(structsize)); 2021 PROC_LOCK(p); 2022 kern_proc_vmmap_out(p, sb, -1, vmmap_flags); 2023 sbuf_finish(sb); 2024 sbuf_delete(sb); 2025 *sizep = size; 2026 } else { 2027 sbuf_bcat(sb, &structsize, sizeof(structsize)); 2028 PROC_LOCK(p); 2029 kern_proc_vmmap_out(p, sb, *sizep - sizeof(structsize), 2030 vmmap_flags); 2031 } 2032 } 2033 2034 static void 2035 note_procstat_groups(void *arg, struct sbuf *sb, size_t *sizep) 2036 { 2037 struct proc *p; 2038 size_t size; 2039 int structsize; 2040 2041 p = (struct proc *)arg; 2042 size = sizeof(structsize) + p->p_ucred->cr_ngroups * sizeof(gid_t); 2043 if (sb != NULL) { 2044 KASSERT(*sizep == size, ("invalid size")); 2045 structsize = sizeof(gid_t); 2046 sbuf_bcat(sb, &structsize, sizeof(structsize)); 2047 sbuf_bcat(sb, p->p_ucred->cr_groups, p->p_ucred->cr_ngroups * 2048 sizeof(gid_t)); 2049 } 2050 *sizep = size; 2051 } 2052 2053 static void 2054 note_procstat_umask(void *arg, struct sbuf *sb, size_t *sizep) 2055 { 2056 struct proc *p; 2057 size_t size; 2058 int structsize; 2059 2060 p = (struct proc *)arg; 2061 size = sizeof(structsize) + sizeof(p->p_fd->fd_cmask); 2062 if (sb != NULL) { 2063 KASSERT(*sizep == size, ("invalid size")); 2064 structsize = sizeof(p->p_fd->fd_cmask); 2065 sbuf_bcat(sb, &structsize, sizeof(structsize)); 2066 sbuf_bcat(sb, &p->p_fd->fd_cmask, sizeof(p->p_fd->fd_cmask)); 2067 } 2068 *sizep = size; 2069 } 2070 2071 static void 2072 note_procstat_rlimit(void *arg, struct sbuf *sb, size_t *sizep) 2073 { 2074 struct proc *p; 2075 struct rlimit rlim[RLIM_NLIMITS]; 2076 size_t size; 2077 int structsize, i; 2078 2079 p = (struct proc *)arg; 2080 size = sizeof(structsize) + sizeof(rlim); 2081 if (sb != NULL) { 2082 KASSERT(*sizep == size, ("invalid size")); 2083 structsize = sizeof(rlim); 2084 sbuf_bcat(sb, &structsize, sizeof(structsize)); 2085 PROC_LOCK(p); 2086 for (i = 0; i < RLIM_NLIMITS; i++) 2087 lim_rlimit_proc(p, i, &rlim[i]); 2088 PROC_UNLOCK(p); 2089 sbuf_bcat(sb, rlim, sizeof(rlim)); 2090 } 2091 *sizep = size; 2092 } 2093 2094 static void 2095 note_procstat_osrel(void *arg, struct sbuf *sb, size_t *sizep) 2096 { 2097 struct proc *p; 2098 size_t size; 2099 int structsize; 2100 2101 p = (struct proc *)arg; 2102 size = sizeof(structsize) + sizeof(p->p_osrel); 2103 if (sb != NULL) { 2104 KASSERT(*sizep == size, ("invalid size")); 2105 structsize = sizeof(p->p_osrel); 2106 sbuf_bcat(sb, &structsize, sizeof(structsize)); 2107 sbuf_bcat(sb, &p->p_osrel, sizeof(p->p_osrel)); 2108 } 2109 *sizep = size; 2110 } 2111 2112 static void 2113 __elfN(note_procstat_psstrings)(void *arg, struct sbuf *sb, size_t *sizep) 2114 { 2115 struct proc *p; 2116 elf_ps_strings_t ps_strings; 2117 size_t size; 2118 int structsize; 2119 2120 p = (struct proc *)arg; 2121 size = sizeof(structsize) + sizeof(ps_strings); 2122 if (sb != NULL) { 2123 KASSERT(*sizep == size, ("invalid size")); 2124 structsize = sizeof(ps_strings); 2125 #if defined(COMPAT_FREEBSD32) && __ELF_WORD_SIZE == 32 2126 ps_strings = PTROUT(p->p_sysent->sv_psstrings); 2127 #else 2128 ps_strings = p->p_sysent->sv_psstrings; 2129 #endif 2130 sbuf_bcat(sb, &structsize, sizeof(structsize)); 2131 sbuf_bcat(sb, &ps_strings, sizeof(ps_strings)); 2132 } 2133 *sizep = size; 2134 } 2135 2136 static void 2137 __elfN(note_procstat_auxv)(void *arg, struct sbuf *sb, size_t *sizep) 2138 { 2139 struct proc *p; 2140 size_t size; 2141 int structsize; 2142 2143 p = (struct proc *)arg; 2144 if (sb == NULL) { 2145 size = 0; 2146 sb = sbuf_new(NULL, NULL, 128, SBUF_FIXEDLEN); 2147 sbuf_set_drain(sb, sbuf_drain_count, &size); 2148 sbuf_bcat(sb, &structsize, sizeof(structsize)); 2149 PHOLD(p); 2150 proc_getauxv(curthread, p, sb); 2151 PRELE(p); 2152 sbuf_finish(sb); 2153 sbuf_delete(sb); 2154 *sizep = size; 2155 } else { 2156 structsize = sizeof(Elf_Auxinfo); 2157 sbuf_bcat(sb, &structsize, sizeof(structsize)); 2158 PHOLD(p); 2159 proc_getauxv(curthread, p, sb); 2160 PRELE(p); 2161 } 2162 } 2163 2164 static boolean_t 2165 __elfN(parse_notes)(struct image_params *imgp, Elf_Brandnote *checknote, 2166 int32_t *osrel, const Elf_Phdr *pnote) 2167 { 2168 const Elf_Note *note, *note0, *note_end; 2169 const char *note_name; 2170 char *buf; 2171 int i, error; 2172 boolean_t res; 2173 2174 /* We need some limit, might as well use PAGE_SIZE. */ 2175 if (pnote == NULL || pnote->p_filesz > PAGE_SIZE) 2176 return (FALSE); 2177 ASSERT_VOP_LOCKED(imgp->vp, "parse_notes"); 2178 if (pnote->p_offset > PAGE_SIZE || 2179 pnote->p_filesz > PAGE_SIZE - pnote->p_offset) { 2180 VOP_UNLOCK(imgp->vp, 0); 2181 buf = malloc(pnote->p_filesz, M_TEMP, M_WAITOK); 2182 vn_lock(imgp->vp, LK_EXCLUSIVE | LK_RETRY); 2183 error = vn_rdwr(UIO_READ, imgp->vp, buf, pnote->p_filesz, 2184 pnote->p_offset, UIO_SYSSPACE, IO_NODELOCKED, 2185 curthread->td_ucred, NOCRED, NULL, curthread); 2186 if (error != 0) { 2187 uprintf("i/o error PT_NOTE\n"); 2188 res = FALSE; 2189 goto ret; 2190 } 2191 note = note0 = (const Elf_Note *)buf; 2192 note_end = (const Elf_Note *)(buf + pnote->p_filesz); 2193 } else { 2194 note = note0 = (const Elf_Note *)(imgp->image_header + 2195 pnote->p_offset); 2196 note_end = (const Elf_Note *)(imgp->image_header + 2197 pnote->p_offset + pnote->p_filesz); 2198 buf = NULL; 2199 } 2200 for (i = 0; i < 100 && note >= note0 && note < note_end; i++) { 2201 if (!aligned(note, Elf32_Addr) || (const char *)note_end - 2202 (const char *)note < sizeof(Elf_Note)) { 2203 res = FALSE; 2204 goto ret; 2205 } 2206 if (note->n_namesz != checknote->hdr.n_namesz || 2207 note->n_descsz != checknote->hdr.n_descsz || 2208 note->n_type != checknote->hdr.n_type) 2209 goto nextnote; 2210 note_name = (const char *)(note + 1); 2211 if (note_name + checknote->hdr.n_namesz >= 2212 (const char *)note_end || strncmp(checknote->vendor, 2213 note_name, checknote->hdr.n_namesz) != 0) 2214 goto nextnote; 2215 2216 /* 2217 * Fetch the osreldate for binary 2218 * from the ELF OSABI-note if necessary. 2219 */ 2220 if ((checknote->flags & BN_TRANSLATE_OSREL) != 0 && 2221 checknote->trans_osrel != NULL) { 2222 res = checknote->trans_osrel(note, osrel); 2223 goto ret; 2224 } 2225 res = TRUE; 2226 goto ret; 2227 nextnote: 2228 note = (const Elf_Note *)((const char *)(note + 1) + 2229 roundup2(note->n_namesz, ELF_NOTE_ROUNDSIZE) + 2230 roundup2(note->n_descsz, ELF_NOTE_ROUNDSIZE)); 2231 } 2232 res = FALSE; 2233 ret: 2234 free(buf, M_TEMP); 2235 return (res); 2236 } 2237 2238 /* 2239 * Try to find the appropriate ABI-note section for checknote, 2240 * fetch the osreldate for binary from the ELF OSABI-note. Only the 2241 * first page of the image is searched, the same as for headers. 2242 */ 2243 static boolean_t 2244 __elfN(check_note)(struct image_params *imgp, Elf_Brandnote *checknote, 2245 int32_t *osrel) 2246 { 2247 const Elf_Phdr *phdr; 2248 const Elf_Ehdr *hdr; 2249 int i; 2250 2251 hdr = (const Elf_Ehdr *)imgp->image_header; 2252 phdr = (const Elf_Phdr *)(imgp->image_header + hdr->e_phoff); 2253 2254 for (i = 0; i < hdr->e_phnum; i++) { 2255 if (phdr[i].p_type == PT_NOTE && 2256 __elfN(parse_notes)(imgp, checknote, osrel, &phdr[i])) 2257 return (TRUE); 2258 } 2259 return (FALSE); 2260 2261 } 2262 2263 /* 2264 * Tell kern_execve.c about it, with a little help from the linker. 2265 */ 2266 static struct execsw __elfN(execsw) = { 2267 __CONCAT(exec_, __elfN(imgact)), 2268 __XSTRING(__CONCAT(ELF, __ELF_WORD_SIZE)) 2269 }; 2270 EXEC_SET(__CONCAT(elf, __ELF_WORD_SIZE), __elfN(execsw)); 2271 2272 static vm_prot_t 2273 __elfN(trans_prot)(Elf_Word flags) 2274 { 2275 vm_prot_t prot; 2276 2277 prot = 0; 2278 if (flags & PF_X) 2279 prot |= VM_PROT_EXECUTE; 2280 if (flags & PF_W) 2281 prot |= VM_PROT_WRITE; 2282 if (flags & PF_R) 2283 prot |= VM_PROT_READ; 2284 #if __ELF_WORD_SIZE == 32 2285 #if defined(__amd64__) 2286 if (i386_read_exec && (flags & PF_R)) 2287 prot |= VM_PROT_EXECUTE; 2288 #endif 2289 #endif 2290 return (prot); 2291 } 2292 2293 static Elf_Word 2294 __elfN(untrans_prot)(vm_prot_t prot) 2295 { 2296 Elf_Word flags; 2297 2298 flags = 0; 2299 if (prot & VM_PROT_EXECUTE) 2300 flags |= PF_X; 2301 if (prot & VM_PROT_READ) 2302 flags |= PF_R; 2303 if (prot & VM_PROT_WRITE) 2304 flags |= PF_W; 2305 return (flags); 2306 } 2307