1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 2017 Dell EMC 5 * Copyright (c) 2000 David O'Brien 6 * Copyright (c) 1995-1996 Søren Schmidt 7 * Copyright (c) 1996 Peter Wemm 8 * All rights reserved. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer 15 * in this position and unchanged. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 3. The name of the author may not be used to endorse or promote products 20 * derived from this software without specific prior written permission 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 23 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 24 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 25 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 26 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 27 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 28 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 29 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 30 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 31 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 32 */ 33 34 #include <sys/cdefs.h> 35 __FBSDID("$FreeBSD$"); 36 37 #include "opt_capsicum.h" 38 39 #include <sys/param.h> 40 #include <sys/capsicum.h> 41 #include <sys/compressor.h> 42 #include <sys/exec.h> 43 #include <sys/fcntl.h> 44 #include <sys/imgact.h> 45 #include <sys/imgact_elf.h> 46 #include <sys/jail.h> 47 #include <sys/kernel.h> 48 #include <sys/lock.h> 49 #include <sys/malloc.h> 50 #include <sys/mount.h> 51 #include <sys/mman.h> 52 #include <sys/namei.h> 53 #include <sys/pioctl.h> 54 #include <sys/proc.h> 55 #include <sys/procfs.h> 56 #include <sys/ptrace.h> 57 #include <sys/racct.h> 58 #include <sys/resourcevar.h> 59 #include <sys/rwlock.h> 60 #include <sys/sbuf.h> 61 #include <sys/sf_buf.h> 62 #include <sys/smp.h> 63 #include <sys/systm.h> 64 #include <sys/signalvar.h> 65 #include <sys/stat.h> 66 #include <sys/sx.h> 67 #include <sys/syscall.h> 68 #include <sys/sysctl.h> 69 #include <sys/sysent.h> 70 #include <sys/vnode.h> 71 #include <sys/syslog.h> 72 #include <sys/eventhandler.h> 73 #include <sys/user.h> 74 75 #include <vm/vm.h> 76 #include <vm/vm_kern.h> 77 #include <vm/vm_param.h> 78 #include <vm/pmap.h> 79 #include <vm/vm_map.h> 80 #include <vm/vm_object.h> 81 #include <vm/vm_extern.h> 82 83 #include <machine/elf.h> 84 #include <machine/md_var.h> 85 86 #define ELF_NOTE_ROUNDSIZE 4 87 #define OLD_EI_BRAND 8 88 89 static int __elfN(check_header)(const Elf_Ehdr *hdr); 90 static Elf_Brandinfo *__elfN(get_brandinfo)(struct image_params *imgp, 91 const char *interp, int interp_name_len, int32_t *osrel); 92 static int __elfN(load_file)(struct proc *p, const char *file, u_long *addr, 93 u_long *entry, size_t pagesize); 94 static int __elfN(load_section)(struct image_params *imgp, vm_ooffset_t offset, 95 caddr_t vmaddr, size_t memsz, size_t filsz, vm_prot_t prot, 96 size_t pagesize); 97 static int __CONCAT(exec_, __elfN(imgact))(struct image_params *imgp); 98 static bool __elfN(freebsd_trans_osrel)(const Elf_Note *note, 99 int32_t *osrel); 100 static bool kfreebsd_trans_osrel(const Elf_Note *note, int32_t *osrel); 101 static boolean_t __elfN(check_note)(struct image_params *imgp, 102 Elf_Brandnote *checknote, int32_t *osrel); 103 static vm_prot_t __elfN(trans_prot)(Elf_Word); 104 static Elf_Word __elfN(untrans_prot)(vm_prot_t); 105 106 SYSCTL_NODE(_kern, OID_AUTO, __CONCAT(elf, __ELF_WORD_SIZE), CTLFLAG_RW, 0, 107 ""); 108 109 #define CORE_BUF_SIZE (16 * 1024) 110 111 int __elfN(fallback_brand) = -1; 112 SYSCTL_INT(__CONCAT(_kern_elf, __ELF_WORD_SIZE), OID_AUTO, 113 fallback_brand, CTLFLAG_RWTUN, &__elfN(fallback_brand), 0, 114 __XSTRING(__CONCAT(ELF, __ELF_WORD_SIZE)) " brand of last resort"); 115 116 static int elf_legacy_coredump = 0; 117 SYSCTL_INT(_debug, OID_AUTO, __elfN(legacy_coredump), CTLFLAG_RW, 118 &elf_legacy_coredump, 0, 119 "include all and only RW pages in core dumps"); 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) rounddown2(va, ps) 143 #define round_page_ps(va, ps) roundup2(va, ps) 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 bool 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 bool 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, *bi_m; 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 bi_m = NULL; 274 for (i = 0; i < MAX_BRANDS; i++) { 275 bi = elf_brand_list[i]; 276 if (bi == NULL) 277 continue; 278 if (interp != NULL && (bi->flags & BI_BRAND_ONLY_STATIC) != 0) 279 continue; 280 if (hdr->e_machine == bi->machine && (bi->flags & 281 (BI_BRAND_NOTE|BI_BRAND_NOTE_MANDATORY)) != 0) { 282 ret = __elfN(check_note)(imgp, bi->brand_note, osrel); 283 /* Give brand a chance to veto check_note's guess */ 284 if (ret && bi->header_supported) 285 ret = bi->header_supported(imgp); 286 /* 287 * If note checker claimed the binary, but the 288 * interpreter path in the image does not 289 * match default one for the brand, try to 290 * search for other brands with the same 291 * interpreter. Either there is better brand 292 * with the right interpreter, or, failing 293 * this, we return first brand which accepted 294 * our note and, optionally, header. 295 */ 296 if (ret && bi_m == NULL && interp != NULL && 297 (bi->interp_path == NULL || 298 (strlen(bi->interp_path) + 1 != interp_name_len || 299 strncmp(interp, bi->interp_path, interp_name_len) 300 != 0))) { 301 bi_m = bi; 302 ret = 0; 303 } 304 if (ret) 305 return (bi); 306 } 307 } 308 if (bi_m != NULL) 309 return (bi_m); 310 311 /* If the executable has a brand, search for it in the brand list. */ 312 for (i = 0; i < MAX_BRANDS; i++) { 313 bi = elf_brand_list[i]; 314 if (bi == NULL || (bi->flags & BI_BRAND_NOTE_MANDATORY) != 0 || 315 (interp != NULL && (bi->flags & BI_BRAND_ONLY_STATIC) != 0)) 316 continue; 317 if (hdr->e_machine == bi->machine && 318 (hdr->e_ident[EI_OSABI] == bi->brand || 319 (bi->compat_3_brand != NULL && 320 strcmp((const char *)&hdr->e_ident[OLD_EI_BRAND], 321 bi->compat_3_brand) == 0))) { 322 /* Looks good, but give brand a chance to veto */ 323 if (bi->header_supported == NULL || 324 bi->header_supported(imgp)) { 325 /* 326 * Again, prefer strictly matching 327 * interpreter path. 328 */ 329 if (interp_name_len == 0 && 330 bi->interp_path == NULL) 331 return (bi); 332 if (bi->interp_path != NULL && 333 strlen(bi->interp_path) + 1 == 334 interp_name_len && strncmp(interp, 335 bi->interp_path, interp_name_len) == 0) 336 return (bi); 337 if (bi_m == NULL) 338 bi_m = bi; 339 } 340 } 341 } 342 if (bi_m != NULL) 343 return (bi_m); 344 345 /* No known brand, see if the header is recognized by any brand */ 346 for (i = 0; i < MAX_BRANDS; i++) { 347 bi = elf_brand_list[i]; 348 if (bi == NULL || bi->flags & BI_BRAND_NOTE_MANDATORY || 349 bi->header_supported == NULL) 350 continue; 351 if (hdr->e_machine == bi->machine) { 352 ret = bi->header_supported(imgp); 353 if (ret) 354 return (bi); 355 } 356 } 357 358 /* Lacking a known brand, search for a recognized interpreter. */ 359 if (interp != NULL) { 360 for (i = 0; i < MAX_BRANDS; i++) { 361 bi = elf_brand_list[i]; 362 if (bi == NULL || (bi->flags & 363 (BI_BRAND_NOTE_MANDATORY | BI_BRAND_ONLY_STATIC)) 364 != 0) 365 continue; 366 if (hdr->e_machine == bi->machine && 367 bi->interp_path != NULL && 368 /* ELF image p_filesz includes terminating zero */ 369 strlen(bi->interp_path) + 1 == interp_name_len && 370 strncmp(interp, bi->interp_path, interp_name_len) 371 == 0 && (bi->header_supported == NULL || 372 bi->header_supported(imgp))) 373 return (bi); 374 } 375 } 376 377 /* Lacking a recognized interpreter, try the default brand */ 378 for (i = 0; i < MAX_BRANDS; i++) { 379 bi = elf_brand_list[i]; 380 if (bi == NULL || (bi->flags & BI_BRAND_NOTE_MANDATORY) != 0 || 381 (interp != NULL && (bi->flags & BI_BRAND_ONLY_STATIC) != 0)) 382 continue; 383 if (hdr->e_machine == bi->machine && 384 __elfN(fallback_brand) == bi->brand && 385 (bi->header_supported == NULL || 386 bi->header_supported(imgp))) 387 return (bi); 388 } 389 return (NULL); 390 } 391 392 static int 393 __elfN(check_header)(const Elf_Ehdr *hdr) 394 { 395 Elf_Brandinfo *bi; 396 int i; 397 398 if (!IS_ELF(*hdr) || 399 hdr->e_ident[EI_CLASS] != ELF_TARG_CLASS || 400 hdr->e_ident[EI_DATA] != ELF_TARG_DATA || 401 hdr->e_ident[EI_VERSION] != EV_CURRENT || 402 hdr->e_phentsize != sizeof(Elf_Phdr) || 403 hdr->e_version != ELF_TARG_VER) 404 return (ENOEXEC); 405 406 /* 407 * Make sure we have at least one brand for this machine. 408 */ 409 410 for (i = 0; i < MAX_BRANDS; i++) { 411 bi = elf_brand_list[i]; 412 if (bi != NULL && bi->machine == hdr->e_machine) 413 break; 414 } 415 if (i == MAX_BRANDS) 416 return (ENOEXEC); 417 418 return (0); 419 } 420 421 static int 422 __elfN(map_partial)(vm_map_t map, vm_object_t object, vm_ooffset_t offset, 423 vm_offset_t start, vm_offset_t end, vm_prot_t prot) 424 { 425 struct sf_buf *sf; 426 int error; 427 vm_offset_t off; 428 429 /* 430 * Create the page if it doesn't exist yet. Ignore errors. 431 */ 432 vm_map_fixed(map, NULL, 0, trunc_page(start), round_page(end) - 433 trunc_page(start), VM_PROT_ALL, VM_PROT_ALL, MAP_CHECK_EXCL); 434 435 /* 436 * Find the page from the underlying object. 437 */ 438 if (object != NULL) { 439 sf = vm_imgact_map_page(object, offset); 440 if (sf == NULL) 441 return (KERN_FAILURE); 442 off = offset - trunc_page(offset); 443 error = copyout((caddr_t)sf_buf_kva(sf) + off, (caddr_t)start, 444 end - start); 445 vm_imgact_unmap_page(sf); 446 if (error != 0) 447 return (KERN_FAILURE); 448 } 449 450 return (KERN_SUCCESS); 451 } 452 453 static int 454 __elfN(map_insert)(struct image_params *imgp, vm_map_t map, vm_object_t object, 455 vm_ooffset_t offset, vm_offset_t start, vm_offset_t end, vm_prot_t prot, 456 int cow) 457 { 458 struct sf_buf *sf; 459 vm_offset_t off; 460 vm_size_t sz; 461 int error, locked, rv; 462 463 if (start != trunc_page(start)) { 464 rv = __elfN(map_partial)(map, object, offset, start, 465 round_page(start), prot); 466 if (rv != KERN_SUCCESS) 467 return (rv); 468 offset += round_page(start) - start; 469 start = round_page(start); 470 } 471 if (end != round_page(end)) { 472 rv = __elfN(map_partial)(map, object, offset + 473 trunc_page(end) - start, trunc_page(end), end, prot); 474 if (rv != KERN_SUCCESS) 475 return (rv); 476 end = trunc_page(end); 477 } 478 if (start >= end) 479 return (KERN_SUCCESS); 480 if ((offset & PAGE_MASK) != 0) { 481 /* 482 * The mapping is not page aligned. This means that we have 483 * to copy the data. 484 */ 485 rv = vm_map_fixed(map, NULL, 0, start, end - start, 486 prot | VM_PROT_WRITE, VM_PROT_ALL, MAP_CHECK_EXCL); 487 if (rv != KERN_SUCCESS) 488 return (rv); 489 if (object == NULL) 490 return (KERN_SUCCESS); 491 for (; start < end; start += sz) { 492 sf = vm_imgact_map_page(object, offset); 493 if (sf == NULL) 494 return (KERN_FAILURE); 495 off = offset - trunc_page(offset); 496 sz = end - start; 497 if (sz > PAGE_SIZE - off) 498 sz = PAGE_SIZE - off; 499 error = copyout((caddr_t)sf_buf_kva(sf) + off, 500 (caddr_t)start, sz); 501 vm_imgact_unmap_page(sf); 502 if (error != 0) 503 return (KERN_FAILURE); 504 offset += sz; 505 } 506 } else { 507 vm_object_reference(object); 508 rv = vm_map_fixed(map, object, offset, start, end - start, 509 prot, VM_PROT_ALL, cow | MAP_CHECK_EXCL); 510 if (rv != KERN_SUCCESS) { 511 locked = VOP_ISLOCKED(imgp->vp); 512 VOP_UNLOCK(imgp->vp, 0); 513 vm_object_deallocate(object); 514 vn_lock(imgp->vp, locked | LK_RETRY); 515 return (rv); 516 } 517 } 518 return (KERN_SUCCESS); 519 } 520 521 static int 522 __elfN(load_section)(struct image_params *imgp, vm_ooffset_t offset, 523 caddr_t vmaddr, size_t memsz, size_t filsz, vm_prot_t prot, 524 size_t pagesize) 525 { 526 struct sf_buf *sf; 527 size_t map_len; 528 vm_map_t map; 529 vm_object_t object; 530 vm_offset_t off, map_addr; 531 int error, rv, cow; 532 size_t copy_len; 533 vm_ooffset_t file_addr; 534 535 /* 536 * It's necessary to fail if the filsz + offset taken from the 537 * header is greater than the actual file pager object's size. 538 * If we were to allow this, then the vm_map_find() below would 539 * walk right off the end of the file object and into the ether. 540 * 541 * While I'm here, might as well check for something else that 542 * is invalid: filsz cannot be greater than memsz. 543 */ 544 if ((filsz != 0 && (off_t)filsz + offset > imgp->attr->va_size) || 545 filsz > memsz) { 546 uprintf("elf_load_section: truncated ELF file\n"); 547 return (ENOEXEC); 548 } 549 550 object = imgp->object; 551 map = &imgp->proc->p_vmspace->vm_map; 552 map_addr = trunc_page_ps((vm_offset_t)vmaddr, pagesize); 553 file_addr = trunc_page_ps(offset, pagesize); 554 555 /* 556 * We have two choices. We can either clear the data in the last page 557 * of an oversized mapping, or we can start the anon mapping a page 558 * early and copy the initialized data into that first page. We 559 * choose the second. 560 */ 561 if (filsz == 0) 562 map_len = 0; 563 else if (memsz > filsz) 564 map_len = trunc_page_ps(offset + filsz, pagesize) - file_addr; 565 else 566 map_len = round_page_ps(offset + filsz, pagesize) - file_addr; 567 568 if (map_len != 0) { 569 /* cow flags: don't dump readonly sections in core */ 570 cow = MAP_COPY_ON_WRITE | MAP_PREFAULT | 571 (prot & VM_PROT_WRITE ? 0 : MAP_DISABLE_COREDUMP); 572 573 rv = __elfN(map_insert)(imgp, map, 574 object, 575 file_addr, /* file offset */ 576 map_addr, /* virtual start */ 577 map_addr + map_len,/* virtual end */ 578 prot, 579 cow); 580 if (rv != KERN_SUCCESS) 581 return (EINVAL); 582 583 /* we can stop now if we've covered it all */ 584 if (memsz == filsz) 585 return (0); 586 } 587 588 589 /* 590 * We have to get the remaining bit of the file into the first part 591 * of the oversized map segment. This is normally because the .data 592 * segment in the file is extended to provide bss. It's a neat idea 593 * to try and save a page, but it's a pain in the behind to implement. 594 */ 595 copy_len = filsz == 0 ? 0 : (offset + filsz) - trunc_page_ps(offset + 596 filsz, pagesize); 597 map_addr = trunc_page_ps((vm_offset_t)vmaddr + filsz, pagesize); 598 map_len = round_page_ps((vm_offset_t)vmaddr + memsz, pagesize) - 599 map_addr; 600 601 /* This had damn well better be true! */ 602 if (map_len != 0) { 603 rv = __elfN(map_insert)(imgp, map, NULL, 0, map_addr, 604 map_addr + map_len, prot, 0); 605 if (rv != KERN_SUCCESS) 606 return (EINVAL); 607 } 608 609 if (copy_len != 0) { 610 sf = vm_imgact_map_page(object, offset + filsz); 611 if (sf == NULL) 612 return (EIO); 613 614 /* send the page fragment to user space */ 615 off = trunc_page_ps(offset + filsz, pagesize) - 616 trunc_page(offset + filsz); 617 error = copyout((caddr_t)sf_buf_kva(sf) + off, 618 (caddr_t)map_addr, copy_len); 619 vm_imgact_unmap_page(sf); 620 if (error != 0) 621 return (error); 622 } 623 624 /* 625 * Remove write access to the page if it was only granted by map_insert 626 * to allow copyout. 627 */ 628 if ((prot & VM_PROT_WRITE) == 0) 629 vm_map_protect(map, trunc_page(map_addr), round_page(map_addr + 630 map_len), prot, FALSE); 631 632 return (0); 633 } 634 635 /* 636 * Load the file "file" into memory. It may be either a shared object 637 * or an executable. 638 * 639 * The "addr" reference parameter is in/out. On entry, it specifies 640 * the address where a shared object should be loaded. If the file is 641 * an executable, this value is ignored. On exit, "addr" specifies 642 * where the file was actually loaded. 643 * 644 * The "entry" reference parameter is out only. On exit, it specifies 645 * the entry point for the loaded file. 646 */ 647 static int 648 __elfN(load_file)(struct proc *p, const char *file, u_long *addr, 649 u_long *entry, size_t pagesize) 650 { 651 struct { 652 struct nameidata nd; 653 struct vattr attr; 654 struct image_params image_params; 655 } *tempdata; 656 const Elf_Ehdr *hdr = NULL; 657 const Elf_Phdr *phdr = NULL; 658 struct nameidata *nd; 659 struct vattr *attr; 660 struct image_params *imgp; 661 vm_prot_t prot; 662 u_long rbase; 663 u_long base_addr = 0; 664 int error, i, numsegs; 665 666 #ifdef CAPABILITY_MODE 667 /* 668 * XXXJA: This check can go away once we are sufficiently confident 669 * that the checks in namei() are correct. 670 */ 671 if (IN_CAPABILITY_MODE(curthread)) 672 return (ECAPMODE); 673 #endif 674 675 tempdata = malloc(sizeof(*tempdata), M_TEMP, M_WAITOK); 676 nd = &tempdata->nd; 677 attr = &tempdata->attr; 678 imgp = &tempdata->image_params; 679 680 /* 681 * Initialize part of the common data 682 */ 683 imgp->proc = p; 684 imgp->attr = attr; 685 imgp->firstpage = NULL; 686 imgp->image_header = NULL; 687 imgp->object = NULL; 688 imgp->execlabel = NULL; 689 690 NDINIT(nd, LOOKUP, LOCKLEAF | FOLLOW, UIO_SYSSPACE, file, curthread); 691 if ((error = namei(nd)) != 0) { 692 nd->ni_vp = NULL; 693 goto fail; 694 } 695 NDFREE(nd, NDF_ONLY_PNBUF); 696 imgp->vp = nd->ni_vp; 697 698 /* 699 * Check permissions, modes, uid, etc on the file, and "open" it. 700 */ 701 error = exec_check_permissions(imgp); 702 if (error) 703 goto fail; 704 705 error = exec_map_first_page(imgp); 706 if (error) 707 goto fail; 708 709 /* 710 * Also make certain that the interpreter stays the same, so set 711 * its VV_TEXT flag, too. 712 */ 713 VOP_SET_TEXT(nd->ni_vp); 714 715 imgp->object = nd->ni_vp->v_object; 716 717 hdr = (const Elf_Ehdr *)imgp->image_header; 718 if ((error = __elfN(check_header)(hdr)) != 0) 719 goto fail; 720 if (hdr->e_type == ET_DYN) 721 rbase = *addr; 722 else if (hdr->e_type == ET_EXEC) 723 rbase = 0; 724 else { 725 error = ENOEXEC; 726 goto fail; 727 } 728 729 /* Only support headers that fit within first page for now */ 730 if ((hdr->e_phoff > PAGE_SIZE) || 731 (u_int)hdr->e_phentsize * hdr->e_phnum > PAGE_SIZE - hdr->e_phoff) { 732 error = ENOEXEC; 733 goto fail; 734 } 735 736 phdr = (const Elf_Phdr *)(imgp->image_header + hdr->e_phoff); 737 if (!aligned(phdr, Elf_Addr)) { 738 error = ENOEXEC; 739 goto fail; 740 } 741 742 for (i = 0, numsegs = 0; i < hdr->e_phnum; i++) { 743 if (phdr[i].p_type == PT_LOAD && phdr[i].p_memsz != 0) { 744 /* Loadable segment */ 745 prot = __elfN(trans_prot)(phdr[i].p_flags); 746 error = __elfN(load_section)(imgp, phdr[i].p_offset, 747 (caddr_t)(uintptr_t)phdr[i].p_vaddr + rbase, 748 phdr[i].p_memsz, phdr[i].p_filesz, prot, pagesize); 749 if (error != 0) 750 goto fail; 751 /* 752 * Establish the base address if this is the 753 * first segment. 754 */ 755 if (numsegs == 0) 756 base_addr = trunc_page(phdr[i].p_vaddr + 757 rbase); 758 numsegs++; 759 } 760 } 761 *addr = base_addr; 762 *entry = (unsigned long)hdr->e_entry + rbase; 763 764 fail: 765 if (imgp->firstpage) 766 exec_unmap_first_page(imgp); 767 768 if (nd->ni_vp) 769 vput(nd->ni_vp); 770 771 free(tempdata, M_TEMP); 772 773 return (error); 774 } 775 776 static int 777 __CONCAT(exec_, __elfN(imgact))(struct image_params *imgp) 778 { 779 struct thread *td; 780 const Elf_Ehdr *hdr; 781 const Elf_Phdr *phdr; 782 Elf_Auxargs *elf_auxargs; 783 struct vmspace *vmspace; 784 const char *err_str, *newinterp; 785 char *interp, *interp_buf, *path; 786 Elf_Brandinfo *brand_info; 787 struct sysentvec *sv; 788 vm_prot_t prot; 789 u_long text_size, data_size, total_size, text_addr, data_addr; 790 u_long seg_size, seg_addr, addr, baddr, et_dyn_addr, entry, proghdr; 791 int32_t osrel; 792 int error, i, n, interp_name_len, have_interp; 793 794 hdr = (const Elf_Ehdr *)imgp->image_header; 795 796 /* 797 * Do we have a valid ELF header ? 798 * 799 * Only allow ET_EXEC & ET_DYN here, reject ET_DYN later 800 * if particular brand doesn't support it. 801 */ 802 if (__elfN(check_header)(hdr) != 0 || 803 (hdr->e_type != ET_EXEC && hdr->e_type != ET_DYN)) 804 return (-1); 805 806 /* 807 * From here on down, we return an errno, not -1, as we've 808 * detected an ELF file. 809 */ 810 811 if ((hdr->e_phoff > PAGE_SIZE) || 812 (u_int)hdr->e_phentsize * hdr->e_phnum > PAGE_SIZE - hdr->e_phoff) { 813 /* Only support headers in first page for now */ 814 uprintf("Program headers not in the first page\n"); 815 return (ENOEXEC); 816 } 817 phdr = (const Elf_Phdr *)(imgp->image_header + hdr->e_phoff); 818 if (!aligned(phdr, Elf_Addr)) { 819 uprintf("Unaligned program headers\n"); 820 return (ENOEXEC); 821 } 822 823 n = error = 0; 824 baddr = 0; 825 osrel = 0; 826 text_size = data_size = total_size = text_addr = data_addr = 0; 827 entry = proghdr = 0; 828 interp_name_len = 0; 829 err_str = newinterp = NULL; 830 interp = interp_buf = NULL; 831 td = curthread; 832 833 for (i = 0; i < hdr->e_phnum; i++) { 834 switch (phdr[i].p_type) { 835 case PT_LOAD: 836 if (n == 0) 837 baddr = phdr[i].p_vaddr; 838 n++; 839 break; 840 case PT_INTERP: 841 /* Path to interpreter */ 842 if (phdr[i].p_filesz > MAXPATHLEN) { 843 uprintf("Invalid PT_INTERP\n"); 844 error = ENOEXEC; 845 goto ret; 846 } 847 if (interp != NULL) { 848 uprintf("Multiple PT_INTERP headers\n"); 849 error = ENOEXEC; 850 goto ret; 851 } 852 interp_name_len = phdr[i].p_filesz; 853 if (phdr[i].p_offset > PAGE_SIZE || 854 interp_name_len > PAGE_SIZE - phdr[i].p_offset) { 855 VOP_UNLOCK(imgp->vp, 0); 856 interp_buf = malloc(interp_name_len + 1, M_TEMP, 857 M_WAITOK); 858 vn_lock(imgp->vp, LK_EXCLUSIVE | LK_RETRY); 859 error = vn_rdwr(UIO_READ, imgp->vp, interp_buf, 860 interp_name_len, phdr[i].p_offset, 861 UIO_SYSSPACE, IO_NODELOCKED, td->td_ucred, 862 NOCRED, NULL, td); 863 if (error != 0) { 864 uprintf("i/o error PT_INTERP\n"); 865 goto ret; 866 } 867 interp_buf[interp_name_len] = '\0'; 868 interp = interp_buf; 869 } else { 870 interp = __DECONST(char *, imgp->image_header) + 871 phdr[i].p_offset; 872 } 873 break; 874 case PT_GNU_STACK: 875 if (__elfN(nxstack)) 876 imgp->stack_prot = 877 __elfN(trans_prot)(phdr[i].p_flags); 878 imgp->stack_sz = phdr[i].p_memsz; 879 break; 880 } 881 } 882 883 brand_info = __elfN(get_brandinfo)(imgp, interp, interp_name_len, 884 &osrel); 885 if (brand_info == NULL) { 886 uprintf("ELF binary type \"%u\" not known.\n", 887 hdr->e_ident[EI_OSABI]); 888 error = ENOEXEC; 889 goto ret; 890 } 891 et_dyn_addr = 0; 892 if (hdr->e_type == ET_DYN) { 893 if ((brand_info->flags & BI_CAN_EXEC_DYN) == 0) { 894 uprintf("Cannot execute shared object\n"); 895 error = ENOEXEC; 896 goto ret; 897 } 898 /* 899 * Honour the base load address from the dso if it is 900 * non-zero for some reason. 901 */ 902 if (baddr == 0) 903 et_dyn_addr = ET_DYN_LOAD_ADDR; 904 } 905 sv = brand_info->sysvec; 906 if (interp != NULL && brand_info->interp_newpath != NULL) 907 newinterp = brand_info->interp_newpath; 908 909 /* 910 * Avoid a possible deadlock if the current address space is destroyed 911 * and that address space maps the locked vnode. In the common case, 912 * the locked vnode's v_usecount is decremented but remains greater 913 * than zero. Consequently, the vnode lock is not needed by vrele(). 914 * However, in cases where the vnode lock is external, such as nullfs, 915 * v_usecount may become zero. 916 * 917 * The VV_TEXT flag prevents modifications to the executable while 918 * the vnode is unlocked. 919 */ 920 VOP_UNLOCK(imgp->vp, 0); 921 922 error = exec_new_vmspace(imgp, sv); 923 imgp->proc->p_sysent = sv; 924 925 vn_lock(imgp->vp, LK_EXCLUSIVE | LK_RETRY); 926 if (error != 0) 927 goto ret; 928 929 for (i = 0; i < hdr->e_phnum; i++) { 930 switch (phdr[i].p_type) { 931 case PT_LOAD: /* Loadable segment */ 932 if (phdr[i].p_memsz == 0) 933 break; 934 prot = __elfN(trans_prot)(phdr[i].p_flags); 935 error = __elfN(load_section)(imgp, phdr[i].p_offset, 936 (caddr_t)(uintptr_t)phdr[i].p_vaddr + et_dyn_addr, 937 phdr[i].p_memsz, phdr[i].p_filesz, prot, 938 sv->sv_pagesize); 939 if (error != 0) 940 goto ret; 941 942 /* 943 * If this segment contains the program headers, 944 * remember their virtual address for the AT_PHDR 945 * aux entry. Static binaries don't usually include 946 * a PT_PHDR entry. 947 */ 948 if (phdr[i].p_offset == 0 && 949 hdr->e_phoff + hdr->e_phnum * hdr->e_phentsize 950 <= phdr[i].p_filesz) 951 proghdr = phdr[i].p_vaddr + hdr->e_phoff + 952 et_dyn_addr; 953 954 seg_addr = trunc_page(phdr[i].p_vaddr + et_dyn_addr); 955 seg_size = round_page(phdr[i].p_memsz + 956 phdr[i].p_vaddr + et_dyn_addr - seg_addr); 957 958 /* 959 * Make the largest executable segment the official 960 * text segment and all others data. 961 * 962 * Note that obreak() assumes that data_addr + 963 * data_size == end of data load area, and the ELF 964 * file format expects segments to be sorted by 965 * address. If multiple data segments exist, the 966 * last one will be used. 967 */ 968 969 if (phdr[i].p_flags & PF_X && text_size < seg_size) { 970 text_size = seg_size; 971 text_addr = seg_addr; 972 } else { 973 data_size = seg_size; 974 data_addr = seg_addr; 975 } 976 total_size += seg_size; 977 break; 978 case PT_PHDR: /* Program header table info */ 979 proghdr = phdr[i].p_vaddr + et_dyn_addr; 980 break; 981 default: 982 break; 983 } 984 } 985 986 if (data_addr == 0 && data_size == 0) { 987 data_addr = text_addr; 988 data_size = text_size; 989 } 990 991 entry = (u_long)hdr->e_entry + et_dyn_addr; 992 993 /* 994 * Check limits. It should be safe to check the 995 * limits after loading the segments since we do 996 * not actually fault in all the segments pages. 997 */ 998 PROC_LOCK(imgp->proc); 999 if (data_size > lim_cur_proc(imgp->proc, RLIMIT_DATA)) 1000 err_str = "Data segment size exceeds process limit"; 1001 else if (text_size > maxtsiz) 1002 err_str = "Text segment size exceeds system limit"; 1003 else if (total_size > lim_cur_proc(imgp->proc, RLIMIT_VMEM)) 1004 err_str = "Total segment size exceeds process limit"; 1005 else if (racct_set(imgp->proc, RACCT_DATA, data_size) != 0) 1006 err_str = "Data segment size exceeds resource limit"; 1007 else if (racct_set(imgp->proc, RACCT_VMEM, total_size) != 0) 1008 err_str = "Total segment size exceeds resource limit"; 1009 if (err_str != NULL) { 1010 PROC_UNLOCK(imgp->proc); 1011 uprintf("%s\n", err_str); 1012 error = ENOMEM; 1013 goto ret; 1014 } 1015 1016 vmspace = imgp->proc->p_vmspace; 1017 vmspace->vm_tsize = text_size >> PAGE_SHIFT; 1018 vmspace->vm_taddr = (caddr_t)(uintptr_t)text_addr; 1019 vmspace->vm_dsize = data_size >> PAGE_SHIFT; 1020 vmspace->vm_daddr = (caddr_t)(uintptr_t)data_addr; 1021 1022 /* 1023 * We load the dynamic linker where a userland call 1024 * to mmap(0, ...) would put it. The rationale behind this 1025 * calculation is that it leaves room for the heap to grow to 1026 * its maximum allowed size. 1027 */ 1028 addr = round_page((vm_offset_t)vmspace->vm_daddr + lim_max(td, 1029 RLIMIT_DATA)); 1030 PROC_UNLOCK(imgp->proc); 1031 1032 imgp->entry_addr = entry; 1033 1034 if (interp != NULL) { 1035 have_interp = FALSE; 1036 VOP_UNLOCK(imgp->vp, 0); 1037 if (brand_info->emul_path != NULL && 1038 brand_info->emul_path[0] != '\0') { 1039 path = malloc(MAXPATHLEN, M_TEMP, M_WAITOK); 1040 snprintf(path, MAXPATHLEN, "%s%s", 1041 brand_info->emul_path, interp); 1042 error = __elfN(load_file)(imgp->proc, path, &addr, 1043 &imgp->entry_addr, sv->sv_pagesize); 1044 free(path, M_TEMP); 1045 if (error == 0) 1046 have_interp = TRUE; 1047 } 1048 if (!have_interp && newinterp != NULL && 1049 (brand_info->interp_path == NULL || 1050 strcmp(interp, brand_info->interp_path) == 0)) { 1051 error = __elfN(load_file)(imgp->proc, newinterp, &addr, 1052 &imgp->entry_addr, sv->sv_pagesize); 1053 if (error == 0) 1054 have_interp = TRUE; 1055 } 1056 if (!have_interp) { 1057 error = __elfN(load_file)(imgp->proc, interp, &addr, 1058 &imgp->entry_addr, sv->sv_pagesize); 1059 } 1060 vn_lock(imgp->vp, LK_EXCLUSIVE | LK_RETRY); 1061 if (error != 0) { 1062 uprintf("ELF interpreter %s not found, error %d\n", 1063 interp, error); 1064 goto ret; 1065 } 1066 } else 1067 addr = et_dyn_addr; 1068 1069 /* 1070 * Construct auxargs table (used by the fixup routine) 1071 */ 1072 elf_auxargs = malloc(sizeof(Elf_Auxargs), M_TEMP, M_WAITOK); 1073 elf_auxargs->execfd = -1; 1074 elf_auxargs->phdr = proghdr; 1075 elf_auxargs->phent = hdr->e_phentsize; 1076 elf_auxargs->phnum = hdr->e_phnum; 1077 elf_auxargs->pagesz = PAGE_SIZE; 1078 elf_auxargs->base = addr; 1079 elf_auxargs->flags = 0; 1080 elf_auxargs->entry = entry; 1081 elf_auxargs->hdr_eflags = hdr->e_flags; 1082 1083 imgp->auxargs = elf_auxargs; 1084 imgp->interpreted = 0; 1085 imgp->reloc_base = addr; 1086 imgp->proc->p_osrel = osrel; 1087 imgp->proc->p_elf_machine = hdr->e_machine; 1088 imgp->proc->p_elf_flags = hdr->e_flags; 1089 1090 ret: 1091 free(interp_buf, M_TEMP); 1092 return (error); 1093 } 1094 1095 #define suword __CONCAT(suword, __ELF_WORD_SIZE) 1096 1097 int 1098 __elfN(freebsd_fixup)(register_t **stack_base, struct image_params *imgp) 1099 { 1100 Elf_Auxargs *args = (Elf_Auxargs *)imgp->auxargs; 1101 Elf_Auxinfo *argarray, *pos; 1102 Elf_Addr *base, *auxbase; 1103 int error; 1104 1105 base = (Elf_Addr *)*stack_base; 1106 auxbase = base + imgp->args->argc + 1 + imgp->args->envc + 1; 1107 argarray = pos = malloc(AT_COUNT * sizeof(*pos), M_TEMP, 1108 M_WAITOK | M_ZERO); 1109 1110 if (args->execfd != -1) 1111 AUXARGS_ENTRY(pos, AT_EXECFD, args->execfd); 1112 AUXARGS_ENTRY(pos, AT_PHDR, args->phdr); 1113 AUXARGS_ENTRY(pos, AT_PHENT, args->phent); 1114 AUXARGS_ENTRY(pos, AT_PHNUM, args->phnum); 1115 AUXARGS_ENTRY(pos, AT_PAGESZ, args->pagesz); 1116 AUXARGS_ENTRY(pos, AT_FLAGS, args->flags); 1117 AUXARGS_ENTRY(pos, AT_ENTRY, args->entry); 1118 AUXARGS_ENTRY(pos, AT_BASE, args->base); 1119 AUXARGS_ENTRY(pos, AT_EHDRFLAGS, args->hdr_eflags); 1120 if (imgp->execpathp != 0) 1121 AUXARGS_ENTRY(pos, AT_EXECPATH, imgp->execpathp); 1122 AUXARGS_ENTRY(pos, AT_OSRELDATE, 1123 imgp->proc->p_ucred->cr_prison->pr_osreldate); 1124 if (imgp->canary != 0) { 1125 AUXARGS_ENTRY(pos, AT_CANARY, imgp->canary); 1126 AUXARGS_ENTRY(pos, AT_CANARYLEN, imgp->canarylen); 1127 } 1128 AUXARGS_ENTRY(pos, AT_NCPUS, mp_ncpus); 1129 if (imgp->pagesizes != 0) { 1130 AUXARGS_ENTRY(pos, AT_PAGESIZES, imgp->pagesizes); 1131 AUXARGS_ENTRY(pos, AT_PAGESIZESLEN, imgp->pagesizeslen); 1132 } 1133 if (imgp->sysent->sv_timekeep_base != 0) { 1134 AUXARGS_ENTRY(pos, AT_TIMEKEEP, 1135 imgp->sysent->sv_timekeep_base); 1136 } 1137 AUXARGS_ENTRY(pos, AT_STACKPROT, imgp->sysent->sv_shared_page_obj 1138 != NULL && imgp->stack_prot != 0 ? imgp->stack_prot : 1139 imgp->sysent->sv_stackprot); 1140 if (imgp->sysent->sv_hwcap != NULL) 1141 AUXARGS_ENTRY(pos, AT_HWCAP, *imgp->sysent->sv_hwcap); 1142 if (imgp->sysent->sv_hwcap2 != NULL) 1143 AUXARGS_ENTRY(pos, AT_HWCAP2, *imgp->sysent->sv_hwcap2); 1144 AUXARGS_ENTRY(pos, AT_NULL, 0); 1145 1146 free(imgp->auxargs, M_TEMP); 1147 imgp->auxargs = NULL; 1148 KASSERT(pos - argarray <= AT_COUNT, ("Too many auxargs")); 1149 1150 error = copyout(argarray, auxbase, sizeof(*argarray) * AT_COUNT); 1151 free(argarray, M_TEMP); 1152 if (error != 0) 1153 return (error); 1154 1155 base--; 1156 if (suword(base, imgp->args->argc) == -1) 1157 return (EFAULT); 1158 *stack_base = (register_t *)base; 1159 return (0); 1160 } 1161 1162 /* 1163 * Code for generating ELF core dumps. 1164 */ 1165 1166 typedef void (*segment_callback)(vm_map_entry_t, void *); 1167 1168 /* Closure for cb_put_phdr(). */ 1169 struct phdr_closure { 1170 Elf_Phdr *phdr; /* Program header to fill in */ 1171 Elf_Off offset; /* Offset of segment in core file */ 1172 }; 1173 1174 /* Closure for cb_size_segment(). */ 1175 struct sseg_closure { 1176 int count; /* Count of writable segments. */ 1177 size_t size; /* Total size of all writable segments. */ 1178 }; 1179 1180 typedef void (*outfunc_t)(void *, struct sbuf *, size_t *); 1181 1182 struct note_info { 1183 int type; /* Note type. */ 1184 outfunc_t outfunc; /* Output function. */ 1185 void *outarg; /* Argument for the output function. */ 1186 size_t outsize; /* Output size. */ 1187 TAILQ_ENTRY(note_info) link; /* Link to the next note info. */ 1188 }; 1189 1190 TAILQ_HEAD(note_info_list, note_info); 1191 1192 /* Coredump output parameters. */ 1193 struct coredump_params { 1194 off_t offset; 1195 struct ucred *active_cred; 1196 struct ucred *file_cred; 1197 struct thread *td; 1198 struct vnode *vp; 1199 struct compressor *comp; 1200 }; 1201 1202 extern int compress_user_cores; 1203 extern int compress_user_cores_level; 1204 1205 static void cb_put_phdr(vm_map_entry_t, void *); 1206 static void cb_size_segment(vm_map_entry_t, void *); 1207 static int core_write(struct coredump_params *, const void *, size_t, off_t, 1208 enum uio_seg); 1209 static void each_dumpable_segment(struct thread *, segment_callback, void *); 1210 static int __elfN(corehdr)(struct coredump_params *, int, void *, size_t, 1211 struct note_info_list *, size_t); 1212 static void __elfN(prepare_notes)(struct thread *, struct note_info_list *, 1213 size_t *); 1214 static void __elfN(puthdr)(struct thread *, void *, size_t, int, size_t); 1215 static void __elfN(putnote)(struct note_info *, struct sbuf *); 1216 static size_t register_note(struct note_info_list *, int, outfunc_t, void *); 1217 static int sbuf_drain_core_output(void *, const char *, int); 1218 static int sbuf_drain_count(void *arg, const char *data, int len); 1219 1220 static void __elfN(note_fpregset)(void *, struct sbuf *, size_t *); 1221 static void __elfN(note_prpsinfo)(void *, struct sbuf *, size_t *); 1222 static void __elfN(note_prstatus)(void *, struct sbuf *, size_t *); 1223 static void __elfN(note_threadmd)(void *, struct sbuf *, size_t *); 1224 static void __elfN(note_thrmisc)(void *, struct sbuf *, size_t *); 1225 static void __elfN(note_ptlwpinfo)(void *, struct sbuf *, size_t *); 1226 static void __elfN(note_procstat_auxv)(void *, struct sbuf *, size_t *); 1227 static void __elfN(note_procstat_proc)(void *, struct sbuf *, size_t *); 1228 static void __elfN(note_procstat_psstrings)(void *, struct sbuf *, size_t *); 1229 static void note_procstat_files(void *, struct sbuf *, size_t *); 1230 static void note_procstat_groups(void *, struct sbuf *, size_t *); 1231 static void note_procstat_osrel(void *, struct sbuf *, size_t *); 1232 static void note_procstat_rlimit(void *, struct sbuf *, size_t *); 1233 static void note_procstat_umask(void *, struct sbuf *, size_t *); 1234 static void note_procstat_vmmap(void *, struct sbuf *, size_t *); 1235 1236 /* 1237 * Write out a core segment to the compression stream. 1238 */ 1239 static int 1240 compress_chunk(struct coredump_params *p, char *base, char *buf, u_int len) 1241 { 1242 u_int chunk_len; 1243 int error; 1244 1245 while (len > 0) { 1246 chunk_len = MIN(len, CORE_BUF_SIZE); 1247 1248 /* 1249 * We can get EFAULT error here. 1250 * In that case zero out the current chunk of the segment. 1251 */ 1252 error = copyin(base, buf, chunk_len); 1253 if (error != 0) 1254 bzero(buf, chunk_len); 1255 error = compressor_write(p->comp, buf, chunk_len); 1256 if (error != 0) 1257 break; 1258 base += chunk_len; 1259 len -= chunk_len; 1260 } 1261 return (error); 1262 } 1263 1264 static int 1265 core_compressed_write(void *base, size_t len, off_t offset, void *arg) 1266 { 1267 1268 return (core_write((struct coredump_params *)arg, base, len, offset, 1269 UIO_SYSSPACE)); 1270 } 1271 1272 static int 1273 core_write(struct coredump_params *p, const void *base, size_t len, 1274 off_t offset, enum uio_seg seg) 1275 { 1276 1277 return (vn_rdwr_inchunks(UIO_WRITE, p->vp, __DECONST(void *, base), 1278 len, offset, seg, IO_UNIT | IO_DIRECT | IO_RANGELOCKED, 1279 p->active_cred, p->file_cred, NULL, p->td)); 1280 } 1281 1282 static int 1283 core_output(void *base, size_t len, off_t offset, struct coredump_params *p, 1284 void *tmpbuf) 1285 { 1286 int error; 1287 1288 if (p->comp != NULL) 1289 return (compress_chunk(p, base, tmpbuf, len)); 1290 1291 /* 1292 * EFAULT is a non-fatal error that we can get, for example, 1293 * if the segment is backed by a file but extends beyond its 1294 * end. 1295 */ 1296 error = core_write(p, base, len, offset, UIO_USERSPACE); 1297 if (error == EFAULT) { 1298 log(LOG_WARNING, "Failed to fully fault in a core file segment " 1299 "at VA %p with size 0x%zx to be written at offset 0x%jx " 1300 "for process %s\n", base, len, offset, curproc->p_comm); 1301 1302 /* 1303 * Write a "real" zero byte at the end of the target region 1304 * in the case this is the last segment. 1305 * The intermediate space will be implicitly zero-filled. 1306 */ 1307 error = core_write(p, zero_region, 1, offset + len - 1, 1308 UIO_SYSSPACE); 1309 } 1310 return (error); 1311 } 1312 1313 /* 1314 * Drain into a core file. 1315 */ 1316 static int 1317 sbuf_drain_core_output(void *arg, const char *data, int len) 1318 { 1319 struct coredump_params *p; 1320 int error, locked; 1321 1322 p = (struct coredump_params *)arg; 1323 1324 /* 1325 * Some kern_proc out routines that print to this sbuf may 1326 * call us with the process lock held. Draining with the 1327 * non-sleepable lock held is unsafe. The lock is needed for 1328 * those routines when dumping a live process. In our case we 1329 * can safely release the lock before draining and acquire 1330 * again after. 1331 */ 1332 locked = PROC_LOCKED(p->td->td_proc); 1333 if (locked) 1334 PROC_UNLOCK(p->td->td_proc); 1335 if (p->comp != NULL) 1336 error = compressor_write(p->comp, __DECONST(char *, data), len); 1337 else 1338 error = core_write(p, __DECONST(void *, data), len, p->offset, 1339 UIO_SYSSPACE); 1340 if (locked) 1341 PROC_LOCK(p->td->td_proc); 1342 if (error != 0) 1343 return (-error); 1344 p->offset += len; 1345 return (len); 1346 } 1347 1348 /* 1349 * Drain into a counter. 1350 */ 1351 static int 1352 sbuf_drain_count(void *arg, const char *data __unused, int len) 1353 { 1354 size_t *sizep; 1355 1356 sizep = (size_t *)arg; 1357 *sizep += len; 1358 return (len); 1359 } 1360 1361 int 1362 __elfN(coredump)(struct thread *td, struct vnode *vp, off_t limit, int flags) 1363 { 1364 struct ucred *cred = td->td_ucred; 1365 int error = 0; 1366 struct sseg_closure seginfo; 1367 struct note_info_list notelst; 1368 struct coredump_params params; 1369 struct note_info *ninfo; 1370 void *hdr, *tmpbuf; 1371 size_t hdrsize, notesz, coresize; 1372 1373 hdr = NULL; 1374 tmpbuf = NULL; 1375 TAILQ_INIT(¬elst); 1376 1377 /* Size the program segments. */ 1378 seginfo.count = 0; 1379 seginfo.size = 0; 1380 each_dumpable_segment(td, cb_size_segment, &seginfo); 1381 1382 /* 1383 * Collect info about the core file header area. 1384 */ 1385 hdrsize = sizeof(Elf_Ehdr) + sizeof(Elf_Phdr) * (1 + seginfo.count); 1386 if (seginfo.count + 1 >= PN_XNUM) 1387 hdrsize += sizeof(Elf_Shdr); 1388 __elfN(prepare_notes)(td, ¬elst, ¬esz); 1389 coresize = round_page(hdrsize + notesz) + seginfo.size; 1390 1391 /* Set up core dump parameters. */ 1392 params.offset = 0; 1393 params.active_cred = cred; 1394 params.file_cred = NOCRED; 1395 params.td = td; 1396 params.vp = vp; 1397 params.comp = NULL; 1398 1399 #ifdef RACCT 1400 if (racct_enable) { 1401 PROC_LOCK(td->td_proc); 1402 error = racct_add(td->td_proc, RACCT_CORE, coresize); 1403 PROC_UNLOCK(td->td_proc); 1404 if (error != 0) { 1405 error = EFAULT; 1406 goto done; 1407 } 1408 } 1409 #endif 1410 if (coresize >= limit) { 1411 error = EFAULT; 1412 goto done; 1413 } 1414 1415 /* Create a compression stream if necessary. */ 1416 if (compress_user_cores != 0) { 1417 params.comp = compressor_init(core_compressed_write, 1418 compress_user_cores, CORE_BUF_SIZE, 1419 compress_user_cores_level, ¶ms); 1420 if (params.comp == NULL) { 1421 error = EFAULT; 1422 goto done; 1423 } 1424 tmpbuf = malloc(CORE_BUF_SIZE, M_TEMP, M_WAITOK | M_ZERO); 1425 } 1426 1427 /* 1428 * Allocate memory for building the header, fill it up, 1429 * and write it out following the notes. 1430 */ 1431 hdr = malloc(hdrsize, M_TEMP, M_WAITOK); 1432 error = __elfN(corehdr)(¶ms, seginfo.count, hdr, hdrsize, ¬elst, 1433 notesz); 1434 1435 /* Write the contents of all of the writable segments. */ 1436 if (error == 0) { 1437 Elf_Phdr *php; 1438 off_t offset; 1439 int i; 1440 1441 php = (Elf_Phdr *)((char *)hdr + sizeof(Elf_Ehdr)) + 1; 1442 offset = round_page(hdrsize + notesz); 1443 for (i = 0; i < seginfo.count; i++) { 1444 error = core_output((caddr_t)(uintptr_t)php->p_vaddr, 1445 php->p_filesz, offset, ¶ms, tmpbuf); 1446 if (error != 0) 1447 break; 1448 offset += php->p_filesz; 1449 php++; 1450 } 1451 if (error == 0 && params.comp != NULL) 1452 error = compressor_flush(params.comp); 1453 } 1454 if (error) { 1455 log(LOG_WARNING, 1456 "Failed to write core file for process %s (error %d)\n", 1457 curproc->p_comm, error); 1458 } 1459 1460 done: 1461 free(tmpbuf, M_TEMP); 1462 if (params.comp != NULL) 1463 compressor_fini(params.comp); 1464 while ((ninfo = TAILQ_FIRST(¬elst)) != NULL) { 1465 TAILQ_REMOVE(¬elst, ninfo, link); 1466 free(ninfo, M_TEMP); 1467 } 1468 if (hdr != NULL) 1469 free(hdr, M_TEMP); 1470 1471 return (error); 1472 } 1473 1474 /* 1475 * A callback for each_dumpable_segment() to write out the segment's 1476 * program header entry. 1477 */ 1478 static void 1479 cb_put_phdr(vm_map_entry_t entry, void *closure) 1480 { 1481 struct phdr_closure *phc = (struct phdr_closure *)closure; 1482 Elf_Phdr *phdr = phc->phdr; 1483 1484 phc->offset = round_page(phc->offset); 1485 1486 phdr->p_type = PT_LOAD; 1487 phdr->p_offset = phc->offset; 1488 phdr->p_vaddr = entry->start; 1489 phdr->p_paddr = 0; 1490 phdr->p_filesz = phdr->p_memsz = entry->end - entry->start; 1491 phdr->p_align = PAGE_SIZE; 1492 phdr->p_flags = __elfN(untrans_prot)(entry->protection); 1493 1494 phc->offset += phdr->p_filesz; 1495 phc->phdr++; 1496 } 1497 1498 /* 1499 * A callback for each_dumpable_segment() to gather information about 1500 * the number of segments and their total size. 1501 */ 1502 static void 1503 cb_size_segment(vm_map_entry_t entry, void *closure) 1504 { 1505 struct sseg_closure *ssc = (struct sseg_closure *)closure; 1506 1507 ssc->count++; 1508 ssc->size += entry->end - entry->start; 1509 } 1510 1511 /* 1512 * For each writable segment in the process's memory map, call the given 1513 * function with a pointer to the map entry and some arbitrary 1514 * caller-supplied data. 1515 */ 1516 static void 1517 each_dumpable_segment(struct thread *td, segment_callback func, void *closure) 1518 { 1519 struct proc *p = td->td_proc; 1520 vm_map_t map = &p->p_vmspace->vm_map; 1521 vm_map_entry_t entry; 1522 vm_object_t backing_object, object; 1523 boolean_t ignore_entry; 1524 1525 vm_map_lock_read(map); 1526 for (entry = map->header.next; entry != &map->header; 1527 entry = entry->next) { 1528 /* 1529 * Don't dump inaccessible mappings, deal with legacy 1530 * coredump mode. 1531 * 1532 * Note that read-only segments related to the elf binary 1533 * are marked MAP_ENTRY_NOCOREDUMP now so we no longer 1534 * need to arbitrarily ignore such segments. 1535 */ 1536 if (elf_legacy_coredump) { 1537 if ((entry->protection & VM_PROT_RW) != VM_PROT_RW) 1538 continue; 1539 } else { 1540 if ((entry->protection & VM_PROT_ALL) == 0) 1541 continue; 1542 } 1543 1544 /* 1545 * Dont include memory segment in the coredump if 1546 * MAP_NOCORE is set in mmap(2) or MADV_NOCORE in 1547 * madvise(2). Do not dump submaps (i.e. parts of the 1548 * kernel map). 1549 */ 1550 if (entry->eflags & (MAP_ENTRY_NOCOREDUMP|MAP_ENTRY_IS_SUB_MAP)) 1551 continue; 1552 1553 if ((object = entry->object.vm_object) == NULL) 1554 continue; 1555 1556 /* Ignore memory-mapped devices and such things. */ 1557 VM_OBJECT_RLOCK(object); 1558 while ((backing_object = object->backing_object) != NULL) { 1559 VM_OBJECT_RLOCK(backing_object); 1560 VM_OBJECT_RUNLOCK(object); 1561 object = backing_object; 1562 } 1563 ignore_entry = object->type != OBJT_DEFAULT && 1564 object->type != OBJT_SWAP && object->type != OBJT_VNODE && 1565 object->type != OBJT_PHYS; 1566 VM_OBJECT_RUNLOCK(object); 1567 if (ignore_entry) 1568 continue; 1569 1570 (*func)(entry, closure); 1571 } 1572 vm_map_unlock_read(map); 1573 } 1574 1575 /* 1576 * Write the core file header to the file, including padding up to 1577 * the page boundary. 1578 */ 1579 static int 1580 __elfN(corehdr)(struct coredump_params *p, int numsegs, void *hdr, 1581 size_t hdrsize, struct note_info_list *notelst, size_t notesz) 1582 { 1583 struct note_info *ninfo; 1584 struct sbuf *sb; 1585 int error; 1586 1587 /* Fill in the header. */ 1588 bzero(hdr, hdrsize); 1589 __elfN(puthdr)(p->td, hdr, hdrsize, numsegs, notesz); 1590 1591 sb = sbuf_new(NULL, NULL, CORE_BUF_SIZE, SBUF_FIXEDLEN); 1592 sbuf_set_drain(sb, sbuf_drain_core_output, p); 1593 sbuf_start_section(sb, NULL); 1594 sbuf_bcat(sb, hdr, hdrsize); 1595 TAILQ_FOREACH(ninfo, notelst, link) 1596 __elfN(putnote)(ninfo, sb); 1597 /* Align up to a page boundary for the program segments. */ 1598 sbuf_end_section(sb, -1, PAGE_SIZE, 0); 1599 error = sbuf_finish(sb); 1600 sbuf_delete(sb); 1601 1602 return (error); 1603 } 1604 1605 static void 1606 __elfN(prepare_notes)(struct thread *td, struct note_info_list *list, 1607 size_t *sizep) 1608 { 1609 struct proc *p; 1610 struct thread *thr; 1611 size_t size; 1612 1613 p = td->td_proc; 1614 size = 0; 1615 1616 size += register_note(list, NT_PRPSINFO, __elfN(note_prpsinfo), p); 1617 1618 /* 1619 * To have the debugger select the right thread (LWP) as the initial 1620 * thread, we dump the state of the thread passed to us in td first. 1621 * This is the thread that causes the core dump and thus likely to 1622 * be the right thread one wants to have selected in the debugger. 1623 */ 1624 thr = td; 1625 while (thr != NULL) { 1626 size += register_note(list, NT_PRSTATUS, 1627 __elfN(note_prstatus), thr); 1628 size += register_note(list, NT_FPREGSET, 1629 __elfN(note_fpregset), thr); 1630 size += register_note(list, NT_THRMISC, 1631 __elfN(note_thrmisc), thr); 1632 size += register_note(list, NT_PTLWPINFO, 1633 __elfN(note_ptlwpinfo), thr); 1634 size += register_note(list, -1, 1635 __elfN(note_threadmd), thr); 1636 1637 thr = (thr == td) ? TAILQ_FIRST(&p->p_threads) : 1638 TAILQ_NEXT(thr, td_plist); 1639 if (thr == td) 1640 thr = TAILQ_NEXT(thr, td_plist); 1641 } 1642 1643 size += register_note(list, NT_PROCSTAT_PROC, 1644 __elfN(note_procstat_proc), p); 1645 size += register_note(list, NT_PROCSTAT_FILES, 1646 note_procstat_files, p); 1647 size += register_note(list, NT_PROCSTAT_VMMAP, 1648 note_procstat_vmmap, p); 1649 size += register_note(list, NT_PROCSTAT_GROUPS, 1650 note_procstat_groups, p); 1651 size += register_note(list, NT_PROCSTAT_UMASK, 1652 note_procstat_umask, p); 1653 size += register_note(list, NT_PROCSTAT_RLIMIT, 1654 note_procstat_rlimit, p); 1655 size += register_note(list, NT_PROCSTAT_OSREL, 1656 note_procstat_osrel, p); 1657 size += register_note(list, NT_PROCSTAT_PSSTRINGS, 1658 __elfN(note_procstat_psstrings), p); 1659 size += register_note(list, NT_PROCSTAT_AUXV, 1660 __elfN(note_procstat_auxv), p); 1661 1662 *sizep = size; 1663 } 1664 1665 static void 1666 __elfN(puthdr)(struct thread *td, void *hdr, size_t hdrsize, int numsegs, 1667 size_t notesz) 1668 { 1669 Elf_Ehdr *ehdr; 1670 Elf_Phdr *phdr; 1671 Elf_Shdr *shdr; 1672 struct phdr_closure phc; 1673 1674 ehdr = (Elf_Ehdr *)hdr; 1675 1676 ehdr->e_ident[EI_MAG0] = ELFMAG0; 1677 ehdr->e_ident[EI_MAG1] = ELFMAG1; 1678 ehdr->e_ident[EI_MAG2] = ELFMAG2; 1679 ehdr->e_ident[EI_MAG3] = ELFMAG3; 1680 ehdr->e_ident[EI_CLASS] = ELF_CLASS; 1681 ehdr->e_ident[EI_DATA] = ELF_DATA; 1682 ehdr->e_ident[EI_VERSION] = EV_CURRENT; 1683 ehdr->e_ident[EI_OSABI] = ELFOSABI_FREEBSD; 1684 ehdr->e_ident[EI_ABIVERSION] = 0; 1685 ehdr->e_ident[EI_PAD] = 0; 1686 ehdr->e_type = ET_CORE; 1687 ehdr->e_machine = td->td_proc->p_elf_machine; 1688 ehdr->e_version = EV_CURRENT; 1689 ehdr->e_entry = 0; 1690 ehdr->e_phoff = sizeof(Elf_Ehdr); 1691 ehdr->e_flags = td->td_proc->p_elf_flags; 1692 ehdr->e_ehsize = sizeof(Elf_Ehdr); 1693 ehdr->e_phentsize = sizeof(Elf_Phdr); 1694 ehdr->e_shentsize = sizeof(Elf_Shdr); 1695 ehdr->e_shstrndx = SHN_UNDEF; 1696 if (numsegs + 1 < PN_XNUM) { 1697 ehdr->e_phnum = numsegs + 1; 1698 ehdr->e_shnum = 0; 1699 } else { 1700 ehdr->e_phnum = PN_XNUM; 1701 ehdr->e_shnum = 1; 1702 1703 ehdr->e_shoff = ehdr->e_phoff + 1704 (numsegs + 1) * ehdr->e_phentsize; 1705 KASSERT(ehdr->e_shoff == hdrsize - sizeof(Elf_Shdr), 1706 ("e_shoff: %zu, hdrsize - shdr: %zu", 1707 (size_t)ehdr->e_shoff, hdrsize - sizeof(Elf_Shdr))); 1708 1709 shdr = (Elf_Shdr *)((char *)hdr + ehdr->e_shoff); 1710 memset(shdr, 0, sizeof(*shdr)); 1711 /* 1712 * A special first section is used to hold large segment and 1713 * section counts. This was proposed by Sun Microsystems in 1714 * Solaris and has been adopted by Linux; the standard ELF 1715 * tools are already familiar with the technique. 1716 * 1717 * See table 7-7 of the Solaris "Linker and Libraries Guide" 1718 * (or 12-7 depending on the version of the document) for more 1719 * details. 1720 */ 1721 shdr->sh_type = SHT_NULL; 1722 shdr->sh_size = ehdr->e_shnum; 1723 shdr->sh_link = ehdr->e_shstrndx; 1724 shdr->sh_info = numsegs + 1; 1725 } 1726 1727 /* 1728 * Fill in the program header entries. 1729 */ 1730 phdr = (Elf_Phdr *)((char *)hdr + ehdr->e_phoff); 1731 1732 /* The note segement. */ 1733 phdr->p_type = PT_NOTE; 1734 phdr->p_offset = hdrsize; 1735 phdr->p_vaddr = 0; 1736 phdr->p_paddr = 0; 1737 phdr->p_filesz = notesz; 1738 phdr->p_memsz = 0; 1739 phdr->p_flags = PF_R; 1740 phdr->p_align = ELF_NOTE_ROUNDSIZE; 1741 phdr++; 1742 1743 /* All the writable segments from the program. */ 1744 phc.phdr = phdr; 1745 phc.offset = round_page(hdrsize + notesz); 1746 each_dumpable_segment(td, cb_put_phdr, &phc); 1747 } 1748 1749 static size_t 1750 register_note(struct note_info_list *list, int type, outfunc_t out, void *arg) 1751 { 1752 struct note_info *ninfo; 1753 size_t size, notesize; 1754 1755 size = 0; 1756 out(arg, NULL, &size); 1757 ninfo = malloc(sizeof(*ninfo), M_TEMP, M_ZERO | M_WAITOK); 1758 ninfo->type = type; 1759 ninfo->outfunc = out; 1760 ninfo->outarg = arg; 1761 ninfo->outsize = size; 1762 TAILQ_INSERT_TAIL(list, ninfo, link); 1763 1764 if (type == -1) 1765 return (size); 1766 1767 notesize = sizeof(Elf_Note) + /* note header */ 1768 roundup2(sizeof(FREEBSD_ABI_VENDOR), ELF_NOTE_ROUNDSIZE) + 1769 /* note name */ 1770 roundup2(size, ELF_NOTE_ROUNDSIZE); /* note description */ 1771 1772 return (notesize); 1773 } 1774 1775 static size_t 1776 append_note_data(const void *src, void *dst, size_t len) 1777 { 1778 size_t padded_len; 1779 1780 padded_len = roundup2(len, ELF_NOTE_ROUNDSIZE); 1781 if (dst != NULL) { 1782 bcopy(src, dst, len); 1783 bzero((char *)dst + len, padded_len - len); 1784 } 1785 return (padded_len); 1786 } 1787 1788 size_t 1789 __elfN(populate_note)(int type, void *src, void *dst, size_t size, void **descp) 1790 { 1791 Elf_Note *note; 1792 char *buf; 1793 size_t notesize; 1794 1795 buf = dst; 1796 if (buf != NULL) { 1797 note = (Elf_Note *)buf; 1798 note->n_namesz = sizeof(FREEBSD_ABI_VENDOR); 1799 note->n_descsz = size; 1800 note->n_type = type; 1801 buf += sizeof(*note); 1802 buf += append_note_data(FREEBSD_ABI_VENDOR, buf, 1803 sizeof(FREEBSD_ABI_VENDOR)); 1804 append_note_data(src, buf, size); 1805 if (descp != NULL) 1806 *descp = buf; 1807 } 1808 1809 notesize = sizeof(Elf_Note) + /* note header */ 1810 roundup2(sizeof(FREEBSD_ABI_VENDOR), ELF_NOTE_ROUNDSIZE) + 1811 /* note name */ 1812 roundup2(size, ELF_NOTE_ROUNDSIZE); /* note description */ 1813 1814 return (notesize); 1815 } 1816 1817 static void 1818 __elfN(putnote)(struct note_info *ninfo, struct sbuf *sb) 1819 { 1820 Elf_Note note; 1821 ssize_t old_len, sect_len; 1822 size_t new_len, descsz, i; 1823 1824 if (ninfo->type == -1) { 1825 ninfo->outfunc(ninfo->outarg, sb, &ninfo->outsize); 1826 return; 1827 } 1828 1829 note.n_namesz = sizeof(FREEBSD_ABI_VENDOR); 1830 note.n_descsz = ninfo->outsize; 1831 note.n_type = ninfo->type; 1832 1833 sbuf_bcat(sb, ¬e, sizeof(note)); 1834 sbuf_start_section(sb, &old_len); 1835 sbuf_bcat(sb, FREEBSD_ABI_VENDOR, sizeof(FREEBSD_ABI_VENDOR)); 1836 sbuf_end_section(sb, old_len, ELF_NOTE_ROUNDSIZE, 0); 1837 if (note.n_descsz == 0) 1838 return; 1839 sbuf_start_section(sb, &old_len); 1840 ninfo->outfunc(ninfo->outarg, sb, &ninfo->outsize); 1841 sect_len = sbuf_end_section(sb, old_len, ELF_NOTE_ROUNDSIZE, 0); 1842 if (sect_len < 0) 1843 return; 1844 1845 new_len = (size_t)sect_len; 1846 descsz = roundup(note.n_descsz, ELF_NOTE_ROUNDSIZE); 1847 if (new_len < descsz) { 1848 /* 1849 * It is expected that individual note emitters will correctly 1850 * predict their expected output size and fill up to that size 1851 * themselves, padding in a format-specific way if needed. 1852 * However, in case they don't, just do it here with zeros. 1853 */ 1854 for (i = 0; i < descsz - new_len; i++) 1855 sbuf_putc(sb, 0); 1856 } else if (new_len > descsz) { 1857 /* 1858 * We can't always truncate sb -- we may have drained some 1859 * of it already. 1860 */ 1861 KASSERT(new_len == descsz, ("%s: Note type %u changed as we " 1862 "read it (%zu > %zu). Since it is longer than " 1863 "expected, this coredump's notes are corrupt. THIS " 1864 "IS A BUG in the note_procstat routine for type %u.\n", 1865 __func__, (unsigned)note.n_type, new_len, descsz, 1866 (unsigned)note.n_type)); 1867 } 1868 } 1869 1870 /* 1871 * Miscellaneous note out functions. 1872 */ 1873 1874 #if defined(COMPAT_FREEBSD32) && __ELF_WORD_SIZE == 32 1875 #include <compat/freebsd32/freebsd32.h> 1876 #include <compat/freebsd32/freebsd32_signal.h> 1877 1878 typedef struct prstatus32 elf_prstatus_t; 1879 typedef struct prpsinfo32 elf_prpsinfo_t; 1880 typedef struct fpreg32 elf_prfpregset_t; 1881 typedef struct fpreg32 elf_fpregset_t; 1882 typedef struct reg32 elf_gregset_t; 1883 typedef struct thrmisc32 elf_thrmisc_t; 1884 #define ELF_KERN_PROC_MASK KERN_PROC_MASK32 1885 typedef struct kinfo_proc32 elf_kinfo_proc_t; 1886 typedef uint32_t elf_ps_strings_t; 1887 #else 1888 typedef prstatus_t elf_prstatus_t; 1889 typedef prpsinfo_t elf_prpsinfo_t; 1890 typedef prfpregset_t elf_prfpregset_t; 1891 typedef prfpregset_t elf_fpregset_t; 1892 typedef gregset_t elf_gregset_t; 1893 typedef thrmisc_t elf_thrmisc_t; 1894 #define ELF_KERN_PROC_MASK 0 1895 typedef struct kinfo_proc elf_kinfo_proc_t; 1896 typedef vm_offset_t elf_ps_strings_t; 1897 #endif 1898 1899 static void 1900 __elfN(note_prpsinfo)(void *arg, struct sbuf *sb, size_t *sizep) 1901 { 1902 struct sbuf sbarg; 1903 size_t len; 1904 char *cp, *end; 1905 struct proc *p; 1906 elf_prpsinfo_t *psinfo; 1907 int error; 1908 1909 p = (struct proc *)arg; 1910 if (sb != NULL) { 1911 KASSERT(*sizep == sizeof(*psinfo), ("invalid size")); 1912 psinfo = malloc(sizeof(*psinfo), M_TEMP, M_ZERO | M_WAITOK); 1913 psinfo->pr_version = PRPSINFO_VERSION; 1914 psinfo->pr_psinfosz = sizeof(elf_prpsinfo_t); 1915 strlcpy(psinfo->pr_fname, p->p_comm, sizeof(psinfo->pr_fname)); 1916 PROC_LOCK(p); 1917 if (p->p_args != NULL) { 1918 len = sizeof(psinfo->pr_psargs) - 1; 1919 if (len > p->p_args->ar_length) 1920 len = p->p_args->ar_length; 1921 memcpy(psinfo->pr_psargs, p->p_args->ar_args, len); 1922 PROC_UNLOCK(p); 1923 error = 0; 1924 } else { 1925 _PHOLD(p); 1926 PROC_UNLOCK(p); 1927 sbuf_new(&sbarg, psinfo->pr_psargs, 1928 sizeof(psinfo->pr_psargs), SBUF_FIXEDLEN); 1929 error = proc_getargv(curthread, p, &sbarg); 1930 PRELE(p); 1931 if (sbuf_finish(&sbarg) == 0) 1932 len = sbuf_len(&sbarg) - 1; 1933 else 1934 len = sizeof(psinfo->pr_psargs) - 1; 1935 sbuf_delete(&sbarg); 1936 } 1937 if (error || len == 0) 1938 strlcpy(psinfo->pr_psargs, p->p_comm, 1939 sizeof(psinfo->pr_psargs)); 1940 else { 1941 KASSERT(len < sizeof(psinfo->pr_psargs), 1942 ("len is too long: %zu vs %zu", len, 1943 sizeof(psinfo->pr_psargs))); 1944 cp = psinfo->pr_psargs; 1945 end = cp + len - 1; 1946 for (;;) { 1947 cp = memchr(cp, '\0', end - cp); 1948 if (cp == NULL) 1949 break; 1950 *cp = ' '; 1951 } 1952 } 1953 psinfo->pr_pid = p->p_pid; 1954 sbuf_bcat(sb, psinfo, sizeof(*psinfo)); 1955 free(psinfo, M_TEMP); 1956 } 1957 *sizep = sizeof(*psinfo); 1958 } 1959 1960 static void 1961 __elfN(note_prstatus)(void *arg, struct sbuf *sb, size_t *sizep) 1962 { 1963 struct thread *td; 1964 elf_prstatus_t *status; 1965 1966 td = (struct thread *)arg; 1967 if (sb != NULL) { 1968 KASSERT(*sizep == sizeof(*status), ("invalid size")); 1969 status = malloc(sizeof(*status), M_TEMP, M_ZERO | M_WAITOK); 1970 status->pr_version = PRSTATUS_VERSION; 1971 status->pr_statussz = sizeof(elf_prstatus_t); 1972 status->pr_gregsetsz = sizeof(elf_gregset_t); 1973 status->pr_fpregsetsz = sizeof(elf_fpregset_t); 1974 status->pr_osreldate = osreldate; 1975 status->pr_cursig = td->td_proc->p_sig; 1976 status->pr_pid = td->td_tid; 1977 #if defined(COMPAT_FREEBSD32) && __ELF_WORD_SIZE == 32 1978 fill_regs32(td, &status->pr_reg); 1979 #else 1980 fill_regs(td, &status->pr_reg); 1981 #endif 1982 sbuf_bcat(sb, status, sizeof(*status)); 1983 free(status, M_TEMP); 1984 } 1985 *sizep = sizeof(*status); 1986 } 1987 1988 static void 1989 __elfN(note_fpregset)(void *arg, struct sbuf *sb, size_t *sizep) 1990 { 1991 struct thread *td; 1992 elf_prfpregset_t *fpregset; 1993 1994 td = (struct thread *)arg; 1995 if (sb != NULL) { 1996 KASSERT(*sizep == sizeof(*fpregset), ("invalid size")); 1997 fpregset = malloc(sizeof(*fpregset), M_TEMP, M_ZERO | M_WAITOK); 1998 #if defined(COMPAT_FREEBSD32) && __ELF_WORD_SIZE == 32 1999 fill_fpregs32(td, fpregset); 2000 #else 2001 fill_fpregs(td, fpregset); 2002 #endif 2003 sbuf_bcat(sb, fpregset, sizeof(*fpregset)); 2004 free(fpregset, M_TEMP); 2005 } 2006 *sizep = sizeof(*fpregset); 2007 } 2008 2009 static void 2010 __elfN(note_thrmisc)(void *arg, struct sbuf *sb, size_t *sizep) 2011 { 2012 struct thread *td; 2013 elf_thrmisc_t thrmisc; 2014 2015 td = (struct thread *)arg; 2016 if (sb != NULL) { 2017 KASSERT(*sizep == sizeof(thrmisc), ("invalid size")); 2018 bzero(&thrmisc._pad, sizeof(thrmisc._pad)); 2019 strcpy(thrmisc.pr_tname, td->td_name); 2020 sbuf_bcat(sb, &thrmisc, sizeof(thrmisc)); 2021 } 2022 *sizep = sizeof(thrmisc); 2023 } 2024 2025 static void 2026 __elfN(note_ptlwpinfo)(void *arg, struct sbuf *sb, size_t *sizep) 2027 { 2028 struct thread *td; 2029 size_t size; 2030 int structsize; 2031 #if defined(COMPAT_FREEBSD32) && __ELF_WORD_SIZE == 32 2032 struct ptrace_lwpinfo32 pl; 2033 #else 2034 struct ptrace_lwpinfo pl; 2035 #endif 2036 2037 td = (struct thread *)arg; 2038 size = sizeof(structsize) + sizeof(pl); 2039 if (sb != NULL) { 2040 KASSERT(*sizep == size, ("invalid size")); 2041 structsize = sizeof(pl); 2042 sbuf_bcat(sb, &structsize, sizeof(structsize)); 2043 bzero(&pl, sizeof(pl)); 2044 pl.pl_lwpid = td->td_tid; 2045 pl.pl_event = PL_EVENT_NONE; 2046 pl.pl_sigmask = td->td_sigmask; 2047 pl.pl_siglist = td->td_siglist; 2048 if (td->td_si.si_signo != 0) { 2049 pl.pl_event = PL_EVENT_SIGNAL; 2050 pl.pl_flags |= PL_FLAG_SI; 2051 #if defined(COMPAT_FREEBSD32) && __ELF_WORD_SIZE == 32 2052 siginfo_to_siginfo32(&td->td_si, &pl.pl_siginfo); 2053 #else 2054 pl.pl_siginfo = td->td_si; 2055 #endif 2056 } 2057 strcpy(pl.pl_tdname, td->td_name); 2058 /* XXX TODO: supply more information in struct ptrace_lwpinfo*/ 2059 sbuf_bcat(sb, &pl, sizeof(pl)); 2060 } 2061 *sizep = size; 2062 } 2063 2064 /* 2065 * Allow for MD specific notes, as well as any MD 2066 * specific preparations for writing MI notes. 2067 */ 2068 static void 2069 __elfN(note_threadmd)(void *arg, struct sbuf *sb, size_t *sizep) 2070 { 2071 struct thread *td; 2072 void *buf; 2073 size_t size; 2074 2075 td = (struct thread *)arg; 2076 size = *sizep; 2077 if (size != 0 && sb != NULL) 2078 buf = malloc(size, M_TEMP, M_ZERO | M_WAITOK); 2079 else 2080 buf = NULL; 2081 size = 0; 2082 __elfN(dump_thread)(td, buf, &size); 2083 KASSERT(sb == NULL || *sizep == size, ("invalid size")); 2084 if (size != 0 && sb != NULL) 2085 sbuf_bcat(sb, buf, size); 2086 free(buf, M_TEMP); 2087 *sizep = size; 2088 } 2089 2090 #ifdef KINFO_PROC_SIZE 2091 CTASSERT(sizeof(struct kinfo_proc) == KINFO_PROC_SIZE); 2092 #endif 2093 2094 static void 2095 __elfN(note_procstat_proc)(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) + p->p_numthreads * 2103 sizeof(elf_kinfo_proc_t); 2104 2105 if (sb != NULL) { 2106 KASSERT(*sizep == size, ("invalid size")); 2107 structsize = sizeof(elf_kinfo_proc_t); 2108 sbuf_bcat(sb, &structsize, sizeof(structsize)); 2109 sx_slock(&proctree_lock); 2110 PROC_LOCK(p); 2111 kern_proc_out(p, sb, ELF_KERN_PROC_MASK); 2112 sx_sunlock(&proctree_lock); 2113 } 2114 *sizep = size; 2115 } 2116 2117 #ifdef KINFO_FILE_SIZE 2118 CTASSERT(sizeof(struct kinfo_file) == KINFO_FILE_SIZE); 2119 #endif 2120 2121 static void 2122 note_procstat_files(void *arg, struct sbuf *sb, size_t *sizep) 2123 { 2124 struct proc *p; 2125 size_t size, sect_sz, i; 2126 ssize_t start_len, sect_len; 2127 int structsize, filedesc_flags; 2128 2129 if (coredump_pack_fileinfo) 2130 filedesc_flags = KERN_FILEDESC_PACK_KINFO; 2131 else 2132 filedesc_flags = 0; 2133 2134 p = (struct proc *)arg; 2135 structsize = sizeof(struct kinfo_file); 2136 if (sb == NULL) { 2137 size = 0; 2138 sb = sbuf_new(NULL, NULL, 128, SBUF_FIXEDLEN); 2139 sbuf_set_drain(sb, sbuf_drain_count, &size); 2140 sbuf_bcat(sb, &structsize, sizeof(structsize)); 2141 PROC_LOCK(p); 2142 kern_proc_filedesc_out(p, sb, -1, filedesc_flags); 2143 sbuf_finish(sb); 2144 sbuf_delete(sb); 2145 *sizep = size; 2146 } else { 2147 sbuf_start_section(sb, &start_len); 2148 2149 sbuf_bcat(sb, &structsize, sizeof(structsize)); 2150 PROC_LOCK(p); 2151 kern_proc_filedesc_out(p, sb, *sizep - sizeof(structsize), 2152 filedesc_flags); 2153 2154 sect_len = sbuf_end_section(sb, start_len, 0, 0); 2155 if (sect_len < 0) 2156 return; 2157 sect_sz = sect_len; 2158 2159 KASSERT(sect_sz <= *sizep, 2160 ("kern_proc_filedesc_out did not respect maxlen; " 2161 "requested %zu, got %zu", *sizep - sizeof(structsize), 2162 sect_sz - sizeof(structsize))); 2163 2164 for (i = 0; i < *sizep - sect_sz && sb->s_error == 0; i++) 2165 sbuf_putc(sb, 0); 2166 } 2167 } 2168 2169 #ifdef KINFO_VMENTRY_SIZE 2170 CTASSERT(sizeof(struct kinfo_vmentry) == KINFO_VMENTRY_SIZE); 2171 #endif 2172 2173 static void 2174 note_procstat_vmmap(void *arg, struct sbuf *sb, size_t *sizep) 2175 { 2176 struct proc *p; 2177 size_t size; 2178 int structsize, vmmap_flags; 2179 2180 if (coredump_pack_vmmapinfo) 2181 vmmap_flags = KERN_VMMAP_PACK_KINFO; 2182 else 2183 vmmap_flags = 0; 2184 2185 p = (struct proc *)arg; 2186 structsize = sizeof(struct kinfo_vmentry); 2187 if (sb == NULL) { 2188 size = 0; 2189 sb = sbuf_new(NULL, NULL, 128, SBUF_FIXEDLEN); 2190 sbuf_set_drain(sb, sbuf_drain_count, &size); 2191 sbuf_bcat(sb, &structsize, sizeof(structsize)); 2192 PROC_LOCK(p); 2193 kern_proc_vmmap_out(p, sb, -1, vmmap_flags); 2194 sbuf_finish(sb); 2195 sbuf_delete(sb); 2196 *sizep = size; 2197 } else { 2198 sbuf_bcat(sb, &structsize, sizeof(structsize)); 2199 PROC_LOCK(p); 2200 kern_proc_vmmap_out(p, sb, *sizep - sizeof(structsize), 2201 vmmap_flags); 2202 } 2203 } 2204 2205 static void 2206 note_procstat_groups(void *arg, struct sbuf *sb, size_t *sizep) 2207 { 2208 struct proc *p; 2209 size_t size; 2210 int structsize; 2211 2212 p = (struct proc *)arg; 2213 size = sizeof(structsize) + p->p_ucred->cr_ngroups * sizeof(gid_t); 2214 if (sb != NULL) { 2215 KASSERT(*sizep == size, ("invalid size")); 2216 structsize = sizeof(gid_t); 2217 sbuf_bcat(sb, &structsize, sizeof(structsize)); 2218 sbuf_bcat(sb, p->p_ucred->cr_groups, p->p_ucred->cr_ngroups * 2219 sizeof(gid_t)); 2220 } 2221 *sizep = size; 2222 } 2223 2224 static void 2225 note_procstat_umask(void *arg, struct sbuf *sb, size_t *sizep) 2226 { 2227 struct proc *p; 2228 size_t size; 2229 int structsize; 2230 2231 p = (struct proc *)arg; 2232 size = sizeof(structsize) + sizeof(p->p_fd->fd_cmask); 2233 if (sb != NULL) { 2234 KASSERT(*sizep == size, ("invalid size")); 2235 structsize = sizeof(p->p_fd->fd_cmask); 2236 sbuf_bcat(sb, &structsize, sizeof(structsize)); 2237 sbuf_bcat(sb, &p->p_fd->fd_cmask, sizeof(p->p_fd->fd_cmask)); 2238 } 2239 *sizep = size; 2240 } 2241 2242 static void 2243 note_procstat_rlimit(void *arg, struct sbuf *sb, size_t *sizep) 2244 { 2245 struct proc *p; 2246 struct rlimit rlim[RLIM_NLIMITS]; 2247 size_t size; 2248 int structsize, i; 2249 2250 p = (struct proc *)arg; 2251 size = sizeof(structsize) + sizeof(rlim); 2252 if (sb != NULL) { 2253 KASSERT(*sizep == size, ("invalid size")); 2254 structsize = sizeof(rlim); 2255 sbuf_bcat(sb, &structsize, sizeof(structsize)); 2256 PROC_LOCK(p); 2257 for (i = 0; i < RLIM_NLIMITS; i++) 2258 lim_rlimit_proc(p, i, &rlim[i]); 2259 PROC_UNLOCK(p); 2260 sbuf_bcat(sb, rlim, sizeof(rlim)); 2261 } 2262 *sizep = size; 2263 } 2264 2265 static void 2266 note_procstat_osrel(void *arg, struct sbuf *sb, size_t *sizep) 2267 { 2268 struct proc *p; 2269 size_t size; 2270 int structsize; 2271 2272 p = (struct proc *)arg; 2273 size = sizeof(structsize) + sizeof(p->p_osrel); 2274 if (sb != NULL) { 2275 KASSERT(*sizep == size, ("invalid size")); 2276 structsize = sizeof(p->p_osrel); 2277 sbuf_bcat(sb, &structsize, sizeof(structsize)); 2278 sbuf_bcat(sb, &p->p_osrel, sizeof(p->p_osrel)); 2279 } 2280 *sizep = size; 2281 } 2282 2283 static void 2284 __elfN(note_procstat_psstrings)(void *arg, struct sbuf *sb, size_t *sizep) 2285 { 2286 struct proc *p; 2287 elf_ps_strings_t ps_strings; 2288 size_t size; 2289 int structsize; 2290 2291 p = (struct proc *)arg; 2292 size = sizeof(structsize) + sizeof(ps_strings); 2293 if (sb != NULL) { 2294 KASSERT(*sizep == size, ("invalid size")); 2295 structsize = sizeof(ps_strings); 2296 #if defined(COMPAT_FREEBSD32) && __ELF_WORD_SIZE == 32 2297 ps_strings = PTROUT(p->p_sysent->sv_psstrings); 2298 #else 2299 ps_strings = p->p_sysent->sv_psstrings; 2300 #endif 2301 sbuf_bcat(sb, &structsize, sizeof(structsize)); 2302 sbuf_bcat(sb, &ps_strings, sizeof(ps_strings)); 2303 } 2304 *sizep = size; 2305 } 2306 2307 static void 2308 __elfN(note_procstat_auxv)(void *arg, struct sbuf *sb, size_t *sizep) 2309 { 2310 struct proc *p; 2311 size_t size; 2312 int structsize; 2313 2314 p = (struct proc *)arg; 2315 if (sb == NULL) { 2316 size = 0; 2317 sb = sbuf_new(NULL, NULL, 128, SBUF_FIXEDLEN); 2318 sbuf_set_drain(sb, sbuf_drain_count, &size); 2319 sbuf_bcat(sb, &structsize, sizeof(structsize)); 2320 PHOLD(p); 2321 proc_getauxv(curthread, p, sb); 2322 PRELE(p); 2323 sbuf_finish(sb); 2324 sbuf_delete(sb); 2325 *sizep = size; 2326 } else { 2327 structsize = sizeof(Elf_Auxinfo); 2328 sbuf_bcat(sb, &structsize, sizeof(structsize)); 2329 PHOLD(p); 2330 proc_getauxv(curthread, p, sb); 2331 PRELE(p); 2332 } 2333 } 2334 2335 static boolean_t 2336 __elfN(parse_notes)(struct image_params *imgp, Elf_Brandnote *checknote, 2337 int32_t *osrel, const Elf_Phdr *pnote) 2338 { 2339 const Elf_Note *note, *note0, *note_end; 2340 const char *note_name; 2341 char *buf; 2342 int i, error; 2343 boolean_t res; 2344 2345 /* We need some limit, might as well use PAGE_SIZE. */ 2346 if (pnote == NULL || pnote->p_filesz > PAGE_SIZE) 2347 return (FALSE); 2348 ASSERT_VOP_LOCKED(imgp->vp, "parse_notes"); 2349 if (pnote->p_offset > PAGE_SIZE || 2350 pnote->p_filesz > PAGE_SIZE - pnote->p_offset) { 2351 VOP_UNLOCK(imgp->vp, 0); 2352 buf = malloc(pnote->p_filesz, M_TEMP, M_WAITOK); 2353 vn_lock(imgp->vp, LK_EXCLUSIVE | LK_RETRY); 2354 error = vn_rdwr(UIO_READ, imgp->vp, buf, pnote->p_filesz, 2355 pnote->p_offset, UIO_SYSSPACE, IO_NODELOCKED, 2356 curthread->td_ucred, NOCRED, NULL, curthread); 2357 if (error != 0) { 2358 uprintf("i/o error PT_NOTE\n"); 2359 res = FALSE; 2360 goto ret; 2361 } 2362 note = note0 = (const Elf_Note *)buf; 2363 note_end = (const Elf_Note *)(buf + pnote->p_filesz); 2364 } else { 2365 note = note0 = (const Elf_Note *)(imgp->image_header + 2366 pnote->p_offset); 2367 note_end = (const Elf_Note *)(imgp->image_header + 2368 pnote->p_offset + pnote->p_filesz); 2369 buf = NULL; 2370 } 2371 for (i = 0; i < 100 && note >= note0 && note < note_end; i++) { 2372 if (!aligned(note, Elf32_Addr) || (const char *)note_end - 2373 (const char *)note < sizeof(Elf_Note)) { 2374 res = FALSE; 2375 goto ret; 2376 } 2377 if (note->n_namesz != checknote->hdr.n_namesz || 2378 note->n_descsz != checknote->hdr.n_descsz || 2379 note->n_type != checknote->hdr.n_type) 2380 goto nextnote; 2381 note_name = (const char *)(note + 1); 2382 if (note_name + checknote->hdr.n_namesz >= 2383 (const char *)note_end || strncmp(checknote->vendor, 2384 note_name, checknote->hdr.n_namesz) != 0) 2385 goto nextnote; 2386 2387 /* 2388 * Fetch the osreldate for binary 2389 * from the ELF OSABI-note if necessary. 2390 */ 2391 if ((checknote->flags & BN_TRANSLATE_OSREL) != 0 && 2392 checknote->trans_osrel != NULL) { 2393 res = checknote->trans_osrel(note, osrel); 2394 goto ret; 2395 } 2396 res = TRUE; 2397 goto ret; 2398 nextnote: 2399 note = (const Elf_Note *)((const char *)(note + 1) + 2400 roundup2(note->n_namesz, ELF_NOTE_ROUNDSIZE) + 2401 roundup2(note->n_descsz, ELF_NOTE_ROUNDSIZE)); 2402 } 2403 res = FALSE; 2404 ret: 2405 free(buf, M_TEMP); 2406 return (res); 2407 } 2408 2409 /* 2410 * Try to find the appropriate ABI-note section for checknote, 2411 * fetch the osreldate for binary from the ELF OSABI-note. Only the 2412 * first page of the image is searched, the same as for headers. 2413 */ 2414 static boolean_t 2415 __elfN(check_note)(struct image_params *imgp, Elf_Brandnote *checknote, 2416 int32_t *osrel) 2417 { 2418 const Elf_Phdr *phdr; 2419 const Elf_Ehdr *hdr; 2420 int i; 2421 2422 hdr = (const Elf_Ehdr *)imgp->image_header; 2423 phdr = (const Elf_Phdr *)(imgp->image_header + hdr->e_phoff); 2424 2425 for (i = 0; i < hdr->e_phnum; i++) { 2426 if (phdr[i].p_type == PT_NOTE && 2427 __elfN(parse_notes)(imgp, checknote, osrel, &phdr[i])) 2428 return (TRUE); 2429 } 2430 return (FALSE); 2431 2432 } 2433 2434 /* 2435 * Tell kern_execve.c about it, with a little help from the linker. 2436 */ 2437 static struct execsw __elfN(execsw) = { 2438 .ex_imgact = __CONCAT(exec_, __elfN(imgact)), 2439 .ex_name = __XSTRING(__CONCAT(ELF, __ELF_WORD_SIZE)) 2440 }; 2441 EXEC_SET(__CONCAT(elf, __ELF_WORD_SIZE), __elfN(execsw)); 2442 2443 static vm_prot_t 2444 __elfN(trans_prot)(Elf_Word flags) 2445 { 2446 vm_prot_t prot; 2447 2448 prot = 0; 2449 if (flags & PF_X) 2450 prot |= VM_PROT_EXECUTE; 2451 if (flags & PF_W) 2452 prot |= VM_PROT_WRITE; 2453 if (flags & PF_R) 2454 prot |= VM_PROT_READ; 2455 #if __ELF_WORD_SIZE == 32 2456 #if defined(__amd64__) 2457 if (i386_read_exec && (flags & PF_R)) 2458 prot |= VM_PROT_EXECUTE; 2459 #endif 2460 #endif 2461 return (prot); 2462 } 2463 2464 static Elf_Word 2465 __elfN(untrans_prot)(vm_prot_t prot) 2466 { 2467 Elf_Word flags; 2468 2469 flags = 0; 2470 if (prot & VM_PROT_EXECUTE) 2471 flags |= PF_X; 2472 if (prot & VM_PROT_READ) 2473 flags |= PF_R; 2474 if (prot & VM_PROT_WRITE) 2475 flags |= PF_W; 2476 return (flags); 2477 } 2478