1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 2017 Dell EMC 5 * Copyright (c) 2000-2001, 2003 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 defined(__riscv) 125 1; 126 #else 127 0; 128 #endif 129 SYSCTL_INT(__CONCAT(_kern_elf, __ELF_WORD_SIZE), OID_AUTO, 130 nxstack, CTLFLAG_RW, &__elfN(nxstack), 0, 131 __XSTRING(__CONCAT(ELF, __ELF_WORD_SIZE)) ": enable non-executable stack"); 132 133 #if __ELF_WORD_SIZE == 32 134 #if defined(__amd64__) 135 int i386_read_exec = 0; 136 SYSCTL_INT(_kern_elf32, OID_AUTO, read_exec, CTLFLAG_RW, &i386_read_exec, 0, 137 "enable execution from readable segments"); 138 #endif 139 #endif 140 141 static Elf_Brandinfo *elf_brand_list[MAX_BRANDS]; 142 143 #define trunc_page_ps(va, ps) rounddown2(va, ps) 144 #define round_page_ps(va, ps) roundup2(va, ps) 145 #define aligned(a, t) (trunc_page_ps((u_long)(a), sizeof(t)) == (u_long)(a)) 146 147 static const char FREEBSD_ABI_VENDOR[] = "FreeBSD"; 148 149 Elf_Brandnote __elfN(freebsd_brandnote) = { 150 .hdr.n_namesz = sizeof(FREEBSD_ABI_VENDOR), 151 .hdr.n_descsz = sizeof(int32_t), 152 .hdr.n_type = NT_FREEBSD_ABI_TAG, 153 .vendor = FREEBSD_ABI_VENDOR, 154 .flags = BN_TRANSLATE_OSREL, 155 .trans_osrel = __elfN(freebsd_trans_osrel) 156 }; 157 158 static bool 159 __elfN(freebsd_trans_osrel)(const Elf_Note *note, int32_t *osrel) 160 { 161 uintptr_t p; 162 163 p = (uintptr_t)(note + 1); 164 p += roundup2(note->n_namesz, ELF_NOTE_ROUNDSIZE); 165 *osrel = *(const int32_t *)(p); 166 167 return (true); 168 } 169 170 static const char GNU_ABI_VENDOR[] = "GNU"; 171 static int GNU_KFREEBSD_ABI_DESC = 3; 172 173 Elf_Brandnote __elfN(kfreebsd_brandnote) = { 174 .hdr.n_namesz = sizeof(GNU_ABI_VENDOR), 175 .hdr.n_descsz = 16, /* XXX at least 16 */ 176 .hdr.n_type = 1, 177 .vendor = GNU_ABI_VENDOR, 178 .flags = BN_TRANSLATE_OSREL, 179 .trans_osrel = kfreebsd_trans_osrel 180 }; 181 182 static bool 183 kfreebsd_trans_osrel(const Elf_Note *note, int32_t *osrel) 184 { 185 const Elf32_Word *desc; 186 uintptr_t p; 187 188 p = (uintptr_t)(note + 1); 189 p += roundup2(note->n_namesz, ELF_NOTE_ROUNDSIZE); 190 191 desc = (const Elf32_Word *)p; 192 if (desc[0] != GNU_KFREEBSD_ABI_DESC) 193 return (false); 194 195 /* 196 * Debian GNU/kFreeBSD embed the earliest compatible kernel version 197 * (__FreeBSD_version: <major><two digit minor>Rxx) in the LSB way. 198 */ 199 *osrel = desc[1] * 100000 + desc[2] * 1000 + desc[3]; 200 201 return (true); 202 } 203 204 int 205 __elfN(insert_brand_entry)(Elf_Brandinfo *entry) 206 { 207 int i; 208 209 for (i = 0; i < MAX_BRANDS; i++) { 210 if (elf_brand_list[i] == NULL) { 211 elf_brand_list[i] = entry; 212 break; 213 } 214 } 215 if (i == MAX_BRANDS) { 216 printf("WARNING: %s: could not insert brandinfo entry: %p\n", 217 __func__, entry); 218 return (-1); 219 } 220 return (0); 221 } 222 223 int 224 __elfN(remove_brand_entry)(Elf_Brandinfo *entry) 225 { 226 int i; 227 228 for (i = 0; i < MAX_BRANDS; i++) { 229 if (elf_brand_list[i] == entry) { 230 elf_brand_list[i] = NULL; 231 break; 232 } 233 } 234 if (i == MAX_BRANDS) 235 return (-1); 236 return (0); 237 } 238 239 int 240 __elfN(brand_inuse)(Elf_Brandinfo *entry) 241 { 242 struct proc *p; 243 int rval = FALSE; 244 245 sx_slock(&allproc_lock); 246 FOREACH_PROC_IN_SYSTEM(p) { 247 if (p->p_sysent == entry->sysvec) { 248 rval = TRUE; 249 break; 250 } 251 } 252 sx_sunlock(&allproc_lock); 253 254 return (rval); 255 } 256 257 static Elf_Brandinfo * 258 __elfN(get_brandinfo)(struct image_params *imgp, const char *interp, 259 int interp_name_len, int32_t *osrel) 260 { 261 const Elf_Ehdr *hdr = (const Elf_Ehdr *)imgp->image_header; 262 Elf_Brandinfo *bi, *bi_m; 263 boolean_t ret; 264 int i; 265 266 /* 267 * We support four types of branding -- (1) the ELF EI_OSABI field 268 * that SCO added to the ELF spec, (2) FreeBSD 3.x's traditional string 269 * branding w/in the ELF header, (3) path of the `interp_path' 270 * field, and (4) the ".note.ABI-tag" ELF section. 271 */ 272 273 /* Look for an ".note.ABI-tag" ELF section */ 274 bi_m = NULL; 275 for (i = 0; i < MAX_BRANDS; i++) { 276 bi = elf_brand_list[i]; 277 if (bi == NULL) 278 continue; 279 if (interp != NULL && (bi->flags & BI_BRAND_ONLY_STATIC) != 0) 280 continue; 281 if (hdr->e_machine == bi->machine && (bi->flags & 282 (BI_BRAND_NOTE|BI_BRAND_NOTE_MANDATORY)) != 0) { 283 ret = __elfN(check_note)(imgp, bi->brand_note, osrel); 284 /* Give brand a chance to veto check_note's guess */ 285 if (ret && bi->header_supported) 286 ret = bi->header_supported(imgp); 287 /* 288 * If note checker claimed the binary, but the 289 * interpreter path in the image does not 290 * match default one for the brand, try to 291 * search for other brands with the same 292 * interpreter. Either there is better brand 293 * with the right interpreter, or, failing 294 * this, we return first brand which accepted 295 * our note and, optionally, header. 296 */ 297 if (ret && bi_m == NULL && interp != NULL && 298 (bi->interp_path == NULL || 299 (strlen(bi->interp_path) + 1 != interp_name_len || 300 strncmp(interp, bi->interp_path, interp_name_len) 301 != 0))) { 302 bi_m = bi; 303 ret = 0; 304 } 305 if (ret) 306 return (bi); 307 } 308 } 309 if (bi_m != NULL) 310 return (bi_m); 311 312 /* If the executable has a brand, search for it in the brand list. */ 313 for (i = 0; i < MAX_BRANDS; i++) { 314 bi = elf_brand_list[i]; 315 if (bi == NULL || (bi->flags & BI_BRAND_NOTE_MANDATORY) != 0 || 316 (interp != NULL && (bi->flags & BI_BRAND_ONLY_STATIC) != 0)) 317 continue; 318 if (hdr->e_machine == bi->machine && 319 (hdr->e_ident[EI_OSABI] == bi->brand || 320 (bi->compat_3_brand != NULL && 321 strcmp((const char *)&hdr->e_ident[OLD_EI_BRAND], 322 bi->compat_3_brand) == 0))) { 323 /* Looks good, but give brand a chance to veto */ 324 if (bi->header_supported == NULL || 325 bi->header_supported(imgp)) { 326 /* 327 * Again, prefer strictly matching 328 * interpreter path. 329 */ 330 if (interp_name_len == 0 && 331 bi->interp_path == NULL) 332 return (bi); 333 if (bi->interp_path != NULL && 334 strlen(bi->interp_path) + 1 == 335 interp_name_len && strncmp(interp, 336 bi->interp_path, interp_name_len) == 0) 337 return (bi); 338 if (bi_m == NULL) 339 bi_m = bi; 340 } 341 } 342 } 343 if (bi_m != NULL) 344 return (bi_m); 345 346 /* No known brand, see if the header is recognized by any brand */ 347 for (i = 0; i < MAX_BRANDS; i++) { 348 bi = elf_brand_list[i]; 349 if (bi == NULL || bi->flags & BI_BRAND_NOTE_MANDATORY || 350 bi->header_supported == NULL) 351 continue; 352 if (hdr->e_machine == bi->machine) { 353 ret = bi->header_supported(imgp); 354 if (ret) 355 return (bi); 356 } 357 } 358 359 /* Lacking a known brand, search for a recognized interpreter. */ 360 if (interp != NULL) { 361 for (i = 0; i < MAX_BRANDS; i++) { 362 bi = elf_brand_list[i]; 363 if (bi == NULL || (bi->flags & 364 (BI_BRAND_NOTE_MANDATORY | BI_BRAND_ONLY_STATIC)) 365 != 0) 366 continue; 367 if (hdr->e_machine == bi->machine && 368 bi->interp_path != NULL && 369 /* ELF image p_filesz includes terminating zero */ 370 strlen(bi->interp_path) + 1 == interp_name_len && 371 strncmp(interp, bi->interp_path, interp_name_len) 372 == 0 && (bi->header_supported == NULL || 373 bi->header_supported(imgp))) 374 return (bi); 375 } 376 } 377 378 /* Lacking a recognized interpreter, try the default brand */ 379 for (i = 0; i < MAX_BRANDS; i++) { 380 bi = elf_brand_list[i]; 381 if (bi == NULL || (bi->flags & BI_BRAND_NOTE_MANDATORY) != 0 || 382 (interp != NULL && (bi->flags & BI_BRAND_ONLY_STATIC) != 0)) 383 continue; 384 if (hdr->e_machine == bi->machine && 385 __elfN(fallback_brand) == bi->brand && 386 (bi->header_supported == NULL || 387 bi->header_supported(imgp))) 388 return (bi); 389 } 390 return (NULL); 391 } 392 393 static int 394 __elfN(check_header)(const Elf_Ehdr *hdr) 395 { 396 Elf_Brandinfo *bi; 397 int i; 398 399 if (!IS_ELF(*hdr) || 400 hdr->e_ident[EI_CLASS] != ELF_TARG_CLASS || 401 hdr->e_ident[EI_DATA] != ELF_TARG_DATA || 402 hdr->e_ident[EI_VERSION] != EV_CURRENT || 403 hdr->e_phentsize != sizeof(Elf_Phdr) || 404 hdr->e_version != ELF_TARG_VER) 405 return (ENOEXEC); 406 407 /* 408 * Make sure we have at least one brand for this machine. 409 */ 410 411 for (i = 0; i < MAX_BRANDS; i++) { 412 bi = elf_brand_list[i]; 413 if (bi != NULL && bi->machine == hdr->e_machine) 414 break; 415 } 416 if (i == MAX_BRANDS) 417 return (ENOEXEC); 418 419 return (0); 420 } 421 422 static int 423 __elfN(map_partial)(vm_map_t map, vm_object_t object, vm_ooffset_t offset, 424 vm_offset_t start, vm_offset_t end, vm_prot_t prot) 425 { 426 struct sf_buf *sf; 427 int error; 428 vm_offset_t off; 429 430 /* 431 * Create the page if it doesn't exist yet. Ignore errors. 432 */ 433 vm_map_fixed(map, NULL, 0, trunc_page(start), round_page(end) - 434 trunc_page(start), VM_PROT_ALL, VM_PROT_ALL, MAP_CHECK_EXCL); 435 436 /* 437 * Find the page from the underlying object. 438 */ 439 if (object != NULL) { 440 sf = vm_imgact_map_page(object, offset); 441 if (sf == NULL) 442 return (KERN_FAILURE); 443 off = offset - trunc_page(offset); 444 error = copyout((caddr_t)sf_buf_kva(sf) + off, (caddr_t)start, 445 end - start); 446 vm_imgact_unmap_page(sf); 447 if (error != 0) 448 return (KERN_FAILURE); 449 } 450 451 return (KERN_SUCCESS); 452 } 453 454 static int 455 __elfN(map_insert)(struct image_params *imgp, vm_map_t map, vm_object_t object, 456 vm_ooffset_t offset, vm_offset_t start, vm_offset_t end, vm_prot_t prot, 457 int cow) 458 { 459 struct sf_buf *sf; 460 vm_offset_t off; 461 vm_size_t sz; 462 int error, locked, rv; 463 464 if (start != trunc_page(start)) { 465 rv = __elfN(map_partial)(map, object, offset, start, 466 round_page(start), prot); 467 if (rv != KERN_SUCCESS) 468 return (rv); 469 offset += round_page(start) - start; 470 start = round_page(start); 471 } 472 if (end != round_page(end)) { 473 rv = __elfN(map_partial)(map, object, offset + 474 trunc_page(end) - start, trunc_page(end), end, prot); 475 if (rv != KERN_SUCCESS) 476 return (rv); 477 end = trunc_page(end); 478 } 479 if (start >= end) 480 return (KERN_SUCCESS); 481 if ((offset & PAGE_MASK) != 0) { 482 /* 483 * The mapping is not page aligned. This means that we have 484 * to copy the data. 485 */ 486 rv = vm_map_fixed(map, NULL, 0, start, end - start, 487 prot | VM_PROT_WRITE, VM_PROT_ALL, MAP_CHECK_EXCL); 488 if (rv != KERN_SUCCESS) 489 return (rv); 490 if (object == NULL) 491 return (KERN_SUCCESS); 492 for (; start < end; start += sz) { 493 sf = vm_imgact_map_page(object, offset); 494 if (sf == NULL) 495 return (KERN_FAILURE); 496 off = offset - trunc_page(offset); 497 sz = end - start; 498 if (sz > PAGE_SIZE - off) 499 sz = PAGE_SIZE - off; 500 error = copyout((caddr_t)sf_buf_kva(sf) + off, 501 (caddr_t)start, sz); 502 vm_imgact_unmap_page(sf); 503 if (error != 0) 504 return (KERN_FAILURE); 505 offset += sz; 506 } 507 } else { 508 vm_object_reference(object); 509 rv = vm_map_fixed(map, object, offset, start, end - start, 510 prot, VM_PROT_ALL, cow | MAP_CHECK_EXCL); 511 if (rv != KERN_SUCCESS) { 512 locked = VOP_ISLOCKED(imgp->vp); 513 VOP_UNLOCK(imgp->vp, 0); 514 vm_object_deallocate(object); 515 vn_lock(imgp->vp, locked | LK_RETRY); 516 return (rv); 517 } 518 } 519 return (KERN_SUCCESS); 520 } 521 522 static int 523 __elfN(load_section)(struct image_params *imgp, vm_ooffset_t offset, 524 caddr_t vmaddr, size_t memsz, size_t filsz, vm_prot_t prot, 525 size_t pagesize) 526 { 527 struct sf_buf *sf; 528 size_t map_len; 529 vm_map_t map; 530 vm_object_t object; 531 vm_offset_t off, map_addr; 532 int error, rv, cow; 533 size_t copy_len; 534 vm_ooffset_t file_addr; 535 536 /* 537 * It's necessary to fail if the filsz + offset taken from the 538 * header is greater than the actual file pager object's size. 539 * If we were to allow this, then the vm_map_find() below would 540 * walk right off the end of the file object and into the ether. 541 * 542 * While I'm here, might as well check for something else that 543 * is invalid: filsz cannot be greater than memsz. 544 */ 545 if ((filsz != 0 && (off_t)filsz + offset > imgp->attr->va_size) || 546 filsz > memsz) { 547 uprintf("elf_load_section: truncated ELF file\n"); 548 return (ENOEXEC); 549 } 550 551 object = imgp->object; 552 map = &imgp->proc->p_vmspace->vm_map; 553 map_addr = trunc_page_ps((vm_offset_t)vmaddr, pagesize); 554 file_addr = trunc_page_ps(offset, pagesize); 555 556 /* 557 * We have two choices. We can either clear the data in the last page 558 * of an oversized mapping, or we can start the anon mapping a page 559 * early and copy the initialized data into that first page. We 560 * choose the second. 561 */ 562 if (filsz == 0) 563 map_len = 0; 564 else if (memsz > filsz) 565 map_len = trunc_page_ps(offset + filsz, pagesize) - file_addr; 566 else 567 map_len = round_page_ps(offset + filsz, pagesize) - file_addr; 568 569 if (map_len != 0) { 570 /* cow flags: don't dump readonly sections in core */ 571 cow = MAP_COPY_ON_WRITE | MAP_PREFAULT | 572 (prot & VM_PROT_WRITE ? 0 : MAP_DISABLE_COREDUMP); 573 574 rv = __elfN(map_insert)(imgp, map, 575 object, 576 file_addr, /* file offset */ 577 map_addr, /* virtual start */ 578 map_addr + map_len,/* virtual end */ 579 prot, 580 cow); 581 if (rv != KERN_SUCCESS) 582 return (EINVAL); 583 584 /* we can stop now if we've covered it all */ 585 if (memsz == filsz) 586 return (0); 587 } 588 589 590 /* 591 * We have to get the remaining bit of the file into the first part 592 * of the oversized map segment. This is normally because the .data 593 * segment in the file is extended to provide bss. It's a neat idea 594 * to try and save a page, but it's a pain in the behind to implement. 595 */ 596 copy_len = filsz == 0 ? 0 : (offset + filsz) - trunc_page_ps(offset + 597 filsz, pagesize); 598 map_addr = trunc_page_ps((vm_offset_t)vmaddr + filsz, pagesize); 599 map_len = round_page_ps((vm_offset_t)vmaddr + memsz, pagesize) - 600 map_addr; 601 602 /* This had damn well better be true! */ 603 if (map_len != 0) { 604 rv = __elfN(map_insert)(imgp, map, NULL, 0, map_addr, 605 map_addr + map_len, prot, 0); 606 if (rv != KERN_SUCCESS) 607 return (EINVAL); 608 } 609 610 if (copy_len != 0) { 611 sf = vm_imgact_map_page(object, offset + filsz); 612 if (sf == NULL) 613 return (EIO); 614 615 /* send the page fragment to user space */ 616 off = trunc_page_ps(offset + filsz, pagesize) - 617 trunc_page(offset + filsz); 618 error = copyout((caddr_t)sf_buf_kva(sf) + off, 619 (caddr_t)map_addr, copy_len); 620 vm_imgact_unmap_page(sf); 621 if (error != 0) 622 return (error); 623 } 624 625 /* 626 * Remove write access to the page if it was only granted by map_insert 627 * to allow copyout. 628 */ 629 if ((prot & VM_PROT_WRITE) == 0) 630 vm_map_protect(map, trunc_page(map_addr), round_page(map_addr + 631 map_len), prot, FALSE); 632 633 return (0); 634 } 635 636 /* 637 * Load the file "file" into memory. It may be either a shared object 638 * or an executable. 639 * 640 * The "addr" reference parameter is in/out. On entry, it specifies 641 * the address where a shared object should be loaded. If the file is 642 * an executable, this value is ignored. On exit, "addr" specifies 643 * where the file was actually loaded. 644 * 645 * The "entry" reference parameter is out only. On exit, it specifies 646 * the entry point for the loaded file. 647 */ 648 static int 649 __elfN(load_file)(struct proc *p, const char *file, u_long *addr, 650 u_long *entry, size_t pagesize) 651 { 652 struct { 653 struct nameidata nd; 654 struct vattr attr; 655 struct image_params image_params; 656 } *tempdata; 657 const Elf_Ehdr *hdr = NULL; 658 const Elf_Phdr *phdr = NULL; 659 struct nameidata *nd; 660 struct vattr *attr; 661 struct image_params *imgp; 662 vm_prot_t prot; 663 u_long rbase; 664 u_long base_addr = 0; 665 int error, i, numsegs; 666 667 #ifdef CAPABILITY_MODE 668 /* 669 * XXXJA: This check can go away once we are sufficiently confident 670 * that the checks in namei() are correct. 671 */ 672 if (IN_CAPABILITY_MODE(curthread)) 673 return (ECAPMODE); 674 #endif 675 676 tempdata = malloc(sizeof(*tempdata), M_TEMP, M_WAITOK); 677 nd = &tempdata->nd; 678 attr = &tempdata->attr; 679 imgp = &tempdata->image_params; 680 681 /* 682 * Initialize part of the common data 683 */ 684 imgp->proc = p; 685 imgp->attr = attr; 686 imgp->firstpage = NULL; 687 imgp->image_header = NULL; 688 imgp->object = NULL; 689 imgp->execlabel = NULL; 690 691 NDINIT(nd, LOOKUP, LOCKLEAF | FOLLOW, UIO_SYSSPACE, file, curthread); 692 if ((error = namei(nd)) != 0) { 693 nd->ni_vp = NULL; 694 goto fail; 695 } 696 NDFREE(nd, NDF_ONLY_PNBUF); 697 imgp->vp = nd->ni_vp; 698 699 /* 700 * Check permissions, modes, uid, etc on the file, and "open" it. 701 */ 702 error = exec_check_permissions(imgp); 703 if (error) 704 goto fail; 705 706 error = exec_map_first_page(imgp); 707 if (error) 708 goto fail; 709 710 /* 711 * Also make certain that the interpreter stays the same, so set 712 * its VV_TEXT flag, too. 713 */ 714 VOP_SET_TEXT(nd->ni_vp); 715 716 imgp->object = nd->ni_vp->v_object; 717 718 hdr = (const Elf_Ehdr *)imgp->image_header; 719 if ((error = __elfN(check_header)(hdr)) != 0) 720 goto fail; 721 if (hdr->e_type == ET_DYN) 722 rbase = *addr; 723 else if (hdr->e_type == ET_EXEC) 724 rbase = 0; 725 else { 726 error = ENOEXEC; 727 goto fail; 728 } 729 730 /* Only support headers that fit within first page for now */ 731 if ((hdr->e_phoff > PAGE_SIZE) || 732 (u_int)hdr->e_phentsize * hdr->e_phnum > PAGE_SIZE - hdr->e_phoff) { 733 error = ENOEXEC; 734 goto fail; 735 } 736 737 phdr = (const Elf_Phdr *)(imgp->image_header + hdr->e_phoff); 738 if (!aligned(phdr, Elf_Addr)) { 739 error = ENOEXEC; 740 goto fail; 741 } 742 743 for (i = 0, numsegs = 0; i < hdr->e_phnum; i++) { 744 if (phdr[i].p_type == PT_LOAD && phdr[i].p_memsz != 0) { 745 /* Loadable segment */ 746 prot = __elfN(trans_prot)(phdr[i].p_flags); 747 error = __elfN(load_section)(imgp, phdr[i].p_offset, 748 (caddr_t)(uintptr_t)phdr[i].p_vaddr + rbase, 749 phdr[i].p_memsz, phdr[i].p_filesz, prot, pagesize); 750 if (error != 0) 751 goto fail; 752 /* 753 * Establish the base address if this is the 754 * first segment. 755 */ 756 if (numsegs == 0) 757 base_addr = trunc_page(phdr[i].p_vaddr + 758 rbase); 759 numsegs++; 760 } 761 } 762 *addr = base_addr; 763 *entry = (unsigned long)hdr->e_entry + rbase; 764 765 fail: 766 if (imgp->firstpage) 767 exec_unmap_first_page(imgp); 768 769 if (nd->ni_vp) 770 vput(nd->ni_vp); 771 772 free(tempdata, M_TEMP); 773 774 return (error); 775 } 776 777 static int 778 __CONCAT(exec_, __elfN(imgact))(struct image_params *imgp) 779 { 780 struct thread *td; 781 const Elf_Ehdr *hdr; 782 const Elf_Phdr *phdr; 783 Elf_Auxargs *elf_auxargs; 784 struct vmspace *vmspace; 785 const char *err_str, *newinterp; 786 char *interp, *interp_buf, *path; 787 Elf_Brandinfo *brand_info; 788 struct sysentvec *sv; 789 vm_prot_t prot; 790 u_long text_size, data_size, total_size, text_addr, data_addr; 791 u_long seg_size, seg_addr, addr, baddr, et_dyn_addr, entry, proghdr; 792 int32_t osrel; 793 int error, i, n, interp_name_len, have_interp; 794 795 hdr = (const Elf_Ehdr *)imgp->image_header; 796 797 /* 798 * Do we have a valid ELF header ? 799 * 800 * Only allow ET_EXEC & ET_DYN here, reject ET_DYN later 801 * if particular brand doesn't support it. 802 */ 803 if (__elfN(check_header)(hdr) != 0 || 804 (hdr->e_type != ET_EXEC && hdr->e_type != ET_DYN)) 805 return (-1); 806 807 /* 808 * From here on down, we return an errno, not -1, as we've 809 * detected an ELF file. 810 */ 811 812 if ((hdr->e_phoff > PAGE_SIZE) || 813 (u_int)hdr->e_phentsize * hdr->e_phnum > PAGE_SIZE - hdr->e_phoff) { 814 /* Only support headers in first page for now */ 815 uprintf("Program headers not in the first page\n"); 816 return (ENOEXEC); 817 } 818 phdr = (const Elf_Phdr *)(imgp->image_header + hdr->e_phoff); 819 if (!aligned(phdr, Elf_Addr)) { 820 uprintf("Unaligned program headers\n"); 821 return (ENOEXEC); 822 } 823 824 n = error = 0; 825 baddr = 0; 826 osrel = 0; 827 text_size = data_size = total_size = text_addr = data_addr = 0; 828 entry = proghdr = 0; 829 interp_name_len = 0; 830 err_str = newinterp = NULL; 831 interp = interp_buf = NULL; 832 td = curthread; 833 834 for (i = 0; i < hdr->e_phnum; i++) { 835 switch (phdr[i].p_type) { 836 case PT_LOAD: 837 if (n == 0) 838 baddr = phdr[i].p_vaddr; 839 n++; 840 break; 841 case PT_INTERP: 842 /* Path to interpreter */ 843 if (phdr[i].p_filesz < 2 || 844 phdr[i].p_filesz > MAXPATHLEN) { 845 uprintf("Invalid PT_INTERP\n"); 846 error = ENOEXEC; 847 goto ret; 848 } 849 if (interp != NULL) { 850 uprintf("Multiple PT_INTERP headers\n"); 851 error = ENOEXEC; 852 goto ret; 853 } 854 interp_name_len = phdr[i].p_filesz; 855 if (phdr[i].p_offset > PAGE_SIZE || 856 interp_name_len > PAGE_SIZE - phdr[i].p_offset) { 857 VOP_UNLOCK(imgp->vp, 0); 858 interp_buf = malloc(interp_name_len + 1, M_TEMP, 859 M_WAITOK); 860 vn_lock(imgp->vp, LK_EXCLUSIVE | LK_RETRY); 861 error = vn_rdwr(UIO_READ, imgp->vp, interp_buf, 862 interp_name_len, phdr[i].p_offset, 863 UIO_SYSSPACE, IO_NODELOCKED, td->td_ucred, 864 NOCRED, NULL, td); 865 if (error != 0) { 866 uprintf("i/o error PT_INTERP %d\n", 867 error); 868 goto ret; 869 } 870 interp_buf[interp_name_len] = '\0'; 871 interp = interp_buf; 872 } else { 873 interp = __DECONST(char *, imgp->image_header) + 874 phdr[i].p_offset; 875 if (interp[interp_name_len - 1] != '\0') { 876 uprintf("Invalid PT_INTERP\n"); 877 error = ENOEXEC; 878 goto ret; 879 } 880 } 881 break; 882 case PT_GNU_STACK: 883 if (__elfN(nxstack)) 884 imgp->stack_prot = 885 __elfN(trans_prot)(phdr[i].p_flags); 886 imgp->stack_sz = phdr[i].p_memsz; 887 break; 888 } 889 } 890 891 brand_info = __elfN(get_brandinfo)(imgp, interp, interp_name_len, 892 &osrel); 893 if (brand_info == NULL) { 894 uprintf("ELF binary type \"%u\" not known.\n", 895 hdr->e_ident[EI_OSABI]); 896 error = ENOEXEC; 897 goto ret; 898 } 899 et_dyn_addr = 0; 900 if (hdr->e_type == ET_DYN) { 901 if ((brand_info->flags & BI_CAN_EXEC_DYN) == 0) { 902 uprintf("Cannot execute shared object\n"); 903 error = ENOEXEC; 904 goto ret; 905 } 906 /* 907 * Honour the base load address from the dso if it is 908 * non-zero for some reason. 909 */ 910 if (baddr == 0) 911 et_dyn_addr = ET_DYN_LOAD_ADDR; 912 } 913 sv = brand_info->sysvec; 914 if (interp != NULL && brand_info->interp_newpath != NULL) 915 newinterp = brand_info->interp_newpath; 916 917 /* 918 * Avoid a possible deadlock if the current address space is destroyed 919 * and that address space maps the locked vnode. In the common case, 920 * the locked vnode's v_usecount is decremented but remains greater 921 * than zero. Consequently, the vnode lock is not needed by vrele(). 922 * However, in cases where the vnode lock is external, such as nullfs, 923 * v_usecount may become zero. 924 * 925 * The VV_TEXT flag prevents modifications to the executable while 926 * the vnode is unlocked. 927 */ 928 VOP_UNLOCK(imgp->vp, 0); 929 930 error = exec_new_vmspace(imgp, sv); 931 imgp->proc->p_sysent = sv; 932 933 vn_lock(imgp->vp, LK_EXCLUSIVE | LK_RETRY); 934 if (error != 0) 935 goto ret; 936 937 for (i = 0; i < hdr->e_phnum; i++) { 938 switch (phdr[i].p_type) { 939 case PT_LOAD: /* Loadable segment */ 940 if (phdr[i].p_memsz == 0) 941 break; 942 prot = __elfN(trans_prot)(phdr[i].p_flags); 943 error = __elfN(load_section)(imgp, phdr[i].p_offset, 944 (caddr_t)(uintptr_t)phdr[i].p_vaddr + et_dyn_addr, 945 phdr[i].p_memsz, phdr[i].p_filesz, prot, 946 sv->sv_pagesize); 947 if (error != 0) 948 goto ret; 949 950 /* 951 * If this segment contains the program headers, 952 * remember their virtual address for the AT_PHDR 953 * aux entry. Static binaries don't usually include 954 * a PT_PHDR entry. 955 */ 956 if (phdr[i].p_offset == 0 && 957 hdr->e_phoff + hdr->e_phnum * hdr->e_phentsize 958 <= phdr[i].p_filesz) 959 proghdr = phdr[i].p_vaddr + hdr->e_phoff + 960 et_dyn_addr; 961 962 seg_addr = trunc_page(phdr[i].p_vaddr + et_dyn_addr); 963 seg_size = round_page(phdr[i].p_memsz + 964 phdr[i].p_vaddr + et_dyn_addr - seg_addr); 965 966 /* 967 * Make the largest executable segment the official 968 * text segment and all others data. 969 * 970 * Note that obreak() assumes that data_addr + 971 * data_size == end of data load area, and the ELF 972 * file format expects segments to be sorted by 973 * address. If multiple data segments exist, the 974 * last one will be used. 975 */ 976 977 if (phdr[i].p_flags & PF_X && text_size < seg_size) { 978 text_size = seg_size; 979 text_addr = seg_addr; 980 } else { 981 data_size = seg_size; 982 data_addr = seg_addr; 983 } 984 total_size += seg_size; 985 break; 986 case PT_PHDR: /* Program header table info */ 987 proghdr = phdr[i].p_vaddr + et_dyn_addr; 988 break; 989 default: 990 break; 991 } 992 } 993 994 if (data_addr == 0 && data_size == 0) { 995 data_addr = text_addr; 996 data_size = text_size; 997 } 998 999 entry = (u_long)hdr->e_entry + et_dyn_addr; 1000 1001 /* 1002 * Check limits. It should be safe to check the 1003 * limits after loading the segments since we do 1004 * not actually fault in all the segments pages. 1005 */ 1006 PROC_LOCK(imgp->proc); 1007 if (data_size > lim_cur_proc(imgp->proc, RLIMIT_DATA)) 1008 err_str = "Data segment size exceeds process limit"; 1009 else if (text_size > maxtsiz) 1010 err_str = "Text segment size exceeds system limit"; 1011 else if (total_size > lim_cur_proc(imgp->proc, RLIMIT_VMEM)) 1012 err_str = "Total segment size exceeds process limit"; 1013 else if (racct_set(imgp->proc, RACCT_DATA, data_size) != 0) 1014 err_str = "Data segment size exceeds resource limit"; 1015 else if (racct_set(imgp->proc, RACCT_VMEM, total_size) != 0) 1016 err_str = "Total segment size exceeds resource limit"; 1017 if (err_str != NULL) { 1018 PROC_UNLOCK(imgp->proc); 1019 uprintf("%s\n", err_str); 1020 error = ENOMEM; 1021 goto ret; 1022 } 1023 1024 vmspace = imgp->proc->p_vmspace; 1025 vmspace->vm_tsize = text_size >> PAGE_SHIFT; 1026 vmspace->vm_taddr = (caddr_t)(uintptr_t)text_addr; 1027 vmspace->vm_dsize = data_size >> PAGE_SHIFT; 1028 vmspace->vm_daddr = (caddr_t)(uintptr_t)data_addr; 1029 1030 /* 1031 * We load the dynamic linker where a userland call 1032 * to mmap(0, ...) would put it. The rationale behind this 1033 * calculation is that it leaves room for the heap to grow to 1034 * its maximum allowed size. 1035 */ 1036 addr = round_page((vm_offset_t)vmspace->vm_daddr + lim_max(td, 1037 RLIMIT_DATA)); 1038 PROC_UNLOCK(imgp->proc); 1039 1040 imgp->entry_addr = entry; 1041 1042 if (interp != NULL) { 1043 have_interp = FALSE; 1044 VOP_UNLOCK(imgp->vp, 0); 1045 if (brand_info->emul_path != NULL && 1046 brand_info->emul_path[0] != '\0') { 1047 path = malloc(MAXPATHLEN, M_TEMP, M_WAITOK); 1048 snprintf(path, MAXPATHLEN, "%s%s", 1049 brand_info->emul_path, interp); 1050 error = __elfN(load_file)(imgp->proc, path, &addr, 1051 &imgp->entry_addr, sv->sv_pagesize); 1052 free(path, M_TEMP); 1053 if (error == 0) 1054 have_interp = TRUE; 1055 } 1056 if (!have_interp && newinterp != NULL && 1057 (brand_info->interp_path == NULL || 1058 strcmp(interp, brand_info->interp_path) == 0)) { 1059 error = __elfN(load_file)(imgp->proc, newinterp, &addr, 1060 &imgp->entry_addr, sv->sv_pagesize); 1061 if (error == 0) 1062 have_interp = TRUE; 1063 } 1064 if (!have_interp) { 1065 error = __elfN(load_file)(imgp->proc, interp, &addr, 1066 &imgp->entry_addr, sv->sv_pagesize); 1067 } 1068 vn_lock(imgp->vp, LK_EXCLUSIVE | LK_RETRY); 1069 if (error != 0) { 1070 uprintf("ELF interpreter %s not found, error %d\n", 1071 interp, error); 1072 goto ret; 1073 } 1074 } else 1075 addr = et_dyn_addr; 1076 1077 /* 1078 * Construct auxargs table (used by the fixup routine) 1079 */ 1080 elf_auxargs = malloc(sizeof(Elf_Auxargs), M_TEMP, M_WAITOK); 1081 elf_auxargs->execfd = -1; 1082 elf_auxargs->phdr = proghdr; 1083 elf_auxargs->phent = hdr->e_phentsize; 1084 elf_auxargs->phnum = hdr->e_phnum; 1085 elf_auxargs->pagesz = PAGE_SIZE; 1086 elf_auxargs->base = addr; 1087 elf_auxargs->flags = 0; 1088 elf_auxargs->entry = entry; 1089 elf_auxargs->hdr_eflags = hdr->e_flags; 1090 1091 imgp->auxargs = elf_auxargs; 1092 imgp->interpreted = 0; 1093 imgp->reloc_base = addr; 1094 imgp->proc->p_osrel = osrel; 1095 imgp->proc->p_elf_machine = hdr->e_machine; 1096 imgp->proc->p_elf_flags = hdr->e_flags; 1097 1098 ret: 1099 free(interp_buf, M_TEMP); 1100 return (error); 1101 } 1102 1103 #define suword __CONCAT(suword, __ELF_WORD_SIZE) 1104 1105 int 1106 __elfN(freebsd_fixup)(register_t **stack_base, struct image_params *imgp) 1107 { 1108 Elf_Auxargs *args = (Elf_Auxargs *)imgp->auxargs; 1109 Elf_Auxinfo *argarray, *pos; 1110 Elf_Addr *base, *auxbase; 1111 int error; 1112 1113 base = (Elf_Addr *)*stack_base; 1114 auxbase = base + imgp->args->argc + 1 + imgp->args->envc + 1; 1115 argarray = pos = malloc(AT_COUNT * sizeof(*pos), M_TEMP, 1116 M_WAITOK | M_ZERO); 1117 1118 if (args->execfd != -1) 1119 AUXARGS_ENTRY(pos, AT_EXECFD, args->execfd); 1120 AUXARGS_ENTRY(pos, AT_PHDR, args->phdr); 1121 AUXARGS_ENTRY(pos, AT_PHENT, args->phent); 1122 AUXARGS_ENTRY(pos, AT_PHNUM, args->phnum); 1123 AUXARGS_ENTRY(pos, AT_PAGESZ, args->pagesz); 1124 AUXARGS_ENTRY(pos, AT_FLAGS, args->flags); 1125 AUXARGS_ENTRY(pos, AT_ENTRY, args->entry); 1126 AUXARGS_ENTRY(pos, AT_BASE, args->base); 1127 AUXARGS_ENTRY(pos, AT_EHDRFLAGS, args->hdr_eflags); 1128 if (imgp->execpathp != 0) 1129 AUXARGS_ENTRY(pos, AT_EXECPATH, imgp->execpathp); 1130 AUXARGS_ENTRY(pos, AT_OSRELDATE, 1131 imgp->proc->p_ucred->cr_prison->pr_osreldate); 1132 if (imgp->canary != 0) { 1133 AUXARGS_ENTRY(pos, AT_CANARY, imgp->canary); 1134 AUXARGS_ENTRY(pos, AT_CANARYLEN, imgp->canarylen); 1135 } 1136 AUXARGS_ENTRY(pos, AT_NCPUS, mp_ncpus); 1137 if (imgp->pagesizes != 0) { 1138 AUXARGS_ENTRY(pos, AT_PAGESIZES, imgp->pagesizes); 1139 AUXARGS_ENTRY(pos, AT_PAGESIZESLEN, imgp->pagesizeslen); 1140 } 1141 if (imgp->sysent->sv_timekeep_base != 0) { 1142 AUXARGS_ENTRY(pos, AT_TIMEKEEP, 1143 imgp->sysent->sv_timekeep_base); 1144 } 1145 AUXARGS_ENTRY(pos, AT_STACKPROT, imgp->sysent->sv_shared_page_obj 1146 != NULL && imgp->stack_prot != 0 ? imgp->stack_prot : 1147 imgp->sysent->sv_stackprot); 1148 if (imgp->sysent->sv_hwcap != NULL) 1149 AUXARGS_ENTRY(pos, AT_HWCAP, *imgp->sysent->sv_hwcap); 1150 if (imgp->sysent->sv_hwcap2 != NULL) 1151 AUXARGS_ENTRY(pos, AT_HWCAP2, *imgp->sysent->sv_hwcap2); 1152 AUXARGS_ENTRY(pos, AT_NULL, 0); 1153 1154 free(imgp->auxargs, M_TEMP); 1155 imgp->auxargs = NULL; 1156 KASSERT(pos - argarray <= AT_COUNT, ("Too many auxargs")); 1157 1158 error = copyout(argarray, auxbase, sizeof(*argarray) * AT_COUNT); 1159 free(argarray, M_TEMP); 1160 if (error != 0) 1161 return (error); 1162 1163 base--; 1164 if (suword(base, imgp->args->argc) == -1) 1165 return (EFAULT); 1166 *stack_base = (register_t *)base; 1167 return (0); 1168 } 1169 1170 /* 1171 * Code for generating ELF core dumps. 1172 */ 1173 1174 typedef void (*segment_callback)(vm_map_entry_t, void *); 1175 1176 /* Closure for cb_put_phdr(). */ 1177 struct phdr_closure { 1178 Elf_Phdr *phdr; /* Program header to fill in */ 1179 Elf_Off offset; /* Offset of segment in core file */ 1180 }; 1181 1182 /* Closure for cb_size_segment(). */ 1183 struct sseg_closure { 1184 int count; /* Count of writable segments. */ 1185 size_t size; /* Total size of all writable segments. */ 1186 }; 1187 1188 typedef void (*outfunc_t)(void *, struct sbuf *, size_t *); 1189 1190 struct note_info { 1191 int type; /* Note type. */ 1192 outfunc_t outfunc; /* Output function. */ 1193 void *outarg; /* Argument for the output function. */ 1194 size_t outsize; /* Output size. */ 1195 TAILQ_ENTRY(note_info) link; /* Link to the next note info. */ 1196 }; 1197 1198 TAILQ_HEAD(note_info_list, note_info); 1199 1200 /* Coredump output parameters. */ 1201 struct coredump_params { 1202 off_t offset; 1203 struct ucred *active_cred; 1204 struct ucred *file_cred; 1205 struct thread *td; 1206 struct vnode *vp; 1207 struct compressor *comp; 1208 }; 1209 1210 extern int compress_user_cores; 1211 extern int compress_user_cores_level; 1212 1213 static void cb_put_phdr(vm_map_entry_t, void *); 1214 static void cb_size_segment(vm_map_entry_t, void *); 1215 static int core_write(struct coredump_params *, const void *, size_t, off_t, 1216 enum uio_seg); 1217 static void each_dumpable_segment(struct thread *, segment_callback, void *); 1218 static int __elfN(corehdr)(struct coredump_params *, int, void *, size_t, 1219 struct note_info_list *, size_t); 1220 static void __elfN(prepare_notes)(struct thread *, struct note_info_list *, 1221 size_t *); 1222 static void __elfN(puthdr)(struct thread *, void *, size_t, int, size_t); 1223 static void __elfN(putnote)(struct note_info *, struct sbuf *); 1224 static size_t register_note(struct note_info_list *, int, outfunc_t, void *); 1225 static int sbuf_drain_core_output(void *, const char *, int); 1226 static int sbuf_drain_count(void *arg, const char *data, int len); 1227 1228 static void __elfN(note_fpregset)(void *, struct sbuf *, size_t *); 1229 static void __elfN(note_prpsinfo)(void *, struct sbuf *, size_t *); 1230 static void __elfN(note_prstatus)(void *, struct sbuf *, size_t *); 1231 static void __elfN(note_threadmd)(void *, struct sbuf *, size_t *); 1232 static void __elfN(note_thrmisc)(void *, struct sbuf *, size_t *); 1233 static void __elfN(note_ptlwpinfo)(void *, struct sbuf *, size_t *); 1234 static void __elfN(note_procstat_auxv)(void *, struct sbuf *, size_t *); 1235 static void __elfN(note_procstat_proc)(void *, struct sbuf *, size_t *); 1236 static void __elfN(note_procstat_psstrings)(void *, struct sbuf *, size_t *); 1237 static void note_procstat_files(void *, struct sbuf *, size_t *); 1238 static void note_procstat_groups(void *, struct sbuf *, size_t *); 1239 static void note_procstat_osrel(void *, struct sbuf *, size_t *); 1240 static void note_procstat_rlimit(void *, struct sbuf *, size_t *); 1241 static void note_procstat_umask(void *, struct sbuf *, size_t *); 1242 static void note_procstat_vmmap(void *, struct sbuf *, size_t *); 1243 1244 /* 1245 * Write out a core segment to the compression stream. 1246 */ 1247 static int 1248 compress_chunk(struct coredump_params *p, char *base, char *buf, u_int len) 1249 { 1250 u_int chunk_len; 1251 int error; 1252 1253 while (len > 0) { 1254 chunk_len = MIN(len, CORE_BUF_SIZE); 1255 1256 /* 1257 * We can get EFAULT error here. 1258 * In that case zero out the current chunk of the segment. 1259 */ 1260 error = copyin(base, buf, chunk_len); 1261 if (error != 0) 1262 bzero(buf, chunk_len); 1263 error = compressor_write(p->comp, buf, chunk_len); 1264 if (error != 0) 1265 break; 1266 base += chunk_len; 1267 len -= chunk_len; 1268 } 1269 return (error); 1270 } 1271 1272 static int 1273 core_compressed_write(void *base, size_t len, off_t offset, void *arg) 1274 { 1275 1276 return (core_write((struct coredump_params *)arg, base, len, offset, 1277 UIO_SYSSPACE)); 1278 } 1279 1280 static int 1281 core_write(struct coredump_params *p, const void *base, size_t len, 1282 off_t offset, enum uio_seg seg) 1283 { 1284 1285 return (vn_rdwr_inchunks(UIO_WRITE, p->vp, __DECONST(void *, base), 1286 len, offset, seg, IO_UNIT | IO_DIRECT | IO_RANGELOCKED, 1287 p->active_cred, p->file_cred, NULL, p->td)); 1288 } 1289 1290 static int 1291 core_output(void *base, size_t len, off_t offset, struct coredump_params *p, 1292 void *tmpbuf) 1293 { 1294 int error; 1295 1296 if (p->comp != NULL) 1297 return (compress_chunk(p, base, tmpbuf, len)); 1298 1299 /* 1300 * EFAULT is a non-fatal error that we can get, for example, 1301 * if the segment is backed by a file but extends beyond its 1302 * end. 1303 */ 1304 error = core_write(p, base, len, offset, UIO_USERSPACE); 1305 if (error == EFAULT) { 1306 log(LOG_WARNING, "Failed to fully fault in a core file segment " 1307 "at VA %p with size 0x%zx to be written at offset 0x%jx " 1308 "for process %s\n", base, len, offset, curproc->p_comm); 1309 1310 /* 1311 * Write a "real" zero byte at the end of the target region 1312 * in the case this is the last segment. 1313 * The intermediate space will be implicitly zero-filled. 1314 */ 1315 error = core_write(p, zero_region, 1, offset + len - 1, 1316 UIO_SYSSPACE); 1317 } 1318 return (error); 1319 } 1320 1321 /* 1322 * Drain into a core file. 1323 */ 1324 static int 1325 sbuf_drain_core_output(void *arg, const char *data, int len) 1326 { 1327 struct coredump_params *p; 1328 int error, locked; 1329 1330 p = (struct coredump_params *)arg; 1331 1332 /* 1333 * Some kern_proc out routines that print to this sbuf may 1334 * call us with the process lock held. Draining with the 1335 * non-sleepable lock held is unsafe. The lock is needed for 1336 * those routines when dumping a live process. In our case we 1337 * can safely release the lock before draining and acquire 1338 * again after. 1339 */ 1340 locked = PROC_LOCKED(p->td->td_proc); 1341 if (locked) 1342 PROC_UNLOCK(p->td->td_proc); 1343 if (p->comp != NULL) 1344 error = compressor_write(p->comp, __DECONST(char *, data), len); 1345 else 1346 error = core_write(p, __DECONST(void *, data), len, p->offset, 1347 UIO_SYSSPACE); 1348 if (locked) 1349 PROC_LOCK(p->td->td_proc); 1350 if (error != 0) 1351 return (-error); 1352 p->offset += len; 1353 return (len); 1354 } 1355 1356 /* 1357 * Drain into a counter. 1358 */ 1359 static int 1360 sbuf_drain_count(void *arg, const char *data __unused, int len) 1361 { 1362 size_t *sizep; 1363 1364 sizep = (size_t *)arg; 1365 *sizep += len; 1366 return (len); 1367 } 1368 1369 int 1370 __elfN(coredump)(struct thread *td, struct vnode *vp, off_t limit, int flags) 1371 { 1372 struct ucred *cred = td->td_ucred; 1373 int error = 0; 1374 struct sseg_closure seginfo; 1375 struct note_info_list notelst; 1376 struct coredump_params params; 1377 struct note_info *ninfo; 1378 void *hdr, *tmpbuf; 1379 size_t hdrsize, notesz, coresize; 1380 1381 hdr = NULL; 1382 tmpbuf = NULL; 1383 TAILQ_INIT(¬elst); 1384 1385 /* Size the program segments. */ 1386 seginfo.count = 0; 1387 seginfo.size = 0; 1388 each_dumpable_segment(td, cb_size_segment, &seginfo); 1389 1390 /* 1391 * Collect info about the core file header area. 1392 */ 1393 hdrsize = sizeof(Elf_Ehdr) + sizeof(Elf_Phdr) * (1 + seginfo.count); 1394 if (seginfo.count + 1 >= PN_XNUM) 1395 hdrsize += sizeof(Elf_Shdr); 1396 __elfN(prepare_notes)(td, ¬elst, ¬esz); 1397 coresize = round_page(hdrsize + notesz) + seginfo.size; 1398 1399 /* Set up core dump parameters. */ 1400 params.offset = 0; 1401 params.active_cred = cred; 1402 params.file_cred = NOCRED; 1403 params.td = td; 1404 params.vp = vp; 1405 params.comp = NULL; 1406 1407 #ifdef RACCT 1408 if (racct_enable) { 1409 PROC_LOCK(td->td_proc); 1410 error = racct_add(td->td_proc, RACCT_CORE, coresize); 1411 PROC_UNLOCK(td->td_proc); 1412 if (error != 0) { 1413 error = EFAULT; 1414 goto done; 1415 } 1416 } 1417 #endif 1418 if (coresize >= limit) { 1419 error = EFAULT; 1420 goto done; 1421 } 1422 1423 /* Create a compression stream if necessary. */ 1424 if (compress_user_cores != 0) { 1425 params.comp = compressor_init(core_compressed_write, 1426 compress_user_cores, CORE_BUF_SIZE, 1427 compress_user_cores_level, ¶ms); 1428 if (params.comp == NULL) { 1429 error = EFAULT; 1430 goto done; 1431 } 1432 tmpbuf = malloc(CORE_BUF_SIZE, M_TEMP, M_WAITOK | M_ZERO); 1433 } 1434 1435 /* 1436 * Allocate memory for building the header, fill it up, 1437 * and write it out following the notes. 1438 */ 1439 hdr = malloc(hdrsize, M_TEMP, M_WAITOK); 1440 error = __elfN(corehdr)(¶ms, seginfo.count, hdr, hdrsize, ¬elst, 1441 notesz); 1442 1443 /* Write the contents of all of the writable segments. */ 1444 if (error == 0) { 1445 Elf_Phdr *php; 1446 off_t offset; 1447 int i; 1448 1449 php = (Elf_Phdr *)((char *)hdr + sizeof(Elf_Ehdr)) + 1; 1450 offset = round_page(hdrsize + notesz); 1451 for (i = 0; i < seginfo.count; i++) { 1452 error = core_output((caddr_t)(uintptr_t)php->p_vaddr, 1453 php->p_filesz, offset, ¶ms, tmpbuf); 1454 if (error != 0) 1455 break; 1456 offset += php->p_filesz; 1457 php++; 1458 } 1459 if (error == 0 && params.comp != NULL) 1460 error = compressor_flush(params.comp); 1461 } 1462 if (error) { 1463 log(LOG_WARNING, 1464 "Failed to write core file for process %s (error %d)\n", 1465 curproc->p_comm, error); 1466 } 1467 1468 done: 1469 free(tmpbuf, M_TEMP); 1470 if (params.comp != NULL) 1471 compressor_fini(params.comp); 1472 while ((ninfo = TAILQ_FIRST(¬elst)) != NULL) { 1473 TAILQ_REMOVE(¬elst, ninfo, link); 1474 free(ninfo, M_TEMP); 1475 } 1476 if (hdr != NULL) 1477 free(hdr, M_TEMP); 1478 1479 return (error); 1480 } 1481 1482 /* 1483 * A callback for each_dumpable_segment() to write out the segment's 1484 * program header entry. 1485 */ 1486 static void 1487 cb_put_phdr(vm_map_entry_t entry, void *closure) 1488 { 1489 struct phdr_closure *phc = (struct phdr_closure *)closure; 1490 Elf_Phdr *phdr = phc->phdr; 1491 1492 phc->offset = round_page(phc->offset); 1493 1494 phdr->p_type = PT_LOAD; 1495 phdr->p_offset = phc->offset; 1496 phdr->p_vaddr = entry->start; 1497 phdr->p_paddr = 0; 1498 phdr->p_filesz = phdr->p_memsz = entry->end - entry->start; 1499 phdr->p_align = PAGE_SIZE; 1500 phdr->p_flags = __elfN(untrans_prot)(entry->protection); 1501 1502 phc->offset += phdr->p_filesz; 1503 phc->phdr++; 1504 } 1505 1506 /* 1507 * A callback for each_dumpable_segment() to gather information about 1508 * the number of segments and their total size. 1509 */ 1510 static void 1511 cb_size_segment(vm_map_entry_t entry, void *closure) 1512 { 1513 struct sseg_closure *ssc = (struct sseg_closure *)closure; 1514 1515 ssc->count++; 1516 ssc->size += entry->end - entry->start; 1517 } 1518 1519 /* 1520 * For each writable segment in the process's memory map, call the given 1521 * function with a pointer to the map entry and some arbitrary 1522 * caller-supplied data. 1523 */ 1524 static void 1525 each_dumpable_segment(struct thread *td, segment_callback func, void *closure) 1526 { 1527 struct proc *p = td->td_proc; 1528 vm_map_t map = &p->p_vmspace->vm_map; 1529 vm_map_entry_t entry; 1530 vm_object_t backing_object, object; 1531 boolean_t ignore_entry; 1532 1533 vm_map_lock_read(map); 1534 for (entry = map->header.next; entry != &map->header; 1535 entry = entry->next) { 1536 /* 1537 * Don't dump inaccessible mappings, deal with legacy 1538 * coredump mode. 1539 * 1540 * Note that read-only segments related to the elf binary 1541 * are marked MAP_ENTRY_NOCOREDUMP now so we no longer 1542 * need to arbitrarily ignore such segments. 1543 */ 1544 if (elf_legacy_coredump) { 1545 if ((entry->protection & VM_PROT_RW) != VM_PROT_RW) 1546 continue; 1547 } else { 1548 if ((entry->protection & VM_PROT_ALL) == 0) 1549 continue; 1550 } 1551 1552 /* 1553 * Dont include memory segment in the coredump if 1554 * MAP_NOCORE is set in mmap(2) or MADV_NOCORE in 1555 * madvise(2). Do not dump submaps (i.e. parts of the 1556 * kernel map). 1557 */ 1558 if (entry->eflags & (MAP_ENTRY_NOCOREDUMP|MAP_ENTRY_IS_SUB_MAP)) 1559 continue; 1560 1561 if ((object = entry->object.vm_object) == NULL) 1562 continue; 1563 1564 /* Ignore memory-mapped devices and such things. */ 1565 VM_OBJECT_RLOCK(object); 1566 while ((backing_object = object->backing_object) != NULL) { 1567 VM_OBJECT_RLOCK(backing_object); 1568 VM_OBJECT_RUNLOCK(object); 1569 object = backing_object; 1570 } 1571 ignore_entry = object->type != OBJT_DEFAULT && 1572 object->type != OBJT_SWAP && object->type != OBJT_VNODE && 1573 object->type != OBJT_PHYS; 1574 VM_OBJECT_RUNLOCK(object); 1575 if (ignore_entry) 1576 continue; 1577 1578 (*func)(entry, closure); 1579 } 1580 vm_map_unlock_read(map); 1581 } 1582 1583 /* 1584 * Write the core file header to the file, including padding up to 1585 * the page boundary. 1586 */ 1587 static int 1588 __elfN(corehdr)(struct coredump_params *p, int numsegs, void *hdr, 1589 size_t hdrsize, struct note_info_list *notelst, size_t notesz) 1590 { 1591 struct note_info *ninfo; 1592 struct sbuf *sb; 1593 int error; 1594 1595 /* Fill in the header. */ 1596 bzero(hdr, hdrsize); 1597 __elfN(puthdr)(p->td, hdr, hdrsize, numsegs, notesz); 1598 1599 sb = sbuf_new(NULL, NULL, CORE_BUF_SIZE, SBUF_FIXEDLEN); 1600 sbuf_set_drain(sb, sbuf_drain_core_output, p); 1601 sbuf_start_section(sb, NULL); 1602 sbuf_bcat(sb, hdr, hdrsize); 1603 TAILQ_FOREACH(ninfo, notelst, link) 1604 __elfN(putnote)(ninfo, sb); 1605 /* Align up to a page boundary for the program segments. */ 1606 sbuf_end_section(sb, -1, PAGE_SIZE, 0); 1607 error = sbuf_finish(sb); 1608 sbuf_delete(sb); 1609 1610 return (error); 1611 } 1612 1613 static void 1614 __elfN(prepare_notes)(struct thread *td, struct note_info_list *list, 1615 size_t *sizep) 1616 { 1617 struct proc *p; 1618 struct thread *thr; 1619 size_t size; 1620 1621 p = td->td_proc; 1622 size = 0; 1623 1624 size += register_note(list, NT_PRPSINFO, __elfN(note_prpsinfo), p); 1625 1626 /* 1627 * To have the debugger select the right thread (LWP) as the initial 1628 * thread, we dump the state of the thread passed to us in td first. 1629 * This is the thread that causes the core dump and thus likely to 1630 * be the right thread one wants to have selected in the debugger. 1631 */ 1632 thr = td; 1633 while (thr != NULL) { 1634 size += register_note(list, NT_PRSTATUS, 1635 __elfN(note_prstatus), thr); 1636 size += register_note(list, NT_FPREGSET, 1637 __elfN(note_fpregset), thr); 1638 size += register_note(list, NT_THRMISC, 1639 __elfN(note_thrmisc), thr); 1640 size += register_note(list, NT_PTLWPINFO, 1641 __elfN(note_ptlwpinfo), thr); 1642 size += register_note(list, -1, 1643 __elfN(note_threadmd), thr); 1644 1645 thr = (thr == td) ? TAILQ_FIRST(&p->p_threads) : 1646 TAILQ_NEXT(thr, td_plist); 1647 if (thr == td) 1648 thr = TAILQ_NEXT(thr, td_plist); 1649 } 1650 1651 size += register_note(list, NT_PROCSTAT_PROC, 1652 __elfN(note_procstat_proc), p); 1653 size += register_note(list, NT_PROCSTAT_FILES, 1654 note_procstat_files, p); 1655 size += register_note(list, NT_PROCSTAT_VMMAP, 1656 note_procstat_vmmap, p); 1657 size += register_note(list, NT_PROCSTAT_GROUPS, 1658 note_procstat_groups, p); 1659 size += register_note(list, NT_PROCSTAT_UMASK, 1660 note_procstat_umask, p); 1661 size += register_note(list, NT_PROCSTAT_RLIMIT, 1662 note_procstat_rlimit, p); 1663 size += register_note(list, NT_PROCSTAT_OSREL, 1664 note_procstat_osrel, p); 1665 size += register_note(list, NT_PROCSTAT_PSSTRINGS, 1666 __elfN(note_procstat_psstrings), p); 1667 size += register_note(list, NT_PROCSTAT_AUXV, 1668 __elfN(note_procstat_auxv), p); 1669 1670 *sizep = size; 1671 } 1672 1673 static void 1674 __elfN(puthdr)(struct thread *td, void *hdr, size_t hdrsize, int numsegs, 1675 size_t notesz) 1676 { 1677 Elf_Ehdr *ehdr; 1678 Elf_Phdr *phdr; 1679 Elf_Shdr *shdr; 1680 struct phdr_closure phc; 1681 1682 ehdr = (Elf_Ehdr *)hdr; 1683 1684 ehdr->e_ident[EI_MAG0] = ELFMAG0; 1685 ehdr->e_ident[EI_MAG1] = ELFMAG1; 1686 ehdr->e_ident[EI_MAG2] = ELFMAG2; 1687 ehdr->e_ident[EI_MAG3] = ELFMAG3; 1688 ehdr->e_ident[EI_CLASS] = ELF_CLASS; 1689 ehdr->e_ident[EI_DATA] = ELF_DATA; 1690 ehdr->e_ident[EI_VERSION] = EV_CURRENT; 1691 ehdr->e_ident[EI_OSABI] = ELFOSABI_FREEBSD; 1692 ehdr->e_ident[EI_ABIVERSION] = 0; 1693 ehdr->e_ident[EI_PAD] = 0; 1694 ehdr->e_type = ET_CORE; 1695 ehdr->e_machine = td->td_proc->p_elf_machine; 1696 ehdr->e_version = EV_CURRENT; 1697 ehdr->e_entry = 0; 1698 ehdr->e_phoff = sizeof(Elf_Ehdr); 1699 ehdr->e_flags = td->td_proc->p_elf_flags; 1700 ehdr->e_ehsize = sizeof(Elf_Ehdr); 1701 ehdr->e_phentsize = sizeof(Elf_Phdr); 1702 ehdr->e_shentsize = sizeof(Elf_Shdr); 1703 ehdr->e_shstrndx = SHN_UNDEF; 1704 if (numsegs + 1 < PN_XNUM) { 1705 ehdr->e_phnum = numsegs + 1; 1706 ehdr->e_shnum = 0; 1707 } else { 1708 ehdr->e_phnum = PN_XNUM; 1709 ehdr->e_shnum = 1; 1710 1711 ehdr->e_shoff = ehdr->e_phoff + 1712 (numsegs + 1) * ehdr->e_phentsize; 1713 KASSERT(ehdr->e_shoff == hdrsize - sizeof(Elf_Shdr), 1714 ("e_shoff: %zu, hdrsize - shdr: %zu", 1715 (size_t)ehdr->e_shoff, hdrsize - sizeof(Elf_Shdr))); 1716 1717 shdr = (Elf_Shdr *)((char *)hdr + ehdr->e_shoff); 1718 memset(shdr, 0, sizeof(*shdr)); 1719 /* 1720 * A special first section is used to hold large segment and 1721 * section counts. This was proposed by Sun Microsystems in 1722 * Solaris and has been adopted by Linux; the standard ELF 1723 * tools are already familiar with the technique. 1724 * 1725 * See table 7-7 of the Solaris "Linker and Libraries Guide" 1726 * (or 12-7 depending on the version of the document) for more 1727 * details. 1728 */ 1729 shdr->sh_type = SHT_NULL; 1730 shdr->sh_size = ehdr->e_shnum; 1731 shdr->sh_link = ehdr->e_shstrndx; 1732 shdr->sh_info = numsegs + 1; 1733 } 1734 1735 /* 1736 * Fill in the program header entries. 1737 */ 1738 phdr = (Elf_Phdr *)((char *)hdr + ehdr->e_phoff); 1739 1740 /* The note segement. */ 1741 phdr->p_type = PT_NOTE; 1742 phdr->p_offset = hdrsize; 1743 phdr->p_vaddr = 0; 1744 phdr->p_paddr = 0; 1745 phdr->p_filesz = notesz; 1746 phdr->p_memsz = 0; 1747 phdr->p_flags = PF_R; 1748 phdr->p_align = ELF_NOTE_ROUNDSIZE; 1749 phdr++; 1750 1751 /* All the writable segments from the program. */ 1752 phc.phdr = phdr; 1753 phc.offset = round_page(hdrsize + notesz); 1754 each_dumpable_segment(td, cb_put_phdr, &phc); 1755 } 1756 1757 static size_t 1758 register_note(struct note_info_list *list, int type, outfunc_t out, void *arg) 1759 { 1760 struct note_info *ninfo; 1761 size_t size, notesize; 1762 1763 size = 0; 1764 out(arg, NULL, &size); 1765 ninfo = malloc(sizeof(*ninfo), M_TEMP, M_ZERO | M_WAITOK); 1766 ninfo->type = type; 1767 ninfo->outfunc = out; 1768 ninfo->outarg = arg; 1769 ninfo->outsize = size; 1770 TAILQ_INSERT_TAIL(list, ninfo, link); 1771 1772 if (type == -1) 1773 return (size); 1774 1775 notesize = sizeof(Elf_Note) + /* note header */ 1776 roundup2(sizeof(FREEBSD_ABI_VENDOR), ELF_NOTE_ROUNDSIZE) + 1777 /* note name */ 1778 roundup2(size, ELF_NOTE_ROUNDSIZE); /* note description */ 1779 1780 return (notesize); 1781 } 1782 1783 static size_t 1784 append_note_data(const void *src, void *dst, size_t len) 1785 { 1786 size_t padded_len; 1787 1788 padded_len = roundup2(len, ELF_NOTE_ROUNDSIZE); 1789 if (dst != NULL) { 1790 bcopy(src, dst, len); 1791 bzero((char *)dst + len, padded_len - len); 1792 } 1793 return (padded_len); 1794 } 1795 1796 size_t 1797 __elfN(populate_note)(int type, void *src, void *dst, size_t size, void **descp) 1798 { 1799 Elf_Note *note; 1800 char *buf; 1801 size_t notesize; 1802 1803 buf = dst; 1804 if (buf != NULL) { 1805 note = (Elf_Note *)buf; 1806 note->n_namesz = sizeof(FREEBSD_ABI_VENDOR); 1807 note->n_descsz = size; 1808 note->n_type = type; 1809 buf += sizeof(*note); 1810 buf += append_note_data(FREEBSD_ABI_VENDOR, buf, 1811 sizeof(FREEBSD_ABI_VENDOR)); 1812 append_note_data(src, buf, size); 1813 if (descp != NULL) 1814 *descp = buf; 1815 } 1816 1817 notesize = sizeof(Elf_Note) + /* note header */ 1818 roundup2(sizeof(FREEBSD_ABI_VENDOR), ELF_NOTE_ROUNDSIZE) + 1819 /* note name */ 1820 roundup2(size, ELF_NOTE_ROUNDSIZE); /* note description */ 1821 1822 return (notesize); 1823 } 1824 1825 static void 1826 __elfN(putnote)(struct note_info *ninfo, struct sbuf *sb) 1827 { 1828 Elf_Note note; 1829 ssize_t old_len, sect_len; 1830 size_t new_len, descsz, i; 1831 1832 if (ninfo->type == -1) { 1833 ninfo->outfunc(ninfo->outarg, sb, &ninfo->outsize); 1834 return; 1835 } 1836 1837 note.n_namesz = sizeof(FREEBSD_ABI_VENDOR); 1838 note.n_descsz = ninfo->outsize; 1839 note.n_type = ninfo->type; 1840 1841 sbuf_bcat(sb, ¬e, sizeof(note)); 1842 sbuf_start_section(sb, &old_len); 1843 sbuf_bcat(sb, FREEBSD_ABI_VENDOR, sizeof(FREEBSD_ABI_VENDOR)); 1844 sbuf_end_section(sb, old_len, ELF_NOTE_ROUNDSIZE, 0); 1845 if (note.n_descsz == 0) 1846 return; 1847 sbuf_start_section(sb, &old_len); 1848 ninfo->outfunc(ninfo->outarg, sb, &ninfo->outsize); 1849 sect_len = sbuf_end_section(sb, old_len, ELF_NOTE_ROUNDSIZE, 0); 1850 if (sect_len < 0) 1851 return; 1852 1853 new_len = (size_t)sect_len; 1854 descsz = roundup(note.n_descsz, ELF_NOTE_ROUNDSIZE); 1855 if (new_len < descsz) { 1856 /* 1857 * It is expected that individual note emitters will correctly 1858 * predict their expected output size and fill up to that size 1859 * themselves, padding in a format-specific way if needed. 1860 * However, in case they don't, just do it here with zeros. 1861 */ 1862 for (i = 0; i < descsz - new_len; i++) 1863 sbuf_putc(sb, 0); 1864 } else if (new_len > descsz) { 1865 /* 1866 * We can't always truncate sb -- we may have drained some 1867 * of it already. 1868 */ 1869 KASSERT(new_len == descsz, ("%s: Note type %u changed as we " 1870 "read it (%zu > %zu). Since it is longer than " 1871 "expected, this coredump's notes are corrupt. THIS " 1872 "IS A BUG in the note_procstat routine for type %u.\n", 1873 __func__, (unsigned)note.n_type, new_len, descsz, 1874 (unsigned)note.n_type)); 1875 } 1876 } 1877 1878 /* 1879 * Miscellaneous note out functions. 1880 */ 1881 1882 #if defined(COMPAT_FREEBSD32) && __ELF_WORD_SIZE == 32 1883 #include <compat/freebsd32/freebsd32.h> 1884 #include <compat/freebsd32/freebsd32_signal.h> 1885 1886 typedef struct prstatus32 elf_prstatus_t; 1887 typedef struct prpsinfo32 elf_prpsinfo_t; 1888 typedef struct fpreg32 elf_prfpregset_t; 1889 typedef struct fpreg32 elf_fpregset_t; 1890 typedef struct reg32 elf_gregset_t; 1891 typedef struct thrmisc32 elf_thrmisc_t; 1892 #define ELF_KERN_PROC_MASK KERN_PROC_MASK32 1893 typedef struct kinfo_proc32 elf_kinfo_proc_t; 1894 typedef uint32_t elf_ps_strings_t; 1895 #else 1896 typedef prstatus_t elf_prstatus_t; 1897 typedef prpsinfo_t elf_prpsinfo_t; 1898 typedef prfpregset_t elf_prfpregset_t; 1899 typedef prfpregset_t elf_fpregset_t; 1900 typedef gregset_t elf_gregset_t; 1901 typedef thrmisc_t elf_thrmisc_t; 1902 #define ELF_KERN_PROC_MASK 0 1903 typedef struct kinfo_proc elf_kinfo_proc_t; 1904 typedef vm_offset_t elf_ps_strings_t; 1905 #endif 1906 1907 static void 1908 __elfN(note_prpsinfo)(void *arg, struct sbuf *sb, size_t *sizep) 1909 { 1910 struct sbuf sbarg; 1911 size_t len; 1912 char *cp, *end; 1913 struct proc *p; 1914 elf_prpsinfo_t *psinfo; 1915 int error; 1916 1917 p = (struct proc *)arg; 1918 if (sb != NULL) { 1919 KASSERT(*sizep == sizeof(*psinfo), ("invalid size")); 1920 psinfo = malloc(sizeof(*psinfo), M_TEMP, M_ZERO | M_WAITOK); 1921 psinfo->pr_version = PRPSINFO_VERSION; 1922 psinfo->pr_psinfosz = sizeof(elf_prpsinfo_t); 1923 strlcpy(psinfo->pr_fname, p->p_comm, sizeof(psinfo->pr_fname)); 1924 PROC_LOCK(p); 1925 if (p->p_args != NULL) { 1926 len = sizeof(psinfo->pr_psargs) - 1; 1927 if (len > p->p_args->ar_length) 1928 len = p->p_args->ar_length; 1929 memcpy(psinfo->pr_psargs, p->p_args->ar_args, len); 1930 PROC_UNLOCK(p); 1931 error = 0; 1932 } else { 1933 _PHOLD(p); 1934 PROC_UNLOCK(p); 1935 sbuf_new(&sbarg, psinfo->pr_psargs, 1936 sizeof(psinfo->pr_psargs), SBUF_FIXEDLEN); 1937 error = proc_getargv(curthread, p, &sbarg); 1938 PRELE(p); 1939 if (sbuf_finish(&sbarg) == 0) 1940 len = sbuf_len(&sbarg) - 1; 1941 else 1942 len = sizeof(psinfo->pr_psargs) - 1; 1943 sbuf_delete(&sbarg); 1944 } 1945 if (error || len == 0) 1946 strlcpy(psinfo->pr_psargs, p->p_comm, 1947 sizeof(psinfo->pr_psargs)); 1948 else { 1949 KASSERT(len < sizeof(psinfo->pr_psargs), 1950 ("len is too long: %zu vs %zu", len, 1951 sizeof(psinfo->pr_psargs))); 1952 cp = psinfo->pr_psargs; 1953 end = cp + len - 1; 1954 for (;;) { 1955 cp = memchr(cp, '\0', end - cp); 1956 if (cp == NULL) 1957 break; 1958 *cp = ' '; 1959 } 1960 } 1961 psinfo->pr_pid = p->p_pid; 1962 sbuf_bcat(sb, psinfo, sizeof(*psinfo)); 1963 free(psinfo, M_TEMP); 1964 } 1965 *sizep = sizeof(*psinfo); 1966 } 1967 1968 static void 1969 __elfN(note_prstatus)(void *arg, struct sbuf *sb, size_t *sizep) 1970 { 1971 struct thread *td; 1972 elf_prstatus_t *status; 1973 1974 td = (struct thread *)arg; 1975 if (sb != NULL) { 1976 KASSERT(*sizep == sizeof(*status), ("invalid size")); 1977 status = malloc(sizeof(*status), M_TEMP, M_ZERO | M_WAITOK); 1978 status->pr_version = PRSTATUS_VERSION; 1979 status->pr_statussz = sizeof(elf_prstatus_t); 1980 status->pr_gregsetsz = sizeof(elf_gregset_t); 1981 status->pr_fpregsetsz = sizeof(elf_fpregset_t); 1982 status->pr_osreldate = osreldate; 1983 status->pr_cursig = td->td_proc->p_sig; 1984 status->pr_pid = td->td_tid; 1985 #if defined(COMPAT_FREEBSD32) && __ELF_WORD_SIZE == 32 1986 fill_regs32(td, &status->pr_reg); 1987 #else 1988 fill_regs(td, &status->pr_reg); 1989 #endif 1990 sbuf_bcat(sb, status, sizeof(*status)); 1991 free(status, M_TEMP); 1992 } 1993 *sizep = sizeof(*status); 1994 } 1995 1996 static void 1997 __elfN(note_fpregset)(void *arg, struct sbuf *sb, size_t *sizep) 1998 { 1999 struct thread *td; 2000 elf_prfpregset_t *fpregset; 2001 2002 td = (struct thread *)arg; 2003 if (sb != NULL) { 2004 KASSERT(*sizep == sizeof(*fpregset), ("invalid size")); 2005 fpregset = malloc(sizeof(*fpregset), M_TEMP, M_ZERO | M_WAITOK); 2006 #if defined(COMPAT_FREEBSD32) && __ELF_WORD_SIZE == 32 2007 fill_fpregs32(td, fpregset); 2008 #else 2009 fill_fpregs(td, fpregset); 2010 #endif 2011 sbuf_bcat(sb, fpregset, sizeof(*fpregset)); 2012 free(fpregset, M_TEMP); 2013 } 2014 *sizep = sizeof(*fpregset); 2015 } 2016 2017 static void 2018 __elfN(note_thrmisc)(void *arg, struct sbuf *sb, size_t *sizep) 2019 { 2020 struct thread *td; 2021 elf_thrmisc_t thrmisc; 2022 2023 td = (struct thread *)arg; 2024 if (sb != NULL) { 2025 KASSERT(*sizep == sizeof(thrmisc), ("invalid size")); 2026 bzero(&thrmisc._pad, sizeof(thrmisc._pad)); 2027 strcpy(thrmisc.pr_tname, td->td_name); 2028 sbuf_bcat(sb, &thrmisc, sizeof(thrmisc)); 2029 } 2030 *sizep = sizeof(thrmisc); 2031 } 2032 2033 static void 2034 __elfN(note_ptlwpinfo)(void *arg, struct sbuf *sb, size_t *sizep) 2035 { 2036 struct thread *td; 2037 size_t size; 2038 int structsize; 2039 #if defined(COMPAT_FREEBSD32) && __ELF_WORD_SIZE == 32 2040 struct ptrace_lwpinfo32 pl; 2041 #else 2042 struct ptrace_lwpinfo pl; 2043 #endif 2044 2045 td = (struct thread *)arg; 2046 size = sizeof(structsize) + sizeof(pl); 2047 if (sb != NULL) { 2048 KASSERT(*sizep == size, ("invalid size")); 2049 structsize = sizeof(pl); 2050 sbuf_bcat(sb, &structsize, sizeof(structsize)); 2051 bzero(&pl, sizeof(pl)); 2052 pl.pl_lwpid = td->td_tid; 2053 pl.pl_event = PL_EVENT_NONE; 2054 pl.pl_sigmask = td->td_sigmask; 2055 pl.pl_siglist = td->td_siglist; 2056 if (td->td_si.si_signo != 0) { 2057 pl.pl_event = PL_EVENT_SIGNAL; 2058 pl.pl_flags |= PL_FLAG_SI; 2059 #if defined(COMPAT_FREEBSD32) && __ELF_WORD_SIZE == 32 2060 siginfo_to_siginfo32(&td->td_si, &pl.pl_siginfo); 2061 #else 2062 pl.pl_siginfo = td->td_si; 2063 #endif 2064 } 2065 strcpy(pl.pl_tdname, td->td_name); 2066 /* XXX TODO: supply more information in struct ptrace_lwpinfo*/ 2067 sbuf_bcat(sb, &pl, sizeof(pl)); 2068 } 2069 *sizep = size; 2070 } 2071 2072 /* 2073 * Allow for MD specific notes, as well as any MD 2074 * specific preparations for writing MI notes. 2075 */ 2076 static void 2077 __elfN(note_threadmd)(void *arg, struct sbuf *sb, size_t *sizep) 2078 { 2079 struct thread *td; 2080 void *buf; 2081 size_t size; 2082 2083 td = (struct thread *)arg; 2084 size = *sizep; 2085 if (size != 0 && sb != NULL) 2086 buf = malloc(size, M_TEMP, M_ZERO | M_WAITOK); 2087 else 2088 buf = NULL; 2089 size = 0; 2090 __elfN(dump_thread)(td, buf, &size); 2091 KASSERT(sb == NULL || *sizep == size, ("invalid size")); 2092 if (size != 0 && sb != NULL) 2093 sbuf_bcat(sb, buf, size); 2094 free(buf, M_TEMP); 2095 *sizep = size; 2096 } 2097 2098 #ifdef KINFO_PROC_SIZE 2099 CTASSERT(sizeof(struct kinfo_proc) == KINFO_PROC_SIZE); 2100 #endif 2101 2102 static void 2103 __elfN(note_procstat_proc)(void *arg, struct sbuf *sb, size_t *sizep) 2104 { 2105 struct proc *p; 2106 size_t size; 2107 int structsize; 2108 2109 p = (struct proc *)arg; 2110 size = sizeof(structsize) + p->p_numthreads * 2111 sizeof(elf_kinfo_proc_t); 2112 2113 if (sb != NULL) { 2114 KASSERT(*sizep == size, ("invalid size")); 2115 structsize = sizeof(elf_kinfo_proc_t); 2116 sbuf_bcat(sb, &structsize, sizeof(structsize)); 2117 sx_slock(&proctree_lock); 2118 PROC_LOCK(p); 2119 kern_proc_out(p, sb, ELF_KERN_PROC_MASK); 2120 sx_sunlock(&proctree_lock); 2121 } 2122 *sizep = size; 2123 } 2124 2125 #ifdef KINFO_FILE_SIZE 2126 CTASSERT(sizeof(struct kinfo_file) == KINFO_FILE_SIZE); 2127 #endif 2128 2129 static void 2130 note_procstat_files(void *arg, struct sbuf *sb, size_t *sizep) 2131 { 2132 struct proc *p; 2133 size_t size, sect_sz, i; 2134 ssize_t start_len, sect_len; 2135 int structsize, filedesc_flags; 2136 2137 if (coredump_pack_fileinfo) 2138 filedesc_flags = KERN_FILEDESC_PACK_KINFO; 2139 else 2140 filedesc_flags = 0; 2141 2142 p = (struct proc *)arg; 2143 structsize = sizeof(struct kinfo_file); 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 PROC_LOCK(p); 2150 kern_proc_filedesc_out(p, sb, -1, filedesc_flags); 2151 sbuf_finish(sb); 2152 sbuf_delete(sb); 2153 *sizep = size; 2154 } else { 2155 sbuf_start_section(sb, &start_len); 2156 2157 sbuf_bcat(sb, &structsize, sizeof(structsize)); 2158 PROC_LOCK(p); 2159 kern_proc_filedesc_out(p, sb, *sizep - sizeof(structsize), 2160 filedesc_flags); 2161 2162 sect_len = sbuf_end_section(sb, start_len, 0, 0); 2163 if (sect_len < 0) 2164 return; 2165 sect_sz = sect_len; 2166 2167 KASSERT(sect_sz <= *sizep, 2168 ("kern_proc_filedesc_out did not respect maxlen; " 2169 "requested %zu, got %zu", *sizep - sizeof(structsize), 2170 sect_sz - sizeof(structsize))); 2171 2172 for (i = 0; i < *sizep - sect_sz && sb->s_error == 0; i++) 2173 sbuf_putc(sb, 0); 2174 } 2175 } 2176 2177 #ifdef KINFO_VMENTRY_SIZE 2178 CTASSERT(sizeof(struct kinfo_vmentry) == KINFO_VMENTRY_SIZE); 2179 #endif 2180 2181 static void 2182 note_procstat_vmmap(void *arg, struct sbuf *sb, size_t *sizep) 2183 { 2184 struct proc *p; 2185 size_t size; 2186 int structsize, vmmap_flags; 2187 2188 if (coredump_pack_vmmapinfo) 2189 vmmap_flags = KERN_VMMAP_PACK_KINFO; 2190 else 2191 vmmap_flags = 0; 2192 2193 p = (struct proc *)arg; 2194 structsize = sizeof(struct kinfo_vmentry); 2195 if (sb == NULL) { 2196 size = 0; 2197 sb = sbuf_new(NULL, NULL, 128, SBUF_FIXEDLEN); 2198 sbuf_set_drain(sb, sbuf_drain_count, &size); 2199 sbuf_bcat(sb, &structsize, sizeof(structsize)); 2200 PROC_LOCK(p); 2201 kern_proc_vmmap_out(p, sb, -1, vmmap_flags); 2202 sbuf_finish(sb); 2203 sbuf_delete(sb); 2204 *sizep = size; 2205 } else { 2206 sbuf_bcat(sb, &structsize, sizeof(structsize)); 2207 PROC_LOCK(p); 2208 kern_proc_vmmap_out(p, sb, *sizep - sizeof(structsize), 2209 vmmap_flags); 2210 } 2211 } 2212 2213 static void 2214 note_procstat_groups(void *arg, struct sbuf *sb, size_t *sizep) 2215 { 2216 struct proc *p; 2217 size_t size; 2218 int structsize; 2219 2220 p = (struct proc *)arg; 2221 size = sizeof(structsize) + p->p_ucred->cr_ngroups * sizeof(gid_t); 2222 if (sb != NULL) { 2223 KASSERT(*sizep == size, ("invalid size")); 2224 structsize = sizeof(gid_t); 2225 sbuf_bcat(sb, &structsize, sizeof(structsize)); 2226 sbuf_bcat(sb, p->p_ucred->cr_groups, p->p_ucred->cr_ngroups * 2227 sizeof(gid_t)); 2228 } 2229 *sizep = size; 2230 } 2231 2232 static void 2233 note_procstat_umask(void *arg, struct sbuf *sb, size_t *sizep) 2234 { 2235 struct proc *p; 2236 size_t size; 2237 int structsize; 2238 2239 p = (struct proc *)arg; 2240 size = sizeof(structsize) + sizeof(p->p_fd->fd_cmask); 2241 if (sb != NULL) { 2242 KASSERT(*sizep == size, ("invalid size")); 2243 structsize = sizeof(p->p_fd->fd_cmask); 2244 sbuf_bcat(sb, &structsize, sizeof(structsize)); 2245 sbuf_bcat(sb, &p->p_fd->fd_cmask, sizeof(p->p_fd->fd_cmask)); 2246 } 2247 *sizep = size; 2248 } 2249 2250 static void 2251 note_procstat_rlimit(void *arg, struct sbuf *sb, size_t *sizep) 2252 { 2253 struct proc *p; 2254 struct rlimit rlim[RLIM_NLIMITS]; 2255 size_t size; 2256 int structsize, i; 2257 2258 p = (struct proc *)arg; 2259 size = sizeof(structsize) + sizeof(rlim); 2260 if (sb != NULL) { 2261 KASSERT(*sizep == size, ("invalid size")); 2262 structsize = sizeof(rlim); 2263 sbuf_bcat(sb, &structsize, sizeof(structsize)); 2264 PROC_LOCK(p); 2265 for (i = 0; i < RLIM_NLIMITS; i++) 2266 lim_rlimit_proc(p, i, &rlim[i]); 2267 PROC_UNLOCK(p); 2268 sbuf_bcat(sb, rlim, sizeof(rlim)); 2269 } 2270 *sizep = size; 2271 } 2272 2273 static void 2274 note_procstat_osrel(void *arg, struct sbuf *sb, size_t *sizep) 2275 { 2276 struct proc *p; 2277 size_t size; 2278 int structsize; 2279 2280 p = (struct proc *)arg; 2281 size = sizeof(structsize) + sizeof(p->p_osrel); 2282 if (sb != NULL) { 2283 KASSERT(*sizep == size, ("invalid size")); 2284 structsize = sizeof(p->p_osrel); 2285 sbuf_bcat(sb, &structsize, sizeof(structsize)); 2286 sbuf_bcat(sb, &p->p_osrel, sizeof(p->p_osrel)); 2287 } 2288 *sizep = size; 2289 } 2290 2291 static void 2292 __elfN(note_procstat_psstrings)(void *arg, struct sbuf *sb, size_t *sizep) 2293 { 2294 struct proc *p; 2295 elf_ps_strings_t ps_strings; 2296 size_t size; 2297 int structsize; 2298 2299 p = (struct proc *)arg; 2300 size = sizeof(structsize) + sizeof(ps_strings); 2301 if (sb != NULL) { 2302 KASSERT(*sizep == size, ("invalid size")); 2303 structsize = sizeof(ps_strings); 2304 #if defined(COMPAT_FREEBSD32) && __ELF_WORD_SIZE == 32 2305 ps_strings = PTROUT(p->p_sysent->sv_psstrings); 2306 #else 2307 ps_strings = p->p_sysent->sv_psstrings; 2308 #endif 2309 sbuf_bcat(sb, &structsize, sizeof(structsize)); 2310 sbuf_bcat(sb, &ps_strings, sizeof(ps_strings)); 2311 } 2312 *sizep = size; 2313 } 2314 2315 static void 2316 __elfN(note_procstat_auxv)(void *arg, struct sbuf *sb, size_t *sizep) 2317 { 2318 struct proc *p; 2319 size_t size; 2320 int structsize; 2321 2322 p = (struct proc *)arg; 2323 if (sb == NULL) { 2324 size = 0; 2325 sb = sbuf_new(NULL, NULL, 128, SBUF_FIXEDLEN); 2326 sbuf_set_drain(sb, sbuf_drain_count, &size); 2327 sbuf_bcat(sb, &structsize, sizeof(structsize)); 2328 PHOLD(p); 2329 proc_getauxv(curthread, p, sb); 2330 PRELE(p); 2331 sbuf_finish(sb); 2332 sbuf_delete(sb); 2333 *sizep = size; 2334 } else { 2335 structsize = sizeof(Elf_Auxinfo); 2336 sbuf_bcat(sb, &structsize, sizeof(structsize)); 2337 PHOLD(p); 2338 proc_getauxv(curthread, p, sb); 2339 PRELE(p); 2340 } 2341 } 2342 2343 static boolean_t 2344 __elfN(parse_notes)(struct image_params *imgp, Elf_Brandnote *checknote, 2345 int32_t *osrel, const Elf_Phdr *pnote) 2346 { 2347 const Elf_Note *note, *note0, *note_end; 2348 const char *note_name; 2349 char *buf; 2350 int i, error; 2351 boolean_t res; 2352 2353 /* We need some limit, might as well use PAGE_SIZE. */ 2354 if (pnote == NULL || pnote->p_filesz > PAGE_SIZE) 2355 return (FALSE); 2356 ASSERT_VOP_LOCKED(imgp->vp, "parse_notes"); 2357 if (pnote->p_offset > PAGE_SIZE || 2358 pnote->p_filesz > PAGE_SIZE - pnote->p_offset) { 2359 VOP_UNLOCK(imgp->vp, 0); 2360 buf = malloc(pnote->p_filesz, M_TEMP, M_WAITOK); 2361 vn_lock(imgp->vp, LK_EXCLUSIVE | LK_RETRY); 2362 error = vn_rdwr(UIO_READ, imgp->vp, buf, pnote->p_filesz, 2363 pnote->p_offset, UIO_SYSSPACE, IO_NODELOCKED, 2364 curthread->td_ucred, NOCRED, NULL, curthread); 2365 if (error != 0) { 2366 uprintf("i/o error PT_NOTE\n"); 2367 res = FALSE; 2368 goto ret; 2369 } 2370 note = note0 = (const Elf_Note *)buf; 2371 note_end = (const Elf_Note *)(buf + pnote->p_filesz); 2372 } else { 2373 note = note0 = (const Elf_Note *)(imgp->image_header + 2374 pnote->p_offset); 2375 note_end = (const Elf_Note *)(imgp->image_header + 2376 pnote->p_offset + pnote->p_filesz); 2377 buf = NULL; 2378 } 2379 for (i = 0; i < 100 && note >= note0 && note < note_end; i++) { 2380 if (!aligned(note, Elf32_Addr) || (const char *)note_end - 2381 (const char *)note < sizeof(Elf_Note)) { 2382 res = FALSE; 2383 goto ret; 2384 } 2385 if (note->n_namesz != checknote->hdr.n_namesz || 2386 note->n_descsz != checknote->hdr.n_descsz || 2387 note->n_type != checknote->hdr.n_type) 2388 goto nextnote; 2389 note_name = (const char *)(note + 1); 2390 if (note_name + checknote->hdr.n_namesz >= 2391 (const char *)note_end || strncmp(checknote->vendor, 2392 note_name, checknote->hdr.n_namesz) != 0) 2393 goto nextnote; 2394 2395 /* 2396 * Fetch the osreldate for binary 2397 * from the ELF OSABI-note if necessary. 2398 */ 2399 if ((checknote->flags & BN_TRANSLATE_OSREL) != 0 && 2400 checknote->trans_osrel != NULL) { 2401 res = checknote->trans_osrel(note, osrel); 2402 goto ret; 2403 } 2404 res = TRUE; 2405 goto ret; 2406 nextnote: 2407 note = (const Elf_Note *)((const char *)(note + 1) + 2408 roundup2(note->n_namesz, ELF_NOTE_ROUNDSIZE) + 2409 roundup2(note->n_descsz, ELF_NOTE_ROUNDSIZE)); 2410 } 2411 res = FALSE; 2412 ret: 2413 free(buf, M_TEMP); 2414 return (res); 2415 } 2416 2417 /* 2418 * Try to find the appropriate ABI-note section for checknote, 2419 * fetch the osreldate for binary from the ELF OSABI-note. Only the 2420 * first page of the image is searched, the same as for headers. 2421 */ 2422 static boolean_t 2423 __elfN(check_note)(struct image_params *imgp, Elf_Brandnote *checknote, 2424 int32_t *osrel) 2425 { 2426 const Elf_Phdr *phdr; 2427 const Elf_Ehdr *hdr; 2428 int i; 2429 2430 hdr = (const Elf_Ehdr *)imgp->image_header; 2431 phdr = (const Elf_Phdr *)(imgp->image_header + hdr->e_phoff); 2432 2433 for (i = 0; i < hdr->e_phnum; i++) { 2434 if (phdr[i].p_type == PT_NOTE && 2435 __elfN(parse_notes)(imgp, checknote, osrel, &phdr[i])) 2436 return (TRUE); 2437 } 2438 return (FALSE); 2439 2440 } 2441 2442 /* 2443 * Tell kern_execve.c about it, with a little help from the linker. 2444 */ 2445 static struct execsw __elfN(execsw) = { 2446 .ex_imgact = __CONCAT(exec_, __elfN(imgact)), 2447 .ex_name = __XSTRING(__CONCAT(ELF, __ELF_WORD_SIZE)) 2448 }; 2449 EXEC_SET(__CONCAT(elf, __ELF_WORD_SIZE), __elfN(execsw)); 2450 2451 static vm_prot_t 2452 __elfN(trans_prot)(Elf_Word flags) 2453 { 2454 vm_prot_t prot; 2455 2456 prot = 0; 2457 if (flags & PF_X) 2458 prot |= VM_PROT_EXECUTE; 2459 if (flags & PF_W) 2460 prot |= VM_PROT_WRITE; 2461 if (flags & PF_R) 2462 prot |= VM_PROT_READ; 2463 #if __ELF_WORD_SIZE == 32 2464 #if defined(__amd64__) 2465 if (i386_read_exec && (flags & PF_R)) 2466 prot |= VM_PROT_EXECUTE; 2467 #endif 2468 #endif 2469 return (prot); 2470 } 2471 2472 static Elf_Word 2473 __elfN(untrans_prot)(vm_prot_t prot) 2474 { 2475 Elf_Word flags; 2476 2477 flags = 0; 2478 if (prot & VM_PROT_EXECUTE) 2479 flags |= PF_X; 2480 if (prot & VM_PROT_READ) 2481 flags |= PF_R; 2482 if (prot & VM_PROT_WRITE) 2483 flags |= PF_W; 2484 return (flags); 2485 } 2486