Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]
FreeBSD/Linux Kernel Cross Reference
sys/kern/imgact_elf.c
Version:
- FREEBSD - FREEBSD-13-STABLE - FREEBSD-13-0 - FREEBSD-12-STABLE - FREEBSD-12-0 - FREEBSD-11-STABLE - FREEBSD-11-0 - FREEBSD-10-STABLE - FREEBSD-10-0 - FREEBSD-9-STABLE - FREEBSD-9-0 - FREEBSD-8-STABLE - FREEBSD-8-0 - FREEBSD-7-STABLE - FREEBSD-7-0 - FREEBSD-6-STABLE - FREEBSD-6-0 - FREEBSD-5-STABLE - FREEBSD-5-0 - FREEBSD-4-STABLE - FREEBSD-3-STABLE - FREEBSD22 - l41 - OPENBSD - linux-2.6 - MK84 - PLAN9 - xnu-8792
SearchContext: - none - 3 - 10
SearchContext: - none - 3 - 10
1 /*- 2 * Copyright (c) 2017 Dell EMC 3 * Copyright (c) 2000 David O'Brien 4 * Copyright (c) 1995-1996 Søren Schmidt 5 * Copyright (c) 1996 Peter Wemm 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer 13 * in this position and unchanged. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 3. The name of the author may not be used to endorse or promote products 18 * derived from this software without specific prior written permission 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 21 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 22 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 23 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 24 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 25 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 26 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 27 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 28 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 29 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32 #include <sys/cdefs.h> 33 __FBSDID("$FreeBSD: releng/11.2/sys/kern/imgact_elf.c 338606 2018-09-12 05:07:35Z gordon $"); 34 35 #include "opt_capsicum.h" 36 #include "opt_compat.h" 37 #include "opt_gzio.h" 38 39 #include <sys/param.h> 40 #include <sys/capsicum.h> 41 #include <sys/exec.h> 42 #include <sys/fcntl.h> 43 #include <sys/gzio.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 boolean_t __elfN(freebsd_trans_osrel)(const Elf_Note *note, 99 int32_t *osrel); 100 static boolean_t 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 boolean_t 158 __elfN(freebsd_trans_osrel)(const Elf_Note *note, int32_t *osrel) 159 { 160 uintptr_t p; 161 162 p = (uintptr_t)(note + 1); 163 p += roundup2(note->n_namesz, ELF_NOTE_ROUNDSIZE); 164 *osrel = *(const int32_t *)(p); 165 166 return (TRUE); 167 } 168 169 static const char GNU_ABI_VENDOR[] = "GNU"; 170 static int GNU_KFREEBSD_ABI_DESC = 3; 171 172 Elf_Brandnote __elfN(kfreebsd_brandnote) = { 173 .hdr.n_namesz = sizeof(GNU_ABI_VENDOR), 174 .hdr.n_descsz = 16, /* XXX at least 16 */ 175 .hdr.n_type = 1, 176 .vendor = GNU_ABI_VENDOR, 177 .flags = BN_TRANSLATE_OSREL, 178 .trans_osrel = kfreebsd_trans_osrel 179 }; 180 181 static boolean_t 182 kfreebsd_trans_osrel(const Elf_Note *note, int32_t *osrel) 183 { 184 const Elf32_Word *desc; 185 uintptr_t p; 186 187 p = (uintptr_t)(note + 1); 188 p += roundup2(note->n_namesz, ELF_NOTE_ROUNDSIZE); 189 190 desc = (const Elf32_Word *)p; 191 if (desc[0] != GNU_KFREEBSD_ABI_DESC) 192 return (FALSE); 193 194 /* 195 * Debian GNU/kFreeBSD embed the earliest compatible kernel version 196 * (__FreeBSD_version: <major><two digit minor>Rxx) in the LSB way. 197 */ 198 *osrel = desc[1] * 100000 + desc[2] * 1000 + desc[3]; 199 200 return (TRUE); 201 } 202 203 int 204 __elfN(insert_brand_entry)(Elf_Brandinfo *entry) 205 { 206 int i; 207 208 for (i = 0; i < MAX_BRANDS; i++) { 209 if (elf_brand_list[i] == NULL) { 210 elf_brand_list[i] = entry; 211 break; 212 } 213 } 214 if (i == MAX_BRANDS) { 215 printf("WARNING: %s: could not insert brandinfo entry: %p\n", 216 __func__, entry); 217 return (-1); 218 } 219 return (0); 220 } 221 222 int 223 __elfN(remove_brand_entry)(Elf_Brandinfo *entry) 224 { 225 int i; 226 227 for (i = 0; i < MAX_BRANDS; i++) { 228 if (elf_brand_list[i] == entry) { 229 elf_brand_list[i] = NULL; 230 break; 231 } 232 } 233 if (i == MAX_BRANDS) 234 return (-1); 235 return (0); 236 } 237 238 int 239 __elfN(brand_inuse)(Elf_Brandinfo *entry) 240 { 241 struct proc *p; 242 int rval = FALSE; 243 244 sx_slock(&allproc_lock); 245 FOREACH_PROC_IN_SYSTEM(p) { 246 if (p->p_sysent == entry->sysvec) { 247 rval = TRUE; 248 break; 249 } 250 } 251 sx_sunlock(&allproc_lock); 252 253 return (rval); 254 } 255 256 static Elf_Brandinfo * 257 __elfN(get_brandinfo)(struct image_params *imgp, const char *interp, 258 int interp_name_len, int32_t *osrel) 259 { 260 const Elf_Ehdr *hdr = (const Elf_Ehdr *)imgp->image_header; 261 Elf_Brandinfo *bi, *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 < 2 || 843 phdr[i].p_filesz > MAXPATHLEN) { 844 uprintf("Invalid PT_INTERP\n"); 845 error = ENOEXEC; 846 goto ret; 847 } 848 if (interp != NULL) { 849 uprintf("Multiple PT_INTERP headers\n"); 850 error = ENOEXEC; 851 goto ret; 852 } 853 interp_name_len = phdr[i].p_filesz; 854 if (phdr[i].p_offset > PAGE_SIZE || 855 interp_name_len > PAGE_SIZE - phdr[i].p_offset) { 856 VOP_UNLOCK(imgp->vp, 0); 857 interp_buf = malloc(interp_name_len + 1, M_TEMP, 858 M_WAITOK); 859 vn_lock(imgp->vp, LK_EXCLUSIVE | LK_RETRY); 860 error = vn_rdwr(UIO_READ, imgp->vp, interp_buf, 861 interp_name_len, phdr[i].p_offset, 862 UIO_SYSSPACE, IO_NODELOCKED, td->td_ucred, 863 NOCRED, NULL, td); 864 if (error != 0) { 865 uprintf("i/o error PT_INTERP\n"); 866 goto ret; 867 } 868 interp_buf[interp_name_len] = '\0'; 869 interp = interp_buf; 870 } else { 871 interp = __DECONST(char *, imgp->image_header) + 872 phdr[i].p_offset; 873 if (interp[interp_name_len - 1] != '\0') { 874 uprintf("Invalid PT_INTERP\n"); 875 error = ENOEXEC; 876 goto ret; 877 } 878 } 879 break; 880 case PT_GNU_STACK: 881 if (__elfN(nxstack)) 882 imgp->stack_prot = 883 __elfN(trans_prot)(phdr[i].p_flags); 884 imgp->stack_sz = phdr[i].p_memsz; 885 break; 886 } 887 } 888 889 brand_info = __elfN(get_brandinfo)(imgp, interp, interp_name_len, 890 &osrel); 891 if (brand_info == NULL) { 892 uprintf("ELF binary type \"%u\" not known.\n", 893 hdr->e_ident[EI_OSABI]); 894 error = ENOEXEC; 895 goto ret; 896 } 897 if (hdr->e_type == ET_DYN) { 898 if ((brand_info->flags & BI_CAN_EXEC_DYN) == 0) { 899 uprintf("Cannot execute shared object\n"); 900 error = ENOEXEC; 901 goto ret; 902 } 903 /* 904 * Honour the base load address from the dso if it is 905 * non-zero for some reason. 906 */ 907 if (baddr == 0) 908 et_dyn_addr = ET_DYN_LOAD_ADDR; 909 else 910 et_dyn_addr = 0; 911 } else 912 et_dyn_addr = 0; 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_Addr *base; 1110 Elf_Addr *pos; 1111 1112 base = (Elf_Addr *)*stack_base; 1113 pos = base + (imgp->args->argc + imgp->args->envc + 2); 1114 1115 if (args->execfd != -1) 1116 AUXARGS_ENTRY(pos, AT_EXECFD, args->execfd); 1117 AUXARGS_ENTRY(pos, AT_PHDR, args->phdr); 1118 AUXARGS_ENTRY(pos, AT_PHENT, args->phent); 1119 AUXARGS_ENTRY(pos, AT_PHNUM, args->phnum); 1120 AUXARGS_ENTRY(pos, AT_PAGESZ, args->pagesz); 1121 AUXARGS_ENTRY(pos, AT_FLAGS, args->flags); 1122 AUXARGS_ENTRY(pos, AT_ENTRY, args->entry); 1123 AUXARGS_ENTRY(pos, AT_BASE, args->base); 1124 AUXARGS_ENTRY(pos, AT_EHDRFLAGS, args->hdr_eflags); 1125 if (imgp->execpathp != 0) 1126 AUXARGS_ENTRY(pos, AT_EXECPATH, imgp->execpathp); 1127 AUXARGS_ENTRY(pos, AT_OSRELDATE, 1128 imgp->proc->p_ucred->cr_prison->pr_osreldate); 1129 if (imgp->canary != 0) { 1130 AUXARGS_ENTRY(pos, AT_CANARY, imgp->canary); 1131 AUXARGS_ENTRY(pos, AT_CANARYLEN, imgp->canarylen); 1132 } 1133 AUXARGS_ENTRY(pos, AT_NCPUS, mp_ncpus); 1134 if (imgp->pagesizes != 0) { 1135 AUXARGS_ENTRY(pos, AT_PAGESIZES, imgp->pagesizes); 1136 AUXARGS_ENTRY(pos, AT_PAGESIZESLEN, imgp->pagesizeslen); 1137 } 1138 if (imgp->sysent->sv_timekeep_base != 0) { 1139 AUXARGS_ENTRY(pos, AT_TIMEKEEP, 1140 imgp->sysent->sv_timekeep_base); 1141 } 1142 AUXARGS_ENTRY(pos, AT_STACKPROT, imgp->sysent->sv_shared_page_obj 1143 != NULL && imgp->stack_prot != 0 ? imgp->stack_prot : 1144 imgp->sysent->sv_stackprot); 1145 if ((imgp->sysent->sv_flags & SV_HWCAP) != 0) { 1146 if (imgp->sysent->sv_hwcap != NULL) 1147 AUXARGS_ENTRY(pos, AT_HWCAP, *imgp->sysent->sv_hwcap); 1148 if (imgp->sysent->sv_hwcap2 != NULL) 1149 AUXARGS_ENTRY(pos, AT_HWCAP2, *imgp->sysent->sv_hwcap2); 1150 } 1151 AUXARGS_ENTRY(pos, AT_NULL, 0); 1152 1153 free(imgp->auxargs, M_TEMP); 1154 imgp->auxargs = NULL; 1155 1156 base--; 1157 suword(base, (long)imgp->args->argc); 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 gzio_stream *gzs; 1200 }; 1201 1202 static void cb_put_phdr(vm_map_entry_t, void *); 1203 static void cb_size_segment(vm_map_entry_t, void *); 1204 static int core_write(struct coredump_params *, const void *, size_t, off_t, 1205 enum uio_seg); 1206 static void each_writable_segment(struct thread *, segment_callback, void *); 1207 static int __elfN(corehdr)(struct coredump_params *, int, void *, size_t, 1208 struct note_info_list *, size_t); 1209 static void __elfN(prepare_notes)(struct thread *, struct note_info_list *, 1210 size_t *); 1211 static void __elfN(puthdr)(struct thread *, void *, size_t, int, size_t); 1212 static void __elfN(putnote)(struct note_info *, struct sbuf *); 1213 static size_t register_note(struct note_info_list *, int, outfunc_t, void *); 1214 static int sbuf_drain_core_output(void *, const char *, int); 1215 static int sbuf_drain_count(void *arg, const char *data, int len); 1216 1217 static void __elfN(note_fpregset)(void *, struct sbuf *, size_t *); 1218 static void __elfN(note_prpsinfo)(void *, struct sbuf *, size_t *); 1219 static void __elfN(note_prstatus)(void *, struct sbuf *, size_t *); 1220 static void __elfN(note_threadmd)(void *, struct sbuf *, size_t *); 1221 static void __elfN(note_thrmisc)(void *, struct sbuf *, size_t *); 1222 static void __elfN(note_ptlwpinfo)(void *, struct sbuf *, size_t *); 1223 static void __elfN(note_procstat_auxv)(void *, struct sbuf *, size_t *); 1224 static void __elfN(note_procstat_proc)(void *, struct sbuf *, size_t *); 1225 static void __elfN(note_procstat_psstrings)(void *, struct sbuf *, size_t *); 1226 static void note_procstat_files(void *, struct sbuf *, size_t *); 1227 static void note_procstat_groups(void *, struct sbuf *, size_t *); 1228 static void note_procstat_osrel(void *, struct sbuf *, size_t *); 1229 static void note_procstat_rlimit(void *, struct sbuf *, size_t *); 1230 static void note_procstat_umask(void *, struct sbuf *, size_t *); 1231 static void note_procstat_vmmap(void *, struct sbuf *, size_t *); 1232 1233 #ifdef GZIO 1234 extern int compress_user_cores_gzlevel; 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 = gzio_write(p->gzs, 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_gz_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 #endif /* GZIO */ 1272 1273 static int 1274 core_write(struct coredump_params *p, const void *base, size_t len, 1275 off_t offset, enum uio_seg seg) 1276 { 1277 1278 return (vn_rdwr_inchunks(UIO_WRITE, p->vp, __DECONST(void *, base), 1279 len, offset, seg, IO_UNIT | IO_DIRECT | IO_RANGELOCKED, 1280 p->active_cred, p->file_cred, NULL, p->td)); 1281 } 1282 1283 static int 1284 core_output(void *base, size_t len, off_t offset, struct coredump_params *p, 1285 void *tmpbuf) 1286 { 1287 int error; 1288 1289 #ifdef GZIO 1290 if (p->gzs != NULL) 1291 return (compress_chunk(p, base, tmpbuf, len)); 1292 #endif 1293 /* 1294 * EFAULT is a non-fatal error that we can get, for example, 1295 * if the segment is backed by a file but extends beyond its 1296 * end. 1297 */ 1298 error = core_write(p, base, len, offset, UIO_USERSPACE); 1299 if (error == EFAULT) { 1300 log(LOG_WARNING, "Failed to fully fault in a core file segment " 1301 "at VA %p with size 0x%zx to be written at offset 0x%jx " 1302 "for process %s\n", base, len, offset, curproc->p_comm); 1303 1304 /* 1305 * Write a "real" zero byte at the end of the target region 1306 * in the case this is the last segment. 1307 * The intermediate space will be implicitly zero-filled. 1308 */ 1309 error = core_write(p, zero_region, 1, offset + len - 1, 1310 UIO_SYSSPACE); 1311 } 1312 return (error); 1313 } 1314 1315 /* 1316 * Drain into a core file. 1317 */ 1318 static int 1319 sbuf_drain_core_output(void *arg, const char *data, int len) 1320 { 1321 struct coredump_params *p; 1322 int error, locked; 1323 1324 p = (struct coredump_params *)arg; 1325 1326 /* 1327 * Some kern_proc out routines that print to this sbuf may 1328 * call us with the process lock held. Draining with the 1329 * non-sleepable lock held is unsafe. The lock is needed for 1330 * those routines when dumping a live process. In our case we 1331 * can safely release the lock before draining and acquire 1332 * again after. 1333 */ 1334 locked = PROC_LOCKED(p->td->td_proc); 1335 if (locked) 1336 PROC_UNLOCK(p->td->td_proc); 1337 #ifdef GZIO 1338 if (p->gzs != NULL) 1339 error = gzio_write(p->gzs, __DECONST(char *, data), len); 1340 else 1341 #endif 1342 error = core_write(p, __DECONST(void *, data), len, p->offset, 1343 UIO_SYSSPACE); 1344 if (locked) 1345 PROC_LOCK(p->td->td_proc); 1346 if (error != 0) 1347 return (-error); 1348 p->offset += len; 1349 return (len); 1350 } 1351 1352 /* 1353 * Drain into a counter. 1354 */ 1355 static int 1356 sbuf_drain_count(void *arg, const char *data __unused, int len) 1357 { 1358 size_t *sizep; 1359 1360 sizep = (size_t *)arg; 1361 *sizep += len; 1362 return (len); 1363 } 1364 1365 int 1366 __elfN(coredump)(struct thread *td, struct vnode *vp, off_t limit, int flags) 1367 { 1368 struct ucred *cred = td->td_ucred; 1369 int error = 0; 1370 struct sseg_closure seginfo; 1371 struct note_info_list notelst; 1372 struct coredump_params params; 1373 struct note_info *ninfo; 1374 void *hdr, *tmpbuf; 1375 size_t hdrsize, notesz, coresize; 1376 #ifdef GZIO 1377 boolean_t compress; 1378 1379 compress = (flags & IMGACT_CORE_COMPRESS) != 0; 1380 #endif 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_writable_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 __elfN(prepare_notes)(td, ¬elst, ¬esz); 1395 coresize = round_page(hdrsize + notesz) + seginfo.size; 1396 1397 /* Set up core dump parameters. */ 1398 params.offset = 0; 1399 params.active_cred = cred; 1400 params.file_cred = NOCRED; 1401 params.td = td; 1402 params.vp = vp; 1403 params.gzs = NULL; 1404 1405 #ifdef RACCT 1406 if (racct_enable) { 1407 PROC_LOCK(td->td_proc); 1408 error = racct_add(td->td_proc, RACCT_CORE, coresize); 1409 PROC_UNLOCK(td->td_proc); 1410 if (error != 0) { 1411 error = EFAULT; 1412 goto done; 1413 } 1414 } 1415 #endif 1416 if (coresize >= limit) { 1417 error = EFAULT; 1418 goto done; 1419 } 1420 1421 #ifdef GZIO 1422 /* Create a compression stream if necessary. */ 1423 if (compress) { 1424 params.gzs = gzio_init(core_gz_write, GZIO_DEFLATE, 1425 CORE_BUF_SIZE, compress_user_cores_gzlevel, ¶ms); 1426 if (params.gzs == NULL) { 1427 error = EFAULT; 1428 goto done; 1429 } 1430 tmpbuf = malloc(CORE_BUF_SIZE, M_TEMP, M_WAITOK | M_ZERO); 1431 } 1432 #endif 1433 1434 /* 1435 * Allocate memory for building the header, fill it up, 1436 * and write it out following the notes. 1437 */ 1438 hdr = malloc(hdrsize, M_TEMP, M_WAITOK); 1439 error = __elfN(corehdr)(¶ms, seginfo.count, hdr, hdrsize, ¬elst, 1440 notesz); 1441 1442 /* Write the contents of all of the writable segments. */ 1443 if (error == 0) { 1444 Elf_Phdr *php; 1445 off_t offset; 1446 int i; 1447 1448 php = (Elf_Phdr *)((char *)hdr + sizeof(Elf_Ehdr)) + 1; 1449 offset = round_page(hdrsize + notesz); 1450 for (i = 0; i < seginfo.count; i++) { 1451 error = core_output((caddr_t)(uintptr_t)php->p_vaddr, 1452 php->p_filesz, offset, ¶ms, tmpbuf); 1453 if (error != 0) 1454 break; 1455 offset += php->p_filesz; 1456 php++; 1457 } 1458 #ifdef GZIO 1459 if (error == 0 && compress) 1460 error = gzio_flush(params.gzs); 1461 #endif 1462 } 1463 if (error) { 1464 log(LOG_WARNING, 1465 "Failed to write core file for process %s (error %d)\n", 1466 curproc->p_comm, error); 1467 } 1468 1469 done: 1470 #ifdef GZIO 1471 if (compress) { 1472 free(tmpbuf, M_TEMP); 1473 if (params.gzs != NULL) 1474 gzio_fini(params.gzs); 1475 } 1476 #endif 1477 while ((ninfo = TAILQ_FIRST(¬elst)) != NULL) { 1478 TAILQ_REMOVE(¬elst, ninfo, link); 1479 free(ninfo, M_TEMP); 1480 } 1481 if (hdr != NULL) 1482 free(hdr, M_TEMP); 1483 1484 return (error); 1485 } 1486 1487 /* 1488 * A callback for each_writable_segment() to write out the segment's 1489 * program header entry. 1490 */ 1491 static void 1492 cb_put_phdr(entry, closure) 1493 vm_map_entry_t entry; 1494 void *closure; 1495 { 1496 struct phdr_closure *phc = (struct phdr_closure *)closure; 1497 Elf_Phdr *phdr = phc->phdr; 1498 1499 phc->offset = round_page(phc->offset); 1500 1501 phdr->p_type = PT_LOAD; 1502 phdr->p_offset = phc->offset; 1503 phdr->p_vaddr = entry->start; 1504 phdr->p_paddr = 0; 1505 phdr->p_filesz = phdr->p_memsz = entry->end - entry->start; 1506 phdr->p_align = PAGE_SIZE; 1507 phdr->p_flags = __elfN(untrans_prot)(entry->protection); 1508 1509 phc->offset += phdr->p_filesz; 1510 phc->phdr++; 1511 } 1512 1513 /* 1514 * A callback for each_writable_segment() to gather information about 1515 * the number of segments and their total size. 1516 */ 1517 static void 1518 cb_size_segment(entry, closure) 1519 vm_map_entry_t entry; 1520 void *closure; 1521 { 1522 struct sseg_closure *ssc = (struct sseg_closure *)closure; 1523 1524 ssc->count++; 1525 ssc->size += entry->end - entry->start; 1526 } 1527 1528 /* 1529 * For each writable segment in the process's memory map, call the given 1530 * function with a pointer to the map entry and some arbitrary 1531 * caller-supplied data. 1532 */ 1533 static void 1534 each_writable_segment(td, func, closure) 1535 struct thread *td; 1536 segment_callback func; 1537 void *closure; 1538 { 1539 struct proc *p = td->td_proc; 1540 vm_map_t map = &p->p_vmspace->vm_map; 1541 vm_map_entry_t entry; 1542 vm_object_t backing_object, object; 1543 boolean_t ignore_entry; 1544 1545 vm_map_lock_read(map); 1546 for (entry = map->header.next; entry != &map->header; 1547 entry = entry->next) { 1548 /* 1549 * Don't dump inaccessible mappings, deal with legacy 1550 * coredump mode. 1551 * 1552 * Note that read-only segments related to the elf binary 1553 * are marked MAP_ENTRY_NOCOREDUMP now so we no longer 1554 * need to arbitrarily ignore such segments. 1555 */ 1556 if (elf_legacy_coredump) { 1557 if ((entry->protection & VM_PROT_RW) != VM_PROT_RW) 1558 continue; 1559 } else { 1560 if ((entry->protection & VM_PROT_ALL) == 0) 1561 continue; 1562 } 1563 1564 /* 1565 * Dont include memory segment in the coredump if 1566 * MAP_NOCORE is set in mmap(2) or MADV_NOCORE in 1567 * madvise(2). Do not dump submaps (i.e. parts of the 1568 * kernel map). 1569 */ 1570 if (entry->eflags & (MAP_ENTRY_NOCOREDUMP|MAP_ENTRY_IS_SUB_MAP)) 1571 continue; 1572 1573 if ((object = entry->object.vm_object) == NULL) 1574 continue; 1575 1576 /* Ignore memory-mapped devices and such things. */ 1577 VM_OBJECT_RLOCK(object); 1578 while ((backing_object = object->backing_object) != NULL) { 1579 VM_OBJECT_RLOCK(backing_object); 1580 VM_OBJECT_RUNLOCK(object); 1581 object = backing_object; 1582 } 1583 ignore_entry = object->type != OBJT_DEFAULT && 1584 object->type != OBJT_SWAP && object->type != OBJT_VNODE && 1585 object->type != OBJT_PHYS; 1586 VM_OBJECT_RUNLOCK(object); 1587 if (ignore_entry) 1588 continue; 1589 1590 (*func)(entry, closure); 1591 } 1592 vm_map_unlock_read(map); 1593 } 1594 1595 /* 1596 * Write the core file header to the file, including padding up to 1597 * the page boundary. 1598 */ 1599 static int 1600 __elfN(corehdr)(struct coredump_params *p, int numsegs, void *hdr, 1601 size_t hdrsize, struct note_info_list *notelst, size_t notesz) 1602 { 1603 struct note_info *ninfo; 1604 struct sbuf *sb; 1605 int error; 1606 1607 /* Fill in the header. */ 1608 bzero(hdr, hdrsize); 1609 __elfN(puthdr)(p->td, hdr, hdrsize, numsegs, notesz); 1610 1611 sb = sbuf_new(NULL, NULL, CORE_BUF_SIZE, SBUF_FIXEDLEN); 1612 sbuf_set_drain(sb, sbuf_drain_core_output, p); 1613 sbuf_start_section(sb, NULL); 1614 sbuf_bcat(sb, hdr, hdrsize); 1615 TAILQ_FOREACH(ninfo, notelst, link) 1616 __elfN(putnote)(ninfo, sb); 1617 /* Align up to a page boundary for the program segments. */ 1618 sbuf_end_section(sb, -1, PAGE_SIZE, 0); 1619 error = sbuf_finish(sb); 1620 sbuf_delete(sb); 1621 1622 return (error); 1623 } 1624 1625 static void 1626 __elfN(prepare_notes)(struct thread *td, struct note_info_list *list, 1627 size_t *sizep) 1628 { 1629 struct proc *p; 1630 struct thread *thr; 1631 size_t size; 1632 1633 p = td->td_proc; 1634 size = 0; 1635 1636 size += register_note(list, NT_PRPSINFO, __elfN(note_prpsinfo), p); 1637 1638 /* 1639 * To have the debugger select the right thread (LWP) as the initial 1640 * thread, we dump the state of the thread passed to us in td first. 1641 * This is the thread that causes the core dump and thus likely to 1642 * be the right thread one wants to have selected in the debugger. 1643 */ 1644 thr = td; 1645 while (thr != NULL) { 1646 size += register_note(list, NT_PRSTATUS, 1647 __elfN(note_prstatus), thr); 1648 size += register_note(list, NT_FPREGSET, 1649 __elfN(note_fpregset), thr); 1650 size += register_note(list, NT_THRMISC, 1651 __elfN(note_thrmisc), thr); 1652 size += register_note(list, NT_PTLWPINFO, 1653 __elfN(note_ptlwpinfo), thr); 1654 size += register_note(list, -1, 1655 __elfN(note_threadmd), thr); 1656 1657 thr = (thr == td) ? TAILQ_FIRST(&p->p_threads) : 1658 TAILQ_NEXT(thr, td_plist); 1659 if (thr == td) 1660 thr = TAILQ_NEXT(thr, td_plist); 1661 } 1662 1663 size += register_note(list, NT_PROCSTAT_PROC, 1664 __elfN(note_procstat_proc), p); 1665 size += register_note(list, NT_PROCSTAT_FILES, 1666 note_procstat_files, p); 1667 size += register_note(list, NT_PROCSTAT_VMMAP, 1668 note_procstat_vmmap, p); 1669 size += register_note(list, NT_PROCSTAT_GROUPS, 1670 note_procstat_groups, p); 1671 size += register_note(list, NT_PROCSTAT_UMASK, 1672 note_procstat_umask, p); 1673 size += register_note(list, NT_PROCSTAT_RLIMIT, 1674 note_procstat_rlimit, p); 1675 size += register_note(list, NT_PROCSTAT_OSREL, 1676 note_procstat_osrel, p); 1677 size += register_note(list, NT_PROCSTAT_PSSTRINGS, 1678 __elfN(note_procstat_psstrings), p); 1679 size += register_note(list, NT_PROCSTAT_AUXV, 1680 __elfN(note_procstat_auxv), p); 1681 1682 *sizep = size; 1683 } 1684 1685 static void 1686 __elfN(puthdr)(struct thread *td, void *hdr, size_t hdrsize, int numsegs, 1687 size_t notesz) 1688 { 1689 Elf_Ehdr *ehdr; 1690 Elf_Phdr *phdr; 1691 struct phdr_closure phc; 1692 1693 ehdr = (Elf_Ehdr *)hdr; 1694 phdr = (Elf_Phdr *)((char *)hdr + sizeof(Elf_Ehdr)); 1695 1696 ehdr->e_ident[EI_MAG0] = ELFMAG0; 1697 ehdr->e_ident[EI_MAG1] = ELFMAG1; 1698 ehdr->e_ident[EI_MAG2] = ELFMAG2; 1699 ehdr->e_ident[EI_MAG3] = ELFMAG3; 1700 ehdr->e_ident[EI_CLASS] = ELF_CLASS; 1701 ehdr->e_ident[EI_DATA] = ELF_DATA; 1702 ehdr->e_ident[EI_VERSION] = EV_CURRENT; 1703 ehdr->e_ident[EI_OSABI] = ELFOSABI_FREEBSD; 1704 ehdr->e_ident[EI_ABIVERSION] = 0; 1705 ehdr->e_ident[EI_PAD] = 0; 1706 ehdr->e_type = ET_CORE; 1707 ehdr->e_machine = td->td_proc->p_elf_machine; 1708 ehdr->e_version = EV_CURRENT; 1709 ehdr->e_entry = 0; 1710 ehdr->e_phoff = sizeof(Elf_Ehdr); 1711 ehdr->e_flags = td->td_proc->p_elf_flags; 1712 ehdr->e_ehsize = sizeof(Elf_Ehdr); 1713 ehdr->e_phentsize = sizeof(Elf_Phdr); 1714 ehdr->e_phnum = numsegs + 1; 1715 ehdr->e_shentsize = sizeof(Elf_Shdr); 1716 ehdr->e_shnum = 0; 1717 ehdr->e_shstrndx = SHN_UNDEF; 1718 1719 /* 1720 * Fill in the program header entries. 1721 */ 1722 1723 /* The note segement. */ 1724 phdr->p_type = PT_NOTE; 1725 phdr->p_offset = hdrsize; 1726 phdr->p_vaddr = 0; 1727 phdr->p_paddr = 0; 1728 phdr->p_filesz = notesz; 1729 phdr->p_memsz = 0; 1730 phdr->p_flags = PF_R; 1731 phdr->p_align = ELF_NOTE_ROUNDSIZE; 1732 phdr++; 1733 1734 /* All the writable segments from the program. */ 1735 phc.phdr = phdr; 1736 phc.offset = round_page(hdrsize + notesz); 1737 each_writable_segment(td, cb_put_phdr, &phc); 1738 } 1739 1740 static size_t 1741 register_note(struct note_info_list *list, int type, outfunc_t out, void *arg) 1742 { 1743 struct note_info *ninfo; 1744 size_t size, notesize; 1745 1746 size = 0; 1747 out(arg, NULL, &size); 1748 ninfo = malloc(sizeof(*ninfo), M_TEMP, M_ZERO | M_WAITOK); 1749 ninfo->type = type; 1750 ninfo->outfunc = out; 1751 ninfo->outarg = arg; 1752 ninfo->outsize = size; 1753 TAILQ_INSERT_TAIL(list, ninfo, link); 1754 1755 if (type == -1) 1756 return (size); 1757 1758 notesize = sizeof(Elf_Note) + /* note header */ 1759 roundup2(sizeof(FREEBSD_ABI_VENDOR), ELF_NOTE_ROUNDSIZE) + 1760 /* note name */ 1761 roundup2(size, ELF_NOTE_ROUNDSIZE); /* note description */ 1762 1763 return (notesize); 1764 } 1765 1766 static size_t 1767 append_note_data(const void *src, void *dst, size_t len) 1768 { 1769 size_t padded_len; 1770 1771 padded_len = roundup2(len, ELF_NOTE_ROUNDSIZE); 1772 if (dst != NULL) { 1773 bcopy(src, dst, len); 1774 bzero((char *)dst + len, padded_len - len); 1775 } 1776 return (padded_len); 1777 } 1778 1779 size_t 1780 __elfN(populate_note)(int type, void *src, void *dst, size_t size, void **descp) 1781 { 1782 Elf_Note *note; 1783 char *buf; 1784 size_t notesize; 1785 1786 buf = dst; 1787 if (buf != NULL) { 1788 note = (Elf_Note *)buf; 1789 note->n_namesz = sizeof(FREEBSD_ABI_VENDOR); 1790 note->n_descsz = size; 1791 note->n_type = type; 1792 buf += sizeof(*note); 1793 buf += append_note_data(FREEBSD_ABI_VENDOR, buf, 1794 sizeof(FREEBSD_ABI_VENDOR)); 1795 append_note_data(src, buf, size); 1796 if (descp != NULL) 1797 *descp = buf; 1798 } 1799 1800 notesize = sizeof(Elf_Note) + /* note header */ 1801 roundup2(sizeof(FREEBSD_ABI_VENDOR), ELF_NOTE_ROUNDSIZE) + 1802 /* note name */ 1803 roundup2(size, ELF_NOTE_ROUNDSIZE); /* note description */ 1804 1805 return (notesize); 1806 } 1807 1808 static void 1809 __elfN(putnote)(struct note_info *ninfo, struct sbuf *sb) 1810 { 1811 Elf_Note note; 1812 ssize_t old_len, sect_len; 1813 size_t new_len, descsz, i; 1814 1815 if (ninfo->type == -1) { 1816 ninfo->outfunc(ninfo->outarg, sb, &ninfo->outsize); 1817 return; 1818 } 1819 1820 note.n_namesz = sizeof(FREEBSD_ABI_VENDOR); 1821 note.n_descsz = ninfo->outsize; 1822 note.n_type = ninfo->type; 1823 1824 sbuf_bcat(sb, ¬e, sizeof(note)); 1825 sbuf_start_section(sb, &old_len); 1826 sbuf_bcat(sb, FREEBSD_ABI_VENDOR, sizeof(FREEBSD_ABI_VENDOR)); 1827 sbuf_end_section(sb, old_len, ELF_NOTE_ROUNDSIZE, 0); 1828 if (note.n_descsz == 0) 1829 return; 1830 sbuf_start_section(sb, &old_len); 1831 ninfo->outfunc(ninfo->outarg, sb, &ninfo->outsize); 1832 sect_len = sbuf_end_section(sb, old_len, ELF_NOTE_ROUNDSIZE, 0); 1833 if (sect_len < 0) 1834 return; 1835 1836 new_len = (size_t)sect_len; 1837 descsz = roundup(note.n_descsz, ELF_NOTE_ROUNDSIZE); 1838 if (new_len < descsz) { 1839 /* 1840 * It is expected that individual note emitters will correctly 1841 * predict their expected output size and fill up to that size 1842 * themselves, padding in a format-specific way if needed. 1843 * However, in case they don't, just do it here with zeros. 1844 */ 1845 for (i = 0; i < descsz - new_len; i++) 1846 sbuf_putc(sb, 0); 1847 } else if (new_len > descsz) { 1848 /* 1849 * We can't always truncate sb -- we may have drained some 1850 * of it already. 1851 */ 1852 KASSERT(new_len == descsz, ("%s: Note type %u changed as we " 1853 "read it (%zu > %zu). Since it is longer than " 1854 "expected, this coredump's notes are corrupt. THIS " 1855 "IS A BUG in the note_procstat routine for type %u.\n", 1856 __func__, (unsigned)note.n_type, new_len, descsz, 1857 (unsigned)note.n_type)); 1858 } 1859 } 1860 1861 /* 1862 * Miscellaneous note out functions. 1863 */ 1864 1865 #if defined(COMPAT_FREEBSD32) && __ELF_WORD_SIZE == 32 1866 #include <compat/freebsd32/freebsd32.h> 1867 #include <compat/freebsd32/freebsd32_signal.h> 1868 1869 typedef struct prstatus32 elf_prstatus_t; 1870 typedef struct prpsinfo32 elf_prpsinfo_t; 1871 typedef struct fpreg32 elf_prfpregset_t; 1872 typedef struct fpreg32 elf_fpregset_t; 1873 typedef struct reg32 elf_gregset_t; 1874 typedef struct thrmisc32 elf_thrmisc_t; 1875 #define ELF_KERN_PROC_MASK KERN_PROC_MASK32 1876 typedef struct kinfo_proc32 elf_kinfo_proc_t; 1877 typedef uint32_t elf_ps_strings_t; 1878 #else 1879 typedef prstatus_t elf_prstatus_t; 1880 typedef prpsinfo_t elf_prpsinfo_t; 1881 typedef prfpregset_t elf_prfpregset_t; 1882 typedef prfpregset_t elf_fpregset_t; 1883 typedef gregset_t elf_gregset_t; 1884 typedef thrmisc_t elf_thrmisc_t; 1885 #define ELF_KERN_PROC_MASK 0 1886 typedef struct kinfo_proc elf_kinfo_proc_t; 1887 typedef vm_offset_t elf_ps_strings_t; 1888 #endif 1889 1890 static void 1891 __elfN(note_prpsinfo)(void *arg, struct sbuf *sb, size_t *sizep) 1892 { 1893 struct sbuf sbarg; 1894 size_t len; 1895 char *cp, *end; 1896 struct proc *p; 1897 elf_prpsinfo_t *psinfo; 1898 int error; 1899 1900 p = (struct proc *)arg; 1901 if (sb != NULL) { 1902 KASSERT(*sizep == sizeof(*psinfo), ("invalid size")); 1903 psinfo = malloc(sizeof(*psinfo), M_TEMP, M_ZERO | M_WAITOK); 1904 psinfo->pr_version = PRPSINFO_VERSION; 1905 psinfo->pr_psinfosz = sizeof(elf_prpsinfo_t); 1906 strlcpy(psinfo->pr_fname, p->p_comm, sizeof(psinfo->pr_fname)); 1907 PROC_LOCK(p); 1908 if (p->p_args != NULL) { 1909 len = sizeof(psinfo->pr_psargs) - 1; 1910 if (len > p->p_args->ar_length) 1911 len = p->p_args->ar_length; 1912 memcpy(psinfo->pr_psargs, p->p_args->ar_args, len); 1913 PROC_UNLOCK(p); 1914 error = 0; 1915 } else { 1916 _PHOLD(p); 1917 PROC_UNLOCK(p); 1918 sbuf_new(&sbarg, psinfo->pr_psargs, 1919 sizeof(psinfo->pr_psargs), SBUF_FIXEDLEN); 1920 error = proc_getargv(curthread, p, &sbarg); 1921 PRELE(p); 1922 if (sbuf_finish(&sbarg) == 0) 1923 len = sbuf_len(&sbarg) - 1; 1924 else 1925 len = sizeof(psinfo->pr_psargs) - 1; 1926 sbuf_delete(&sbarg); 1927 } 1928 if (error || len == 0) 1929 strlcpy(psinfo->pr_psargs, p->p_comm, 1930 sizeof(psinfo->pr_psargs)); 1931 else { 1932 KASSERT(len < sizeof(psinfo->pr_psargs), 1933 ("len is too long: %zu vs %zu", len, 1934 sizeof(psinfo->pr_psargs))); 1935 cp = psinfo->pr_psargs; 1936 end = cp + len - 1; 1937 for (;;) { 1938 cp = memchr(cp, '\0', end - cp); 1939 if (cp == NULL) 1940 break; 1941 *cp = ' '; 1942 } 1943 } 1944 psinfo->pr_pid = p->p_pid; 1945 sbuf_bcat(sb, psinfo, sizeof(*psinfo)); 1946 free(psinfo, M_TEMP); 1947 } 1948 *sizep = sizeof(*psinfo); 1949 } 1950 1951 static void 1952 __elfN(note_prstatus)(void *arg, struct sbuf *sb, size_t *sizep) 1953 { 1954 struct thread *td; 1955 elf_prstatus_t *status; 1956 1957 td = (struct thread *)arg; 1958 if (sb != NULL) { 1959 KASSERT(*sizep == sizeof(*status), ("invalid size")); 1960 status = malloc(sizeof(*status), M_TEMP, M_ZERO | M_WAITOK); 1961 status->pr_version = PRSTATUS_VERSION; 1962 status->pr_statussz = sizeof(elf_prstatus_t); 1963 status->pr_gregsetsz = sizeof(elf_gregset_t); 1964 status->pr_fpregsetsz = sizeof(elf_fpregset_t); 1965 status->pr_osreldate = osreldate; 1966 status->pr_cursig = td->td_proc->p_sig; 1967 status->pr_pid = td->td_tid; 1968 #if defined(COMPAT_FREEBSD32) && __ELF_WORD_SIZE == 32 1969 fill_regs32(td, &status->pr_reg); 1970 #else 1971 fill_regs(td, &status->pr_reg); 1972 #endif 1973 sbuf_bcat(sb, status, sizeof(*status)); 1974 free(status, M_TEMP); 1975 } 1976 *sizep = sizeof(*status); 1977 } 1978 1979 static void 1980 __elfN(note_fpregset)(void *arg, struct sbuf *sb, size_t *sizep) 1981 { 1982 struct thread *td; 1983 elf_prfpregset_t *fpregset; 1984 1985 td = (struct thread *)arg; 1986 if (sb != NULL) { 1987 KASSERT(*sizep == sizeof(*fpregset), ("invalid size")); 1988 fpregset = malloc(sizeof(*fpregset), M_TEMP, M_ZERO | M_WAITOK); 1989 #if defined(COMPAT_FREEBSD32) && __ELF_WORD_SIZE == 32 1990 fill_fpregs32(td, fpregset); 1991 #else 1992 fill_fpregs(td, fpregset); 1993 #endif 1994 sbuf_bcat(sb, fpregset, sizeof(*fpregset)); 1995 free(fpregset, M_TEMP); 1996 } 1997 *sizep = sizeof(*fpregset); 1998 } 1999 2000 static void 2001 __elfN(note_thrmisc)(void *arg, struct sbuf *sb, size_t *sizep) 2002 { 2003 struct thread *td; 2004 elf_thrmisc_t thrmisc; 2005 2006 td = (struct thread *)arg; 2007 if (sb != NULL) { 2008 KASSERT(*sizep == sizeof(thrmisc), ("invalid size")); 2009 bzero(&thrmisc._pad, sizeof(thrmisc._pad)); 2010 strcpy(thrmisc.pr_tname, td->td_name); 2011 sbuf_bcat(sb, &thrmisc, sizeof(thrmisc)); 2012 } 2013 *sizep = sizeof(thrmisc); 2014 } 2015 2016 static void 2017 __elfN(note_ptlwpinfo)(void *arg, struct sbuf *sb, size_t *sizep) 2018 { 2019 struct thread *td; 2020 size_t size; 2021 int structsize; 2022 #if defined(COMPAT_FREEBSD32) && __ELF_WORD_SIZE == 32 2023 struct ptrace_lwpinfo32 pl; 2024 #else 2025 struct ptrace_lwpinfo pl; 2026 #endif 2027 2028 td = (struct thread *)arg; 2029 size = sizeof(structsize) + sizeof(pl); 2030 if (sb != NULL) { 2031 KASSERT(*sizep == size, ("invalid size")); 2032 structsize = sizeof(pl); 2033 sbuf_bcat(sb, &structsize, sizeof(structsize)); 2034 bzero(&pl, sizeof(pl)); 2035 pl.pl_lwpid = td->td_tid; 2036 pl.pl_event = PL_EVENT_NONE; 2037 pl.pl_sigmask = td->td_sigmask; 2038 pl.pl_siglist = td->td_siglist; 2039 if (td->td_si.si_signo != 0) { 2040 pl.pl_event = PL_EVENT_SIGNAL; 2041 pl.pl_flags |= PL_FLAG_SI; 2042 #if defined(COMPAT_FREEBSD32) && __ELF_WORD_SIZE == 32 2043 siginfo_to_siginfo32(&td->td_si, &pl.pl_siginfo); 2044 #else 2045 pl.pl_siginfo = td->td_si; 2046 #endif 2047 } 2048 strcpy(pl.pl_tdname, td->td_name); 2049 /* XXX TODO: supply more information in struct ptrace_lwpinfo*/ 2050 sbuf_bcat(sb, &pl, sizeof(pl)); 2051 } 2052 *sizep = size; 2053 } 2054 2055 /* 2056 * Allow for MD specific notes, as well as any MD 2057 * specific preparations for writing MI notes. 2058 */ 2059 static void 2060 __elfN(note_threadmd)(void *arg, struct sbuf *sb, size_t *sizep) 2061 { 2062 struct thread *td; 2063 void *buf; 2064 size_t size; 2065 2066 td = (struct thread *)arg; 2067 size = *sizep; 2068 if (size != 0 && sb != NULL) 2069 buf = malloc(size, M_TEMP, M_ZERO | M_WAITOK); 2070 else 2071 buf = NULL; 2072 size = 0; 2073 __elfN(dump_thread)(td, buf, &size); 2074 KASSERT(sb == NULL || *sizep == size, ("invalid size")); 2075 if (size != 0 && sb != NULL) 2076 sbuf_bcat(sb, buf, size); 2077 free(buf, M_TEMP); 2078 *sizep = size; 2079 } 2080 2081 #ifdef KINFO_PROC_SIZE 2082 CTASSERT(sizeof(struct kinfo_proc) == KINFO_PROC_SIZE); 2083 #endif 2084 2085 static void 2086 __elfN(note_procstat_proc)(void *arg, struct sbuf *sb, size_t *sizep) 2087 { 2088 struct proc *p; 2089 size_t size; 2090 int structsize; 2091 2092 p = (struct proc *)arg; 2093 size = sizeof(structsize) + p->p_numthreads * 2094 sizeof(elf_kinfo_proc_t); 2095 2096 if (sb != NULL) { 2097 KASSERT(*sizep == size, ("invalid size")); 2098 structsize = sizeof(elf_kinfo_proc_t); 2099 sbuf_bcat(sb, &structsize, sizeof(structsize)); 2100 sx_slock(&proctree_lock); 2101 PROC_LOCK(p); 2102 kern_proc_out(p, sb, ELF_KERN_PROC_MASK); 2103 sx_sunlock(&proctree_lock); 2104 } 2105 *sizep = size; 2106 } 2107 2108 #ifdef KINFO_FILE_SIZE 2109 CTASSERT(sizeof(struct kinfo_file) == KINFO_FILE_SIZE); 2110 #endif 2111 2112 static void 2113 note_procstat_files(void *arg, struct sbuf *sb, size_t *sizep) 2114 { 2115 struct proc *p; 2116 size_t size, sect_sz, i; 2117 ssize_t start_len, sect_len; 2118 int structsize, filedesc_flags; 2119 2120 if (coredump_pack_fileinfo) 2121 filedesc_flags = KERN_FILEDESC_PACK_KINFO; 2122 else 2123 filedesc_flags = 0; 2124 2125 p = (struct proc *)arg; 2126 structsize = sizeof(struct kinfo_file); 2127 if (sb == NULL) { 2128 size = 0; 2129 sb = sbuf_new(NULL, NULL, 128, SBUF_FIXEDLEN); 2130 sbuf_set_drain(sb, sbuf_drain_count, &size); 2131 sbuf_bcat(sb, &structsize, sizeof(structsize)); 2132 PROC_LOCK(p); 2133 kern_proc_filedesc_out(p, sb, -1, filedesc_flags); 2134 sbuf_finish(sb); 2135 sbuf_delete(sb); 2136 *sizep = size; 2137 } else { 2138 sbuf_start_section(sb, &start_len); 2139 2140 sbuf_bcat(sb, &structsize, sizeof(structsize)); 2141 PROC_LOCK(p); 2142 kern_proc_filedesc_out(p, sb, *sizep - sizeof(structsize), 2143 filedesc_flags); 2144 2145 sect_len = sbuf_end_section(sb, start_len, 0, 0); 2146 if (sect_len < 0) 2147 return; 2148 sect_sz = sect_len; 2149 2150 KASSERT(sect_sz <= *sizep, 2151 ("kern_proc_filedesc_out did not respect maxlen; " 2152 "requested %zu, got %zu", *sizep - sizeof(structsize), 2153 sect_sz - sizeof(structsize))); 2154 2155 for (i = 0; i < *sizep - sect_sz && sb->s_error == 0; i++) 2156 sbuf_putc(sb, 0); 2157 } 2158 } 2159 2160 #ifdef KINFO_VMENTRY_SIZE 2161 CTASSERT(sizeof(struct kinfo_vmentry) == KINFO_VMENTRY_SIZE); 2162 #endif 2163 2164 static void 2165 note_procstat_vmmap(void *arg, struct sbuf *sb, size_t *sizep) 2166 { 2167 struct proc *p; 2168 size_t size; 2169 int structsize, vmmap_flags; 2170 2171 if (coredump_pack_vmmapinfo) 2172 vmmap_flags = KERN_VMMAP_PACK_KINFO; 2173 else 2174 vmmap_flags = 0; 2175 2176 p = (struct proc *)arg; 2177 structsize = sizeof(struct kinfo_vmentry); 2178 if (sb == NULL) { 2179 size = 0; 2180 sb = sbuf_new(NULL, NULL, 128, SBUF_FIXEDLEN); 2181 sbuf_set_drain(sb, sbuf_drain_count, &size); 2182 sbuf_bcat(sb, &structsize, sizeof(structsize)); 2183 PROC_LOCK(p); 2184 kern_proc_vmmap_out(p, sb, -1, vmmap_flags); 2185 sbuf_finish(sb); 2186 sbuf_delete(sb); 2187 *sizep = size; 2188 } else { 2189 sbuf_bcat(sb, &structsize, sizeof(structsize)); 2190 PROC_LOCK(p); 2191 kern_proc_vmmap_out(p, sb, *sizep - sizeof(structsize), 2192 vmmap_flags); 2193 } 2194 } 2195 2196 static void 2197 note_procstat_groups(void *arg, struct sbuf *sb, size_t *sizep) 2198 { 2199 struct proc *p; 2200 size_t size; 2201 int structsize; 2202 2203 p = (struct proc *)arg; 2204 size = sizeof(structsize) + p->p_ucred->cr_ngroups * sizeof(gid_t); 2205 if (sb != NULL) { 2206 KASSERT(*sizep == size, ("invalid size")); 2207 structsize = sizeof(gid_t); 2208 sbuf_bcat(sb, &structsize, sizeof(structsize)); 2209 sbuf_bcat(sb, p->p_ucred->cr_groups, p->p_ucred->cr_ngroups * 2210 sizeof(gid_t)); 2211 } 2212 *sizep = size; 2213 } 2214 2215 static void 2216 note_procstat_umask(void *arg, struct sbuf *sb, size_t *sizep) 2217 { 2218 struct proc *p; 2219 size_t size; 2220 int structsize; 2221 2222 p = (struct proc *)arg; 2223 size = sizeof(structsize) + sizeof(p->p_fd->fd_cmask); 2224 if (sb != NULL) { 2225 KASSERT(*sizep == size, ("invalid size")); 2226 structsize = sizeof(p->p_fd->fd_cmask); 2227 sbuf_bcat(sb, &structsize, sizeof(structsize)); 2228 sbuf_bcat(sb, &p->p_fd->fd_cmask, sizeof(p->p_fd->fd_cmask)); 2229 } 2230 *sizep = size; 2231 } 2232 2233 static void 2234 note_procstat_rlimit(void *arg, struct sbuf *sb, size_t *sizep) 2235 { 2236 struct proc *p; 2237 struct rlimit rlim[RLIM_NLIMITS]; 2238 size_t size; 2239 int structsize, i; 2240 2241 p = (struct proc *)arg; 2242 size = sizeof(structsize) + sizeof(rlim); 2243 if (sb != NULL) { 2244 KASSERT(*sizep == size, ("invalid size")); 2245 structsize = sizeof(rlim); 2246 sbuf_bcat(sb, &structsize, sizeof(structsize)); 2247 PROC_LOCK(p); 2248 for (i = 0; i < RLIM_NLIMITS; i++) 2249 lim_rlimit_proc(p, i, &rlim[i]); 2250 PROC_UNLOCK(p); 2251 sbuf_bcat(sb, rlim, sizeof(rlim)); 2252 } 2253 *sizep = size; 2254 } 2255 2256 static void 2257 note_procstat_osrel(void *arg, struct sbuf *sb, size_t *sizep) 2258 { 2259 struct proc *p; 2260 size_t size; 2261 int structsize; 2262 2263 p = (struct proc *)arg; 2264 size = sizeof(structsize) + sizeof(p->p_osrel); 2265 if (sb != NULL) { 2266 KASSERT(*sizep == size, ("invalid size")); 2267 structsize = sizeof(p->p_osrel); 2268 sbuf_bcat(sb, &structsize, sizeof(structsize)); 2269 sbuf_bcat(sb, &p->p_osrel, sizeof(p->p_osrel)); 2270 } 2271 *sizep = size; 2272 } 2273 2274 static void 2275 __elfN(note_procstat_psstrings)(void *arg, struct sbuf *sb, size_t *sizep) 2276 { 2277 struct proc *p; 2278 elf_ps_strings_t ps_strings; 2279 size_t size; 2280 int structsize; 2281 2282 p = (struct proc *)arg; 2283 size = sizeof(structsize) + sizeof(ps_strings); 2284 if (sb != NULL) { 2285 KASSERT(*sizep == size, ("invalid size")); 2286 structsize = sizeof(ps_strings); 2287 #if defined(COMPAT_FREEBSD32) && __ELF_WORD_SIZE == 32 2288 ps_strings = PTROUT(p->p_sysent->sv_psstrings); 2289 #else 2290 ps_strings = p->p_sysent->sv_psstrings; 2291 #endif 2292 sbuf_bcat(sb, &structsize, sizeof(structsize)); 2293 sbuf_bcat(sb, &ps_strings, sizeof(ps_strings)); 2294 } 2295 *sizep = size; 2296 } 2297 2298 static void 2299 __elfN(note_procstat_auxv)(void *arg, struct sbuf *sb, size_t *sizep) 2300 { 2301 struct proc *p; 2302 size_t size; 2303 int structsize; 2304 2305 p = (struct proc *)arg; 2306 if (sb == NULL) { 2307 size = 0; 2308 sb = sbuf_new(NULL, NULL, 128, SBUF_FIXEDLEN); 2309 sbuf_set_drain(sb, sbuf_drain_count, &size); 2310 sbuf_bcat(sb, &structsize, sizeof(structsize)); 2311 PHOLD(p); 2312 proc_getauxv(curthread, p, sb); 2313 PRELE(p); 2314 sbuf_finish(sb); 2315 sbuf_delete(sb); 2316 *sizep = size; 2317 } else { 2318 structsize = sizeof(Elf_Auxinfo); 2319 sbuf_bcat(sb, &structsize, sizeof(structsize)); 2320 PHOLD(p); 2321 proc_getauxv(curthread, p, sb); 2322 PRELE(p); 2323 } 2324 } 2325 2326 static boolean_t 2327 __elfN(parse_notes)(struct image_params *imgp, Elf_Brandnote *checknote, 2328 int32_t *osrel, const Elf_Phdr *pnote) 2329 { 2330 const Elf_Note *note, *note0, *note_end; 2331 const char *note_name; 2332 char *buf; 2333 int i, error; 2334 boolean_t res; 2335 2336 /* We need some limit, might as well use PAGE_SIZE. */ 2337 if (pnote == NULL || pnote->p_filesz > PAGE_SIZE) 2338 return (FALSE); 2339 ASSERT_VOP_LOCKED(imgp->vp, "parse_notes"); 2340 if (pnote->p_offset > PAGE_SIZE || 2341 pnote->p_filesz > PAGE_SIZE - pnote->p_offset) { 2342 VOP_UNLOCK(imgp->vp, 0); 2343 buf = malloc(pnote->p_filesz, M_TEMP, M_WAITOK); 2344 vn_lock(imgp->vp, LK_EXCLUSIVE | LK_RETRY); 2345 error = vn_rdwr(UIO_READ, imgp->vp, buf, pnote->p_filesz, 2346 pnote->p_offset, UIO_SYSSPACE, IO_NODELOCKED, 2347 curthread->td_ucred, NOCRED, NULL, curthread); 2348 if (error != 0) { 2349 uprintf("i/o error PT_NOTE\n"); 2350 res = FALSE; 2351 goto ret; 2352 } 2353 note = note0 = (const Elf_Note *)buf; 2354 note_end = (const Elf_Note *)(buf + pnote->p_filesz); 2355 } else { 2356 note = note0 = (const Elf_Note *)(imgp->image_header + 2357 pnote->p_offset); 2358 note_end = (const Elf_Note *)(imgp->image_header + 2359 pnote->p_offset + pnote->p_filesz); 2360 buf = NULL; 2361 } 2362 for (i = 0; i < 100 && note >= note0 && note < note_end; i++) { 2363 if (!aligned(note, Elf32_Addr) || (const char *)note_end - 2364 (const char *)note < sizeof(Elf_Note)) { 2365 res = FALSE; 2366 goto ret; 2367 } 2368 if (note->n_namesz != checknote->hdr.n_namesz || 2369 note->n_descsz != checknote->hdr.n_descsz || 2370 note->n_type != checknote->hdr.n_type) 2371 goto nextnote; 2372 note_name = (const char *)(note + 1); 2373 if (note_name + checknote->hdr.n_namesz >= 2374 (const char *)note_end || strncmp(checknote->vendor, 2375 note_name, checknote->hdr.n_namesz) != 0) 2376 goto nextnote; 2377 2378 /* 2379 * Fetch the osreldate for binary 2380 * from the ELF OSABI-note if necessary. 2381 */ 2382 if ((checknote->flags & BN_TRANSLATE_OSREL) != 0 && 2383 checknote->trans_osrel != NULL) { 2384 res = checknote->trans_osrel(note, osrel); 2385 goto ret; 2386 } 2387 res = TRUE; 2388 goto ret; 2389 nextnote: 2390 note = (const Elf_Note *)((const char *)(note + 1) + 2391 roundup2(note->n_namesz, ELF_NOTE_ROUNDSIZE) + 2392 roundup2(note->n_descsz, ELF_NOTE_ROUNDSIZE)); 2393 } 2394 res = FALSE; 2395 ret: 2396 free(buf, M_TEMP); 2397 return (res); 2398 } 2399 2400 /* 2401 * Try to find the appropriate ABI-note section for checknote, 2402 * fetch the osreldate for binary from the ELF OSABI-note. Only the 2403 * first page of the image is searched, the same as for headers. 2404 */ 2405 static boolean_t 2406 __elfN(check_note)(struct image_params *imgp, Elf_Brandnote *checknote, 2407 int32_t *osrel) 2408 { 2409 const Elf_Phdr *phdr; 2410 const Elf_Ehdr *hdr; 2411 int i; 2412 2413 hdr = (const Elf_Ehdr *)imgp->image_header; 2414 phdr = (const Elf_Phdr *)(imgp->image_header + hdr->e_phoff); 2415 2416 for (i = 0; i < hdr->e_phnum; i++) { 2417 if (phdr[i].p_type == PT_NOTE && 2418 __elfN(parse_notes)(imgp, checknote, osrel, &phdr[i])) 2419 return (TRUE); 2420 } 2421 return (FALSE); 2422 2423 } 2424 2425 /* 2426 * Tell kern_execve.c about it, with a little help from the linker. 2427 */ 2428 static struct execsw __elfN(execsw) = { 2429 __CONCAT(exec_, __elfN(imgact)), 2430 __XSTRING(__CONCAT(ELF, __ELF_WORD_SIZE)) 2431 }; 2432 EXEC_SET(__CONCAT(elf, __ELF_WORD_SIZE), __elfN(execsw)); 2433 2434 static vm_prot_t 2435 __elfN(trans_prot)(Elf_Word flags) 2436 { 2437 vm_prot_t prot; 2438 2439 prot = 0; 2440 if (flags & PF_X) 2441 prot |= VM_PROT_EXECUTE; 2442 if (flags & PF_W) 2443 prot |= VM_PROT_WRITE; 2444 if (flags & PF_R) 2445 prot |= VM_PROT_READ; 2446 #if __ELF_WORD_SIZE == 32 2447 #if defined(__amd64__) 2448 if (i386_read_exec && (flags & PF_R)) 2449 prot |= VM_PROT_EXECUTE; 2450 #endif 2451 #endif 2452 return (prot); 2453 } 2454 2455 static Elf_Word 2456 __elfN(untrans_prot)(vm_prot_t prot) 2457 { 2458 Elf_Word flags; 2459 2460 flags = 0; 2461 if (prot & VM_PROT_EXECUTE) 2462 flags |= PF_X; 2463 if (prot & VM_PROT_READ) 2464 flags |= PF_R; 2465 if (prot & VM_PROT_WRITE) 2466 flags |= PF_W; 2467 return (flags); 2468 }
Cache object: 33c09ebe29b1de1595644e1eddb21bf0
[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]