Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/kern/imgact_elf.c
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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: releng/12.0/sys/kern/imgact_elf.c 338603 2018-09-12 04:57:34Z gordon $"); 36 37 #include "opt_capsicum.h" 38 39 #include <sys/param.h> 40 #include <sys/capsicum.h> 41 #include <sys/compressor.h> 42 #include <sys/exec.h> 43 #include <sys/fcntl.h> 44 #include <sys/imgact.h> 45 #include <sys/imgact_elf.h> 46 #include <sys/jail.h> 47 #include <sys/kernel.h> 48 #include <sys/lock.h> 49 #include <sys/malloc.h> 50 #include <sys/mount.h> 51 #include <sys/mman.h> 52 #include <sys/namei.h> 53 #include <sys/pioctl.h> 54 #include <sys/proc.h> 55 #include <sys/procfs.h> 56 #include <sys/ptrace.h> 57 #include <sys/racct.h> 58 #include <sys/resourcevar.h> 59 #include <sys/rwlock.h> 60 #include <sys/sbuf.h> 61 #include <sys/sf_buf.h> 62 #include <sys/smp.h> 63 #include <sys/systm.h> 64 #include <sys/signalvar.h> 65 #include <sys/stat.h> 66 #include <sys/sx.h> 67 #include <sys/syscall.h> 68 #include <sys/sysctl.h> 69 #include <sys/sysent.h> 70 #include <sys/vnode.h> 71 #include <sys/syslog.h> 72 #include <sys/eventhandler.h> 73 #include <sys/user.h> 74 75 #include <vm/vm.h> 76 #include <vm/vm_kern.h> 77 #include <vm/vm_param.h> 78 #include <vm/pmap.h> 79 #include <vm/vm_map.h> 80 #include <vm/vm_object.h> 81 #include <vm/vm_extern.h> 82 83 #include <machine/elf.h> 84 #include <machine/md_var.h> 85 86 #define ELF_NOTE_ROUNDSIZE 4 87 #define OLD_EI_BRAND 8 88 89 static int __elfN(check_header)(const Elf_Ehdr *hdr); 90 static Elf_Brandinfo *__elfN(get_brandinfo)(struct image_params *imgp, 91 const char *interp, int interp_name_len, int32_t *osrel); 92 static int __elfN(load_file)(struct proc *p, const char *file, u_long *addr, 93 u_long *entry, size_t pagesize); 94 static int __elfN(load_section)(struct image_params *imgp, vm_ooffset_t offset, 95 caddr_t vmaddr, size_t memsz, size_t filsz, vm_prot_t prot, 96 size_t pagesize); 97 static int __CONCAT(exec_, __elfN(imgact))(struct image_params *imgp); 98 static bool __elfN(freebsd_trans_osrel)(const Elf_Note *note, 99 int32_t *osrel); 100 static bool kfreebsd_trans_osrel(const Elf_Note *note, int32_t *osrel); 101 static boolean_t __elfN(check_note)(struct image_params *imgp, 102 Elf_Brandnote *checknote, int32_t *osrel); 103 static vm_prot_t __elfN(trans_prot)(Elf_Word); 104 static Elf_Word __elfN(untrans_prot)(vm_prot_t); 105 106 SYSCTL_NODE(_kern, OID_AUTO, __CONCAT(elf, __ELF_WORD_SIZE), CTLFLAG_RW, 0, 107 ""); 108 109 #define CORE_BUF_SIZE (16 * 1024) 110 111 int __elfN(fallback_brand) = -1; 112 SYSCTL_INT(__CONCAT(_kern_elf, __ELF_WORD_SIZE), OID_AUTO, 113 fallback_brand, CTLFLAG_RWTUN, &__elfN(fallback_brand), 0, 114 __XSTRING(__CONCAT(ELF, __ELF_WORD_SIZE)) " brand of last resort"); 115 116 static int elf_legacy_coredump = 0; 117 SYSCTL_INT(_debug, OID_AUTO, __elfN(legacy_coredump), CTLFLAG_RW, 118 &elf_legacy_coredump, 0, 119 "include all and only RW pages in core dumps"); 120 121 int __elfN(nxstack) = 122 #if defined(__amd64__) || defined(__powerpc64__) /* both 64 and 32 bit */ || \ 123 (defined(__arm__) && __ARM_ARCH >= 7) || defined(__aarch64__) 124 1; 125 #else 126 0; 127 #endif 128 SYSCTL_INT(__CONCAT(_kern_elf, __ELF_WORD_SIZE), OID_AUTO, 129 nxstack, CTLFLAG_RW, &__elfN(nxstack), 0, 130 __XSTRING(__CONCAT(ELF, __ELF_WORD_SIZE)) ": enable non-executable stack"); 131 132 #if __ELF_WORD_SIZE == 32 133 #if defined(__amd64__) 134 int i386_read_exec = 0; 135 SYSCTL_INT(_kern_elf32, OID_AUTO, read_exec, CTLFLAG_RW, &i386_read_exec, 0, 136 "enable execution from readable segments"); 137 #endif 138 #endif 139 140 static Elf_Brandinfo *elf_brand_list[MAX_BRANDS]; 141 142 #define trunc_page_ps(va, ps) rounddown2(va, ps) 143 #define round_page_ps(va, ps) roundup2(va, ps) 144 #define aligned(a, t) (trunc_page_ps((u_long)(a), sizeof(t)) == (u_long)(a)) 145 146 static const char FREEBSD_ABI_VENDOR[] = "FreeBSD"; 147 148 Elf_Brandnote __elfN(freebsd_brandnote) = { 149 .hdr.n_namesz = sizeof(FREEBSD_ABI_VENDOR), 150 .hdr.n_descsz = sizeof(int32_t), 151 .hdr.n_type = NT_FREEBSD_ABI_TAG, 152 .vendor = FREEBSD_ABI_VENDOR, 153 .flags = BN_TRANSLATE_OSREL, 154 .trans_osrel = __elfN(freebsd_trans_osrel) 155 }; 156 157 static bool 158 __elfN(freebsd_trans_osrel)(const Elf_Note *note, int32_t *osrel) 159 { 160 uintptr_t p; 161 162 p = (uintptr_t)(note + 1); 163 p += roundup2(note->n_namesz, ELF_NOTE_ROUNDSIZE); 164 *osrel = *(const int32_t *)(p); 165 166 return (true); 167 } 168 169 static const char GNU_ABI_VENDOR[] = "GNU"; 170 static int GNU_KFREEBSD_ABI_DESC = 3; 171 172 Elf_Brandnote __elfN(kfreebsd_brandnote) = { 173 .hdr.n_namesz = sizeof(GNU_ABI_VENDOR), 174 .hdr.n_descsz = 16, /* XXX at least 16 */ 175 .hdr.n_type = 1, 176 .vendor = GNU_ABI_VENDOR, 177 .flags = BN_TRANSLATE_OSREL, 178 .trans_osrel = kfreebsd_trans_osrel 179 }; 180 181 static bool 182 kfreebsd_trans_osrel(const Elf_Note *note, int32_t *osrel) 183 { 184 const Elf32_Word *desc; 185 uintptr_t p; 186 187 p = (uintptr_t)(note + 1); 188 p += roundup2(note->n_namesz, ELF_NOTE_ROUNDSIZE); 189 190 desc = (const Elf32_Word *)p; 191 if (desc[0] != GNU_KFREEBSD_ABI_DESC) 192 return (false); 193 194 /* 195 * Debian GNU/kFreeBSD embed the earliest compatible kernel version 196 * (__FreeBSD_version: <major><two digit minor>Rxx) in the LSB way. 197 */ 198 *osrel = desc[1] * 100000 + desc[2] * 1000 + desc[3]; 199 200 return (true); 201 } 202 203 int 204 __elfN(insert_brand_entry)(Elf_Brandinfo *entry) 205 { 206 int i; 207 208 for (i = 0; i < MAX_BRANDS; i++) { 209 if (elf_brand_list[i] == NULL) { 210 elf_brand_list[i] = entry; 211 break; 212 } 213 } 214 if (i == MAX_BRANDS) { 215 printf("WARNING: %s: could not insert brandinfo entry: %p\n", 216 __func__, entry); 217 return (-1); 218 } 219 return (0); 220 } 221 222 int 223 __elfN(remove_brand_entry)(Elf_Brandinfo *entry) 224 { 225 int i; 226 227 for (i = 0; i < MAX_BRANDS; i++) { 228 if (elf_brand_list[i] == entry) { 229 elf_brand_list[i] = NULL; 230 break; 231 } 232 } 233 if (i == MAX_BRANDS) 234 return (-1); 235 return (0); 236 } 237 238 int 239 __elfN(brand_inuse)(Elf_Brandinfo *entry) 240 { 241 struct proc *p; 242 int rval = FALSE; 243 244 sx_slock(&allproc_lock); 245 FOREACH_PROC_IN_SYSTEM(p) { 246 if (p->p_sysent == entry->sysvec) { 247 rval = TRUE; 248 break; 249 } 250 } 251 sx_sunlock(&allproc_lock); 252 253 return (rval); 254 } 255 256 static Elf_Brandinfo * 257 __elfN(get_brandinfo)(struct image_params *imgp, const char *interp, 258 int interp_name_len, int32_t *osrel) 259 { 260 const Elf_Ehdr *hdr = (const Elf_Ehdr *)imgp->image_header; 261 Elf_Brandinfo *bi, *bi_m; 262 boolean_t ret; 263 int i; 264 265 /* 266 * We support four types of branding -- (1) the ELF EI_OSABI field 267 * that SCO added to the ELF spec, (2) FreeBSD 3.x's traditional string 268 * branding w/in the ELF header, (3) path of the `interp_path' 269 * field, and (4) the ".note.ABI-tag" ELF section. 270 */ 271 272 /* Look for an ".note.ABI-tag" ELF section */ 273 bi_m = NULL; 274 for (i = 0; i < MAX_BRANDS; i++) { 275 bi = elf_brand_list[i]; 276 if (bi == NULL) 277 continue; 278 if (interp != NULL && (bi->flags & BI_BRAND_ONLY_STATIC) != 0) 279 continue; 280 if (hdr->e_machine == bi->machine && (bi->flags & 281 (BI_BRAND_NOTE|BI_BRAND_NOTE_MANDATORY)) != 0) { 282 ret = __elfN(check_note)(imgp, bi->brand_note, osrel); 283 /* Give brand a chance to veto check_note's guess */ 284 if (ret && bi->header_supported) 285 ret = bi->header_supported(imgp); 286 /* 287 * If note checker claimed the binary, but the 288 * interpreter path in the image does not 289 * match default one for the brand, try to 290 * search for other brands with the same 291 * interpreter. Either there is better brand 292 * with the right interpreter, or, failing 293 * this, we return first brand which accepted 294 * our note and, optionally, header. 295 */ 296 if (ret && bi_m == NULL && interp != NULL && 297 (bi->interp_path == NULL || 298 (strlen(bi->interp_path) + 1 != interp_name_len || 299 strncmp(interp, bi->interp_path, interp_name_len) 300 != 0))) { 301 bi_m = bi; 302 ret = 0; 303 } 304 if (ret) 305 return (bi); 306 } 307 } 308 if (bi_m != NULL) 309 return (bi_m); 310 311 /* If the executable has a brand, search for it in the brand list. */ 312 for (i = 0; i < MAX_BRANDS; i++) { 313 bi = elf_brand_list[i]; 314 if (bi == NULL || (bi->flags & BI_BRAND_NOTE_MANDATORY) != 0 || 315 (interp != NULL && (bi->flags & BI_BRAND_ONLY_STATIC) != 0)) 316 continue; 317 if (hdr->e_machine == bi->machine && 318 (hdr->e_ident[EI_OSABI] == bi->brand || 319 (bi->compat_3_brand != NULL && 320 strcmp((const char *)&hdr->e_ident[OLD_EI_BRAND], 321 bi->compat_3_brand) == 0))) { 322 /* Looks good, but give brand a chance to veto */ 323 if (bi->header_supported == NULL || 324 bi->header_supported(imgp)) { 325 /* 326 * Again, prefer strictly matching 327 * interpreter path. 328 */ 329 if (interp_name_len == 0 && 330 bi->interp_path == NULL) 331 return (bi); 332 if (bi->interp_path != NULL && 333 strlen(bi->interp_path) + 1 == 334 interp_name_len && strncmp(interp, 335 bi->interp_path, interp_name_len) == 0) 336 return (bi); 337 if (bi_m == NULL) 338 bi_m = bi; 339 } 340 } 341 } 342 if (bi_m != NULL) 343 return (bi_m); 344 345 /* No known brand, see if the header is recognized by any brand */ 346 for (i = 0; i < MAX_BRANDS; i++) { 347 bi = elf_brand_list[i]; 348 if (bi == NULL || bi->flags & BI_BRAND_NOTE_MANDATORY || 349 bi->header_supported == NULL) 350 continue; 351 if (hdr->e_machine == bi->machine) { 352 ret = bi->header_supported(imgp); 353 if (ret) 354 return (bi); 355 } 356 } 357 358 /* Lacking a known brand, search for a recognized interpreter. */ 359 if (interp != NULL) { 360 for (i = 0; i < MAX_BRANDS; i++) { 361 bi = elf_brand_list[i]; 362 if (bi == NULL || (bi->flags & 363 (BI_BRAND_NOTE_MANDATORY | BI_BRAND_ONLY_STATIC)) 364 != 0) 365 continue; 366 if (hdr->e_machine == bi->machine && 367 bi->interp_path != NULL && 368 /* ELF image p_filesz includes terminating zero */ 369 strlen(bi->interp_path) + 1 == interp_name_len && 370 strncmp(interp, bi->interp_path, interp_name_len) 371 == 0 && (bi->header_supported == NULL || 372 bi->header_supported(imgp))) 373 return (bi); 374 } 375 } 376 377 /* Lacking a recognized interpreter, try the default brand */ 378 for (i = 0; i < MAX_BRANDS; i++) { 379 bi = elf_brand_list[i]; 380 if (bi == NULL || (bi->flags & BI_BRAND_NOTE_MANDATORY) != 0 || 381 (interp != NULL && (bi->flags & BI_BRAND_ONLY_STATIC) != 0)) 382 continue; 383 if (hdr->e_machine == bi->machine && 384 __elfN(fallback_brand) == bi->brand && 385 (bi->header_supported == NULL || 386 bi->header_supported(imgp))) 387 return (bi); 388 } 389 return (NULL); 390 } 391 392 static int 393 __elfN(check_header)(const Elf_Ehdr *hdr) 394 { 395 Elf_Brandinfo *bi; 396 int i; 397 398 if (!IS_ELF(*hdr) || 399 hdr->e_ident[EI_CLASS] != ELF_TARG_CLASS || 400 hdr->e_ident[EI_DATA] != ELF_TARG_DATA || 401 hdr->e_ident[EI_VERSION] != EV_CURRENT || 402 hdr->e_phentsize != sizeof(Elf_Phdr) || 403 hdr->e_version != ELF_TARG_VER) 404 return (ENOEXEC); 405 406 /* 407 * Make sure we have at least one brand for this machine. 408 */ 409 410 for (i = 0; i < MAX_BRANDS; i++) { 411 bi = elf_brand_list[i]; 412 if (bi != NULL && bi->machine == hdr->e_machine) 413 break; 414 } 415 if (i == MAX_BRANDS) 416 return (ENOEXEC); 417 418 return (0); 419 } 420 421 static int 422 __elfN(map_partial)(vm_map_t map, vm_object_t object, vm_ooffset_t offset, 423 vm_offset_t start, vm_offset_t end, vm_prot_t prot) 424 { 425 struct sf_buf *sf; 426 int error; 427 vm_offset_t off; 428 429 /* 430 * Create the page if it doesn't exist yet. Ignore errors. 431 */ 432 vm_map_fixed(map, NULL, 0, trunc_page(start), round_page(end) - 433 trunc_page(start), VM_PROT_ALL, VM_PROT_ALL, MAP_CHECK_EXCL); 434 435 /* 436 * Find the page from the underlying object. 437 */ 438 if (object != NULL) { 439 sf = vm_imgact_map_page(object, offset); 440 if (sf == NULL) 441 return (KERN_FAILURE); 442 off = offset - trunc_page(offset); 443 error = copyout((caddr_t)sf_buf_kva(sf) + off, (caddr_t)start, 444 end - start); 445 vm_imgact_unmap_page(sf); 446 if (error != 0) 447 return (KERN_FAILURE); 448 } 449 450 return (KERN_SUCCESS); 451 } 452 453 static int 454 __elfN(map_insert)(struct image_params *imgp, vm_map_t map, vm_object_t object, 455 vm_ooffset_t offset, vm_offset_t start, vm_offset_t end, vm_prot_t prot, 456 int cow) 457 { 458 struct sf_buf *sf; 459 vm_offset_t off; 460 vm_size_t sz; 461 int error, locked, rv; 462 463 if (start != trunc_page(start)) { 464 rv = __elfN(map_partial)(map, object, offset, start, 465 round_page(start), prot); 466 if (rv != KERN_SUCCESS) 467 return (rv); 468 offset += round_page(start) - start; 469 start = round_page(start); 470 } 471 if (end != round_page(end)) { 472 rv = __elfN(map_partial)(map, object, offset + 473 trunc_page(end) - start, trunc_page(end), end, prot); 474 if (rv != KERN_SUCCESS) 475 return (rv); 476 end = trunc_page(end); 477 } 478 if (start >= end) 479 return (KERN_SUCCESS); 480 if ((offset & PAGE_MASK) != 0) { 481 /* 482 * The mapping is not page aligned. This means that we have 483 * to copy the data. 484 */ 485 rv = vm_map_fixed(map, NULL, 0, start, end - start, 486 prot | VM_PROT_WRITE, VM_PROT_ALL, MAP_CHECK_EXCL); 487 if (rv != KERN_SUCCESS) 488 return (rv); 489 if (object == NULL) 490 return (KERN_SUCCESS); 491 for (; start < end; start += sz) { 492 sf = vm_imgact_map_page(object, offset); 493 if (sf == NULL) 494 return (KERN_FAILURE); 495 off = offset - trunc_page(offset); 496 sz = end - start; 497 if (sz > PAGE_SIZE - off) 498 sz = PAGE_SIZE - off; 499 error = copyout((caddr_t)sf_buf_kva(sf) + off, 500 (caddr_t)start, sz); 501 vm_imgact_unmap_page(sf); 502 if (error != 0) 503 return (KERN_FAILURE); 504 offset += sz; 505 } 506 } else { 507 vm_object_reference(object); 508 rv = vm_map_fixed(map, object, offset, start, end - start, 509 prot, VM_PROT_ALL, cow | MAP_CHECK_EXCL); 510 if (rv != KERN_SUCCESS) { 511 locked = VOP_ISLOCKED(imgp->vp); 512 VOP_UNLOCK(imgp->vp, 0); 513 vm_object_deallocate(object); 514 vn_lock(imgp->vp, locked | LK_RETRY); 515 return (rv); 516 } 517 } 518 return (KERN_SUCCESS); 519 } 520 521 static int 522 __elfN(load_section)(struct image_params *imgp, vm_ooffset_t offset, 523 caddr_t vmaddr, size_t memsz, size_t filsz, vm_prot_t prot, 524 size_t pagesize) 525 { 526 struct sf_buf *sf; 527 size_t map_len; 528 vm_map_t map; 529 vm_object_t object; 530 vm_offset_t off, map_addr; 531 int error, rv, cow; 532 size_t copy_len; 533 vm_ooffset_t file_addr; 534 535 /* 536 * It's necessary to fail if the filsz + offset taken from the 537 * header is greater than the actual file pager object's size. 538 * If we were to allow this, then the vm_map_find() below would 539 * walk right off the end of the file object and into the ether. 540 * 541 * While I'm here, might as well check for something else that 542 * is invalid: filsz cannot be greater than memsz. 543 */ 544 if ((filsz != 0 && (off_t)filsz + offset > imgp->attr->va_size) || 545 filsz > memsz) { 546 uprintf("elf_load_section: truncated ELF file\n"); 547 return (ENOEXEC); 548 } 549 550 object = imgp->object; 551 map = &imgp->proc->p_vmspace->vm_map; 552 map_addr = trunc_page_ps((vm_offset_t)vmaddr, pagesize); 553 file_addr = trunc_page_ps(offset, pagesize); 554 555 /* 556 * We have two choices. We can either clear the data in the last page 557 * of an oversized mapping, or we can start the anon mapping a page 558 * early and copy the initialized data into that first page. We 559 * choose the second. 560 */ 561 if (filsz == 0) 562 map_len = 0; 563 else if (memsz > filsz) 564 map_len = trunc_page_ps(offset + filsz, pagesize) - file_addr; 565 else 566 map_len = round_page_ps(offset + filsz, pagesize) - file_addr; 567 568 if (map_len != 0) { 569 /* cow flags: don't dump readonly sections in core */ 570 cow = MAP_COPY_ON_WRITE | MAP_PREFAULT | 571 (prot & VM_PROT_WRITE ? 0 : MAP_DISABLE_COREDUMP); 572 573 rv = __elfN(map_insert)(imgp, map, 574 object, 575 file_addr, /* file offset */ 576 map_addr, /* virtual start */ 577 map_addr + map_len,/* virtual end */ 578 prot, 579 cow); 580 if (rv != KERN_SUCCESS) 581 return (EINVAL); 582 583 /* we can stop now if we've covered it all */ 584 if (memsz == filsz) 585 return (0); 586 } 587 588 589 /* 590 * We have to get the remaining bit of the file into the first part 591 * of the oversized map segment. This is normally because the .data 592 * segment in the file is extended to provide bss. It's a neat idea 593 * to try and save a page, but it's a pain in the behind to implement. 594 */ 595 copy_len = filsz == 0 ? 0 : (offset + filsz) - trunc_page_ps(offset + 596 filsz, pagesize); 597 map_addr = trunc_page_ps((vm_offset_t)vmaddr + filsz, pagesize); 598 map_len = round_page_ps((vm_offset_t)vmaddr + memsz, pagesize) - 599 map_addr; 600 601 /* This had damn well better be true! */ 602 if (map_len != 0) { 603 rv = __elfN(map_insert)(imgp, map, NULL, 0, map_addr, 604 map_addr + map_len, prot, 0); 605 if (rv != KERN_SUCCESS) 606 return (EINVAL); 607 } 608 609 if (copy_len != 0) { 610 sf = vm_imgact_map_page(object, offset + filsz); 611 if (sf == NULL) 612 return (EIO); 613 614 /* send the page fragment to user space */ 615 off = trunc_page_ps(offset + filsz, pagesize) - 616 trunc_page(offset + filsz); 617 error = copyout((caddr_t)sf_buf_kva(sf) + off, 618 (caddr_t)map_addr, copy_len); 619 vm_imgact_unmap_page(sf); 620 if (error != 0) 621 return (error); 622 } 623 624 /* 625 * Remove write access to the page if it was only granted by map_insert 626 * to allow copyout. 627 */ 628 if ((prot & VM_PROT_WRITE) == 0) 629 vm_map_protect(map, trunc_page(map_addr), round_page(map_addr + 630 map_len), prot, FALSE); 631 632 return (0); 633 } 634 635 /* 636 * Load the file "file" into memory. It may be either a shared object 637 * or an executable. 638 * 639 * The "addr" reference parameter is in/out. On entry, it specifies 640 * the address where a shared object should be loaded. If the file is 641 * an executable, this value is ignored. On exit, "addr" specifies 642 * where the file was actually loaded. 643 * 644 * The "entry" reference parameter is out only. On exit, it specifies 645 * the entry point for the loaded file. 646 */ 647 static int 648 __elfN(load_file)(struct proc *p, const char *file, u_long *addr, 649 u_long *entry, size_t pagesize) 650 { 651 struct { 652 struct nameidata nd; 653 struct vattr attr; 654 struct image_params image_params; 655 } *tempdata; 656 const Elf_Ehdr *hdr = NULL; 657 const Elf_Phdr *phdr = NULL; 658 struct nameidata *nd; 659 struct vattr *attr; 660 struct image_params *imgp; 661 vm_prot_t prot; 662 u_long rbase; 663 u_long base_addr = 0; 664 int error, i, numsegs; 665 666 #ifdef CAPABILITY_MODE 667 /* 668 * XXXJA: This check can go away once we are sufficiently confident 669 * that the checks in namei() are correct. 670 */ 671 if (IN_CAPABILITY_MODE(curthread)) 672 return (ECAPMODE); 673 #endif 674 675 tempdata = malloc(sizeof(*tempdata), M_TEMP, M_WAITOK); 676 nd = &tempdata->nd; 677 attr = &tempdata->attr; 678 imgp = &tempdata->image_params; 679 680 /* 681 * Initialize part of the common data 682 */ 683 imgp->proc = p; 684 imgp->attr = attr; 685 imgp->firstpage = NULL; 686 imgp->image_header = NULL; 687 imgp->object = NULL; 688 imgp->execlabel = NULL; 689 690 NDINIT(nd, LOOKUP, LOCKLEAF | FOLLOW, UIO_SYSSPACE, file, curthread); 691 if ((error = namei(nd)) != 0) { 692 nd->ni_vp = NULL; 693 goto fail; 694 } 695 NDFREE(nd, NDF_ONLY_PNBUF); 696 imgp->vp = nd->ni_vp; 697 698 /* 699 * Check permissions, modes, uid, etc on the file, and "open" it. 700 */ 701 error = exec_check_permissions(imgp); 702 if (error) 703 goto fail; 704 705 error = exec_map_first_page(imgp); 706 if (error) 707 goto fail; 708 709 /* 710 * Also make certain that the interpreter stays the same, so set 711 * its VV_TEXT flag, too. 712 */ 713 VOP_SET_TEXT(nd->ni_vp); 714 715 imgp->object = nd->ni_vp->v_object; 716 717 hdr = (const Elf_Ehdr *)imgp->image_header; 718 if ((error = __elfN(check_header)(hdr)) != 0) 719 goto fail; 720 if (hdr->e_type == ET_DYN) 721 rbase = *addr; 722 else if (hdr->e_type == ET_EXEC) 723 rbase = 0; 724 else { 725 error = ENOEXEC; 726 goto fail; 727 } 728 729 /* Only support headers that fit within first page for now */ 730 if ((hdr->e_phoff > PAGE_SIZE) || 731 (u_int)hdr->e_phentsize * hdr->e_phnum > PAGE_SIZE - hdr->e_phoff) { 732 error = ENOEXEC; 733 goto fail; 734 } 735 736 phdr = (const Elf_Phdr *)(imgp->image_header + hdr->e_phoff); 737 if (!aligned(phdr, Elf_Addr)) { 738 error = ENOEXEC; 739 goto fail; 740 } 741 742 for (i = 0, numsegs = 0; i < hdr->e_phnum; i++) { 743 if (phdr[i].p_type == PT_LOAD && phdr[i].p_memsz != 0) { 744 /* Loadable segment */ 745 prot = __elfN(trans_prot)(phdr[i].p_flags); 746 error = __elfN(load_section)(imgp, phdr[i].p_offset, 747 (caddr_t)(uintptr_t)phdr[i].p_vaddr + rbase, 748 phdr[i].p_memsz, phdr[i].p_filesz, prot, pagesize); 749 if (error != 0) 750 goto fail; 751 /* 752 * Establish the base address if this is the 753 * first segment. 754 */ 755 if (numsegs == 0) 756 base_addr = trunc_page(phdr[i].p_vaddr + 757 rbase); 758 numsegs++; 759 } 760 } 761 *addr = base_addr; 762 *entry = (unsigned long)hdr->e_entry + rbase; 763 764 fail: 765 if (imgp->firstpage) 766 exec_unmap_first_page(imgp); 767 768 if (nd->ni_vp) 769 vput(nd->ni_vp); 770 771 free(tempdata, M_TEMP); 772 773 return (error); 774 } 775 776 static int 777 __CONCAT(exec_, __elfN(imgact))(struct image_params *imgp) 778 { 779 struct thread *td; 780 const Elf_Ehdr *hdr; 781 const Elf_Phdr *phdr; 782 Elf_Auxargs *elf_auxargs; 783 struct vmspace *vmspace; 784 const char *err_str, *newinterp; 785 char *interp, *interp_buf, *path; 786 Elf_Brandinfo *brand_info; 787 struct sysentvec *sv; 788 vm_prot_t prot; 789 u_long text_size, data_size, total_size, text_addr, data_addr; 790 u_long seg_size, seg_addr, addr, baddr, et_dyn_addr, entry, proghdr; 791 int32_t osrel; 792 int error, i, n, interp_name_len, have_interp; 793 794 hdr = (const Elf_Ehdr *)imgp->image_header; 795 796 /* 797 * Do we have a valid ELF header ? 798 * 799 * Only allow ET_EXEC & ET_DYN here, reject ET_DYN later 800 * if particular brand doesn't support it. 801 */ 802 if (__elfN(check_header)(hdr) != 0 || 803 (hdr->e_type != ET_EXEC && hdr->e_type != ET_DYN)) 804 return (-1); 805 806 /* 807 * From here on down, we return an errno, not -1, as we've 808 * detected an ELF file. 809 */ 810 811 if ((hdr->e_phoff > PAGE_SIZE) || 812 (u_int)hdr->e_phentsize * hdr->e_phnum > PAGE_SIZE - hdr->e_phoff) { 813 /* Only support headers in first page for now */ 814 uprintf("Program headers not in the first page\n"); 815 return (ENOEXEC); 816 } 817 phdr = (const Elf_Phdr *)(imgp->image_header + hdr->e_phoff); 818 if (!aligned(phdr, Elf_Addr)) { 819 uprintf("Unaligned program headers\n"); 820 return (ENOEXEC); 821 } 822 823 n = error = 0; 824 baddr = 0; 825 osrel = 0; 826 text_size = data_size = total_size = text_addr = data_addr = 0; 827 entry = proghdr = 0; 828 interp_name_len = 0; 829 err_str = newinterp = NULL; 830 interp = interp_buf = NULL; 831 td = curthread; 832 833 for (i = 0; i < hdr->e_phnum; i++) { 834 switch (phdr[i].p_type) { 835 case PT_LOAD: 836 if (n == 0) 837 baddr = phdr[i].p_vaddr; 838 n++; 839 break; 840 case PT_INTERP: 841 /* Path to interpreter */ 842 if (phdr[i].p_filesz < 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 %d\n", 866 error); 867 goto ret; 868 } 869 interp_buf[interp_name_len] = '\0'; 870 interp = interp_buf; 871 } else { 872 interp = __DECONST(char *, imgp->image_header) + 873 phdr[i].p_offset; 874 if (interp[interp_name_len - 1] != '\0') { 875 uprintf("Invalid PT_INTERP\n"); 876 error = ENOEXEC; 877 goto ret; 878 } 879 } 880 break; 881 case PT_GNU_STACK: 882 if (__elfN(nxstack)) 883 imgp->stack_prot = 884 __elfN(trans_prot)(phdr[i].p_flags); 885 imgp->stack_sz = phdr[i].p_memsz; 886 break; 887 } 888 } 889 890 brand_info = __elfN(get_brandinfo)(imgp, interp, interp_name_len, 891 &osrel); 892 if (brand_info == NULL) { 893 uprintf("ELF binary type \"%u\" not known.\n", 894 hdr->e_ident[EI_OSABI]); 895 error = ENOEXEC; 896 goto ret; 897 } 898 et_dyn_addr = 0; 899 if (hdr->e_type == ET_DYN) { 900 if ((brand_info->flags & BI_CAN_EXEC_DYN) == 0) { 901 uprintf("Cannot execute shared object\n"); 902 error = ENOEXEC; 903 goto ret; 904 } 905 /* 906 * Honour the base load address from the dso if it is 907 * non-zero for some reason. 908 */ 909 if (baddr == 0) 910 et_dyn_addr = ET_DYN_LOAD_ADDR; 911 } 912 sv = brand_info->sysvec; 913 if (interp != NULL && brand_info->interp_newpath != NULL) 914 newinterp = brand_info->interp_newpath; 915 916 /* 917 * Avoid a possible deadlock if the current address space is destroyed 918 * and that address space maps the locked vnode. In the common case, 919 * the locked vnode's v_usecount is decremented but remains greater 920 * than zero. Consequently, the vnode lock is not needed by vrele(). 921 * However, in cases where the vnode lock is external, such as nullfs, 922 * v_usecount may become zero. 923 * 924 * The VV_TEXT flag prevents modifications to the executable while 925 * the vnode is unlocked. 926 */ 927 VOP_UNLOCK(imgp->vp, 0); 928 929 error = exec_new_vmspace(imgp, sv); 930 imgp->proc->p_sysent = sv; 931 932 vn_lock(imgp->vp, LK_EXCLUSIVE | LK_RETRY); 933 if (error != 0) 934 goto ret; 935 936 for (i = 0; i < hdr->e_phnum; i++) { 937 switch (phdr[i].p_type) { 938 case PT_LOAD: /* Loadable segment */ 939 if (phdr[i].p_memsz == 0) 940 break; 941 prot = __elfN(trans_prot)(phdr[i].p_flags); 942 error = __elfN(load_section)(imgp, phdr[i].p_offset, 943 (caddr_t)(uintptr_t)phdr[i].p_vaddr + et_dyn_addr, 944 phdr[i].p_memsz, phdr[i].p_filesz, prot, 945 sv->sv_pagesize); 946 if (error != 0) 947 goto ret; 948 949 /* 950 * If this segment contains the program headers, 951 * remember their virtual address for the AT_PHDR 952 * aux entry. Static binaries don't usually include 953 * a PT_PHDR entry. 954 */ 955 if (phdr[i].p_offset == 0 && 956 hdr->e_phoff + hdr->e_phnum * hdr->e_phentsize 957 <= phdr[i].p_filesz) 958 proghdr = phdr[i].p_vaddr + hdr->e_phoff + 959 et_dyn_addr; 960 961 seg_addr = trunc_page(phdr[i].p_vaddr + et_dyn_addr); 962 seg_size = round_page(phdr[i].p_memsz + 963 phdr[i].p_vaddr + et_dyn_addr - seg_addr); 964 965 /* 966 * Make the largest executable segment the official 967 * text segment and all others data. 968 * 969 * Note that obreak() assumes that data_addr + 970 * data_size == end of data load area, and the ELF 971 * file format expects segments to be sorted by 972 * address. If multiple data segments exist, the 973 * last one will be used. 974 */ 975 976 if (phdr[i].p_flags & PF_X && text_size < seg_size) { 977 text_size = seg_size; 978 text_addr = seg_addr; 979 } else { 980 data_size = seg_size; 981 data_addr = seg_addr; 982 } 983 total_size += seg_size; 984 break; 985 case PT_PHDR: /* Program header table info */ 986 proghdr = phdr[i].p_vaddr + et_dyn_addr; 987 break; 988 default: 989 break; 990 } 991 } 992 993 if (data_addr == 0 && data_size == 0) { 994 data_addr = text_addr; 995 data_size = text_size; 996 } 997 998 entry = (u_long)hdr->e_entry + et_dyn_addr; 999 1000 /* 1001 * Check limits. It should be safe to check the 1002 * limits after loading the segments since we do 1003 * not actually fault in all the segments pages. 1004 */ 1005 PROC_LOCK(imgp->proc); 1006 if (data_size > lim_cur_proc(imgp->proc, RLIMIT_DATA)) 1007 err_str = "Data segment size exceeds process limit"; 1008 else if (text_size > maxtsiz) 1009 err_str = "Text segment size exceeds system limit"; 1010 else if (total_size > lim_cur_proc(imgp->proc, RLIMIT_VMEM)) 1011 err_str = "Total segment size exceeds process limit"; 1012 else if (racct_set(imgp->proc, RACCT_DATA, data_size) != 0) 1013 err_str = "Data segment size exceeds resource limit"; 1014 else if (racct_set(imgp->proc, RACCT_VMEM, total_size) != 0) 1015 err_str = "Total segment size exceeds resource limit"; 1016 if (err_str != NULL) { 1017 PROC_UNLOCK(imgp->proc); 1018 uprintf("%s\n", err_str); 1019 error = ENOMEM; 1020 goto ret; 1021 } 1022 1023 vmspace = imgp->proc->p_vmspace; 1024 vmspace->vm_tsize = text_size >> PAGE_SHIFT; 1025 vmspace->vm_taddr = (caddr_t)(uintptr_t)text_addr; 1026 vmspace->vm_dsize = data_size >> PAGE_SHIFT; 1027 vmspace->vm_daddr = (caddr_t)(uintptr_t)data_addr; 1028 1029 /* 1030 * We load the dynamic linker where a userland call 1031 * to mmap(0, ...) would put it. The rationale behind this 1032 * calculation is that it leaves room for the heap to grow to 1033 * its maximum allowed size. 1034 */ 1035 addr = round_page((vm_offset_t)vmspace->vm_daddr + lim_max(td, 1036 RLIMIT_DATA)); 1037 PROC_UNLOCK(imgp->proc); 1038 1039 imgp->entry_addr = entry; 1040 1041 if (interp != NULL) { 1042 have_interp = FALSE; 1043 VOP_UNLOCK(imgp->vp, 0); 1044 if (brand_info->emul_path != NULL && 1045 brand_info->emul_path[0] != '\0') { 1046 path = malloc(MAXPATHLEN, M_TEMP, M_WAITOK); 1047 snprintf(path, MAXPATHLEN, "%s%s", 1048 brand_info->emul_path, interp); 1049 error = __elfN(load_file)(imgp->proc, path, &addr, 1050 &imgp->entry_addr, sv->sv_pagesize); 1051 free(path, M_TEMP); 1052 if (error == 0) 1053 have_interp = TRUE; 1054 } 1055 if (!have_interp && newinterp != NULL && 1056 (brand_info->interp_path == NULL || 1057 strcmp(interp, brand_info->interp_path) == 0)) { 1058 error = __elfN(load_file)(imgp->proc, newinterp, &addr, 1059 &imgp->entry_addr, sv->sv_pagesize); 1060 if (error == 0) 1061 have_interp = TRUE; 1062 } 1063 if (!have_interp) { 1064 error = __elfN(load_file)(imgp->proc, interp, &addr, 1065 &imgp->entry_addr, sv->sv_pagesize); 1066 } 1067 vn_lock(imgp->vp, LK_EXCLUSIVE | LK_RETRY); 1068 if (error != 0) { 1069 uprintf("ELF interpreter %s not found, error %d\n", 1070 interp, error); 1071 goto ret; 1072 } 1073 } else 1074 addr = et_dyn_addr; 1075 1076 /* 1077 * Construct auxargs table (used by the fixup routine) 1078 */ 1079 elf_auxargs = malloc(sizeof(Elf_Auxargs), M_TEMP, M_WAITOK); 1080 elf_auxargs->execfd = -1; 1081 elf_auxargs->phdr = proghdr; 1082 elf_auxargs->phent = hdr->e_phentsize; 1083 elf_auxargs->phnum = hdr->e_phnum; 1084 elf_auxargs->pagesz = PAGE_SIZE; 1085 elf_auxargs->base = addr; 1086 elf_auxargs->flags = 0; 1087 elf_auxargs->entry = entry; 1088 elf_auxargs->hdr_eflags = hdr->e_flags; 1089 1090 imgp->auxargs = elf_auxargs; 1091 imgp->interpreted = 0; 1092 imgp->reloc_base = addr; 1093 imgp->proc->p_osrel = osrel; 1094 imgp->proc->p_elf_machine = hdr->e_machine; 1095 imgp->proc->p_elf_flags = hdr->e_flags; 1096 1097 ret: 1098 free(interp_buf, M_TEMP); 1099 return (error); 1100 } 1101 1102 #define suword __CONCAT(suword, __ELF_WORD_SIZE) 1103 1104 int 1105 __elfN(freebsd_fixup)(register_t **stack_base, struct image_params *imgp) 1106 { 1107 Elf_Auxargs *args = (Elf_Auxargs *)imgp->auxargs; 1108 Elf_Auxinfo *argarray, *pos; 1109 Elf_Addr *base, *auxbase; 1110 int error; 1111 1112 base = (Elf_Addr *)*stack_base; 1113 auxbase = base + imgp->args->argc + 1 + imgp->args->envc + 1; 1114 argarray = pos = malloc(AT_COUNT * sizeof(*pos), M_TEMP, 1115 M_WAITOK | M_ZERO); 1116 1117 if (args->execfd != -1) 1118 AUXARGS_ENTRY(pos, AT_EXECFD, args->execfd); 1119 AUXARGS_ENTRY(pos, AT_PHDR, args->phdr); 1120 AUXARGS_ENTRY(pos, AT_PHENT, args->phent); 1121 AUXARGS_ENTRY(pos, AT_PHNUM, args->phnum); 1122 AUXARGS_ENTRY(pos, AT_PAGESZ, args->pagesz); 1123 AUXARGS_ENTRY(pos, AT_FLAGS, args->flags); 1124 AUXARGS_ENTRY(pos, AT_ENTRY, args->entry); 1125 AUXARGS_ENTRY(pos, AT_BASE, args->base); 1126 AUXARGS_ENTRY(pos, AT_EHDRFLAGS, args->hdr_eflags); 1127 if (imgp->execpathp != 0) 1128 AUXARGS_ENTRY(pos, AT_EXECPATH, imgp->execpathp); 1129 AUXARGS_ENTRY(pos, AT_OSRELDATE, 1130 imgp->proc->p_ucred->cr_prison->pr_osreldate); 1131 if (imgp->canary != 0) { 1132 AUXARGS_ENTRY(pos, AT_CANARY, imgp->canary); 1133 AUXARGS_ENTRY(pos, AT_CANARYLEN, imgp->canarylen); 1134 } 1135 AUXARGS_ENTRY(pos, AT_NCPUS, mp_ncpus); 1136 if (imgp->pagesizes != 0) { 1137 AUXARGS_ENTRY(pos, AT_PAGESIZES, imgp->pagesizes); 1138 AUXARGS_ENTRY(pos, AT_PAGESIZESLEN, imgp->pagesizeslen); 1139 } 1140 if (imgp->sysent->sv_timekeep_base != 0) { 1141 AUXARGS_ENTRY(pos, AT_TIMEKEEP, 1142 imgp->sysent->sv_timekeep_base); 1143 } 1144 AUXARGS_ENTRY(pos, AT_STACKPROT, imgp->sysent->sv_shared_page_obj 1145 != NULL && imgp->stack_prot != 0 ? imgp->stack_prot : 1146 imgp->sysent->sv_stackprot); 1147 if (imgp->sysent->sv_hwcap != NULL) 1148 AUXARGS_ENTRY(pos, AT_HWCAP, *imgp->sysent->sv_hwcap); 1149 if (imgp->sysent->sv_hwcap2 != NULL) 1150 AUXARGS_ENTRY(pos, AT_HWCAP2, *imgp->sysent->sv_hwcap2); 1151 AUXARGS_ENTRY(pos, AT_NULL, 0); 1152 1153 free(imgp->auxargs, M_TEMP); 1154 imgp->auxargs = NULL; 1155 KASSERT(pos - argarray <= AT_COUNT, ("Too many auxargs")); 1156 1157 error = copyout(argarray, auxbase, sizeof(*argarray) * AT_COUNT); 1158 free(argarray, M_TEMP); 1159 if (error != 0) 1160 return (error); 1161 1162 base--; 1163 if (suword(base, imgp->args->argc) == -1) 1164 return (EFAULT); 1165 *stack_base = (register_t *)base; 1166 return (0); 1167 } 1168 1169 /* 1170 * Code for generating ELF core dumps. 1171 */ 1172 1173 typedef void (*segment_callback)(vm_map_entry_t, void *); 1174 1175 /* Closure for cb_put_phdr(). */ 1176 struct phdr_closure { 1177 Elf_Phdr *phdr; /* Program header to fill in */ 1178 Elf_Off offset; /* Offset of segment in core file */ 1179 }; 1180 1181 /* Closure for cb_size_segment(). */ 1182 struct sseg_closure { 1183 int count; /* Count of writable segments. */ 1184 size_t size; /* Total size of all writable segments. */ 1185 }; 1186 1187 typedef void (*outfunc_t)(void *, struct sbuf *, size_t *); 1188 1189 struct note_info { 1190 int type; /* Note type. */ 1191 outfunc_t outfunc; /* Output function. */ 1192 void *outarg; /* Argument for the output function. */ 1193 size_t outsize; /* Output size. */ 1194 TAILQ_ENTRY(note_info) link; /* Link to the next note info. */ 1195 }; 1196 1197 TAILQ_HEAD(note_info_list, note_info); 1198 1199 /* Coredump output parameters. */ 1200 struct coredump_params { 1201 off_t offset; 1202 struct ucred *active_cred; 1203 struct ucred *file_cred; 1204 struct thread *td; 1205 struct vnode *vp; 1206 struct compressor *comp; 1207 }; 1208 1209 extern int compress_user_cores; 1210 extern int compress_user_cores_level; 1211 1212 static void cb_put_phdr(vm_map_entry_t, void *); 1213 static void cb_size_segment(vm_map_entry_t, void *); 1214 static int core_write(struct coredump_params *, const void *, size_t, off_t, 1215 enum uio_seg); 1216 static void each_dumpable_segment(struct thread *, segment_callback, void *); 1217 static int __elfN(corehdr)(struct coredump_params *, int, void *, size_t, 1218 struct note_info_list *, size_t); 1219 static void __elfN(prepare_notes)(struct thread *, struct note_info_list *, 1220 size_t *); 1221 static void __elfN(puthdr)(struct thread *, void *, size_t, int, size_t); 1222 static void __elfN(putnote)(struct note_info *, struct sbuf *); 1223 static size_t register_note(struct note_info_list *, int, outfunc_t, void *); 1224 static int sbuf_drain_core_output(void *, const char *, int); 1225 static int sbuf_drain_count(void *arg, const char *data, int len); 1226 1227 static void __elfN(note_fpregset)(void *, struct sbuf *, size_t *); 1228 static void __elfN(note_prpsinfo)(void *, struct sbuf *, size_t *); 1229 static void __elfN(note_prstatus)(void *, struct sbuf *, size_t *); 1230 static void __elfN(note_threadmd)(void *, struct sbuf *, size_t *); 1231 static void __elfN(note_thrmisc)(void *, struct sbuf *, size_t *); 1232 static void __elfN(note_ptlwpinfo)(void *, struct sbuf *, size_t *); 1233 static void __elfN(note_procstat_auxv)(void *, struct sbuf *, size_t *); 1234 static void __elfN(note_procstat_proc)(void *, struct sbuf *, size_t *); 1235 static void __elfN(note_procstat_psstrings)(void *, struct sbuf *, size_t *); 1236 static void note_procstat_files(void *, struct sbuf *, size_t *); 1237 static void note_procstat_groups(void *, struct sbuf *, size_t *); 1238 static void note_procstat_osrel(void *, struct sbuf *, size_t *); 1239 static void note_procstat_rlimit(void *, struct sbuf *, size_t *); 1240 static void note_procstat_umask(void *, struct sbuf *, size_t *); 1241 static void note_procstat_vmmap(void *, struct sbuf *, size_t *); 1242 1243 /* 1244 * Write out a core segment to the compression stream. 1245 */ 1246 static int 1247 compress_chunk(struct coredump_params *p, char *base, char *buf, u_int len) 1248 { 1249 u_int chunk_len; 1250 int error; 1251 1252 while (len > 0) { 1253 chunk_len = MIN(len, CORE_BUF_SIZE); 1254 1255 /* 1256 * We can get EFAULT error here. 1257 * In that case zero out the current chunk of the segment. 1258 */ 1259 error = copyin(base, buf, chunk_len); 1260 if (error != 0) 1261 bzero(buf, chunk_len); 1262 error = compressor_write(p->comp, buf, chunk_len); 1263 if (error != 0) 1264 break; 1265 base += chunk_len; 1266 len -= chunk_len; 1267 } 1268 return (error); 1269 } 1270 1271 static int 1272 core_compressed_write(void *base, size_t len, off_t offset, void *arg) 1273 { 1274 1275 return (core_write((struct coredump_params *)arg, base, len, offset, 1276 UIO_SYSSPACE)); 1277 } 1278 1279 static int 1280 core_write(struct coredump_params *p, const void *base, size_t len, 1281 off_t offset, enum uio_seg seg) 1282 { 1283 1284 return (vn_rdwr_inchunks(UIO_WRITE, p->vp, __DECONST(void *, base), 1285 len, offset, seg, IO_UNIT | IO_DIRECT | IO_RANGELOCKED, 1286 p->active_cred, p->file_cred, NULL, p->td)); 1287 } 1288 1289 static int 1290 core_output(void *base, size_t len, off_t offset, struct coredump_params *p, 1291 void *tmpbuf) 1292 { 1293 int error; 1294 1295 if (p->comp != NULL) 1296 return (compress_chunk(p, base, tmpbuf, len)); 1297 1298 /* 1299 * EFAULT is a non-fatal error that we can get, for example, 1300 * if the segment is backed by a file but extends beyond its 1301 * end. 1302 */ 1303 error = core_write(p, base, len, offset, UIO_USERSPACE); 1304 if (error == EFAULT) { 1305 log(LOG_WARNING, "Failed to fully fault in a core file segment " 1306 "at VA %p with size 0x%zx to be written at offset 0x%jx " 1307 "for process %s\n", base, len, offset, curproc->p_comm); 1308 1309 /* 1310 * Write a "real" zero byte at the end of the target region 1311 * in the case this is the last segment. 1312 * The intermediate space will be implicitly zero-filled. 1313 */ 1314 error = core_write(p, zero_region, 1, offset + len - 1, 1315 UIO_SYSSPACE); 1316 } 1317 return (error); 1318 } 1319 1320 /* 1321 * Drain into a core file. 1322 */ 1323 static int 1324 sbuf_drain_core_output(void *arg, const char *data, int len) 1325 { 1326 struct coredump_params *p; 1327 int error, locked; 1328 1329 p = (struct coredump_params *)arg; 1330 1331 /* 1332 * Some kern_proc out routines that print to this sbuf may 1333 * call us with the process lock held. Draining with the 1334 * non-sleepable lock held is unsafe. The lock is needed for 1335 * those routines when dumping a live process. In our case we 1336 * can safely release the lock before draining and acquire 1337 * again after. 1338 */ 1339 locked = PROC_LOCKED(p->td->td_proc); 1340 if (locked) 1341 PROC_UNLOCK(p->td->td_proc); 1342 if (p->comp != NULL) 1343 error = compressor_write(p->comp, __DECONST(char *, data), len); 1344 else 1345 error = core_write(p, __DECONST(void *, data), len, p->offset, 1346 UIO_SYSSPACE); 1347 if (locked) 1348 PROC_LOCK(p->td->td_proc); 1349 if (error != 0) 1350 return (-error); 1351 p->offset += len; 1352 return (len); 1353 } 1354 1355 /* 1356 * Drain into a counter. 1357 */ 1358 static int 1359 sbuf_drain_count(void *arg, const char *data __unused, int len) 1360 { 1361 size_t *sizep; 1362 1363 sizep = (size_t *)arg; 1364 *sizep += len; 1365 return (len); 1366 } 1367 1368 int 1369 __elfN(coredump)(struct thread *td, struct vnode *vp, off_t limit, int flags) 1370 { 1371 struct ucred *cred = td->td_ucred; 1372 int error = 0; 1373 struct sseg_closure seginfo; 1374 struct note_info_list notelst; 1375 struct coredump_params params; 1376 struct note_info *ninfo; 1377 void *hdr, *tmpbuf; 1378 size_t hdrsize, notesz, coresize; 1379 1380 hdr = NULL; 1381 tmpbuf = NULL; 1382 TAILQ_INIT(¬elst); 1383 1384 /* Size the program segments. */ 1385 seginfo.count = 0; 1386 seginfo.size = 0; 1387 each_dumpable_segment(td, cb_size_segment, &seginfo); 1388 1389 /* 1390 * Collect info about the core file header area. 1391 */ 1392 hdrsize = sizeof(Elf_Ehdr) + sizeof(Elf_Phdr) * (1 + seginfo.count); 1393 if (seginfo.count + 1 >= PN_XNUM) 1394 hdrsize += sizeof(Elf_Shdr); 1395 __elfN(prepare_notes)(td, ¬elst, ¬esz); 1396 coresize = round_page(hdrsize + notesz) + seginfo.size; 1397 1398 /* Set up core dump parameters. */ 1399 params.offset = 0; 1400 params.active_cred = cred; 1401 params.file_cred = NOCRED; 1402 params.td = td; 1403 params.vp = vp; 1404 params.comp = NULL; 1405 1406 #ifdef RACCT 1407 if (racct_enable) { 1408 PROC_LOCK(td->td_proc); 1409 error = racct_add(td->td_proc, RACCT_CORE, coresize); 1410 PROC_UNLOCK(td->td_proc); 1411 if (error != 0) { 1412 error = EFAULT; 1413 goto done; 1414 } 1415 } 1416 #endif 1417 if (coresize >= limit) { 1418 error = EFAULT; 1419 goto done; 1420 } 1421 1422 /* Create a compression stream if necessary. */ 1423 if (compress_user_cores != 0) { 1424 params.comp = compressor_init(core_compressed_write, 1425 compress_user_cores, CORE_BUF_SIZE, 1426 compress_user_cores_level, ¶ms); 1427 if (params.comp == NULL) { 1428 error = EFAULT; 1429 goto done; 1430 } 1431 tmpbuf = malloc(CORE_BUF_SIZE, M_TEMP, M_WAITOK | M_ZERO); 1432 } 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 if (error == 0 && params.comp != NULL) 1459 error = compressor_flush(params.comp); 1460 } 1461 if (error) { 1462 log(LOG_WARNING, 1463 "Failed to write core file for process %s (error %d)\n", 1464 curproc->p_comm, error); 1465 } 1466 1467 done: 1468 free(tmpbuf, M_TEMP); 1469 if (params.comp != NULL) 1470 compressor_fini(params.comp); 1471 while ((ninfo = TAILQ_FIRST(¬elst)) != NULL) { 1472 TAILQ_REMOVE(¬elst, ninfo, link); 1473 free(ninfo, M_TEMP); 1474 } 1475 if (hdr != NULL) 1476 free(hdr, M_TEMP); 1477 1478 return (error); 1479 } 1480 1481 /* 1482 * A callback for each_dumpable_segment() to write out the segment's 1483 * program header entry. 1484 */ 1485 static void 1486 cb_put_phdr(vm_map_entry_t entry, void *closure) 1487 { 1488 struct phdr_closure *phc = (struct phdr_closure *)closure; 1489 Elf_Phdr *phdr = phc->phdr; 1490 1491 phc->offset = round_page(phc->offset); 1492 1493 phdr->p_type = PT_LOAD; 1494 phdr->p_offset = phc->offset; 1495 phdr->p_vaddr = entry->start; 1496 phdr->p_paddr = 0; 1497 phdr->p_filesz = phdr->p_memsz = entry->end - entry->start; 1498 phdr->p_align = PAGE_SIZE; 1499 phdr->p_flags = __elfN(untrans_prot)(entry->protection); 1500 1501 phc->offset += phdr->p_filesz; 1502 phc->phdr++; 1503 } 1504 1505 /* 1506 * A callback for each_dumpable_segment() to gather information about 1507 * the number of segments and their total size. 1508 */ 1509 static void 1510 cb_size_segment(vm_map_entry_t entry, void *closure) 1511 { 1512 struct sseg_closure *ssc = (struct sseg_closure *)closure; 1513 1514 ssc->count++; 1515 ssc->size += entry->end - entry->start; 1516 } 1517 1518 /* 1519 * For each writable segment in the process's memory map, call the given 1520 * function with a pointer to the map entry and some arbitrary 1521 * caller-supplied data. 1522 */ 1523 static void 1524 each_dumpable_segment(struct thread *td, segment_callback func, void *closure) 1525 { 1526 struct proc *p = td->td_proc; 1527 vm_map_t map = &p->p_vmspace->vm_map; 1528 vm_map_entry_t entry; 1529 vm_object_t backing_object, object; 1530 boolean_t ignore_entry; 1531 1532 vm_map_lock_read(map); 1533 for (entry = map->header.next; entry != &map->header; 1534 entry = entry->next) { 1535 /* 1536 * Don't dump inaccessible mappings, deal with legacy 1537 * coredump mode. 1538 * 1539 * Note that read-only segments related to the elf binary 1540 * are marked MAP_ENTRY_NOCOREDUMP now so we no longer 1541 * need to arbitrarily ignore such segments. 1542 */ 1543 if (elf_legacy_coredump) { 1544 if ((entry->protection & VM_PROT_RW) != VM_PROT_RW) 1545 continue; 1546 } else { 1547 if ((entry->protection & VM_PROT_ALL) == 0) 1548 continue; 1549 } 1550 1551 /* 1552 * Dont include memory segment in the coredump if 1553 * MAP_NOCORE is set in mmap(2) or MADV_NOCORE in 1554 * madvise(2). Do not dump submaps (i.e. parts of the 1555 * kernel map). 1556 */ 1557 if (entry->eflags & (MAP_ENTRY_NOCOREDUMP|MAP_ENTRY_IS_SUB_MAP)) 1558 continue; 1559 1560 if ((object = entry->object.vm_object) == NULL) 1561 continue; 1562 1563 /* Ignore memory-mapped devices and such things. */ 1564 VM_OBJECT_RLOCK(object); 1565 while ((backing_object = object->backing_object) != NULL) { 1566 VM_OBJECT_RLOCK(backing_object); 1567 VM_OBJECT_RUNLOCK(object); 1568 object = backing_object; 1569 } 1570 ignore_entry = object->type != OBJT_DEFAULT && 1571 object->type != OBJT_SWAP && object->type != OBJT_VNODE && 1572 object->type != OBJT_PHYS; 1573 VM_OBJECT_RUNLOCK(object); 1574 if (ignore_entry) 1575 continue; 1576 1577 (*func)(entry, closure); 1578 } 1579 vm_map_unlock_read(map); 1580 } 1581 1582 /* 1583 * Write the core file header to the file, including padding up to 1584 * the page boundary. 1585 */ 1586 static int 1587 __elfN(corehdr)(struct coredump_params *p, int numsegs, void *hdr, 1588 size_t hdrsize, struct note_info_list *notelst, size_t notesz) 1589 { 1590 struct note_info *ninfo; 1591 struct sbuf *sb; 1592 int error; 1593 1594 /* Fill in the header. */ 1595 bzero(hdr, hdrsize); 1596 __elfN(puthdr)(p->td, hdr, hdrsize, numsegs, notesz); 1597 1598 sb = sbuf_new(NULL, NULL, CORE_BUF_SIZE, SBUF_FIXEDLEN); 1599 sbuf_set_drain(sb, sbuf_drain_core_output, p); 1600 sbuf_start_section(sb, NULL); 1601 sbuf_bcat(sb, hdr, hdrsize); 1602 TAILQ_FOREACH(ninfo, notelst, link) 1603 __elfN(putnote)(ninfo, sb); 1604 /* Align up to a page boundary for the program segments. */ 1605 sbuf_end_section(sb, -1, PAGE_SIZE, 0); 1606 error = sbuf_finish(sb); 1607 sbuf_delete(sb); 1608 1609 return (error); 1610 } 1611 1612 static void 1613 __elfN(prepare_notes)(struct thread *td, struct note_info_list *list, 1614 size_t *sizep) 1615 { 1616 struct proc *p; 1617 struct thread *thr; 1618 size_t size; 1619 1620 p = td->td_proc; 1621 size = 0; 1622 1623 size += register_note(list, NT_PRPSINFO, __elfN(note_prpsinfo), p); 1624 1625 /* 1626 * To have the debugger select the right thread (LWP) as the initial 1627 * thread, we dump the state of the thread passed to us in td first. 1628 * This is the thread that causes the core dump and thus likely to 1629 * be the right thread one wants to have selected in the debugger. 1630 */ 1631 thr = td; 1632 while (thr != NULL) { 1633 size += register_note(list, NT_PRSTATUS, 1634 __elfN(note_prstatus), thr); 1635 size += register_note(list, NT_FPREGSET, 1636 __elfN(note_fpregset), thr); 1637 size += register_note(list, NT_THRMISC, 1638 __elfN(note_thrmisc), thr); 1639 size += register_note(list, NT_PTLWPINFO, 1640 __elfN(note_ptlwpinfo), thr); 1641 size += register_note(list, -1, 1642 __elfN(note_threadmd), thr); 1643 1644 thr = (thr == td) ? TAILQ_FIRST(&p->p_threads) : 1645 TAILQ_NEXT(thr, td_plist); 1646 if (thr == td) 1647 thr = TAILQ_NEXT(thr, td_plist); 1648 } 1649 1650 size += register_note(list, NT_PROCSTAT_PROC, 1651 __elfN(note_procstat_proc), p); 1652 size += register_note(list, NT_PROCSTAT_FILES, 1653 note_procstat_files, p); 1654 size += register_note(list, NT_PROCSTAT_VMMAP, 1655 note_procstat_vmmap, p); 1656 size += register_note(list, NT_PROCSTAT_GROUPS, 1657 note_procstat_groups, p); 1658 size += register_note(list, NT_PROCSTAT_UMASK, 1659 note_procstat_umask, p); 1660 size += register_note(list, NT_PROCSTAT_RLIMIT, 1661 note_procstat_rlimit, p); 1662 size += register_note(list, NT_PROCSTAT_OSREL, 1663 note_procstat_osrel, p); 1664 size += register_note(list, NT_PROCSTAT_PSSTRINGS, 1665 __elfN(note_procstat_psstrings), p); 1666 size += register_note(list, NT_PROCSTAT_AUXV, 1667 __elfN(note_procstat_auxv), p); 1668 1669 *sizep = size; 1670 } 1671 1672 static void 1673 __elfN(puthdr)(struct thread *td, void *hdr, size_t hdrsize, int numsegs, 1674 size_t notesz) 1675 { 1676 Elf_Ehdr *ehdr; 1677 Elf_Phdr *phdr; 1678 Elf_Shdr *shdr; 1679 struct phdr_closure phc; 1680 1681 ehdr = (Elf_Ehdr *)hdr; 1682 1683 ehdr->e_ident[EI_MAG0] = ELFMAG0; 1684 ehdr->e_ident[EI_MAG1] = ELFMAG1; 1685 ehdr->e_ident[EI_MAG2] = ELFMAG2; 1686 ehdr->e_ident[EI_MAG3] = ELFMAG3; 1687 ehdr->e_ident[EI_CLASS] = ELF_CLASS; 1688 ehdr->e_ident[EI_DATA] = ELF_DATA; 1689 ehdr->e_ident[EI_VERSION] = EV_CURRENT; 1690 ehdr->e_ident[EI_OSABI] = ELFOSABI_FREEBSD; 1691 ehdr->e_ident[EI_ABIVERSION] = 0; 1692 ehdr->e_ident[EI_PAD] = 0; 1693 ehdr->e_type = ET_CORE; 1694 ehdr->e_machine = td->td_proc->p_elf_machine; 1695 ehdr->e_version = EV_CURRENT; 1696 ehdr->e_entry = 0; 1697 ehdr->e_phoff = sizeof(Elf_Ehdr); 1698 ehdr->e_flags = td->td_proc->p_elf_flags; 1699 ehdr->e_ehsize = sizeof(Elf_Ehdr); 1700 ehdr->e_phentsize = sizeof(Elf_Phdr); 1701 ehdr->e_shentsize = sizeof(Elf_Shdr); 1702 ehdr->e_shstrndx = SHN_UNDEF; 1703 if (numsegs + 1 < PN_XNUM) { 1704 ehdr->e_phnum = numsegs + 1; 1705 ehdr->e_shnum = 0; 1706 } else { 1707 ehdr->e_phnum = PN_XNUM; 1708 ehdr->e_shnum = 1; 1709 1710 ehdr->e_shoff = ehdr->e_phoff + 1711 (numsegs + 1) * ehdr->e_phentsize; 1712 KASSERT(ehdr->e_shoff == hdrsize - sizeof(Elf_Shdr), 1713 ("e_shoff: %zu, hdrsize - shdr: %zu", 1714 (size_t)ehdr->e_shoff, hdrsize - sizeof(Elf_Shdr))); 1715 1716 shdr = (Elf_Shdr *)((char *)hdr + ehdr->e_shoff); 1717 memset(shdr, 0, sizeof(*shdr)); 1718 /* 1719 * A special first section is used to hold large segment and 1720 * section counts. This was proposed by Sun Microsystems in 1721 * Solaris and has been adopted by Linux; the standard ELF 1722 * tools are already familiar with the technique. 1723 * 1724 * See table 7-7 of the Solaris "Linker and Libraries Guide" 1725 * (or 12-7 depending on the version of the document) for more 1726 * details. 1727 */ 1728 shdr->sh_type = SHT_NULL; 1729 shdr->sh_size = ehdr->e_shnum; 1730 shdr->sh_link = ehdr->e_shstrndx; 1731 shdr->sh_info = numsegs + 1; 1732 } 1733 1734 /* 1735 * Fill in the program header entries. 1736 */ 1737 phdr = (Elf_Phdr *)((char *)hdr + ehdr->e_phoff); 1738 1739 /* The note segement. */ 1740 phdr->p_type = PT_NOTE; 1741 phdr->p_offset = hdrsize; 1742 phdr->p_vaddr = 0; 1743 phdr->p_paddr = 0; 1744 phdr->p_filesz = notesz; 1745 phdr->p_memsz = 0; 1746 phdr->p_flags = PF_R; 1747 phdr->p_align = ELF_NOTE_ROUNDSIZE; 1748 phdr++; 1749 1750 /* All the writable segments from the program. */ 1751 phc.phdr = phdr; 1752 phc.offset = round_page(hdrsize + notesz); 1753 each_dumpable_segment(td, cb_put_phdr, &phc); 1754 } 1755 1756 static size_t 1757 register_note(struct note_info_list *list, int type, outfunc_t out, void *arg) 1758 { 1759 struct note_info *ninfo; 1760 size_t size, notesize; 1761 1762 size = 0; 1763 out(arg, NULL, &size); 1764 ninfo = malloc(sizeof(*ninfo), M_TEMP, M_ZERO | M_WAITOK); 1765 ninfo->type = type; 1766 ninfo->outfunc = out; 1767 ninfo->outarg = arg; 1768 ninfo->outsize = size; 1769 TAILQ_INSERT_TAIL(list, ninfo, link); 1770 1771 if (type == -1) 1772 return (size); 1773 1774 notesize = sizeof(Elf_Note) + /* note header */ 1775 roundup2(sizeof(FREEBSD_ABI_VENDOR), ELF_NOTE_ROUNDSIZE) + 1776 /* note name */ 1777 roundup2(size, ELF_NOTE_ROUNDSIZE); /* note description */ 1778 1779 return (notesize); 1780 } 1781 1782 static size_t 1783 append_note_data(const void *src, void *dst, size_t len) 1784 { 1785 size_t padded_len; 1786 1787 padded_len = roundup2(len, ELF_NOTE_ROUNDSIZE); 1788 if (dst != NULL) { 1789 bcopy(src, dst, len); 1790 bzero((char *)dst + len, padded_len - len); 1791 } 1792 return (padded_len); 1793 } 1794 1795 size_t 1796 __elfN(populate_note)(int type, void *src, void *dst, size_t size, void **descp) 1797 { 1798 Elf_Note *note; 1799 char *buf; 1800 size_t notesize; 1801 1802 buf = dst; 1803 if (buf != NULL) { 1804 note = (Elf_Note *)buf; 1805 note->n_namesz = sizeof(FREEBSD_ABI_VENDOR); 1806 note->n_descsz = size; 1807 note->n_type = type; 1808 buf += sizeof(*note); 1809 buf += append_note_data(FREEBSD_ABI_VENDOR, buf, 1810 sizeof(FREEBSD_ABI_VENDOR)); 1811 append_note_data(src, buf, size); 1812 if (descp != NULL) 1813 *descp = buf; 1814 } 1815 1816 notesize = sizeof(Elf_Note) + /* note header */ 1817 roundup2(sizeof(FREEBSD_ABI_VENDOR), ELF_NOTE_ROUNDSIZE) + 1818 /* note name */ 1819 roundup2(size, ELF_NOTE_ROUNDSIZE); /* note description */ 1820 1821 return (notesize); 1822 } 1823 1824 static void 1825 __elfN(putnote)(struct note_info *ninfo, struct sbuf *sb) 1826 { 1827 Elf_Note note; 1828 ssize_t old_len, sect_len; 1829 size_t new_len, descsz, i; 1830 1831 if (ninfo->type == -1) { 1832 ninfo->outfunc(ninfo->outarg, sb, &ninfo->outsize); 1833 return; 1834 } 1835 1836 note.n_namesz = sizeof(FREEBSD_ABI_VENDOR); 1837 note.n_descsz = ninfo->outsize; 1838 note.n_type = ninfo->type; 1839 1840 sbuf_bcat(sb, ¬e, sizeof(note)); 1841 sbuf_start_section(sb, &old_len); 1842 sbuf_bcat(sb, FREEBSD_ABI_VENDOR, sizeof(FREEBSD_ABI_VENDOR)); 1843 sbuf_end_section(sb, old_len, ELF_NOTE_ROUNDSIZE, 0); 1844 if (note.n_descsz == 0) 1845 return; 1846 sbuf_start_section(sb, &old_len); 1847 ninfo->outfunc(ninfo->outarg, sb, &ninfo->outsize); 1848 sect_len = sbuf_end_section(sb, old_len, ELF_NOTE_ROUNDSIZE, 0); 1849 if (sect_len < 0) 1850 return; 1851 1852 new_len = (size_t)sect_len; 1853 descsz = roundup(note.n_descsz, ELF_NOTE_ROUNDSIZE); 1854 if (new_len < descsz) { 1855 /* 1856 * It is expected that individual note emitters will correctly 1857 * predict their expected output size and fill up to that size 1858 * themselves, padding in a format-specific way if needed. 1859 * However, in case they don't, just do it here with zeros. 1860 */ 1861 for (i = 0; i < descsz - new_len; i++) 1862 sbuf_putc(sb, 0); 1863 } else if (new_len > descsz) { 1864 /* 1865 * We can't always truncate sb -- we may have drained some 1866 * of it already. 1867 */ 1868 KASSERT(new_len == descsz, ("%s: Note type %u changed as we " 1869 "read it (%zu > %zu). Since it is longer than " 1870 "expected, this coredump's notes are corrupt. THIS " 1871 "IS A BUG in the note_procstat routine for type %u.\n", 1872 __func__, (unsigned)note.n_type, new_len, descsz, 1873 (unsigned)note.n_type)); 1874 } 1875 } 1876 1877 /* 1878 * Miscellaneous note out functions. 1879 */ 1880 1881 #if defined(COMPAT_FREEBSD32) && __ELF_WORD_SIZE == 32 1882 #include <compat/freebsd32/freebsd32.h> 1883 #include <compat/freebsd32/freebsd32_signal.h> 1884 1885 typedef struct prstatus32 elf_prstatus_t; 1886 typedef struct prpsinfo32 elf_prpsinfo_t; 1887 typedef struct fpreg32 elf_prfpregset_t; 1888 typedef struct fpreg32 elf_fpregset_t; 1889 typedef struct reg32 elf_gregset_t; 1890 typedef struct thrmisc32 elf_thrmisc_t; 1891 #define ELF_KERN_PROC_MASK KERN_PROC_MASK32 1892 typedef struct kinfo_proc32 elf_kinfo_proc_t; 1893 typedef uint32_t elf_ps_strings_t; 1894 #else 1895 typedef prstatus_t elf_prstatus_t; 1896 typedef prpsinfo_t elf_prpsinfo_t; 1897 typedef prfpregset_t elf_prfpregset_t; 1898 typedef prfpregset_t elf_fpregset_t; 1899 typedef gregset_t elf_gregset_t; 1900 typedef thrmisc_t elf_thrmisc_t; 1901 #define ELF_KERN_PROC_MASK 0 1902 typedef struct kinfo_proc elf_kinfo_proc_t; 1903 typedef vm_offset_t elf_ps_strings_t; 1904 #endif 1905 1906 static void 1907 __elfN(note_prpsinfo)(void *arg, struct sbuf *sb, size_t *sizep) 1908 { 1909 struct sbuf sbarg; 1910 size_t len; 1911 char *cp, *end; 1912 struct proc *p; 1913 elf_prpsinfo_t *psinfo; 1914 int error; 1915 1916 p = (struct proc *)arg; 1917 if (sb != NULL) { 1918 KASSERT(*sizep == sizeof(*psinfo), ("invalid size")); 1919 psinfo = malloc(sizeof(*psinfo), M_TEMP, M_ZERO | M_WAITOK); 1920 psinfo->pr_version = PRPSINFO_VERSION; 1921 psinfo->pr_psinfosz = sizeof(elf_prpsinfo_t); 1922 strlcpy(psinfo->pr_fname, p->p_comm, sizeof(psinfo->pr_fname)); 1923 PROC_LOCK(p); 1924 if (p->p_args != NULL) { 1925 len = sizeof(psinfo->pr_psargs) - 1; 1926 if (len > p->p_args->ar_length) 1927 len = p->p_args->ar_length; 1928 memcpy(psinfo->pr_psargs, p->p_args->ar_args, len); 1929 PROC_UNLOCK(p); 1930 error = 0; 1931 } else { 1932 _PHOLD(p); 1933 PROC_UNLOCK(p); 1934 sbuf_new(&sbarg, psinfo->pr_psargs, 1935 sizeof(psinfo->pr_psargs), SBUF_FIXEDLEN); 1936 error = proc_getargv(curthread, p, &sbarg); 1937 PRELE(p); 1938 if (sbuf_finish(&sbarg) == 0) 1939 len = sbuf_len(&sbarg) - 1; 1940 else 1941 len = sizeof(psinfo->pr_psargs) - 1; 1942 sbuf_delete(&sbarg); 1943 } 1944 if (error || len == 0) 1945 strlcpy(psinfo->pr_psargs, p->p_comm, 1946 sizeof(psinfo->pr_psargs)); 1947 else { 1948 KASSERT(len < sizeof(psinfo->pr_psargs), 1949 ("len is too long: %zu vs %zu", len, 1950 sizeof(psinfo->pr_psargs))); 1951 cp = psinfo->pr_psargs; 1952 end = cp + len - 1; 1953 for (;;) { 1954 cp = memchr(cp, '\0', end - cp); 1955 if (cp == NULL) 1956 break; 1957 *cp = ' '; 1958 } 1959 } 1960 psinfo->pr_pid = p->p_pid; 1961 sbuf_bcat(sb, psinfo, sizeof(*psinfo)); 1962 free(psinfo, M_TEMP); 1963 } 1964 *sizep = sizeof(*psinfo); 1965 } 1966 1967 static void 1968 __elfN(note_prstatus)(void *arg, struct sbuf *sb, size_t *sizep) 1969 { 1970 struct thread *td; 1971 elf_prstatus_t *status; 1972 1973 td = (struct thread *)arg; 1974 if (sb != NULL) { 1975 KASSERT(*sizep == sizeof(*status), ("invalid size")); 1976 status = malloc(sizeof(*status), M_TEMP, M_ZERO | M_WAITOK); 1977 status->pr_version = PRSTATUS_VERSION; 1978 status->pr_statussz = sizeof(elf_prstatus_t); 1979 status->pr_gregsetsz = sizeof(elf_gregset_t); 1980 status->pr_fpregsetsz = sizeof(elf_fpregset_t); 1981 status->pr_osreldate = osreldate; 1982 status->pr_cursig = td->td_proc->p_sig; 1983 status->pr_pid = td->td_tid; 1984 #if defined(COMPAT_FREEBSD32) && __ELF_WORD_SIZE == 32 1985 fill_regs32(td, &status->pr_reg); 1986 #else 1987 fill_regs(td, &status->pr_reg); 1988 #endif 1989 sbuf_bcat(sb, status, sizeof(*status)); 1990 free(status, M_TEMP); 1991 } 1992 *sizep = sizeof(*status); 1993 } 1994 1995 static void 1996 __elfN(note_fpregset)(void *arg, struct sbuf *sb, size_t *sizep) 1997 { 1998 struct thread *td; 1999 elf_prfpregset_t *fpregset; 2000 2001 td = (struct thread *)arg; 2002 if (sb != NULL) { 2003 KASSERT(*sizep == sizeof(*fpregset), ("invalid size")); 2004 fpregset = malloc(sizeof(*fpregset), M_TEMP, M_ZERO | M_WAITOK); 2005 #if defined(COMPAT_FREEBSD32) && __ELF_WORD_SIZE == 32 2006 fill_fpregs32(td, fpregset); 2007 #else 2008 fill_fpregs(td, fpregset); 2009 #endif 2010 sbuf_bcat(sb, fpregset, sizeof(*fpregset)); 2011 free(fpregset, M_TEMP); 2012 } 2013 *sizep = sizeof(*fpregset); 2014 } 2015 2016 static void 2017 __elfN(note_thrmisc)(void *arg, struct sbuf *sb, size_t *sizep) 2018 { 2019 struct thread *td; 2020 elf_thrmisc_t thrmisc; 2021 2022 td = (struct thread *)arg; 2023 if (sb != NULL) { 2024 KASSERT(*sizep == sizeof(thrmisc), ("invalid size")); 2025 bzero(&thrmisc._pad, sizeof(thrmisc._pad)); 2026 strcpy(thrmisc.pr_tname, td->td_name); 2027 sbuf_bcat(sb, &thrmisc, sizeof(thrmisc)); 2028 } 2029 *sizep = sizeof(thrmisc); 2030 } 2031 2032 static void 2033 __elfN(note_ptlwpinfo)(void *arg, struct sbuf *sb, size_t *sizep) 2034 { 2035 struct thread *td; 2036 size_t size; 2037 int structsize; 2038 #if defined(COMPAT_FREEBSD32) && __ELF_WORD_SIZE == 32 2039 struct ptrace_lwpinfo32 pl; 2040 #else 2041 struct ptrace_lwpinfo pl; 2042 #endif 2043 2044 td = (struct thread *)arg; 2045 size = sizeof(structsize) + sizeof(pl); 2046 if (sb != NULL) { 2047 KASSERT(*sizep == size, ("invalid size")); 2048 structsize = sizeof(pl); 2049 sbuf_bcat(sb, &structsize, sizeof(structsize)); 2050 bzero(&pl, sizeof(pl)); 2051 pl.pl_lwpid = td->td_tid; 2052 pl.pl_event = PL_EVENT_NONE; 2053 pl.pl_sigmask = td->td_sigmask; 2054 pl.pl_siglist = td->td_siglist; 2055 if (td->td_si.si_signo != 0) { 2056 pl.pl_event = PL_EVENT_SIGNAL; 2057 pl.pl_flags |= PL_FLAG_SI; 2058 #if defined(COMPAT_FREEBSD32) && __ELF_WORD_SIZE == 32 2059 siginfo_to_siginfo32(&td->td_si, &pl.pl_siginfo); 2060 #else 2061 pl.pl_siginfo = td->td_si; 2062 #endif 2063 } 2064 strcpy(pl.pl_tdname, td->td_name); 2065 /* XXX TODO: supply more information in struct ptrace_lwpinfo*/ 2066 sbuf_bcat(sb, &pl, sizeof(pl)); 2067 } 2068 *sizep = size; 2069 } 2070 2071 /* 2072 * Allow for MD specific notes, as well as any MD 2073 * specific preparations for writing MI notes. 2074 */ 2075 static void 2076 __elfN(note_threadmd)(void *arg, struct sbuf *sb, size_t *sizep) 2077 { 2078 struct thread *td; 2079 void *buf; 2080 size_t size; 2081 2082 td = (struct thread *)arg; 2083 size = *sizep; 2084 if (size != 0 && sb != NULL) 2085 buf = malloc(size, M_TEMP, M_ZERO | M_WAITOK); 2086 else 2087 buf = NULL; 2088 size = 0; 2089 __elfN(dump_thread)(td, buf, &size); 2090 KASSERT(sb == NULL || *sizep == size, ("invalid size")); 2091 if (size != 0 && sb != NULL) 2092 sbuf_bcat(sb, buf, size); 2093 free(buf, M_TEMP); 2094 *sizep = size; 2095 } 2096 2097 #ifdef KINFO_PROC_SIZE 2098 CTASSERT(sizeof(struct kinfo_proc) == KINFO_PROC_SIZE); 2099 #endif 2100 2101 static void 2102 __elfN(note_procstat_proc)(void *arg, struct sbuf *sb, size_t *sizep) 2103 { 2104 struct proc *p; 2105 size_t size; 2106 int structsize; 2107 2108 p = (struct proc *)arg; 2109 size = sizeof(structsize) + p->p_numthreads * 2110 sizeof(elf_kinfo_proc_t); 2111 2112 if (sb != NULL) { 2113 KASSERT(*sizep == size, ("invalid size")); 2114 structsize = sizeof(elf_kinfo_proc_t); 2115 sbuf_bcat(sb, &structsize, sizeof(structsize)); 2116 sx_slock(&proctree_lock); 2117 PROC_LOCK(p); 2118 kern_proc_out(p, sb, ELF_KERN_PROC_MASK); 2119 sx_sunlock(&proctree_lock); 2120 } 2121 *sizep = size; 2122 } 2123 2124 #ifdef KINFO_FILE_SIZE 2125 CTASSERT(sizeof(struct kinfo_file) == KINFO_FILE_SIZE); 2126 #endif 2127 2128 static void 2129 note_procstat_files(void *arg, struct sbuf *sb, size_t *sizep) 2130 { 2131 struct proc *p; 2132 size_t size, sect_sz, i; 2133 ssize_t start_len, sect_len; 2134 int structsize, filedesc_flags; 2135 2136 if (coredump_pack_fileinfo) 2137 filedesc_flags = KERN_FILEDESC_PACK_KINFO; 2138 else 2139 filedesc_flags = 0; 2140 2141 p = (struct proc *)arg; 2142 structsize = sizeof(struct kinfo_file); 2143 if (sb == NULL) { 2144 size = 0; 2145 sb = sbuf_new(NULL, NULL, 128, SBUF_FIXEDLEN); 2146 sbuf_set_drain(sb, sbuf_drain_count, &size); 2147 sbuf_bcat(sb, &structsize, sizeof(structsize)); 2148 PROC_LOCK(p); 2149 kern_proc_filedesc_out(p, sb, -1, filedesc_flags); 2150 sbuf_finish(sb); 2151 sbuf_delete(sb); 2152 *sizep = size; 2153 } else { 2154 sbuf_start_section(sb, &start_len); 2155 2156 sbuf_bcat(sb, &structsize, sizeof(structsize)); 2157 PROC_LOCK(p); 2158 kern_proc_filedesc_out(p, sb, *sizep - sizeof(structsize), 2159 filedesc_flags); 2160 2161 sect_len = sbuf_end_section(sb, start_len, 0, 0); 2162 if (sect_len < 0) 2163 return; 2164 sect_sz = sect_len; 2165 2166 KASSERT(sect_sz <= *sizep, 2167 ("kern_proc_filedesc_out did not respect maxlen; " 2168 "requested %zu, got %zu", *sizep - sizeof(structsize), 2169 sect_sz - sizeof(structsize))); 2170 2171 for (i = 0; i < *sizep - sect_sz && sb->s_error == 0; i++) 2172 sbuf_putc(sb, 0); 2173 } 2174 } 2175 2176 #ifdef KINFO_VMENTRY_SIZE 2177 CTASSERT(sizeof(struct kinfo_vmentry) == KINFO_VMENTRY_SIZE); 2178 #endif 2179 2180 static void 2181 note_procstat_vmmap(void *arg, struct sbuf *sb, size_t *sizep) 2182 { 2183 struct proc *p; 2184 size_t size; 2185 int structsize, vmmap_flags; 2186 2187 if (coredump_pack_vmmapinfo) 2188 vmmap_flags = KERN_VMMAP_PACK_KINFO; 2189 else 2190 vmmap_flags = 0; 2191 2192 p = (struct proc *)arg; 2193 structsize = sizeof(struct kinfo_vmentry); 2194 if (sb == NULL) { 2195 size = 0; 2196 sb = sbuf_new(NULL, NULL, 128, SBUF_FIXEDLEN); 2197 sbuf_set_drain(sb, sbuf_drain_count, &size); 2198 sbuf_bcat(sb, &structsize, sizeof(structsize)); 2199 PROC_LOCK(p); 2200 kern_proc_vmmap_out(p, sb, -1, vmmap_flags); 2201 sbuf_finish(sb); 2202 sbuf_delete(sb); 2203 *sizep = size; 2204 } else { 2205 sbuf_bcat(sb, &structsize, sizeof(structsize)); 2206 PROC_LOCK(p); 2207 kern_proc_vmmap_out(p, sb, *sizep - sizeof(structsize), 2208 vmmap_flags); 2209 } 2210 } 2211 2212 static void 2213 note_procstat_groups(void *arg, struct sbuf *sb, size_t *sizep) 2214 { 2215 struct proc *p; 2216 size_t size; 2217 int structsize; 2218 2219 p = (struct proc *)arg; 2220 size = sizeof(structsize) + p->p_ucred->cr_ngroups * sizeof(gid_t); 2221 if (sb != NULL) { 2222 KASSERT(*sizep == size, ("invalid size")); 2223 structsize = sizeof(gid_t); 2224 sbuf_bcat(sb, &structsize, sizeof(structsize)); 2225 sbuf_bcat(sb, p->p_ucred->cr_groups, p->p_ucred->cr_ngroups * 2226 sizeof(gid_t)); 2227 } 2228 *sizep = size; 2229 } 2230 2231 static void 2232 note_procstat_umask(void *arg, struct sbuf *sb, size_t *sizep) 2233 { 2234 struct proc *p; 2235 size_t size; 2236 int structsize; 2237 2238 p = (struct proc *)arg; 2239 size = sizeof(structsize) + sizeof(p->p_fd->fd_cmask); 2240 if (sb != NULL) { 2241 KASSERT(*sizep == size, ("invalid size")); 2242 structsize = sizeof(p->p_fd->fd_cmask); 2243 sbuf_bcat(sb, &structsize, sizeof(structsize)); 2244 sbuf_bcat(sb, &p->p_fd->fd_cmask, sizeof(p->p_fd->fd_cmask)); 2245 } 2246 *sizep = size; 2247 } 2248 2249 static void 2250 note_procstat_rlimit(void *arg, struct sbuf *sb, size_t *sizep) 2251 { 2252 struct proc *p; 2253 struct rlimit rlim[RLIM_NLIMITS]; 2254 size_t size; 2255 int structsize, i; 2256 2257 p = (struct proc *)arg; 2258 size = sizeof(structsize) + sizeof(rlim); 2259 if (sb != NULL) { 2260 KASSERT(*sizep == size, ("invalid size")); 2261 structsize = sizeof(rlim); 2262 sbuf_bcat(sb, &structsize, sizeof(structsize)); 2263 PROC_LOCK(p); 2264 for (i = 0; i < RLIM_NLIMITS; i++) 2265 lim_rlimit_proc(p, i, &rlim[i]); 2266 PROC_UNLOCK(p); 2267 sbuf_bcat(sb, rlim, sizeof(rlim)); 2268 } 2269 *sizep = size; 2270 } 2271 2272 static void 2273 note_procstat_osrel(void *arg, struct sbuf *sb, size_t *sizep) 2274 { 2275 struct proc *p; 2276 size_t size; 2277 int structsize; 2278 2279 p = (struct proc *)arg; 2280 size = sizeof(structsize) + sizeof(p->p_osrel); 2281 if (sb != NULL) { 2282 KASSERT(*sizep == size, ("invalid size")); 2283 structsize = sizeof(p->p_osrel); 2284 sbuf_bcat(sb, &structsize, sizeof(structsize)); 2285 sbuf_bcat(sb, &p->p_osrel, sizeof(p->p_osrel)); 2286 } 2287 *sizep = size; 2288 } 2289 2290 static void 2291 __elfN(note_procstat_psstrings)(void *arg, struct sbuf *sb, size_t *sizep) 2292 { 2293 struct proc *p; 2294 elf_ps_strings_t ps_strings; 2295 size_t size; 2296 int structsize; 2297 2298 p = (struct proc *)arg; 2299 size = sizeof(structsize) + sizeof(ps_strings); 2300 if (sb != NULL) { 2301 KASSERT(*sizep == size, ("invalid size")); 2302 structsize = sizeof(ps_strings); 2303 #if defined(COMPAT_FREEBSD32) && __ELF_WORD_SIZE == 32 2304 ps_strings = PTROUT(p->p_sysent->sv_psstrings); 2305 #else 2306 ps_strings = p->p_sysent->sv_psstrings; 2307 #endif 2308 sbuf_bcat(sb, &structsize, sizeof(structsize)); 2309 sbuf_bcat(sb, &ps_strings, sizeof(ps_strings)); 2310 } 2311 *sizep = size; 2312 } 2313 2314 static void 2315 __elfN(note_procstat_auxv)(void *arg, struct sbuf *sb, size_t *sizep) 2316 { 2317 struct proc *p; 2318 size_t size; 2319 int structsize; 2320 2321 p = (struct proc *)arg; 2322 if (sb == NULL) { 2323 size = 0; 2324 sb = sbuf_new(NULL, NULL, 128, SBUF_FIXEDLEN); 2325 sbuf_set_drain(sb, sbuf_drain_count, &size); 2326 sbuf_bcat(sb, &structsize, sizeof(structsize)); 2327 PHOLD(p); 2328 proc_getauxv(curthread, p, sb); 2329 PRELE(p); 2330 sbuf_finish(sb); 2331 sbuf_delete(sb); 2332 *sizep = size; 2333 } else { 2334 structsize = sizeof(Elf_Auxinfo); 2335 sbuf_bcat(sb, &structsize, sizeof(structsize)); 2336 PHOLD(p); 2337 proc_getauxv(curthread, p, sb); 2338 PRELE(p); 2339 } 2340 } 2341 2342 static boolean_t 2343 __elfN(parse_notes)(struct image_params *imgp, Elf_Brandnote *checknote, 2344 int32_t *osrel, const Elf_Phdr *pnote) 2345 { 2346 const Elf_Note *note, *note0, *note_end; 2347 const char *note_name; 2348 char *buf; 2349 int i, error; 2350 boolean_t res; 2351 2352 /* We need some limit, might as well use PAGE_SIZE. */ 2353 if (pnote == NULL || pnote->p_filesz > PAGE_SIZE) 2354 return (FALSE); 2355 ASSERT_VOP_LOCKED(imgp->vp, "parse_notes"); 2356 if (pnote->p_offset > PAGE_SIZE || 2357 pnote->p_filesz > PAGE_SIZE - pnote->p_offset) { 2358 VOP_UNLOCK(imgp->vp, 0); 2359 buf = malloc(pnote->p_filesz, M_TEMP, M_WAITOK); 2360 vn_lock(imgp->vp, LK_EXCLUSIVE | LK_RETRY); 2361 error = vn_rdwr(UIO_READ, imgp->vp, buf, pnote->p_filesz, 2362 pnote->p_offset, UIO_SYSSPACE, IO_NODELOCKED, 2363 curthread->td_ucred, NOCRED, NULL, curthread); 2364 if (error != 0) { 2365 uprintf("i/o error PT_NOTE\n"); 2366 res = FALSE; 2367 goto ret; 2368 } 2369 note = note0 = (const Elf_Note *)buf; 2370 note_end = (const Elf_Note *)(buf + pnote->p_filesz); 2371 } else { 2372 note = note0 = (const Elf_Note *)(imgp->image_header + 2373 pnote->p_offset); 2374 note_end = (const Elf_Note *)(imgp->image_header + 2375 pnote->p_offset + pnote->p_filesz); 2376 buf = NULL; 2377 } 2378 for (i = 0; i < 100 && note >= note0 && note < note_end; i++) { 2379 if (!aligned(note, Elf32_Addr) || (const char *)note_end - 2380 (const char *)note < sizeof(Elf_Note)) { 2381 res = FALSE; 2382 goto ret; 2383 } 2384 if (note->n_namesz != checknote->hdr.n_namesz || 2385 note->n_descsz != checknote->hdr.n_descsz || 2386 note->n_type != checknote->hdr.n_type) 2387 goto nextnote; 2388 note_name = (const char *)(note + 1); 2389 if (note_name + checknote->hdr.n_namesz >= 2390 (const char *)note_end || strncmp(checknote->vendor, 2391 note_name, checknote->hdr.n_namesz) != 0) 2392 goto nextnote; 2393 2394 /* 2395 * Fetch the osreldate for binary 2396 * from the ELF OSABI-note if necessary. 2397 */ 2398 if ((checknote->flags & BN_TRANSLATE_OSREL) != 0 && 2399 checknote->trans_osrel != NULL) { 2400 res = checknote->trans_osrel(note, osrel); 2401 goto ret; 2402 } 2403 res = TRUE; 2404 goto ret; 2405 nextnote: 2406 note = (const Elf_Note *)((const char *)(note + 1) + 2407 roundup2(note->n_namesz, ELF_NOTE_ROUNDSIZE) + 2408 roundup2(note->n_descsz, ELF_NOTE_ROUNDSIZE)); 2409 } 2410 res = FALSE; 2411 ret: 2412 free(buf, M_TEMP); 2413 return (res); 2414 } 2415 2416 /* 2417 * Try to find the appropriate ABI-note section for checknote, 2418 * fetch the osreldate for binary from the ELF OSABI-note. Only the 2419 * first page of the image is searched, the same as for headers. 2420 */ 2421 static boolean_t 2422 __elfN(check_note)(struct image_params *imgp, Elf_Brandnote *checknote, 2423 int32_t *osrel) 2424 { 2425 const Elf_Phdr *phdr; 2426 const Elf_Ehdr *hdr; 2427 int i; 2428 2429 hdr = (const Elf_Ehdr *)imgp->image_header; 2430 phdr = (const Elf_Phdr *)(imgp->image_header + hdr->e_phoff); 2431 2432 for (i = 0; i < hdr->e_phnum; i++) { 2433 if (phdr[i].p_type == PT_NOTE && 2434 __elfN(parse_notes)(imgp, checknote, osrel, &phdr[i])) 2435 return (TRUE); 2436 } 2437 return (FALSE); 2438 2439 } 2440 2441 /* 2442 * Tell kern_execve.c about it, with a little help from the linker. 2443 */ 2444 static struct execsw __elfN(execsw) = { 2445 .ex_imgact = __CONCAT(exec_, __elfN(imgact)), 2446 .ex_name = __XSTRING(__CONCAT(ELF, __ELF_WORD_SIZE)) 2447 }; 2448 EXEC_SET(__CONCAT(elf, __ELF_WORD_SIZE), __elfN(execsw)); 2449 2450 static vm_prot_t 2451 __elfN(trans_prot)(Elf_Word flags) 2452 { 2453 vm_prot_t prot; 2454 2455 prot = 0; 2456 if (flags & PF_X) 2457 prot |= VM_PROT_EXECUTE; 2458 if (flags & PF_W) 2459 prot |= VM_PROT_WRITE; 2460 if (flags & PF_R) 2461 prot |= VM_PROT_READ; 2462 #if __ELF_WORD_SIZE == 32 2463 #if defined(__amd64__) 2464 if (i386_read_exec && (flags & PF_R)) 2465 prot |= VM_PROT_EXECUTE; 2466 #endif 2467 #endif 2468 return (prot); 2469 } 2470 2471 static Elf_Word 2472 __elfN(untrans_prot)(vm_prot_t prot) 2473 { 2474 Elf_Word flags; 2475 2476 flags = 0; 2477 if (prot & VM_PROT_EXECUTE) 2478 flags |= PF_X; 2479 if (prot & VM_PROT_READ) 2480 flags |= PF_R; 2481 if (prot & VM_PROT_WRITE) 2482 flags |= PF_W; 2483 return (flags); 2484 }
Cache object: ee0cfa1c9e964f2af40b8a134e44c55f
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