1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 3 * 4 * Copyright (c) 1998-2000 Doug Rabson 5 * Copyright (c) 2004 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 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 */ 29 30 #include "opt_ddb.h" 31 32 #include <sys/param.h> 33 #include <sys/systm.h> 34 #include <sys/fcntl.h> 35 #include <sys/kernel.h> 36 #include <sys/lock.h> 37 #include <sys/malloc.h> 38 #include <sys/linker.h> 39 #include <sys/mutex.h> 40 #include <sys/mount.h> 41 #include <sys/namei.h> 42 #include <sys/proc.h> 43 #include <sys/rwlock.h> 44 #include <sys/sysctl.h> 45 #include <sys/vnode.h> 46 47 #include <machine/elf.h> 48 49 #include <net/vnet.h> 50 51 #include <security/mac/mac_framework.h> 52 53 #include <vm/vm.h> 54 #include <vm/vm_param.h> 55 #include <vm/pmap.h> 56 #include <vm/vm_extern.h> 57 #include <vm/vm_kern.h> 58 #include <vm/vm_map.h> 59 #include <vm/vm_object.h> 60 #include <vm/vm_page.h> 61 #include <vm/vm_pager.h> 62 63 #include <sys/link_elf.h> 64 65 #ifdef DDB_CTF 66 #include <contrib/zlib/zlib.h> 67 #endif 68 69 #include "linker_if.h" 70 71 typedef struct { 72 void *addr; 73 void *origaddr; /* Used by debuggers. */ 74 Elf_Off size; 75 int flags; /* Section flags. */ 76 int sec; /* Original section number. */ 77 char *name; 78 } Elf_progent; 79 80 typedef struct { 81 Elf_Rel *rel; 82 int nrel; 83 int sec; 84 } Elf_relent; 85 86 typedef struct { 87 Elf_Rela *rela; 88 int nrela; 89 int sec; 90 } Elf_relaent; 91 92 typedef struct elf_file { 93 struct linker_file lf; /* Common fields */ 94 95 int preloaded; 96 caddr_t address; /* Relocation address */ 97 vm_object_t object; /* VM object to hold file pages */ 98 Elf_Shdr *e_shdr; 99 100 Elf_progent *progtab; 101 u_int nprogtab; 102 103 Elf_relaent *relatab; 104 u_int nrelatab; 105 106 Elf_relent *reltab; 107 int nreltab; 108 109 Elf_Sym *ddbsymtab; /* The symbol table we are using */ 110 long ddbsymcnt; /* Number of symbols */ 111 caddr_t ddbstrtab; /* String table */ 112 long ddbstrcnt; /* number of bytes in string table */ 113 114 caddr_t shstrtab; /* Section name string table */ 115 long shstrcnt; /* number of bytes in string table */ 116 117 caddr_t ctftab; /* CTF table */ 118 long ctfcnt; /* number of bytes in CTF table */ 119 caddr_t ctfoff; /* CTF offset table */ 120 caddr_t typoff; /* Type offset table */ 121 long typlen; /* Number of type entries. */ 122 123 } *elf_file_t; 124 125 #include <kern/kern_ctf.c> 126 127 static int link_elf_link_preload(linker_class_t cls, 128 const char *, linker_file_t *); 129 static int link_elf_link_preload_finish(linker_file_t); 130 static int link_elf_load_file(linker_class_t, const char *, linker_file_t *); 131 static int link_elf_lookup_symbol(linker_file_t, const char *, 132 c_linker_sym_t *); 133 static int link_elf_lookup_debug_symbol(linker_file_t, const char *, 134 c_linker_sym_t *); 135 static int link_elf_lookup_debug_symbol_ctf(linker_file_t lf, 136 const char *name, c_linker_sym_t *sym, linker_ctf_t *lc); 137 static int link_elf_symbol_values(linker_file_t, c_linker_sym_t, 138 linker_symval_t *); 139 static int link_elf_debug_symbol_values(linker_file_t, c_linker_sym_t, 140 linker_symval_t *); 141 static int link_elf_search_symbol(linker_file_t, caddr_t value, 142 c_linker_sym_t *sym, long *diffp); 143 144 static void link_elf_unload_file(linker_file_t); 145 static int link_elf_lookup_set(linker_file_t, const char *, 146 void ***, void ***, int *); 147 static int link_elf_each_function_name(linker_file_t, 148 int (*)(const char *, void *), void *); 149 static int link_elf_each_function_nameval(linker_file_t, 150 linker_function_nameval_callback_t, 151 void *); 152 static int link_elf_reloc_local(linker_file_t, bool); 153 static long link_elf_symtab_get(linker_file_t, const Elf_Sym **); 154 static long link_elf_strtab_get(linker_file_t, caddr_t *); 155 #ifdef VIMAGE 156 static void link_elf_propagate_vnets(linker_file_t); 157 #endif 158 159 static int elf_obj_lookup(linker_file_t lf, Elf_Size symidx, int deps, 160 Elf_Addr *); 161 162 static kobj_method_t link_elf_methods[] = { 163 KOBJMETHOD(linker_lookup_symbol, link_elf_lookup_symbol), 164 KOBJMETHOD(linker_lookup_debug_symbol, link_elf_lookup_debug_symbol), 165 KOBJMETHOD(linker_lookup_debug_symbol_ctf, link_elf_lookup_debug_symbol_ctf), 166 KOBJMETHOD(linker_symbol_values, link_elf_symbol_values), 167 KOBJMETHOD(linker_debug_symbol_values, link_elf_debug_symbol_values), 168 KOBJMETHOD(linker_search_symbol, link_elf_search_symbol), 169 KOBJMETHOD(linker_unload, link_elf_unload_file), 170 KOBJMETHOD(linker_load_file, link_elf_load_file), 171 KOBJMETHOD(linker_link_preload, link_elf_link_preload), 172 KOBJMETHOD(linker_link_preload_finish, link_elf_link_preload_finish), 173 KOBJMETHOD(linker_lookup_set, link_elf_lookup_set), 174 KOBJMETHOD(linker_each_function_name, link_elf_each_function_name), 175 KOBJMETHOD(linker_each_function_nameval, link_elf_each_function_nameval), 176 KOBJMETHOD(linker_ctf_get, link_elf_ctf_get), 177 KOBJMETHOD(linker_ctf_lookup_typename, link_elf_ctf_lookup_typename), 178 KOBJMETHOD(linker_symtab_get, link_elf_symtab_get), 179 KOBJMETHOD(linker_strtab_get, link_elf_strtab_get), 180 #ifdef VIMAGE 181 KOBJMETHOD(linker_propagate_vnets, link_elf_propagate_vnets), 182 #endif 183 KOBJMETHOD_END 184 }; 185 186 static struct linker_class link_elf_class = { 187 #if ELF_TARG_CLASS == ELFCLASS32 188 "elf32_obj", 189 #else 190 "elf64_obj", 191 #endif 192 link_elf_methods, sizeof(struct elf_file) 193 }; 194 195 static bool link_elf_obj_leak_locals = true; 196 SYSCTL_BOOL(_debug, OID_AUTO, link_elf_obj_leak_locals, 197 CTLFLAG_RWTUN, &link_elf_obj_leak_locals, 0, 198 "Allow local symbols to participate in global module symbol resolution"); 199 200 static int relocate_file(elf_file_t ef); 201 static void elf_obj_cleanup_globals_cache(elf_file_t); 202 203 static void 204 link_elf_error(const char *filename, const char *s) 205 { 206 if (filename == NULL) 207 printf("kldload: %s\n", s); 208 else 209 printf("kldload: %s: %s\n", filename, s); 210 } 211 212 static void 213 link_elf_init(void *arg) 214 { 215 216 linker_add_class(&link_elf_class); 217 } 218 SYSINIT(link_elf_obj, SI_SUB_KLD, SI_ORDER_SECOND, link_elf_init, NULL); 219 220 static void 221 link_elf_protect_range(elf_file_t ef, vm_offset_t start, vm_offset_t end, 222 vm_prot_t prot) 223 { 224 int error __unused; 225 226 KASSERT(start <= end && start >= (vm_offset_t)ef->address && 227 end <= round_page((vm_offset_t)ef->address + ef->lf.size), 228 ("link_elf_protect_range: invalid range %#jx-%#jx", 229 (uintmax_t)start, (uintmax_t)end)); 230 231 if (start == end) 232 return; 233 if (ef->preloaded) { 234 #ifdef __amd64__ 235 error = pmap_change_prot(start, end - start, prot); 236 KASSERT(error == 0, 237 ("link_elf_protect_range: pmap_change_prot() returned %d", 238 error)); 239 #endif 240 return; 241 } 242 error = vm_map_protect(kernel_map, start, end, prot, 0, 243 VM_MAP_PROTECT_SET_PROT); 244 KASSERT(error == KERN_SUCCESS, 245 ("link_elf_protect_range: vm_map_protect() returned %d", error)); 246 } 247 248 /* 249 * Restrict permissions on linker file memory based on section flags. 250 * Sections need not be page-aligned, so overlap within a page is possible. 251 */ 252 static void 253 link_elf_protect(elf_file_t ef) 254 { 255 vm_offset_t end, segend, segstart, start; 256 vm_prot_t gapprot, prot, segprot; 257 int i; 258 259 /* 260 * If the file was preloaded, the last page may contain other preloaded 261 * data which may need to be writeable. ELF files are always 262 * page-aligned, but other preloaded data, such as entropy or CPU 263 * microcode may be loaded with a smaller alignment. 264 */ 265 gapprot = ef->preloaded ? VM_PROT_RW : VM_PROT_READ; 266 267 start = end = (vm_offset_t)ef->address; 268 prot = VM_PROT_READ; 269 for (i = 0; i < ef->nprogtab; i++) { 270 /* 271 * VNET and DPCPU sections have their memory allocated by their 272 * respective subsystems. 273 */ 274 if (ef->progtab[i].name != NULL && ( 275 #ifdef VIMAGE 276 strcmp(ef->progtab[i].name, VNET_SETNAME) == 0 || 277 #endif 278 strcmp(ef->progtab[i].name, DPCPU_SETNAME) == 0)) 279 continue; 280 281 segstart = trunc_page((vm_offset_t)ef->progtab[i].addr); 282 segend = round_page((vm_offset_t)ef->progtab[i].addr + 283 ef->progtab[i].size); 284 segprot = VM_PROT_READ; 285 if ((ef->progtab[i].flags & SHF_WRITE) != 0) 286 segprot |= VM_PROT_WRITE; 287 if ((ef->progtab[i].flags & SHF_EXECINSTR) != 0) 288 segprot |= VM_PROT_EXECUTE; 289 290 if (end <= segstart) { 291 /* 292 * Case 1: there is no overlap between the previous 293 * segment and this one. Apply protections to the 294 * previous segment, and protect the gap between the 295 * previous and current segments, if any. 296 */ 297 link_elf_protect_range(ef, start, end, prot); 298 link_elf_protect_range(ef, end, segstart, gapprot); 299 300 start = segstart; 301 end = segend; 302 prot = segprot; 303 } else if (start < segstart && end == segend) { 304 /* 305 * Case 2: the current segment is a subrange of the 306 * previous segment. Apply protections to the 307 * non-overlapping portion of the previous segment. 308 */ 309 link_elf_protect_range(ef, start, segstart, prot); 310 311 start = segstart; 312 prot |= segprot; 313 } else if (end < segend) { 314 /* 315 * Case 3: there is partial overlap between the previous 316 * and current segments. Apply protections to the 317 * non-overlapping portion of the previous segment, and 318 * then the overlap, which must use the union of the two 319 * segments' protections. 320 */ 321 link_elf_protect_range(ef, start, segstart, prot); 322 link_elf_protect_range(ef, segstart, end, 323 prot | segprot); 324 start = end; 325 end = segend; 326 prot = segprot; 327 } else { 328 /* 329 * Case 4: the two segments reside in the same page. 330 */ 331 prot |= segprot; 332 } 333 } 334 335 /* 336 * Fix up the last unprotected segment and trailing data. 337 */ 338 link_elf_protect_range(ef, start, end, prot); 339 link_elf_protect_range(ef, end, 340 round_page((vm_offset_t)ef->address + ef->lf.size), gapprot); 341 } 342 343 static int 344 link_elf_link_preload(linker_class_t cls, const char *filename, 345 linker_file_t *result) 346 { 347 Elf_Ehdr *hdr; 348 Elf_Shdr *shdr; 349 Elf_Sym *es; 350 void *modptr, *baseptr, *sizeptr; 351 char *type; 352 elf_file_t ef; 353 linker_file_t lf; 354 Elf_Addr off; 355 int error, i, j, pb, ra, rl, shstrindex, symstrindex, symtabindex; 356 357 /* Look to see if we have the file preloaded */ 358 modptr = preload_search_by_name(filename); 359 if (modptr == NULL) 360 return ENOENT; 361 362 type = (char *)preload_search_info(modptr, MODINFO_TYPE); 363 baseptr = preload_search_info(modptr, MODINFO_ADDR); 364 sizeptr = preload_search_info(modptr, MODINFO_SIZE); 365 hdr = (Elf_Ehdr *)preload_search_info(modptr, MODINFO_METADATA | 366 MODINFOMD_ELFHDR); 367 shdr = (Elf_Shdr *)preload_search_info(modptr, MODINFO_METADATA | 368 MODINFOMD_SHDR); 369 if (type == NULL || strcmp(type, preload_modtype_obj) != 0) 370 return (EFTYPE); 371 if (baseptr == NULL || sizeptr == NULL || hdr == NULL || 372 shdr == NULL) 373 return (EINVAL); 374 375 lf = linker_make_file(filename, &link_elf_class); 376 if (lf == NULL) 377 return (ENOMEM); 378 379 ef = (elf_file_t)lf; 380 ef->preloaded = 1; 381 ef->address = *(caddr_t *)baseptr; 382 lf->address = *(caddr_t *)baseptr; 383 lf->size = *(size_t *)sizeptr; 384 385 if (hdr->e_ident[EI_CLASS] != ELF_TARG_CLASS || 386 hdr->e_ident[EI_DATA] != ELF_TARG_DATA || 387 hdr->e_ident[EI_VERSION] != EV_CURRENT || 388 hdr->e_version != EV_CURRENT || 389 hdr->e_type != ET_REL || 390 hdr->e_machine != ELF_TARG_MACH) { 391 error = EFTYPE; 392 goto out; 393 } 394 ef->e_shdr = shdr; 395 396 /* Scan the section header for information and table sizing. */ 397 symtabindex = -1; 398 symstrindex = -1; 399 for (i = 0; i < hdr->e_shnum; i++) { 400 switch (shdr[i].sh_type) { 401 case SHT_PROGBITS: 402 case SHT_NOBITS: 403 #ifdef __amd64__ 404 case SHT_X86_64_UNWIND: 405 #endif 406 case SHT_INIT_ARRAY: 407 case SHT_FINI_ARRAY: 408 /* Ignore sections not loaded by the loader. */ 409 if (shdr[i].sh_addr == 0) 410 break; 411 ef->nprogtab++; 412 break; 413 case SHT_SYMTAB: 414 symtabindex = i; 415 symstrindex = shdr[i].sh_link; 416 break; 417 case SHT_REL: 418 /* 419 * Ignore relocation tables for sections not 420 * loaded by the loader. 421 */ 422 if (shdr[shdr[i].sh_info].sh_addr == 0) 423 break; 424 ef->nreltab++; 425 break; 426 case SHT_RELA: 427 if (shdr[shdr[i].sh_info].sh_addr == 0) 428 break; 429 ef->nrelatab++; 430 break; 431 } 432 } 433 434 shstrindex = hdr->e_shstrndx; 435 if (ef->nprogtab == 0 || symstrindex < 0 || 436 symstrindex >= hdr->e_shnum || 437 shdr[symstrindex].sh_type != SHT_STRTAB || shstrindex == 0 || 438 shstrindex >= hdr->e_shnum || 439 shdr[shstrindex].sh_type != SHT_STRTAB) { 440 printf("%s: bad/missing section headers\n", filename); 441 error = ENOEXEC; 442 goto out; 443 } 444 445 /* Allocate space for tracking the load chunks */ 446 if (ef->nprogtab != 0) 447 ef->progtab = malloc(ef->nprogtab * sizeof(*ef->progtab), 448 M_LINKER, M_WAITOK | M_ZERO); 449 if (ef->nreltab != 0) 450 ef->reltab = malloc(ef->nreltab * sizeof(*ef->reltab), 451 M_LINKER, M_WAITOK | M_ZERO); 452 if (ef->nrelatab != 0) 453 ef->relatab = malloc(ef->nrelatab * sizeof(*ef->relatab), 454 M_LINKER, M_WAITOK | M_ZERO); 455 if ((ef->nprogtab != 0 && ef->progtab == NULL) || 456 (ef->nreltab != 0 && ef->reltab == NULL) || 457 (ef->nrelatab != 0 && ef->relatab == NULL)) { 458 error = ENOMEM; 459 goto out; 460 } 461 462 /* XXX, relocate the sh_addr fields saved by the loader. */ 463 off = 0; 464 for (i = 0; i < hdr->e_shnum; i++) { 465 if (shdr[i].sh_addr != 0 && (off == 0 || shdr[i].sh_addr < off)) 466 off = shdr[i].sh_addr; 467 } 468 for (i = 0; i < hdr->e_shnum; i++) { 469 if (shdr[i].sh_addr != 0) 470 shdr[i].sh_addr = shdr[i].sh_addr - off + 471 (Elf_Addr)ef->address; 472 } 473 474 ef->ddbsymcnt = shdr[symtabindex].sh_size / sizeof(Elf_Sym); 475 ef->ddbsymtab = (Elf_Sym *)shdr[symtabindex].sh_addr; 476 ef->ddbstrcnt = shdr[symstrindex].sh_size; 477 ef->ddbstrtab = (char *)shdr[symstrindex].sh_addr; 478 ef->shstrcnt = shdr[shstrindex].sh_size; 479 ef->shstrtab = (char *)shdr[shstrindex].sh_addr; 480 481 /* Now fill out progtab and the relocation tables. */ 482 pb = 0; 483 rl = 0; 484 ra = 0; 485 for (i = 0; i < hdr->e_shnum; i++) { 486 switch (shdr[i].sh_type) { 487 case SHT_PROGBITS: 488 case SHT_NOBITS: 489 #ifdef __amd64__ 490 case SHT_X86_64_UNWIND: 491 #endif 492 case SHT_INIT_ARRAY: 493 case SHT_FINI_ARRAY: 494 if (shdr[i].sh_addr == 0) 495 break; 496 ef->progtab[pb].addr = ef->progtab[pb].origaddr = 497 (void *)shdr[i].sh_addr; 498 if (shdr[i].sh_type == SHT_PROGBITS) 499 ef->progtab[pb].name = "<<PROGBITS>>"; 500 #ifdef __amd64__ 501 else if (shdr[i].sh_type == SHT_X86_64_UNWIND) 502 ef->progtab[pb].name = "<<UNWIND>>"; 503 #endif 504 else if (shdr[i].sh_type == SHT_INIT_ARRAY) 505 ef->progtab[pb].name = "<<INIT_ARRAY>>"; 506 else if (shdr[i].sh_type == SHT_FINI_ARRAY) 507 ef->progtab[pb].name = "<<FINI_ARRAY>>"; 508 else 509 ef->progtab[pb].name = "<<NOBITS>>"; 510 ef->progtab[pb].size = shdr[i].sh_size; 511 ef->progtab[pb].flags = shdr[i].sh_flags; 512 ef->progtab[pb].sec = i; 513 if (ef->shstrtab && shdr[i].sh_name != 0) 514 ef->progtab[pb].name = 515 ef->shstrtab + shdr[i].sh_name; 516 if (ef->progtab[pb].name != NULL && 517 !strcmp(ef->progtab[pb].name, DPCPU_SETNAME)) { 518 void *dpcpu; 519 520 dpcpu = dpcpu_alloc(shdr[i].sh_size); 521 if (dpcpu == NULL) { 522 printf("%s: pcpu module space is out " 523 "of space; cannot allocate %#jx " 524 "for %s\n", __func__, 525 (uintmax_t)shdr[i].sh_size, 526 filename); 527 error = ENOSPC; 528 goto out; 529 } 530 memcpy(dpcpu, ef->progtab[pb].addr, 531 ef->progtab[pb].size); 532 dpcpu_copy(dpcpu, shdr[i].sh_size); 533 ef->progtab[pb].addr = dpcpu; 534 #ifdef VIMAGE 535 } else if (ef->progtab[pb].name != NULL && 536 !strcmp(ef->progtab[pb].name, VNET_SETNAME)) { 537 void *vnet_data; 538 539 vnet_data = vnet_data_alloc(shdr[i].sh_size); 540 if (vnet_data == NULL) { 541 printf("%s: vnet module space is out " 542 "of space; cannot allocate %#jx " 543 "for %s\n", __func__, 544 (uintmax_t)shdr[i].sh_size, 545 filename); 546 error = ENOSPC; 547 goto out; 548 } 549 memcpy(vnet_data, ef->progtab[pb].addr, 550 ef->progtab[pb].size); 551 ef->progtab[pb].addr = vnet_data; 552 vnet_save_init(ef->progtab[pb].addr, 553 ef->progtab[pb].size); 554 #endif 555 } else if ((ef->progtab[pb].name != NULL && 556 strcmp(ef->progtab[pb].name, ".ctors") == 0) || 557 shdr[i].sh_type == SHT_INIT_ARRAY) { 558 if (lf->ctors_addr != 0) { 559 printf( 560 "%s: multiple ctor sections in %s\n", 561 __func__, filename); 562 } else { 563 lf->ctors_addr = ef->progtab[pb].addr; 564 lf->ctors_size = shdr[i].sh_size; 565 } 566 } else if ((ef->progtab[pb].name != NULL && 567 strcmp(ef->progtab[pb].name, ".dtors") == 0) || 568 shdr[i].sh_type == SHT_FINI_ARRAY) { 569 if (lf->dtors_addr != 0) { 570 printf( 571 "%s: multiple dtor sections in %s\n", 572 __func__, filename); 573 } else { 574 lf->dtors_addr = ef->progtab[pb].addr; 575 lf->dtors_size = shdr[i].sh_size; 576 } 577 } 578 579 /* Update all symbol values with the offset. */ 580 for (j = 0; j < ef->ddbsymcnt; j++) { 581 es = &ef->ddbsymtab[j]; 582 if (es->st_shndx != i) 583 continue; 584 es->st_value += (Elf_Addr)ef->progtab[pb].addr; 585 } 586 pb++; 587 break; 588 case SHT_REL: 589 if (shdr[shdr[i].sh_info].sh_addr == 0) 590 break; 591 ef->reltab[rl].rel = (Elf_Rel *)shdr[i].sh_addr; 592 ef->reltab[rl].nrel = shdr[i].sh_size / sizeof(Elf_Rel); 593 ef->reltab[rl].sec = shdr[i].sh_info; 594 rl++; 595 break; 596 case SHT_RELA: 597 if (shdr[shdr[i].sh_info].sh_addr == 0) 598 break; 599 ef->relatab[ra].rela = (Elf_Rela *)shdr[i].sh_addr; 600 ef->relatab[ra].nrela = 601 shdr[i].sh_size / sizeof(Elf_Rela); 602 ef->relatab[ra].sec = shdr[i].sh_info; 603 ra++; 604 break; 605 } 606 } 607 if (pb != ef->nprogtab) { 608 printf("%s: lost progbits\n", filename); 609 error = ENOEXEC; 610 goto out; 611 } 612 if (rl != ef->nreltab) { 613 printf("%s: lost reltab\n", filename); 614 error = ENOEXEC; 615 goto out; 616 } 617 if (ra != ef->nrelatab) { 618 printf("%s: lost relatab\n", filename); 619 error = ENOEXEC; 620 goto out; 621 } 622 623 /* 624 * The file needs to be writeable and executable while applying 625 * relocations. Mapping protections are applied once relocation 626 * processing is complete. 627 */ 628 link_elf_protect_range(ef, (vm_offset_t)ef->address, 629 round_page((vm_offset_t)ef->address + ef->lf.size), VM_PROT_ALL); 630 631 /* Local intra-module relocations */ 632 error = link_elf_reloc_local(lf, false); 633 if (error != 0) 634 goto out; 635 *result = lf; 636 return (0); 637 638 out: 639 /* preload not done this way */ 640 linker_file_unload(lf, LINKER_UNLOAD_FORCE); 641 return (error); 642 } 643 644 static void 645 link_elf_invoke_cbs(caddr_t addr, size_t size) 646 { 647 void (**ctor)(void); 648 size_t i, cnt; 649 650 if (addr == NULL || size == 0) 651 return; 652 cnt = size / sizeof(*ctor); 653 ctor = (void *)addr; 654 for (i = 0; i < cnt; i++) { 655 if (ctor[i] != NULL) 656 (*ctor[i])(); 657 } 658 } 659 660 static void 661 link_elf_invoke_ctors(linker_file_t lf) 662 { 663 KASSERT(lf->ctors_invoked == LF_NONE, 664 ("%s: file %s ctor state %d", 665 __func__, lf->filename, lf->ctors_invoked)); 666 667 link_elf_invoke_cbs(lf->ctors_addr, lf->ctors_size); 668 lf->ctors_invoked = LF_CTORS; 669 } 670 671 static void 672 link_elf_invoke_dtors(linker_file_t lf) 673 { 674 KASSERT(lf->ctors_invoked != LF_DTORS, 675 ("%s: file %s ctor state %d", 676 __func__, lf->filename, lf->ctors_invoked)); 677 678 if (lf->ctors_invoked == LF_CTORS) { 679 link_elf_invoke_cbs(lf->dtors_addr, lf->dtors_size); 680 lf->ctors_invoked = LF_DTORS; 681 } 682 } 683 684 static int 685 link_elf_link_preload_finish(linker_file_t lf) 686 { 687 elf_file_t ef; 688 int error; 689 690 ef = (elf_file_t)lf; 691 error = relocate_file(ef); 692 if (error) 693 return (error); 694 695 /* Notify MD code that a module is being loaded. */ 696 error = elf_cpu_load_file(lf); 697 if (error) 698 return (error); 699 700 #if defined(__i386__) || defined(__amd64__) 701 /* Now ifuncs. */ 702 error = link_elf_reloc_local(lf, true); 703 if (error != 0) 704 return (error); 705 #endif 706 707 /* Apply protections now that relocation processing is complete. */ 708 link_elf_protect(ef); 709 710 link_elf_invoke_ctors(lf); 711 return (0); 712 } 713 714 static int 715 link_elf_load_file(linker_class_t cls, const char *filename, 716 linker_file_t *result) 717 { 718 struct nameidata *nd; 719 struct thread *td = curthread; /* XXX */ 720 Elf_Ehdr *hdr; 721 Elf_Shdr *shdr; 722 Elf_Sym *es; 723 int nbytes, i, j; 724 vm_offset_t mapbase; 725 size_t mapsize; 726 int error = 0; 727 ssize_t resid; 728 int flags; 729 elf_file_t ef; 730 linker_file_t lf; 731 int symtabindex; 732 int symstrindex; 733 int shstrindex; 734 int nsym; 735 int pb, rl, ra; 736 int alignmask; 737 738 shdr = NULL; 739 lf = NULL; 740 mapsize = 0; 741 hdr = NULL; 742 743 nd = malloc(sizeof(struct nameidata), M_TEMP, M_WAITOK); 744 NDINIT(nd, LOOKUP, FOLLOW, UIO_SYSSPACE, filename); 745 flags = FREAD; 746 error = vn_open(nd, &flags, 0, NULL); 747 if (error) { 748 free(nd, M_TEMP); 749 return error; 750 } 751 NDFREE_PNBUF(nd); 752 if (nd->ni_vp->v_type != VREG) { 753 error = ENOEXEC; 754 goto out; 755 } 756 #ifdef MAC 757 error = mac_kld_check_load(td->td_ucred, nd->ni_vp); 758 if (error) { 759 goto out; 760 } 761 #endif 762 763 /* Read the elf header from the file. */ 764 hdr = malloc(sizeof(*hdr), M_LINKER, M_WAITOK); 765 error = vn_rdwr(UIO_READ, nd->ni_vp, (void *)hdr, sizeof(*hdr), 0, 766 UIO_SYSSPACE, IO_NODELOCKED, td->td_ucred, NOCRED, 767 &resid, td); 768 if (error) 769 goto out; 770 if (resid != 0){ 771 error = ENOEXEC; 772 goto out; 773 } 774 775 if (!IS_ELF(*hdr)) { 776 error = ENOEXEC; 777 goto out; 778 } 779 780 if (hdr->e_ident[EI_CLASS] != ELF_TARG_CLASS 781 || hdr->e_ident[EI_DATA] != ELF_TARG_DATA) { 782 link_elf_error(filename, "Unsupported file layout"); 783 error = ENOEXEC; 784 goto out; 785 } 786 if (hdr->e_ident[EI_VERSION] != EV_CURRENT 787 || hdr->e_version != EV_CURRENT) { 788 link_elf_error(filename, "Unsupported file version"); 789 error = ENOEXEC; 790 goto out; 791 } 792 if (hdr->e_type != ET_REL) { 793 error = ENOSYS; 794 goto out; 795 } 796 if (hdr->e_machine != ELF_TARG_MACH) { 797 link_elf_error(filename, "Unsupported machine"); 798 error = ENOEXEC; 799 goto out; 800 } 801 802 lf = linker_make_file(filename, &link_elf_class); 803 if (!lf) { 804 error = ENOMEM; 805 goto out; 806 } 807 ef = (elf_file_t) lf; 808 ef->nprogtab = 0; 809 ef->e_shdr = 0; 810 ef->nreltab = 0; 811 ef->nrelatab = 0; 812 813 /* Allocate and read in the section header */ 814 nbytes = hdr->e_shnum * hdr->e_shentsize; 815 if (nbytes == 0 || hdr->e_shoff == 0 || 816 hdr->e_shentsize != sizeof(Elf_Shdr)) { 817 error = ENOEXEC; 818 goto out; 819 } 820 shdr = malloc(nbytes, M_LINKER, M_WAITOK); 821 ef->e_shdr = shdr; 822 error = vn_rdwr(UIO_READ, nd->ni_vp, (caddr_t)shdr, nbytes, 823 hdr->e_shoff, UIO_SYSSPACE, IO_NODELOCKED, td->td_ucred, 824 NOCRED, &resid, td); 825 if (error) 826 goto out; 827 if (resid) { 828 error = ENOEXEC; 829 goto out; 830 } 831 832 /* Scan the section header for information and table sizing. */ 833 nsym = 0; 834 symtabindex = -1; 835 symstrindex = -1; 836 for (i = 0; i < hdr->e_shnum; i++) { 837 if (shdr[i].sh_size == 0) 838 continue; 839 switch (shdr[i].sh_type) { 840 case SHT_PROGBITS: 841 case SHT_NOBITS: 842 #ifdef __amd64__ 843 case SHT_X86_64_UNWIND: 844 #endif 845 case SHT_INIT_ARRAY: 846 case SHT_FINI_ARRAY: 847 if ((shdr[i].sh_flags & SHF_ALLOC) == 0) 848 break; 849 ef->nprogtab++; 850 break; 851 case SHT_SYMTAB: 852 nsym++; 853 symtabindex = i; 854 symstrindex = shdr[i].sh_link; 855 break; 856 case SHT_REL: 857 /* 858 * Ignore relocation tables for unallocated 859 * sections. 860 */ 861 if ((shdr[shdr[i].sh_info].sh_flags & SHF_ALLOC) == 0) 862 break; 863 ef->nreltab++; 864 break; 865 case SHT_RELA: 866 if ((shdr[shdr[i].sh_info].sh_flags & SHF_ALLOC) == 0) 867 break; 868 ef->nrelatab++; 869 break; 870 case SHT_STRTAB: 871 break; 872 } 873 } 874 if (ef->nprogtab == 0) { 875 link_elf_error(filename, "file has no contents"); 876 error = ENOEXEC; 877 goto out; 878 } 879 if (nsym != 1) { 880 /* Only allow one symbol table for now */ 881 link_elf_error(filename, 882 "file must have exactly one symbol table"); 883 error = ENOEXEC; 884 goto out; 885 } 886 if (symstrindex < 0 || symstrindex > hdr->e_shnum || 887 shdr[symstrindex].sh_type != SHT_STRTAB) { 888 link_elf_error(filename, "file has invalid symbol strings"); 889 error = ENOEXEC; 890 goto out; 891 } 892 893 /* Allocate space for tracking the load chunks */ 894 if (ef->nprogtab != 0) 895 ef->progtab = malloc(ef->nprogtab * sizeof(*ef->progtab), 896 M_LINKER, M_WAITOK | M_ZERO); 897 if (ef->nreltab != 0) 898 ef->reltab = malloc(ef->nreltab * sizeof(*ef->reltab), 899 M_LINKER, M_WAITOK | M_ZERO); 900 if (ef->nrelatab != 0) 901 ef->relatab = malloc(ef->nrelatab * sizeof(*ef->relatab), 902 M_LINKER, M_WAITOK | M_ZERO); 903 904 if (symtabindex == -1) { 905 link_elf_error(filename, "lost symbol table index"); 906 error = ENOEXEC; 907 goto out; 908 } 909 /* Allocate space for and load the symbol table */ 910 ef->ddbsymcnt = shdr[symtabindex].sh_size / sizeof(Elf_Sym); 911 ef->ddbsymtab = malloc(shdr[symtabindex].sh_size, M_LINKER, M_WAITOK); 912 error = vn_rdwr(UIO_READ, nd->ni_vp, (void *)ef->ddbsymtab, 913 shdr[symtabindex].sh_size, shdr[symtabindex].sh_offset, 914 UIO_SYSSPACE, IO_NODELOCKED, td->td_ucred, NOCRED, 915 &resid, td); 916 if (error) 917 goto out; 918 if (resid != 0){ 919 error = EINVAL; 920 goto out; 921 } 922 923 /* Allocate space for and load the symbol strings */ 924 ef->ddbstrcnt = shdr[symstrindex].sh_size; 925 ef->ddbstrtab = malloc(shdr[symstrindex].sh_size, M_LINKER, M_WAITOK); 926 error = vn_rdwr(UIO_READ, nd->ni_vp, ef->ddbstrtab, 927 shdr[symstrindex].sh_size, shdr[symstrindex].sh_offset, 928 UIO_SYSSPACE, IO_NODELOCKED, td->td_ucred, NOCRED, 929 &resid, td); 930 if (error) 931 goto out; 932 if (resid != 0){ 933 error = EINVAL; 934 goto out; 935 } 936 937 /* Do we have a string table for the section names? */ 938 shstrindex = -1; 939 if (hdr->e_shstrndx != 0 && 940 shdr[hdr->e_shstrndx].sh_type == SHT_STRTAB) { 941 shstrindex = hdr->e_shstrndx; 942 ef->shstrcnt = shdr[shstrindex].sh_size; 943 ef->shstrtab = malloc(shdr[shstrindex].sh_size, M_LINKER, 944 M_WAITOK); 945 error = vn_rdwr(UIO_READ, nd->ni_vp, ef->shstrtab, 946 shdr[shstrindex].sh_size, shdr[shstrindex].sh_offset, 947 UIO_SYSSPACE, IO_NODELOCKED, td->td_ucred, NOCRED, 948 &resid, td); 949 if (error) 950 goto out; 951 if (resid != 0){ 952 error = EINVAL; 953 goto out; 954 } 955 } 956 957 /* Size up code/data(progbits) and bss(nobits). */ 958 alignmask = 0; 959 for (i = 0; i < hdr->e_shnum; i++) { 960 if (shdr[i].sh_size == 0) 961 continue; 962 switch (shdr[i].sh_type) { 963 case SHT_PROGBITS: 964 case SHT_NOBITS: 965 #ifdef __amd64__ 966 case SHT_X86_64_UNWIND: 967 #endif 968 case SHT_INIT_ARRAY: 969 case SHT_FINI_ARRAY: 970 if ((shdr[i].sh_flags & SHF_ALLOC) == 0) 971 break; 972 alignmask = shdr[i].sh_addralign - 1; 973 mapsize += alignmask; 974 mapsize &= ~alignmask; 975 mapsize += shdr[i].sh_size; 976 break; 977 } 978 } 979 980 /* 981 * We know how much space we need for the text/data/bss/etc. 982 * This stuff needs to be in a single chunk so that profiling etc 983 * can get the bounds and gdb can associate offsets with modules 984 */ 985 ef->object = vm_pager_allocate(OBJT_PHYS, NULL, round_page(mapsize), 986 VM_PROT_ALL, 0, thread0.td_ucred); 987 if (ef->object == NULL) { 988 error = ENOMEM; 989 goto out; 990 } 991 #if VM_NRESERVLEVEL > 0 992 vm_object_color(ef->object, 0); 993 #endif 994 995 /* 996 * In order to satisfy amd64's architectural requirements on the 997 * location of code and data in the kernel's address space, request a 998 * mapping that is above the kernel. 999 * 1000 * Protections will be restricted once relocations are applied. 1001 */ 1002 #ifdef __amd64__ 1003 mapbase = KERNBASE; 1004 #else 1005 mapbase = VM_MIN_KERNEL_ADDRESS; 1006 #endif 1007 error = vm_map_find(kernel_map, ef->object, 0, &mapbase, 1008 round_page(mapsize), 0, VMFS_OPTIMAL_SPACE, VM_PROT_ALL, 1009 VM_PROT_ALL, 0); 1010 if (error != KERN_SUCCESS) { 1011 vm_object_deallocate(ef->object); 1012 ef->object = NULL; 1013 error = ENOMEM; 1014 goto out; 1015 } 1016 1017 /* Wire the pages */ 1018 error = vm_map_wire(kernel_map, mapbase, 1019 mapbase + round_page(mapsize), 1020 VM_MAP_WIRE_SYSTEM|VM_MAP_WIRE_NOHOLES); 1021 if (error != KERN_SUCCESS) { 1022 error = ENOMEM; 1023 goto out; 1024 } 1025 1026 /* Inform the kld system about the situation */ 1027 lf->address = ef->address = (caddr_t)mapbase; 1028 lf->size = mapsize; 1029 1030 /* 1031 * Now load code/data(progbits), zero bss(nobits), allocate space for 1032 * and load relocs 1033 */ 1034 pb = 0; 1035 rl = 0; 1036 ra = 0; 1037 alignmask = 0; 1038 for (i = 0; i < hdr->e_shnum; i++) { 1039 if (shdr[i].sh_size == 0) 1040 continue; 1041 switch (shdr[i].sh_type) { 1042 case SHT_PROGBITS: 1043 case SHT_NOBITS: 1044 #ifdef __amd64__ 1045 case SHT_X86_64_UNWIND: 1046 #endif 1047 case SHT_INIT_ARRAY: 1048 case SHT_FINI_ARRAY: 1049 if ((shdr[i].sh_flags & SHF_ALLOC) == 0) 1050 break; 1051 alignmask = shdr[i].sh_addralign - 1; 1052 mapbase += alignmask; 1053 mapbase &= ~alignmask; 1054 if (ef->shstrtab != NULL && shdr[i].sh_name != 0) { 1055 ef->progtab[pb].name = 1056 ef->shstrtab + shdr[i].sh_name; 1057 if (!strcmp(ef->progtab[pb].name, ".ctors") || 1058 shdr[i].sh_type == SHT_INIT_ARRAY) { 1059 if (lf->ctors_addr != 0) { 1060 printf( 1061 "%s: multiple ctor sections in %s\n", 1062 __func__, filename); 1063 } else { 1064 lf->ctors_addr = 1065 (caddr_t)mapbase; 1066 lf->ctors_size = 1067 shdr[i].sh_size; 1068 } 1069 } else if (!strcmp(ef->progtab[pb].name, 1070 ".dtors") || 1071 shdr[i].sh_type == SHT_FINI_ARRAY) { 1072 if (lf->dtors_addr != 0) { 1073 printf( 1074 "%s: multiple dtor sections in %s\n", 1075 __func__, filename); 1076 } else { 1077 lf->dtors_addr = 1078 (caddr_t)mapbase; 1079 lf->dtors_size = 1080 shdr[i].sh_size; 1081 } 1082 } 1083 } else if (shdr[i].sh_type == SHT_PROGBITS) 1084 ef->progtab[pb].name = "<<PROGBITS>>"; 1085 #ifdef __amd64__ 1086 else if (shdr[i].sh_type == SHT_X86_64_UNWIND) 1087 ef->progtab[pb].name = "<<UNWIND>>"; 1088 #endif 1089 else 1090 ef->progtab[pb].name = "<<NOBITS>>"; 1091 if (ef->progtab[pb].name != NULL && 1092 !strcmp(ef->progtab[pb].name, DPCPU_SETNAME)) { 1093 ef->progtab[pb].origaddr = 1094 (void *)(uintptr_t)mapbase; 1095 ef->progtab[pb].addr = 1096 dpcpu_alloc(shdr[i].sh_size); 1097 if (ef->progtab[pb].addr == NULL) { 1098 printf("%s: pcpu module space is out " 1099 "of space; cannot allocate %#jx " 1100 "for %s\n", __func__, 1101 (uintmax_t)shdr[i].sh_size, 1102 filename); 1103 } 1104 } 1105 #ifdef VIMAGE 1106 else if (ef->progtab[pb].name != NULL && 1107 !strcmp(ef->progtab[pb].name, VNET_SETNAME)) { 1108 ef->progtab[pb].origaddr = 1109 (void *)(uintptr_t)mapbase; 1110 ef->progtab[pb].addr = 1111 vnet_data_alloc(shdr[i].sh_size); 1112 if (ef->progtab[pb].addr == NULL) { 1113 printf("%s: vnet module space is out " 1114 "of space; cannot allocate %#jx " 1115 "for %s\n", __func__, 1116 (uintmax_t)shdr[i].sh_size, 1117 filename); 1118 } 1119 } 1120 #endif 1121 else 1122 ef->progtab[pb].addr = 1123 (void *)(uintptr_t)mapbase; 1124 if (ef->progtab[pb].addr == NULL) { 1125 error = ENOSPC; 1126 goto out; 1127 } 1128 ef->progtab[pb].size = shdr[i].sh_size; 1129 ef->progtab[pb].flags = shdr[i].sh_flags; 1130 ef->progtab[pb].sec = i; 1131 if (shdr[i].sh_type == SHT_PROGBITS 1132 #ifdef __amd64__ 1133 || shdr[i].sh_type == SHT_X86_64_UNWIND 1134 #endif 1135 ) { 1136 error = vn_rdwr(UIO_READ, nd->ni_vp, 1137 ef->progtab[pb].addr, 1138 shdr[i].sh_size, shdr[i].sh_offset, 1139 UIO_SYSSPACE, IO_NODELOCKED, td->td_ucred, 1140 NOCRED, &resid, td); 1141 if (error) 1142 goto out; 1143 if (resid != 0){ 1144 error = EINVAL; 1145 goto out; 1146 } 1147 /* Initialize the per-cpu area. */ 1148 if (ef->progtab[pb].addr != (void *)mapbase && 1149 !strcmp(ef->progtab[pb].name, DPCPU_SETNAME)) 1150 dpcpu_copy(ef->progtab[pb].addr, 1151 shdr[i].sh_size); 1152 } else 1153 bzero(ef->progtab[pb].addr, shdr[i].sh_size); 1154 1155 #ifdef VIMAGE 1156 if (ef->progtab[pb].addr != (void *)mapbase && 1157 strcmp(ef->progtab[pb].name, VNET_SETNAME) == 0) 1158 vnet_save_init(ef->progtab[pb].addr, 1159 ef->progtab[pb].size); 1160 #endif 1161 /* Update all symbol values with the offset. */ 1162 for (j = 0; j < ef->ddbsymcnt; j++) { 1163 es = &ef->ddbsymtab[j]; 1164 if (es->st_shndx != i) 1165 continue; 1166 es->st_value += (Elf_Addr)ef->progtab[pb].addr; 1167 } 1168 mapbase += shdr[i].sh_size; 1169 pb++; 1170 break; 1171 case SHT_REL: 1172 if ((shdr[shdr[i].sh_info].sh_flags & SHF_ALLOC) == 0) 1173 break; 1174 ef->reltab[rl].rel = malloc(shdr[i].sh_size, M_LINKER, 1175 M_WAITOK); 1176 ef->reltab[rl].nrel = shdr[i].sh_size / sizeof(Elf_Rel); 1177 ef->reltab[rl].sec = shdr[i].sh_info; 1178 error = vn_rdwr(UIO_READ, nd->ni_vp, 1179 (void *)ef->reltab[rl].rel, 1180 shdr[i].sh_size, shdr[i].sh_offset, 1181 UIO_SYSSPACE, IO_NODELOCKED, td->td_ucred, NOCRED, 1182 &resid, td); 1183 if (error) 1184 goto out; 1185 if (resid != 0){ 1186 error = EINVAL; 1187 goto out; 1188 } 1189 rl++; 1190 break; 1191 case SHT_RELA: 1192 if ((shdr[shdr[i].sh_info].sh_flags & SHF_ALLOC) == 0) 1193 break; 1194 ef->relatab[ra].rela = malloc(shdr[i].sh_size, M_LINKER, 1195 M_WAITOK); 1196 ef->relatab[ra].nrela = 1197 shdr[i].sh_size / sizeof(Elf_Rela); 1198 ef->relatab[ra].sec = shdr[i].sh_info; 1199 error = vn_rdwr(UIO_READ, nd->ni_vp, 1200 (void *)ef->relatab[ra].rela, 1201 shdr[i].sh_size, shdr[i].sh_offset, 1202 UIO_SYSSPACE, IO_NODELOCKED, td->td_ucred, NOCRED, 1203 &resid, td); 1204 if (error) 1205 goto out; 1206 if (resid != 0){ 1207 error = EINVAL; 1208 goto out; 1209 } 1210 ra++; 1211 break; 1212 } 1213 } 1214 if (pb != ef->nprogtab) { 1215 link_elf_error(filename, "lost progbits"); 1216 error = ENOEXEC; 1217 goto out; 1218 } 1219 if (rl != ef->nreltab) { 1220 link_elf_error(filename, "lost reltab"); 1221 error = ENOEXEC; 1222 goto out; 1223 } 1224 if (ra != ef->nrelatab) { 1225 link_elf_error(filename, "lost relatab"); 1226 error = ENOEXEC; 1227 goto out; 1228 } 1229 if (mapbase != (vm_offset_t)ef->address + mapsize) { 1230 printf( 1231 "%s: mapbase 0x%lx != address %p + mapsize 0x%lx (0x%lx)\n", 1232 filename != NULL ? filename : "<none>", 1233 (u_long)mapbase, ef->address, (u_long)mapsize, 1234 (u_long)(vm_offset_t)ef->address + mapsize); 1235 error = ENOMEM; 1236 goto out; 1237 } 1238 1239 /* Local intra-module relocations */ 1240 error = link_elf_reloc_local(lf, false); 1241 if (error != 0) 1242 goto out; 1243 1244 /* Pull in dependencies */ 1245 VOP_UNLOCK(nd->ni_vp); 1246 error = linker_load_dependencies(lf); 1247 vn_lock(nd->ni_vp, LK_EXCLUSIVE | LK_RETRY); 1248 if (error) 1249 goto out; 1250 1251 /* External relocations */ 1252 error = relocate_file(ef); 1253 if (error) 1254 goto out; 1255 1256 /* Notify MD code that a module is being loaded. */ 1257 error = elf_cpu_load_file(lf); 1258 if (error) 1259 goto out; 1260 1261 #if defined(__i386__) || defined(__amd64__) 1262 /* Now ifuncs. */ 1263 error = link_elf_reloc_local(lf, true); 1264 if (error != 0) 1265 goto out; 1266 #endif 1267 1268 link_elf_protect(ef); 1269 link_elf_invoke_ctors(lf); 1270 *result = lf; 1271 1272 out: 1273 VOP_UNLOCK(nd->ni_vp); 1274 vn_close(nd->ni_vp, FREAD, td->td_ucred, td); 1275 free(nd, M_TEMP); 1276 if (error && lf) 1277 linker_file_unload(lf, LINKER_UNLOAD_FORCE); 1278 free(hdr, M_LINKER); 1279 1280 return error; 1281 } 1282 1283 static void 1284 link_elf_unload_file(linker_file_t file) 1285 { 1286 elf_file_t ef = (elf_file_t) file; 1287 u_int i; 1288 1289 link_elf_invoke_dtors(file); 1290 1291 /* Notify MD code that a module is being unloaded. */ 1292 elf_cpu_unload_file(file); 1293 1294 if (ef->progtab) { 1295 for (i = 0; i < ef->nprogtab; i++) { 1296 if (ef->progtab[i].size == 0) 1297 continue; 1298 if (ef->progtab[i].name == NULL) 1299 continue; 1300 if (!strcmp(ef->progtab[i].name, DPCPU_SETNAME)) 1301 dpcpu_free(ef->progtab[i].addr, 1302 ef->progtab[i].size); 1303 #ifdef VIMAGE 1304 else if (!strcmp(ef->progtab[i].name, VNET_SETNAME)) 1305 vnet_data_free(ef->progtab[i].addr, 1306 ef->progtab[i].size); 1307 #endif 1308 } 1309 } 1310 if (ef->preloaded) { 1311 free(ef->reltab, M_LINKER); 1312 free(ef->relatab, M_LINKER); 1313 free(ef->progtab, M_LINKER); 1314 free(ef->ctftab, M_LINKER); 1315 free(ef->ctfoff, M_LINKER); 1316 free(ef->typoff, M_LINKER); 1317 if (file->pathname != NULL) 1318 preload_delete_name(file->pathname); 1319 return; 1320 } 1321 1322 for (i = 0; i < ef->nreltab; i++) 1323 free(ef->reltab[i].rel, M_LINKER); 1324 for (i = 0; i < ef->nrelatab; i++) 1325 free(ef->relatab[i].rela, M_LINKER); 1326 free(ef->reltab, M_LINKER); 1327 free(ef->relatab, M_LINKER); 1328 free(ef->progtab, M_LINKER); 1329 1330 if (ef->object != NULL) 1331 vm_map_remove(kernel_map, (vm_offset_t)ef->address, 1332 (vm_offset_t)ef->address + ptoa(ef->object->size)); 1333 free(ef->e_shdr, M_LINKER); 1334 free(ef->ddbsymtab, M_LINKER); 1335 free(ef->ddbstrtab, M_LINKER); 1336 free(ef->shstrtab, M_LINKER); 1337 free(ef->ctftab, M_LINKER); 1338 free(ef->ctfoff, M_LINKER); 1339 free(ef->typoff, M_LINKER); 1340 } 1341 1342 static const char * 1343 symbol_name(elf_file_t ef, Elf_Size r_info) 1344 { 1345 const Elf_Sym *ref; 1346 1347 if (ELF_R_SYM(r_info)) { 1348 ref = ef->ddbsymtab + ELF_R_SYM(r_info); 1349 return ef->ddbstrtab + ref->st_name; 1350 } else 1351 return NULL; 1352 } 1353 1354 static Elf_Addr 1355 findbase(elf_file_t ef, int sec) 1356 { 1357 int i; 1358 Elf_Addr base = 0; 1359 1360 for (i = 0; i < ef->nprogtab; i++) { 1361 if (sec == ef->progtab[i].sec) { 1362 base = (Elf_Addr)ef->progtab[i].addr; 1363 break; 1364 } 1365 } 1366 return base; 1367 } 1368 1369 static int 1370 relocate_file1(elf_file_t ef, bool ifuncs) 1371 { 1372 const Elf_Rel *rellim; 1373 const Elf_Rel *rel; 1374 const Elf_Rela *relalim; 1375 const Elf_Rela *rela; 1376 const char *symname; 1377 const Elf_Sym *sym; 1378 int i; 1379 Elf_Size symidx; 1380 Elf_Addr base; 1381 1382 /* Perform relocations without addend if there are any: */ 1383 for (i = 0; i < ef->nreltab; i++) { 1384 rel = ef->reltab[i].rel; 1385 if (rel == NULL) { 1386 link_elf_error(ef->lf.filename, "lost a reltab!"); 1387 return (ENOEXEC); 1388 } 1389 rellim = rel + ef->reltab[i].nrel; 1390 base = findbase(ef, ef->reltab[i].sec); 1391 if (base == 0) { 1392 link_elf_error(ef->lf.filename, "lost base for reltab"); 1393 return (ENOEXEC); 1394 } 1395 for ( ; rel < rellim; rel++) { 1396 symidx = ELF_R_SYM(rel->r_info); 1397 if (symidx >= ef->ddbsymcnt) 1398 continue; 1399 sym = ef->ddbsymtab + symidx; 1400 /* Local relocs are already done */ 1401 if (ELF_ST_BIND(sym->st_info) == STB_LOCAL) 1402 continue; 1403 if ((ELF_ST_TYPE(sym->st_info) == STT_GNU_IFUNC || 1404 elf_is_ifunc_reloc(rel->r_info)) != ifuncs) 1405 continue; 1406 if (elf_reloc(&ef->lf, base, rel, ELF_RELOC_REL, 1407 elf_obj_lookup)) { 1408 symname = symbol_name(ef, rel->r_info); 1409 printf("link_elf_obj: symbol %s undefined\n", 1410 symname); 1411 return (ENOENT); 1412 } 1413 } 1414 } 1415 1416 /* Perform relocations with addend if there are any: */ 1417 for (i = 0; i < ef->nrelatab; i++) { 1418 rela = ef->relatab[i].rela; 1419 if (rela == NULL) { 1420 link_elf_error(ef->lf.filename, "lost a relatab!"); 1421 return (ENOEXEC); 1422 } 1423 relalim = rela + ef->relatab[i].nrela; 1424 base = findbase(ef, ef->relatab[i].sec); 1425 if (base == 0) { 1426 link_elf_error(ef->lf.filename, 1427 "lost base for relatab"); 1428 return (ENOEXEC); 1429 } 1430 for ( ; rela < relalim; rela++) { 1431 symidx = ELF_R_SYM(rela->r_info); 1432 if (symidx >= ef->ddbsymcnt) 1433 continue; 1434 sym = ef->ddbsymtab + symidx; 1435 /* Local relocs are already done */ 1436 if (ELF_ST_BIND(sym->st_info) == STB_LOCAL) 1437 continue; 1438 if ((ELF_ST_TYPE(sym->st_info) == STT_GNU_IFUNC || 1439 elf_is_ifunc_reloc(rela->r_info)) != ifuncs) 1440 continue; 1441 if (elf_reloc(&ef->lf, base, rela, ELF_RELOC_RELA, 1442 elf_obj_lookup)) { 1443 symname = symbol_name(ef, rela->r_info); 1444 printf("link_elf_obj: symbol %s undefined\n", 1445 symname); 1446 return (ENOENT); 1447 } 1448 } 1449 } 1450 1451 /* 1452 * Only clean SHN_FBSD_CACHED for successful return. If we 1453 * modified symbol table for the object but found an 1454 * unresolved symbol, there is no reason to roll back. 1455 */ 1456 elf_obj_cleanup_globals_cache(ef); 1457 1458 return (0); 1459 } 1460 1461 static int 1462 relocate_file(elf_file_t ef) 1463 { 1464 int error; 1465 1466 error = relocate_file1(ef, false); 1467 if (error == 0) 1468 error = relocate_file1(ef, true); 1469 return (error); 1470 } 1471 1472 static int 1473 link_elf_lookup_symbol1(linker_file_t lf, const char *name, c_linker_sym_t *sym, 1474 bool see_local) 1475 { 1476 elf_file_t ef = (elf_file_t)lf; 1477 const Elf_Sym *symp; 1478 const char *strp; 1479 int i; 1480 1481 for (i = 0, symp = ef->ddbsymtab; i < ef->ddbsymcnt; i++, symp++) { 1482 strp = ef->ddbstrtab + symp->st_name; 1483 if (symp->st_shndx != SHN_UNDEF && strcmp(name, strp) == 0) { 1484 if (see_local || 1485 ELF_ST_BIND(symp->st_info) == STB_GLOBAL) { 1486 *sym = (c_linker_sym_t) symp; 1487 return (0); 1488 } 1489 return (ENOENT); 1490 } 1491 } 1492 return (ENOENT); 1493 } 1494 1495 static int 1496 link_elf_lookup_symbol(linker_file_t lf, const char *name, c_linker_sym_t *sym) 1497 { 1498 return (link_elf_lookup_symbol1(lf, name, sym, 1499 link_elf_obj_leak_locals)); 1500 } 1501 1502 static int 1503 link_elf_lookup_debug_symbol(linker_file_t lf, const char *name, 1504 c_linker_sym_t *sym) 1505 { 1506 return (link_elf_lookup_symbol1(lf, name, sym, true)); 1507 } 1508 1509 static int 1510 link_elf_lookup_debug_symbol_ctf(linker_file_t lf, const char *name, 1511 c_linker_sym_t *sym, linker_ctf_t *lc) 1512 { 1513 if (link_elf_lookup_debug_symbol(lf, name, sym)) 1514 return (ENOENT); 1515 1516 return (link_elf_ctf_get_ddb(lf, lc)); 1517 } 1518 1519 static void 1520 link_elf_ifunc_symbol_value(linker_file_t lf, caddr_t *valp, size_t *sizep) 1521 { 1522 c_linker_sym_t sym; 1523 const Elf_Sym *es; 1524 caddr_t val; 1525 long off; 1526 1527 val = *valp; 1528 1529 /* Provide the value and size of the target symbol, if available. */ 1530 val = ((caddr_t (*)(void))val)(); 1531 if (link_elf_search_symbol(lf, val, &sym, &off) == 0 && off == 0) { 1532 es = (const Elf_Sym *)sym; 1533 *valp = (caddr_t)es->st_value; 1534 *sizep = es->st_size; 1535 } else { 1536 *valp = val; 1537 *sizep = 0; 1538 } 1539 } 1540 1541 static int 1542 link_elf_symbol_values1(linker_file_t lf, c_linker_sym_t sym, 1543 linker_symval_t *symval, bool see_local) 1544 { 1545 elf_file_t ef; 1546 const Elf_Sym *es; 1547 caddr_t val; 1548 size_t size; 1549 1550 ef = (elf_file_t) lf; 1551 es = (const Elf_Sym*) sym; 1552 val = (caddr_t)es->st_value; 1553 if (es >= ef->ddbsymtab && es < (ef->ddbsymtab + ef->ddbsymcnt)) { 1554 if (!see_local && ELF_ST_BIND(es->st_info) == STB_LOCAL) 1555 return (ENOENT); 1556 symval->name = ef->ddbstrtab + es->st_name; 1557 val = (caddr_t)es->st_value; 1558 if (ELF_ST_TYPE(es->st_info) == STT_GNU_IFUNC) 1559 link_elf_ifunc_symbol_value(lf, &val, &size); 1560 else 1561 size = es->st_size; 1562 symval->value = val; 1563 symval->size = size; 1564 return (0); 1565 } 1566 return (ENOENT); 1567 } 1568 1569 static int 1570 link_elf_symbol_values(linker_file_t lf, c_linker_sym_t sym, 1571 linker_symval_t *symval) 1572 { 1573 return (link_elf_symbol_values1(lf, sym, symval, 1574 link_elf_obj_leak_locals)); 1575 } 1576 1577 static int 1578 link_elf_debug_symbol_values(linker_file_t lf, c_linker_sym_t sym, 1579 linker_symval_t *symval) 1580 { 1581 return (link_elf_symbol_values1(lf, sym, symval, true)); 1582 } 1583 1584 static int 1585 link_elf_search_symbol(linker_file_t lf, caddr_t value, 1586 c_linker_sym_t *sym, long *diffp) 1587 { 1588 elf_file_t ef = (elf_file_t)lf; 1589 u_long off = (uintptr_t)(void *)value; 1590 u_long diff = off; 1591 u_long st_value; 1592 const Elf_Sym *es; 1593 const Elf_Sym *best = NULL; 1594 int i; 1595 1596 for (i = 0, es = ef->ddbsymtab; i < ef->ddbsymcnt; i++, es++) { 1597 if (es->st_name == 0) 1598 continue; 1599 st_value = es->st_value; 1600 if (off >= st_value) { 1601 if (off - st_value < diff) { 1602 diff = off - st_value; 1603 best = es; 1604 if (diff == 0) 1605 break; 1606 } else if (off - st_value == diff) { 1607 best = es; 1608 } 1609 } 1610 } 1611 if (best == NULL) 1612 *diffp = off; 1613 else 1614 *diffp = diff; 1615 *sym = (c_linker_sym_t) best; 1616 1617 return (0); 1618 } 1619 1620 /* 1621 * Look up a linker set on an ELF system. 1622 */ 1623 static int 1624 link_elf_lookup_set(linker_file_t lf, const char *name, 1625 void ***startp, void ***stopp, int *countp) 1626 { 1627 elf_file_t ef = (elf_file_t)lf; 1628 void **start, **stop; 1629 int i, count; 1630 1631 /* Relative to section number */ 1632 for (i = 0; i < ef->nprogtab; i++) { 1633 if ((strncmp(ef->progtab[i].name, "set_", 4) == 0) && 1634 strcmp(ef->progtab[i].name + 4, name) == 0) { 1635 start = (void **)ef->progtab[i].addr; 1636 stop = (void **)((char *)ef->progtab[i].addr + 1637 ef->progtab[i].size); 1638 count = stop - start; 1639 if (startp) 1640 *startp = start; 1641 if (stopp) 1642 *stopp = stop; 1643 if (countp) 1644 *countp = count; 1645 return (0); 1646 } 1647 } 1648 return (ESRCH); 1649 } 1650 1651 static int 1652 link_elf_each_function_name(linker_file_t file, 1653 int (*callback)(const char *, void *), void *opaque) 1654 { 1655 elf_file_t ef = (elf_file_t)file; 1656 const Elf_Sym *symp; 1657 int i, error; 1658 1659 /* Exhaustive search */ 1660 for (i = 0, symp = ef->ddbsymtab; i < ef->ddbsymcnt; i++, symp++) { 1661 if (symp->st_value != 0 && 1662 (ELF_ST_TYPE(symp->st_info) == STT_FUNC || 1663 ELF_ST_TYPE(symp->st_info) == STT_GNU_IFUNC)) { 1664 error = callback(ef->ddbstrtab + symp->st_name, opaque); 1665 if (error) 1666 return (error); 1667 } 1668 } 1669 return (0); 1670 } 1671 1672 static int 1673 link_elf_each_function_nameval(linker_file_t file, 1674 linker_function_nameval_callback_t callback, void *opaque) 1675 { 1676 linker_symval_t symval; 1677 elf_file_t ef = (elf_file_t)file; 1678 const Elf_Sym *symp; 1679 int i, error; 1680 1681 /* Exhaustive search */ 1682 for (i = 0, symp = ef->ddbsymtab; i < ef->ddbsymcnt; i++, symp++) { 1683 if (symp->st_value != 0 && 1684 (ELF_ST_TYPE(symp->st_info) == STT_FUNC || 1685 ELF_ST_TYPE(symp->st_info) == STT_GNU_IFUNC)) { 1686 error = link_elf_debug_symbol_values(file, 1687 (c_linker_sym_t)symp, &symval); 1688 if (error == 0) 1689 error = callback(file, i, &symval, opaque); 1690 if (error != 0) 1691 return (error); 1692 } 1693 } 1694 return (0); 1695 } 1696 1697 static void 1698 elf_obj_cleanup_globals_cache(elf_file_t ef) 1699 { 1700 Elf_Sym *sym; 1701 Elf_Size i; 1702 1703 for (i = 0; i < ef->ddbsymcnt; i++) { 1704 sym = ef->ddbsymtab + i; 1705 if (sym->st_shndx == SHN_FBSD_CACHED) { 1706 sym->st_shndx = SHN_UNDEF; 1707 sym->st_value = 0; 1708 } 1709 } 1710 } 1711 1712 /* 1713 * Symbol lookup function that can be used when the symbol index is known (ie 1714 * in relocations). It uses the symbol index instead of doing a fully fledged 1715 * hash table based lookup when such is valid. For example for local symbols. 1716 * This is not only more efficient, it's also more correct. It's not always 1717 * the case that the symbol can be found through the hash table. 1718 */ 1719 static int 1720 elf_obj_lookup(linker_file_t lf, Elf_Size symidx, int deps, Elf_Addr *res) 1721 { 1722 elf_file_t ef = (elf_file_t)lf; 1723 Elf_Sym *sym; 1724 const char *symbol; 1725 Elf_Addr res1; 1726 1727 /* Don't even try to lookup the symbol if the index is bogus. */ 1728 if (symidx >= ef->ddbsymcnt) { 1729 *res = 0; 1730 return (EINVAL); 1731 } 1732 1733 sym = ef->ddbsymtab + symidx; 1734 1735 /* Quick answer if there is a definition included. */ 1736 if (sym->st_shndx != SHN_UNDEF) { 1737 res1 = (Elf_Addr)sym->st_value; 1738 if (ELF_ST_TYPE(sym->st_info) == STT_GNU_IFUNC) 1739 res1 = ((Elf_Addr (*)(void))res1)(); 1740 *res = res1; 1741 return (0); 1742 } 1743 1744 /* If we get here, then it is undefined and needs a lookup. */ 1745 switch (ELF_ST_BIND(sym->st_info)) { 1746 case STB_LOCAL: 1747 /* Local, but undefined? huh? */ 1748 *res = 0; 1749 return (EINVAL); 1750 1751 case STB_GLOBAL: 1752 case STB_WEAK: 1753 /* Relative to Data or Function name */ 1754 symbol = ef->ddbstrtab + sym->st_name; 1755 1756 /* Force a lookup failure if the symbol name is bogus. */ 1757 if (*symbol == 0) { 1758 *res = 0; 1759 return (EINVAL); 1760 } 1761 res1 = (Elf_Addr)linker_file_lookup_symbol(lf, symbol, deps); 1762 1763 /* 1764 * Cache global lookups during module relocation. The failure 1765 * case is particularly expensive for callers, who must scan 1766 * through the entire globals table doing strcmp(). Cache to 1767 * avoid doing such work repeatedly. 1768 * 1769 * After relocation is complete, undefined globals will be 1770 * restored to SHN_UNDEF in elf_obj_cleanup_globals_cache(), 1771 * above. 1772 */ 1773 if (res1 != 0) { 1774 sym->st_shndx = SHN_FBSD_CACHED; 1775 sym->st_value = res1; 1776 *res = res1; 1777 return (0); 1778 } else if (ELF_ST_BIND(sym->st_info) == STB_WEAK) { 1779 sym->st_value = 0; 1780 *res = 0; 1781 return (0); 1782 } 1783 return (EINVAL); 1784 1785 default: 1786 return (EINVAL); 1787 } 1788 } 1789 1790 static void 1791 link_elf_fix_link_set(elf_file_t ef) 1792 { 1793 static const char startn[] = "__start_"; 1794 static const char stopn[] = "__stop_"; 1795 Elf_Sym *sym; 1796 const char *sym_name, *linkset_name; 1797 Elf_Addr startp, stopp; 1798 Elf_Size symidx; 1799 int start, i; 1800 1801 startp = stopp = 0; 1802 for (symidx = 1 /* zero entry is special */; 1803 symidx < ef->ddbsymcnt; symidx++) { 1804 sym = ef->ddbsymtab + symidx; 1805 if (sym->st_shndx != SHN_UNDEF) 1806 continue; 1807 1808 sym_name = ef->ddbstrtab + sym->st_name; 1809 if (strncmp(sym_name, startn, sizeof(startn) - 1) == 0) { 1810 start = 1; 1811 linkset_name = sym_name + sizeof(startn) - 1; 1812 } 1813 else if (strncmp(sym_name, stopn, sizeof(stopn) - 1) == 0) { 1814 start = 0; 1815 linkset_name = sym_name + sizeof(stopn) - 1; 1816 } 1817 else 1818 continue; 1819 1820 for (i = 0; i < ef->nprogtab; i++) { 1821 if (strcmp(ef->progtab[i].name, linkset_name) == 0) { 1822 startp = (Elf_Addr)ef->progtab[i].addr; 1823 stopp = (Elf_Addr)(startp + ef->progtab[i].size); 1824 break; 1825 } 1826 } 1827 if (i == ef->nprogtab) 1828 continue; 1829 1830 sym->st_value = start ? startp : stopp; 1831 sym->st_shndx = i; 1832 } 1833 } 1834 1835 static int 1836 link_elf_reloc_local(linker_file_t lf, bool ifuncs) 1837 { 1838 elf_file_t ef = (elf_file_t)lf; 1839 const Elf_Rel *rellim; 1840 const Elf_Rel *rel; 1841 const Elf_Rela *relalim; 1842 const Elf_Rela *rela; 1843 const Elf_Sym *sym; 1844 Elf_Addr base; 1845 int i; 1846 Elf_Size symidx; 1847 1848 link_elf_fix_link_set(ef); 1849 1850 /* Perform relocations without addend if there are any: */ 1851 for (i = 0; i < ef->nreltab; i++) { 1852 rel = ef->reltab[i].rel; 1853 if (rel == NULL) { 1854 link_elf_error(ef->lf.filename, "lost a reltab"); 1855 return (ENOEXEC); 1856 } 1857 rellim = rel + ef->reltab[i].nrel; 1858 base = findbase(ef, ef->reltab[i].sec); 1859 if (base == 0) { 1860 link_elf_error(ef->lf.filename, "lost base for reltab"); 1861 return (ENOEXEC); 1862 } 1863 for ( ; rel < rellim; rel++) { 1864 symidx = ELF_R_SYM(rel->r_info); 1865 if (symidx >= ef->ddbsymcnt) 1866 continue; 1867 sym = ef->ddbsymtab + symidx; 1868 /* Only do local relocs */ 1869 if (ELF_ST_BIND(sym->st_info) != STB_LOCAL) 1870 continue; 1871 if ((ELF_ST_TYPE(sym->st_info) == STT_GNU_IFUNC || 1872 elf_is_ifunc_reloc(rel->r_info)) != ifuncs) 1873 continue; 1874 if (elf_reloc_local(lf, base, rel, ELF_RELOC_REL, 1875 elf_obj_lookup) != 0) 1876 return (ENOEXEC); 1877 } 1878 } 1879 1880 /* Perform relocations with addend if there are any: */ 1881 for (i = 0; i < ef->nrelatab; i++) { 1882 rela = ef->relatab[i].rela; 1883 if (rela == NULL) { 1884 link_elf_error(ef->lf.filename, "lost a relatab!"); 1885 return (ENOEXEC); 1886 } 1887 relalim = rela + ef->relatab[i].nrela; 1888 base = findbase(ef, ef->relatab[i].sec); 1889 if (base == 0) { 1890 link_elf_error(ef->lf.filename, "lost base for reltab"); 1891 return (ENOEXEC); 1892 } 1893 for ( ; rela < relalim; rela++) { 1894 symidx = ELF_R_SYM(rela->r_info); 1895 if (symidx >= ef->ddbsymcnt) 1896 continue; 1897 sym = ef->ddbsymtab + symidx; 1898 /* Only do local relocs */ 1899 if (ELF_ST_BIND(sym->st_info) != STB_LOCAL) 1900 continue; 1901 if ((ELF_ST_TYPE(sym->st_info) == STT_GNU_IFUNC || 1902 elf_is_ifunc_reloc(rela->r_info)) != ifuncs) 1903 continue; 1904 if (elf_reloc_local(lf, base, rela, ELF_RELOC_RELA, 1905 elf_obj_lookup) != 0) 1906 return (ENOEXEC); 1907 } 1908 } 1909 return (0); 1910 } 1911 1912 static long 1913 link_elf_symtab_get(linker_file_t lf, const Elf_Sym **symtab) 1914 { 1915 elf_file_t ef = (elf_file_t)lf; 1916 1917 *symtab = ef->ddbsymtab; 1918 if (*symtab == NULL) 1919 return (0); 1920 return (ef->ddbsymcnt); 1921 } 1922 1923 static long 1924 link_elf_strtab_get(linker_file_t lf, caddr_t *strtab) 1925 { 1926 elf_file_t ef = (elf_file_t)lf; 1927 1928 *strtab = ef->ddbstrtab; 1929 if (*strtab == NULL) 1930 return (0); 1931 return (ef->ddbstrcnt); 1932 } 1933 1934 #ifdef VIMAGE 1935 static void 1936 link_elf_propagate_vnets(linker_file_t lf) 1937 { 1938 elf_file_t ef = (elf_file_t) lf; 1939 1940 if (ef->progtab) { 1941 for (int i = 0; i < ef->nprogtab; i++) { 1942 if (ef->progtab[i].size == 0) 1943 continue; 1944 if (ef->progtab[i].name == NULL) 1945 continue; 1946 if (strcmp(ef->progtab[i].name, VNET_SETNAME) == 0) { 1947 vnet_data_copy(ef->progtab[i].addr, 1948 ef->progtab[i].size); 1949 break; 1950 } 1951 } 1952 } 1953 } 1954 #endif 1955