sys/kern/link_elf_obj.c

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