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