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