The Design and Implementation of the FreeBSD Operating System, Second Edition
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FreeBSD/Linux Kernel Cross Reference
sys/kern/link_elf_obj.c

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

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